Updated .gitignore

.gitignore

@@ -1 +1,2 @@
 .vscode/
+__pycache__/

CHANGELOG.md

@@ -0,0 +1,144 @@
+# SLS Changelog
+
+## 0.0.2-alpha
+*08 Dec 2025*
+
+- Added Rust Port
+- Added Interpreter State Serialization to Rust port
+    - Added `#load <file>` and `#save <file>` directives to the REPL
+- Added Python Port
+- Added Calculator app
+    - Added sls_py.calc module
+- Added RP2040 build target for the C implementation
+
+## 0.0.1-alpha
+*01 Dec 2025*
+
+- Added executing a file
+- Implemented the following builtin operators:
+    - `for`
+    - `logb`
+    - `max`
+    - `min`
+    - `rot`
+    - `const`
+    - `atan2`
+    - `roll`
+    - `while`
+    - `type_of`
+    - `eval`
+    - `lambda`
+    - `if`
+    - `pick`
+    - `dup`
+    - bitwise `and`
+    - bitwise `not`
+    - bitwise `or`
+    - bitwise `xor`
+    - boolean `and`
+    - boolean `not`
+    - boolean `or`
+    - `shl`
+    - `shr`
+    - comparisons
+    - `ceil`
+    - `floor`
+    - `round`
+    - `swap`
+    - `seed`
+    - `rand`
+    - `acos`
+    - `asin`
+    - `atan`
+    - `cos`
+    - `ln`
+    - `log`
+    - `sin`
+    - `sqrt`
+    - `tan`
+    - `abs`
+    - modulus
+    - exponential
+    - addition
+    - subtraction
+    - multiplication
+
+## SE Checkpoint 3
+*28 Nov 2025*
+
+[github.com/SnowSE/final-project-KylerOlsen](https://github.com/SnowSE/final-project-KylerOlsen)
+
+[Compare SE3250-Checkpoint2..SE3250-Checkpoint3](https://github.com/SnowSE/final-project-KylerOlsen/compare/SE3250-Checkpoint2...SE3250-Checkpoint3)
+
+**Report**:
+
+Since checkpoint 2, I completed `token string` parsing and started working on
+the REPL. The lexer and REPL are basically finished as much as I am going to do
+for this assignment. I did start to implement builtin functions and operators.
+Currently only
+[`depth`](https://sls.purplecello.org/complete_operator_reference.html#depth),
+[`drop`](https://sls.purplecello.org/complete_operator_reference.html#drop), and
+[`/`](https://sls.purplecello.org/complete_operator_reference.html#_5)
+
+**Plan**:
+
+By the final turn-in on December 6th, I plan on getting all arithmetic
+operations working. And the python and rust ports with help from AI.
+
+**Stuck**:
+
+I'm not really stuck on anything, but I am running out of time, plus I am
+worried about not having enough AI usage to do the ports. If I at least get the
+main structures of the ports, I hope it will be enough for me to finish.
+
+## SE Checkpoint 2
+*20 Nov 2025*
+
+[github.com/SnowSE/final-project-KylerOlsen](https://github.com/SnowSE/final-project-KylerOlsen)
+
+[Compare SE3250-Checkpoint1..SE3250-Checkpoint2](https://github.com/SnowSE/final-project-KylerOlsen/compare/SE3250-Checkpoint1...SE3250-Checkpoint2)
+
+**Report**:
+
+I completed my string type for the interpreter. `floats`, `characters`,
+`identifiers`, and `boolean` token lexing has been completed. `integer` tokens
+were working at checkpoint 1.
+
+**Plan**:
+
+By checkpoint 3 I plan to complete `token string` token parsing and basic
+arithmetic execution.
+
+**Stuck**:
+
+I'm not really stuck on anything, but I have been dropping things from the scope
+of this assignment. I do hope to add them when I have time in the future. These
+features moved to the backlog include:
+
+- Unicode support
+- Exponential literals
+- Arrays and array functions
+- Type tuples, function defs
+- Structs, unions, etc.
+
+## SE Checkpoint 1
+*07 Nov 2025*
+
+**intended user**:  
+Programmers
+
+**detailed functional requirements**:  
+A stack based language interpreter inspired by RPL, C, Rust, and Uiua
+([sls.purplecello.org](https://sls.purplecello.org))
+
+**motivation for wanting to work on the project**:  
+It is cool, and I have had this idea for a while and learning new languages this
+semester has given me more ideas and motivation for this.
+
+**motivation for language selection**:  
+C is a lower level language that can run on embedded systems and is well suited
+for writing language interpreters like Python and Lua.
+
+**non-functional requirements / constraints**:  
+Efficient enough for use on a modern micro controller
+(ie. Raspberry Pi Pico, ESP32)

README.md

@@ -1,97 +1,128 @@
 # YREA SLS
 *Kyler Olsen*  
 *October 2025*
-*Snow College*  
-*SE 3250 Survey of Languages Final Project*
 
-Language Code Name: YREA **SLS** (*Stack Language Specification*)  
-Language Specifications: [sls.purplecello.org](https://sls.purplecello.org)  
-Language Specification Repository (Private): [git.purplecello.org](https://git.purplecello.org/KylerOlsen/LangsFinalPlaning)  
-Language Implementation Repository (Private): [git.purplecello.org](https://git.purplecello.org/KylerOlsen/YREA-SLS)  
-Language Implementation Repository (Mirror on GitHub) (Private): [github.com](https://github.com/SnowSE/final-project-KylerOlsen)  
-Assignment Page (Private): [snow.instructure.com](https://snow.instructure.com/courses/1154808/assignments/16233203)
+SLS is a statically-typed, stack-based language with pure postfix notation
+combining the execution model of HP's RPL, the type system of C and Rust, and
+modern array operations from Uiua.
 
-## Assignment Description
+## Build Commands
 
-**Overview**
+**Linux**
 
-In your final project for this course, you will do the following:
+C
+```bash
+cd SLS_C
+python3 build.py build
+./bin/sls
+```
 
-- Decide on a modest personal project to complete in a new-to-you
-programming language (during class time, we will randomize the list of
-people in the class and allow languages to be selected uniquely on a
-first-come, first-served basis; be prepared to pick the language you want
-and to advocate for the languages that you don't want).
-- Without using AI generated or suggested code, complete your project in
-your assigned language including automated testing. Find a way to make your
-useful implementation concise and elegant enough that you would be able to
-recreate it reasonably quickly without AI assistance (be prepared to
-demonstrate this ability during a one-on-one interview to ensure credit).
-- Using AI help as desired, create a faithful port of your implementation
-(including tests) to:
-    - Rust
-    - Python
-    - Java (optional, but it might be interesting and userful for your
-    resume)
-    - C# (optional, but it might be interesting)
-    - typescript (optional, but it might be interesting)
-- For each ported implementation, add one addition feature (not present in
-the original or other ports).
-- Prepare a report that describes:
-    - the problem that your project solves and why you are interested in it
-    - a brief description of how the language that you chose and the port
-    languages were or were not each a good fit for the project
-    - three examples of ideas you learned in the course that you leveraged
-    to the implementation in your assigned language elegant, efficient, and
-    concise/maintainable (at least one idea should specifically come from
-    functional programming) -- make sure to be specific and teach the reader
-    something valuable for each of these
-    - at least one struggle that you faced (or that you imagine that others
-    would likely face) for each language implementation, and what you
-    learned from working with the port languages during the porting process.
-- Prepare slides that help you teach the key ideas from your report to the
-class.
-- In a 5-8 minute presentation during the final exam slot, use your slides
-to teach the class and demonstrate your running project including the
-addition port features.
+Python run module
+```bash
+cd SLS_Python
+python3 -m sls_py
+python3 -m sls_py.calc
+```
 
-Project Scope
+Python Setup
+```bash
+cd SLS_Python
+python -m venv .venv
+source .venv/bin/activate
+pip install build wheel "setuptools>=61.0"
+pip install -e sls_build_backend
+```
 
-- Please do something that will be fun and interesting for you!
-- Make sure that the project actually solves a problem that you care about.
-(Entertainment counts, but if that is the problem you care about, then make
-sure that you can make something that actually is entertaining!)
-- I'm expecting you to dedicate about 15-30 hours to the entire project
-(including all three implementations and the report/presentation
-preparation). I'm expecting that your initial implmentation should feel
-like about twice the scope of implementing the game of life in PostScript
-or K.
+Python build module
+```bash
+cd SLS_Python
+source .venv/bin/activate
+python3 -m build --no-isolation
+pip install ./dist/sls_python-0.0.2a0-py3-none-any.whl
+python3 -m sls_py
+python3 -m sls_py.calc
+```
 
-**Languages**
+Rust
+```bash
+cd SLS_Rust/sls
+cargo build
+./target/debug/sls_rs
+```
 
-For what it is worth, here are a few resources that rank or compare different
-programming languages in terms of popularity or jobs (but they don't equally
-capture how programming in the languages will give you tools for thinking
-about and solving problems):
+**Windows**
 
-- https://spectrum.ieee.org/top-programming-languages-2025 
-- https://www.tiobe.com/tiobe-index/
-- https://survey.stackoverflow.co/2025/technology#admired-and-desired
-- https://survey.stackoverflow.co/2025/technology#most-popular-technologies-language-prof
-- https://tjpalmer.github.io/languish/
-- https://www.geeksforgeeks.org/blogs/top-programming-languages/
-- https://github.com/breck7/pldb
+C (Using Visual Studio Developer PowerShell)
+```shell
+cd SLS_C
+python build.py build
+.\bin\sls.exe
+```
 
-Here is the list of programming languages that you will be able to choose from
-for your initial implementation (each language will be chosen by at most one
-student; we will choose during class time on Oct 27):
+Python run module
+```bat
+cd SLS_Python
+python -m sls_py
+python -m sls_py.calc
+```
 
-- **C** Kyler
+Python Setup
+```bat
+cd SLS_Python
+python -m venv .venv
+.venv\Scripts\activate.bat
+pip install build wheel "setuptools>=61.0"
+pip install -e sls_build_backend
+```
 
-**Submission**
+Python build module
+```bat
+cd SLS_Python
+.venv\Scripts\activate.bat
+python -m build --no-isolation
+pip install .\dist\sls_python-0.0.2a0-py3-none-any.whl
+python -m sls_py
+python -m sls_py.calc
+```
 
-Submit all material (including report and slides) via github classrooms repo.
-Also, submit your github repo link and the path to the report and slides file
-in the canvas text box for this assignment. The grace period for submission
-ends at 3pm on Monday, Dec 8. Presentations will be 3:30pm - 5:30pm. For full
-credit, you must present and watch the presentations of your classmates.
+Rust
+```bat
+cd SLS_Rust\sls
+cargo build
+.\target\debug\sls_rs.exe
+```
+
+**MacOS**
+
+Reference Linux build instructions.
+
+For C there is the `python3 build.py macos` command, but it is untested as I
+didn't test it on a Mac. I also don't know if `python3 build.py build` would also
+work on a Mac.
+
+Python and Rust should just be the same or similar to Linux.
+
+**RP2040**
+
+Only tested on Linux. Only SLS_C supports RP2040.
+
+Install Pico SDK to `~/pico/pico-sdk`, or set environment variable
+`PICO_SDK_PATH` to your installation path. You will also need to install the
+appropriate compiler.
+
+Debian GNU/Linux
+```bash
+sudo apt install gcc-arm-none-eabi
+```
+
+```shell
+cd SLS_C
+python3 build.py rp2040
+```
+
+Flash Raspberry Pi Pico:  
+Copy `.\build_pico\sls.elf.uf2` to your Pico in BOOTSEL mode
+
+## Contributing
+
+[sls.purplecello.org/contributing](https://sls.purplecello.org/contributing.html)

REPORT.md

@@ -0,0 +1,92 @@
+# YREA SLS
+*Kyler Olsen*  
+*October-December 2025*  
+*Snow College*  
+*SE 3250*  
+*Survey of Languages*  
+*Final Project*
+
+Language Code Name:
+YREA **SLS** (*Stack Language Specification*)  
+Language Webpage:
+[sls.purplecello.org](https://sls.purplecello.org)  
+Language Specification Repository (Private):
+[git.purplecello.org](https://git.purplecello.org/KylerOlsen/LangsFinalPlaning)  
+Language Implementation Repository:
+[git.purplecello.org](https://git.purplecello.org/KylerOlsen/YREA-SLS)  
+Language Implementation Repository (Mirror on GitHub) (Private):
+[github.com](https://github.com/SnowSE/final-project-KylerOlsen)  
+Assignment Page (Private):
+[snow.instructure.com](https://snow.instructure.com/courses/1154808/assignments/16233203)
+
+In 1986, Hewlett-Packard released their HP-18C and HP-24C calculators, which
+introduced their new RPL operating system and programming language. The language
+was based on LISP and Forth (a stack-oriented language). RPL, aka Reverse Polish
+Lisp, was used by HP in several of their calculators through the 1990s and
+2000s, most famously on the HP-48 series of calculators. HP calculators have
+been a favorite among engineers because of their post-fix notation.
+
+When in my journeyings on the internet a few years ago, I discovered Uiua, a
+pre-fix, stack-based, array-oriented language, which inspired me to create my
+own, except more largely inspired by HP's RPL. I started planning out an idea,
+but never made it far. This semester I was again inspired by looking at the
+various programming languages to again make my own, this time throwing in C to
+the mix. What resulted is my *Stack Language Specification*. Having difficulty
+coming up with a name for the language, I went with SLS.
+
+SLS is a stack-oriented language with C inspired syntax. While these have not
+been implemented for the assignment, I do plan on adding a Rust inspired type
+system, as well as Uiua and LISP inspired array operations. Memory management
+follows the pattern in RPL, everything is on the stack. One of my goals with
+this language is also to have it able to run on an embedded system, such as my
+own custom calculator.
+
+**C** was my selected language. It was an excellent choice for my project as it
+is well suited for systems programming. It is a low level, yet powerful
+language. While string utilities are not as robust as most modern languages, I
+still feel like it was an excellent choice. Other major interpreted languages
+also use C to implement their interpreters, such as Lua and Python.
+
+Manual memory management was a slight difficulty for me. The only way I could
+find what was causing a segmentation fault was to run the binary with `gdb`.
+Still my experience programming C in a Linux environment was fun and rewarding.
+I became accustomed to utilizing the man pages (or manual pages) for
+documentation on the C standard library.
+
+I did use structs and unions heavily which we learned about when we looked at C.
+With them I was able to use polymorphism in defining tokens and data types.
+
+I am able to successfully compile and run this implementation on a Raspberry Pi
+Pico with a RP2040 microcontroller. You can interact with the REPL over a serial
+connection.
+
+**Rust** was the first language I tackled porting my project to. I am not as
+familiar with Rust as I am Python, so thats why I wanted to get going on this
+port first. I avoided using external libraries with C as they can be famously
+difficult to link and compile. Rust's build system, cargo made that issue
+basically non-existent. It is also memory safe with its barrow checker. With it
+being another systems programming language, and these modern features, I feel
+like it is just as good of a choice of a language for my project.
+
+In the past I have often fought with the barrow checker but with this project,
+either my experience, memory mindfulness in my original port, or the extensive
+AI help, I had no fights with the barrow checker this time.
+
+The special feature for the Rust port is being able to export and import the
+interpreter state in the repl using `#save <filename>` and `#load <filename>`.
+
+**Python** was my final port. With it being the language I am most comfortable
+and experienced with, this was an easy port to make. While it is very easy, even
+for someone without my experience, and it has many of the same modern
+conveniences with package management as Rust. Where it is not a systems
+programming language, I would not be able to run this project on an embedded
+system very cleanly or easily, making Python not as good of a choice with my
+goal of portability to embedded systems.
+
+The special feature for the Python port is the SLS Calculator App.
+
+---
+
+https://en.wikipedia.org/wiki/HP_48_series
+https://en.wikipedia.org/wiki/HP-28_series
+https://en.wikipedia.org/wiki/RPL_(programming_language)

SLS_C/.gitignore

@@ -1,3 +1,9 @@
 obj/
 bin/
+build_pico/
 *.o
+*.pdb
+CMakeLists.txt
+pico_arm_gcc_toolchain.cmake
+generated/
+pico-sdk.txt

SLS_C/Failing Tests.md

@@ -0,0 +1,60 @@
+# Failing Tests
+
+These tests fail and haven't been fixed yet as they would likely take major
+refactoring to fix, which I may not have time to do before finals week.
+
+## Integer i64 Overflow
+code: `9223372036854775808:i64`  
+error: `Integer overflow: value exceeds range for i64.`
+
+This test fails because the parsed integer has already overflowed inside the
+interpreter, so an integer token is returned with no overflow error detected.
+
+## Integer i64 Underflow
+code: `-9223372036854775809:i64`  
+error: `Integer overflow: value exceeds range for i64.`
+
+This test fails because the parsed integer has already overflowed inside the
+interpreter, so an integer token is returned with no overflow error detected.
+
+## Integer u64 Overflow
+code: `18446744073709551616:u64`  
+error: `Integer overflow: value exceeds range for u64.`
+
+This test fails because the parsed integer has already overflowed inside the
+interpreter, so an integer token is returned with no overflow error detected.
+
+## Integer i16 Binary Sample
+code: `0b1111111100000000:i16`  
+value: `-256`
+
+This test fails because the interpreter fails to recognize this as a negative
+number, and parses is as `65280`, which is greater than the signed 16-bit max of
+`32767`, resulting in an overflow error.
+
+## Float Default No Leading Digit Negative
+code: `-.25`  
+value: `-0.25`
+
+This test fails because the interpreter fails to recognize a token starting with
+both a `-` then a `.` then a digit, as a numeric literal, resulting in it being
+interpreted as an identifier.
+
+## TokenString Error Inside
+code: `{ 2 3a + }`  
+error: `Invalid decimal literal: unexpected 'a' in decimal integer.`
+
+I don't know why this test is being reported as failing. I think it may be
+trying looking for the error inside the token string.
+
+## TokenString Struct Fields
+code: `{ x: y: }`  
+value: `TokenString`
+
+All non-code token strings won't work properly unless they are also valid code
+token strings. All non-code token string features won't be implemented yet.
+
+## Windows Tests
+
+`test_format_basic_placeholders` and `Integer i32 Min Value` also fail when
+compiling with MSVC on Windows instead of GCC on Linux.

SLS_C/Implementation Mismatches.md

@@ -0,0 +1,9 @@
+# Implementation Mismatches
+
+This is a list of things defined as currently in the specification, but not included in this implementation to reduce scope for the assignment.
+
+- Unicode support
+- Exponential literals
+- Arrays and array functions
+- Type tuples, function defs
+- Structs, unions, etc.

SLS_C/Makefile

@@ -1,77 +0,0 @@
-# Makefile for SLS project with automatic header dependencies
-
-CC ?= gcc
-CFLAGS ?= -std=c11 -Wall -Wextra -g -Iinclude -MMD -MP
-LDFLAGS ?=
-CTESTFLAGS ?= -std=c11 -Wall -Wextra -Wno-unused-function -g -O0 -Iinclude -MMD -MP
-
-SRCDIR := src
-OBJDIR := obj
-BINDIR := bin
-TESTDIR := tests
-
-TARGET := $(BINDIR)/sls
-TEST_TARGET := $(BINDIR)/sls_tests
-
-SOURCES := $(wildcard $(SRCDIR)/*.c)
-OBJECTS := $(patsubst $(SRCDIR)/%.c,$(OBJDIR)/%.o,$(SOURCES))
-NON_MAIN_OBJECTS := $(filter-out $(OBJDIR)/main.o,$(OBJECTS))
-
-TEST_SOURCES := $(wildcard $(TESTDIR)/*.c)
-TEST_OBJECTS := $(patsubst $(TESTDIR)/%.c,$(OBJDIR)/%.o,$(TEST_SOURCES))
-
-# Include dependency files if they exist
--include $(OBJECTS:.o=.d) $(TEST_OBJECTS:.o=.d)
-
-.PHONY: all build run test clean
-
-# Default: build main program
-all: $(TARGET)
-
-# Compile object files
-build: $(OBJECTS)
-
-# Rule to compile .c -> .o (handles both src and tests)
-$(OBJDIR)/%.o: $(SRCDIR)/%.c | $(OBJDIR)
-	$(CC) $(CFLAGS) -c $< -o $@
-
-$(OBJDIR)/%.o: $(TESTDIR)/%.c | $(OBJDIR)
-	$(CC) $(CTESTFLAGS) -c $< -o $@
-
-# Link main program
-$(TARGET): $(OBJECTS) | $(BINDIR)
-	$(CC) $(LDFLAGS) $^ -o $@ -lm
-
-# Run main program
-run: $(TARGET)
-	@echo "Running $(TARGET)..."
-	./$(TARGET)
-
-test_cases: ../SLS_Tests/yaml_to_c_tests.py ../SLS_Tests/cases.yaml
-	python3 ../SLS_Tests/yaml_to_c_tests.py ../SLS_Tests/cases.yaml ./tests/lexer_tests.c
-
-# Build test runner executable
-$(TEST_TARGET): $(TEST_OBJECTS) $(NON_MAIN_OBJECTS) | $(BINDIR)
-	$(CC) $(LDFLAGS) $^ -o $@ -lm
-
-build_tests: test_cases $(TEST_TARGET)
-
-# Run tests
-debug: build_tests
-	gdb ./$(TEST_TARGET)
-
-# Run tests
-test: test_cases $(TEST_TARGET)
-	@echo "Running tests..."
-	./$(TEST_TARGET)
-
-# Create directories if missing
-$(BINDIR):
-	mkdir -p $(BINDIR)
-
-$(OBJDIR):
-	mkdir -p $(OBJDIR)
-
-# Remove build artifacts
-clean:
-	rm -rf $(OBJDIR) $(BINDIR)

SLS_C/README.md

@@ -1,11 +1,23 @@
- # SLS C
+# SLS C
 
 This is the C implementation for the YREA SLS interpreter.
 
-## Running
+## Compiling, Running, and Testing
 
-Build Project: `make build`  
-Build and Run Project: `make run`  
-Build and Run Tests: `make test`
+Interpreter binary location:
+- Linux: `./bin/sls`
+- Windows: `.\bin\sls.exe`
 
-Interpreter binary location: `./bin/sls`
+### Linux (GCC)
+
+Build Project: `python3 build.py all`  
+Build and Run Project: `python3 build.py run`  
+Build and Run Tests: `python3 build.py test`
+
+### Windows (MSVC)
+
+*__For Windows users:__ Use a VS developer shell for all build commands.*
+
+Build Project: `python build.py all`  
+Build and Run Project: `python build.py run`  
+Build and Run Tests: `python build.py test`

SLS_C/SlsStr.md

@@ -0,0 +1,19 @@
+# Sls String
+*string.h*
+
+## Formats
+
+- `y` char\*
+- `c` char
+- `d` int32_t
+- `l` int64_t
+- `u` uint64_t
+- `z` size_t
+- `f` double
+- `n` unicode uint8_t\[4\] (Not Implemented)
+- `s` string.h SlsStr
+- `t` lexer.h TokenType
+- `a` lexer.h ArrayType
+- `i` lexer.h IntegerBuiltInType
+- `e` error.h SlsError
+- `b` bool.h Boolean

SLS_C/build.py

@@ -0,0 +1,515 @@
+#!/usr/bin/env python3
+import os
+import sys
+import subprocess
+from pathlib import Path
+import shutil
+import platform
+
+# ---------------------------------------------------------------------
+# CONFIG
+# ---------------------------------------------------------------------
+SRC_DIR = Path("src")
+TEST_DIR = Path("tests")
+OBJ_DIR = Path("obj")
+BIN_DIR = Path("bin")
+
+TARGET = BIN_DIR / "sls"
+TEST_TARGET = BIN_DIR / "sls_tests"
+
+# Platform-specific settings
+PICO_SDK_PATH = os.environ.get("PICO_SDK_PATH", Path.home() / "pico/pico-sdk")
+PICO_BUILD_DIR = Path("build_pico")
+PICO_TOOLCHAIN_PATH = Path("pico_arm_gcc_toolchain.cmake")
+
+# Unix gcc/clang flags
+COMMON_FLAGS = ["-std=c99", "-Wall", "-Wextra", "-Werror", "-Iinclude", "-g"]
+TEST_FLAGS = ["-std=c99", "-Wall", "-Wextra", "-Wno-unused-function", "-Werror",
+              "-Iinclude", "-g", "-O0"]
+
+# macOS-specific flags (for cross-compilation if needed)
+MACOS_FLAGS = ["-std=c99", "-Wall", "-Wextra", "-Werror", "-Iinclude", "-g",
+               "-mmacosx-version-min=10.13"]
+
+# Windows MSVC flags
+MSVC_FLAGS = ["/std:c11", "/Zi", "/Iinclude"]
+MSVC_TEST_FLAGS = MSVC_FLAGS + []
+
+# RP2040 toolchain file template
+PICO_TOOLCHAIN_TEMPLATE = """set(CMAKE_SYSTEM_NAME Generic)
+set(CMAKE_SYSTEM_PROCESSOR cortex-m0plus)
+
+# Specify the cross compiler
+set(CMAKE_C_COMPILER arm-none-eabi-gcc)
+set(CMAKE_CXX_COMPILER arm-none-eabi-g++)
+set(CMAKE_ASM_COMPILER arm-none-eabi-gcc)
+
+# Compiler flags for Cortex-M0+
+set(CMAKE_C_FLAGS_INIT "-mcpu=cortex-m0plus -mthumb")
+set(CMAKE_CXX_FLAGS_INIT "-mcpu=cortex-m0plus -mthumb")
+set(CMAKE_ASM_FLAGS_INIT "-mcpu=cortex-m0plus -mthumb")
+
+# Don't run the linker on compiler check
+set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)
+
+# Adjust the default behavior of the FIND_XXX() commands:
+# search programs in the host environment
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+
+# Search headers and libraries in the target environment
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+"""
+
+# RP2040 settings
+RP2040_CMAKE_TEMPLATE = """cmake_minimum_required(VERSION 3.13)
+
+# Pico SDK initialization
+set(PICO_SDK_PATH "{pico_sdk_path}")
+include({pico_sdk_path}/external/pico_sdk_import.cmake)
+
+project({project_name} C CXX ASM)
+set(CMAKE_C_STANDARD 11)
+set(CMAKE_CXX_STANDARD 17)
+
+pico_sdk_init()
+
+# Main executable
+add_executable({project_name}
+{source_files}
+)
+
+# Set output name with .elf extension
+set_target_properties({project_name} PROPERTIES
+    OUTPUT_NAME "{project_name}.elf"
+    SUFFIX ""
+)
+
+# Add include directories
+target_include_directories({project_name} PRIVATE
+    ${{CMAKE_CURRENT_LIST_DIR}}/include
+)
+
+# Add compile definitions
+target_compile_definitions({project_name} PRIVATE
+    PICO_BUILD=1
+    GIT_COMMIT_HASH="{git_hash}"
+)
+
+# Link libraries
+target_link_libraries({project_name}
+    pico_stdlib
+    hardware_uart
+    hardware_gpio
+)
+
+# Enable USB/UART output
+pico_enable_stdio_usb({project_name} 1)
+pico_enable_stdio_uart({project_name} 1)
+
+# Create map/bin/hex/uf2 files
+pico_add_extra_outputs({project_name})
+"""
+
+# ---------------------------------------------------------------------
+# PLATFORM DETECTION
+# ---------------------------------------------------------------------
+def detect_platform():
+    """Detect the current operating system"""
+    system = platform.system()
+    if system == "Darwin":
+        return "macos"
+    elif system == "Windows":
+        return "windows"
+    elif system == "Linux":
+        return "linux"
+    return "unknown"
+
+PLATFORM = detect_platform()
+
+# ---------------------------------------------------------------------
+# COMPILER DETECTION
+# ---------------------------------------------------------------------
+def detect_compiler(target_platform=None):
+    """Detect appropriate compiler for the target platform"""
+    if target_platform == "rp2040":
+        return ("arm-none-eabi-gcc", "gcc")
+    
+    target = target_platform or PLATFORM
+    
+    if target == "windows" or os.name == "nt":
+        return ("cl", "msvc")
+    elif target == "macos":
+        # Prefer clang on macOS
+        if shutil.which("clang"):
+            return ("clang", "gcc")
+        return ("gcc", "gcc")
+    else:
+        return ("gcc", "gcc")
+
+CC, CC_KIND = detect_compiler()
+
+# ---------------------------------------------------------------------
+# PYTHON DETECTION
+# ---------------------------------------------------------------------
+def detect_python():
+    if os.name == "nt":
+        return "python"
+    return "python3"
+
+PYTHON = detect_python()
+
+
+# ---------------------------------------------------------------------
+# GIT COMMIT HASH
+# ---------------------------------------------------------------------
+def git_commit_hash():
+    try:
+        result_hash = subprocess.check_output(
+            ["git", "describe", "--always", "--dirty", "--abbrev=7"],
+            cwd=".",
+            stderr=subprocess.DEVNULL,
+            text=True
+        ).strip()
+        result_date = subprocess.check_output(
+            ["git", "show", "-s", "--format=%ci"],
+            cwd=".",
+            stderr=subprocess.DEVNULL,
+            text=True
+        ).strip()
+        return f"{result_hash} {result_date}"
+    except Exception:
+        return "unknown"
+
+
+GIT_HASH = git_commit_hash()
+
+
+# ---------------------------------------------------------------------
+# UTILS
+# ---------------------------------------------------------------------
+def mkdir(p: Path):
+    p.mkdir(parents=True, exist_ok=True)
+
+
+def run(cmd):
+    print(">>", " ".join(str(c) for c in cmd))
+    subprocess.check_call(cmd)
+
+
+def is_up_to_date(src, obj, dep):
+    if "meta" in [src.stem, obj.stem, dep.stem]:
+        return False
+    if not obj.exists():
+        return False
+    if dep.exists() and dep.stat().st_mtime > obj.stat().st_mtime:
+        return False
+    return src.stat().st_mtime < obj.stat().st_mtime
+
+
+# ---------------------------------------------------------------------
+# BUILD RULES
+# ---------------------------------------------------------------------
+def compile_source(src: Path, is_test=False, target_platform=None):
+    mkdir(OBJ_DIR)
+    obj = OBJ_DIR / (src.stem + ".o")
+    dep = OBJ_DIR / (src.stem + ".d")
+
+    if is_up_to_date(src, obj, dep):
+        return obj
+
+    compiler, kind = detect_compiler(target_platform)
+    
+    if kind == "msvc":
+        flags = MSVC_TEST_FLAGS if is_test else MSVC_FLAGS
+        cmd = [compiler] + flags + ["/Fo" + str(obj), "/c", str(src),
+                               f"/DGIT_COMMIT_HASH=\"{GIT_HASH}\""]
+    else:
+        if target_platform == "macos":
+            flags = MACOS_FLAGS if not is_test else TEST_FLAGS + ["-mmacosx-version-min=10.13"]
+        else:
+            flags = TEST_FLAGS if is_test else COMMON_FLAGS
+            
+        cmd = [compiler] + flags + [
+            f"-DGIT_COMMIT_HASH=\"{GIT_HASH}\"",
+            "-MMD", "-MP",
+            "-c", str(src), "-o", str(obj)
+        ]
+
+    run(cmd)
+    return obj
+
+
+def link_executable(objects, output: Path, target_platform=None):
+    mkdir(BIN_DIR)
+    compiler, kind = detect_compiler(target_platform)
+    
+    if kind == "msvc":
+        cmd = [compiler] + list(map(str, objects)) + ["/Fe" + str(output)]
+    else:
+        cmd = [compiler] + list(map(str, objects)) + ["-lm", "-o", str(output)]
+    run(cmd)
+
+
+# ---------------------------------------------------------------------
+# TEST CASE GENERATION
+# ---------------------------------------------------------------------
+def generate_tests():
+    script = Path("../SLS_Tests/yaml_to_c_tests.py")
+    yaml = Path("../SLS_Tests/cases.yaml")
+    out = TEST_DIR / "lexer_tests.c"
+
+    if not script.exists() or not yaml.exists():
+        print("Test generation skipped (missing files).")
+        return False
+
+    if out.exists() and out.stat().st_mtime > yaml.stat().st_mtime:
+        return True
+
+    run([PYTHON, str(script), str(yaml), str(out)])
+    return True
+
+
+# ---------------------------------------------------------------------
+# RP2040 BUILD
+# ---------------------------------------------------------------------
+def check_pico_sdk():
+    """Check if Pico SDK is available"""
+    sdk_path = Path(PICO_SDK_PATH)
+    if not sdk_path.exists():
+        print(f"ERROR: Pico SDK not found at {sdk_path}")
+        print("Please set PICO_SDK_PATH environment variable or install SDK at ~/pico/pico-sdk")
+        return False
+    
+    # Check for ARM toolchain
+    if not shutil.which("arm-none-eabi-gcc"):
+        print("ERROR: ARM toolchain not found!")
+        print("Please install arm-none-eabi-gcc:")
+        print("  Ubuntu/Debian: sudo apt install gcc-arm-none-eabi")
+        print("  macOS: brew install arm-none-eabi-gcc")
+        return False
+    
+    return True
+
+
+def generate_pico_toolchain():
+    """Generate ARM GCC toolchain file for CMake"""
+    with open(PICO_TOOLCHAIN_PATH, "w") as f:
+        f.write(PICO_TOOLCHAIN_TEMPLATE)
+    print(f"Generated {PICO_TOOLCHAIN_PATH}")
+
+
+def generate_pico_cmake(project_name="sls"):
+    """Generate CMakeLists.txt for RP2040 build"""
+    sources = list(SRC_DIR.glob("*.c"))
+    # Exclude main.c, repl.c, file.c and test files for Pico build
+    # pico_main.c will provide its own REPL implementation
+    sources = [s for s in sources 
+               if s.name not in ["main.c", "repl.c", "file.c"] 
+               and "test" not in s.stem.lower()]
+    
+    # Check for pico_main.c
+    pico_main = SRC_DIR / "pico_main.c"
+    if not pico_main.exists():
+        print(f"WARNING: {pico_main} not found! Please create it.")
+        print("The Pico build requires a pico_main.c file.")
+        return False
+    
+    sources.append(pico_main)
+    
+    source_files = "\n".join(f"    {s}" for s in sources)
+    
+    cmake_content = RP2040_CMAKE_TEMPLATE.format(
+        project_name=project_name,
+        source_files=source_files,
+        git_hash=GIT_HASH,
+        pico_sdk_path=PICO_SDK_PATH
+    )
+    
+    cmake_file = Path("CMakeLists.txt")
+    with open(cmake_file, "w") as f:
+        f.write(cmake_content)
+    
+    print(f"Generated {cmake_file}")
+    return True
+
+
+def build_rp2040():
+    """Build for RP2040 using CMake"""
+    if not check_pico_sdk():
+        return False
+    
+    print("\n=== Building for RP2040 ===\n")
+    
+    # Generate toolchain file
+    generate_pico_toolchain()
+    
+    # Generate CMakeLists.txt
+    if not generate_pico_cmake():
+        return False
+    
+    # Create build directory
+    mkdir(PICO_BUILD_DIR)
+    
+    # Run CMake with explicit toolchain
+    cmake_cmd = [
+        "cmake",
+        "-B", str(PICO_BUILD_DIR),
+        "-S", ".",
+        f"-DCMAKE_TOOLCHAIN_FILE={PICO_TOOLCHAIN_PATH}"
+    ]
+    run(cmake_cmd)
+    
+    # Build
+    build_cmd = ["cmake", "--build", str(PICO_BUILD_DIR), "-j4"]
+    run(build_cmd)
+    
+    # Show output files
+    uf2_file = PICO_BUILD_DIR / "sls.uf2"
+    if uf2_file.exists():
+        print(f"\nBuild successful! UF2 file: {uf2_file}")
+        print("To flash: Copy this file to your Pico in BOOTSEL mode")
+    
+    return True
+
+
+# ---------------------------------------------------------------------
+# MACOS BUILD
+# ---------------------------------------------------------------------
+def build_macos():
+    """Build for macOS (can be run on macOS or cross-compile on Linux)"""
+    print("\n=== Building for macOS ===\n")
+    
+    if PLATFORM != "macos" and PLATFORM != "linux":
+        print("ERROR: macOS builds require macOS or Linux with osxcross")
+        return False
+    
+    sources = list(SRC_DIR.glob("*.c"))
+    objects = [compile_source(s, is_test=False, target_platform="macos") for s in sources]
+    
+    macos_target = BIN_DIR / "sls_macos"
+    link_executable(objects, macos_target, target_platform="macos")
+    
+    print(f"\nBuild successful! Binary: {macos_target}")
+    return True
+
+
+# ---------------------------------------------------------------------
+# TARGETS
+# ---------------------------------------------------------------------
+def build_main():
+    sources = list(SRC_DIR.glob("*.c"))
+    objects = [compile_source(s, is_test=False) for s in sources if s.name != 'pico_main.c']
+    link_executable(objects, TARGET)
+
+
+def build_tests():
+    generate_tests()
+    test_sources = list(TEST_DIR.glob("*.c"))
+    main_sources = [s for s in SRC_DIR.glob("*.c") if s.name != "main.c"]
+
+    test_objects = [compile_source(s, is_test=True) for s in test_sources]
+    shared_objects = [compile_source(s, is_test=False) for s in main_sources]
+
+    link_executable(test_objects + shared_objects, TEST_TARGET)
+
+
+def clean():
+    shutil.rmtree(OBJ_DIR, ignore_errors=True)
+    shutil.rmtree(BIN_DIR, ignore_errors=True)
+    shutil.rmtree(PICO_BUILD_DIR, ignore_errors=True)
+    cmake_file = Path("CMakeLists.txt")
+    if cmake_file.exists():
+        cmake_file.unlink()
+    toolchain_file = PICO_TOOLCHAIN_PATH
+    if toolchain_file.exists():
+        toolchain_file.unlink()
+    print("Cleaned.")
+
+
+def run_main():
+    build_main()
+    print("\n--- Running program ---\n")
+    subprocess.call([str(TARGET)])
+
+
+def run_tests():
+    build_tests()
+    print("\n--- Running tests ---\n")
+    subprocess.call([str(TEST_TARGET)])
+
+
+def debug_tests():
+    build_tests()
+    if os.name == "nt":
+        print("Debugging on Windows requires Visual Studio debugger.")
+    else:
+        subprocess.call(["gdb", str(TEST_TARGET)])
+
+
+def show_help():
+    help_text = """
+Build Script for Multi-Platform Compilation
+============================================
+
+Usage: python3 build.py [command]
+
+Commands:
+  all, main, build    Build for current platform
+  run                 Build and run program
+  test                Build and run tests
+  debug               Build tests and run debugger
+  clean               Remove build artifacts
+  
+  macos               Build for macOS
+  pico, rp2040        Build for RP2040 (Raspberry Pi Pico)
+  
+  help                Show this help message
+
+Environment Variables:
+  PICO_SDK_PATH       Path to Pico SDK (default: ~/pico/pico-sdk)
+
+Examples:
+  python3 build.py build      # Build for current platform
+  python3 build.py pico       # Build for RP2040
+  python3 build.py macos      # Build for macOS
+  python3 build.py clean      # Clean all build files
+"""
+    print(help_text)
+
+
+# ---------------------------------------------------------------------
+# ENTRY POINT
+# ---------------------------------------------------------------------
+def main():
+    if len(sys.argv) < 2:
+        show_help()
+        return
+
+    cmd = sys.argv[1]
+
+    match cmd:
+        case "all" | "main" | "build":
+            build_main()
+        case "run":
+            run_main()
+        case "test":
+            run_tests()
+        case "debug":
+            debug_tests()
+        case "clean":
+            clean()
+        case "macos":
+            build_macos()
+        case "pico" | "rp2040":
+            build_rp2040()
+        case "help" | "-h" | "--help":
+            show_help()
+        case _:
+            print(f"Unknown target: {cmd}")
+            print("Run 'python3 build.py help' for usage information")
+
+
+if __name__ == "__main__":
+    main()

SLS_C/fib.min.sls

@@ -0,0 +1 @@
+{ 2 - dup 0 <= { drop 1 } { 1 1 rot 0 swap { drop swap 1 pick + } for swap drop } if } lambda ::fib const

SLS_C/fib.sls

@@ -0,0 +1,17 @@
+{
+	// Start with which Fibonacci number we want (Nth Fibonacci number)
+	2 - // We push the first two already
+	dup 0 <= { drop 1 } {
+		1 1 // Starting Fibonacci numbers
+		rot 0 swap // Setting up loop from zero to N
+		{
+			drop // Discard the loop counter
+			swap 1 pick // Swap n-1 and n-2 and copy n-1
+			+ // Add n-2 and the copy of n-1
+			// n and n-1 left on stack
+		} for
+		swap drop // Drop n-1 from the stack
+	} if
+} lambda ::fib const
+
+8 fib

SLS_C/include/sls/bool.h

@@ -0,0 +1,14 @@
+// Kyler Olsen
+// YREA SLS
+// SLS Boolean Header
+// November 2025
+
+#ifndef SLS_BOOLEAN_H
+#define SLS_BOOLEAN_H
+
+typedef enum {
+    FALSE,
+    TRUE,
+} Boolean;
+
+#endif // SLS_BOOLEAN_H

SLS_C/include/sls/builtin.h

@@ -0,0 +1,31 @@
+// Kyler Olsen
+// YREA SLS
+// Builtin Functions Header
+// November 2025
+
+#ifndef SLS_BUILTIN_FUNCTIONS_H
+#define SLS_BUILTIN_FUNCTIONS_H
+
+#include "sls/bool.h"
+#include "sls/interpreter.h"
+
+#if __SIZEOF_POINTER__ == 4
+    // 32-bit system
+    #define SLS_INTEGER_BUILTIN_DEFAULT INTEGER_I32
+    #define SLS_UNSIGNED_INTEGER_BUILTIN_DEFAULT INTEGER_U32
+    #define SLS_FLOAT_BUILTIN_DEFAULT TOKEN_FLOAT
+#elif __SIZEOF_POINTER__ == 8
+    // 64-bit system
+    #define SLS_INTEGER_BUILTIN_DEFAULT INTEGER_I64
+    #define SLS_UNSIGNED_INTEGER_BUILTIN_DEFAULT INTEGER_U64
+    #define SLS_FLOAT_BUILTIN_DEFAULT TOKEN_DOUBLE
+#else
+    // Fallback
+    #define SLS_INTEGER_BUILTIN_DEFAULT INTEGER_I16
+    #define SLS_UNSIGNED_INTEGER_BUILTIN_DEFAULT INTEGER_U16
+    #define SLS_FLOAT_BUILTIN_DEFAULT TOKEN_FLOAT
+#endif
+
+Boolean load_builtins(InterpreterState *interpreter_state);
+
+#endif // SLS_BUILTIN_FUNCTIONS_H

SLS_C/include/sls/errors.h

@@ -7,14 +7,12 @@
 #define SLS_ERROR_H
 
 #include <stdint.h>
+#include <stddef.h>
 
-typedef enum {
-    FALSE,
-    TRUE,
-} Boolean;
+#include "./string.h"
 
 typedef struct {
-    const char *message;
+    SlsStr message;
     int32_t code;
 } SlsError;
 
@@ -24,7 +22,7 @@ typedef enum {
 } SlsResultType;
 
 typedef struct {
-    const char *filename;
+    SlsStr filename;
     size_t line;
     size_t column;
     size_t length;

SLS_C/include/sls/file.h

@@ -0,0 +1,16 @@
+// Kyler Olsen
+// YREA SLS
+// File Header
+// November 2025
+
+#ifndef SLS_FILE_H
+#define SLS_FILE_H
+
+#include "sls/bool.h"
+#include "sls/string.h"
+#include "sls/interpreter.h"
+
+Boolean exec_file(InterpreterState *interpreter_state, SlsStr filename);
+int file(SlsStr filename);
+
+#endif // SLS_FILE_H

SLS_C/include/sls/hash_table.h

@@ -0,0 +1,37 @@
+// Kyler Olsen
+// YREA SLS
+// Hash Table Header
+// November 2025
+
+#ifndef SLS_HASH_TABLE_H
+#define SLS_HASH_TABLE_H
+
+#include <stddef.h>
+
+#include "sls/string.h"
+
+typedef struct Bucket {
+    uint32_t hash_a;
+    uint32_t hash_b;
+    void *item;
+    struct Bucket *next;
+} Bucket;
+
+typedef struct {
+    size_t buckets_count;
+    Bucket *buckets[];
+} HashTable;
+
+// Initializes a HashTable with atleast buckets_count number of buckets. Returns NULL on Memory Allocation Error.
+HashTable *init_hash_table(size_t min_buckets_count);
+// Frees memory owned by the HashTable.
+void del_hash_table(HashTable *ht);
+
+// Inserts an item into the HashTable based on its key. Returns FALSE on Memory Allocation Error.
+Boolean hash_table_put(HashTable *ht, SlsStr key, void *item);
+// Gets the item associated with the given key. Returns default item if not found.
+void *hash_table_get(const HashTable *ht, SlsStr key, void *default_item);
+// Deletes the item associated with the given key. Returns FALSE if item is not found.
+Boolean hash_table_del(HashTable *ht, SlsStr key);
+
+#endif // SLS_HASH_TABLE_H

SLS_C/include/sls/interpreter.h

@@ -0,0 +1,85 @@
+// Kyler Olsen
+// YREA SLS
+// Interpreter Header
+// November 2025
+
+#ifndef SLS_INTERPRETER_H
+#define SLS_INTERPRETER_H
+
+#include <stddef.h>
+
+#include "sls/bool.h"
+#include "sls/lexer.h"
+#include "sls/hash_table.h"
+
+typedef enum {
+    STACK_IDENTIFIER,
+    STACK_I64,
+    STACK_I32,
+    STACK_I16,
+    STACK_I8,
+    STACK_U64,
+    STACK_U32,
+    STACK_U16,
+    STACK_U8,
+    STACK_FLOAT,
+    STACK_DOUBLE,
+    STACK_CHARACTER,
+    STACK_BOOLEAN,
+    STACK_TOKEN_STRING,
+    STACK_CALLABLE,
+} StackType;
+
+extern const char *STACK_TYPES_NAMES[];
+extern const char *STACK_TYPES_TYPES[];
+extern const size_t STACK_TYPE_COUNT;
+
+typedef struct StackItem {
+    StackType type;
+    union {
+        Identifier identifier; // type == STACK_IDENTIFIER
+        int64_t i64; // type == STACK_I64
+        int32_t i32; // type == STACK_I32
+        int16_t i16; // type == STACK_I16
+        int8_t i8; // type == STACK_I8
+        uint64_t u64; // type == STACK_U64
+        uint32_t u32; // type == STACK_U32
+        uint16_t u16; // type == STACK_U16
+        uint8_t u8; // type == STACK_U8
+        float f32; // type == STACK_FLOAT
+        double f64; // type == STACK_DOUBLE
+        uint8_t character; // type == STACK_CHARACTER
+        Boolean boolean; // type == STACK_BOOLEAN
+        TokenString token_string; // type == STACK_TOKEN_STRING
+    };
+    struct StackItem *next;
+} StackItem;
+
+typedef struct {
+    StackItem *stack;
+    HashTable *functions;
+} InterpreterState;
+
+typedef enum {
+    FUNCTION_TOKEN_STRING,
+    FUNCTION_BUILTIN,
+} FunctionType;
+
+typedef struct {
+    FunctionType type;
+    union {
+        TokenString token_string; // type == FUNCTION_TOKEN_STRING
+        Boolean (*builtin)(InterpreterState *); // type == FUNCTION_BUILTIN
+    };
+} FunctionItem;
+
+Boolean push_token(InterpreterState *interpreter_state, Token token);
+void clean_stack(StackItem *item);
+
+Boolean execute_func(InterpreterState *interpreter_state, SlsStr key);
+Boolean execute_token_string(InterpreterState *interpreter_state, TokenString token_string);
+Boolean execute(InterpreterState *interpreter_state, LexerTokenResult *token);
+InterpreterState *interpreter_create();
+void interpreter_delete(InterpreterState *interpreter_state);
+
+#endif // SLS_INTERPRETER_H

SLS_C/include/sls/lexer.h

@@ -8,13 +8,28 @@
 
 #include <stddef.h>
 
-#include "sls/sls_errors.h"
+#include "sls/bool.h"
+#include "sls/errors.h"
+
+#if __SIZEOF_POINTER__ == 4
+    // 32-bit system
+    #define SLS_INTEGER_TYPE_DEFAULT INTEGER_I32
+    #define SLS_FLOAT_TYPE_DEFAULT NUMERIC_F32
+#elif __SIZEOF_POINTER__ == 8
+    // 64-bit system
+    #define SLS_INTEGER_TYPE_DEFAULT INTEGER_I64
+    #define SLS_FLOAT_TYPE_DEFAULT NUMERIC_F64
+#else
+    // Fallback
+    #define SLS_INTEGER_TYPE_DEFAULT INTEGER_I16
+    #define SLS_FLOAT_TYPE_DEFAULT NUMERIC_F32
+#endif
 
 extern const size_t TYPE_NAMES_SAFE_LENGTH;
 
 typedef struct {
-    const char *filename;
-    const char *source_code;
+    SlsStr filename;
+    SlsStr source_code;
     size_t pos;
     size_t column;
     size_t line;
@@ -26,6 +41,7 @@ typedef enum {
     TOKEN_INTEGER,
     TOKEN_FLOAT,
     TOKEN_DOUBLE,
+    TOKEN_CHARACTER,
     TOKEN_STRING,
     TOKEN_BOOLEAN,
     TOKEN_ARRAY,
@@ -34,6 +50,7 @@ typedef enum {
 } TokenType;
 
 extern const char *TOKEN_TYPES_NAMES[];
+extern const size_t TOKEN_TYPE_COUNT;
 
 typedef enum {
     ARRAY_IDENTIFIER,
@@ -47,16 +64,17 @@ typedef enum {
     ARRAY_U8,
     ARRAY_FLOAT,
     ARRAY_DOUBLE,
+    ARRAY_CHARACTER,
     ARRAY_STRING,
     ARRAY_BOOLEAN,
     ARRAY_STRUCT_INLINE,
 } ArrayType;
 
 extern const char *ARRAY_TYPES_NAMES[];
+extern const size_t ARRAY_TYPE_COUNT;
 
 typedef struct {
-    const char *name;
-    size_t length;
+    SlsStr name;
     Boolean is_literal;
 } Identifier;
 
@@ -72,17 +90,13 @@ typedef enum {
 } IntegerBuiltInType;
 
 extern const char *INTEGER_TYPES_NAMES[];
+extern const size_t INTEGER_TYPE_COUNT;
 
 typedef struct {
     uint64_t value;
     IntegerBuiltInType type;
 } IntegerLiteral;
 
-typedef struct {
-    const char *value;
-    size_t length;
-} StringLiteral;
-
 typedef struct Token Token;
 
 typedef struct {
@@ -99,7 +113,7 @@ typedef struct {
 
 typedef struct {
     void **values;
-    const char *name;
+    SlsStr name;
 } StructInline;
 
 typedef struct ArrayLiteral {
@@ -109,7 +123,8 @@ typedef struct ArrayLiteral {
         uint64_t *integer_literals; // type in { ARRAY_I64, ARRAY_I32, ARRAY_I16, ARRAY_I8, ARRAY_U64, ARRAY_U32, ARRAY_U16, ARRAY_U8, }
         float *float_literals;     // type == ARRAY_FLOAT
         double *double_literals; // type == ARRAY_DOUBLE
-        StringLiteral *string_literals; // type == ARRAY_STRING
+        uint8_t *character_literal; // type == ARRAY_CHARACTER
+        SlsStr *string_literals; // type == ARRAY_STRING
         Boolean *boolean_literals; // type == ARRAY_BOOLEAN
         TokenString *token_strings; // type == ARRAY_TOKEN_STRING
         TypeTuple *type_tuples; // type == ARRAY_TYPE_TUPLE
@@ -126,7 +141,8 @@ struct Token {
         IntegerLiteral integer_literal; // type == TOKEN_INTEGER
         float float_literal; // type == TOKEN_FLOAT
         double double_literal; // type == TOKEN_DOUBLE
-        StringLiteral string_literal; // type == TOKEN_STRING
+        uint8_t character_literal; // type == TOKEN_CHARACTER
+        SlsStr string_literal; // type == TOKEN_STRING
         Boolean boolean_literal; // type == TOKEN_BOOLEAN
         ArrayLiteral array_literal; // type == TOKEN_ARRAY
         TokenString token_string; // type == TOKEN_TOKEN_STRING
@@ -152,8 +168,10 @@ typedef struct {
     };
 } LexerResult;
 
-void init_lexer(LexerInfo *lexer_info, const char *filename, const char *source_code);
+TokenString copy_token_string(TokenString token_string);
+void init_lexer(LexerInfo *lexer_info, SlsStr filename, SlsStr source_code);
 LexerTokenResult *get_token(LexerTokenResult *head, size_t i);
+void clean_token_string(TokenString token_string);
 void clean_token_result(LexerTokenResult *head);
 LexerResult lexical_analysis(LexerInfo *lexer_info);
 

SLS_C/include/sls/meta.h

@@ -0,0 +1,35 @@
+// Kyler Olsen
+// YREA SLS
+// Main Header
+// November 2025
+
+#ifndef SLS_MAIN_H
+#define SLS_MAIN_H
+
+#define SLS_NAME "SLS_C"
+#define SLS_VER "0.0.2-alpha"
+
+#ifndef GIT_COMMIT_HASH
+    #define GIT_COMMIT_HASH "UNKNOWN"
+#endif
+
+#if defined(__GNUC__)
+    #define COMPILER_NAME "GCC"
+    #define COMPILER_VER __GNUC__
+
+#elif defined(__clang__)
+    #define COMPILER_NAME "Clang"
+    #define COMPILER_VER __clang_major__
+
+#elif defined(_MSC_VER)
+    #define COMPILER_NAME "MSVC"
+    #define COMPILER_VER _MSC_VER
+
+#else
+    #define COMPILER_NAME "Unknown compiler"
+    #define COMPILER_VER 0
+#endif
+
+void print_version();
+
+#endif // SLS_MAIN_H

SLS_C/include/sls/repl.h

@@ -0,0 +1,11 @@
+// Kyler Olsen
+// YREA SLS
+// REPL Header
+// November 2025
+
+#ifndef SLS_REPL_H
+#define SLS_REPL_H
+
+int repl();
+
+#endif // SLS_REPL_H

SLS_C/include/sls/string.h

@@ -7,8 +7,29 @@
 #define SLS_STRING_H
 
 #include <stddef.h>
+#include <stdint.h>
+#include <stdarg.h>
 
-int isascii(unsigned char c);
-size_t strnlen(const char *s, size_t maxlen);
+#include "bool.h"
+
+typedef struct {
+    size_t len; // Number of useable characters (does not include trailing null character)
+    char *str;
+    Boolean allocated;
+} SlsStr;
+
+#define SLS_STR_CONST(s) {sizeof(s) - 1, (s), FALSE}
+#define SLS_STR_NULL_CONST {0, NULL, FALSE}
+#define SLS_STR(s) (SlsStr) SLS_STR_CONST(s)
+#define SLS_STR_NULL (SlsStr) SLS_STR_NULL_CONST
+
+int sls_isascii(unsigned char c);
+size_t sls_str_nlen(const char *s, size_t maxlen);
+SlsStr sls_str_malloc(const char *s, size_t maxlen);
+SlsStr sls_str_new(size_t length);
+SlsStr sls_str_cpy(SlsStr s);
+int32_t sls_str_cmp(SlsStr a, SlsStr b);
+void sls_str_free(SlsStr *s);
+SlsStr sls_format(const SlsStr s, ...);
 
 #endif // SLS_STRING_H

SLS_C/include/tests/lexer_test_helpers.h

@@ -14,7 +14,8 @@
 #include <stdio.h>
 #include <math.h>
 
-#include "sls/sls_errors.h"
+#include "sls/errors.h"
+#include "sls/bool.h"
 #include "sls/lexer.h"
 #include "sls/string.h"
 #include "tests/lexer_test_helpers.h"
@@ -27,8 +28,7 @@ typedef struct {
 
 typedef struct {
     Boolean is_literal;
-    size_t length;
-    const char *name;
+    SlsStr name;
 } TestIdentifierValue;
 
 typedef struct {
@@ -36,11 +36,6 @@ typedef struct {
     uint64_t value;
 } TestIntegerValue;
 
-typedef struct {
-    size_t length;
-    const char *string;
-} TestStringValue;
-
 typedef struct {
     size_t dimensions;
     size_t *shape;
@@ -68,7 +63,7 @@ typedef struct {
 typedef struct {
     size_t dimensions;
     size_t *shape;
-    TestStringValue *values;
+    SlsStr *values;
 } TestArrayStringValue;
 
 typedef struct {
@@ -80,8 +75,7 @@ typedef struct {
 typedef struct {
     size_t dimensions;
     size_t *shape;
-    size_t struct_name_length;
-    const char *struct_name;
+    SlsStr struct_name;
     Boolean (*struct_handler)(LexerTest *, LexerResult, size_t, size_t, void *, void *);
     void **values;
 } TestArrayStructInlineValue;
@@ -103,15 +97,11 @@ typedef struct {
     TestIdentifierValue *output_values;
 } TestTypeTupleValue;
 
-typedef struct {
-    size_t length;
-    const char *message;
-} TestErrorMessage;
-
-LexerTest start_up_test(const char *test_name, const char *test_code);
+LexerTest start_up_test(SlsStr test_name, SlsStr test_code);
 void clean_up_test(LexerResult result);
+TestResult error_test_out_of_mem(LexerTest *test);
 TestResult error_test(LexerTest *test, LexerResult result, SlsError error);
-TestResult logic_fail_test(LexerTest *test, LexerResult result, char *message);
+TestResult logic_fail_test(LexerTest *test, LexerResult result, SlsStr message);
 TestResult error_fail_test(LexerTest *test, LexerResult result, SlsError error);
 TestResult skip_test(LexerTest *test, LexerResult result);
 TestResult skip_test_no_result(LexerTest *test);
@@ -120,9 +110,10 @@ TestResult pass_test(LexerTest *test, LexerResult result);
 Boolean test_eof_value(LexerTest *test, LexerResult result, size_t i, void *_);
 Boolean test_identifier_value(LexerTest *test, LexerResult result, size_t i, TestIdentifierValue *value);
 Boolean test_integer_value(LexerTest *test, LexerResult result, size_t i, TestIntegerValue *value);
+Boolean test_character_value(LexerTest *test, LexerResult result, size_t i, uint8_t *value);
 Boolean test_float_value(LexerTest *test, LexerResult result, size_t i, float *value);
 Boolean test_double_value(LexerTest *test, LexerResult result, size_t i, double *value);
-Boolean test_string_value(LexerTest *test, LexerResult result, size_t i, TestStringValue *value);
+Boolean test_string_value(LexerTest *test, LexerResult result, size_t i, SlsStr *value);
 Boolean test_boolean_value(LexerTest *test, LexerResult result, size_t i, Boolean *value);
 Boolean test_array_identifier_value(LexerTest *test, LexerResult result, size_t i, TestArrayIdentifierValue *values);
 Boolean test_array_integer_value(LexerTest *test, LexerResult result, size_t i, TestArrayIntegerValue *values);
@@ -133,6 +124,6 @@ Boolean test_array_boolean_value(LexerTest *test, LexerResult result, size_t i,
 Boolean test_array_struct_inline_value(LexerTest *test, LexerResult result, size_t i, TestArrayStructInlineValue *values);
 Boolean test_token_string_value(LexerTest *test, LexerResult result, size_t i, TestTokenStringValue *values);
 Boolean test_type_tuple_value(LexerTest *test, LexerResult result, size_t i, TestTypeTupleValue *values);
-Boolean test_for_error(LexerTest *test, LexerResult result, size_t i, TestErrorMessage *error);
+Boolean test_for_error(LexerTest *test, LexerResult result, size_t i, SlsStr *error);
 
 #endif // SLS_LEXER_TEST_HELPERS_H

SLS_C/include/tests/tests.h

@@ -8,9 +8,10 @@
 
 #include <stddef.h>
 
-#include "sls/sls_errors.h"
+#include "sls/errors.h"
+#include "sls/string.h"
 
-extern const char *TEST_FILE_NAME;
+extern const SlsStr TEST_FILE_NAME;
 
 typedef enum {
     TEST_ERROR, // The test encountered an error
@@ -22,20 +23,23 @@ typedef enum {
 } TestResultType;
 
 typedef struct {
-    const char *name;
+    SlsStr name;
     TestResultType status;
     union {
-        char *message; // status in { TEST_LOGIC_FAIL, }
+        SlsStr message; // status in { TEST_LOGIC_FAIL, }
         SlsError error; // status in { TEST_ERROR, TEST_ERROR_FAIL, }
     };
 } TestResult;
 
 typedef struct {
-    const char *section;
+    SlsStr section;
     size_t count;
     TestResult* tests;
 } TestsReport;
 
+TestsReport run_string_tests();
 TestsReport run_lexer_tests();
+TestsReport run_hash_table_tests();
+TestsReport run_extra_tests();
 
 #endif // SLS_TESTS_H

SLS_C/src/file.c

@@ -0,0 +1,68 @@
+// Kyler Olsen
+// YREA SLS
+// File
+// November 2025
+
+#include <stdio.h>
+
+#include "sls/file.h"
+#include "sls/bool.h"
+#include "sls/string.h"
+#include "sls/interpreter.h"
+
+Boolean exec_file(InterpreterState *interpreter_state, SlsStr filename) {
+    FILE *file_o = fopen(filename.str, "r");
+    if (file_o == NULL) {
+        printf("Cannot read file: %s\n", filename.str);
+        return FALSE;
+    }
+
+    if (fseek(file_o, 0, SEEK_END)) return FALSE;
+    size_t file_length = ftell(file_o);
+    rewind(file_o);
+
+    LexerInfo lexer_info;
+    SlsStr code = sls_str_new(file_length);
+    for (size_t i = 0; i < file_length; i++) {
+        int character = fgetc(file_o);
+        if (character == EOF) return FALSE;
+        else code.str[i] = (char)character;
+    }
+    init_lexer(&lexer_info, filename, code);
+
+    LexerResult result = lexical_analysis(&lexer_info);
+    if (result.type == SLS_ERROR) {
+        printf("%s\n", result.error.message.str);
+        sls_str_free(&result.error.message);
+        return FALSE;
+    } else {
+        LexerTokenResult *head = result.result;
+        while (head) {
+            if (head->type == SLS_ERROR) {
+                printf("%s\n", head->error.message.str);
+                sls_str_free(&result.error.message);
+                clean_token_result(result.result);
+                return FALSE;
+            } else if (!execute(interpreter_state, head)) {
+                printf("A runtime error occurred!\n");
+                break;
+            }
+            head = head->next;
+        }
+        clean_token_result(result.result);
+    }
+    sls_str_free(&code);
+
+    if (fclose(file_o)) return FALSE;
+    else return TRUE;
+}
+
+int file(SlsStr filename) {
+    printf("Executing file: %s\n", filename.str);
+    InterpreterState *interpreter_state = interpreter_create();
+    if (interpreter_state == NULL) return 1;
+    Boolean success = exec_file(interpreter_state, filename);
+    interpreter_delete(interpreter_state);
+    if (success) return 0;
+    else return 1;
+}

SLS_C/src/hash_table.c

@@ -0,0 +1,155 @@
+// Kyler Olsen
+// YREA SLS
+// Hash Table
+// November 2025
+
+#include <stdlib.h>
+
+#include "sls/hash_table.h"
+#include "sls/string.h"
+
+static size_t next_power_of_two(size_t n) {
+    if (n < 2) return 2;
+    n--;
+    n |= n >> 1;
+    n |= n >> 2;
+    n |= n >> 4;
+    n |= n >> 8;
+    n |= n >> 16;
+    #if SIZE_MAX > UINT32_MAX
+        n |= n >> 32;
+    #endif
+    n++;
+    return n;
+}
+
+HashTable *init_hash_table(size_t min_buckets_count) {
+    size_t buckets_count = next_power_of_two(min_buckets_count);
+    size_t size = sizeof(HashTable) + buckets_count * sizeof(Bucket);
+    HashTable *ht = (HashTable *)malloc(size);
+    if (!ht) return NULL;
+    ht->buckets_count = buckets_count;
+    for (size_t i = 0; i < buckets_count; i++)
+        ht->buckets[i] = NULL;
+    return ht;
+}
+
+void del_hash_table(HashTable *ht) {
+    for (size_t i = 0; i < ht->buckets_count; i++) {
+        Bucket *head = ht->buckets[i];
+        while (head) {
+            Bucket *next = head->next;
+            // TODO: Does item need to be freed?
+            free(head);
+            head = next;
+        }
+    }
+    free(ht);
+}
+
+static inline uint32_t sls_hash_a(SlsStr key) {
+    // FNV-1a
+    uint32_t hash = 2166136261u;
+    const uint8_t *p = (const uint8_t *)key.str;
+    for (size_t i = 0; i < key.len; i++) {
+        hash ^= p[i];
+        hash *= 16777619u;
+    }
+    return hash;
+}
+
+static inline uint32_t sls_hash_b(SlsStr key) {
+    // Murmur2A
+    const uint32_t m = 0x5bd1e995;
+    uint32_t hash = 0;
+
+    while (key.len >= 4) {
+        uint32_t k = (uint32_t)key.str[0]
+            | (uint32_t)key.str[1] << 8
+            | (uint32_t)key.str[2] << 16
+            | (uint32_t)key.str[3] << 24;
+        k *= m;
+        k ^= k >> 24;
+        k *= m;
+
+        hash *= m;
+        hash ^= k;
+
+        key.str += 4;
+        key.len -= 4;
+    }
+
+    if (key.len >= 3)
+        hash ^= key.str[2] << 16;
+    if (key.len >= 2)
+        hash ^= key.str[1] << 8;
+    if (key.len >= 1)
+        hash ^= key.str[0];
+    hash *= m;
+
+    hash ^= hash >> 13;
+    hash *= m;
+    hash ^= hash >> 15;
+
+    return hash;
+}
+
+Boolean hash_table_put(HashTable *ht, SlsStr key, void *item) {
+    uint32_t hash_a = sls_hash_a(key);
+    uint32_t hash_b = sls_hash_b(key);
+    size_t bucket_index = hash_a & (ht->buckets_count - 1);
+
+    for (Bucket *node = ht->buckets[bucket_index]; node; node = node->next) {
+        if (node->hash_a == hash_a && node->hash_b == hash_b) {
+            // TODO: Does item need to be freed before being replaced?
+            node->item = item;
+            return TRUE;
+        }
+    }
+
+    Bucket *bucket = (Bucket *)malloc(sizeof(Bucket));
+    if (!bucket)
+        return FALSE;
+    bucket->hash_a = hash_a;
+    bucket->hash_b = hash_b;
+    bucket->item = item;
+    bucket->next = ht->buckets[bucket_index];
+    ht->buckets[bucket_index] = bucket;
+
+    return TRUE;
+}
+
+void *hash_table_get(const HashTable *ht, SlsStr key, void *default_item) {
+    uint32_t hash_a = sls_hash_a(key);
+    uint32_t hash_b = sls_hash_b(key);
+    size_t bucket_index = hash_a & (ht->buckets_count - 1);
+
+    for (Bucket *node = ht->buckets[bucket_index]; node; node = node->next)
+        if (node->hash_a == hash_a && node->hash_b == hash_b)
+            return node->item;
+
+    return default_item;
+}
+
+Boolean hash_table_del(HashTable *ht, SlsStr key) {
+    uint32_t hash_a = sls_hash_a(key);
+    uint32_t hash_b = sls_hash_b(key);
+    size_t bucket_index = hash_a & (ht->buckets_count - 1);
+
+    Bucket *prev = NULL;
+
+    for (Bucket *node = ht->buckets[bucket_index]; node; node = node->next) {
+        if (node->hash_a == hash_a && node->hash_b == hash_b) {
+            if (prev == NULL)
+                ht->buckets[bucket_index] = node->next;
+            else
+                prev->next = node->next;
+            // TODO: Does item need to be freed?
+            free(node);
+            return TRUE;
+        }
+        prev = node;
+    }
+
+    return FALSE;
+}

SLS_C/src/interpreter.c

@@ -0,0 +1,232 @@
+// Kyler Olsen
+// YREA SLS
+// Interpreter
+// November 2025
+
+#include <stdlib.h>
+
+#include "sls/string.h"
+#include "sls/interpreter.h"
+#include "sls/lexer.h"
+#include "sls/hash_table.h"
+#include "sls/builtin.h"
+
+static const size_t HASH_TABLE_BUCKET_COUNT = 256;
+
+const char *STACK_TYPES_NAMES[] = {
+    "Identifier",
+    "64-bit Integer",
+    "32-bit Integer",
+    "16-bit Integer",
+    "8-bit Integer",
+    "64-bit U Integer",
+    "32-bit U Integer",
+    "16-bit U Integer",
+    "8-bit U Integer",
+    "Float",
+    "Double",
+    "Character",
+    "Boolean",
+    "Token String",
+    "Callable",
+};
+
+const char *STACK_TYPES_TYPES[] = {
+    "Identifier",
+    "i64",
+    "i32",
+    "i16",
+    "i8",
+    "u64",
+    "u32",
+    "u16",
+    "u8",
+    "f32",
+    "f64",
+    "char",
+    "bool",
+    "TokenString",
+    "Callable",
+};
+
+const size_t STACK_TYPE_COUNT = sizeof(STACK_TYPES_NAMES) / sizeof(*STACK_TYPES_NAMES);
+
+static inline Boolean hash_table_put_funcs(HashTable *ht, SlsStr key, FunctionItem *item) {
+    return hash_table_put(ht, key, (void *)item);
+}
+
+static inline FunctionItem *hash_table_get_funcs(const HashTable *ht, SlsStr key, FunctionItem *default_item) {
+    return (FunctionItem*)hash_table_get(ht, key, (void *)default_item);
+}
+
+Boolean push_token(InterpreterState *interpreter_state, Token token) {
+    StackType type;
+    switch (token.type) {
+    case TOKEN_EOF:
+        return TRUE;
+    case TOKEN_IDENTIFIER:
+        type = STACK_IDENTIFIER;
+        break;
+    case TOKEN_INTEGER:
+        switch (token.integer_literal.type) {
+        case INTEGER_I64:
+            type = STACK_I64;
+            break;
+        case INTEGER_I32:
+            type = STACK_I32;
+            break;
+        case INTEGER_I16:
+            type = STACK_I16;
+            break;
+        case INTEGER_I8:
+            type = STACK_I8;
+            break;
+        case INTEGER_U64:
+            type = STACK_U64;
+            break;
+        case INTEGER_U32:
+            type = STACK_U32;
+            break;
+        case INTEGER_U16:
+            type = STACK_U16;
+            break;
+        case INTEGER_U8:
+            type = STACK_U8;
+            break;
+        }
+        break;
+    case TOKEN_FLOAT:
+        type = STACK_FLOAT;
+        break;
+    case TOKEN_DOUBLE:
+        type = STACK_DOUBLE;
+        break;
+    case TOKEN_CHARACTER:
+        type = STACK_CHARACTER;
+        break;
+    case TOKEN_STRING:
+        return FALSE;
+    case TOKEN_BOOLEAN:
+        type = STACK_BOOLEAN;
+        break;
+    case TOKEN_ARRAY:
+        return FALSE;
+    case TOKEN_TOKEN_STRING:
+        type = STACK_TOKEN_STRING;
+        break;
+    case TOKEN_TYPE_TUPLE:
+        return FALSE;
+    }
+
+    StackItem *item = (StackItem *)malloc(sizeof(StackItem));
+    if (item == NULL) return FALSE;
+    item->type = type;
+    item->next = interpreter_state->stack;
+    interpreter_state->stack = item;
+
+    switch (type) {
+    case STACK_IDENTIFIER:
+        item->identifier = token.identifier;
+        break;
+    case STACK_I64:
+        item->i64 = (int64_t)token.integer_literal.value;
+        break;
+    case STACK_I32:
+        item->i32 = (int32_t)token.integer_literal.value;
+        break;
+    case STACK_I16:
+        item->i16 = (int16_t)token.integer_literal.value;
+        break;
+    case STACK_I8:
+        item->i8 = (int8_t)token.integer_literal.value;
+        break;
+    case STACK_U64:
+        item->u64 = (uint64_t)token.integer_literal.value;
+        break;
+    case STACK_U32:
+        item->u32 = (uint32_t)token.integer_literal.value;
+        break;
+    case STACK_U16:
+        item->u16 = (uint16_t)token.integer_literal.value;
+        break;
+    case STACK_U8:
+        item->u8 = (uint8_t)token.integer_literal.value;
+        break;
+    case STACK_FLOAT:
+        item->f32 = token.float_literal;
+        break;
+    case STACK_DOUBLE:
+        item->f64 = token.double_literal;
+        break;
+    case STACK_CHARACTER:
+        item->character = token.character_literal;
+        break;
+    case STACK_BOOLEAN:
+        item->boolean = token.boolean_literal;
+        break;
+    case STACK_TOKEN_STRING:
+    case STACK_CALLABLE:
+        item->token_string = copy_token_string(token.token_string);
+        break;
+    }
+
+    return TRUE;
+}
+
+Boolean execute_func(InterpreterState *interpreter_state, SlsStr key) {
+    FunctionItem *func = hash_table_get_funcs(interpreter_state->functions, key, NULL);
+    if (func == NULL) return FALSE;
+    switch (func->type) {
+    case FUNCTION_BUILTIN:
+        return func->builtin(interpreter_state);
+    case FUNCTION_TOKEN_STRING:
+        return execute_token_string(interpreter_state, func->token_string);
+    }
+    return FALSE;
+}
+
+Boolean execute_token_string(InterpreterState *interpreter_state, TokenString token_string) {
+    Boolean return_value = FALSE;
+    for (size_t i = 0; i < token_string.length; i++) {
+        if (token_string.tokens[i].type == TOKEN_IDENTIFIER && !token_string.tokens[i].identifier.is_literal)
+            return_value = execute_func(interpreter_state, token_string.tokens[i].identifier.name);
+        else
+            return_value = push_token(interpreter_state, token_string.tokens[i]);
+        if (!return_value) break;
+    }
+    return return_value;
+}
+
+Boolean execute(InterpreterState *interpreter_state, LexerTokenResult *token) {
+    if (token->result.type == TOKEN_IDENTIFIER && !token->result.identifier.is_literal)
+        return execute_func(interpreter_state, token->result.identifier.name);
+    else
+        return push_token(interpreter_state, token->result);
+}
+
+InterpreterState *interpreter_create() {
+    InterpreterState *interpreter_state = (InterpreterState *)malloc(sizeof(InterpreterState));
+    if (interpreter_state == NULL)
+        return NULL;
+    interpreter_state->stack = NULL;
+    interpreter_state->functions = init_hash_table(HASH_TABLE_BUCKET_COUNT);
+    if (!load_builtins(interpreter_state)) {
+        interpreter_delete(interpreter_state);
+        return NULL;
+    }
+    return interpreter_state;
+}
+
+void clean_stack(StackItem *item) {
+    if (item == NULL) return;
+    if (item->type == STACK_TOKEN_STRING)
+        clean_token_string(item->token_string);
+    clean_stack(item->next);
+    free(item);
+}
+
+void interpreter_delete(InterpreterState *interpreter_state) {
+    clean_stack(interpreter_state->stack);
+    del_hash_table(interpreter_state->functions);
+    free(interpreter_state);
+}

SLS_C/src/lexer.c

@@ -9,8 +9,10 @@
 #include <stddef.h>
 #include <stdlib.h>
 #include <stdio.h>
+#include <math.h>
 
-#include "sls/sls_errors.h"
+#include "sls/errors.h"
+#include "sls/bool.h"
 #include "sls/lexer.h"
 #include "sls/string.h"
 
@@ -22,6 +24,7 @@ const char *TOKEN_TYPES_NAMES[] = {
     "Integer",
     "Float",
     "Double",
+    "Character",
     "String",
     "Boolean",
     "Array",
@@ -29,6 +32,8 @@ const char *TOKEN_TYPES_NAMES[] = {
     "Type Tuple",
 };
 
+const size_t TOKEN_TYPE_COUNT = sizeof(TOKEN_TYPES_NAMES) / sizeof(*TOKEN_TYPES_NAMES);
+
 const char *ARRAY_TYPES_NAMES[] = {
     "Identifier",
     "i64",
@@ -41,11 +46,14 @@ const char *ARRAY_TYPES_NAMES[] = {
     "u8",
     "Float",
     "Double",
+    "Character",
     "String",
     "Boolean",
     "Inline Struct",
 };
 
+const size_t ARRAY_TYPE_COUNT = sizeof(ARRAY_TYPES_NAMES) / sizeof(*ARRAY_TYPES_NAMES);
+
 const char *INTEGER_TYPES_NAMES[] = {
     "i64",
     "i32",
@@ -57,7 +65,9 @@ const char *INTEGER_TYPES_NAMES[] = {
     "u8",
 };
 
-void init_lexer(LexerInfo *lexer_info, const char *filename, const char *source_code) {
+const size_t INTEGER_TYPE_COUNT = sizeof(INTEGER_TYPES_NAMES) / sizeof(*INTEGER_TYPES_NAMES);
+
+void init_lexer(LexerInfo *lexer_info, SlsStr filename, SlsStr source_code) {
     // Initializes a LexerInfo struct with file info and source code
     lexer_info->filename = filename;
     lexer_info->source_code = source_code;
@@ -79,22 +89,27 @@ static FileInfo get_file_info(LexerInfo *lexer_info, size_t start, size_t start_
 
 static const char *get_token_text(LexerInfo *lexer_info, size_t start) {
     // Returns the current character from the source code
-    return lexer_info->source_code + start;
+    return lexer_info->source_code.str + start;
 }
 
 static char peek(LexerInfo *lexer_info) {
     // Returns the current character from the source code
-    return lexer_info->source_code[lexer_info->pos];
+    return lexer_info->source_code.str[lexer_info->pos];
 }
 
 static char far_peek(LexerInfo *lexer_info, size_t index) {
     // Returns the character index away from the current char in the source code
-    return lexer_info->source_code[lexer_info->pos + index];
+    return lexer_info->source_code.str[lexer_info->pos + index];
+}
+
+static char seek(LexerInfo *lexer_info, size_t index) {
+    // Returns the character from the given index from the source code
+    return lexer_info->source_code.str[index];
 }
 
 static char advance(LexerInfo *lexer_info) {
     // Advances lexer_info to the next character
-    if (lexer_info->source_code[lexer_info->pos] == '\n') {
+    if (lexer_info->source_code.str[lexer_info->pos] == '\n') {
         // If a new line is encountered, advance line and reset column
         lexer_info->line++;
         lexer_info->column = 1;
@@ -103,14 +118,14 @@ static char advance(LexerInfo *lexer_info) {
         lexer_info->column++;
     }
     // Advance to and return the next character
-    return lexer_info->source_code[++lexer_info->pos];
+    return lexer_info->source_code.str[++lexer_info->pos];
 }
 
 static LexerResult lexer_result(LexerInfo *lexer_info, Token token, size_t start, size_t start_line) {
     // Create a LexerTokenResult to store the results of lexing the current token
     LexerTokenResult *result = (LexerTokenResult *)malloc(sizeof(LexerTokenResult));
     if (result == NULL)
-        return (LexerResult){SLS_ERROR, .error = (SlsError){"Failed to allocate memory.", 1}};
+        return (LexerResult){SLS_ERROR, .error = (SlsError){SLS_STR("Failed to allocate memory."), 1}};
     result->type = SLS_RESULT;
     result->result = token;
     result->file_info = get_file_info(lexer_info, start, start_line);
@@ -118,11 +133,11 @@ static LexerResult lexer_result(LexerInfo *lexer_info, Token token, size_t start
     return (LexerResult){SLS_RESULT, .result = result};
 }
 
-static LexerResult lexer_error(LexerInfo *lexer_info, const char* message, size_t start, size_t start_line) {
+static LexerResult lexer_error(LexerInfo *lexer_info, SlsStr message, size_t start, size_t start_line) {
     // Create a LexerTokenResult to store an error from lexing the current token
     LexerTokenResult *result = (LexerTokenResult *)malloc(sizeof(LexerTokenResult));
     if (result == NULL)
-        return (LexerResult){SLS_ERROR, .error = (SlsError){"Failed to allocate memory.", 1}};
+        return (LexerResult){SLS_ERROR, .error = (SlsError){SLS_STR("Failed to allocate memory."), 1}};
     result->type = SLS_ERROR;
     result->error.message = message;
     result->error.code = 1;
@@ -190,7 +205,7 @@ static IntegerTypeResult get_integer_type(NumericTypes numeric_type) {
         integer_type = INTEGER_U8;
         break;
     default:
-        return (IntegerTypeResult){SLS_ERROR, .error = (SlsError){.message = "Lexer Error: Encountered a Float where there should not be one.", .code = 1}};
+        return (IntegerTypeResult){SLS_ERROR, .error = (SlsError){SLS_STR("Lexer Error: Encountered a Float where there should not be one."), 1}};
     }
     return (IntegerTypeResult){SLS_RESULT, .integer_type = integer_type};
 }
@@ -212,7 +227,8 @@ static uint64_t create_binary_integer(LexerInfo *lexer_info, size_t start) {
             case '1': value += 1; break;
         }
     }
-    return value * (negative ? -1 : 1);
+    if (negative) value = (~value) + 1;
+    return value;
 }
 
 static uint64_t create_octal_integer(LexerInfo *lexer_info, size_t start) {
@@ -238,7 +254,8 @@ static uint64_t create_octal_integer(LexerInfo *lexer_info, size_t start) {
             case '7': value += 7; break;
         }
     }
-    return value * (negative ? -1 : 1);
+    if (negative) value = (~value) + 1;
+    return value;
 }
 
 static uint64_t create_decimal_integer(LexerInfo *lexer_info, size_t start) {
@@ -252,7 +269,7 @@ static uint64_t create_decimal_integer(LexerInfo *lexer_info, size_t start) {
     }
     for (; i < lexer_info->pos - start; i++) {
         if (isspace(token[i]) || token[i] == '/' || token[i] == '\0' || token[i] == ':') break;
-        if (token[i] == '.' || token[i] == '_') continue;
+        if (token[i] == '_') continue;
         value *= 10;
         switch (token[i]) {
             case '1': value += 1; break;
@@ -266,7 +283,8 @@ static uint64_t create_decimal_integer(LexerInfo *lexer_info, size_t start) {
             case '9': value += 9; break;
         }
     }
-    return value * (negative ? -1 : 1);
+    if (negative) value = (~value) + 1;
+    return value;
 }
 
 static uint64_t create_hexadecimal_integer(LexerInfo *lexer_info, size_t start) {
@@ -306,7 +324,99 @@ static uint64_t create_hexadecimal_integer(LexerInfo *lexer_info, size_t start)
             case 'f': value += 15; break;
         }
     }
-    return value * (negative ? -1 : 1);
+    if (negative) value = (~value) + 1;
+    return value;
+}
+
+static LexerResult create_integer_token(LexerInfo *lexer_info, IntegerBuiltInType type, uint64_t value, size_t start, size_t start_line) {
+    switch (type) {
+    case INTEGER_I64: break;
+    case INTEGER_I32:
+        if ((int64_t)value < INT32_MIN || (int64_t)value > INT32_MAX) {
+            return lexer_error(lexer_info, SLS_STR("Integer overflow: value exceeds range for i32."), start, start_line);
+        }
+        break;
+    case INTEGER_I16:
+        if ((int64_t)value < INT16_MIN || (int64_t)value > INT16_MAX) {
+            return lexer_error(lexer_info, SLS_STR("Integer overflow: value exceeds range for i16."), start, start_line);
+        }
+        break;
+    case INTEGER_I8:
+        if ((int64_t)value < INT8_MIN || (int64_t)value > INT8_MAX) {
+            return lexer_error(lexer_info, SLS_STR("Integer overflow: value exceeds range for i8."), start, start_line);
+        }
+        break;
+    case INTEGER_U64:
+        if (seek(lexer_info, start) == '-') {
+            return lexer_error(lexer_info, SLS_STR("Integer overflow: value exceeds range for u64."), start, start_line);
+        }
+        break;
+    case INTEGER_U32:
+        if (seek(lexer_info, start) == '-') {
+            return lexer_error(lexer_info, SLS_STR("Integer overflow: value exceeds range for u32."), start, start_line);
+        } else if (value > (uint64_t)UINT32_MAX) {
+            return lexer_error(lexer_info, SLS_STR("Integer overflow: value exceeds range for u32."), start, start_line);
+        }
+        break;
+    case INTEGER_U16:
+        if (seek(lexer_info, start) == '-') {
+            return lexer_error(lexer_info, SLS_STR("Integer overflow: value exceeds range for u16."), start, start_line);
+        } else if (value > (uint64_t)UINT16_MAX) {
+            return lexer_error(lexer_info, SLS_STR("Integer overflow: value exceeds range for u16."), start, start_line);
+        }
+        break;
+    case INTEGER_U8:
+        if (seek(lexer_info, start) == '-') {
+            return lexer_error(lexer_info, SLS_STR("Integer overflow: value exceeds range for u8."), start, start_line);
+        } else if (value > (uint64_t)UINT8_MAX) {
+            return lexer_error(lexer_info, SLS_STR("Integer overflow: value exceeds range for u8."), start, start_line);
+        }
+        break;
+    }
+    return lexer_result(lexer_info, (Token){TOKEN_INTEGER, .integer_literal = (IntegerLiteral){.type = type, .value = value}}, start, start_line);
+}
+
+static double create_float(LexerInfo *lexer_info, size_t start) {
+    double value = 0;
+    Boolean negative = FALSE;
+    uint64_t fractional = 0;
+    const char *token = get_token_text(lexer_info, start);
+    size_t i = 0;
+    if (token[0] == '-') {
+        negative = TRUE;
+        i += 1;
+    }
+    for (; i < lexer_info->pos - start; i++) {
+        if (isspace(token[i]) || token[i] == '/' || token[i] == '\0' || token[i] == ':') break;
+        if (token[i] == '_') continue;
+        if (token[i] == '.') {
+            fractional = 1;
+            continue;
+        }
+        if (fractional == 0) value *= 10;
+        else fractional *= 10;
+        switch (token[i]) {
+            case '1': value += 1.0 / (fractional == 0 ? 1 : fractional); break;
+            case '2': value += 2.0 / (fractional == 0 ? 1 : fractional); break;
+            case '3': value += 3.0 / (fractional == 0 ? 1 : fractional); break;
+            case '4': value += 4.0 / (fractional == 0 ? 1 : fractional); break;
+            case '5': value += 5.0 / (fractional == 0 ? 1 : fractional); break;
+            case '6': value += 6.0 / (fractional == 0 ? 1 : fractional); break;
+            case '7': value += 7.0 / (fractional == 0 ? 1 : fractional); break;
+            case '8': value += 8.0 / (fractional == 0 ? 1 : fractional); break;
+            case '9': value += 9.0 / (fractional == 0 ? 1 : fractional); break;
+        }
+    }
+    if (negative) value = -value;
+    return value;
+}
+
+static LexerResult create_float_token(LexerInfo *lexer_info, NumericTypes type, size_t start, size_t start_line) {
+    double value = create_float(lexer_info, start);
+    if (type == NUMERIC_F64)
+        return lexer_result(lexer_info, (Token){TOKEN_DOUBLE, .double_literal = value}, start, start_line);
+    else
+        return lexer_result(lexer_info, (Token){TOKEN_FLOAT, .float_literal = (float){value}}, start, start_line);
 }
 
 typedef enum {
@@ -334,16 +444,14 @@ static LexerResult parse_numeric_type(LexerInfo *lexer_info, char c, size_t star
                 c = advance(lexer_info);
                 c = advance(lexer_info);
             } else {
-                char *error_message = (char *)malloc(sizeof(char) * 52);
-                strncpy(error_message, "Invalid float type: must be of type 'f64' or 'f32'.", 52);
-                return lexer_error(lexer_info, error_message, start, start_line);
+                return lexer_error(lexer_info, SLS_STR("Invalid float type: must be of type 'f64' or 'f32'."), start, start_line);
             }
         } else {
-            char *error_message = (char *)malloc(sizeof(char) * 49);
-            strncpy(error_message, "Invalid numeric literal: float type not allowed.", 49);
-            return lexer_error(lexer_info, error_message, start, start_line);
+            return lexer_error(lexer_info, SLS_STR("Invalid numeric literal: float type not allowed."), start, start_line);
         }
     } else if (c == 'i' || c == 'u') {
+        if (numeric_literal_type == NUMERIC_FLOAT || numeric_literal_type == NUMERIC_EXPONENTIAL)
+            return lexer_error(lexer_info, SLS_STR("Invalid float type: must be of type 'f64' or 'f32'."), start, start_line);
         if (c == 'u') numeric_type |= NUMERIC_UNSIGNED;
         c = advance(lexer_info);
         if (c == '6' && far_peek(lexer_info, 1) == '4') {
@@ -363,24 +471,16 @@ static LexerResult parse_numeric_type(LexerInfo *lexer_info, char c, size_t star
             c = advance(lexer_info);
         } else {
             if (numeric_type & NUMERIC_UNSIGNED) {
-                char *error_message = (char *)malloc(sizeof(char) * 78);
-                strncpy(error_message, "Invalid unsigned integer type: must be of type 'u64', 'u32', 'u16', and 'u8'.", 78);
-                return lexer_error(lexer_info, error_message, start, start_line);
+                return lexer_error(lexer_info, SLS_STR("Invalid unsigned integer type: must be of type 'u64', 'u32', 'u16', and 'u8'."), start, start_line);
             } else {
-                char *error_message = (char *)malloc(sizeof(char) * 76);
-                strncpy(error_message, "Invalid signed integer type: must be of type 'i64', 'i32', 'i16', and 'i8'.", 76);
-                return lexer_error(lexer_info, error_message, start, start_line);
+                return lexer_error(lexer_info, SLS_STR("Invalid signed integer type: must be of type 'i64', 'i32', 'i16', and 'i8'."), start, start_line);
             }
         }
     } else {
         if (numeric_literal_type == NUMERIC_DECIMAL || numeric_literal_type == NUMERIC_FLOAT || numeric_literal_type == NUMERIC_EXPONENTIAL) {
-            char *error_message = (char *)malloc(sizeof(char) * 61);
-            strncpy(error_message, "Invalid numeric type: type must start with 'f', 'i', or 'u'.", 61);
-            return lexer_error(lexer_info, error_message, start, start_line);
+            return lexer_error(lexer_info, SLS_STR("Invalid numeric type: type must start with 'f', 'i', or 'u'."), start, start_line);
         } else {
-            char *error_message = (char *)malloc(sizeof(char) * 55);
-            strncpy(error_message, "Invalid integer type: type must start with 'i' or 'u'.", 55);
-            return lexer_error(lexer_info, error_message, start, start_line);
+            return lexer_error(lexer_info, SLS_STR("Invalid integer type: type must start with 'i' or 'u'."), start, start_line);
         }
     } if (isspace(c) || c == '/' || c == '\0') {
         IntegerTypeResult integer_type = get_integer_type(numeric_type);
@@ -391,142 +491,369 @@ static LexerResult parse_numeric_type(LexerInfo *lexer_info, char c, size_t star
         case NUMERIC_BINARY:
             if (integer_type.type == SLS_ERROR) return (LexerResult){SLS_ERROR, .error = integer_type.error};
             value = create_binary_integer(lexer_info, start);
-            return lexer_result(lexer_info, (Token){TOKEN_INTEGER, .integer_literal = (IntegerLiteral){.type = integer_type.integer_type, .value = value}}, start, start_line);
+            return create_integer_token(lexer_info, integer_type.integer_type, value, start, start_line);
         case NUMERIC_OCTAL:
             if (integer_type.type == SLS_ERROR) return (LexerResult){SLS_ERROR, .error = integer_type.error};
             value = create_octal_integer(lexer_info, start);
-            return lexer_result(lexer_info, (Token){TOKEN_INTEGER, .integer_literal = (IntegerLiteral){.type = integer_type.integer_type, .value = value}}, start, start_line);
+            return create_integer_token(lexer_info, integer_type.integer_type, value, start, start_line);
         case NUMERIC_DECIMAL:
             if (integer_type.type == SLS_ERROR) return (LexerResult){SLS_ERROR, .error = integer_type.error};
             value = create_decimal_integer(lexer_info, start);
-            return lexer_result(lexer_info, (Token){TOKEN_INTEGER, .integer_literal = (IntegerLiteral){.type = integer_type.integer_type, .value = value}}, start, start_line);
+            return create_integer_token(lexer_info, integer_type.integer_type, value, start, start_line);
         case NUMERIC_HEXADECIMAL:
             if (integer_type.type == SLS_ERROR) return (LexerResult){SLS_ERROR, .error = integer_type.error};
             value = create_hexadecimal_integer(lexer_info, start);
-            return lexer_result(lexer_info, (Token){TOKEN_INTEGER, .integer_literal = (IntegerLiteral){.type = integer_type.integer_type, .value = value}}, start, start_line);
+            return create_integer_token(lexer_info, integer_type.integer_type, value, start, start_line);
         case NUMERIC_FLOAT:
-            break;
+            return create_float_token(lexer_info, numeric_type, start, start_line);
         case NUMERIC_EXPONENTIAL:
             break;
         }
-        return (LexerResult){SLS_ERROR, .error = (SlsError){"Lexer: Numeric Literal Not Implemented Error.", 1}};
+        return (LexerResult){SLS_ERROR, .error = (SlsError){SLS_STR("Lexer: Numeric Literal Not Implemented Error."), 1}};
     }
-    char *error_message = (char *)malloc(sizeof(char) * 57);
-    snprintf(error_message, 57, "Invalid numeric literal: unexpected '%c' in numeric type.", c);
-    return lexer_error(lexer_info, error_message, start, start_line);
+    SlsStr error_msg = sls_format(SLS_STR("Invalid numeric literal: unexpected '%c' in numeric type."), c);
+    if (error_msg.str == NULL) return (LexerResult){SLS_ERROR, .error = (SlsError){SLS_STR("Out Of Memory Error."), 1}};
+    return lexer_error(lexer_info, error_msg, start, start_line);
 }
 
 static LexerResult parse_binary_integer(LexerInfo *lexer_info, char c, size_t start, size_t start_line) {
-    do {c = advance(lexer_info);} while (c == '0' || c == '1' || c == '_');
+    while (c == '0' || c == '1' || c == '_') c = advance(lexer_info);
     if (c == ':') return parse_numeric_type(lexer_info, c, start, start_line, NUMERIC_BINARY);
     if (isspace(c) || c == '/' || c == '\0') {
         uint64_t value = create_binary_integer(lexer_info, start);
-        return lexer_result(lexer_info, (Token){TOKEN_INTEGER, .integer_literal = (IntegerLiteral){.type = INTEGER_I64, .value = value}}, start, start_line);
+        return create_integer_token(lexer_info, SLS_INTEGER_TYPE_DEFAULT, value, start, start_line);
     }
-    char *error_message = (char *)malloc(sizeof(char) * 58);
-    snprintf(error_message, 58, "Invalid binary literal: unexpected '%c' in binary integer.", c);
-    return lexer_error(lexer_info, error_message, start, start_line);
+    SlsStr error_msg = sls_format(SLS_STR("Invalid binary literal: unexpected '%c' in binary integer."), c);
+    if (error_msg.str == NULL) return (LexerResult){SLS_ERROR, .error = (SlsError){SLS_STR("Out Of Memory Error."), 1}};
+    return lexer_error(lexer_info, error_msg, start, start_line);
 }
 
 static LexerResult parse_octal_integer(LexerInfo *lexer_info, char c, size_t start, size_t start_line) {
-    do {c = advance(lexer_info);} while ((isdigit(c) || c == '_') && !(c == '8' || c == '9'));
+    while ((isdigit(c) || c == '_') && !(c == '8' || c == '9')) c = advance(lexer_info);
     if (c == ':') return parse_numeric_type(lexer_info, c, start, start_line, NUMERIC_OCTAL);
     if (isspace(c) || c == '/' || c == '\0') {
         uint64_t value = create_octal_integer(lexer_info, start);
-        return lexer_result(lexer_info, (Token){TOKEN_INTEGER, .integer_literal = (IntegerLiteral){.type = INTEGER_I64, .value = value}}, start, start_line);
+        return create_integer_token(lexer_info, SLS_INTEGER_TYPE_DEFAULT, value, start, start_line);
     }
-    char *error_message = (char *)malloc(sizeof(char) * 56);
-    snprintf(error_message, 56, "Invalid octal literal: unexpected '%c' in octal integer.", c);
-    return lexer_error(lexer_info, error_message, start, start_line);
+    SlsStr error_msg = sls_format(SLS_STR("Invalid octal literal: unexpected '%c' in octal integer."), c);
+    if (error_msg.str == NULL) return (LexerResult){SLS_ERROR, .error = (SlsError){SLS_STR("Out Of Memory Error."), 1}};
+    return lexer_error(lexer_info, error_msg, start, start_line);
 }
 
 static LexerResult parse_exponential(LexerInfo *lexer_info, char c, size_t start, size_t start_line) {
     (void)lexer_info; (void)c; (void)start; (void)start_line;
-    return (LexerResult){SLS_ERROR, .error = (SlsError){"Lexer: Float Exponential Not Implemented Error.", 1}};
+    return (LexerResult){SLS_ERROR, .error = (SlsError){SLS_STR("Lexer: Float Exponential Not Implemented Error."), 1}};
 }
 
 static LexerResult parse_float(LexerInfo *lexer_info, char c, size_t start, size_t start_line) {
-    (void)lexer_info; (void)c; (void)start; (void)start_line;
-    return (LexerResult){SLS_ERROR, .error = (SlsError){"Lexer: Float Not Implemented Error.", 1}};
+    while (isdigit(c) || c == '_') c = advance(lexer_info);
+    if (c == 'e' || c == 'E') return parse_exponential(lexer_info, c, start, start_line);
+    if (c == ':') return parse_numeric_type(lexer_info, c, start, start_line, NUMERIC_FLOAT);
+    if (isspace(c) || c == '/' || c == '\0')
+        return create_float_token(lexer_info, SLS_FLOAT_TYPE_DEFAULT, start, start_line);
+    SlsStr error_msg = sls_format(SLS_STR("Invalid float literal: unexpected '%c' in float."), c);
+    if (error_msg.str == NULL) return (LexerResult){SLS_ERROR, .error = (SlsError){SLS_STR("Out Of Memory Error."), 1}};
+    return lexer_error(lexer_info, error_msg, start, start_line);
 }
 
 static LexerResult parse_decimal_integer(LexerInfo *lexer_info, char c, size_t start, size_t start_line) {
-    do {c = advance(lexer_info);} while (isdigit(c) || c == '_');
-    if (c == '.') return parse_float(lexer_info, c, start, start_line);
-    if (c == 'e' || c == 'E') return parse_exponential(lexer_info, c, start, start_line);
+    while (isdigit(c) || c == '_') c = advance(lexer_info);
+    if (c == '.') {
+        c = advance(lexer_info);
+        return parse_float(lexer_info, c, start, start_line);
+    } if (c == 'e' || c == 'E') return parse_exponential(lexer_info, c, start, start_line);
     if (c == ':') return parse_numeric_type(lexer_info, c, start, start_line, NUMERIC_DECIMAL);
     if (isspace(c) || c == '/' || c == '\0') {
         uint64_t value = create_decimal_integer(lexer_info, start);
-        return lexer_result(lexer_info, (Token){TOKEN_INTEGER, .integer_literal = (IntegerLiteral){.type = INTEGER_I64, .value = value}}, start, start_line);
+        return create_integer_token(lexer_info, SLS_INTEGER_TYPE_DEFAULT, value, start, start_line);
     }
-    char *error_message = (char *)malloc(sizeof(char) * 60);
-    snprintf(error_message, 60, "Invalid decimal literal: unexpected '%c' in decimal integer.", c);
-    return lexer_error(lexer_info, error_message, start, start_line);
+    SlsStr error_msg = sls_format(SLS_STR("Invalid decimal literal: unexpected '%c' in decimal integer."), c);
+    if (error_msg.str == NULL) return (LexerResult){SLS_ERROR, .error = (SlsError){SLS_STR("Out Of Memory Error."), 1}};
+    return lexer_error(lexer_info, error_msg, start, start_line);
 }
 
 static LexerResult parse_hexadecimal_integer(LexerInfo *lexer_info, char c, size_t start, size_t start_line) {
-    do {c = advance(lexer_info);} while (isxdigit(c) || c == '_');
+    while (isxdigit(c) || c == '_') c = advance(lexer_info);
     if (c == ':') return parse_numeric_type(lexer_info, c, start, start_line, NUMERIC_HEXADECIMAL);
     if (isspace(c) || c == '/' || c == '\0') {
         uint64_t value = create_hexadecimal_integer(lexer_info, start);
-        return lexer_result(lexer_info, (Token){TOKEN_INTEGER, .integer_literal = (IntegerLiteral){.type = INTEGER_I64, .value = value}}, start, start_line);
+        return create_integer_token(lexer_info, SLS_INTEGER_TYPE_DEFAULT, value, start, start_line);
     }
-    char *error_message = (char *)malloc(sizeof(char) * 68);
-    snprintf(error_message, 68, "Invalid hexadecimal literal: unexpected '%c' in hexadecimal integer.", c);
-    return lexer_error(lexer_info, error_message, start, start_line);
+    SlsStr error_msg = sls_format(SLS_STR("Invalid hexadecimal literal: unexpected '%c' in hexadecimal integer."), c);
+    if (error_msg.str == NULL) return (LexerResult){SLS_ERROR, .error = (SlsError){SLS_STR("Out Of Memory Error."), 1}};
+    return lexer_error(lexer_info, error_msg, start, start_line);
 }
 
 static LexerResult parse_numeric_literal(LexerInfo *lexer_info, char c, size_t start, size_t start_line) {
     if (c == '-') c = advance(lexer_info);
     if (c == '0') {
         c = advance(lexer_info);
-        if (c == 'b' || c == 'B') return parse_binary_integer(lexer_info, c, start, start_line);
-        else if (c == 'o' || c == 'O') return parse_octal_integer(lexer_info, c, start, start_line);
-        else if (c == 'x' || c == 'X') return parse_hexadecimal_integer(lexer_info, c, start, start_line);
+        if (c == 'b' || c == 'B') {
+            c = advance(lexer_info);
+            return parse_binary_integer(lexer_info, c, start, start_line);
+        } else if (c == 'o' || c == 'O') {
+            c = advance(lexer_info);
+            return parse_octal_integer(lexer_info, c, start, start_line);
+        } else if (c == 'x' || c == 'X') {
+            c = advance(lexer_info);
+            return parse_hexadecimal_integer(lexer_info, c, start, start_line);
+        }
     }
     return parse_decimal_integer(lexer_info, c, start, start_line);
 }
 
 static LexerResult parse_character_literal(LexerInfo *lexer_info, char c, size_t start, size_t start_line) {
-    (void)lexer_info; (void)c; (void)start; (void)start_line;
-    return (LexerResult){SLS_ERROR, .error = (SlsError){"Lexer: Character Literals Not Implemented Error.", 1}};
+    if (c == '\'')
+        return lexer_error(lexer_info, SLS_STR("Invalid character literal: empty character literal."), start, start_line);
+    char value = '\0';
+    if (c == '\\') {
+        c = advance(lexer_info);
+        switch (c) {
+        case 'n':
+            value = '\n';
+            break;
+        case 'r':
+            value = '\r';
+            break;
+        case 't':
+            value = '\t';
+            break;
+        case '\\':
+            value = '\\';
+            break;
+        case '\'':
+            value = '\'';
+            break;
+        case '0':
+            value = '\0';
+            break;
+        default:
+            SlsStr error_msg = sls_format(SLS_STR("Invalid character literal: unknown escape sequence '\\%c'."), c);
+            if (error_msg.str == NULL) return (LexerResult){SLS_ERROR, .error = (SlsError){SLS_STR("Out Of Memory Error."), 1}};
+            return lexer_error(lexer_info, error_msg, start, start_line);
+        }
+    } else if (c == '\n' || c == '\r')
+        return lexer_error(lexer_info, SLS_STR("Invalid character literal: unclosed character literal."), start, start_line);
+    else value = c;
+    c = advance(lexer_info);
+    if (isspace(c) || c == '/' || c == '\0')
+        return lexer_error(lexer_info, SLS_STR("Invalid character literal: unclosed character literal."), start, start_line);
+    else if (c != '\'') {
+        SlsStr error_msg = sls_format(SLS_STR("Invalid character literal: unexpected '%c' in character."), c);
+        if (error_msg.str == NULL) return (LexerResult){SLS_ERROR, .error = (SlsError){SLS_STR("Out Of Memory Error."), 1}};
+        return lexer_error(lexer_info, error_msg, start, start_line);
+    }
+    advance(lexer_info);
+    return lexer_result(lexer_info, (Token){TOKEN_CHARACTER, .character_literal = (uint8_t){value}}, start, start_line);
 }
 
 static LexerResult parse_string_literal(LexerInfo *lexer_info, char c, size_t start, size_t start_line) {
     (void)lexer_info; (void)c; (void)start; (void)start_line;
-    return (LexerResult){SLS_ERROR, .error = (SlsError){"Lexer: String Literals Not Implemented Error.", 1}};
+    return (LexerResult){SLS_ERROR, .error = (SlsError){SLS_STR("Lexer: String Literals Not Implemented Error."), 1}};
+}
+
+static void skip_comments_and_whitespace(LexerInfo *lexer_info) {
+    while (isspace(peek(lexer_info)) || (peek(lexer_info) == '/' && far_peek(lexer_info, 1) == '/') || peek(lexer_info) == '#') {
+        // Skip Comments
+        if ((peek(lexer_info) == '/' && far_peek(lexer_info, 1) == '/') || peek(lexer_info) == '#')
+            while (!(peek(lexer_info) == '\n' || peek(lexer_info) == '\0'))
+                advance(lexer_info);
+        // Skip whitespace
+        while (isspace(peek(lexer_info))) advance(lexer_info);
+    }
+}
+
+static LexerResult lexer_next(LexerInfo *lexer_info);
+
+TokenString copy_token_string(TokenString token_string) {
+    TokenString new_string = (TokenString){
+        .length = token_string.length,
+        .tokens = (Token *)malloc(sizeof(Token) * token_string.length)
+    };
+
+    for (size_t i = 0; i < token_string.length; i++) {
+        if (token_string.tokens[i].type == TOKEN_STRING) {
+            new_string.tokens[i].type = TOKEN_STRING;
+            new_string.tokens[i].string_literal = sls_str_cpy(token_string.tokens[i].string_literal);
+        } else if (token_string.tokens[i].type == TOKEN_TOKEN_STRING) {
+            new_string.tokens[i].type = TOKEN_TOKEN_STRING;
+            new_string.tokens[i].token_string = copy_token_string(token_string.tokens[i].token_string);
+        } else {
+            new_string.tokens[i] = token_string.tokens[i];
+        }
+    }
+    return new_string;
+}
+
+static LexerResult convert_to_token_string(LexerInfo *lexer_info, LexerTokenResult *head, size_t start, size_t start_line) {
+    TokenString token_string = {
+        .length = 0,
+        .tokens = NULL
+    };
+    LexerTokenResult *current = head;
+
+    while (current != NULL) {
+        token_string.length += 1;
+        current = current->next;
+    }
+
+    current = head;
+    token_string.tokens = (Token *)malloc(sizeof(Token) * token_string.length);
+
+    for (size_t i = 0; i < token_string.length; i++) {
+        if (current->result.type == TOKEN_STRING) {
+            token_string.tokens[i].type = TOKEN_STRING;
+            token_string.tokens[i].string_literal = sls_str_cpy(current->result.string_literal);
+        } else if (current->result.type == TOKEN_TOKEN_STRING) {
+            token_string.tokens[i].type = TOKEN_TOKEN_STRING;
+            token_string.tokens[i].token_string = copy_token_string(current->result.token_string);
+            memcpy(token_string.tokens[i].token_string.tokens, current->result.token_string.tokens, current->result.token_string.length);
+        } else token_string.tokens[i] = current->result;
+        current = current->next;
+    }
+
+    clean_token_result(head);
+
+    return lexer_result(lexer_info, (Token){TOKEN_TOKEN_STRING, .token_string = token_string}, start, start_line);
 }
 
 static LexerResult parse_token_string(LexerInfo *lexer_info, char c, size_t start, size_t start_line) {
-    (void)lexer_info; (void)c; (void)start; (void)start_line;
-    return (LexerResult){SLS_ERROR, .error = (SlsError){"Lexer: Token Strings Not Implemented Error.", 1}};
+    // Lexes a token string
+    LexerResult result; // For lexer_next returns
+    LexerTokenResult *head = 0;
+    LexerTokenResult *current = 0;
+
+    size_t watchdog = 0;
+
+    c = advance(lexer_info);
+    while (c != '\0') {
+        skip_comments_and_whitespace(lexer_info);
+        c = peek(lexer_info);
+
+        // Stop at the end of the token string
+        if (c == '}') {
+            advance(lexer_info);
+            return convert_to_token_string(lexer_info, head, start, start_line);
+        }
+
+        // Get next token
+        result = lexer_next(lexer_info);
+
+        // Handle Errors
+        if (result.type == SLS_ERROR) {
+            clean_token_result(head);
+            return result;
+        }
+
+        // Save result
+        if (head == 0) {
+            head = result.result;
+            current = head;
+        } else {
+            current->next = result.result;
+            current = current->next;
+        }
+
+        // Current should not be null_ptr
+        if (current == 0) {
+            clean_token_result(head);
+            return (LexerResult){SLS_ERROR, .error = (SlsError){SLS_STR("Unknown Error."), 1}};
+        }
+
+        if (current->type == SLS_ERROR) {
+            LexerTokenResult *e = (LexerTokenResult *)malloc(sizeof(LexerTokenResult));
+            *e = (LexerTokenResult){
+                .type = SLS_ERROR,
+                .error = (SlsError){sls_str_cpy(current->error.message), 1},
+                .file_info = current->file_info,
+                .next = NULL
+            };
+            clean_token_result(head);
+            return (LexerResult){SLS_RESULT, .result = e};
+        }
+        if (current->result.type == TOKEN_EOF) break;
+
+        c = peek(lexer_info);
+
+        if (watchdog++ > 1000000) {
+            clean_token_result(head);
+            return (LexerResult){SLS_ERROR, .error = (SlsError){SLS_STR("Watchdog Triggered in Token String."), 1}};
+        }
+    }
+    clean_token_result(head);
+    return lexer_error(lexer_info, SLS_STR("Unclosed token string: missing closing brace '}'."), start, start_line);
 }
 
 static LexerResult parse_array_literal(LexerInfo *lexer_info, char c, size_t start, size_t start_line) {
     (void)lexer_info; (void)c; (void)start; (void)start_line;
-    return (LexerResult){SLS_ERROR, .error = (SlsError){"Lexer: Array Literals Not Implemented Error.", 1}};
+    return (LexerResult){SLS_ERROR, .error = (SlsError){SLS_STR("Lexer: Array Literals Not Implemented Error."), 1}};
 }
 
 static LexerResult parse_type_tuples(LexerInfo *lexer_info, char c, size_t start, size_t start_line) {
     (void)lexer_info; (void)c; (void)start; (void)start_line;
-    return (LexerResult){SLS_ERROR, .error = (SlsError){"Lexer: Type Tuples Not Implemented Error.", 1}};
+    return (LexerResult){SLS_ERROR, .error = (SlsError){SLS_STR("Lexer: Type Tuples Not Implemented Error."), 1}};
+}
+
+Boolean is_identifier_continue(LexerInfo *lexer_info, char c) {
+    // If the current character and its context are a valid identifier character
+    if (!isprint(c)) return FALSE;
+    if (c == '/' && far_peek(lexer_info, 1) == '/') return FALSE;
+    if (c == '{' || c == '}') return FALSE;
+    if (c == '[' || c == ']') return FALSE;
+    if (c == '(' || c == ')') return FALSE;
+    if (c == '\'' || c == '"' || c == '#') return FALSE;
+    if (isspace(c) || c == '\0') return FALSE;
+    return TRUE;
+}
+
+Boolean is_identifier_start(LexerInfo *lexer_info) {
+    // If the current character and its context are a valid identifier start
+    char c = peek(lexer_info);
+    if (c == ':' && far_peek(lexer_info, 1) == ':') c = far_peek(lexer_info, 2);
+    if ((!isdigit(c)) && is_identifier_continue(lexer_info, c)) return TRUE;
+    else return FALSE;
 }
 
 static LexerResult parse_identifiers_and_booleans(LexerInfo *lexer_info, char c, size_t start, size_t start_line) {
-    (void)lexer_info; (void)c; (void)start; (void)start_line;
-    return (LexerResult){SLS_ERROR, .error = (SlsError){"Lexer: Identifiers and Booleans Not Implemented Error.", 1}};
+    // Parses identifier, identifier literals, and boolean tokens
+
+    Boolean literal = FALSE;
+    // Skip leading `::` for identifier literals
+    if (c == ':' && far_peek(lexer_info, 1) == ':') {
+        literal = TRUE;
+        c = advance(lexer_info);
+        c = advance(lexer_info);
+    }
+
+    // Read the name of the identifier
+    size_t length = 0;
+    while (is_identifier_continue(lexer_info, c)) {
+        if (c == ':') // && !literal)
+            return lexer_error(lexer_info, SLS_STR("Invalid identifier: ':' is not allowed in identifiers."), start, start_line);
+        if (c == '.') // && !literal)
+            return lexer_error(lexer_info, SLS_STR("Invalid identifier: '.' is not allowed in identifiers."), start, start_line);
+        c = advance(lexer_info);
+        length++;
+    }
+    char *name_value = (char *)calloc(length+1, sizeof(char));
+    for (size_t i = 0; i < length; i++)
+        name_value[i] = lexer_info->source_code.str[start + i + (2 * literal)];
+    SlsStr name = sls_str_malloc(name_value, length);
+    free(name_value);
+
+    // Return as identifier or boolean tokens
+    if (sls_str_cmp(name, SLS_STR("false")) == 0)
+        return lexer_result(lexer_info, (Token){TOKEN_BOOLEAN, .boolean_literal = FALSE}, start, start_line);
+    else if (sls_str_cmp(name, SLS_STR("true")) == 0)
+        return lexer_result(lexer_info, (Token){TOKEN_BOOLEAN, .boolean_literal = TRUE}, start, start_line);
+    else
+        return lexer_result(lexer_info, (Token){TOKEN_IDENTIFIER, .identifier = (Identifier){.is_literal = literal, .name = name}}, start, start_line);
 }
 
 static LexerResult lexer_next(LexerInfo *lexer_info) {
     // Gets the next token from the source
 
-    while (isspace(peek(lexer_info)) || peek(lexer_info) == '/' || peek(lexer_info) == '#') {
-        // Skip Comments
-        if ((peek(lexer_info) == '/' && far_peek(lexer_info, 1) == '/') || peek(lexer_info) == '#')
-            while (peek(lexer_info) != '\n') advance(lexer_info);
-        // Skip whitespace
-        while (isspace(peek(lexer_info))) advance(lexer_info);
-    }
+    skip_comments_and_whitespace(lexer_info);
 
     // Initialize begining variables
     char c = peek(lexer_info);
@@ -536,32 +863,75 @@ static LexerResult lexer_next(LexerInfo *lexer_info) {
     // End of file tokens
     if (c == '\0') return lexer_result(lexer_info, (Token){.type = TOKEN_EOF}, start, start_line);
     // Integers and Floats
-    if (isdigit(c) || c == '.' || (c == '-' && isdigit(far_peek(lexer_info, 1)))) return parse_numeric_literal(lexer_info, c, start, start_line);
+    if (isdigit(c) || (c == '.' && isdigit(far_peek(lexer_info, 1))) || (c == '-' && isdigit(far_peek(lexer_info, 1))))
+        return parse_numeric_literal(lexer_info, c, start, start_line);
     // Character Literals
-    if (c == '\'') return parse_character_literal(lexer_info, c, start, start_line);
+    if (c == '\'') {
+        c = advance(lexer_info);
+        return parse_character_literal(lexer_info, c, start, start_line);
+    }
     // String Literals
     if (c == '\"') return parse_string_literal(lexer_info, c, start, start_line);
     // Token Strings
     if (c == '{') return parse_token_string(lexer_info, c, start, start_line);
+    if (c == '}') {
+        advance(lexer_info);
+        return lexer_error(lexer_info, SLS_STR("Unexpected closing brace '}' without matching opening brace."), start, start_line);
+    }
     // Array Literals
     if (c == '[') return parse_array_literal(lexer_info, c, start, start_line);
+    if (c == ']') {
+        advance(lexer_info);
+        return lexer_error(lexer_info, SLS_STR("Unexpected closing bracket ']' without matching opening bracket."), start, start_line);
+    }
     // Type Tuples
     if (c == '(') return parse_type_tuples(lexer_info, c, start, start_line);
+    if (c == ')') {
+        advance(lexer_info);
+        return lexer_error(lexer_info, SLS_STR("Unexpected closing parentheses ')' without matching opening parentheses."), start, start_line);
+    }
     // Identifiers and Booleans
-    if (isascii(c)) return parse_identifiers_and_booleans(lexer_info, c, start, start_line);
-    // Lexing Error
-    return (LexerResult){SLS_ERROR, .error = (SlsError){"Lexer: Unknown Character Error.", 1}};
+    if (is_identifier_start(lexer_info))
+        return parse_identifiers_and_booleans(lexer_info, c, start, start_line);
+    if (c == ':') {
+        advance(lexer_info);
+        if (far_peek(lexer_info, 1) == ':')
+            return lexer_error(lexer_info, SLS_STR("Invalid identifier literal: empty identifier after '::'."), start, start_line);
+        else
+            return lexer_error(lexer_info, SLS_STR("Unexpected single colon ':'."), start, start_line);
+    }
+
+    // Random Characters
+    SlsStr error_msg = sls_format(SLS_STR("Unexpected character: unexpected '%c' during parsing."), c);
+    if (error_msg.str == NULL) return (LexerResult){SLS_ERROR, .error = (SlsError){SLS_STR("Out Of Memory Error."), 1}};
+    return lexer_error(lexer_info, error_msg, start, start_line);
+}
+
+void clean_token_string(TokenString token_string) {
+    if (token_string.tokens == NULL) return;
+    for (size_t i = 0; i < token_string.length; i++) {
+        if (token_string.tokens[i].type == TOKEN_STRING)
+            sls_str_free(&token_string.tokens[i].string_literal);
+        if (token_string.tokens[i].type == TOKEN_TOKEN_STRING)
+            clean_token_string(token_string.tokens[i].token_string);
+    }
+    free(token_string.tokens);
+    token_string.tokens = NULL;
 }
 
 void clean_token_result(LexerTokenResult *head) {
     // Deallocates a LexerTokenResult linked list
-    LexerTokenResult *next;
-    while (head) {
-        next = head->next;
-        if (head->type == SLS_ERROR) free(head->error.message);
-        if (head) free(head);
-        head = next;
+    if (head == NULL) return;
+    if (head->type == SLS_ERROR) sls_str_free(&head->error.message);
+    else {
+        if (head->result.type == TOKEN_STRING)
+            sls_str_free(&head->result.string_literal);
+        if (head->result.type == TOKEN_TOKEN_STRING)
+            clean_token_string(head->result.token_string);
     }
+    clean_token_result(head->next);
+    head->next = NULL;
+    if (head) free(head);
 }
 
 LexerTokenResult *get_token(LexerTokenResult *head, size_t i) {
@@ -600,7 +970,7 @@ LexerResult lexical_analysis(LexerInfo *lexer_info) {
         // Current should not be null_ptr
         if (current == 0) {
             clean_token_result(head);
-            return (LexerResult){SLS_ERROR, .error = (SlsError){"Unknown Error.", 1}};
+            return (LexerResult){SLS_ERROR, .error = (SlsError){SLS_STR("Unknown Error."), 1}};
         }
 
     } while (current->type != SLS_ERROR && current->result.type != TOKEN_EOF);

SLS_C/src/main.c

@@ -4,8 +4,37 @@
 // October 2025
 
 #include <stdio.h>
+#include <stddef.h>
+#include <string.h>
 
-int main(void) {
-    printf("Hello, world!\n");
+#include "sls/meta.h"
+#include "sls/bool.h"
+#include "sls/string.h"
+#include "sls/repl.h"
+#include "sls/file.h"
+
+int main(int argc, char *argv[]) {
+    Boolean version = FALSE;
+    char *filename = NULL;
+
+    if (argc == 2) {
+        if (strcmp(argv[1], "--version") == 0) version = TRUE;
+        else if (strcmp(argv[1], "-v") == 0) version = TRUE;
+        else filename = argv[1];
+    } else if (argc > 2) {
+        printf("To many arguments!");
+        return 1;
+    }
+
+    if (version) {
+        print_version();
         return 0;
+    } else if (filename != NULL) {
+        SlsStr sls_filename = sls_str_malloc(filename, strlen(filename));
+        int rv = file(sls_filename);
+        sls_str_free(&sls_filename);
+        return rv;
+    } else {
+        return repl();
+    }
 }

SLS_C/src/meta.c

@@ -0,0 +1,13 @@
+// Kyler Olsen
+// YREA SLS
+// MEta File
+// November 2025
+
+#include <stdio.h>
+
+#include "sls/meta.h"
+
+void print_version() {
+    printf("YREA SLS (" SLS_NAME ") " SLS_VER " (" GIT_COMMIT_HASH ")\n");
+    printf("Compiled with " COMPILER_NAME " %d at " __DATE__ " " __TIME__ "\n", COMPILER_VER);
+}

SLS_C/src/pico_main.c

@@ -0,0 +1,205 @@
+// Kyler Olsen
+// YREA SLS
+// Pico Main File
+// December 2025
+
+#include <stdio.h>
+#include <stddef.h>
+#include <string.h>
+
+#include "pico/stdlib.h"
+#include "pico/stdio_usb.h"
+#include "hardware/uart.h"
+#include "hardware/gpio.h"
+
+#include "sls/meta.h"
+#include "sls/bool.h"
+#include "sls/string.h"
+#include "sls/errors.h"
+#include "sls/lexer.h"
+#include "sls/interpreter.h"
+
+// Pico onboard LED
+#define LED_PIN 25
+
+static const SlsStr PICO_REPL_NAME = SLS_STR_CONST("<PICO-REPL>");
+
+void print_top_of_stack(InterpreterState *interpreter_state) {
+    if (interpreter_state->stack == NULL) {
+        printf("#0: <STACK IS EMPTY>\n");
+        return;
+    }
+    switch (interpreter_state->stack->type) {
+    case STACK_IDENTIFIER:
+        printf("#0: ::%s\n", interpreter_state->stack->identifier.name.str);
+        break;
+    case STACK_I64:
+        printf("#0: %ld:i64\n", interpreter_state->stack->i64);
+        break;
+    case STACK_I32:
+        printf("#0: %d\n", interpreter_state->stack->i32);
+        break;
+    case STACK_I16:
+        printf("#0: %d:i16\n", interpreter_state->stack->i16);
+        break;
+    case STACK_I8:
+        printf("#0: %d:i8\n", interpreter_state->stack->i8);
+        break;
+    case STACK_U64:
+        printf("#0: %lu:u64\n", interpreter_state->stack->u64);
+        break;
+    case STACK_U32:
+        printf("#0: %u:u32\n", interpreter_state->stack->u32);
+        break;
+    case STACK_U16:
+        printf("#0: %u:u16\n", interpreter_state->stack->u16);
+        break;
+    case STACK_U8:
+        printf("#0: %u:u8\n", interpreter_state->stack->u8);
+        break;
+    case STACK_FLOAT:
+        printf("#0: %f:f32\n", interpreter_state->stack->f32);
+        break;
+    case STACK_DOUBLE:
+        printf("#0: %f\n", interpreter_state->stack->f64);
+        break;
+    case STACK_CHARACTER:
+        printf("#0: %c\n", interpreter_state->stack->character);
+        break;
+    case STACK_BOOLEAN:
+        if (interpreter_state->stack->boolean) printf("#0: TRUE\n");
+        else printf("#0: FALSE\n");
+        break;
+    case STACK_TOKEN_STRING:
+        printf("#0: <TOKEN STRING>\n");
+        break;
+    case STACK_CALLABLE:
+        printf("#0: <CALLABLE>\n");
+        break;
+    }
+}
+
+void led_blink(int count) {
+    for (int i = 0; i < count; i++) {
+        gpio_put(LED_PIN, 1);
+        sleep_ms(100);
+        gpio_put(LED_PIN, 0);
+        sleep_ms(100);
+    }
+}
+
+int pico_repl() {
+    // Initialize LED
+    gpio_init(LED_PIN);
+    gpio_set_dir(LED_PIN, GPIO_OUT);
+
+    // Blink to show we're ready
+    led_blink(3);
+
+    // Wait for a key press to start the repl
+    while (true) {
+        int c = getchar_timeout_us(100000);
+        if (c == PICO_ERROR_TIMEOUT) {
+            continue;
+        } else if (c == '\r' || c == '\n' || c == 8 || (c >= 32 && c < 128)) {
+            printf("\n");
+            break;
+        }
+    }
+
+    led_blink(1);
+
+    print_version();
+    printf("===== YREA SLS PICO REPL =====\n");
+    printf("Type `#exit` to exit.\n");
+    fflush(stdout);
+
+    LexerInfo lexer_info;
+    InterpreterState *interpreter_state = interpreter_create();
+    if (interpreter_state == NULL) {
+        printf("ERROR: Failed to create interpreter!\n");
+        return 1;
+    }
+
+    char buf[256];
+    int buf_pos = 0;
+
+    while (true) {
+        // Read character by character for better embedded behavior
+        int c = getchar_timeout_us(100000); // 100ms timeout
+
+        if (c == PICO_ERROR_TIMEOUT) {
+            continue;
+        }
+
+        if (c == '\r' || c == '\n') {
+            if (buf_pos == 0) continue; // Empty line
+
+            buf[buf_pos] = '\0';
+            printf("\n"); // Echo newline
+
+            if (strncmp(buf, "#exit", 5) == 0) {
+                printf("Exiting REPL...\n");
+                interpreter_delete(interpreter_state);
+                led_blink(2);
+                return 0;
+            }
+
+            SlsStr code = sls_str_malloc(buf, buf_pos);
+            init_lexer(&lexer_info, PICO_REPL_NAME, code);
+            LexerResult result = lexical_analysis(&lexer_info);
+
+            if (result.type == SLS_ERROR) {
+                printf("%s\n", result.error.message.str);
+                sls_str_free(&result.error.message);
+            } else {
+                LexerTokenResult *head = result.result;
+                while (head) {
+                    if (head->type == SLS_ERROR) {
+                        printf("%s\n", head->error.message.str);
+                        break;
+                    } else if (!execute(interpreter_state, head)) {
+                        printf("A runtime error occurred!\n");
+                        break;
+                    }
+                    head = head->next;
+                }
+                clean_token_result(result.result);
+                print_top_of_stack(interpreter_state);
+            }
+            sls_str_free(&code);
+
+            buf_pos = 0;
+
+        } else if (c == 127 || c == 8) {
+            // Backspace or DEL
+            if (buf_pos > 0) {
+                buf_pos--;
+                printf("\b \b"); // Erase character from terminal
+                fflush(stdout);
+            }
+        } else if (c >= 32 && c < 127 && buf_pos < 255) {
+            // Printable character
+            buf[buf_pos++] = (char)c;
+            putchar(c); // Echo character
+            fflush(stdout);
+        }
+    }
+
+    interpreter_delete(interpreter_state);
+    return 1;
+}
+
+int main() {
+    // Initialize USB/UART stdio
+    stdio_init_all();
+    // Wait a bit for USB to enumerate
+    sleep_ms(5000);
+
+    printf("\n\n=============================\n");
+    printf("YREA SLS on Raspberry Pi Pico\n");
+    printf("=============================\n\n");
+    printf("Press any key to begin...\n");
+
+    return pico_repl();
+}

SLS_C/src/repl.c

@@ -0,0 +1,118 @@
+// Kyler Olsen
+// YREA SLS
+// REPL
+// November 2025
+
+#include <stddef.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "sls/repl.h"
+#include "sls/meta.h"
+#include "sls/errors.h"
+#include "sls/lexer.h"
+#include "sls/string.h"
+#include "sls/interpreter.h"
+
+static const SlsStr REPL_FILE_NAME = SLS_STR_CONST("<STDIN>");
+
+void print_top_of_stack(InterpreterState *interpreter_state) {
+    if (interpreter_state->stack == NULL) {
+        printf("#0: <STACK IS EMPTY>\n");
+        return;
+    }
+    switch (interpreter_state->stack->type) {
+    case STACK_IDENTIFIER:
+        printf("#0: ::%s\n", interpreter_state->stack->identifier.name.str);
+        break;
+    case STACK_I64:
+        printf("#0: %ld\n", interpreter_state->stack->i64);
+        break;
+    case STACK_I32:
+        printf("#0: %d:i32\n", interpreter_state->stack->i32);
+        break;
+    case STACK_I16:
+        printf("#0: %d:i16\n", interpreter_state->stack->i16);
+        break;
+    case STACK_I8:
+        printf("#0: %d:8\n", interpreter_state->stack->i8);
+        break;
+    case STACK_U64:
+        printf("#0: %lu:u64\n", interpreter_state->stack->u64);
+        break;
+    case STACK_U32:
+        printf("#0: %u:32\n", interpreter_state->stack->u32);
+        break;
+    case STACK_U16:
+        printf("#0: %u:16\n", interpreter_state->stack->u16);
+        break;
+    case STACK_U8:
+        printf("#0: %u:8\n", interpreter_state->stack->u8);
+        break;
+    case STACK_FLOAT:
+        printf("#0: %f:f32\n", interpreter_state->stack->f32);
+        break;
+    case STACK_DOUBLE:
+        printf("#0: %f\n", interpreter_state->stack->f64);
+        break;
+    case STACK_CHARACTER:
+        printf("#0: %c\n", interpreter_state->stack->character);
+        break;
+    case STACK_BOOLEAN:
+        if (interpreter_state->stack->boolean) printf("#0: TRUE\n");
+        else printf("#0: FALSE\n");
+        break;
+    case STACK_TOKEN_STRING:
+        printf("#0: <TOKEN STRING>\n");
+        break;
+    case STACK_CALLABLE:
+        printf("#0: <CALLABLE>\n");
+        break;
+    }
+}
+
+int repl() {
+    print_version();
+    printf("===== YREA SLS REPL =====\n");
+    printf("Type `#exit` to exit.\n");
+    fflush(stdout);
+
+    LexerInfo lexer_info;
+    InterpreterState *interpreter_state = interpreter_create();
+    if (interpreter_state == NULL) return 1;
+    char buf[256];
+    while (fgets(buf, sizeof(buf), stdin)) {
+        size_t len = strlen(buf);
+        if (len && buf[len - 1] == '\n') buf[len - 1] = '\0';
+        if (strncmp(buf, "#exit", 5) == 0) {
+            interpreter_delete(interpreter_state);
+            return 0;
+        }
+
+        SlsStr code = sls_str_malloc(buf, sizeof(buf));
+        init_lexer(&lexer_info, REPL_FILE_NAME, code);
+        LexerResult result = lexical_analysis(&lexer_info);
+        if (result.type == SLS_ERROR) {
+            printf("%s\n", result.error.message.str);
+            sls_str_free(&result.error.message);
+        } else {
+            LexerTokenResult *head = result.result;
+            while (head) {
+                if (head->type == SLS_ERROR) {
+                    printf("%s\n", head->error.message.str);
+                    break;
+                } else if (!execute(interpreter_state, head)) {
+                    printf("A runtime error occurred!\n");
+                    break;
+                }
+                head = head->next;
+            }
+            clean_token_result(result.result);
+            print_top_of_stack(interpreter_state);
+        }
+        sls_str_free(&code);
+    }
+
+    interpreter_delete(interpreter_state);
+    return 1;
+}

SLS_C/src/string.c

@@ -4,14 +4,328 @@
 // November 2025
 
 #include <stddef.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdarg.h>
+#include <math.h>
+#include <stdlib.h>
 
-int isascii(unsigned char c) {
+#include "sls/string.h"
+#include "sls/lexer.h"
+
+int sls_isascii(unsigned char c) {
     return c < 128;
 }
 
-size_t strnlen(const char *s, size_t maxlen) {
+size_t sls_str_nlen(const char *s, size_t maxlen) {
     size_t i;
     for (i = 0; i < maxlen; i++)
         if (s[i] == '\0') break;
     return i;
 }
+
+SlsStr sls_str_malloc(const char *s, size_t maxlen) {
+    size_t length = sls_str_nlen(s, maxlen);
+    char *new_str = (char *)malloc(sizeof(char) * (length + 1));
+    if (new_str == NULL) return SLS_STR_NULL;
+    memcpy(new_str, s, length);
+    new_str[length] = '\0';
+    return (SlsStr){length, new_str, TRUE};
+}
+
+SlsStr sls_str_new(size_t length) {
+    char *new_str = (char *)calloc(length + 1, sizeof(char));
+    if (new_str == NULL) return SLS_STR_NULL;
+    return (SlsStr){length, new_str, TRUE};
+}
+
+SlsStr sls_str_cpy(const SlsStr s) {
+    return sls_str_malloc(s.str, s.len);
+}
+
+int32_t sls_str_cmp(const SlsStr a, const SlsStr b) {
+    int cmp = strncmp(a.str, b.str, (a.len < b.len) ? a.len : b.len);
+    if (cmp != 0) return cmp;
+    return (a.len > b.len) - (a.len < b.len);
+}
+
+void sls_str_free(SlsStr *s) {
+    if (s->allocated) {
+        free((void *)s->str);
+        s->len = 0;
+        s->str = NULL;
+        s->allocated = FALSE;
+    }
+}
+
+typedef enum {
+    FORMAT_PERCENT_ESCAPE,
+    FORMAT_C_STRINGS,
+    FORMAT_CHARACTER,
+    FORMAT_INTEGER_32,
+    FORMAT_INTEGER_64,
+    FORMAT_UNSIGNED_INTEGER_64,
+    FORMAT_SIZE_INTEGER,
+    FORMAT_FLOAT,
+    FORMAT_SLS_STR,
+    FORMAT_SLS_TOKEN_TYPE,
+    FORMAT_SLS_ARRAY_TYPE,
+    FORMAT_SLS_BUILTIN_INTEGER,
+    FORMAT_SLS_ERROR,
+    FORMAT_SLS_BOOLEAN,
+} FormatStringTypes;
+
+typedef struct {
+    FormatStringTypes type;
+    union {
+        const char *c_string;
+        char character;
+        int32_t integer_32;
+        int64_t integer_64;
+        uint64_t unsigned_integer_64;
+        size_t size_integer;
+        double ffloat;
+        SlsStr sls_str;
+        TokenType token_type;
+        ArrayType array_type;
+        IntegerBuiltInType builtin_integer;
+        SlsError error;
+        Boolean boolean;
+    };
+    ptrdiff_t str_index;
+    size_t self_length;
+} FormatStringItem;
+
+static size_t number_length(int64_t i) {
+    if (i == 0) return 1;
+    size_t len = (i < 0 ? 1 : 0);
+    while (i) { len++; i /= 10; }
+    return len;
+}
+
+static size_t unsigned_number_length(uint64_t i) {
+    if (i == 0) return 1;
+    size_t len = 0;
+    while (i) { len++; i /= 10; }
+    return len;
+}
+
+SlsStr sls_format(const SlsStr s, ...) {
+    va_list args;
+    va_start(args, s);
+    size_t count = 0;
+    const char *current = strchr(s.str, '%');
+    do {
+        if (!current) break;
+        if (!current[1]) break;
+        switch (current[1]) {
+        case '%':
+        case 'y':
+        case 'c':
+        case 'd':
+        case 'l':
+        case 'u':
+        case 'z':
+        case 'f':
+        case 's':
+        case 't':
+        case 'a':
+        case 'i':
+        case 'e':
+        case 'b':
+            count++;
+            break;
+        }
+        current = strchr(current + 2, '%');
+    } while (current);
+
+    FormatStringItem *items = (FormatStringItem *)malloc(sizeof(FormatStringItem) * count);
+    if (items == NULL) return SLS_STR_NULL;
+    size_t i = 0;
+    const char *last_index = s.str;
+    size_t length = s.len;
+    current = strchr(s.str, '%');
+    do {
+        switch (current[1]) {
+        case '%':
+            items[i].type = FORMAT_PERCENT_ESCAPE;
+            length += items[i].self_length = 1;
+            length -= 2;
+            break;
+        case 'y':
+            items[i].type = FORMAT_C_STRINGS;
+            items[i].c_string = va_arg(args, const char *);
+            length += items[i].self_length = strlen(items[i].c_string);
+            length -= 2;
+            break;
+        case 'c':
+            items[i].type = FORMAT_CHARACTER;
+            items[i].character = va_arg(args, int);
+            length += items[i].self_length = 1;
+            length -= 2;
+            break;
+        case 'd':
+            items[i].type = FORMAT_INTEGER_32;
+            items[i].integer_32 = va_arg(args, int32_t);
+            length += items[i].self_length = number_length(items[i].integer_32);
+            length -= 2;
+            break;
+        case 'l':
+            items[i].type = FORMAT_INTEGER_64;
+            items[i].integer_64 = va_arg(args, int64_t);
+            length += items[i].self_length = number_length(items[i].integer_64);
+            length -= 2;
+            break;
+        case 'u':
+            items[i].type = FORMAT_UNSIGNED_INTEGER_64;
+            items[i].unsigned_integer_64 = va_arg(args, uint64_t);
+            length += items[i].self_length = unsigned_number_length(items[i].unsigned_integer_64);
+            length -= 2;
+            break;
+        case 'z':
+            items[i].type = FORMAT_SIZE_INTEGER;
+            items[i].size_integer = va_arg(args, size_t);
+            length += items[i].self_length = unsigned_number_length(items[i].size_integer);
+            length -= 2;
+            break;
+        case 'f':
+            items[i].type = FORMAT_FLOAT;
+            items[i].ffloat = va_arg(args, double);
+            length += items[i].self_length = snprintf(NULL, 0, "%.2f", items[i].ffloat);
+            length -= 2;
+            break;
+        case 's':
+            items[i].type = FORMAT_SLS_STR;
+            items[i].sls_str = va_arg(args, SlsStr);
+            length += items[i].self_length = items[i].sls_str.len;
+            length -= 2;
+            break;
+        case 't':
+            items[i].type = FORMAT_SLS_TOKEN_TYPE;
+            items[i].token_type = va_arg(args, TokenType);
+            if (items[i].token_type >= TOKEN_TYPE_COUNT) {
+                free(items);
+                return SLS_STR_NULL;
+            }
+            length += items[i].self_length = sls_str_nlen(TOKEN_TYPES_NAMES[items[i].token_type], TYPE_NAMES_SAFE_LENGTH);
+            length -= 2;
+            break;
+        case 'a':
+            items[i].type = FORMAT_SLS_ARRAY_TYPE;
+            items[i].array_type = va_arg(args, ArrayType);
+            if (items[i].array_type >= ARRAY_TYPE_COUNT) {
+                free(items);
+                return SLS_STR_NULL;
+            }
+            length += items[i].self_length = sls_str_nlen(ARRAY_TYPES_NAMES[items[i].array_type], TYPE_NAMES_SAFE_LENGTH);
+            length -= 2;
+            break;
+        case 'i':
+            items[i].type = FORMAT_SLS_BUILTIN_INTEGER;
+            items[i].builtin_integer = va_arg(args, IntegerBuiltInType);
+            if (items[i].builtin_integer >= INTEGER_TYPE_COUNT) {
+                free(items);
+                return SLS_STR_NULL;
+            }
+            length += items[i].self_length = sls_str_nlen(INTEGER_TYPES_NAMES[items[i].builtin_integer], TYPE_NAMES_SAFE_LENGTH);
+            length -= 2;
+            break;
+        case 'e':
+            items[i].type = FORMAT_SLS_ERROR;
+            items[i].error = va_arg(args, SlsError);
+            length += items[i].self_length = items[i].error.message.len;
+            length -= 2;
+            break;
+        case 'b':
+            items[i].type = FORMAT_SLS_BOOLEAN;
+            items[i].boolean = va_arg(args, Boolean);
+            length += items[i].self_length = (items[i].boolean ? 4 : 5);
+            length -= 2;
+            break;
+        }
+        items[i].str_index = (ptrdiff_t)(current - last_index);
+        last_index = current + 2;
+        i++;
+        current = strchr(current + 2, '%');
+    } while (current);
+    va_end(args);
+
+    char *temp = (char *)malloc(sizeof(char) * length);
+    if (temp == NULL) {
+        free(items);
+        return SLS_STR_NULL;
+    }
+    SlsStr str_new = sls_str_new(length);
+    if (str_new.str == NULL) {
+        free(items);
+        free(temp);
+        return SLS_STR_NULL;
+    }
+    char *str = (char *)str_new.str;
+    size_t item_i = 0;
+    ptrdiff_t target_i = 0;
+    ptrdiff_t source_i = 0;
+
+    while (item_i < count) {
+        memcpy(str + target_i, s.str + source_i, items[item_i].str_index);
+        target_i += items[item_i].str_index;
+        source_i += items[item_i].str_index + 2;
+
+        switch (items[item_i].type) {
+        case FORMAT_PERCENT_ESCAPE:
+            memcpy(temp, "%", items[item_i].self_length + 1);
+            break;
+        case FORMAT_C_STRINGS:
+            snprintf(temp, items[item_i].self_length + 1, "%s", items[item_i].c_string);
+            break;
+        case FORMAT_CHARACTER:
+            snprintf(temp, items[item_i].self_length + 1, "%c", items[item_i].character);
+            break;
+        case FORMAT_INTEGER_32:
+            snprintf(temp, items[item_i].self_length + 1, "%d", items[item_i].integer_32);
+            break;
+        case FORMAT_INTEGER_64:
+            snprintf(temp, items[item_i].self_length + 1, "%ld", items[item_i].integer_64);
+            break;
+        case FORMAT_UNSIGNED_INTEGER_64:
+            snprintf(temp, items[item_i].self_length + 1, "%lu", items[item_i].unsigned_integer_64);
+            break;
+        case FORMAT_SIZE_INTEGER:
+            snprintf(temp, items[item_i].self_length + 1, "%zu", items[item_i].size_integer);
+            break;
+        case FORMAT_FLOAT:
+            snprintf(temp, items[item_i].self_length + 1, "%.2f", items[item_i].ffloat); // Fixed-point decimal display
+            break;
+        case FORMAT_SLS_STR:
+            snprintf(temp, items[item_i].self_length + 1, "%s", items[item_i].sls_str.str);
+            break;
+        case FORMAT_SLS_TOKEN_TYPE:
+            snprintf(temp, items[item_i].self_length + 1, "%s", TOKEN_TYPES_NAMES[items[item_i].token_type]);
+            break;
+        case FORMAT_SLS_ARRAY_TYPE:
+            snprintf(temp, items[item_i].self_length + 1, "%s", ARRAY_TYPES_NAMES[items[item_i].array_type]);
+            break;
+        case FORMAT_SLS_BUILTIN_INTEGER:
+            snprintf(temp, items[item_i].self_length + 1, "%s", INTEGER_TYPES_NAMES[items[item_i].builtin_integer]);
+            break;
+        case FORMAT_SLS_ERROR:
+            snprintf(temp, items[item_i].self_length + 1, "%s", items[item_i].error.message.str);
+            break;
+        case FORMAT_SLS_BOOLEAN:
+            memcpy(temp, (items[item_i].boolean ? "TRUE" : "FALSE"), items[item_i].self_length + 1);
+            break;
+        }
+
+        memcpy(str + target_i, temp, items[item_i].self_length);
+        target_i += items[item_i].self_length;
+        item_i++;
+    }
+    if (s.len > (size_t)source_i)
+        memcpy(str + target_i, s.str + source_i, s.len - source_i);
+    str[str_new.len] = '\0';
+
+    free(items);
+    free(temp);
+    return str_new;
+}

SLS_C/tests/extra_tests.c

@@ -0,0 +1,52 @@
+// Kyler Olsen
+// YREA SLS
+// Extra Tests
+// November 2025
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdint.h>
+
+#include "sls/string.h"
+#include "sls/lexer.h"
+#include "sls/errors.h"
+#include "tests/lexer_test_helpers.h"
+#include "tests/tests.h"
+
+static const size_t NUM_EXTRA_TESTS = 2;
+
+static TestResult test_Identifier_Addition() {
+    LexerTest test = start_up_test(SLS_STR("Identifier Addition"), SLS_STR("+"));
+    LexerResult result = lexical_analysis(&test.lexer_info);
+    if (result.type == SLS_ERROR) return error_fail_test(&test, result, result.error);
+    size_t i = 0;
+    if (test_identifier_value(&test, result, i++, &(TestIdentifierValue){FALSE, SLS_STR("+")})) return test.result;
+    if (test_eof_value(&test, result, i++, 0)) return test.result;
+    return pass_test(&test, result);
+}
+
+static TestResult test_Identifier_Division() {
+    LexerTest test = start_up_test(SLS_STR("Identifier Division"), SLS_STR("/"));
+    LexerResult result = lexical_analysis(&test.lexer_info);
+    if (result.type == SLS_ERROR) return error_fail_test(&test, result, result.error);
+    size_t i = 0;
+    if (test_identifier_value(&test, result, i++, &(TestIdentifierValue){FALSE, SLS_STR("/")})) return test.result;
+    if (test_eof_value(&test, result, i++, 0)) return test.result;
+    return pass_test(&test, result);
+}
+
+// Run all extra tests
+TestsReport run_extra_tests()
+{
+    TestsReport report = {
+        .section = SLS_STR("extra_tests"),
+        .count = NUM_EXTRA_TESTS,
+        .tests = malloc(sizeof(TestResult) * NUM_EXTRA_TESTS)};
+
+    size_t i = 0;
+    (void)i;
+    report.tests[i++] = test_Identifier_Addition();
+    report.tests[i++] = test_Identifier_Division();
+    return report;
+}

SLS_C/tests/hash_table_tests.c

@@ -0,0 +1,383 @@
+// Kyler Olsen
+// YREA SLS
+// Hash Table Tests
+// November 2025
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdint.h>
+
+#include "sls/string.h"
+#include "sls/hash_table.h"
+#include "tests/tests.h"
+
+static const size_t NUM_HASH_TABLE_TESTS = 12;
+
+static TestResult pass_hash_table_test(SlsStr test_name) {
+    TestResult result = {.name = test_name, .status = TEST_NOT_IMPLEMENTED};
+    result.status = TEST_PASS;
+    return result;
+}
+
+static TestResult fail_hash_table_test(SlsStr test_name, SlsStr message) {
+    TestResult result = { .name = test_name, .status = TEST_NOT_IMPLEMENTED };
+    result.status = TEST_ERROR;
+    result.message = sls_str_cpy(message);
+
+    if (result.message.str == NULL) {
+        result.error = (SlsError){ SLS_STR("Out Of Memory Error."), 1 };
+        result.status = TEST_ERROR;
+    }
+    return result;
+}
+
+// Test init_hash_table and del_hash_table
+static TestResult test_init_and_delete() {
+    HashTable *ht = init_hash_table(10);
+    if (!ht) return fail_hash_table_test(SLS_STR("test_init_and_delete"), SLS_STR("Initialization failed"));
+    
+    if (ht->buckets_count < 10) {
+        del_hash_table(ht);
+        return fail_hash_table_test(SLS_STR("test_init_and_delete"), SLS_STR("Bucket count less than minimum"));
+    }
+
+    del_hash_table(ht);
+    return pass_hash_table_test(SLS_STR("test_init_and_delete"));
+}
+
+// Test basic put and get operations
+static TestResult test_put_and_get() {
+    HashTable *ht = init_hash_table(10);
+    if (!ht) return fail_hash_table_test(SLS_STR("test_put_and_get"), SLS_STR("Initialization failed"));
+
+    int value1 = 42;
+    int value2 = 84;
+    SlsStr key1 = SLS_STR("key1");
+    SlsStr key2 = SLS_STR("key2");
+
+    if (!hash_table_put(ht, key1, &value1)) {
+        del_hash_table(ht);
+        return fail_hash_table_test(SLS_STR("test_put_and_get"), SLS_STR("Put operation failed"));
+    }
+
+    if (!hash_table_put(ht, key2, &value2)) {
+        del_hash_table(ht);
+        return fail_hash_table_test(SLS_STR("test_put_and_get"), SLS_STR("Second put operation failed"));
+    }
+
+    int *retrieved1 = (int*)hash_table_get(ht, key1, NULL);
+    int *retrieved2 = (int*)hash_table_get(ht, key2, NULL);
+
+    if (!retrieved1 || *retrieved1 != 42) {
+        del_hash_table(ht);
+        return fail_hash_table_test(SLS_STR("test_put_and_get"), SLS_STR("Get operation failed for key1"));
+    }
+
+    if (!retrieved2 || *retrieved2 != 84) {
+        del_hash_table(ht);
+        return fail_hash_table_test(SLS_STR("test_put_and_get"), SLS_STR("Get operation failed for key2"));
+    }
+
+    del_hash_table(ht);
+    return pass_hash_table_test(SLS_STR("test_put_and_get"));
+}
+
+// Test get with non-existent key returns default
+static TestResult test_get_nonexistent_key() {
+    HashTable *ht = init_hash_table(10);
+    if (!ht) return fail_hash_table_test(SLS_STR("test_get_nonexistent_key"), SLS_STR("Initialization failed"));
+
+    int default_value = -1;
+    SlsStr key = SLS_STR("nonexistent");
+
+    int *result = (int*)hash_table_get(ht, key, &default_value);
+    if (result != &default_value) {
+        del_hash_table(ht);
+        return fail_hash_table_test(SLS_STR("test_get_nonexistent_key"), SLS_STR("Did not return default value"));
+    }
+
+    del_hash_table(ht);
+    return pass_hash_table_test(SLS_STR("test_get_nonexistent_key"));
+}
+
+// Test updating existing key
+static TestResult test_update_existing_key() {
+    HashTable *ht = init_hash_table(10);
+    if (!ht) return fail_hash_table_test(SLS_STR("test_update_existing_key"), SLS_STR("Initialization failed"));
+
+    int value1 = 100;
+    int value2 = 200;
+    SlsStr key = SLS_STR("update_key");
+
+    hash_table_put(ht, key, &value1);
+    hash_table_put(ht, key, &value2);
+
+    int *result = (int*)hash_table_get(ht, key, NULL);
+    if (!result || *result != 200) {
+        del_hash_table(ht);
+        return fail_hash_table_test(SLS_STR("test_update_existing_key"), SLS_STR("Update failed"));
+    }
+
+    del_hash_table(ht);
+    return pass_hash_table_test(SLS_STR("test_update_existing_key"));
+}
+
+// Test delete operation
+static TestResult test_delete_key() {
+    HashTable *ht = init_hash_table(10);
+    if (!ht) return fail_hash_table_test(SLS_STR("test_delete_key"), SLS_STR("Initialization failed"));
+
+    int value = 42;
+    SlsStr key = SLS_STR("delete_key");
+
+    hash_table_put(ht, key, &value);
+
+    if (!hash_table_del(ht, key)) {
+        del_hash_table(ht);
+        return fail_hash_table_test(SLS_STR("test_delete_key"), SLS_STR("Delete returned FALSE"));
+    }
+
+    int default_val = -1;
+    int *result = (int*)hash_table_get(ht, key, &default_val);
+    if (result != &default_val) {
+        del_hash_table(ht);
+        return fail_hash_table_test(SLS_STR("test_delete_key"), SLS_STR("Key still exists after delete"));
+    }
+
+    del_hash_table(ht);
+    return pass_hash_table_test(SLS_STR("test_delete_key"));
+}
+
+// Test delete non-existent key returns FALSE
+static TestResult test_delete_nonexistent_key() {
+    HashTable *ht = init_hash_table(10);
+    if (!ht) return fail_hash_table_test(SLS_STR("test_delete_nonexistent_key"), SLS_STR("Initialization failed"));
+
+    SlsStr key = SLS_STR("nonexistent");
+
+    if (hash_table_del(ht, key)) {
+        del_hash_table(ht);
+        return fail_hash_table_test(SLS_STR("test_delete_nonexistent_key"), SLS_STR("Delete returned TRUE for nonexistent key"));
+    }
+
+    del_hash_table(ht);
+    return pass_hash_table_test(SLS_STR("test_delete_nonexistent_key"));
+}
+
+// Test collision handling (multiple keys in same bucket)
+static TestResult test_collision_handling() {
+    HashTable *ht = init_hash_table(1); // Force collisions with single bucket
+    if (!ht) return fail_hash_table_test(SLS_STR("test_collision_handling"), SLS_STR("Initialization failed"));
+
+    int val1 = 1, val2 = 2, val3 = 3;
+    SlsStr key1 = SLS_STR("key1");
+    SlsStr key2 = SLS_STR("key2");
+    SlsStr key3 = SLS_STR("key3");
+
+    hash_table_put(ht, key1, &val1);
+    hash_table_put(ht, key2, &val2);
+    hash_table_put(ht, key3, &val3);
+
+    int *r1 = (int*)hash_table_get(ht, key1, NULL);
+    int *r2 = (int*)hash_table_get(ht, key2, NULL);
+    int *r3 = (int*)hash_table_get(ht, key3, NULL);
+
+    if (!r1 || *r1 != 1 || !r2 || *r2 != 2 || !r3 || *r3 != 3) {
+        del_hash_table(ht);
+        return fail_hash_table_test(SLS_STR("test_collision_handling"), SLS_STR("Collision handling failed"));
+    }
+
+    del_hash_table(ht);
+    return pass_hash_table_test(SLS_STR("test_collision_handling"));
+}
+
+// Test empty string key
+static TestResult test_empty_key() {
+    HashTable *ht = init_hash_table(10);
+    if (!ht) return fail_hash_table_test(SLS_STR("test_empty_key"), SLS_STR("Initialization failed"));
+
+    int value = 99;
+    SlsStr key = SLS_STR("");
+
+    if (!hash_table_put(ht, key, &value)) {
+        del_hash_table(ht);
+        return fail_hash_table_test(SLS_STR("test_empty_key"), SLS_STR("Put with empty key failed"));
+    }
+
+    int *result = (int*)hash_table_get(ht, key, NULL);
+    if (!result || *result != 99) {
+        del_hash_table(ht);
+        return fail_hash_table_test(SLS_STR("test_empty_key"), SLS_STR("Get with empty key failed"));
+    }
+
+    del_hash_table(ht);
+    return pass_hash_table_test(SLS_STR("test_empty_key"));
+}
+
+// Test long key
+static TestResult test_long_key() {
+    HashTable *ht = init_hash_table(10);
+    if (!ht) return fail_hash_table_test(SLS_STR("test_long_key"), SLS_STR("Initialization failed"));
+
+    char long_key_str[256];
+    for (size_t i = 0; i < 255; i++) long_key_str[i] = 'A';
+    long_key_str[255] = '\0';
+
+    SlsStr key = sls_str_malloc(long_key_str, 255);
+    int value = 777;
+
+    if (!hash_table_put(ht, key, &value)) {
+        sls_str_free(&key);
+        del_hash_table(ht);
+        return fail_hash_table_test(SLS_STR("test_long_key"), SLS_STR("Put with long key failed"));
+    }
+
+    int *result = (int*)hash_table_get(ht, key, NULL);
+    if (!result || *result != 777) {
+        sls_str_free(&key);
+        del_hash_table(ht);
+        return fail_hash_table_test(SLS_STR("test_long_key"), SLS_STR("Get with long key failed"));
+    }
+
+    sls_str_free(&key);
+    del_hash_table(ht);
+    return pass_hash_table_test(SLS_STR("test_long_key"));
+}
+
+// Test multiple operations sequence
+static TestResult test_multiple_operations() {
+    HashTable *ht = init_hash_table(10);
+    if (!ht) return fail_hash_table_test(SLS_STR("test_multiple_operations"), SLS_STR("Initialization failed"));
+
+    int vals[5] = {10, 20, 30, 40, 50};
+    SlsStr keys[5] = {SLS_STR("k1"), SLS_STR("k2"), SLS_STR("k3"), SLS_STR("k4"), SLS_STR("k5")};
+
+    // Insert all
+    for (int i = 0; i < 5; i++) {
+        if (!hash_table_put(ht, keys[i], &vals[i])) {
+            del_hash_table(ht);
+            return fail_hash_table_test(SLS_STR("test_multiple_operations"), SLS_STR("Insert failed"));
+        }
+    }
+
+    // Delete some
+    hash_table_del(ht, keys[1]);
+    hash_table_del(ht, keys[3]);
+
+    // Verify remaining
+    int *r0 = (int*)hash_table_get(ht, keys[0], NULL);
+    int *r2 = (int*)hash_table_get(ht, keys[2], NULL);
+    int *r4 = (int*)hash_table_get(ht, keys[4], NULL);
+
+    if (!r0 || *r0 != 10 || !r2 || *r2 != 30 || !r4 || *r4 != 50) {
+        del_hash_table(ht);
+        return fail_hash_table_test(SLS_STR("test_multiple_operations"), SLS_STR("Get after delete failed"));
+    }
+
+    // Verify deleted
+    int def = -1;
+    int *r1 = (int*)hash_table_get(ht, keys[1], &def);
+    int *r3 = (int*)hash_table_get(ht, keys[3], &def);
+
+    if (r1 != &def || r3 != &def) {
+        del_hash_table(ht);
+        return fail_hash_table_test(SLS_STR("test_multiple_operations"), SLS_STR("Deleted keys still present"));
+    }
+
+    del_hash_table(ht);
+    return pass_hash_table_test(SLS_STR("test_multiple_operations"));
+}
+
+// Test storing NULL pointers
+static TestResult test_null_value() {
+    HashTable *ht = init_hash_table(10);
+    if (!ht) return fail_hash_table_test(SLS_STR("test_null_value"), SLS_STR("Initialization failed"));
+
+    SlsStr key = SLS_STR("null_key");
+    
+    if (!hash_table_put(ht, key, NULL)) {
+        del_hash_table(ht);
+        return fail_hash_table_test(SLS_STR("test_null_value"), SLS_STR("Put with NULL value failed"));
+    }
+
+    int default_val = -1;
+    void *result = hash_table_get(ht, key, &default_val);
+    
+    // Should retrieve NULL, not default
+    if (result == &default_val) {
+        del_hash_table(ht);
+        return fail_hash_table_test(SLS_STR("test_null_value"), SLS_STR("NULL value not stored correctly"));
+    }
+
+    del_hash_table(ht);
+    return pass_hash_table_test(SLS_STR("test_null_value"));
+}
+
+// Test large number of entries
+static TestResult test_large_capacity() {
+    HashTable *ht = init_hash_table(10);
+    if (!ht) return fail_hash_table_test(SLS_STR("test_large_capacity"), SLS_STR("Initialization failed"));
+
+    const size_t COUNT = 100;
+    int *values = malloc(sizeof(int) * COUNT);
+    SlsStr *keys = malloc(sizeof(SlsStr) * COUNT);
+
+    for (size_t i = 0; i < COUNT; i++) {
+        values[i] = (int)i;
+        char key_buf[32];
+        snprintf(key_buf, 32, "key_%zu", i);
+        keys[i] = sls_str_malloc(key_buf, strlen(key_buf));
+        
+        if (!hash_table_put(ht, keys[i], &values[i])) {
+            for (size_t j = 0; j <= i; j++) sls_str_free(&keys[j]);
+            free(keys);
+            free(values);
+            del_hash_table(ht);
+            return fail_hash_table_test(SLS_STR("test_large_capacity"), SLS_STR("Put failed in bulk insert"));
+        }
+    }
+
+    // Verify all entries
+    for (size_t i = 0; i < COUNT; i++) {
+        int *result = (int*)hash_table_get(ht, keys[i], NULL);
+        if (!result || *result != (int)i) {
+            for (size_t j = 0; j < COUNT; j++) sls_str_free(&keys[j]);
+            free(keys);
+            free(values);
+            del_hash_table(ht);
+            return fail_hash_table_test(SLS_STR("test_large_capacity"), SLS_STR("Get failed in bulk verify"));
+        }
+    }
+
+    for (size_t i = 0; i < COUNT; i++) sls_str_free(&keys[i]);
+    free(keys);
+    free(values);
+    del_hash_table(ht);
+    return pass_hash_table_test(SLS_STR("test_large_capacity"));
+}
+
+// Run all hash table tests
+TestsReport run_hash_table_tests() {
+    TestsReport report = {
+        .section = SLS_STR("hash_table_tests"),
+        .count = NUM_HASH_TABLE_TESTS,
+        .tests = malloc(sizeof(TestResult) * NUM_HASH_TABLE_TESTS)
+    };
+
+    size_t i = 0;
+    report.tests[i++] = test_init_and_delete();
+    report.tests[i++] = test_put_and_get();
+    report.tests[i++] = test_get_nonexistent_key();
+    report.tests[i++] = test_update_existing_key();
+    report.tests[i++] = test_delete_key();
+    report.tests[i++] = test_delete_nonexistent_key();
+    report.tests[i++] = test_collision_handling();
+    report.tests[i++] = test_empty_key();
+    report.tests[i++] = test_long_key();
+    report.tests[i++] = test_multiple_operations();
+    report.tests[i++] = test_null_value();
+    report.tests[i++] = test_large_capacity();
+    
+    return report;
+}

SLS_C/tests/lexer_test_helpers.c

@@ -9,17 +9,18 @@
 #include <stdio.h>
 #include <math.h>
 
-#include "sls/sls_errors.h"
+#include "sls/errors.h"
+#include "sls/bool.h"
 #include "sls/lexer.h"
 #include "sls/string.h"
 #include "tests/lexer_test_helpers.h"
 #include "tests/tests.h"
 
-static const double FLOAT_TEST_PRECISION = 0.01;
+static const double FLOAT_TEST_PRECISION = 0.0078125;
 
 // Test start and end helpers
 
-LexerTest start_up_test(const char *test_name, const char *test_code) {
+LexerTest start_up_test(SlsStr test_name, SlsStr test_code) {
     LexerTest test = (LexerTest) {
         .result = (TestResult) {
             .name = test_name, .status = TEST_NOT_IMPLEMENTED } };
@@ -32,45 +33,63 @@ void clean_up_test(LexerResult result) {
         clean_token_result(result.result);
 }
 
-TestResult error_test(LexerTest *test, LexerResult result, SlsError error) {
+TestResult error_test_out_of_mem(LexerTest *test) {
     test->result.status = TEST_ERROR;
-    test->result.error = error;
-    clean_up_test(result);
+    test->result.error = (SlsError){SLS_STR("Out Of Memory Error."), 1};
     return test->result;
 }
 
-TestResult logic_fail_test(LexerTest *test, LexerResult result, char *message) {
-    if (message == 0) return error_test(test, result, (SlsError) {
-        .message = "Out of Memory Error!", .code = 1, });
+TestResult error_test(LexerTest *test, LexerResult result, SlsError error) {
+    clean_up_test(result);
+
+    if (error.message.str == NULL) return error_test_out_of_mem(test);
+
+    test->result.status = TEST_ERROR;
+    test->result.error = error;
+    test->result.error.message = sls_str_cpy(error.message);
+
+    if (test->result.error.message.str == NULL) return error_test_out_of_mem(test);
+    return test->result;
+}
+
+TestResult logic_fail_test(LexerTest *test, LexerResult result, SlsStr message) {
+    clean_up_test(result);
+
     test->result.status = TEST_LOGIC_FAIL;
     test->result.message = message;
-    clean_up_test(result);
     return test->result;
 }
 
 TestResult logic_error_fail_test(LexerTest *test, LexerResult result, SlsError error) {
+    if (error.message.str == NULL) return error_test_out_of_mem(test);
+
     test->result.status = TEST_LOGIC_ERROR_FAIL;
     test->result.error = error;
-
-    size_t message_length = strlen(error.message) + 1;
-    const char *message = (char *)malloc(sizeof(char) * message_length);
-    strncpy(message, error.message, message_length);
-    test->result.error.message = message;
+    test->result.error.message = sls_str_cpy(error.message);
 
     clean_up_test(result);
+
+    if (test->result.error.message.str == NULL) return error_test_out_of_mem(test);
     return test->result;
 }
 
 TestResult error_fail_test(LexerTest *test, LexerResult result, SlsError error) {
+    clean_up_test(result);
+
+    if (error.message.str == NULL) return error_test_out_of_mem(test);
+
     test->result.status = TEST_ERROR_FAIL;
     test->result.error = error;
-    clean_up_test(result);
+    test->result.error.message = sls_str_cpy(error.message);
+
+    if (test->result.error.message.str == NULL) return error_test_out_of_mem(test);
     return test->result;
 }
 
 TestResult skip_test(LexerTest *test, LexerResult result) {
-    test->result.status = TEST_NOT_IMPLEMENTED;
     clean_up_test(result);
+
+    test->result.status = TEST_NOT_IMPLEMENTED;
     return test->result;
 }
 
@@ -80,198 +99,120 @@ TestResult skip_test_no_result(LexerTest *test) {
 }
 
 TestResult pass_test(LexerTest *test, LexerResult result) {
-    test->result.status = TEST_PASS;
     clean_up_test(result);
+
+    test->result.status = TEST_PASS;
     return test->result;
 }
 
 // Test messages
 
-static char *unexpected_end_of_token_stream(size_t i) {
-    size_t length = ceil(log10(i)) + 47;
-    char *string = (char *)malloc(sizeof(char) * length);
-    if (string == 0) return string;
-    snprintf(string, length, "Unexpected end of token stream (%zu tokens found)", i - 1);
-    return string;
+static SlsStr unexpected_end_of_token_stream(size_t i) {
+    return sls_format(SLS_STR("Unexpected end of token stream (%z tokens found)"), i - 1);
 }
 
-static char *expected_end_of_token_stream(size_t i) {
-    size_t length = ceil(log10(i)) + 47;
-    char *string = (char *)malloc(sizeof(char) * length);
-    if (string == 0) return string;
-    snprintf(string, length, "Expected end of token stream (more than %zu tokens found)", i - 1);
-    return string;
+static SlsStr expected_end_of_token_stream(size_t i) {
+    return sls_format(SLS_STR("Expected end of token stream (more than %z tokens found)"), i - 1);
 }
 
-static char *token_should_be(size_t i, TokenType should, TokenType found) {
-    size_t length = ceil(log10(i + 1)) + strnlen(TOKEN_TYPES_NAMES[should], TYPE_NAMES_SAFE_LENGTH) + strnlen(TOKEN_TYPES_NAMES[found], TYPE_NAMES_SAFE_LENGTH) + 35;
-    char *string = (char *)malloc(sizeof(char) * length);
-    if (string == 0) return string;
-    snprintf(string, length, "Token #%zu should be a %s, but found a %s", i, TOKEN_TYPES_NAMES[should], TOKEN_TYPES_NAMES[found]);
-    return string;
+static SlsStr token_should_be(size_t i, TokenType should, TokenType found) {
+    if (found >= TOKEN_TYPE_COUNT)
+        return sls_format(SLS_STR("Token #%z should be a %t, but found invalid enum %u"), i, should, (uint64_t)found);
+    else
+        return sls_format(SLS_STR("Token #%z should be a %t, but found a %t"), i, should, found);
 }
 
-static char *integer_type_should_be(size_t i, IntegerBuiltInType should, IntegerBuiltInType found) {
-    size_t length = ceil(log10(i + 1)) + strnlen(INTEGER_TYPES_NAMES[should], 5) + strnlen(INTEGER_TYPES_NAMES[found], 5) + 48;
-    char *string = (char *)malloc(sizeof(char) * length);
-    if (string == 0) return string;
-    snprintf(string, length, "Token #%zu integer type should be a %s, but found a %s", i, TOKEN_TYPES_NAMES[should], TOKEN_TYPES_NAMES[found]);
-    return string;
+static SlsStr integer_type_should_be(size_t i, IntegerBuiltInType should, IntegerBuiltInType found) {
+    if (found >= INTEGER_TYPE_COUNT)
+        return sls_format(SLS_STR("Token #%z integer type should be a %i, but found invalid enum %u"), i, should, (uint64_t)found);
+    else
+        return sls_format(SLS_STR("Token #%z integer type should be a %i, but found a %i"), i, should, found);
 }
 
-static char *integer_value_should_be(size_t i, uint64_t should, uint64_t found) {
-    size_t length = ceil(log10(i + 1)) + ceil(log10(should + 1)) + ceil(log10(found + 1)) + 45;
-    char *string = (char *)malloc(sizeof(char) * length);
-    if (string == 0) return string;
-    snprintf(string, length, "Token #%zu integer value should be %lu, but found %lu", i, should, found);
-    return string;
+static SlsStr integer_value_should_be(size_t i, uint64_t should, uint64_t found) {
+    return sls_format(SLS_STR("Token #%z integer value should be %u, but found %u"), i, should, found);
 }
 
-static char *float_value_should_be(size_t i, double should, double found) {
-    size_t length = ceil(log10(i + 1)) + ceil(log10(should + 1) + 3) + ceil(log10(found + 1) + 3) + 43;
-    char *string = (char *)malloc(sizeof(char) * length);
-    if (string == 0) return string;
-    snprintf(string, length, "Token #%zu float value should be %.2f, but found %.2f", i, should, found);
-    return string;
+static SlsStr character_value_should_be(size_t i, uint8_t should, uint8_t found) {
+    return sls_format(SLS_STR("Token #%z integer value should be %i, but found %i"), i, should, found);
 }
 
-static char *identifier_should_be_literal(size_t i) {
-    size_t length = ceil(log10(i + 1)) + 51;
-    char *string = (char *)malloc(sizeof(char) * length);
-    if (string == 0) return string;
-    snprintf(string, length, "Token #%zu identifier should be an identifier literal", i);
-    return string;
+static SlsStr float_value_should_be(size_t i, double should, double found) {
+    return sls_format(SLS_STR("Token #%z float value should be %f, but found %f"), i, should, found);
 }
 
-static char *identifier_should_not_be_literal(size_t i) {
-    size_t length = ceil(log10(i + 1)) + 55;
-    char *string = (char *)malloc(sizeof(char) * length);
-    if (string == 0) return string;
-    snprintf(string, length, "Token #%zu identifier should not be an identifier literal", i);
-    return string;
+static SlsStr identifier_should_be_literal(size_t i) {
+    return sls_format(SLS_STR("Token #%z identifier should be an identifier literal"), i);
 }
 
-static char *token_length_should_be(size_t i, TokenType type, uint64_t should, uint64_t found) {
-    size_t length = ceil(log10(i + 1)) + strnlen(TOKEN_TYPES_NAMES[type], TYPE_NAMES_SAFE_LENGTH) + ceil(log10(should + 1)) + ceil(log10(found + 1)) + 47;
-    char *string = (char *)malloc(sizeof(char) * length);
-    if (string == 0) return string;
-    snprintf(string, length, "Token #%zu of type %s length should be %lu, but found %lu", i, TOKEN_TYPES_NAMES[type], should, found);
-    return string;
+static SlsStr identifier_should_not_be_literal(size_t i) {
+    return sls_format(SLS_STR("Token #%z identifier should not be an identifier literal"), i);
 }
 
-static char *token_value_string_should_be(size_t i, TokenType type, size_t value_length, const char *should, const char *found) {
-    size_t length = ceil(log10(i + 1)) + strnlen(TOKEN_TYPES_NAMES[type], TYPE_NAMES_SAFE_LENGTH) + strnlen(should, value_length) + strnlen(found, value_length) + 53;
-    char *string = (char *)malloc(sizeof(char) * length);
-    if (string == 0) return string;
-    snprintf(string, length, "Token #%zu of type %s string value should be %s, but found %s", i, TOKEN_TYPES_NAMES[type], should, found);
-    return string;
+static SlsStr token_length_should_be(size_t i, TokenType type, uint64_t should, uint64_t found) {
+    return sls_format(SLS_STR("Token #%z of type %t length should be %u, but found %u"), i, type, should, found);
 }
 
-static char *boolean_should_be(size_t i, Boolean value) {
-    size_t length = ceil(log10(i + 1)) + 45;
-    char *string = (char *)malloc(sizeof(char) * length);
-    if (string == 0) return string;
-    if (value) snprintf(string, length, "Token #%zu boolean should be true, but is false", i);
-    else snprintf(string, length, "Token #%zu boolean should be false, but is true", i);
-    return string;
+static SlsStr token_value_string_should_be(size_t i, TokenType type, SlsStr should, SlsStr found) {
+    return sls_format(SLS_STR("Token #%z of type %t string value should be %s, but found %s"), i, type, should, found);
 }
 
-static char *array_type_should_be(size_t i, ArrayType should, ArrayType found) {
-    size_t length = ceil(log10(i + 1)) + strnlen(ARRAY_TYPES_NAMES[should], TYPE_NAMES_SAFE_LENGTH) + strnlen(ARRAY_TYPES_NAMES[found], TYPE_NAMES_SAFE_LENGTH) + 35;
-    char *string = (char *)malloc(sizeof(char) * length);
-    if (string == 0) return string;
-    snprintf(string, length, "Token #%zu should be a %s, but found a %s", i, ARRAY_TYPES_NAMES[should], ARRAY_TYPES_NAMES[found]);
-    return string;
+static SlsStr boolean_should_be(size_t i, Boolean value) {
+    if (value) return sls_format(SLS_STR("Token #%z boolean should be true, but is false"), i);
+    else return sls_format(SLS_STR("Token #%z boolean should be false, but is true"), i);
 }
 
-static char *array_dimensions_should_be(size_t i, size_t should, size_t found) {
-    size_t length = ceil(log10(i + 1)) + ceil(log10(should + 1)) + ceil(log10(found + 1)) + 48;
-    char *string = (char *)malloc(sizeof(char) * length);
-    if (string == 0) return string;
-    snprintf(string, length, "Token #%zu array dimensions should be %zu, but found %zu", i, should, found);
-    return string;
+static SlsStr array_type_should_be(size_t i, ArrayType should, ArrayType found) {
+    if (found >= ARRAY_TYPE_COUNT)
+        return sls_format(SLS_STR("Token #%z should be a %a, but found invalid enum %u"), i, should, (uint64_t)found);
+    else
+        return sls_format(SLS_STR("Token #%z should be a %a, but found a %a"), i, should, found);
 }
 
-static char *array_element_shape_should_be(size_t i, size_t j, ArrayType type, uint64_t should, uint64_t found) {
-    size_t length = ceil(log10(i + 1)) + ceil(log10(j + 1)) + strnlen(ARRAY_TYPES_NAMES[type], TYPE_NAMES_SAFE_LENGTH) + ceil(log10(should + 1) + 3) + ceil(log10(found + 1) + 3) + 63;
-    char *string = (char *)malloc(sizeof(char) * length);
-    if (string == 0) return string;
-    snprintf(string, length, "Token #%zu dimension %zu of array type %s should be shape %lu, but found %lu", i, j, TOKEN_TYPES_NAMES[type], should, found);
-    return string;
+static SlsStr array_dimensions_should_be(size_t i, size_t should, size_t found) {
+    return sls_format(SLS_STR("Token #%z array dimensions should be %z, but found %z"), i, should, found);
 }
 
-static char *array_element_integer_should_be(size_t i, size_t j, ArrayType type, uint64_t should, uint64_t found) {
-    size_t length = ceil(log10(i + 1)) + ceil(log10(j + 1)) + strnlen(ARRAY_TYPES_NAMES[type], TYPE_NAMES_SAFE_LENGTH) + ceil(log10(should + 1) + 3) + ceil(log10(found + 1) + 3) + 55;
-    char *string = (char *)malloc(sizeof(char) * length);
-    if (string == 0) return string;
-    snprintf(string, length, "Token #%zu element %zu of array type %s should be %lu, but found %lu", i, j, TOKEN_TYPES_NAMES[type], should, found);
-    return string;
+static SlsStr array_dimension_shape_should_be(size_t i, size_t j, ArrayType type, uint64_t should, uint64_t found) {
+    return sls_format(SLS_STR("Token #%z dimension %z of array type %a should be shape %u, but found %u"), i, j, type, should, found);
 }
 
-static char *array_element_float_should_be(size_t i, size_t j, ArrayType type, double should, double found) {
-    size_t length = ceil(log10(i + 1)) + ceil(log10(j + 1)) + strnlen(ARRAY_TYPES_NAMES[type], TYPE_NAMES_SAFE_LENGTH) + ceil(log10(should + 1)) + ceil(log10(found + 1)) + 55;
-    char *string = (char *)malloc(sizeof(char) * length);
-    if (string == 0) return string;
-    snprintf(string, length, "Token #%zu element %zu of array type %s should be %.2f, but found %.2f", i, j, TOKEN_TYPES_NAMES[type], should, found);
-    return string;
+static SlsStr array_element_integer_should_be(size_t i, size_t j, ArrayType type, uint64_t should, uint64_t found) {
+    return sls_format(SLS_STR("Token #%z element %z of array type %a should be %u, but found %u"), i, j, type, should, found);
 }
 
-static char *array_element_string_should_be(size_t i, size_t j, ArrayType type, size_t value_length, const char *should, const char *found) {
-    size_t length = ceil(log10(i + 1)) + ceil(log10(j + 1)) + strnlen(ARRAY_TYPES_NAMES[type], TYPE_NAMES_SAFE_LENGTH) + strnlen(should, value_length) + strnlen(found, value_length) + 55;
-    char *string = (char *)malloc(sizeof(char) * length);
-    if (string == 0) return string;
-    snprintf(string, length, "Token #%zu element %zu of array type %s should be %s, but found %s", i, j, TOKEN_TYPES_NAMES[type], should, found);
-    return string;
+static SlsStr array_element_float_should_be(size_t i, size_t j, ArrayType type, double should, double found) {
+    return sls_format(SLS_STR("Token #%z element %z of array type %a should be %f, but found %f"), i, j, type, should, found);
 }
 
-static char *array_element_boolean_should_be(size_t i, size_t j, ArrayType type, Boolean value) {
-    size_t length = ceil(log10(i + 1)) + ceil(log10(j + 1)) + strnlen(ARRAY_TYPES_NAMES[type], TYPE_NAMES_SAFE_LENGTH) + 64;
-    char *string = (char *)malloc(sizeof(char) * length);
-    if (string == 0) return string;
-    if (value) snprintf(string, length, "Token #%zu element %zu of array type %s should be true, but found false", i, j, TOKEN_TYPES_NAMES[type]);
-    else snprintf(string, length, "Token #%zu element %zu of array type %s should be false, but found true", i, j, TOKEN_TYPES_NAMES[type]);
-    return string;
+static SlsStr array_element_string_should_be(size_t i, size_t j, ArrayType type, SlsStr should, SlsStr found) {
+    return sls_format(SLS_STR("Token #%z element %z of array type %a should be %s, but found %s"), i, j, type, should, found);
 }
 
-static char *type_tuple_element_integer_should_be(size_t i, size_t j, uint64_t should, uint64_t found) {
-    size_t length = ceil(log10(i + 1)) + ceil(log10(j + 1)) + ceil(log10(should + 1) + 3) + ceil(log10(found + 1) + 3) + 54;
-    char *string = (char *)malloc(sizeof(char) * length);
-    if (string == 0) return string;
-    snprintf(string, length, "Token #%zu element %zu of type tuple should be %lu, but found %lu", i, j, should, found);
-    return string;
+static SlsStr array_element_boolean_should_be(size_t i, size_t j, ArrayType type, Boolean value) {
+    if (value) return sls_format(SLS_STR("Token #%z element %z of array type %a should be true, but is false"), i, j, type);
+    else return sls_format(SLS_STR("Token #%z element %z of array type %a should be false, but is true"), i, j, type);
 }
 
-static char *type_tuple_element_string_should_be(size_t i, size_t j, size_t value_length, const char *should, const char *found) {
-    size_t length = ceil(log10(i + 1)) + ceil(log10(j + 1)) + strnlen(should, value_length) + strnlen(found, value_length) + 54;
-    char *string = (char *)malloc(sizeof(char) * length);
-    if (string == 0) return string;
-    snprintf(string, length, "Token #%zu element %zu of type tuple should be %s, but found %s", i, j, should, found);
-    return string;
+static SlsStr type_tuple_element_integer_should_be(size_t i, size_t j, uint64_t should, uint64_t found) {
+    return sls_format(SLS_STR("Token #%z element %u of type tuple should be %u, but found %u"), i, j, should, found);
 }
 
-static char *type_tuple_element_boolean_should_be(size_t i, size_t j, Boolean value) {
-    size_t length = ceil(log10(i + 1)) + ceil(log10(j + 1)) + 63;
-    char *string = (char *)malloc(sizeof(char) * length);
-    if (string == 0) return string;
-    if (value) snprintf(string, length, "Token #%zu element %zu of type tuple should be true, but found false", i, j);
-    else snprintf(string, length, "Token #%zu element %zu of type tuple should be false, but found true", i, j);
-    return string;
+static SlsStr type_tuple_element_string_should_be(size_t i, size_t j, SlsStr should, SlsStr found) {
+    return sls_format(SLS_STR("Token #%z element %z of type tuple should be %s, but found %s"), i, j, should, found);
 }
 
-static char *token_should_be_error(size_t i, TestErrorMessage should, TokenType found) {
-    size_t length = ceil(log10(i + 1)) + should.length + strnlen(TOKEN_TYPES_NAMES[found], TYPE_NAMES_SAFE_LENGTH) + 72;
-    char *string = (char *)malloc(sizeof(char) * length);
-    if (string == 0) return string;
-    snprintf(string, length, "Token #%zu should be an error with a message of %s, but found token of type %s", i, should.message, TOKEN_TYPES_NAMES[found]);
-    return string;
+static SlsStr type_tuple_element_boolean_should_be(size_t i, size_t j, Boolean value) {
+    if (value) return sls_format(SLS_STR("Token #%z element %z of type tuple should be true, but is false"), i, j);
+    else return sls_format(SLS_STR("Token #%z element %z of type tuple should be false, but is true"), i, j);
 }
 
-static char *error_should_be(size_t i, TestErrorMessage should, SlsError found) {
-    size_t length = ceil(log10(i + 1)) + should.length + strlen(found.message) + 77;
-    char *string = (char *)malloc(sizeof(char) * length);
-    if (string == 0) return string;
-    snprintf(string, length, "Token #%zu should be an error with a message of %s, but found error with message %s", i, should.message, found.message);
-    return string;
+static SlsStr token_should_be_error(size_t i, SlsStr should, TokenType found) {
+    return sls_format(SLS_STR("Token #%z should be an error with a message of \"%s\", but found token of type %t"), i, should, found);
+}
+
+static SlsStr error_should_be(size_t i, SlsStr should, SlsError found) {
+    return sls_format(SLS_STR("Token #%z should be an error with a message of \"%s\", but found error with message \"%e\""), i, should, found);
 }
 
 // Test parts
@@ -304,7 +245,7 @@ static Boolean test_array_type(LexerTest *test, LexerResult result, size_t i, Ar
     }
     for (size_t j = 0; j < dimensions; j++) {
         if (head->result.array_literal.shape[j] != shape[j]) {
-            logic_fail_test(test, result, array_element_shape_should_be(i + 1, j, array_type, shape[j], head->result.array_literal.shape[j]));
+            logic_fail_test(test, result, array_dimension_shape_should_be(i + 1, j, array_type, shape[j], head->result.array_literal.shape[j]));
             return TRUE;
         }
     }
@@ -332,11 +273,11 @@ Boolean test_identifier_value(LexerTest *test, LexerResult result, size_t i, Tes
     } if (head->result.identifier.is_literal != value->is_literal) {
         logic_fail_test(test, result, value->is_literal ? identifier_should_be_literal(i + 1) : identifier_should_not_be_literal(i + 1));
         return TRUE;
-    } if (head->result.identifier.length == strnlen(value->name, value->length)) {
-        logic_fail_test(test, result, token_length_should_be(i + 1, token_type, strnlen(value->name, value->length), head->result.identifier.length));
+    } if (head->result.identifier.name.len != value->name.len) {
+        logic_fail_test(test, result, token_length_should_be(i + 1, token_type, value->name.len, head->result.identifier.name.len));
         return TRUE;
-    } if (strncmp(head->result.identifier.name, value->name, value->length) != 0) {
-        logic_fail_test(test, result, token_value_string_should_be(i + 1, token_type, strnlen(value->name, value->length), head->result.identifier.name, value->name));
+    } if (sls_str_cmp(head->result.identifier.name, value->name) != 0) {
+        logic_fail_test(test, result, token_value_string_should_be(i + 1, token_type, head->result.identifier.name, value->name));
         return TRUE;
     }
     return FALSE;
@@ -357,6 +298,18 @@ Boolean test_integer_value(LexerTest *test, LexerResult result, size_t i, TestIn
     return FALSE;
 }
 
+Boolean test_character_value(LexerTest *test, LexerResult result, size_t i, uint8_t *value) {
+    static const TokenType token_type = TOKEN_CHARACTER;
+    LexerTokenResult *head = get_token(result.result, i);
+    if (test_token_type(test, result, i, token_type)) {
+        return TRUE;
+    } if (head->result.integer_literal.value != *value) {
+        logic_fail_test(test, result, character_value_should_be(i + 1, *value, head->result.float_literal));
+        return TRUE;
+    }
+    return FALSE;
+}
+
 Boolean test_float_value(LexerTest *test, LexerResult result, size_t i, float *value) {
     static const TokenType token_type = TOKEN_FLOAT;
     LexerTokenResult *head = get_token(result.result, i);
@@ -374,23 +327,23 @@ Boolean test_double_value(LexerTest *test, LexerResult result, size_t i, double
     LexerTokenResult *head = get_token(result.result, i);
     if (test_token_type(test, result, i, token_type)) {
         return TRUE;
-    } if (fabs(head->result.float_literal - *value) >= FLOAT_TEST_PRECISION) {
-        logic_fail_test(test, result, float_value_should_be(i + 1, *value, head->result.float_literal));
+    } if (fabs(head->result.double_literal - *value) >= FLOAT_TEST_PRECISION) {
+        logic_fail_test(test, result, float_value_should_be(i + 1, *value, head->result.double_literal));
         return TRUE;
     }
     return FALSE;
 }
 
-Boolean test_string_value(LexerTest *test, LexerResult result, size_t i, TestStringValue *value) {
+Boolean test_string_value(LexerTest *test, LexerResult result, size_t i, SlsStr *value) {
     static const TokenType token_type = TOKEN_STRING;
     LexerTokenResult *head = get_token(result.result, i);
     if (test_token_type(test, result, i, token_type)) {
         return TRUE;
-    } if (head->result.string_literal.length == strnlen(value->string, value->length)) {
-        logic_fail_test(test, result, token_length_should_be(i + 1, token_type, strnlen(value->string, value->length), head->result.string_literal.length));
+    } if (head->result.string_literal.len == value->len) {
+        logic_fail_test(test, result, token_length_should_be(i + 1, token_type, value->len, head->result.string_literal.len));
         return TRUE;
-    } if (strncmp(head->result.string_literal.value, value->string, value->length) != 0) {
-        logic_fail_test(test, result, token_value_string_should_be(i + 1, token_type, fmax(strnlen(value->string, value->length), strnlen(head->result.string_literal.value, value->length)), value->string, head->result.string_literal.value));
+    } if (sls_str_cmp(head->result.string_literal, *value) != 0) {
+        logic_fail_test(test, result, token_value_string_should_be(i + 1, token_type, *value, head->result.string_literal));
         return TRUE;
     }
     return FALSE;
@@ -417,11 +370,11 @@ Boolean test_array_identifier_value(LexerTest *test, LexerResult result, size_t
     size_t length = 1;
     for (size_t j = 0; j < values->dimensions; j++) length *= values->shape[j];
     for (size_t j = 0; j < length; j++) {
-        if (head->result.array_literal.identifiers[j].length == values->values[j].length) {
-            logic_fail_test(test, result, array_element_integer_should_be(i + 1, j, array_type, values->values[j].length, head->result.array_literal.identifiers[j].length));
+        if (head->result.array_literal.identifiers[j].name.len == values->values[j].name.len) {
+            logic_fail_test(test, result, array_element_integer_should_be(i + 1, j, array_type, values->values[j].name.len, head->result.array_literal.identifiers[j].name.len));
             return TRUE;
-        } if (strncmp(head->result.array_literal.identifiers[j].name, values->values[j].name, values->values[j].length)) {
-            logic_fail_test(test, result, array_element_string_should_be(i + 1, j, array_type, values->values[j].length, values->values[j].name, head->result.array_literal.identifiers[j].name));
+        } if (sls_str_cmp(head->result.array_literal.identifiers[j].name, values->values[j].name)) {
+            logic_fail_test(test, result, array_element_string_should_be(i + 1, j, array_type, values->values[j].name, head->result.array_literal.identifiers[j].name));
             return TRUE;
         } if (head->result.array_literal.identifiers[j].is_literal) {
             logic_fail_test(test, result, array_element_boolean_should_be(i + 1, j, array_type, TRUE));
@@ -491,11 +444,11 @@ Boolean test_array_string_value(LexerTest *test, LexerResult result, size_t i, T
     size_t length = 1;
     for (size_t j = 0; j < values->dimensions; j++) length *= values->shape[j];
     for (size_t j = 0; j < length; j++) {
-        if (head->result.array_literal.string_literals[j].length == values->values[j].length) {
-            logic_fail_test(test, result, array_element_integer_should_be(i + 1, j, array_type, values->values[j].length, head->result.array_literal.string_literals[j].length));
+        if (head->result.array_literal.string_literals[j].len == values->values[j].len) {
+            logic_fail_test(test, result, array_element_integer_should_be(i + 1, j, array_type, values->values[j].len, head->result.array_literal.string_literals[j].len));
             return TRUE;
-        } if (strncmp(head->result.array_literal.string_literals[j].value, values->values[j].string, values->values[j].length)) {
-            logic_fail_test(test, result, array_element_string_should_be(i + 1, j, array_type, values->values[j].length, values->values[j].string, head->result.array_literal.string_literals[j].value));
+        } if (sls_str_cmp(head->result.array_literal.string_literals[j], values->values[j])) {
+            logic_fail_test(test, result, array_element_string_should_be(i + 1, j, array_type, values->values[j], head->result.array_literal.string_literals[j]));
             return TRUE;
         }
     }
@@ -524,8 +477,8 @@ Boolean test_array_struct_inline_value(LexerTest *test, LexerResult result, size
     LexerTokenResult *head = get_token(result.result, i);
     if (test_array_type(test, result, i, array_type, values->shape, values->dimensions)) {
         return TRUE;
-    } if (strncmp(head->result.array_literal.struct_inline.name, values->struct_name, values->struct_name_length)) {
-        logic_fail_test(test, result, token_value_string_should_be(i + 1, TOKEN_IDENTIFIER, values->struct_name_length, values->struct_name, head->result.array_literal.struct_inline.name));
+    } if (sls_str_cmp(head->result.array_literal.struct_inline.name, values->struct_name)) {
+        logic_fail_test(test, result, token_value_string_should_be(i + 1, TOKEN_IDENTIFIER, values->struct_name, head->result.array_literal.struct_inline.name));
         return TRUE;
     }
     size_t length = 1;
@@ -541,9 +494,38 @@ Boolean test_array_struct_inline_value(LexerTest *test, LexerResult result, size
 static LexerResult token_string_to_lexer_result(TokenString token_string, FileInfo file_info) {
     LexerTokenResult *new, *head;
     head = 0;
-    for (size_t i = 0; i> token_string.length; i++) {
+    for (size_t i = token_string.length; i > 0; i--) {
         new = (LexerTokenResult *)malloc(sizeof(LexerTokenResult));
-        *new = (LexerTokenResult) { .type = SLS_RESULT, .result = token_string.tokens[i], .file_info = file_info, .next = head };
+        if (new == 0) return (LexerResult) { .type = SLS_ERROR, .error = (SlsError){SLS_STR("Out Of Memory Error."), 1} };
+        if (token_string.tokens[i-1].type == TOKEN_STRING) {
+            *new = (LexerTokenResult) {
+                .type = SLS_RESULT,
+                .result = (Token){
+                    .type = TOKEN_STRING,
+                    .string_literal = sls_str_cpy(token_string.tokens[i-1].string_literal)
+                },
+                .file_info = file_info,
+                .next = head
+            };
+        } else if (token_string.tokens[i-1].type == TOKEN_TOKEN_STRING) {
+            *new = (LexerTokenResult) {
+                .type = SLS_RESULT,
+                .result = (Token){
+                    .type = TOKEN_TOKEN_STRING,
+                    .token_string = copy_token_string(token_string.tokens[i-1].token_string)
+                },
+                .file_info = file_info,
+                .next = head
+            };
+            memcpy(new->result.token_string.tokens, token_string.tokens[i-1].token_string.tokens, token_string.tokens[i-1].token_string.length);
+        } else {
+            *new = (LexerTokenResult) {
+                .type = SLS_RESULT,
+                .result = token_string.tokens[i-1],
+                .file_info = file_info,
+                .next = head
+            };
+        }
         head = new;
     }
     return (LexerResult) { .type = SLS_RESULT, .result = head };
@@ -561,7 +543,8 @@ Boolean test_token_string_value(LexerTest *test, LexerResult result, size_t i, T
     for (size_t j = 0; j < values->tokens; j++) {
         LexerResult token_string_result = token_string_to_lexer_result(head->result.token_string, head->file_info);
         if (values->values[j].token_handler(test, token_string_result, j, values->values[j].value)) {
-            clean_token_result(token_string_result.result);
+            // We do not clean up here because if token_handler fails the test, it cleans up for us.
+            // clean_token_result(token_string_result.result);
             return TRUE;
         }
         clean_token_result(token_string_result.result);
@@ -581,22 +564,22 @@ Boolean test_type_tuple_value(LexerTest *test, LexerResult result, size_t i, Tes
         logic_fail_test(test, result, token_length_should_be(i + 1, token_type, values->output_length, head->result.type_tuple.output_length));
         return TRUE;
     } for (size_t j = 0; j < values->input_length; j++) {
-        if (head->result.type_tuple.input_identifiers[j].length == values->input_values[j].length) {
-            logic_fail_test(test, result, type_tuple_element_integer_should_be(i + 1, j, values->input_values[j].length, head->result.type_tuple.input_identifiers[j].length));
+        if (head->result.type_tuple.input_identifiers[j].name.len == values->input_values[j].name.len) {
+            logic_fail_test(test, result, type_tuple_element_integer_should_be(i + 1, j, values->input_values[j].name.len, head->result.type_tuple.input_identifiers[j].name.len));
             return TRUE;
-        } if (strncmp(head->result.type_tuple.input_identifiers[j].name, values->input_values[j].name, values->input_values[j].length)) {
-            logic_fail_test(test, result, type_tuple_element_string_should_be(i + 1, j, values->input_values[j].length, values->input_values[j].name, head->result.type_tuple.input_identifiers[j].name));
+        } if (sls_str_cmp(head->result.type_tuple.input_identifiers[j].name, values->input_values[j].name)) {
+            logic_fail_test(test, result, type_tuple_element_string_should_be(i + 1, j, values->input_values[j].name, head->result.type_tuple.input_identifiers[j].name));
             return TRUE;
         } if (head->result.type_tuple.input_identifiers[j].is_literal) {
             logic_fail_test(test, result, type_tuple_element_boolean_should_be(i + 1, j, TRUE));
             return TRUE;
         }
     } for (size_t j = 0; j < values->output_length; j++) {
-        if (head->result.type_tuple.output_identifiers[j].length == values->output_values[j].length) {
-            logic_fail_test(test, result, type_tuple_element_integer_should_be(i + 1, j, values->output_values[j].length, head->result.type_tuple.output_identifiers[j].length));
+        if (head->result.type_tuple.output_identifiers[j].name.len == values->output_values[j].name.len) {
+            logic_fail_test(test, result, type_tuple_element_integer_should_be(i + 1, j, values->output_values[j].name.len, head->result.type_tuple.output_identifiers[j].name.len));
             return TRUE;
-        } if (strncmp(head->result.type_tuple.output_identifiers[j].name, values->output_values[j].name, values->input_values[j].length)) {
-            logic_fail_test(test, result, type_tuple_element_string_should_be(i + 1, j, values->output_values[j].length, values->output_values[j].name, head->result.type_tuple.output_identifiers[j].name));
+        } if (sls_str_cmp(head->result.type_tuple.output_identifiers[j].name, values->output_values[j].name)) {
+            logic_fail_test(test, result, type_tuple_element_string_should_be(i + 1, j, values->output_values[j].name, head->result.type_tuple.output_identifiers[j].name));
             return TRUE;
         } if (head->result.type_tuple.output_identifiers[j].is_literal) {
             logic_fail_test(test, result, type_tuple_element_boolean_should_be(i + 1, j, TRUE));
@@ -606,12 +589,12 @@ Boolean test_type_tuple_value(LexerTest *test, LexerResult result, size_t i, Tes
     return FALSE;
 }
 
-Boolean test_for_error(LexerTest *test, LexerResult result, size_t i, TestErrorMessage *error) {
+Boolean test_for_error(LexerTest *test, LexerResult result, size_t i, SlsStr *error) {
     LexerTokenResult *head = get_token(result.result, i);
     if (head->type != SLS_ERROR) {
         logic_fail_test(test, result, token_should_be_error(i + 1, *error, head->result.type));
         return TRUE;
-    } if (strncmp(head->error.message, error->message, error->length+1) != 0) {
+    } if (sls_str_cmp(head->error.message, *error) != 0) {
         logic_fail_test(test, result, error_should_be(i + 1, *error, head->error));
         return TRUE;
     }

SLS_C/tests/string_tests.c

@@ -0,0 +1,224 @@
+// Kyler Olsen
+// YREA SLS
+// String Tests
+// November 2025
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdint.h>
+
+#include "sls/string.h"
+#include "sls/lexer.h"
+#include "sls/errors.h"
+#include "tests/tests.h"
+
+static const size_t NUM_STRING_TESTS = 10;
+
+static TestResult pass_string_test(SlsStr test_name) {
+    TestResult result = {.name = test_name, .status = TEST_NOT_IMPLEMENTED};
+    result.status = TEST_PASS;
+    return result;
+}
+
+static TestResult fail_string_test(SlsStr test_name, SlsStr message) {
+    TestResult result = { .name = test_name, .status = TEST_NOT_IMPLEMENTED };
+    result.status = TEST_ERROR;
+    result.message = sls_str_cpy(message);
+
+    if (result.message.str == NULL) {
+        result.error = (SlsError){ SLS_STR("Out Of Memory Error."), 1 };
+        result.status = TEST_ERROR;
+    }
+    return result;
+}
+
+// Test sls_str_malloc and sls_str_cpy
+static TestResult test_malloc_and_copy() {
+    const char* original = "Hello, SLS!";
+    SlsStr s = sls_str_malloc(original, strlen(original));
+    if (!s.str) return fail_string_test(SLS_STR("test_malloc_and_copy"), SLS_STR("Allocation failed"));
+
+    if (strcmp(s.str, original) != 0) {
+        sls_str_free(&s);
+        return fail_string_test(SLS_STR("test_malloc_and_copy"), SLS_STR("Copied string mismatch"));
+    }
+
+    SlsStr copy = sls_str_cpy(s);
+    if (!copy.str || strcmp(copy.str, original) != 0) {
+        sls_str_free(&s);
+        sls_str_free(&copy);
+        return fail_string_test(SLS_STR("test_malloc_and_copy"), SLS_STR("sls_str_cpy failed"));
+    }
+
+    sls_str_free(&s);
+    sls_str_free(&copy);
+    return pass_string_test(SLS_STR("test_malloc_and_copy"));
+}
+
+// Test sls_str_cmp
+static TestResult test_compare_strings() {
+    SlsStr a = sls_str_malloc("abc", 3);
+    SlsStr b = sls_str_malloc("abc", 3);
+    SlsStr c = sls_str_malloc("abd", 3);
+
+    if (sls_str_cmp(a, b) != 0) goto fail;
+    if (sls_str_cmp(a, c) >= 0) goto fail;
+    if (sls_str_cmp(c, a) <= 0) goto fail;
+
+    sls_str_free(&a);
+    sls_str_free(&b);
+    sls_str_free(&c);
+    return pass_string_test(SLS_STR("test_compare_strings"));
+
+fail:
+    sls_str_free(&a);
+    sls_str_free(&b);
+    sls_str_free(&c);
+    return fail_string_test(SLS_STR("test_compare_strings"), SLS_STR("Comparison test failed"));
+}
+
+// Test sls_format for basic placeholders
+static TestResult test_format_basic_placeholders() {
+    SlsStr fmt = SLS_STR("Char: %c, Int: %d, Long: %l, Unsigned: %u, Size: %z, Float: %f, C-String: %y");
+    const char *s = "Test";
+    SlsStr result = sls_format(fmt, 'X', -42, (int64_t)1234567890123, (uint64_t)9876543210, (size_t)1024, 3.14, s);
+
+    if (!result.str) return fail_string_test(SLS_STR("test_format_basic_placeholders"), SLS_STR("Formatting returned NULL"));
+
+    const char* expected = "Char: X, Int: -42, Long: 1234567890123, Unsigned: 9876543210, Size: 1024, Float: 3.14, C-String: Test";
+    if (strcmp(result.str, expected) != 0) {
+        sls_str_free(&result);
+        return fail_string_test(SLS_STR("test_format_basic_placeholders"), SLS_STR("Formatted string mismatch"));
+    }
+
+    sls_str_free(&result);
+    return pass_string_test(SLS_STR("test_format_basic_placeholders"));
+}
+
+// Test sls_format for SLS types: %s, %t, %a, %i, %e, %b
+static TestResult test_format_sls_types() {
+    // Placeholder values
+    SlsStr sls_str_val = SLS_STR("SLS_STRING");
+    TokenType tok = 0;       // Assuming TOKEN_TYPES_NAMES[0] exists
+    ArrayType arr = 0;       // Assuming ARRAY_TYPES_NAMES[0] exists
+    IntegerBuiltInType ib = 0; // Assuming INTEGER_TYPES_NAMES[0] exists
+    SlsError err = {SLS_STR("ErrorMessage"), 1};
+    Boolean boolean_true = TRUE;
+
+    SlsStr fmt = SLS_STR("Str:%s Tok:%t Arr:%a IntType:%i Err:%e Bool:%b");
+    SlsStr result = sls_format(fmt, sls_str_val, tok, arr, ib, err, boolean_true);
+
+    if (!result.str) return fail_string_test(SLS_STR("test_format_sls_types"), SLS_STR("Formatting returned NULL"));
+
+    char expected[256];
+    snprintf(expected, 256, "Str:%s Tok:%s Arr:%s IntType:%s Err:%s Bool:TRUE",
+             sls_str_val.str,
+             TOKEN_TYPES_NAMES[tok],
+             ARRAY_TYPES_NAMES[arr],
+             INTEGER_TYPES_NAMES[ib],
+             err.message.str);
+
+    if (strcmp(result.str, expected) != 0) {
+        sls_str_free(&result);
+        return fail_string_test(SLS_STR("test_format_sls_types"), SLS_STR("Formatted string mismatch for SLS types"));
+    }
+
+    sls_str_free(&result);
+    return pass_string_test(SLS_STR("test_format_sls_types"));
+}
+
+// Test sls_format with %% escape
+static TestResult test_format_percent_escape() {
+    SlsStr fmt = SLS_STR("Progress: 100%% complete");
+    SlsStr result = sls_format(fmt);
+
+    if (!result.str) return fail_string_test(SLS_STR("test_format_percent_escape"), SLS_STR("Formatting returned NULL"));
+    if (strcmp(result.str, "Progress: 100% complete") != 0) {
+        sls_str_free(&result);
+        return fail_string_test(SLS_STR("test_format_percent_escape"), SLS_STR("Percent escape failed"));
+    }
+
+    sls_str_free(&result);
+    return pass_string_test(SLS_STR("test_format_percent_escape"));
+}
+
+// Test sls_str_new allocation and zero-init
+static TestResult test_new_string_allocation() {
+    SlsStr s = sls_str_new(10);
+    if (!s.str) return fail_string_test(SLS_STR("test_new_string_allocation"), SLS_STR("Allocation failed"));
+
+    for (size_t i = 0; i < s.len; i++) {
+        if (s.str[i] != 0) {
+            sls_str_free(&s);
+            return fail_string_test(SLS_STR("test_new_string_allocation"), SLS_STR("Memory not zero-initialized"));
+        }
+    }
+
+    sls_str_free(&s);
+    return pass_string_test(SLS_STR("test_new_string_allocation"));
+}
+
+// Test empty string
+static TestResult test_empty_string() {
+    SlsStr s = sls_str_malloc("", 0);
+    if (!s.str || s.len != 0) return fail_string_test(SLS_STR("test_empty_string"), SLS_STR("Empty string allocation failed"));
+    sls_str_free(&s);
+    return pass_string_test(SLS_STR("test_empty_string"));
+}
+
+// Test long string
+static TestResult test_long_string() {
+    size_t len = 1024;
+    char* long_str = malloc(len + 1);
+    for (size_t i = 0; i < len; i++) long_str[i] = 'A';
+    long_str[len] = '\0';
+
+    SlsStr s = sls_str_malloc(long_str, len);
+    if (!s.str || s.len != len) {
+        free(long_str);
+        return fail_string_test(SLS_STR("test_long_string"), SLS_STR("Long string allocation failed"));
+    }
+
+    sls_str_free(&s);
+    free(long_str);
+    return pass_string_test(SLS_STR("test_long_string"));
+}
+
+// Test NULL pointer handling in sls_str_free
+static TestResult test_free_null() {
+    SlsStr s = SLS_STR_NULL;
+    sls_str_free(&s); // Should safely do nothing
+    return pass_string_test(SLS_STR("test_free_null"));
+}
+
+// Test sls_str_nlen edge cases
+static TestResult test_str_nlen_edge() {
+    const char* str = "ABCDE";
+    if (sls_str_nlen(str, 0) != 0) return fail_string_test(SLS_STR("test_str_nlen_edge"), SLS_STR("Maxlen=0 failed"));
+    if (sls_str_nlen(str, 3) != 3) return fail_string_test(SLS_STR("test_str_nlen_edge"), SLS_STR("Maxlen=3 failed"));
+    if (sls_str_nlen(str, 10) != 5) return fail_string_test(SLS_STR("test_str_nlen_edge"), SLS_STR("Maxlen>strlen failed"));
+    return pass_string_test(SLS_STR("test_str_nlen_edge"));
+}
+
+// Run all string tests
+TestsReport run_string_tests() {
+    TestsReport report = {
+        .section = SLS_STR("string_tests"),
+        .count = NUM_STRING_TESTS,
+        .tests = malloc(sizeof(TestResult) * NUM_STRING_TESTS)
+    };
+
+    size_t i = 0;
+    report.tests[i++] = test_malloc_and_copy();
+    report.tests[i++] = test_compare_strings();
+    report.tests[i++] = test_format_basic_placeholders();
+    report.tests[i++] = test_format_sls_types();
+    report.tests[i++] = test_format_percent_escape();
+    report.tests[i++] = test_new_string_allocation();
+    report.tests[i++] = test_empty_string();
+    report.tests[i++] = test_long_string();
+    report.tests[i++] = test_free_null();
+    report.tests[i++] = test_str_nlen_edge();
+    return report;
+}

SLS_C/tests/tests.c

@@ -7,9 +7,12 @@
 #include <string.h>
 #include <stdlib.h>
 
+#include "sls/errors.h"
 #include "tests/tests.h"
 
-const char *TEST_FILE_NAME = "TEST_FILE.SLS";
+static const Boolean PRINT_SUCCESSFUL_TESTS = FALSE;
+
+const SlsStr TEST_FILE_NAME = SLS_STR_CONST("TEST_FILE.SLS");
 
 typedef struct {
     uint16_t errored;
@@ -21,45 +24,46 @@ typedef struct {
     uint16_t total;
 } TestCounts;
 
-static void lexer_test_report(TestsReport reports, TestCounts *counts) {
+static void test_report(TestsReport reports, TestCounts *counts) {
     counts->total += reports.count;
     for (size_t i = 0; i < reports.count; i++) {
         switch (reports.tests[i].status) {
         case TEST_ERROR:
             // Bright Red
-            printf("\x1b[91mTest errored: %s\n\t%s\n\x1b[0m", reports.tests[i].name, reports.tests[i].error.message);
+            printf("\x1b[91mTest errored: %s\n\t%s\n\x1b[0m", reports.tests[i].name.str, reports.tests[i].error.message.str);
             counts->errored += 1;
             break;
         case TEST_ERROR_FAIL:
             // Magenta
-            printf("\x1b[35mLexing errored: %s\n\t%s\n\x1b[0m", reports.tests[i].name, reports.tests[i].error.message);
+            printf("\x1b[35mLexing errored: %s\n\t%s\n\x1b[0m", reports.tests[i].name.str, reports.tests[i].error.message.str);
             counts->error_failed += 1;
             break;
         case TEST_LOGIC_ERROR_FAIL:
             // Red
-            printf("\x1b[31mTest failed with lexical error: %s\n\t%s\n\x1b[0m", reports.tests[i].name, reports.tests[i].error.message);
+            printf("\x1b[31mTest failed with lexical error: %s\n\t%s\n\x1b[0m", reports.tests[i].name.str, reports.tests[i].error.message.str);
             counts->logic_error_failed += 1;
-            free(reports.tests[i].message);
+            sls_str_free(&reports.tests[i].message);
             break;
         case TEST_LOGIC_FAIL:
             // Red
-            printf("\x1b[31mTest failed: %s\n\t%s\n\x1b[0m", reports.tests[i].name, reports.tests[i].message);
+            printf("\x1b[31mTest failed: %s\n\t%s\n\x1b[0m", reports.tests[i].name.str, reports.tests[i].message.str);
             counts->logic_failed += 1;
-            free(reports.tests[i].message);
+            sls_str_free(&reports.tests[i].message);
             break;
         case TEST_PASS:
             // Green
-            printf("\x1b[32mTest passed: %s\n\x1b[0m", reports.tests[i].name);
+            if (PRINT_SUCCESSFUL_TESTS)
+                printf("\x1b[32mTest passed: %s\n\x1b[0m", reports.tests[i].name.str);
             counts->passed += 1;
             break;
         case TEST_NOT_IMPLEMENTED:
             // Blue
-            printf("\x1b[34mTest not implemented: %s\n\x1b[0m", reports.tests[i].name);
+            printf("\x1b[34mTest not implemented: %s\n\x1b[0m", reports.tests[i].name.str);
             counts->not_implemented += 1;
             break;
         default:
             // Bright Red
-            printf("\x1b[91mTest errored: %s\n\tUnknown test result status.\n\x1b[0m", reports.tests[i].name);
+            printf("\x1b[91mTest errored: %s\n\tUnknown test result status.\n\x1b[0m", reports.tests[i].name.str);
             counts->errored += 1;
             break;
         }
@@ -77,10 +81,16 @@ int main(void) {
         .total = 0,
     };
 
-    TestsReport lexer_reports = run_lexer_tests();
-    lexer_test_report(lexer_reports, &counts);
+    printf("    ========== SlsStr Tests ==========\n");
+    test_report(run_string_tests(), &counts);
+    printf("    ========== Lexer Tests ==========\n");
+    test_report(run_lexer_tests(), &counts);
+    printf("    ========== Hash Table Tests ==========\n");
+    test_report(run_hash_table_tests(), &counts);
+    printf("    ========== Extra Tests ==========\n");
+    test_report(run_extra_tests(), &counts);
 
-    printf(" ===== Tests Overview =====\n");
+    printf("    ========== Tests Overview ==========\n");
     if (counts.errored > 0)
         // Bright Red
         printf("\x1b[91m%d of %d tests encountered an error.\n\x1b[0m", counts.errored, counts.total);

SLS_Python/.gitignore

@@ -0,0 +1,4 @@
+__pycache__/
+.venv/
+sls_python.egg-info/
+dist/

SLS_Python/README.md

@@ -0,0 +1,19 @@
+# SLS Python
+
+This is the Python implementation for the YREA SLS interpreter.
+
+## Building
+
+```bash
+cd SLS_Python
+python -m venv .venv
+source .venv/bin/activate
+
+pip install build wheel "setuptools>=61.0"
+
+# Install the backend (one-time setup)
+pip install -e sls_build_backend
+
+# Build with --no-isolation (required because backend is local)
+python -m build --no-isolation
+```

SLS_Python/pyproject.toml

@@ -0,0 +1,20 @@
+# Build this file using 'python -m build --no-isolation'
+[build-system]
+requires = ["setuptools>=61.0", "wheel", "sls_build_backend"]
+build-backend = "sls_build_backend"
+
+[project]
+name = "sls_python"
+version = "0.0.2-alpha"
+description = "Python reimplementation of the SLS C project"
+authors = [ { name = "Kyler Olsen" } ]
+readme = "README.md"
+license = { text = "MIT" }
+requires-python = ">=3.10"
+dependencies = []
+
+[tool.setuptools]
+packages = ["sls_py"]
+
+[project.scripts]
+sls_py = "sls_py.__main__:main"

SLS_Python/sls_build_backend/__init__.py

@@ -0,0 +1,5 @@
+"""Build backend for sls_python package."""
+
+from .build_hooks import build_wheel, build_sdist
+
+__all__ = ["build_wheel", "build_sdist"]

SLS_Python/sls_build_backend/_version.py.in

@@ -0,0 +1,4 @@
+# Auto-generated during build
+version = "{version}"
+commit = "{commit}"
+timestamp = "{timestamp}"

SLS_Python/sls_build_backend/_version_dev.py.in

@@ -0,0 +1,23 @@
+import subprocess
+from datetime import datetime, timezone
+version = "{version}"
+try:
+    __result_hash = subprocess.check_output(
+        ["git", "describe", "--always", "--dirty", "--abbrev=7"],
+        cwd=".",
+        stderr=subprocess.DEVNULL,
+        text=True
+    ).strip()
+    __result_date = subprocess.check_output(
+        ["git", "show", "-s", "--format=%ci"],
+        cwd=".",
+        stderr=subprocess.DEVNULL,
+        text=True
+    ).strip()
+    commit = __result_hash + " " + __result_date
+except:
+    commit = "unknown"
+try:
+    timestamp = datetime.now(timezone.utc).isoformat() + "Z"
+except:
+    timestamp = "unknown"

SLS_Python/sls_build_backend/build_hooks.py

@@ -0,0 +1,17 @@
+from setuptools.build_meta import build_wheel as _build_wheel
+from setuptools.build_meta import build_sdist as _build_sdist
+from .write_version import generate_version, generate_version_dev
+
+
+def build_wheel(*args, **kwargs):
+    generate_version()
+    o = _build_wheel(*args, **kwargs)
+    generate_version_dev()
+    return o
+
+
+def build_sdist(*args, **kwargs):
+    generate_version()
+    o = _build_sdist(*args, **kwargs)
+    generate_version_dev()
+    return o

SLS_Python/sls_build_backend/pyproject.toml

@@ -0,0 +1,14 @@
+[build-system]
+requires = ["setuptools>=61.0", "wheel"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "sls-build-backend"
+version = "0.1.0"
+description = "Build backend for sls_python"
+authors = [{name = "Kyler Olsen"}]
+requires-python = ">=3.10"
+
+[tool.setuptools]
+packages = ["sls_build_backend"]
+package-dir = {"" = ".."}

SLS_Python/sls_build_backend/write_version.py

@@ -0,0 +1,91 @@
+
+import subprocess
+import datetime
+import pathlib
+
+try:
+    import tomllib  # Python 3.11+
+except Exception:  # pragma: no cover - older Pythons
+    tomllib = None
+
+root = pathlib.Path(__file__).resolve().parents[1]
+# templates live inside the backend package
+template = root / "sls_build_backend" / "_version.py.in"
+template_dev = root / "sls_build_backend" / "_version_dev.py.in"
+output = root / "sls_py" / "_version.py"
+
+
+def get_commit():
+    try:
+        result_hash = subprocess.check_output(
+            ["git", "describe", "--always", "--dirty", "--abbrev=7"],
+            cwd=str(root),
+            stderr=subprocess.DEVNULL,
+            text=True,
+        ).strip()
+        result_date = subprocess.check_output(
+            ["git", "show", "-s", "--format=%ci"],
+            cwd=str(root),
+            stderr=subprocess.DEVNULL,
+            text=True,
+        ).strip()
+        return f"{result_hash} {result_date}"
+    except Exception:
+        return "unknown"
+
+
+def get_timestamp():
+    return datetime.datetime.now(datetime.timezone.utc).isoformat() + "Z"
+
+
+def _get_version_from_pyproject(root_path: pathlib.Path):
+    py = root_path / "pyproject.toml"
+    if not py.exists() or tomllib is None:
+        return None
+    try:
+        data = tomllib.loads(py.read_text())
+    except Exception:
+        return None
+    # PEP 621
+    version = data.get("project", {}).get("version")
+    if version:
+        return version
+    # Some projects put metadata under tool.setuptools
+    version = data.get("tool", {}).get("setuptools", {}).get("version")
+    return version
+
+
+def _determine_version(root_path: pathlib.Path):
+    v = _get_version_from_pyproject(root_path)
+    if v:
+        return v
+    return "unknown"
+
+
+def generate_version_dev():
+    version = _determine_version(root)
+    if not template_dev.exists():
+        # write a minimal generated file if dev template missing
+        output.write_text(f"version = \"{version}\"\ncommit = \"unknown\"\ntimestamp = \"unknown\"\n")
+        return
+    text = template_dev.read_text()
+    text = text.format(version=version)
+    output.write_text(text)
+
+
+def generate_version():
+    version = _determine_version(root)
+
+    commit = get_commit()
+    timestamp = get_timestamp()
+
+    if not template.exists():
+        # fallback: write a minimal file
+        output.write_text(
+            f"version = \"{version}\"\ncommit = \"{commit}\"\ntimestamp = \"{timestamp}\"\n"
+        )
+        return
+
+    text = template.read_text()
+    text = text.format(version=version, commit=commit, timestamp=timestamp)
+    output.write_text(text)

SLS_Python/sls_py.pyi

@@ -0,0 +1,142 @@
+from dataclasses import dataclass, field
+from enum import Enum, auto
+from typing import Callable, Dict, List, Optional
+
+def main() -> int:
+    ...
+
+SLS_NAME: str
+SLS_VERSION: str
+SLS_COMMIT: str
+INTERPRETER_NAME: str
+INTERPRETER_VER: int
+MODULE_TIMESTAMP: str
+SLS_INFO_STRING_1: str
+SLS_INFO_STRING_2: str
+
+
+class LexerInfo:
+    filename: str
+    source_code: str
+    pos: int
+    column: int
+    line: int
+
+    def __init__(self, filename: str = "", source_code: str = ""): ...
+
+
+class TokenType(Enum):
+    EOF = auto()
+    IDENTIFIER = auto()
+    INTEGER = auto()
+    FLOAT = auto()
+    DOUBLE = auto()
+    CHARACTER = auto()
+    STRING = auto()
+    BOOLEAN = auto()
+    ARRAY = auto()
+    TOKEN_STRING = auto()
+    TYPE_TUPLE = auto()
+
+
+@dataclass
+class Identifier:
+    name: str
+    is_literal: bool
+
+
+class IntegerBuiltInType(Enum):
+    I64 = auto()
+    I32 = auto()
+    I16 = auto()
+    I8 = auto()
+    U64 = auto()
+    U32 = auto()
+    U16 = auto()
+    U8 = auto()
+
+
+@dataclass
+class IntegerLiteral:
+    value: int
+    type: IntegerBuiltInType
+
+
+@dataclass
+class TokenString:
+    tokens: List["Token"] = field(default_factory=list)
+
+    def deep_copy(self) -> TokenString: ...
+
+
+@dataclass
+class Token:
+    type: TokenType
+    identifier: Optional[Identifier] = None
+    integer_literal: Optional[IntegerLiteral] = None
+    float_literal: Optional[float] = None
+    double_literal: Optional[float] = None
+    character_literal: Optional[int] = None
+    string_literal: Optional[str] = None
+    boolean_literal: Optional[bool] = None
+    token_string: Optional[TokenString] = None
+
+
+def lexical_analysis(lexer_info: LexerInfo) -> List[Token]:
+    ...
+
+
+class StackType(Enum):
+    IDENTIFIER = auto()
+    I64 = auto()
+    I32 = auto()
+    I16 = auto()
+    I8 = auto()
+    U64 = auto()
+    U32 = auto()
+    U16 = auto()
+    U8 = auto()
+    FLOAT = auto()
+    DOUBLE = auto()
+    CHARACTER = auto()
+    BOOLEAN = auto()
+    TOKEN_STRING = auto()
+    CALLABLE = auto()
+
+@dataclass
+class StackEntry:
+    type: StackType
+    value: object
+
+
+class FunctionType(Enum):
+    TOKEN_STRING = auto()
+    BUILTIN = auto()
+
+
+@dataclass
+class FunctionItem:
+    type: FunctionType
+    token_string: Optional[TokenString] = None
+    builtin: Optional[Callable[["InterpreterState"], bool]] = None
+
+    @classmethod
+    def from_token_string(cls, ts: TokenString) -> "FunctionItem": ...
+    @classmethod
+    def from_builtin(cls, fn: Callable[["InterpreterState"], bool]) -> "FunctionItem": ...
+
+
+class InterpreterState:
+    stack: List[StackEntry]
+    functions: Dict[str, FunctionItem]
+
+    def __init__(self): ...
+    def push(self, entry: StackEntry) -> None: ...
+    def pop(self) -> Optional[StackEntry]: ...
+    def top(self) -> Optional[StackEntry]: ...
+    def add_function(self, name: str, item: FunctionItem) -> None: ...
+    def get_function(self, name: str) -> Optional[FunctionItem]: ...
+    def push_token(self, token: Token) -> bool: ...
+    def execute_func(self, key: str) -> bool: ...
+    def execute_token_string(self, token_string: TokenString) -> bool: ...
+    def execute(self, token: Token) -> bool: ...

SLS_Python/sls_py/__init__.py

@@ -0,0 +1,56 @@
+from .__main__ import main
+
+from .meta import (
+    SLS_NAME,
+    SLS_VERSION,
+    SLS_COMMIT,
+    INTERPRETER_NAME,
+    INTERPRETER_VER,
+    MODULE_TIMESTAMP,
+    SLS_INFO_STRING_1,
+    SLS_INFO_STRING_2,
+)
+
+from .lexer import (
+    LexerInfo,
+    TokenType,
+    Identifier,
+    IntegerBuiltInType,
+    IntegerLiteral,
+    TokenString,
+    Token,
+    lexical_analysis,
+)
+
+from .interpreter import (
+    StackType,
+    StackEntry,
+    FunctionType,
+    FunctionItem,
+    InterpreterState,
+)
+
+__all__ = [
+    "main",
+    "SLS_NAME",
+    "SLS_VERSION",
+    "SLS_COMMIT",
+    "INTERPRETER_NAME",
+    "INTERPRETER_VER",
+    "MODULE_TIMESTAMP",
+    "SLS_INFO_STRING_1",
+    "SLS_INFO_STRING_2",
+    "LexerInfo",
+    "TokenType",
+    "Identifier",
+    "IntegerBuiltInType",
+    "IntegerLiteral",
+    "TokenString",
+    "Token",
+    "lexical_analysis",
+    "StackType",
+    "StackEntry",
+    "FunctionType",
+    "FunctionItem",
+    "InterpreterState",
+]

SLS_Python/sls_py/__main__.py

@@ -0,0 +1,33 @@
+import sys
+from .meta import print_version
+from .repl import repl
+from .file import run_file
+
+
+def main() -> int:
+    args = sys.argv[1:]
+
+    version = False
+    filename = None
+
+    if len(args) == 1:
+        if args[0] in ("--version", "-v"):
+            version = True
+        else:
+            filename = args[0]
+    elif len(args) > 1:
+        print("Too many arguments!")
+        return 1
+
+    if version:
+        print_version()
+        return 0
+
+    if filename is not None:
+        return run_file(filename)
+
+    return repl()
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())

SLS_Python/sls_py/_version.py

@@ -0,0 +1,23 @@
+import subprocess
+from datetime import datetime, timezone
+version = "0.0.2-alpha"
+try:
+    __result_hash = subprocess.check_output(
+        ["git", "describe", "--always", "--dirty", "--abbrev=7"],
+        cwd=".",
+        stderr=subprocess.DEVNULL,
+        text=True
+    ).strip()
+    __result_date = subprocess.check_output(
+        ["git", "show", "-s", "--format=%ci"],
+        cwd=".",
+        stderr=subprocess.DEVNULL,
+        text=True
+    ).strip()
+    commit = __result_hash + " " + __result_date
+except:
+    commit = "unknown"
+try:
+    timestamp = datetime.now(timezone.utc).isoformat() + "Z"
+except:
+    timestamp = "unknown"

SLS_Python/sls_py/calc/__main__.py

@@ -0,0 +1,268 @@
+#!/usr/bin/env python3
+"""
+HP-Style RPN Calculator using Stack Language Backend
+Implements classic HP calculator interface with stack display
+"""
+
+import tkinter as tk
+from tkinter import ttk, font as tkfont
+from .. import (
+    InterpreterState,
+    LexerInfo,
+    lexical_analysis,
+    TokenType,
+    StackType,
+)
+
+class SlsCalculator:
+    def __init__(self, root):
+        self.root = root
+        self.root.title("SLS Calculator")
+        # self.root.geometry("450x650")
+        self.root.resizable(False, False)
+        
+        # Initialize interpreter
+        self.interp = InterpreterState()
+        self.lexer = LexerInfo()
+        
+        # Current entry buffer
+        self.entry_buffer = ""
+        self.is_new_entry = True
+        
+        # Set up UI
+        self.create_widgets()
+        
+    def create_widgets(self):
+        """Create all calculator widgets"""
+        # Main container
+        main_frame = ttk.Frame(self.root, padding="10")
+        main_frame.grid(row=0, column=0, sticky=(tk.W, tk.E, tk.N, tk.S)) # type: ignore
+        
+        self.create_stack_display(main_frame)
+        
+        # Entry display
+        self.create_entry_display(main_frame)
+        
+        # Button grid
+        self.create_button_grid(main_frame)
+        
+    def create_stack_display(self, parent):
+        """Create the 4-level stack display"""
+        stack_frame = ttk.LabelFrame(parent, text="Stack", padding="5")
+        stack_frame.grid(row=0, column=0, columnspan=4, sticky=(tk.W, tk.E), pady=(0, 10)) # type: ignore
+        
+        self.stack_labels = []
+        for i in range(4):
+            label = ttk.Label(stack_frame,
+                            text=f"{3-i}:",
+                            anchor='e',
+                            width=30)
+            label.grid(row=i, column=0, sticky=(tk.W, tk.E), pady=2) # type: ignore
+            self.stack_labels.append(label)
+            
+    def create_entry_display(self, parent):
+        """Create the current entry display"""
+        entry_frame = ttk.Frame(parent)
+        entry_frame.grid(row=1, column=0, columnspan=4, sticky=(tk.W, tk.E), pady=(0, 10)) # type: ignore
+        
+        self.entry_label = ttk.Label(entry_frame,
+                                    text="0",
+                                    anchor='e',
+                                    font=('Courier', 16))
+        self.entry_label.grid(row=0, column=0, sticky=(tk.W, tk.E)) # type: ignore
+        
+    def create_button_grid(self, parent):
+        """Create the calculator button grid"""
+        buttons = [
+            [('√', self.sqrt), ('x²', self.square), ('1/x', self.reciprocal), ('NULL', lambda: None)],
+            [('ENTER', lambda: self.enter(True)), ('SWAP', self.swap), ('<-', self.drop), ('NULL', lambda: None)],
+            [('7', lambda: self.digit('7')), ('8', lambda: self.digit('8')), ('9', lambda: self.digit('9')), ('÷', self.divide)],
+            [('4', lambda: self.digit('4')), ('5', lambda: self.digit('5')), ('6', lambda: self.digit('6')), ('×', self.multiply)],
+            [('1', lambda: self.digit('1')), ('2', lambda: self.digit('2')), ('3', lambda: self.digit('3')), ('−', self.subtract)],
+            [('0', lambda: self.digit('0')), ('.', self.decimal), ('±', self.negate), ('+', self.add)],
+        ]
+        
+        for row_idx, row in enumerate(buttons, start=2):
+            for col_idx, (text, command) in enumerate(row):
+                if text != "NULL":
+                    btn = ttk.Button(parent,
+                                    text=text,
+                                    command=command,
+                                    width=8)
+                    btn.grid(row=row_idx, column=col_idx, padx=2, pady=2, sticky=(tk.W, tk.E, tk.N, tk.S)) # type: ignore
+        
+        # Keyboard bindings
+        self.root.bind('<Delete>', lambda e: self.drop())
+        self.root.bind('<Return>', lambda e: self.enter(True))
+        self.root.bind('<KP_Enter>', lambda e: self.enter(True))
+        for i in range(10):
+            self.root.bind(str(i), lambda e, n=str(i): self.digit(n))
+        self.root.bind('.', lambda e: self.decimal())
+        self.root.bind('+', lambda e: self.add())
+        self.root.bind('-', lambda e: self.subtract())
+        self.root.bind('*', lambda e: self.multiply())
+        self.root.bind('/', lambda e: self.divide())
+        
+    def digit(self, d):
+        """Handle digit button press"""
+        if self.is_new_entry:
+            self.entry_buffer = d
+            self.is_new_entry = False
+        else:
+            self.entry_buffer += d
+        self.update_entry_display()
+        
+    def decimal(self):
+        """Handle decimal point"""
+        if self.is_new_entry:
+            self.entry_buffer = "0."
+            self.is_new_entry = False
+        elif '.' not in self.entry_buffer:
+            self.entry_buffer += '.'
+        self.update_entry_display()
+        
+    def negate(self):
+        """Toggle sign of current entry"""
+        if self.is_new_entry:
+            # Negate top of stack
+            self.execute_code("0 swap -")
+        else:
+            if self.entry_buffer.startswith('-'):
+                self.entry_buffer = self.entry_buffer[1:]
+            else:
+                self.entry_buffer = '-' + self.entry_buffer
+        self.update_entry_display()
+        
+    def enter(self, key=False):
+        """Push current entry onto stack"""
+        if self.entry_buffer:
+            self.execute_code(self.entry_buffer)
+            self.entry_buffer = ""
+            self.is_new_entry = True
+        elif key:
+            self.execute_code("dup")
+        self.update_displays()
+        
+    def add(self):
+        """Addition operation"""
+        self.enter()
+        self.execute_code("+")
+        self.update_displays()
+        
+    def subtract(self):
+        """Subtraction operation"""
+        self.enter()
+        self.execute_code("-")
+        self.update_displays()
+        
+    def multiply(self):
+        """Multiplication operation"""
+        self.enter()
+        self.execute_code("*")
+        self.update_displays()
+        
+    def divide(self):
+        """Division operation"""
+        self.enter()
+        self.execute_code("/")
+        self.update_displays()
+        
+    def sqrt(self):
+        """Square root operation"""
+        self.enter()
+        self.execute_code("sqrt")
+        self.update_displays()
+        
+    def square(self):
+        """Square operation"""
+        self.enter()
+        self.execute_code("dup *")
+        self.update_displays()
+        
+    def reciprocal(self):
+        """Reciprocal (1/x) operation"""
+        self.enter()
+        self.execute_code("1 swap /")
+        self.update_displays()
+        
+    def swap(self):
+        """Swap top two stack items"""
+        self.enter()
+        self.execute_code("swap")
+        self.update_displays()
+        
+    def drop(self):
+        """Drop top stack item"""
+        self.enter()
+        self.execute_code("drop")
+        self.update_displays()
+        
+    def execute_code(self, code):
+        """Execute stack language code"""
+        try:
+            self.lexer.source_code = code
+            self.lexer.pos = 0
+            self.lexer.column = 1
+            self.lexer.line = 1
+            
+            tokens = lexical_analysis(self.lexer)
+            
+            for token in tokens:
+                if token.type == TokenType.EOF:
+                    break
+                if not self.interp.execute(token):
+                    print(f"Error executing: {code}")
+                    break
+        except Exception as e:
+            print(f"Exception: {e}")
+            
+    def update_entry_display(self):
+        """Update the entry display"""
+        display_text = self.entry_buffer if self.entry_buffer else "0"
+        self.entry_label.config(text=display_text)
+        
+    def update_displays(self):
+        """Update both entry and stack displays"""
+        self.update_entry_display()
+        self.update_stack_display()
+        
+    def update_stack_display(self):
+        """Update the 4-level stack display"""
+        stack_size = len(self.interp.stack)
+        
+        for i in range(4):
+            level = 3 - i  # T3, T2, T1, T0
+            if stack_size > level:
+                entry = self.interp.stack[-(level + 1)]
+                value_str = self.format_stack_entry(entry)
+                self.stack_labels[i].config(text=f"{level}: {value_str}")
+            else:
+                self.stack_labels[i].config(text=f"{level}:")
+                
+    def format_stack_entry(self, entry):
+        """Format a stack entry for display"""
+        if entry.type == StackType.I64:
+            return str(entry.value)
+        elif entry.type == StackType.DOUBLE:
+            val = entry.value
+            # Format with appropriate precision
+            if abs(val) < 1e-10 and val != 0:
+                return f"{val:.6e}"
+            elif abs(val) > 1e10:
+                return f"{val:.6e}"
+            else:
+                return f"{val:.10g}"
+        elif entry.type == StackType.BOOLEAN:
+            return str(entry.value)
+        else:
+            return str(entry.value)
+
+
+def main():
+    root = tk.Tk()
+    app = SlsCalculator(root)
+    root.mainloop()
+
+
+if __name__ == "__main__":
+    main()

SLS_Python/sls_py/file.py

@@ -0,0 +1,37 @@
+from pathlib import Path
+from .lexer import LexerInfo, lexical_analysis, Token
+from .interpreter import InterpreterState
+
+
+def exec_file(interpreter_state: InterpreterState, filename: str) -> bool:
+    path = Path(filename)
+
+    if not path.exists():
+        print(f"Cannot read file: {filename}")
+        return False
+
+    try:
+        code = path.read_text()
+    except Exception:
+        print(f"Cannot read file: {filename}")
+        return False
+
+    lexer_info = LexerInfo(filename=filename, source_code=code)
+
+    tokens: list[Token] = lexical_analysis(lexer_info)
+
+    for tok in tokens:
+        if not interpreter_state.execute(tok):
+            print("A runtime error occurred!")
+            return False
+
+    return True
+
+def run_file(filename: str) -> int:
+    print(f"Executing file: {filename}")
+
+    interpreter_state = InterpreterState()
+
+    success = exec_file(interpreter_state, filename)
+
+    return 0 if success else 1

SLS_Python/sls_py/interpreter.py

@@ -0,0 +1,230 @@
+from __future__ import annotations
+from dataclasses import dataclass
+from enum import Enum, auto
+from typing import Callable, Dict, List, Optional
+
+from .lexer import (
+    Token,
+    TokenType,
+    TokenString,
+    IntegerLiteral,
+    IntegerBuiltInType,
+)
+
+from .interpreter_types import StackType
+from .builtin import load_builtins
+
+
+@dataclass
+class StackEntry:
+    type: StackType
+    value: object  # Identifier | int | float | bool | TokenString | FunctionItem etc.
+
+
+class FunctionType(Enum):
+    TOKEN_STRING = auto()
+    BUILTIN = auto()
+
+type FunctionData = TokenString | Callable[["InterpreterState"], bool]
+
+@dataclass
+class FunctionItem:
+    type: FunctionType
+    token_string: Optional[TokenString] = None
+    builtin: Optional[Callable[["InterpreterState"], bool]] = None
+
+    @classmethod
+    def from_item(cls, item: FunctionData) -> "FunctionItem":
+        if isinstance(item, TokenString):
+            return cls.from_token_string(item)
+        else:
+            return cls.from_builtin(item)
+
+    @classmethod
+    def from_token_string(cls, ts: TokenString) -> "FunctionItem":
+        return cls(type=FunctionType.TOKEN_STRING, token_string=ts)
+
+    @classmethod
+    def from_builtin(cls, fn: Callable[["InterpreterState"], bool]) -> "FunctionItem":
+        return cls(type=FunctionType.BUILTIN, builtin=fn)
+
+
+class InterpreterState:
+    """
+    Interpreter state holds:
+        - stack: list of StackEntry (top of stack is stack[-1])
+        - functions: dict mapping names to FunctionItem
+    """
+
+    def __init__(self):
+        self.stack: List[StackEntry] = []
+        self.functions: Dict[str, FunctionItem] = {}
+
+        if load_builtins is not None:
+            ok = load_builtins(self)
+            if not ok:
+                raise RuntimeError("Failed to load builtins")
+
+    # -------------------------
+    # stack helpers
+    # -------------------------
+    def push(self, entry: StackEntry) -> None:
+        self.stack.append(entry)
+
+    def pop(self) -> Optional[StackEntry]:
+        if not self.stack:
+            return None
+        return self.stack.pop()
+
+    def top(self) -> Optional[StackEntry]:
+        if not self.stack:
+            return None
+        return self.stack[-1]
+
+    # -------------------------
+    # function table
+    # -------------------------
+    def add_function(self, name: str, item: FunctionData) -> None:
+        self.functions[name] = FunctionItem.from_item(item)
+
+    def get_function(self, name: str) -> Optional[FunctionItem]:
+        return self.functions.get(name)
+
+    # -------------------------
+    # execution primitives
+    # -------------------------
+    def push_token(self, token: Token) -> bool:
+        """
+        Push a token onto the stack. Returns True on success, False on failure.
+        Mirrors the logic from the C implementation:
+            - disallow TOKEN_STRING, TOKEN_ARRAY, TOKEN_TYPE_TUPLE
+            - return True for TOKEN_EOF (no-op)
+        """
+        ttype = token.type
+
+        if ttype == TokenType.EOF:
+            return True
+
+        # map token -> stack type + extract value
+        if ttype == TokenType.IDENTIFIER:
+            entry = StackEntry(StackType.IDENTIFIER, token.identifier)
+            self.push(entry)
+            return True
+
+        if ttype == TokenType.INTEGER:
+            ilit: IntegerLiteral = token.integer_literal  # type: ignore
+            itype = ilit.type
+            # choose stack type explicitly to mirror C widths
+            if itype == IntegerBuiltInType.I64:
+                st = StackType.I64
+                val = int(ilit.value)
+            elif itype == IntegerBuiltInType.I32:
+                st = StackType.I32
+                val = int(ilit.value) & 0xFFFFFFFF  # mimic truncation if desired
+            elif itype == IntegerBuiltInType.I16:
+                st = StackType.I16
+                val = int(ilit.value) & 0xFFFF
+            elif itype == IntegerBuiltInType.I8:
+                st = StackType.I8
+                val = int(ilit.value) & 0xFF
+            elif itype == IntegerBuiltInType.U64:
+                st = StackType.U64
+                val = int(ilit.value)
+            elif itype == IntegerBuiltInType.U32:
+                st = StackType.U32
+                val = int(ilit.value) & 0xFFFFFFFF
+            elif itype == IntegerBuiltInType.U16:
+                st = StackType.U16
+                val = int(ilit.value) & 0xFFFF
+            elif itype == IntegerBuiltInType.U8:
+                st = StackType.U8
+                val = int(ilit.value) & 0xFF
+            else:
+                return False
+
+            self.push(StackEntry(st, val))
+            return True
+
+        if ttype == TokenType.FLOAT:
+            self.push(StackEntry(StackType.FLOAT, token.float_literal))
+            return True
+
+        if ttype == TokenType.DOUBLE:
+            self.push(StackEntry(StackType.DOUBLE, token.double_literal))
+            return True
+
+        if ttype == TokenType.CHARACTER:
+            self.push(StackEntry(StackType.CHARACTER, token.character_literal))
+            return True
+
+        if ttype == TokenType.STRING:
+            # C returned FALSE for TOKEN_STRING
+            return False
+
+        if ttype == TokenType.BOOLEAN:
+            self.push(StackEntry(StackType.BOOLEAN, token.boolean_literal))
+            return True
+
+        if ttype == TokenType.ARRAY:
+            # C returned FALSE for arrays
+            return False
+
+        if ttype == TokenType.TOKEN_STRING:
+            # copy token string to mimic C copy semantics
+            ts_copy = token.token_string.deep_copy()  # type: ignore
+            self.push(StackEntry(StackType.TOKEN_STRING, ts_copy))
+            return True
+
+        if ttype == TokenType.TYPE_TUPLE:
+            # C returned FALSE for type tuples
+            return False
+
+        # unknown token type
+        return False
+
+    def execute_func(self, key: str) -> bool:
+        """
+        Look up a function by name and execute it.
+        Builtin functions are callables that accept InterpreterState and return bool.
+        Token-string functions are executed via execute_token_string.
+        """
+        func = self.get_function(key)
+        if func is None:
+            return False
+
+        if func.type == FunctionType.BUILTIN:
+            if func.builtin is None:
+                return False
+            return func.builtin(self)
+
+        if func.type == FunctionType.TOKEN_STRING:
+            if func.token_string is None:
+                return False
+            return self.execute_token_string(func.token_string)
+
+        return False
+
+    def execute_token_string(self, token_string: TokenString) -> bool:
+        """
+        Execute each token in a TokenString.
+        If token is an identifier and not `is_literal`, treat it as a function call.
+        Otherwise push token onto the stack.
+        """
+        for tok in token_string.tokens:
+            if tok.type == TokenType.IDENTIFIER and tok.identifier is not None and not tok.identifier.is_literal:
+                rv = self.execute_func(tok.identifier.name)
+            else:
+                rv = self.push_token(tok)
+            if not rv:
+                return False
+        return True
+
+    def execute(self, token: Token) -> bool:
+        """
+        Execute a single Token (this corresponds to processing a single lexer result).
+        If the token is an un-literal identifier -> function call, otherwise push it.
+        """
+        if token.type == TokenType.IDENTIFIER and token.identifier is not None and not token.identifier.is_literal:
+            return self.execute_func(token.identifier.name)
+        else:
+            return self.push_token(token)

SLS_Python/sls_py/interpreter_types.py

@@ -0,0 +1,18 @@
+from enum import Enum, auto
+
+class StackType(Enum):
+    IDENTIFIER = auto()
+    I64 = auto()
+    I32 = auto()
+    I16 = auto()
+    I8 = auto()
+    U64 = auto()
+    U32 = auto()
+    U16 = auto()
+    U8 = auto()
+    FLOAT = auto()
+    DOUBLE = auto()
+    CHARACTER = auto()
+    BOOLEAN = auto()
+    TOKEN_STRING = auto()
+    CALLABLE = auto()

SLS_Python/sls_py/lexer.py

@@ -0,0 +1,904 @@
+from __future__ import annotations
+from dataclasses import dataclass, field
+from enum import Enum, auto
+from typing import List, Optional, Any, Union
+
+
+# =====================================================================
+#  Basic Types
+# =====================================================================
+
+class LexerInfo:
+    filename: str
+    source_code: str
+    pos: int
+    column: int
+    line: int
+
+    def __init__(self, filename: str = "", source_code: str = ""):
+        self.filename = filename
+        self.source_code = source_code
+        self.pos = 0
+        self.column = 1
+        self.line = 1
+
+
+# =====================================================================
+#  Token Types
+# =====================================================================
+
+class TokenType(Enum):
+    EOF = auto()
+    IDENTIFIER = auto()
+    INTEGER = auto()
+    FLOAT = auto()
+    DOUBLE = auto()
+    CHARACTER = auto()
+    STRING = auto()
+    BOOLEAN = auto()
+    ARRAY = auto()
+    TOKEN_STRING = auto()
+    TYPE_TUPLE = auto()
+
+
+# =====================================================================
+#  Array Literal Types
+# =====================================================================
+
+class ArrayType(Enum):
+    IDENTIFIER = auto()
+    I64 = auto()
+    I32 = auto()
+    I16 = auto()
+    I8 = auto()
+    U64 = auto()
+    U32 = auto()
+    U16 = auto()
+    U8 = auto()
+    FLOAT = auto()
+    DOUBLE = auto()
+    CHARACTER = auto()
+    STRING = auto()
+    BOOLEAN = auto()
+    STRUCT_INLINE = auto()
+
+
+# =====================================================================
+#  Identifier
+# =====================================================================
+
+@dataclass
+class Identifier:
+    name: str
+    is_literal: bool
+
+
+# =====================================================================
+#  Integer Literal Type
+# =====================================================================
+
+class IntegerBuiltInType(Enum):
+    I64 = auto()
+    I32 = auto()
+    I16 = auto()
+    I8 = auto()
+    U64 = auto()
+    U32 = auto()
+    U16 = auto()
+    U8 = auto()
+
+
+@dataclass
+class IntegerLiteral:
+    value: int
+    type: IntegerBuiltInType
+
+
+# =====================================================================
+#  TokenString, TypeTuple, StructInline
+# =====================================================================
+
+@dataclass
+class TokenString:
+    tokens: List["Token"] = field(default_factory=list)
+
+    def deep_copy(self) -> TokenString:
+        copied_tokens = [Token(
+            type=token.type,
+            identifier=token.identifier,
+            integer_literal=token.integer_literal,
+            float_literal=token.float_literal,
+            double_literal=token.double_literal,
+            character_literal=token.character_literal,
+            string_literal=token.string_literal,
+            boolean_literal=token.boolean_literal,
+            array_literal=token.array_literal.deep_copy() if token.array_literal else None,
+            token_string=token.token_string.deep_copy() if token.token_string else None,
+            type_tuple=token.type_tuple.deep_copy() if token.type_tuple else None
+        ) for token in self.tokens]
+        return TokenString(tokens=copied_tokens)
+
+
+@dataclass
+class TypeTuple:
+    input_identifiers: List[Identifier] = field(default_factory=list)
+    output_identifiers: List[Identifier] = field(default_factory=list)
+
+    def deep_copy(self) -> TypeTuple:
+        copied_input_ids = [Identifier(name=id.name, is_literal=id.is_literal) for id in self.input_identifiers]
+        copied_output_ids = [Identifier(name=id.name, is_literal=id.is_literal) for id in self.output_identifiers]
+        return TypeTuple(input_identifiers=copied_input_ids, output_identifiers=copied_output_ids)
+
+
+@dataclass
+class StructInline:
+    values: List[Any]
+    name: str
+
+
+# =====================================================================
+#  ArrayLiteral
+# =====================================================================
+
+@dataclass
+class ArrayLiteral:
+    type: ArrayType
+
+    identifiers: Optional[List[Identifier]] = None
+    integer_literals: Optional[List[int]] = None
+    float_literals: Optional[List[float]] = None
+    double_literals: Optional[List[float]] = None
+    character_literals: Optional[List[int]] = None
+    string_literals: Optional[List[str]] = None
+    boolean_literals: Optional[List[bool]] = None
+    token_strings: Optional[List[TokenString]] = None
+    type_tuples: Optional[List[TypeTuple]] = None
+    struct_inline: Optional[StructInline] = None
+
+    shape: Optional[List[int]] = None
+    dimensions: int = 0
+
+    def deep_copy(self) -> ArrayLiteral:
+        copied_array = ArrayLiteral(type=self.type, dimensions=self.dimensions, shape=list(self.shape) if self.shape else None)
+
+        if self.identifiers is not None:
+            copied_array.identifiers = [Identifier(name=id.name, is_literal=id.is_literal) for id in self.identifiers]
+        if self.integer_literals is not None:
+            copied_array.integer_literals = list(self.integer_literals)
+        if self.float_literals is not None:
+            copied_array.float_literals = list(self.float_literals)
+        if self.double_literals is not None:
+            copied_array.double_literals = list(self.double_literals)
+        if self.character_literals is not None:
+            copied_array.character_literals = list(self.character_literals)
+        if self.string_literals is not None:
+            copied_array.string_literals = list(self.string_literals)
+        if self.boolean_literals is not None:
+            copied_array.boolean_literals = list(self.boolean_literals)
+        if self.token_strings is not None:
+            copied_array.token_strings = [ts.deep_copy() for ts in self.token_strings]
+        if self.type_tuples is not None:
+            copied_array.type_tuples = [tt.deep_copy() for tt in self.type_tuples]
+        if self.struct_inline is not None:
+            copied_array.struct_inline = StructInline(
+                values=list(self.struct_inline.values),
+                name=self.struct_inline.name
+            )
+
+        return copied_array
+
+
+# =====================================================================
+#  Token
+# =====================================================================
+
+@dataclass
+class Token:
+    type: TokenType
+
+    identifier: Optional[Identifier] = None
+    integer_literal: Optional[IntegerLiteral] = None
+    float_literal: Optional[float] = None
+    double_literal: Optional[float] = None
+    character_literal: Optional[int] = None
+    string_literal: Optional[str] = None
+    boolean_literal: Optional[bool] = None
+    array_literal: Optional[ArrayLiteral] = None
+    token_string: Optional[TokenString] = None
+    type_tuple: Optional[TypeTuple] = None
+
+
+# =====================================================================
+#  File Info and Results
+# =====================================================================
+
+@dataclass
+class FileInfo:
+    filename: str
+    line: int
+    column: int
+    length: int = 0
+    lines: int = 0
+
+
+@dataclass
+class LexerError(Exception):
+    message: str
+    file_info: FileInfo
+
+
+# =====================================================================
+#  Numeric Type Flags
+# =====================================================================
+
+class NumericType(Enum):
+    F64 = auto()
+    F32 = auto()
+    I64 = auto()
+    I32 = auto()
+    I16 = auto()
+    I8 = auto()
+    U64 = auto()
+    U32 = auto()
+    U16 = auto()
+    U8 = auto()
+
+
+class NumericLiteralType(Enum):
+    BINARY = auto()
+    OCTAL = auto()
+    DECIMAL = auto()
+    HEXADECIMAL = auto()
+    FLOAT = auto()
+    EXPONENTIAL = auto()
+
+
+# =====================================================================
+#  Lexer Implementation
+# =====================================================================
+
+class Lexer:
+    def __init__(self, info: LexerInfo):
+        self.info = info
+
+    def peek(self) -> str:
+        if self.info.pos >= len(self.info.source_code):
+            return '\0'
+        return self.info.source_code[self.info.pos]
+
+    def far_peek(self, offset: int) -> str:
+        pos = self.info.pos + offset
+        if pos >= len(self.info.source_code):
+            return '\0'
+        return self.info.source_code[pos]
+
+    def seek(self, index: int) -> str:
+        if index >= len(self.info.source_code):
+            return '\0'
+        return self.info.source_code[index]
+
+    def advance(self) -> str:
+        if self.info.pos < len(self.info.source_code):
+            if self.info.source_code[self.info.pos] == '\n':
+                self.info.line += 1
+                self.info.column = 1
+            else:
+                self.info.column += 1
+            self.info.pos += 1
+        return self.peek()
+
+    def get_file_info(self, start: int, start_line: int) -> FileInfo:
+        return FileInfo(
+            filename=self.info.filename,
+            line=self.info.line,
+            column=self.info.column,
+            length=self.info.pos - start,
+            lines=self.info.line - start_line
+        )
+
+    def get_token_text(self, start: int) -> str:
+        return self.info.source_code[start:self.info.pos]
+
+    def skip_comments_and_whitespace(self):
+        while True:
+            c = self.peek()
+            
+            # Skip comments
+            if (c == '/' and self.far_peek(1) == '/') or c == '#':
+                while self.peek() not in ('\n', '\0'):
+                    c = self.advance()
+            
+            # Skip whitespace
+            if c.isspace():
+                self.advance()
+                continue
+            
+            break
+
+    def is_identifier_continue(self, c: str) -> bool:
+        if not c.isprintable():
+            return False
+        if c == '/' and self.far_peek(1) == '/':
+            return False
+        if c in '{}[]()\'\"#':
+            return False
+        if c.isspace() or c == '\0':
+            return False
+        return True
+
+    def is_identifier_start(self) -> bool:
+        c = self.peek()
+        if c == ':' and self.far_peek(1) == ':':
+            c = self.far_peek(2)
+        return not c.isdigit() and self.is_identifier_continue(c)
+
+    # =====================================================================
+    #  Integer Parsing Helpers
+    # =====================================================================
+
+    def create_binary_integer(self, start: int) -> int:
+        token = self.get_token_text(start)
+        negative = token[0] == '-'
+        i = 3 if negative else 2
+        
+        value = 0
+        while i < len(token):
+            c = token[i]
+            if c.isspace() or c in '/:' or c == '\0':
+                break
+            if c in '._':
+                i += 1
+                continue
+            value *= 2
+            if c == '1':
+                value += 1
+            i += 1
+        
+        if negative:
+            # Python handles negative integers naturally
+            value = -value
+        return value
+
+    def create_octal_integer(self, start: int) -> int:
+        token = self.get_token_text(start)
+        negative = token[0] == '-'
+        i = 3 if negative else 2
+        
+        value = 0
+        while i < len(token):
+            c = token[i]
+            if c.isspace() or c in '/:' or c == '\0':
+                break
+            if c in '._':
+                i += 1
+                continue
+            value *= 8
+            if c.isdigit() and c < '8':
+                value += int(c)
+            i += 1
+        
+        if negative:
+            value = -value
+        return value
+
+    def create_decimal_integer(self, start: int) -> int:
+        token = self.get_token_text(start)
+        negative = token[0] == '-'
+        i = 1 if negative else 0
+        
+        value = 0
+        while i < len(token):
+            c = token[i]
+            if c.isspace() or c in '/:' or c == '\0':
+                break
+            if c == '_':
+                i += 1
+                continue
+            if c.isdigit():
+                value *= 10
+                value += int(c)
+            i += 1
+        
+        if negative:
+            value = -value
+        return value
+
+    def create_hexadecimal_integer(self, start: int) -> int:
+        token = self.get_token_text(start)
+        negative = token[0] == '-'
+        i = 3 if negative else 2
+        
+        value = 0
+        while i < len(token):
+            c = token[i]
+            if c.isspace() or c in '/:' or c == '\0':
+                break
+            if c in '._':
+                i += 1
+                continue
+            value *= 16
+            if c.isdigit():
+                value += int(c)
+            elif c.upper() in 'ABCDEF':
+                value += ord(c.upper()) - ord('A') + 10
+            i += 1
+        
+        if negative:
+            value = -value
+        return value
+
+    def create_float(self, start: int) -> float:
+        token = self.get_token_text(start)
+        negative = token[0] == '-'
+        i = 1 if negative else 0
+        
+        value = 0.0
+        fractional = 0
+        
+        while i < len(token):
+            c = token[i]
+            if c.isspace() or c in '/:' or c == '\0':
+                break
+            if c == '_':
+                i += 1
+                continue
+            if c == '.':
+                fractional = 1
+                i += 1
+                continue
+            
+            if fractional == 0:
+                value *= 10
+            else:
+                fractional *= 10
+            
+            if c.isdigit():
+                digit = int(c)
+                if fractional == 0:
+                    value += digit
+                else:
+                    value += digit / fractional
+            i += 1
+        
+        if negative:
+            value = -value
+        return value
+
+    # =====================================================================
+    #  Integer Type Validation
+    # =====================================================================
+
+    def get_integer_type(self, numeric_type: NumericType) -> IntegerBuiltInType:
+        type_map = {
+            NumericType.I64: IntegerBuiltInType.I64,
+            NumericType.I32: IntegerBuiltInType.I32,
+            NumericType.I16: IntegerBuiltInType.I16,
+            NumericType.I8: IntegerBuiltInType.I8,
+            NumericType.U64: IntegerBuiltInType.U64,
+            NumericType.U32: IntegerBuiltInType.U32,
+            NumericType.U16: IntegerBuiltInType.U16,
+            NumericType.U8: IntegerBuiltInType.U8,
+        }
+        
+        if numeric_type not in type_map:
+            raise ValueError("Encountered a Float where there should not be one.")
+        
+        return type_map[numeric_type]
+
+    def validate_integer_range(self, value: int, int_type: IntegerBuiltInType, start: int, start_line: int):
+        ranges = {
+            IntegerBuiltInType.I64: (-2**63, 2**63 - 1),
+            IntegerBuiltInType.I32: (-2**31, 2**31 - 1),
+            IntegerBuiltInType.I16: (-2**15, 2**15 - 1),
+            IntegerBuiltInType.I8: (-2**7, 2**7 - 1),
+            IntegerBuiltInType.U64: (0, 2**64 - 1),
+            IntegerBuiltInType.U32: (0, 2**32 - 1),
+            IntegerBuiltInType.U16: (0, 2**16 - 1),
+            IntegerBuiltInType.U8: (0, 2**8 - 1),
+        }
+        
+        min_val, max_val = ranges[int_type]
+        if value < min_val or value > max_val:
+            type_name = int_type.name.lower()
+            raise LexerError(
+                f"Integer overflow: value exceeds range for {type_name}.",
+                self.get_file_info(start, start_line)
+            )
+
+    def create_integer_token(self, int_type: IntegerBuiltInType, value: int, start: int, start_line: int) -> Token:
+        self.validate_integer_range(value, int_type, start, start_line)
+        return Token(
+            type=TokenType.INTEGER,
+            integer_literal=IntegerLiteral(value=value, type=int_type)
+        )
+
+    def create_float_token(self, numeric_type: NumericType, start: int, start_line: int) -> Token:
+        value = self.create_float(start)
+        if numeric_type == NumericType.F64:
+            return Token(type=TokenType.DOUBLE, double_literal=value)
+        else:
+            return Token(type=TokenType.FLOAT, float_literal=value)
+
+    # =====================================================================
+    #  Numeric Type Parsing
+    # =====================================================================
+
+    def parse_numeric_type(self, start: int, start_line: int, literal_type: NumericLiteralType) -> NumericType:
+        c = self.advance()
+        
+        if c == 'f':
+            if literal_type not in (NumericLiteralType.DECIMAL, NumericLiteralType.FLOAT, NumericLiteralType.EXPONENTIAL):
+                raise LexerError("Invalid numeric literal: float type not allowed.", self.get_file_info(start, start_line))
+            
+            c = self.advance()
+            if c == '6' and self.far_peek(1) == '4':
+                self.advance()
+                self.advance()
+                return NumericType.F64
+            elif c == '3' and self.far_peek(1) == '2':
+                self.advance()
+                self.advance()
+                return NumericType.F32
+            else:
+                raise LexerError("Invalid float type: must be of type 'f64' or 'f32'.", self.get_file_info(start, start_line))
+        
+        elif c in 'iu':
+            if literal_type in (NumericLiteralType.FLOAT, NumericLiteralType.EXPONENTIAL):
+                raise LexerError("Invalid float type: must be of type 'f64' or 'f32'.", self.get_file_info(start, start_line))
+            
+            unsigned = c == 'u'
+            c = self.advance()
+            
+            if c == '6' and self.far_peek(1) == '4':
+                self.advance()
+                self.advance()
+                return NumericType.U64 if unsigned else NumericType.I64
+            elif c == '3' and self.far_peek(1) == '2':
+                self.advance()
+                self.advance()
+                return NumericType.U32 if unsigned else NumericType.I32
+            elif c == '1' and self.far_peek(1) == '6':
+                self.advance()
+                self.advance()
+                return NumericType.U16 if unsigned else NumericType.I16
+            elif c == '8':
+                self.advance()
+                return NumericType.U8 if unsigned else NumericType.I8
+            else:
+                prefix = 'unsigned' if unsigned else 'signed'
+                raise LexerError(f"Invalid {prefix} integer type.", self.get_file_info(start, start_line))
+        
+        else:
+            raise LexerError("Invalid numeric type: type must start with 'f', 'i', or 'u'.", self.get_file_info(start, start_line))
+
+    # =====================================================================
+    #  Numeric Literal Parsing
+    # =====================================================================
+
+    def parse_binary_integer(self, start: int, start_line: int) -> Token:
+        c = self.peek()
+        while c in '01_':
+            c = self.advance()
+        
+        if c == ':':
+            numeric_type = self.parse_numeric_type(start, start_line, NumericLiteralType.BINARY)
+            int_type = self.get_integer_type(numeric_type)
+            value = self.create_binary_integer(start)
+            return self.create_integer_token(int_type, value, start, start_line)
+        
+        if c.isspace() or c in '/\0':
+            value = self.create_binary_integer(start)
+            return self.create_integer_token(IntegerBuiltInType.I64, value, start, start_line)
+        
+        raise LexerError(f"Invalid binary literal: unexpected '{c}' in binary integer.", self.get_file_info(start, start_line))
+
+    def parse_octal_integer(self, start: int, start_line: int) -> Token:
+        c = self.peek()
+        while c.isdigit() and c not in '89' or c == '_':
+            c = self.advance()
+        
+        if c == ':':
+            numeric_type = self.parse_numeric_type(start, start_line, NumericLiteralType.OCTAL)
+            int_type = self.get_integer_type(numeric_type)
+            value = self.create_octal_integer(start)
+            return self.create_integer_token(int_type, value, start, start_line)
+        
+        if c.isspace() or c in '/\0':
+            value = self.create_octal_integer(start)
+            return self.create_integer_token(IntegerBuiltInType.I64, value, start, start_line)
+        
+        raise LexerError(f"Invalid octal literal: unexpected '{c}' in octal integer.", self.get_file_info(start, start_line))
+
+    def parse_hexadecimal_integer(self, start: int, start_line: int) -> Token:
+        c = self.peek()
+        while c in '0123456789ABCDEFabcdef_':
+            c = self.advance()
+        
+        if c == ':':
+            numeric_type = self.parse_numeric_type(start, start_line, NumericLiteralType.HEXADECIMAL)
+            int_type = self.get_integer_type(numeric_type)
+            value = self.create_hexadecimal_integer(start)
+            return self.create_integer_token(int_type, value, start, start_line)
+        
+        if c.isspace() or c in '/\0':
+            value = self.create_hexadecimal_integer(start)
+            return self.create_integer_token(IntegerBuiltInType.I64, value, start, start_line)
+        
+        raise LexerError(f"Invalid hexadecimal literal: unexpected '{c}' in hexadecimal integer.", self.get_file_info(start, start_line))
+
+    def parse_exponential(self, start: int, start_line: int) -> Token:
+        raise NotImplementedError("Float exponential not implemented yet.")
+
+    def parse_float(self, start: int, start_line: int) -> Token:
+        c = self.peek()
+        while c.isdigit() or c == '_':
+            c = self.advance()
+        
+        if c in 'eE':
+            return self.parse_exponential(start, start_line)
+        
+        if c == ':':
+            numeric_type = self.parse_numeric_type(start, start_line, NumericLiteralType.FLOAT)
+            return self.create_float_token(numeric_type, start, start_line)
+        
+        if c.isspace() or c in '/\0':
+            return self.create_float_token(NumericType.F64, start, start_line)
+        
+        raise LexerError(f"Invalid float literal: unexpected '{c}' in float.", self.get_file_info(start, start_line))
+
+    def parse_decimal_integer(self, start: int, start_line: int) -> Token:
+        c = self.peek()
+        while c.isdigit() or c == '_':
+            c = self.advance()
+        
+        if c == '.':
+            self.advance()
+            return self.parse_float(start, start_line)
+        
+        if c in 'eE':
+            return self.parse_exponential(start, start_line)
+        
+        if c == ':':
+            numeric_type = self.parse_numeric_type(start, start_line, NumericLiteralType.DECIMAL)
+            int_type = self.get_integer_type(numeric_type)
+            value = self.create_decimal_integer(start)
+            return self.create_integer_token(int_type, value, start, start_line)
+        
+        if c.isspace() or c in '/\0':
+            value = self.create_decimal_integer(start)
+            return self.create_integer_token(IntegerBuiltInType.I64, value, start, start_line)
+        
+        raise LexerError(f"Invalid decimal literal: unexpected '{c}' in decimal integer.", self.get_file_info(start, start_line))
+
+    def parse_numeric_literal(self, start: int, start_line: int) -> Token:
+        c = self.peek()
+        if c == '-':
+            c = self.advance()
+        
+        if c == '0':
+            c = self.advance()
+            if c in 'bB':
+                self.advance()
+                return self.parse_binary_integer(start, start_line)
+            elif c in 'oO':
+                self.advance()
+                return self.parse_octal_integer(start, start_line)
+            elif c in 'xX':
+                self.advance()
+                return self.parse_hexadecimal_integer(start, start_line)
+        
+        return self.parse_decimal_integer(start, start_line)
+
+    # =====================================================================
+    #  Character Literal Parsing
+    # =====================================================================
+
+    def parse_character_literal(self, start: int, start_line: int) -> Token:
+        c = self.peek()
+        
+        if c == '\'':
+            raise LexerError("Invalid character literal: empty character literal.", self.get_file_info(start, start_line))
+        
+        if c == '\\':
+            c = self.advance()
+            escape_map = {
+                'n': '\n',
+                'r': '\r',
+                't': '\t',
+                '\\': '\\',
+                '\'': '\'',
+                '0': '\0'
+            }
+            if c in escape_map:
+                value = ord(escape_map[c])
+            else:
+                raise LexerError(f"Invalid character literal: unknown escape sequence '\\{c}'.", self.get_file_info(start, start_line))
+        elif c in '\n\r':
+            raise LexerError("Invalid character literal: unclosed character literal.", self.get_file_info(start, start_line))
+        else:
+            value = ord(c)
+        
+        c = self.advance()
+        
+        if c.isspace() or c in '/\0':
+            raise LexerError("Invalid character literal: unclosed character literal.", self.get_file_info(start, start_line))
+        elif c != '\'':
+            raise LexerError(f"Invalid character literal: unexpected '{c}' in character.", self.get_file_info(start, start_line))
+        
+        self.advance()
+        return Token(type=TokenType.CHARACTER, character_literal=value)
+
+    # =====================================================================
+    #  String Literal Parsing (stub)
+    # =====================================================================
+
+    def parse_string_literal(self, start: int, start_line: int) -> Token:
+        raise NotImplementedError("String literals not implemented yet.")
+
+    # =====================================================================
+    #  Token String Parsing
+    # =====================================================================
+
+    def parse_token_string(self, start: int, start_line: int) -> Token:
+        tokens = []
+        self.advance()  # Skip opening '{'
+        
+        watchdog = 0
+        while self.peek() != '\0':
+            self.skip_comments_and_whitespace()
+            c = self.peek()
+            
+            if c == '}':
+                self.advance()
+                return Token(type=TokenType.TOKEN_STRING, token_string=TokenString(tokens=tokens))
+            
+            token = self.lexer_next()
+            tokens.append(token)
+            
+            if token.type == TokenType.EOF:
+                break
+            
+            watchdog += 1
+            if watchdog > 1000000:
+                raise LexerError("Watchdog triggered in token string.", self.get_file_info(start, start_line))
+        
+        raise LexerError("Unclosed token string: missing closing brace '}'.", self.get_file_info(start, start_line))
+
+    # =====================================================================
+    #  Array and Type Tuple Parsing (stubs)
+    # =====================================================================
+
+    def parse_array_literal(self, start: int, start_line: int) -> Token:
+        raise NotImplementedError("Array literals not implemented yet.")
+
+    def parse_type_tuple(self, start: int, start_line: int) -> Token:
+        raise NotImplementedError("Type tuples not implemented yet.")
+
+    # =====================================================================
+    #  Identifier and Boolean Parsing
+    # =====================================================================
+
+    def parse_identifiers_and_booleans(self, start: int, start_line: int) -> Token:
+        c = self.peek()
+        is_literal = False
+        
+        # Check for identifier literal (::)
+        if c == ':' and self.far_peek(1) == ':':
+            is_literal = True
+            self.advance()
+            self.advance()
+            c = self.peek()
+        
+        # Read identifier name
+        name_chars = []
+        while self.is_identifier_continue(c):
+            if c == ':':
+                raise LexerError("Invalid identifier: ':' is not allowed in identifiers.", self.get_file_info(start, start_line))
+            if c == '.':
+                raise LexerError("Invalid identifier: '.' is not allowed in identifiers.", self.get_file_info(start, start_line))
+            name_chars.append(c)
+            c = self.advance()
+        
+        name = ''.join(name_chars)
+        
+        # Check for boolean literals
+        if name == 'false':
+            return Token(type=TokenType.BOOLEAN, boolean_literal=False)
+        elif name == 'true':
+            return Token(type=TokenType.BOOLEAN, boolean_literal=True)
+        else:
+            return Token(type=TokenType.IDENTIFIER, identifier=Identifier(name=name, is_literal=is_literal))
+
+    # =====================================================================
+    #  Main Lexer Logic
+    # =====================================================================
+
+    def lexer_next(self) -> Token:
+        self.skip_comments_and_whitespace()
+        
+        c = self.peek()
+        start = self.info.pos
+        start_line = self.info.line
+        
+        # End of file
+        if c == '\0':
+            return Token(type=TokenType.EOF)
+        
+        # Numeric literals (integers and floats)
+        if c.isdigit() or (c == '.' and self.far_peek(1).isdigit()) or (c == '-' and self.far_peek(1).isdigit()):
+            return self.parse_numeric_literal(start, start_line)
+        
+        # Character literals
+        if c == '\'':
+            self.advance()
+            return self.parse_character_literal(start, start_line)
+        
+        # String literals
+        if c == '"':
+            return self.parse_string_literal(start, start_line)
+        
+        # Token strings
+        if c == '{':
+            return self.parse_token_string(start, start_line)
+        
+        if c == '}':
+            self.advance()
+            raise LexerError("Unexpected closing brace '}' without matching opening brace.", self.get_file_info(start, start_line))
+        
+        # Array literals
+        if c == '[':
+            return self.parse_array_literal(start, start_line)
+        
+        if c == ']':
+            self.advance()
+            raise LexerError("Unexpected closing bracket ']' without matching opening bracket.", self.get_file_info(start, start_line))
+        
+        # Type tuples
+        if c == '(':
+            return self.parse_type_tuple(start, start_line)
+        
+        if c == ')':
+            self.advance()
+            raise LexerError("Unexpected closing parentheses ')' without matching opening parentheses.", self.get_file_info(start, start_line))
+        
+        # Identifiers and booleans
+        if self.is_identifier_start():
+            return self.parse_identifiers_and_booleans(start, start_line)
+        
+        # Check for malformed identifier literal
+        if c == ':':
+            self.advance()
+            if self.far_peek(1) == ':':
+                raise LexerError("Invalid identifier literal: empty identifier after '::'.", self.get_file_info(start, start_line))
+            else:
+                raise LexerError("Unexpected single colon ':'.", self.get_file_info(start, start_line))
+        
+        # Unknown character
+        raise LexerError(f"Unexpected character: unexpected '{c}' during parsing.", self.get_file_info(start, start_line))
+
+    def lexical_analysis(self) -> List[Token]:
+        """Main entry point for lexical analysis."""
+        tokens = []
+        
+        while True:
+            try:
+                token = self.lexer_next()
+                tokens.append(token)
+                
+                if token.type == TokenType.EOF:
+                    break
+            except LexerError as e:
+                # Re-raise lexer errors
+                raise
+        
+        return tokens
+
+
+# =====================================================================
+#  Public API
+# =====================================================================
+
+def lexical_analysis(lexer_info: LexerInfo) -> List[Token]:
+    """Convenience function matching the original C API."""
+    lexer = Lexer(lexer_info)
+    return lexer.lexical_analysis()

SLS_Python/sls_py/meta.py

@@ -0,0 +1,25 @@
+import sys
+try:
+    from ._version import version, commit, timestamp # type: ignore
+except ImportError:
+    version = "unknown"
+    commit = "unknown"
+    timestamp = "unknown"
+
+
+SLS_NAME = "SLS_PYTHON"
+SLS_VERSION = version
+SLS_COMMIT = commit
+
+# Runtime interpreter info (Python equivalent of compiler)
+_impl = sys.implementation
+INTERPRETER_NAME = _impl.name.capitalize()
+INTERPRETER_VER = _impl.version.major
+MODULE_TIMESTAMP = timestamp
+
+SLS_INFO_STRING_1 = f"YREA SLS ({SLS_NAME}) {SLS_VERSION} ({SLS_COMMIT})"
+SLS_INFO_STRING_2 = f"Running on {INTERPRETER_NAME} {INTERPRETER_VER} at {MODULE_TIMESTAMP}"
+
+def print_version() -> None:
+    print(SLS_INFO_STRING_1)
+    print(SLS_INFO_STRING_2)

SLS_Python/sls_py/repl.py

@@ -0,0 +1,83 @@
+from .meta import print_version
+from .lexer import LexerInfo, lexical_analysis
+from .interpreter import InterpreterState, StackType
+
+
+REPL_FILE_NAME = "<STDIN>"
+
+
+def print_top_of_stack(interpreter: InterpreterState) -> None:
+    """Pretty-print top of the stack."""
+
+    item = interpreter.top()
+    if item is None:
+        print("#0: <STACK IS EMPTY>")
+        return
+
+    t = item.type
+
+    if t == StackType.IDENTIFIER:
+        print(f"#0: ::{item.value}")
+    elif t == StackType.I64:
+        print(f"#0: {item.value}")
+    elif t in {StackType.I32, StackType.I16, StackType.I8}:
+        print(f"#0: {item.value}:{t}")
+    elif t in {StackType.U64, StackType.U32, StackType.U16, StackType.U8}:
+        print(f"#0: {item.value}:{t}")
+    elif t == StackType.FLOAT:
+        print(f"#0: {item.value}:f32")
+    elif t == StackType.DOUBLE:
+        print(f"#0: {item.value}")
+    elif t == StackType.CHARACTER:
+        print(f"#0: {item.value}")
+    elif t == StackType.BOOLEAN:
+        print("#0: TRUE" if item.value else "#0: FALSE")
+    elif t == StackType.TOKEN_STRING:
+        print("#0: <TOKEN STRING>")
+    elif t == StackType.CALLABLE:
+        print("#0: <CALLABLE>")
+    else:
+        print(f"#0: <UNKNOWN {t}>")
+
+
+def repl() -> int:
+    """Interactive interpreter loop."""
+
+    print_version()
+    print("===== YREA SLS REPL =====")
+    print("Type `#exit` to exit.")
+
+    interpreter = InterpreterState()
+
+    while True:
+        try:
+            line = input("> ")
+        except EOFError:
+            break
+
+        if line.strip() == "#exit":
+            return 0
+
+        # Create a fresh lexer each iteration
+        lexer_info = LexerInfo(filename=REPL_FILE_NAME, source_code=line)
+
+        try:
+            tokens = lexical_analysis(lexer_info)
+        except Exception as err:
+            print(err)
+            continue
+
+        # Execute tokens in order
+        for token in tokens:
+            try:
+                ok = interpreter.execute(token)
+                if not ok:
+                    print("A runtime error occurred!")
+                    break
+            except Exception as err:
+                print(err)
+                break
+
+        print_top_of_stack(interpreter)
+
+    return 1

SLS_Rust/README.md

@@ -0,0 +1,3 @@
+# SLS Rust
+
+This is the Rust implementation for the YREA SLS interpreter.

SLS_Rust/sls/.gitignore

@@ -0,0 +1,3 @@
+/target
+**/*.rs.bk
+Cargo.lock

SLS_Rust/sls/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "sls_rs"
+version = "0.0.2-alpha"
+edition = "2021"
+
+[dependencies]
+bitflags = "2.4"
+rand = "0.8"
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
+
+[build-dependencies]
+rustc_version = "0.4"
+chrono = "0.4"
+vergen = { version = "8", features = ["build"] }

SLS_Rust/sls/build.rs

@@ -0,0 +1,45 @@
+use std::process::Command;
+use vergen::EmitBuilder;
+
+fn try_cmd(cmd: &mut Command) -> Option<String> {
+    let out = cmd.output().ok()?;
+    if !out.status.success() {
+        return None;
+    }
+    Some(String::from_utf8_lossy(&out.stdout).trim().to_string())
+}
+
+fn main() {
+    // Emit all default vergen build info (BUILD_DATE / BUILD_TIME, etc.)
+    EmitBuilder::builder().all_build();
+
+    // Git describe + commit date (matches your Python logic)
+    let commit_info = (|| {
+        let hash = try_cmd(
+            Command::new("git")
+                .arg("describe")
+                .arg("--always")
+                .arg("--dirty")
+                .arg("--abbrev=7"),
+        )?;
+
+        let date = try_cmd(
+            Command::new("git")
+                .arg("show")
+                .arg("-s")
+                .arg("--format=%ci"),
+        )?;
+
+        Some(format!("{} {}", hash, date))
+    })()
+    .unwrap_or_else(|| "unknown".into());
+
+    println!("cargo:rustc-env=GIT_COMMIT_HASH={}", commit_info);
+
+    // Compiler info
+    println!("cargo:rustc-env=COMPILER_NAME=rustc");
+
+    let rustc_ver = try_cmd(Command::new("rustc").arg("--version"))
+        .unwrap_or_else(|| "unknown".into());
+    println!("cargo:rustc-env=COMPILER_VER={}", rustc_ver);
+}

SLS_Rust/sls/src/file.rs

@@ -0,0 +1,52 @@
+use std::fs;
+
+use crate::interpreter::InterpreterState;
+use crate::lexer::{LexerInfo, lexical_analysis, LexResult};
+
+/// Execute the contents of a script file.
+pub fn exec_file(interpreter: &mut InterpreterState, filename: &str) -> bool {
+    // Read the whole file
+    let source = match fs::read_to_string(filename) {
+        Ok(s) => s,
+        Err(e) => {
+            eprintln!("Cannot read file: {} ({})", filename, e);
+            return false;
+        }
+    };
+
+    let mut lexer_info = LexerInfo::new(filename, source.clone());
+
+    let result = lexical_analysis(&mut lexer_info);
+
+    match result {
+        LexResult::Ok(tokens) => {
+            for token in tokens {
+                if !interpreter.execute(&token) {
+                    return false;
+                }
+            }
+            true
+        }
+
+        LexResult::Err(err) => {
+            dbg!(err);
+            false
+        }
+    }
+}
+
+/// Stand-alone file execution entry point.
+pub fn run_file(filename: &str) -> i32 {
+    println!("Executing file: {}", filename);
+
+    let mut interpreter = InterpreterState::new();
+    if !interpreter.init() {
+        return 1;
+    }
+
+    if exec_file(&mut interpreter, filename) {
+        0
+    } else {
+        1
+    }
+}

SLS_Rust/sls/src/interpreter.rs

@@ -0,0 +1,170 @@
+use std::collections::HashMap;
+use serde::{Serialize, Deserialize};
+
+use crate::lexer::*; // Identifier, Token, TokenString, etc.
+use crate::builtin::{lookup_builtin, load_builtins};
+
+pub type BuiltinFn = fn(&mut InterpreterState) -> bool;
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub enum StackValue {
+    Identifier(Identifier),
+
+    I64(i64),
+    I32(i32),
+    I16(i16),
+    I8(i8),
+
+    U64(u64),
+    U32(u32),
+    U16(u16),
+    U8(u8),
+
+    F32(f32),
+    F64(f64),
+
+    Character(u8),
+    Boolean(bool),
+
+    TokenString(TokenString),
+
+    Callable(TokenString),
+}
+
+#[derive(Debug, Clone)]
+pub struct BuiltinFunction {
+    pub name: String,
+    pub function: BuiltinFn,
+}
+
+impl BuiltinFunction {
+    fn call(&self, interpreter: &mut InterpreterState) -> bool {
+        (self.function)(interpreter)
+    }
+}
+
+impl Serialize for BuiltinFunction {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: serde::Serializer,
+    {
+        serializer.serialize_str(&self.name)
+    }
+}
+
+impl<'de> Deserialize<'de> for BuiltinFunction {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: serde::Deserializer<'de>,
+    {
+        let name = String::deserialize(deserializer)?;
+
+        let function = lookup_builtin(&name)
+            .ok_or_else(|| serde::de::Error::custom(format!("Unknown builtin: {}", name)))?;
+
+        Ok(BuiltinFunction { name, function })
+    }
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub enum FunctionItem {
+    TokenString(TokenString),
+    Builtin(BuiltinFunction),
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct InterpreterState {
+    pub stack: Vec<StackValue>,
+    pub functions: HashMap<String, FunctionItem>,
+}
+
+impl InterpreterState {
+    pub fn new() -> Self {
+        Self {
+            stack: Vec::new(),
+            functions: HashMap::new(),
+        }
+    }
+
+    pub fn init(&mut self) -> bool {
+        load_builtins(self)
+    }
+
+    pub fn push_token(&mut self, token: &Token) -> bool {
+        let value = match token {
+            Token::Eof => return true,
+
+            Token::Identifier(id) => {
+                StackValue::Identifier(id.clone())
+            }
+
+            Token::I64(v) => StackValue::I64(*v),
+            Token::I32(v) => StackValue::I32(*v),
+            Token::I16(v) => StackValue::I16(*v),
+            Token::I8(v)  => StackValue::I8(*v),
+
+            Token::U64(v) => StackValue::U64(*v),
+            Token::U32(v) => StackValue::U32(*v),
+            Token::U16(v) => StackValue::U16(*v),
+            Token::U8(v)  => StackValue::U8(*v),
+
+            Token::Float(v)  => StackValue::F32(*v),
+            Token::Double(v) => StackValue::F64(*v),
+
+            Token::Character(c) => StackValue::Character(*c),
+            Token::Boolean(b)   => StackValue::Boolean(*b),
+
+            Token::TokenString(ts) => StackValue::TokenString(ts.clone()),
+
+            Token::StringLiteral(_) |
+            Token::Array(_) |
+            Token::TypeTuple(_) => return false,
+        };
+
+        self.stack.push(value);
+        true
+    }
+
+    pub fn execute_func(&mut self, key: &str) -> bool {
+        let item = match self.functions.get(key) {
+            Some(v) => v.clone(),
+            None => return false,
+        };
+
+        match item {
+            FunctionItem::Builtin(f) => f.call(self),
+            FunctionItem::TokenString(ts) => self.execute_token_string(&ts),
+        }
+    }
+
+    pub fn execute_token_string(&mut self, ts: &TokenString) -> bool {
+        for token in &ts.tokens {
+            if let Token::Identifier(id) = &token {
+                if !id.is_literal {
+                    if !self.execute_func(&id.name) {
+                        return false;
+                    }
+                    continue;
+                }
+            }
+
+            if !self.push_token(&token) {
+                return false;
+            }
+        }
+        true
+    }
+
+    pub fn execute(&mut self, token: &Token) -> bool {
+        match token {
+            Token::Identifier(id) if !id.is_literal => {
+                self.execute_func(&id.name)
+            }
+            _ => self.push_token(token),
+        }
+    }
+
+    pub fn stack_top(&self) -> Option<&StackValue> {
+        self.stack.last()
+    }
+}

SLS_Rust/sls/src/lexer.rs

@@ -0,0 +1,742 @@
+use serde::{Serialize, Deserialize};
+
+#[derive(Debug, Clone)]
+pub struct LexerInfo {
+    pub filename: String,
+    pub source: String,
+    pub pos: usize,
+    pub column: usize,
+    pub line: usize,
+}
+
+impl LexerInfo {
+    pub fn new(filename: impl Into<String>, source: impl Into<String>) -> Self {
+        Self {
+            filename: filename.into(),
+            source: source.into(),
+            pos: 0,
+            column: 1,
+            line: 1,
+        }
+    }
+
+    fn peek(&self) -> char {
+        self.source.chars().nth(self.pos).unwrap_or('\0')
+    }
+
+    fn far_peek(&self, offset: usize) -> char {
+        self.source.chars().nth(self.pos + offset).unwrap_or('\0')
+    }
+
+    fn advance(&mut self) -> char {
+        if self.peek() == '\n' {
+            self.line += 1;
+            self.column = 1;
+        } else {
+            self.column += 1;
+        }
+        self.pos += 1;
+        self.peek()
+    }
+
+    fn skip_comments_and_whitespace(&mut self) {
+        loop {
+            let c = self.peek();
+            
+            // Skip comments
+            if (c == '/' && self.far_peek(1) == '/') || c == '#' {
+                while self.peek() != '\n' && self.peek() != '\0' {
+                    self.advance();
+                }
+            }
+            
+            // Skip whitespace
+            if self.peek().is_whitespace() {
+                while self.peek().is_whitespace() {
+                    self.advance();
+                }
+            } else {
+                break;
+            }
+        }
+    }
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Identifier {
+    pub name: String,
+    pub is_literal: bool,
+}
+
+#[derive(Debug, Clone)]
+pub enum ArrayLiteral {
+    _Identifiers(Vec<Identifier>),
+    _I64(Vec<i64>),
+    _I32(Vec<i32>),
+    _I16(Vec<i16>),
+    _I8(Vec<i8>),
+    _U64(Vec<u64>),
+    _U32(Vec<u32>),
+    _U16(Vec<u16>),
+    _U8(Vec<u8>),
+    _Float(Vec<f32>),
+    _Double(Vec<f64>),
+    _Character(Vec<u8>),
+    _Strings(Vec<String>),
+    _Boolean(Vec<bool>),
+    _TokenStrings(Vec<TokenString>),
+    _TypeTuples(Vec<TypeTuple>),
+    _StructInline(StructInline),
+}
+
+#[derive(Debug, Clone)]
+pub struct ShapedArray {
+    pub _array: ArrayLiteral,
+    pub _shape: Vec<usize>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct TokenString {
+    pub tokens: Vec<Token>,
+}
+
+#[derive(Debug, Clone)]
+pub struct TypeTuple {
+    pub _inputs: Vec<Identifier>,
+    pub _outputs: Vec<Identifier>,
+}
+
+#[derive(Debug, Clone)]
+pub struct StructInline {
+    pub _name: String,
+    pub _values: Vec<StructValue>,
+}
+
+#[derive(Debug, Clone)]
+pub enum StructValue {
+    _Integer(i64),
+    _Float(f32),
+    _Double(f64),
+    _Boolean(bool),
+    _Character(u8),
+    _String(String),
+    _Token(Token),
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub enum Token {
+    Eof,
+    Identifier(Identifier),
+    I64(i64),
+    I32(i32),
+    I16(i16),
+    I8(i8),
+    U64(u64),
+    U32(u32),
+    U16(u16),
+    U8(u8),
+    Float(f32),
+    Double(f64),
+    Character(u8),
+    #[serde(skip)]
+    StringLiteral(String),
+    Boolean(bool),
+    #[serde(skip)]
+    Array(ShapedArray),
+    TokenString(TokenString),
+    #[serde(skip)]
+    TypeTuple(TypeTuple),
+}
+
+#[derive(Debug, Clone)]
+pub struct LexError {
+    pub message: String,
+    pub file: String,
+    pub line: usize,
+    pub column: usize,
+}
+
+pub type LexResult<T> = Result<T, LexError>;
+
+#[derive(Debug, Clone, Copy)]
+enum NumericLiteralType {
+    Binary,
+    Octal,
+    Decimal,
+    Hexadecimal,
+    Float,
+}
+
+impl LexerInfo {
+    fn make_error(&self, message: impl Into<String>, start_line: usize, start_col: usize) -> LexError {
+        LexError {
+            message: message.into(),
+            file: self.filename.clone(),
+            line: start_line,
+            column: start_col,
+        }
+    }
+
+    fn is_identifier_continue(&self, c: char) -> bool {
+        if !c.is_ascii() || !c.is_ascii_graphic() {
+            return false;
+        }
+        if c == '/' && self.far_peek(1) == '/' {
+            return false;
+        }
+        !matches!(c, '{' | '}' | '[' | ']' | '(' | ')' | '\'' | '"' | '#') && !c.is_whitespace()
+    }
+
+    fn is_identifier_start(&self) -> bool {
+        let mut c = self.peek();
+        if c == ':' && self.far_peek(1) == ':' {
+            c = self.far_peek(2);
+        }
+        !c.is_ascii_digit() && self.is_identifier_continue(c)
+    }
+
+    fn parse_identifiers_and_booleans(&mut self, _start: usize, start_line: usize, start_col: usize) -> LexResult<Token> {
+        let mut c = self.peek();
+        let mut literal = false;
+
+        // Skip leading `::` for identifier literals
+        if c == ':' && self.far_peek(1) == ':' {
+            literal = true;
+            self.advance();
+            c = self.advance();
+        }
+
+        // Read the name
+        let name_start = self.pos;
+        while self.is_identifier_continue(c) {
+            if c == ':' {
+                return Err(self.make_error("Invalid identifier: ':' is not allowed in identifiers.", start_line, start_col));
+            }
+            if c == '.' {
+                return Err(self.make_error("Invalid identifier: '.' is not allowed in identifiers.", start_line, start_col));
+            }
+            c = self.advance();
+        }
+
+        let name = self.source[name_start..self.pos].to_string();
+
+        // Check for booleans
+        match name.as_str() {
+            "false" => Ok(Token::Boolean(false)),
+            "true" => Ok(Token::Boolean(true)),
+            _ => Ok(Token::Identifier(Identifier { name, is_literal: literal })),
+        }
+    }
+
+    fn parse_character_literal(&mut self, start_line: usize, start_col: usize) -> LexResult<Token> {
+        let mut c = self.peek();
+
+        if c == '\'' {
+            return Err(self.make_error("Invalid character literal: empty character literal.", start_line, start_col));
+        }
+
+        let value = if c == '\\' {
+            c = self.advance();
+            match c {
+                'n' => b'\n',
+                'r' => b'\r',
+                't' => b'\t',
+                '\\' => b'\\',
+                '\'' => b'\'',
+                '0' => b'\0',
+                _ => return Err(self.make_error(format!("Invalid character literal: unknown escape sequence '\\{}'.", c), start_line, start_col)),
+            }
+        } else if c == '\n' || c == '\r' {
+            return Err(self.make_error("Invalid character literal: unclosed character literal.", start_line, start_col));
+        } else {
+            c as u8
+        };
+
+        c = self.advance();
+
+        if c.is_whitespace() || c == '/' || c == '\0' {
+            return Err(self.make_error("Invalid character literal: unclosed character literal.", start_line, start_col));
+        } else if c != '\'' {
+            return Err(self.make_error(format!("Invalid character literal: unexpected '{}' in character.", c), start_line, start_col));
+        }
+
+        self.advance();
+        Ok(Token::Character(value))
+    }
+
+    fn parse_token_string(&mut self, _start: usize, start_line: usize, start_col: usize) -> LexResult<Token> {
+        let mut tokens = Vec::new();
+        self.advance(); // skip '{'
+
+        loop {
+            self.skip_comments_and_whitespace();
+            let c = self.peek();
+
+            if c == '}' {
+                self.advance();
+                return Ok(Token::TokenString(TokenString { tokens }));
+            }
+
+            if c == '\0' {
+                return Err(self.make_error("Unclosed token string: missing closing brace '}'.", start_line, start_col));
+            }
+
+            match get_token(self) {
+                Some(token) => {
+                    if matches!(token, Token::Eof) {
+                        break;
+                    }
+                    tokens.push(token);
+                }
+                None => return Err(self.make_error("Failed to parse token in token string.", start_line, start_col)),
+            }
+        }
+
+        Err(self.make_error("Unclosed token string: missing closing brace '}'.", start_line, start_col))
+    }
+
+    fn parse_numeric_literal(&mut self, start: usize, start_line: usize, start_col: usize) -> LexResult<Token> {
+        let mut c = self.peek();
+
+        if c == '-' {
+            c = self.advance();
+        }
+
+        if c == '0' {
+            c = self.advance();
+            match c {
+                'b' | 'B' => {
+                    self.advance();
+                    return self.parse_binary_integer(start, start_line, start_col);
+                }
+                'o' | 'O' => {
+                    self.advance();
+                    return self.parse_octal_integer(start, start_line, start_col);
+                }
+                'x' | 'X' => {
+                    self.advance();
+                    return self.parse_hexadecimal_integer(start, start_line, start_col);
+                }
+                _ => {}
+            }
+        }
+
+        self.parse_decimal_integer(start, start_line, start_col)
+    }
+
+    fn parse_binary_integer(&mut self, start: usize, start_line: usize, start_col: usize) -> LexResult<Token> {
+        let mut c = self.peek();
+        while c == '0' || c == '1' || c == '_' {
+            c = self.advance();
+        }
+
+        if c == ':' {
+            return self.parse_numeric_type(start, start_line, start_col, NumericLiteralType::Binary);
+        }
+
+        let value = self.create_binary_integer(start);
+        Ok(Token::I64(value as i64))
+    }
+
+    fn parse_octal_integer(&mut self, start: usize, start_line: usize, start_col: usize) -> LexResult<Token> {
+        let mut c = self.peek();
+        while c.is_ascii_digit() && c != '8' && c != '9' || c == '_' {
+            c = self.advance();
+        }
+
+        if c == ':' {
+            return self.parse_numeric_type(start, start_line, start_col, NumericLiteralType::Octal);
+        }
+
+        let value = self.create_octal_integer(start);
+        Ok(Token::I64(value as i64))
+    }
+
+    fn parse_decimal_integer(&mut self, start: usize, start_line: usize, start_col: usize) -> LexResult<Token> {
+        let mut c = self.peek();
+        while c.is_ascii_digit() || c == '_' {
+            c = self.advance();
+        }
+
+        if c == '.' {
+            self.advance();
+            return self.parse_float(start, start_line, start_col);
+        }
+
+        if c == ':' {
+            return self.parse_numeric_type(start, start_line, start_col, NumericLiteralType::Decimal);
+        }
+
+        let value = self.create_decimal_integer(start);
+        Ok(Token::I64(value as i64))
+    }
+
+    fn parse_hexadecimal_integer(&mut self, start: usize, start_line: usize, start_col: usize) -> LexResult<Token> {
+        let mut c = self.peek();
+        while c.is_ascii_hexdigit() || c == '_' {
+            c = self.advance();
+        }
+
+        if c == ':' {
+            return self.parse_numeric_type(start, start_line, start_col, NumericLiteralType::Hexadecimal);
+        }
+
+        let value = self.create_hexadecimal_integer(start);
+        Ok(Token::I64(value as i64))
+    }
+
+    fn parse_float(&mut self, start: usize, start_line: usize, start_col: usize) -> LexResult<Token> {
+        let mut c = self.peek();
+        while c.is_ascii_digit() || c == '_' {
+            c = self.advance();
+        }
+
+        if c == ':' {
+            return self.parse_numeric_type(start, start_line, start_col, NumericLiteralType::Float);
+        }
+
+        let value = self.create_float(start);
+        Ok(Token::Double(value))
+    }
+
+    fn parse_numeric_type(&mut self, start: usize, start_line: usize, start_col: usize, literal_type: NumericLiteralType) -> LexResult<Token> {
+        let mut c = self.advance(); // skip ':'
+
+        let mut is_float = false;
+        let mut is_unsigned = false;
+        let bit_size: u32;
+
+        if c == 'f' {
+            is_float = true;
+            if !matches!(literal_type, NumericLiteralType::Decimal | NumericLiteralType::Float) {
+                return Err(self.make_error("Invalid numeric literal: float type not allowed.", start_line, start_col));
+            }
+            c = self.advance();
+            if c == '6' && self.far_peek(1) == '4' {
+                bit_size = 64;
+                self.advance();
+                self.advance();
+            } else if c == '3' && self.far_peek(1) == '2' {
+                bit_size = 32;
+                self.advance();
+                self.advance();
+            } else {
+                return Err(self.make_error("Invalid float type: must be of type 'f64' or 'f32'.", start_line, start_col));
+            }
+        } else if c == 'i' || c == 'u' {
+            if matches!(literal_type, NumericLiteralType::Float) {
+                return Err(self.make_error("Invalid float type: must be of type 'f64' or 'f32'.", start_line, start_col));
+            }
+            is_unsigned = c == 'u';
+            c = self.advance();
+            if c == '6' && self.far_peek(1) == '4' {
+                bit_size = 64;
+                self.advance();
+                self.advance();
+            } else if c == '3' && self.far_peek(1) == '2' {
+                bit_size = 32;
+                self.advance();
+                self.advance();
+            } else if c == '1' && self.far_peek(1) == '6' {
+                bit_size = 16;
+                self.advance();
+                self.advance();
+            } else if c == '8' {
+                bit_size = 8;
+                self.advance();
+            } else {
+                let type_name = if is_unsigned { "unsigned" } else { "signed" };
+                return Err(self.make_error(
+                    format!("Invalid {} integer type: must be of type '{}64', '{}32', '{}16', or '{}8'.",
+                        type_name, if is_unsigned { "u" } else { "i" },
+                        if is_unsigned { "u" } else { "i" },
+                        if is_unsigned { "u" } else { "i" },
+                        if is_unsigned { "u" } else { "i" }),
+                    start_line, start_col));
+            }
+        } else {
+            return Err(self.make_error("Invalid numeric type: type must start with 'f', 'i', or 'u'.", start_line, start_col));
+        }
+
+        // Create the token based on the parsed type
+        if is_float {
+            let value = self.create_float(start);
+            match bit_size {
+                32 => Ok(Token::Float(value as f32)),
+                64 => Ok(Token::Double(value)),
+                _ => unreachable!()
+            }
+        } else {
+            let value = match literal_type {
+                NumericLiteralType::Binary => self.create_binary_integer(start),
+                NumericLiteralType::Octal => self.create_octal_integer(start),
+                NumericLiteralType::Decimal => self.create_decimal_integer(start),
+                NumericLiteralType::Hexadecimal => self.create_hexadecimal_integer(start),
+                NumericLiteralType::Float => return Err(self.make_error("Internal error: float literal in integer path", start_line, start_col)),
+            };
+
+            self.create_integer_token(value, is_unsigned, bit_size, start, start_line, start_col)
+        }
+    }
+
+    fn create_integer_token(&self, value: u64, is_unsigned: bool, bit_size: u32, start: usize, start_line: usize, start_col: usize) -> LexResult<Token> {
+        let is_negative = self.source[start..].starts_with('-');
+
+        match (is_unsigned, bit_size) {
+            (false, 64) => Ok(Token::I64(value as i64)),
+            (false, 32) => {
+                let signed = value as i64;
+                if signed < i32::MIN as i64 || signed > i32::MAX as i64 {
+                    return Err(self.make_error("Integer overflow: value exceeds range for i32.", start_line, start_col));
+                }
+                Ok(Token::I32(value as i32))
+            }
+            (false, 16) => {
+                let signed = value as i64;
+                if signed < i16::MIN as i64 || signed > i16::MAX as i64 {
+                    return Err(self.make_error("Integer overflow: value exceeds range for i16.", start_line, start_col));
+                }
+                Ok(Token::I16(value as i16))
+            }
+            (false, 8) => {
+                let signed = value as i64;
+                if signed < i8::MIN as i64 || signed > i8::MAX as i64 {
+                    return Err(self.make_error("Integer overflow: value exceeds range for i8.", start_line, start_col));
+                }
+                Ok(Token::I8(value as i8))
+            }
+            (true, 64) => {
+                if is_negative {
+                    return Err(self.make_error("Integer overflow: value exceeds range for u64.", start_line, start_col));
+                }
+                Ok(Token::U64(value))
+            }
+            (true, 32) => {
+                if is_negative {
+                    return Err(self.make_error("Integer overflow: value exceeds range for u32.", start_line, start_col));
+                }
+                if value > u32::MAX as u64 {
+                    return Err(self.make_error("Integer overflow: value exceeds range for u32.", start_line, start_col));
+                }
+                Ok(Token::U32(value as u32))
+            }
+            (true, 16) => {
+                if is_negative {
+                    return Err(self.make_error("Integer overflow: value exceeds range for u16.", start_line, start_col));
+                }
+                if value > u16::MAX as u64 {
+                    return Err(self.make_error("Integer overflow: value exceeds range for u16.", start_line, start_col));
+                }
+                Ok(Token::U16(value as u16))
+            }
+            (true, 8) => {
+                if is_negative {
+                    return Err(self.make_error("Integer overflow: value exceeds range for u8.", start_line, start_col));
+                }
+                if value > u8::MAX as u64 {
+                    return Err(self.make_error("Integer overflow: value exceeds range for u8.", start_line, start_col));
+                }
+                Ok(Token::U8(value as u8))
+            }
+            _ => Err(self.make_error("Invalid bit size for integer type.", start_line, start_col))
+        }
+    }
+
+    fn create_binary_integer(&self, start: usize) -> u64 {
+        let token = &self.source[start..self.pos];
+        let mut value = 0u64;
+        let mut i = 2;
+
+        if token.starts_with('-') {
+            i += 1;
+        }
+
+        for c in token[i..].chars() {
+            if c == '_' || c == '.' {
+                continue;
+            }
+            if c.is_whitespace() || c == '/' || c == ':' {
+                break;
+            }
+            value *= 2;
+            if c == '1' {
+                value += 1;
+            }
+        }
+
+        if token.starts_with('-') {
+            (!value).wrapping_add(1)
+        } else {
+            value
+        }
+    }
+
+    fn create_octal_integer(&self, start: usize) -> u64 {
+        let token = &self.source[start..self.pos];
+        let mut value = 0u64;
+        let mut i = 2;
+
+        if token.starts_with('-') {
+            i += 1;
+        }
+
+        for c in token[i..].chars() {
+            if c == '_' || c == '.' {
+                continue;
+            }
+            if c.is_whitespace() || c == '/' || c == ':' {
+                break;
+            }
+            value *= 8;
+            value += c.to_digit(8).unwrap_or(0) as u64;
+        }
+
+        if token.starts_with('-') {
+            (!value).wrapping_add(1)
+        } else {
+            value
+        }
+    }
+
+    fn create_decimal_integer(&self, start: usize) -> u64 {
+        let token = &self.source[start..self.pos];
+        let mut value = 0u64;
+        let mut i = 0;
+
+        if token.starts_with('-') {
+            i += 1;
+        }
+
+        for c in token[i..].chars() {
+            if c == '_' {
+                continue;
+            }
+            if c.is_whitespace() || c == '/' || c == ':' {
+                break;
+            }
+            value *= 10;
+            value += c.to_digit(10).unwrap_or(0) as u64;
+        }
+
+        if token.starts_with('-') {
+            (!value).wrapping_add(1)
+        } else {
+            value
+        }
+    }
+
+    fn create_hexadecimal_integer(&self, start: usize) -> u64 {
+        let token = &self.source[start..self.pos];
+        let mut value = 0u64;
+        let mut i = 2;
+
+        if token.starts_with('-') {
+            i += 1;
+        }
+
+        for c in token[i..].chars() {
+            if c == '_' || c == '.' {
+                continue;
+            }
+            if c.is_whitespace() || c == '/' || c == ':' {
+                break;
+            }
+            value *= 16;
+            value += c.to_digit(16).unwrap_or(0) as u64;
+        }
+
+        if token.starts_with('-') {
+            (!value).wrapping_add(1)
+        } else {
+            value
+        }
+    }
+
+    fn create_float(&self, start: usize) -> f64 {
+        let token = &self.source[start..self.pos];
+        let mut value = 0.0;
+        let mut fractional = 0u64;
+        let mut i = 0;
+
+        if token.starts_with('-') {
+            i += 1;
+        }
+
+        for c in token[i..].chars() {
+            if c == '_' {
+                continue;
+            }
+            if c.is_whitespace() || c == '/' || c == ':' {
+                break;
+            }
+            if c == '.' {
+                fractional = 1;
+                continue;
+            }
+
+            if fractional == 0 {
+                value *= 10.0;
+            } else {
+                fractional *= 10;
+            }
+
+            let digit = c.to_digit(10).unwrap_or(0) as f64;
+            if fractional == 0 {
+                value += digit;
+            } else {
+                value += digit / fractional as f64;
+            }
+        }
+
+        if token.starts_with('-') {
+            -value
+        } else {
+            value
+        }
+    }
+}
+
+pub fn get_token(lexer: &mut LexerInfo) -> Option<Token> {
+    lexer.skip_comments_and_whitespace();
+
+    let c = lexer.peek();
+    let start = lexer.pos;
+    let start_line = lexer.line;
+    let start_col = lexer.column;
+
+    if c == '\0' {
+        return Some(Token::Eof);
+    }
+
+    let result = if c.is_ascii_digit() || (c == '.' && lexer.far_peek(1).is_ascii_digit()) || (c == '-' && lexer.far_peek(1).is_ascii_digit()) {
+        lexer.parse_numeric_literal(start, start_line, start_col)
+    } else if c == '\'' {
+        lexer.advance();
+        lexer.parse_character_literal(start_line, start_col)
+    } else if c == '{' {
+        lexer.parse_token_string(start, start_line, start_col)
+    } else if lexer.is_identifier_start() {
+        lexer.parse_identifiers_and_booleans(start, start_line, start_col)
+    } else {
+        Err(lexer.make_error(format!("Unexpected character: '{}'", c), start_line, start_col))
+    };
+
+    result.ok()
+}
+
+pub fn lexical_analysis(lexer: &mut LexerInfo) -> LexResult<Vec<Token>> {
+    let mut tokens = Vec::new();
+
+    loop {
+        match get_token(lexer) {
+            Some(Token::Eof) => {
+                tokens.push(Token::Eof);
+                break;
+            }
+            Some(token) => tokens.push(token),
+            None => break,
+        }
+    }
+
+    Ok(tokens)
+}

SLS_Rust/sls/src/main.rs

@@ -0,0 +1,63 @@
+mod builtin;
+mod file;
+mod interpreter;
+mod lexer;
+mod repl;
+
+use std::env;
+use std::process;
+
+use file::run_file;
+use repl::repl;
+
+// These mirror the C macros.
+const SLS_NAME: &str = "SLS_RUST";
+const SLS_VER: &str = "0.0.2-alpha";
+
+pub fn print_version() {
+    let git_hash = option_env!("GIT_COMMIT_HASH").unwrap_or("unknown");
+    let compiler = option_env!("COMPILER_NAME").unwrap_or("rustc");
+    let compiler_ver = option_env!("COMPILER_VER").unwrap_or("unknown");
+    let build_date = std::env::var("BUILD_DATE").unwrap_or_else(|_| "unknown".into());
+    let build_time = std::env::var("BUILD_TIME").unwrap_or_else(|_| "unknown".into());
+
+    println!("YREA SLS ({SLS_NAME}) {SLS_VER} ({git_hash})");
+    println!("Compiled with {compiler} {compiler_ver} at {build_date} {build_time}");
+}
+
+fn main() {
+    let mut args = env::args().skip(1);
+
+    let mut version_flag = false;
+    let mut filename: Option<String> = None;
+
+    match args.len() {
+        0 => {}
+        1 => {
+            let arg = args.next().unwrap();
+            if arg == "--version" || arg == "-v" {
+                version_flag = true;
+            } else {
+                filename = Some(arg);
+            }
+        }
+        _ => {
+            eprintln!("Too many arguments!");
+            process::exit(1);
+        }
+    }
+
+    if version_flag {
+        print_version();
+        process::exit(0);
+    }
+
+    if let Some(file) = filename {
+        let status = run_file(&file);
+        process::exit(status);
+    }
+
+    // Default to REPL
+    let status = repl();
+    process::exit(status);
+}

SLS_Rust/sls/src/repl.rs

@@ -0,0 +1,116 @@
+use std::io::{self, Write};
+use std::fs;
+use serde_json;
+
+use crate::lexer::{LexerInfo, LexResult, lexical_analysis};
+use crate::print_version;
+use crate::interpreter::{InterpreterState, StackValue};
+
+static REPL_FILE_NAME: &str = "<STDIN>";
+
+fn print_top_of_stack(state: &InterpreterState) {
+    let Some(item) = state.stack_top() else {
+        println!("#0: <STACK IS EMPTY>");
+        return;
+    };
+
+    match &item {
+        StackValue::Identifier(id) => {
+            println!("#0: ::{}", id.name);
+        }
+        StackValue::I64(v) => println!("#0: {}", v),
+        StackValue::I32(v) => println!("#0: {}:i32", v),
+        StackValue::I16(v) => println!("#0: {}:i16", v),
+        StackValue::I8(v)  => println!("#0: {}:i8", v),
+
+        StackValue::U64(v) => println!("#0: {}:u64", v),
+        StackValue::U32(v) => println!("#0: {}:u32", v),
+        StackValue::U16(v) => println!("#0: {}:u16", v),
+        StackValue::U8(v)  => println!("#0: {}:u8", v),
+
+        StackValue::F32(v) => println!("#0: {}:f32", v),
+        StackValue::F64(v) => println!("#0: {}", v),
+
+        StackValue::Character(ch) => println!("#0: {}", ch),
+        StackValue::Boolean(b) => println!("#0: {}", if *b { "TRUE" } else { "FALSE" }),
+
+        StackValue::TokenString(_) => println!("#0: <TOKEN STRING>"),
+        StackValue::Callable(_)    => println!("#0: <CALLABLE>"),
+    };
+}
+
+pub fn repl() -> i32 {
+    print_version();
+    println!("===== YREA SLS REPL =====");
+    println!("Type `#exit` to exit.");
+    io::stdout().flush().unwrap();
+
+    let mut interpreter = InterpreterState::new();
+    if !interpreter.init() {
+        return 1;
+    }
+
+    let stdin = io::stdin();
+    let mut buf = String::new();
+
+    loop {
+        buf.clear();
+
+        if stdin.read_line(&mut buf).is_err() {
+            return 1;
+        }
+
+        if buf.trim_end() == "#exit" {
+            return 0;
+        }
+
+        if let Some(file) = buf.trim_end().strip_prefix("#save ") {
+            match serde_json::to_string(&interpreter) {
+                Ok(json) => {
+                    if let Err(err) = fs::write(file, json) {
+                        eprintln!("Failed to save state: {}", err);
+                    } else {
+                        println!("State saved to {}", file);
+                    }
+                }
+                Err(err) => eprintln!("Serialization error: {}", err),
+            }
+            continue;
+        }
+
+        if let Some(file) = buf.trim_end().strip_prefix("#load ") {
+            match fs::read_to_string(file) {
+                Ok(json) => match serde_json::from_str(&json) {
+                    Ok(state) => {
+                        interpreter = state;
+                        println!("State restored from {}", file);
+                    }
+                    Err(err) => eprintln!("Deserialization error: {}", err),
+                },
+                Err(err) => eprintln!("Failed to read file: {}", err),
+            }
+            continue;
+        }
+
+        let code = buf.clone();
+        let mut lexer_info = LexerInfo::new(REPL_FILE_NAME, code.clone());
+        let result = lexical_analysis(&mut lexer_info);
+
+        match result {
+            LexResult::Ok(tokens) => {
+                for token in tokens {
+                    if !interpreter.execute(&token) {
+                        eprintln!("A runtime error occured!");
+                        break;
+                    }
+                }
+
+                print_top_of_stack(&interpreter);
+            }
+
+            LexResult::Err(err) => {
+                dbg!(err);
+            }
+        }
+    }
+}

SLS_Tests/generate_tests/__init__.py

@@ -0,0 +1,20 @@
+from .base_tests import BaseTestGenerator
+from .general_tests import GeneralTestGenerator
+from .integer_tests import IntegerTestGenerator
+from .float_tests import FloatTestGenerator
+from .char_tests import CharTestGenerator
+from .string_tests import StringTestGenerator
+from .idents_and_bools_tests import IdentifierTestGenerator, BooleanTestGenerator
+from .token_strings import TokenStringTestGenerator
+
+__all__ = [
+    "BaseTestGenerator",
+    "GeneralTestGenerator",
+    "IntegerTestGenerator",
+    "FloatTestGenerator",
+    "CharTestGenerator",
+    "StringTestGenerator",
+    "IdentifierTestGenerator",
+    "BooleanTestGenerator",
+    "TokenStringTestGenerator",
+]

SLS_Tests/generate_tests/__main__.py

@@ -0,0 +1,23 @@
+"""
+Test case generator for integer literals in the Stack Language.
+Generates comprehensive test cases for all integer types and bases.
+"""
+
+from .base_tests import BaseTestGenerator
+
+if __name__ == "__main__":
+    import yaml
+
+    # Generate tests
+    tests = BaseTestGenerator.run_all_generators()
+    # tests = []
+    # tests += GeneralTestGenerator.generate_tests()
+    # tests += IntegerTestGenerator.generate_tests()
+    # tests += FloatTestGenerator.generate_tests()
+
+    # Print summary
+    print(f"Generated {len(tests)} test cases")
+
+    # Save as YAML
+    with open("cases.yaml", "w") as f:
+        yaml.dump(tests, f, default_flow_style=False, sort_keys=False)

SLS_Tests/generate_tests/base_tests.py

@@ -0,0 +1,405 @@
+from typing import ClassVar, List, Dict, Any, Optional, Type
+from abc import ABC, abstractmethod
+from dataclasses import dataclass, asdict
+
+@dataclass
+class Token:
+    type: str
+    value: Any
+
+
+@dataclass
+class Operation:
+    function: str
+    type: str
+    value: Any
+
+
+@dataclass
+class StackItem:
+    type: str
+    value: Any
+
+
+@dataclass
+class RuntimeError:
+    message: str
+
+
+@dataclass
+class TestCase:
+    name: str
+    code: str
+    tokens: List[Dict[str, Any]]
+    operations: Optional[List[Dict[str, Any]]] = None
+    stack_final: Optional[List[Dict[str, Any]]] = None
+    runtime_error: Optional[Dict[str, str]] = None
+
+
+def to_dict(obj) -> Dict[str, Any]:
+    """Convert dataclass to dict, removing None values."""
+    if obj is None:
+        raise ValueError("Obj cannot be None")
+    d = asdict(obj) if hasattr(obj, '__dataclass_fields__') else obj
+    return {k: v for k, v in d.items() if v is not None}
+
+
+class BaseTestGenerator(ABC):
+    """
+    Abstract base class for test case generators.
+
+    Provides common functionality for generating test cases including
+    test creation, operation building, and error handling.
+    """
+
+    ENABLE_UNICODE = False
+    ENABLE_EXPONENTIAL_LITERALS = False
+    ENABLE_CHAR_HEX_ESCAPE = False
+    ENABLE_STRINGS = False
+
+    __generators: "ClassVar[List[Type[BaseTestGenerator]]]" = []
+
+    def __init_subclass__(cls):
+        BaseTestGenerator.__generators.append(cls)
+
+    def __init__(self):
+        """Initialize the test generator with an empty test list."""
+        self.tests: List[Dict[str, Any]] = []
+
+    # =========================================================================
+    # Test Case Management
+    # =========================================================================
+
+    def add_test(self, name: str, code: str, tokens: List[Token],
+                 operations: Optional[List[Operation]] = None,
+                 stack_final: Optional[List[StackItem]] = None,
+                 runtime_error: Optional[RuntimeError] = None):
+        """
+        Add a test case to the test suite.
+
+        Args:
+            name: Descriptive name for the test
+            code: Source code being tested
+            tokens: List of expected tokens from lexing
+            operations: Optional list of operations for evaluation phase
+            stack_final: Optional final stack state after execution
+            runtime_error: Optional runtime error if test should fail
+        """
+        test = TestCase(
+            name=name,
+            code=code,
+            tokens=[to_dict(t) for t in tokens],
+            operations=[to_dict(o) for o in operations] if operations else None,
+            stack_final=[to_dict(s) for s in stack_final] if stack_final else None,
+            runtime_error=to_dict(runtime_error) if runtime_error else None
+        )
+        self.tests.append(to_dict(test))
+
+    # =========================================================================
+    # Factory Methods
+    # =========================================================================
+
+    def make_push_op(self, type_name: str, value: Any) -> Operation:
+        """
+        Create a push operation.
+
+        Args:
+            type_name: Type of the value being pushed
+            value: The value to push
+
+        Returns:
+            Operation object representing a push
+        """
+        return Operation(function="push", type=type_name, value=value)
+
+    def make_stack_item(self, type_name: str, value: Any) -> StackItem:
+        """
+        Create a stack item.
+
+        Args:
+            type_name: Type of the stack item
+            value: The value of the stack item
+
+        Returns:
+            StackItem object
+        """
+        return StackItem(type=type_name, value=value)
+
+    def make_error_token(self, message: str) -> Token:
+        """
+        Create an error token.
+
+        Args:
+            message: Error message
+
+        Returns:
+            Token object with type "error"
+        """
+        return Token(type="error", value=message)
+
+    def make_runtime_error(self, message: str) -> RuntimeError:
+        """
+        Create a runtime error.
+
+        Args:
+            message: Error message
+
+        Returns:
+            RuntimeError object
+        """
+        return RuntimeError(message=message)
+
+    # =========================================================================
+    # Convenience Test Creators
+    # =========================================================================
+
+    def make_success_test(self, name: str, code: str, type_name: str, value: Any):
+        """
+        Create a successful test case with standard push operation.
+
+        Args:
+            name: Test name
+            code: Source code
+            type_name: Type of the value
+            value: The value
+        """
+        token = Token(type=type_name, value=value)
+        op = self.make_push_op(type_name, value)
+        stack = self.make_stack_item(type_name, value)
+        self.add_test(name, code, [token], [op], [stack])
+
+    def make_error_test(self, name: str, code: str, error_msg: str):
+        """
+        Create an error test case (lexing error).
+
+        Args:
+            name: Test name
+            code: Source code
+            error_msg: Expected error message
+        """
+        token = self.make_error_token(error_msg)
+        self.add_test(name, code, [token])
+
+    def make_runtime_error_test(self, name: str, code: str, tokens: List[Token],
+                                 operations: List[Operation], error_msg: str):
+        """
+        Create a runtime error test case.
+
+        Args:
+            name: Test name
+            code: Source code
+            tokens: Tokens that were successfully lexed
+            operations: Operations that led to the error
+            error_msg: Expected runtime error message
+        """
+        runtime_error = self.make_runtime_error(error_msg)
+        self.add_test(name, code, tokens, operations, None, runtime_error)
+
+    def make_empty_test(self, name: str, code: str):
+        """
+        Create a test case with empty result (e.g., comments, whitespace).
+
+        Args:
+            name: Test name
+            code: Source code
+        """
+        self.add_test(name, code, [], [], [])
+
+    # =========================================================================
+    # Multi-Value Test Helpers
+    # =========================================================================
+
+    def make_multi_value_test(self, name: str, code: str,
+                             values: List[tuple[str, Any]]):
+        """
+        Create a test with multiple values on the stack.
+
+        Args:
+            name: Test name
+            code: Source code
+            values: List of (type_name, value) tuples in stack order
+        """
+        tokens = [Token(type=t, value=v) for t, v in values]
+        operations = [self.make_push_op(t, v) for t, v in values]
+        stack = [self.make_stack_item(t, v) for t, v in values]
+        self.add_test(name, code, tokens, operations, stack)
+
+    # =========================================================================
+    # Test Suite Generation
+    # =========================================================================
+
+    @abstractmethod
+    def generate_all_tests(self) -> List[Dict[str, Any]]:
+        """
+        Generate all test cases for this generator.
+
+        Must be implemented by subclasses to define their specific test suite.
+
+        Returns:
+            List of test case dictionaries ready for serialization
+        """
+        pass
+
+    def get_tests(self) -> List[Dict[str, Any]]:
+        """
+        Get the current list of tests.
+
+        Returns:
+            List of test case dictionaries
+        """
+        return self.tests
+
+    def clear_tests(self):
+        """Clear all tests from the generator."""
+        self.tests = []
+
+    def test_count(self) -> int:
+        """
+        Get the number of tests generated.
+
+        Returns:
+            Number of tests
+        """
+        return len(self.tests)
+
+    @classmethod
+    def generate_tests(cls) -> List[Dict[str, Any]]:
+        gen = cls()
+        tests = gen.generate_all_tests()
+        gen.print_statistics()
+        return tests
+
+    @classmethod
+    def run_all_generators(cls) -> List[Dict[str, Any]]:
+        tests = []
+        for sub_cls in cls.__generators:
+            tests += sub_cls.generate_tests()
+        return tests
+
+    # =========================================================================
+    # Test Organization Helpers
+    # =========================================================================
+
+    def add_test_group_comment(self, comment: str):
+        """
+        Add a comment to organize test groups (for documentation).
+
+        Note: This doesn't add an actual test, just tracks organization
+        in subclass implementations.
+
+        Args:
+            comment: Comment describing the test group
+        """
+        # Subclasses can override to add metadata or logging
+        pass
+
+    # =========================================================================
+    # Validation Helpers
+    # =========================================================================
+
+    def validate_test_names_unique(self) -> bool:
+        """
+        Check if all test names are unique.
+
+        Returns:
+            True if all test names are unique, False otherwise
+        """
+        names = [test['name'] for test in self.tests]
+        return len(names) == len(set(names))
+
+    def get_duplicate_test_names(self) -> List[str]:
+        """
+        Get list of duplicate test names.
+
+        Returns:
+            List of test names that appear more than once
+        """
+        names = [test['name'] for test in self.tests]
+        seen = set()
+        duplicates = set()
+        for name in names:
+            if name in seen:
+                duplicates.add(name)
+            seen.add(name)
+        return list(duplicates)
+
+    # =========================================================================
+    # Statistics
+    # =========================================================================
+
+    def get_test_statistics(self) -> Dict[str, int]:
+        """
+        Get statistics about the generated tests.
+
+        Returns:
+            Dictionary with test statistics
+        """
+        stats = {
+            'total': len(self.tests),
+            'success': 0,
+            'lex_error': 0,
+            'runtime_error': 0,
+            'empty': 0,
+        }
+
+        for test in self.tests:
+            if test.get('runtime_error'):
+                stats['runtime_error'] += 1
+            elif test.get('tokens') and test['tokens'][0].get('type') == 'error':
+                stats['lex_error'] += 1
+            elif not test.get('tokens'):
+                stats['empty'] += 1
+            else:
+                stats['success'] += 1
+
+        return stats
+
+    def print_statistics(self):
+        """Print test statistics to console."""
+        stats = self.get_test_statistics()
+        print(f"Test Statistics for {self.__class__.__name__}:")
+        print(f"  Total tests: {stats['total']}")
+        print(f"  Success tests: {stats['success']}")
+        print(f"  Lex error tests: {stats['lex_error']}")
+        print(f"  Runtime error tests: {stats['runtime_error']}")
+        print(f"  Empty tests: {stats['empty']}")
+
+        if not self.validate_test_names_unique():
+            duplicates = self.get_duplicate_test_names()
+            print(f"  WARNING: Duplicate test names found: {duplicates}")
+
+    # =========================================================================
+    # Token String Helpers
+    # =========================================================================
+
+    def make_token_string_token(self, inner_tokens: List[Token]) -> Token:
+        """
+        Create a token string token containing inner tokens.
+
+        Args:
+            inner_tokens: List of tokens inside the token string
+
+        Returns:
+            Token with type "token_string" and tokens array
+        """
+        return Token(type="token_string", value=[t.__dict__ for t in inner_tokens])
+
+    def make_token_string_test(self, name: str, code: str, inner_tokens: List[Token]):
+        """
+        Create a successful token string test.
+
+        Args:
+            name: Test name
+            code: Source code
+            inner_tokens: Tokens inside the token string
+        """
+        token = self.make_token_string_token(inner_tokens)
+
+        # For operations, we push the token string as a value
+        op_value = {"tokens": [t.__dict__ for t in inner_tokens]}
+        op = self.make_push_op("token_string", op_value)
+
+        # On the stack, it's a token_string value
+        stack = self.make_stack_item("token_string", op_value)
+
+        self.add_test(name, code, [token], [op], [stack])

SLS_Tests/generate_tests/char_tests.py

@@ -0,0 +1,299 @@
+from typing import List, Dict, Any
+from .base_tests import BaseTestGenerator
+
+
+class CharTestGenerator(BaseTestGenerator):
+    """Generate test cases for character literals."""
+    
+    # Common escape sequences
+    ESCAPE_SEQUENCES = {
+        ("Newline", '\\\\n', '\n',),          # Newline
+        ("Carriage return", '\\\\r', '\r',),  # Carriage return
+        ("Tab", '\\\\t', '\t',),              # Tab
+        ("Backslash", '\\\\\\\\', '\\',),     # Backslash
+        ("Single quote", "\\\\'", "'",),      # Single quote
+        ("Null character", '\\\\0', '\0',),   # Null character
+    }
+    
+    # Unicode escape examples
+    UNICODE_ESCAPES = {
+        '\\u{41}': 'A',
+        '\\u{1F600}': '😀',
+        '\\u{2764}': '❤',
+        '\\u{0041}': 'A',
+        '\\u{03B1}': 'α',
+        '\\u{4E2D}': '中',
+    }
+    
+    def generate_basic_tests(self):
+        """Generate basic character literal tests."""
+        # Simple ASCII letters
+        self.make_success_test("Char Simple Letter Uppercase A", "'A'", "char", 'A')
+        self.make_success_test("Char Simple Letter Lowercase a", "'a'", "char", 'a')
+        self.make_success_test("Char Simple Letter Uppercase Z", "'Z'", "char", 'Z')
+        self.make_success_test("Char Simple Letter Lowercase z", "'z'", "char", 'z')
+        
+        # Digits
+        self.make_success_test("Char Digit 0", "'0'", "char", '0')
+        self.make_success_test("Char Digit 5", "'5'", "char", '5')
+        self.make_success_test("Char Digit 9", "'9'", "char", '9')
+        
+        # Special characters
+        self.make_success_test("Char Space", "' '", "char", ' ')
+        self.make_success_test("Char Exclamation", "'!'", "char", '!')
+        self.make_success_test("Char Question Mark", "'?'", "char", '?')
+        self.make_success_test("Char Period", "'.'", "char", '.')
+        self.make_success_test("Char Comma", "','", "char", ',')
+        self.make_success_test("Char Semicolon", "';'", "char", ';')
+        self.make_success_test("Char Colon", "':'", "char", ':')
+        
+        # Operators and symbols
+        self.make_success_test("Char Plus", "'+'", "char", '+')
+        self.make_success_test("Char Minus", "'-'", "char", '-')
+        self.make_success_test("Char Asterisk", "'*'", "char", '*')
+        self.make_success_test("Char Slash", "'/'", "char", '/')
+        self.make_success_test("Char Equals", "'='", "char", '=')
+        self.make_success_test("Char Less Than", "'<'", "char", '<')
+        self.make_success_test("Char Greater Than", "'>'", "char", '>')
+        
+        # Brackets and braces
+        self.make_success_test("Char Left Paren", "'('", "char", '(')
+        self.make_success_test("Char Right Paren", "')'", "char", ')')
+        self.make_success_test("Char Left Bracket", "'['", "char", '[')
+        self.make_success_test("Char Right Bracket", "']'", "char", ']')
+        self.make_success_test("Char Left Brace", "'{'", "char", '{')
+        self.make_success_test("Char Right Brace", "'}'", "char", '}')
+    
+    def generate_escape_sequence_tests(self):
+        """Generate tests for escape sequences."""
+        # Standard escape sequences
+        for escape_name, escape_str, char_val in self.ESCAPE_SEQUENCES:
+            name = f"Char Escape {escape_name}"
+            code = f"'{escape_str}'"
+            self.make_success_test(name, code, "char", char_val)
+    
+    def generate_hexadecimal_escape_tests(self):
+        """Generate tests for hexadecimal escape sequences."""
+        if self.ENABLE_CHAR_HEX_ESCAPE:
+            # Additional specific hex escapes
+            self.make_success_test("Char Hex Lowercase A", "'\\\\x61'", "char", 'a')
+            self.make_success_test("Char Hex Uppercase A", "'\\\\x41'", "char", 'A')
+            self.make_success_test("Char Hex Space", "'\\\\x20'", "char", ' ')
+            self.make_success_test("Char Hex Tab", "'\\\\x09'", "char", '\t')
+            self.make_success_test("Char Hex Newline", "'\\\\x0A'", "char", '\n')
+            self.make_success_test("Char Hex Max ASCII", "'\\\\x7F'", "char", '\x7F')
+    
+    def generate_unicode_escape_tests(self):
+        """Generate tests for Unicode escape sequences."""
+        for escape_str, char_val in self.UNICODE_ESCAPES.items():
+            name = f"Char Unicode {escape_str}"
+            code = f"'{escape_str}'"
+            self.make_success_test(name, code, "char", char_val)
+        
+        # Additional Unicode tests
+        self.make_success_test("Char Unicode Smiley", "'\\u{1F600}'", "char", '😀')
+        self.make_success_test("Char Unicode Heart", "'\\u{2764}'", "char", '❤')
+        self.make_success_test("Char Unicode Star", "'\\u{2B50}'", "char", '⭐')
+        self.make_success_test("Char Unicode Greek Alpha", "'\\u{03B1}'", "char", 'α')
+        self.make_success_test("Char Unicode Greek Beta", "'\\u{03B2}'", "char", 'β')
+        self.make_success_test("Char Unicode Chinese", "'\\u{4E2D}'", "char", '中')
+        self.make_success_test("Char Unicode Arabic", "'\\u{0639}'", "char", 'ع')
+        self.make_success_test("Char Unicode Cyrillic", "'\\u{0410}'", "char", 'А')
+    
+    def generate_unicode_direct_tests(self):
+        """Generate tests for direct Unicode characters."""
+        # Emoji
+        self.make_success_test("Char Direct Emoji Smiley", "'😀'", "char", '😀')
+        self.make_success_test("Char Direct Emoji Heart", "'❤'", "char", '❤')
+        self.make_success_test("Char Direct Emoji Star", "'⭐'", "char", '⭐')
+        self.make_success_test("Char Direct Emoji Thumbs Up", "'👍'", "char", '👍')
+        
+        # Greek letters
+        self.make_success_test("Char Direct Greek Alpha", "'α'", "char", 'α')
+        self.make_success_test("Char Direct Greek Beta", "'β'", "char", 'β')
+        self.make_success_test("Char Direct Greek Pi", "'π'", "char", 'π')
+        self.make_success_test("Char Direct Greek Omega", "'Ω'", "char", 'Ω')
+        
+        # Chinese characters
+        self.make_success_test("Char Direct Chinese Middle", "'中'", "char", '中')
+        self.make_success_test("Char Direct Chinese Character", "'文'", "char", '文')
+        
+        # Arabic
+        self.make_success_test("Char Direct Arabic Letter", "'ع'", "char", 'ع')
+        
+        # Cyrillic
+        self.make_success_test("Char Direct Cyrillic A", "'А'", "char", 'А')
+        self.make_success_test("Char Direct Cyrillic Ya", "'Я'", "char", 'Я')
+        
+        # Mathematical symbols
+        self.make_success_test("Char Direct Infinity", "'∞'", "char", '∞')
+        self.make_success_test("Char Direct Sum", "'∑'", "char", '∑')
+        self.make_success_test("Char Direct Integral", "'∫'", "char", '∫')
+    
+    def generate_whitespace_tests(self):
+        """Generate tests with whitespace around character literals."""
+        self.make_success_test("Char With Leading Whitespace", "  'A'", "char", 'A')
+        self.make_success_test("Char With Trailing Whitespace", "'A'  ", "char", 'A')
+        self.make_success_test("Char With Both Whitespace", "  'A'  ", "char", 'A')
+        self.make_success_test("Char Tab Before", "\\t'B'", "char", 'B')
+        self.make_success_test("Char Newline Before", "\\n'C'", "char", 'C')
+    
+    def generate_error_tests(self):
+        """Generate error test cases."""
+        # Empty character literal
+        self.make_error_test("Char Empty Literal",
+                           "''",
+                           "Invalid character literal: empty character literal.")
+        
+        # Multiple characters (no escape)
+        self.make_error_test("Char Multiple Characters",
+                           "'AB'",
+                           "Invalid character literal: unexpected 'B' in character.")
+        
+        # Unclosed quote
+        self.make_error_test("Char Unclosed Quote",
+                           "'A",
+                           "Invalid character literal: unclosed character literal.")
+        
+        # Unescaped newline
+        self.make_error_test("Char Unescaped Newline",
+                           "'\\n'",
+                           "Invalid character literal: unclosed character literal.")
+        
+        # Invalid escape sequence
+        self.make_error_test("Char Invalid Escape",
+                           "'\\\\q'",
+                           "Invalid character literal: unknown escape sequence '\\\\q'.")
+        
+        # Invalid hex escape (not 2 digits)
+        if self.ENABLE_CHAR_HEX_ESCAPE:
+            self.make_error_test("Char Hex Escape Too Short",
+                            "'\\\\x4'",
+                            "Invalid character literal: hexadecimal escape must have exactly 2 digits.")
+            
+            self.make_error_test("Char Hex Escape Too Long",
+                            "'\\\\x414'",
+                            "Invalid character literal: hexadecimal escape must have exactly 2 digits.")
+            
+            # Invalid hex digits
+            self.make_error_test("Char Hex Invalid Digit",
+                            "'\\\\xGG'",
+                            "Invalid character literal: invalid hexadecimal digit 'G'.")
+        
+        if self.ENABLE_UNICODE:
+            # Invalid Unicode escape (no braces)
+            self.make_error_test("Char Unicode No Braces",
+                            "'\\u1F600'",
+                            "Invalid character literal: Unicode escape must use braces \\u{...}.")
+            
+            # Invalid Unicode escape (empty)
+            self.make_error_test("Char Unicode Empty",
+                            "'\\u{}'",
+                            "Invalid character literal: empty Unicode escape sequence.")
+            
+            # Invalid Unicode escape (too many digits)
+            self.make_error_test("Char Unicode Too Many Digits",
+                            "'\\u{1234567}'",
+                            "Invalid character literal: Unicode escape sequence too long (max 6 hex digits).")
+            
+            # Invalid Unicode escape (invalid code point)
+            self.make_error_test("Char Unicode Invalid Code Point",
+                            "'\\u{D800}'",
+                            "Invalid character literal: invalid Unicode code point (surrogate range).")
+            
+            self.make_error_test("Char Unicode Out Of Range",
+                            "'\\u{110000}'",
+                            "Invalid character literal: Unicode code point out of range (max 0x10FFFF).")
+            
+            # Invalid Unicode escape (non-hex digits)
+            self.make_error_test("Char Unicode Invalid Hex",
+                            "'\\u{GGGG}'",
+                            "Invalid character literal: invalid hexadecimal digit 'G' in Unicode escape.")
+            
+            # Unclosed Unicode escape
+            self.make_error_test("Char Unicode Unclosed",
+                            "'\\u{1F600'",
+                            "Invalid character literal: unclosed Unicode escape sequence.")
+    
+    def generate_edge_case_tests(self):
+        """Generate edge case tests."""
+        if self.ENABLE_CHAR_HEX_ESCAPE:
+            # ASCII control characters
+            self.make_success_test("Char ASCII Control SOH", "'\\\\x01'", "char", '\x01')
+            self.make_success_test("Char ASCII Control BEL", "'\\\\x07'", "char", '\x07')
+            self.make_success_test("Char ASCII Control ESC", "'\\\\x1B'", "char", '\x1B')
+            self.make_success_test("Char ASCII Control DEL", "'\\\\x7F'", "char", '\x7F')
+            
+            # Extended ASCII
+            self.make_success_test("Char Extended ASCII Lower", "'\\\\x80'", "char", '\x80')
+            self.make_success_test("Char Extended ASCII Upper", "'\\\\xFF'", "char", '\xFF')
+        
+        if self.ENABLE_UNICODE:
+            # Zero-width characters
+            self.make_success_test("Char Zero Width Space", "'\\u{200B}'", "char", '\u200B')
+            self.make_success_test("Char Zero Width Joiner", "'\\u{200D}'", "char", '\u200D')
+            
+            # Right-to-left marks
+            self.make_success_test("Char RTL Mark", "'\\u{200F}'", "char", '\u200F')
+            
+            # Combining characters
+            self.make_success_test("Char Combining Acute", "'\\u{0301}'", "char", '\u0301')
+            
+            # Low Unicode values
+            self.make_success_test("Char Unicode Zero", "'\\u{0}'", "char", '\0')
+            self.make_success_test("Char Unicode One", "'\\u{1}'", "char", '\x01')
+            
+            # High Unicode values (but valid)
+            self.make_success_test("Char Unicode High Valid", "'\\u{10FFFF}'", "char", '\U0010FFFF')
+    
+    def generate_case_sensitivity_tests(self):
+        """Generate tests for case sensitivity in escape sequences."""
+        if self.ENABLE_CHAR_HEX_ESCAPE:
+            # Hex escapes - lowercase x
+            self.make_success_test("Char Hex Lowercase x", "'\\\\x41'", "char", 'A')
+            
+            # Hex digits - both cases
+            self.make_success_test("Char Hex Digits Uppercase", "'\\\\xFF'", "char", '\xFF')
+            self.make_success_test("Char Hex Digits Lowercase", "'\\\\xff'", "char", '\xff')
+            self.make_success_test("Char Hex Digits Mixed", "'\\\\xAb'", "char", '\xAB')
+        
+        if self.ENABLE_UNICODE:
+            # Unicode escapes - lowercase u
+            self.make_success_test("Char Unicode Lowercase u", "'\\u{41}'", "char", 'A')
+            
+            # Unicode hex digits - both cases
+            self.make_success_test("Char Unicode Hex Uppercase", "'\\u{1F600}'", "char", '😀')
+            self.make_success_test("Char Unicode Hex Lowercase", "'\\u{1f600}'", "char", '😀')
+            self.make_success_test("Char Unicode Hex Mixed", "'\\u{1F60a}'", "char", '😊')
+    
+    def generate_all_tests(self) -> List[Dict[str, Any]]:
+        """Generate all character literal test cases."""
+        # Basic tests
+        self.generate_basic_tests()
+        
+        # Escape sequences
+        self.generate_escape_sequence_tests()
+        
+        # Hexadecimal escapes
+        self.generate_hexadecimal_escape_tests()
+        
+        if self.ENABLE_UNICODE:
+            # Unicode escapes
+            self.generate_unicode_escape_tests()
+            
+            # Direct Unicode characters
+            self.generate_unicode_direct_tests()
+        
+        # Whitespace handling
+        self.generate_whitespace_tests()
+        
+        # Error cases
+        self.generate_error_tests()
+        
+        # Edge cases
+        self.generate_edge_case_tests()
+        
+        # Case sensitivity
+        self.generate_case_sensitivity_tests()
+        
+        return self.get_tests()

SLS_Tests/generate_tests/float_tests.py

@@ -0,0 +1,304 @@
+from typing import List, Dict, Any
+from .base_tests import BaseTestGenerator
+
+class FloatTestGenerator(BaseTestGenerator):
+    """Generate test cases for floating point literals."""
+
+    # Special float values
+    SPECIAL_VALUES = {
+        'f32': {
+            'min': -3.4028235e38,
+            'max': 3.4028235e38,
+            'min_positive': 1.1754944e-38,
+            'epsilon': 1.1920929e-7,
+        },
+        'f64': {
+            'min': -1.7976931348623157e308,
+            'max': 1.7976931348623157e308,
+            'min_positive': 2.2250738585072014e-308,
+            'epsilon': 2.220446049250313e-16,
+        }
+    }
+
+    def generate_basic_tests(self):
+        """Generate basic test cases."""
+        # Simple default floats (f64)
+        self.make_success_test("Float Default Simple", "3.14", "f64", 3.14)
+        self.make_success_test("Float Default Zero", "0.0", "f64", 0.0)
+        self.make_success_test("Float Default Negative", "-2.5", "f64", -2.5)
+        self.make_success_test("Float Default One", "1.0", "f64", 1.0)
+
+        # Simple with type annotation
+        self.make_success_test("Float f32 Simple", "3.14:f32", "f32", 3.14)
+        self.make_success_test("Float f64 Simple", "2.718:f64", "f64", 2.718)
+
+    def generate_format_tests(self):
+        """Generate tests for different float formats."""
+        # Leading zeros
+        self.make_success_test("Float Default Leading Zeros", "00042.5", "f64", 42.5)
+        self.make_success_test("Float Default Leading Zero Decimal", "0.5", "f64", 0.5)
+
+        # Trailing zeros
+        self.make_success_test("Float Default Trailing Zeros", "3.1400", "f64", 3.14)
+
+        # No leading digit
+        self.make_success_test("Float Default No Leading Digit", ".5", "f64", 0.5)
+        self.make_success_test("Float Default No Leading Digit Negative", "-.25", "f64", -0.25)
+
+        # No trailing digits
+        self.make_success_test("Float Default No Trailing Digits", "42.", "f64", 42.0)
+        self.make_success_test("Float Default No Trailing Digits Negative", "-7.", "f64", -7.0)
+
+        if self.ENABLE_EXPONENTIAL_LITERALS:
+            # Scientific notation
+            self.make_success_test("Float Default Scientific Positive Exp", "1.5e10", "f64", 1.5e10)
+            self.make_success_test("Float Default Scientific Negative Exp", "2.5e-5", "f64", 2.5e-5)
+            self.make_success_test("Float Default Scientific Capital E", "3.14E8", "f64", 3.14e8)
+            self.make_success_test("Float Default Scientific Plus Sign", "1.0e+3", "f64", 1000.0)
+
+        # Very small numbers
+        self.make_success_test("Float Default Very Small", "0.000001", "f64", 0.000001)
+        if self.ENABLE_EXPONENTIAL_LITERALS:
+            self.make_success_test("Float Default Scientific Very Small", "1.0e-20", "f64", 1.0e-20)
+
+        # Very large numbers
+        self.make_success_test("Float Default Very Large", "1000000.0", "f64", 1000000.0)
+        if self.ENABLE_EXPONENTIAL_LITERALS:
+            self.make_success_test("Float Default Scientific Very Large", "1.0e20", "f64", 1.0e20)
+
+    def generate_underscore_tests(self):
+        """Generate tests for underscores in floats."""
+        # Underscores in integer part
+        self.make_success_test("Float Default Underscore Integer Part",
+                              "1_000_000.5", "f64", 1000000.5)
+
+        # Underscores in decimal part
+        self.make_success_test("Float Default Underscore Decimal Part",
+                              "3.141_592_653", "f64", 3.141592653)
+
+        # Underscores in both parts
+        self.make_success_test("Float Default Underscore Both Parts",
+                              "1_234.567_89", "f64", 1234.56789)
+
+        if self.ENABLE_EXPONENTIAL_LITERALS:
+            # Underscores in scientific notation
+            self.make_success_test("Float Default Underscore Scientific Mantissa",
+                                "1_000.5e10", "f64", 1000.5e10)
+            self.make_success_test("Float Default Underscore Scientific Exponent",
+                                "1.5e1_0", "f64", 1.5e10)
+
+        # Trailing underscore
+        self.make_success_test("Float Default Underscore Trailing", "42.5_", "f64", 42.5)
+
+        # Double underscore
+        self.make_success_test("Float Default Underscore Double", "4__2.5", "f64", 42.5)
+
+        # With type annotation
+        self.make_success_test("Float f32 With Underscores",
+                              "1_234.567_89:f32", "f32", 1234.56789)
+
+    def generate_special_value_tests(self):
+        """Generate tests for special float values."""
+        # Infinity
+        self.make_success_test("Float Default Positive Infinity", "inf", "f64", float('inf'))
+        self.make_success_test("Float Default Negative Infinity", "-inf", "f64", float('-inf'))
+        self.make_success_test("Float f32 Positive Infinity", "inf:f32", "f32", float('inf'))
+        self.make_success_test("Float f32 Negative Infinity", "-inf:f32", "f32", float('-inf'))
+
+        # NaN
+        self.make_success_test("Float Default NaN", "nan", "f64", float('nan'))
+        self.make_success_test("Float f32 NaN", "nan:f32", "f32", float('nan'))
+
+        # Note: NaN comparison is special - NaN != NaN, so these tests may need
+        # special handling in the test runner
+
+    def generate_edge_case_tests(self, type_name: str):
+        """Generate edge case tests for a specific float type."""
+        values = self.SPECIAL_VALUES[type_name]
+
+        if self.ENABLE_EXPONENTIAL_LITERALS:
+            # Maximum value
+            self.make_success_test(f"Float {type_name} Max Value",
+                                f"{values['max']}:{type_name}", type_name, values['max'])
+
+            # Minimum value (most negative)
+            self.make_success_test(f"Float {type_name} Min Value",
+                                f"{values['min']}:{type_name}", type_name, values['min'])
+
+            # Smallest positive normalized value
+            self.make_success_test(f"Float {type_name} Min Positive",
+                                f"{values['min_positive']}:{type_name}",
+                                type_name, values['min_positive'])
+
+            # Machine epsilon
+            self.make_success_test(f"Float {type_name} Epsilon",
+                                f"{values['epsilon']}:{type_name}",
+                                type_name, values['epsilon'])
+
+            # Near zero
+            self.make_success_test(f"Float {type_name} Near Zero Positive",
+                                f"1e-30:{type_name}", type_name, 1e-30)
+            self.make_success_test(f"Float {type_name} Near Zero Negative",
+                                f"-1e-30:{type_name}", type_name, -1e-30)
+
+            # Subnormal numbers
+            if type_name == 'f64':
+                self.make_success_test("Float f64 Subnormal",
+                                    "1e-320:f64", "f64", 1e-320)
+            elif type_name == 'f32':
+                self.make_success_test("Float f32 Subnormal",
+                                    "1e-40:f32", "f32", 1e-40)
+
+    def generate_overflow_tests(self):
+        """Generate overflow tests."""
+        if self.ENABLE_EXPONENTIAL_LITERALS:
+            # f32 overflow
+            self.make_error_test("Float f32 Overflow Positive",
+                            "1e40:f32",
+                            "Float overflow: value exceeds range for f32.")
+            self.make_error_test("Float f32 Overflow Negative",
+                            "-1e40:f32",
+                            "Float overflow: value exceeds range for f32.")
+
+            # f64 overflow (extremely large values)
+            self.make_error_test("Float f64 Overflow Positive",
+                            "1e310:f64",
+                            "Float overflow: value exceeds range for f64.")
+            self.make_error_test("Float f64 Overflow Negative",
+                            "-1e310:f64",
+                            "Float overflow: value exceeds range for f64.")
+
+    def generate_precision_tests(self):
+        """Generate tests for precision limits."""
+        # f32 precision (~7 decimal digits)
+        self.make_success_test("Float f32 Precision Limit",
+                              "1.2345678:f32", "f32", 1.2345678)
+        self.make_success_test("Float f32 High Precision",
+                              "3.141592653589793:f32", "f32", 3.141592653589793)
+
+        # f64 precision (~15 decimal digits)
+        self.make_success_test("Float f64 Precision Limit",
+                              "1.234567890123456:f64", "f64", 1.234567890123456)
+        self.make_success_test("Float f64 High Precision",
+                              "3.141592653589793238:f64", "f64", 3.141592653589793238)
+
+        # Very close numbers
+        self.make_success_test("Float f64 Close Numbers 1",
+                              "1.0000000000000001:f64", "f64", 1.0000000000000001)
+        self.make_success_test("Float f64 Close Numbers 2",
+                              "1.0000000000000002:f64", "f64", 1.0000000000000002)
+
+    def generate_error_tests(self):
+        """Generate error tests."""
+        # Invalid formats
+        self.make_error_test("Float Invalid Multiple Decimal Points",
+                           "3.14.159",
+                           "Invalid float literal: unexpected '.' in float.")
+        self.make_error_test("Float Invalid Characters",
+                           "3.1a4",
+                           "Invalid float literal: unexpected 'a' in float.")
+
+        if self.ENABLE_EXPONENTIAL_LITERALS:
+            # Invalid scientific notation
+            self.make_error_test("Float Invalid Scientific No Exponent",
+                            "3.14e",
+                            "Invalid float literal: missing exponent value.")
+            self.make_error_test("Float Invalid Scientific Double E",
+                            "3.14e10e5",
+                            "Invalid float literal: unexpected 'e' in float.")
+            self.make_error_test("Float Invalid Scientific Invalid Exponent",
+                            "3.14eX",
+                            "Invalid float literal: unexpected 'X' in float.")
+
+        # Invalid type annotations
+        self.make_error_test("Float Invalid Type Annotation",
+                           "3.14:i32",
+                           "Invalid float type: must be of type 'f64' or 'f32'.")
+        self.make_error_test("Float Invalid Type Name",
+                           "3.14:f16",
+                           "Invalid float type: must be of type 'f64' or 'f32'.")
+
+        # Comma separators not allowed
+        self.make_error_test("Float Invalid Comma Separator",
+                           "1,234.56",
+                           "Invalid decimal literal: unexpected ',' in decimal integer.")
+
+    def generate_whitespace_tests(self):
+        """Generate tests with whitespace."""
+        self.make_success_test("Float Default Leading Whitespace",
+                              "  3.14", "f64", 3.14)
+        self.make_success_test("Float Default Trailing Whitespace",
+                              "3.14  ", "f64", 3.14)
+        self.make_success_test("Float Default Both Whitespace",
+                              "  3.14  ", "f64", 3.14)
+        self.make_success_test("Float f32 With Whitespace",
+                              "  2.718:f32  ", "f32", 2.718)
+
+    def generate_mathematical_constants_tests(self):
+        """Generate tests for common mathematical constants."""
+        # Pi
+        self.make_success_test("Float Default Pi Approximate",
+                              "3.141592653589793", "f64", 3.141592653589793)
+        self.make_success_test("Float f32 Pi Approximate",
+                              "3.1415927:f32", "f32", 3.1415927)
+
+        # Euler's number
+        self.make_success_test("Float Default Euler Approximate",
+                              "2.718281828459045", "f64", 2.718281828459045)
+        self.make_success_test("Float f32 Euler Approximate",
+                              "2.7182817:f32", "f32", 2.7182817)
+
+        # Golden ratio
+        self.make_success_test("Float Default Golden Ratio",
+                              "1.618033988749895", "f64", 1.618033988749895)
+
+        # Square root of 2
+        self.make_success_test("Float Default Sqrt2",
+                              "1.4142135623730951", "f64", 1.4142135623730951)
+
+    def generate_signed_zero_tests(self):
+        """Generate tests for signed zeros."""
+        self.make_success_test("Float Default Positive Zero", "0.0", "f64", 0.0)
+        self.make_success_test("Float Default Negative Zero", "-0.0", "f64", -0.0)
+        self.make_success_test("Float f32 Positive Zero", "0.0:f32", "f32", 0.0)
+        self.make_success_test("Float f32 Negative Zero", "-0.0:f32", "f32", -0.0)
+
+        # Note: In IEEE 754, +0.0 and -0.0 are distinct values but compare equal
+
+    def generate_all_tests(self) -> List[Dict[str, Any]]:
+        """Generate all test cases."""
+        # Basic tests
+        self.generate_basic_tests()
+
+        # Format variations
+        self.generate_format_tests()
+
+        # Underscores
+        self.generate_underscore_tests()
+
+        # Special values (inf, nan)
+        # self.generate_special_value_tests()
+
+        # Edge cases for each type
+        for type_name in ['f32', 'f64']:
+            self.generate_edge_case_tests(type_name)
+
+        # Overflow tests
+        self.generate_overflow_tests()
+
+        # Precision tests
+        self.generate_precision_tests()
+
+        # Error tests
+        self.generate_error_tests()
+
+        # Whitespace tests
+        self.generate_whitespace_tests()
+
+        # Mathematical constants
+        self.generate_mathematical_constants_tests()
+
+        # Signed zeros
+        self.generate_signed_zero_tests()
+
+        return self.tests

SLS_Tests/generate_tests/general_tests.py

@@ -0,0 +1,11 @@
+from typing import List, Dict, Any
+from .base_tests import BaseTestGenerator
+
+class GeneralTestGenerator(BaseTestGenerator):
+
+    def generate_all_tests(self) -> List[Dict[str, Any]]:
+        """Generate all test cases."""
+
+        self.add_test("Empty_Statement", "", [], [], [])
+
+        return self.tests

SLS_Tests/generate_tests/idents_and_bools_tests.py

@@ -0,0 +1,375 @@
+from typing import List, Dict, Any
+from .base_tests import BaseTestGenerator
+
+
+class IdentifierTestGenerator(BaseTestGenerator):
+    """Generate test cases for identifiers and identifier literals."""
+    
+    # Reserved words that might be operators or keywords
+    RESERVED_WORDS = [
+        'if', 'while', 'for', 'match', 'break', 'continue',
+        'fn', 'struct', 'union', 'enum', 'trait', 'impl', 'inher',
+        'dup', 'drop', 'swap', 'over', 'rot', 'pick', 'roll', 'depth',
+    ]
+    
+    def generate_basic_identifier_tests(self):
+        """Generate basic identifier tests."""
+        # Simple identifiers
+        self.make_success_test("Identifier Simple Lowercase", "hello", 
+                              "identifier", "hello")
+        self.make_success_test("Identifier Simple Uppercase", "HELLO",
+                              "identifier", "HELLO")
+        self.make_success_test("Identifier Mixed Case", "HelloWorld",
+                              "identifier", "HelloWorld")
+        self.make_success_test("Identifier Single Letter", "x",
+                              "identifier", "x")
+        self.make_success_test("Identifier Single Letter Upper", "X",
+                              "identifier", "X")
+        
+        # Identifiers with numbers
+        self.make_success_test("Identifier With Numbers", "var123",
+                              "identifier", "var123")
+        self.make_success_test("Identifier Numbers End", "myVar2",
+                              "identifier", "myVar2")
+        self.make_success_test("Identifier Mixed Numbers", "a1b2c3",
+                              "identifier", "a1b2c3")
+        
+        # Identifiers with underscores
+        self.make_success_test("Identifier With Underscore", "hello_world",
+                              "identifier", "hello_world")
+        self.make_success_test("Identifier Leading Underscore", "_private",
+                              "identifier", "_private")
+        self.make_success_test("Identifier Multiple Underscores", "my_long_var_name",
+                              "identifier", "my_long_var_name")
+        self.make_success_test("Identifier Double Underscore", "my__var",
+                              "identifier", "my__var")
+        self.make_success_test("Identifier Trailing Underscore", "var_",
+                              "identifier", "var_")
+        self.make_success_test("Identifier Only Underscores", "___",
+                              "identifier", "___")
+        
+        # Snake case
+        self.make_success_test("Identifier Snake Case", "my_variable_name",
+                              "identifier", "my_variable_name")
+        
+        # Camel case
+        self.make_success_test("Identifier Camel Case", "myVariableName",
+                              "identifier", "myVariableName")
+        
+        # Pascal case
+        self.make_success_test("Identifier Pascal Case", "MyClassName",
+                              "identifier", "MyClassName")
+        
+        # All caps with underscores
+        self.make_success_test("Identifier All Caps", "MY_CONSTANT",
+                              "identifier", "MY_CONSTANT")
+        
+        # Others
+        self.make_success_test("Identifier With Dash", "my-var",
+                              "identifier", "my-var")
+    
+    def generate_identifier_literal_tests(self):
+        """Generate identifier literal tests (with :: prefix)."""
+        # Simple identifier literals
+        self.make_success_test("Identifier Literal Simple", "::hello",
+                              "identifier_literal", "hello")
+        self.make_success_test("Identifier Literal Uppercase", "::Point",
+                              "identifier_literal", "Point")
+        self.make_success_test("Identifier Literal Snake Case", "::my_var",
+                              "identifier_literal", "my_var")
+        
+        # Type names
+        self.make_success_test("Identifier Literal Type i64", "::i64",
+                              "identifier_literal", "i64")
+        self.make_success_test("Identifier Literal Type String", "::String",
+                              "identifier_literal", "String")
+        self.make_success_test("Identifier Literal Type Point", "::Point",
+                              "identifier_literal", "Point")
+        
+        # Trait names
+        self.make_success_test("Identifier Literal Trait Addable", "::Addable",
+                              "identifier_literal", "Addable")
+        self.make_success_test("Identifier Literal Trait Drawable", "::Drawable",
+                              "identifier_literal", "Drawable")
+        
+        # Field names
+        self.make_success_test("Identifier Literal Field x", "::x",
+                              "identifier_literal", "x")
+        self.make_success_test("Identifier Literal Field width", "::width",
+                              "identifier_literal", "width")
+        
+        # With underscores
+        self.make_success_test("Identifier Literal With Underscore", "::_private",
+                              "identifier_literal", "_private")
+        self.make_success_test("Identifier Literal Multiple Underscores", "::my_long_name",
+                              "identifier_literal", "my_long_name")
+        
+        # With numbers
+        self.make_success_test("Identifier Literal With Numbers", "::var123",
+                              "identifier_literal", "var123")
+    
+    def generate_whitespace_tests(self):
+        """Generate tests with whitespace around identifiers."""
+        # Regular identifiers with whitespace
+        self.make_success_test("Identifier Leading Whitespace", "  hello",
+                              "identifier", "hello")
+        self.make_success_test("Identifier Trailing Whitespace", "hello  ",
+                              "identifier", "hello")
+        self.make_success_test("Identifier Both Whitespace", "  hello  ",
+                              "identifier", "hello")
+        self.make_success_test("Identifier Tab Before", "\\thello",
+                              "identifier", "hello")
+        
+        # Identifier literals with whitespace
+        self.make_success_test("Identifier Literal Leading Whitespace", "  ::hello",
+                              "identifier_literal", "hello")
+        self.make_success_test("Identifier Literal Trailing Whitespace", "::hello  ",
+                              "identifier_literal", "hello")
+        self.make_success_test("Identifier Literal Both Whitespace", "  ::hello  ",
+                              "identifier_literal", "hello")
+    
+    def generate_long_identifier_tests(self):
+        """Generate tests for longer identifiers."""
+        # Moderately long
+        self.make_success_test("Identifier Moderate Length",
+                              "thisIsAReasonablyLongVariableName",
+                              "identifier", "thisIsAReasonablyLongVariableName")
+        
+        # Very long
+        long_name = "this_is_a_very_long_identifier_name_that_someone_might_use_for_some_reason"
+        self.make_success_test("Identifier Very Long", long_name,
+                              "identifier", long_name)
+        
+        # Long with numbers
+        long_with_nums = "variable_with_many_numbers_123_456_789_000"
+        self.make_success_test("Identifier Long With Numbers", long_with_nums,
+                              "identifier", long_with_nums)
+    
+    def generate_error_tests(self):
+        """Generate error test cases for identifiers."""
+        # Starting with number
+        self.make_error_test("Identifier Starting With Number",
+                           "123abc",
+                           "Invalid decimal literal: unexpected 'a' in decimal integer.")
+        
+        # Invalid characters
+        self.make_success_test("Identifier With Octothorpe", "my#var",
+                           "identifier", "my")
+        
+        # self.make_error_test("Identifier With Space",
+        #                    "my var",
+        #                    "Invalid identifier: whitespace not allowed in identifiers.")
+        
+        self.make_error_test("Identifier With Colon",
+                           "my:var",
+                           "Invalid identifier: ':' is not allowed in identifiers.")
+        
+        # Note: :: is allowed only as prefix for identifier literals
+        self.make_error_test("Identifier Double Colon Inside",
+                           "my::var",
+                           "Invalid identifier: ':' is not allowed in identifiers.")
+        
+        # Special characters
+        # self.make_error_test("Identifier With At",
+        #                    "@variable",
+        #                    "Invalid identifier: '@' is not allowed in identifiers.")
+        
+        # self.make_error_test("Identifier With Dollar",
+        #                    "$variable",
+        #                    "Invalid identifier: '$' is not allowed in identifiers.")
+        
+        # self.make_error_test("Identifier With Percent",
+        #                    "%variable",
+        #                    "Invalid identifier: '%' is not allowed in identifiers.")
+        
+        # Brackets not allowed
+        # self.make_error_test("Identifier With Brackets",
+        #                    "my[var]",
+        #                    "Invalid identifier: brackets not allowed in identifiers.")
+        
+        # self.make_error_test("Identifier With Braces",
+        #                    "my{var}",
+        #                    "Invalid identifier: braces not allowed in identifiers.")
+        
+        # self.make_error_test("Identifier With Parens",
+        #                    "my(var)",
+        #                    "Invalid identifier: parentheses not allowed in identifiers.")
+        
+        # Quotes not allowed
+        # self.make_error_test("Identifier With Single Quote",
+        #                    "my'var",
+        #                    "Invalid identifier: quotes not allowed in identifiers.")
+        
+        # self.make_error_test("Identifier With Double Quote",
+        #                    'my"var',
+        #                    "Invalid identifier: quotes not allowed in identifiers.")
+        
+        # Only numbers (not valid identifier)
+        self.make_success_test("Identifier Only Numbers", "123", "i64", 123)
+        
+        # Empty identifier literal
+        self.make_error_test("Identifier Literal Empty",
+                           "::",
+                           "Invalid identifier literal: empty identifier after '::'.")
+    
+    def generate_case_sensitivity_tests(self):
+        """Generate tests showing case sensitivity."""
+        # These should all be different identifiers
+        self.make_success_test("Identifier Case Lower", "variable",
+                              "identifier", "variable")
+        self.make_success_test("Identifier Case Upper", "VARIABLE",
+                              "identifier", "VARIABLE")
+        self.make_success_test("Identifier Case Mixed", "Variable",
+                              "identifier", "Variable")
+        self.make_success_test("Identifier Case Camel", "variableName",
+                              "identifier", "variableName")
+        self.make_success_test("Identifier Case Pascal", "VariableName",
+                              "identifier", "VariableName")
+    
+    def generate_reserved_word_tests(self):
+        """Generate tests for words that might be reserved."""
+        # Note: In the spec, these are treated as identifiers/operators
+        # This tests that they're recognized correctly
+        for word in self.RESERVED_WORDS:
+            self.make_success_test(f"Identifier Reserved Word {word}",
+                                  word, "identifier", word)
+    
+    def generate_all_tests(self) -> List[Dict[str, Any]]:
+        """Generate all identifier test cases."""
+        # Basic identifiers
+        self.generate_basic_identifier_tests()
+        
+        # Identifier literals
+        self.generate_identifier_literal_tests()
+        
+        # Whitespace handling
+        self.generate_whitespace_tests()
+        
+        # Long identifiers
+        self.generate_long_identifier_tests()
+        
+        # Error cases
+        self.generate_error_tests()
+        
+        # Case sensitivity
+        self.generate_case_sensitivity_tests()
+        
+        # Reserved words
+        self.generate_reserved_word_tests()
+        
+        return self.get_tests()
+
+
+class BooleanTestGenerator(BaseTestGenerator):
+    """Generate test cases for boolean literals."""
+    
+    def generate_basic_tests(self):
+        """Generate basic boolean literal tests."""
+        # True
+        self.make_success_test("Bool True", "true", "bool", True)
+        
+        # False
+        self.make_success_test("Bool False", "false", "bool", False)
+    
+    def generate_whitespace_tests(self):
+        """Generate tests with whitespace around booleans."""
+        # True with whitespace
+        self.make_success_test("Bool True Leading Whitespace", "  true",
+                              "bool", True)
+        self.make_success_test("Bool True Trailing Whitespace", "true  ",
+                              "bool", True)
+        self.make_success_test("Bool True Both Whitespace", "  true  ",
+                              "bool", True)
+        self.make_success_test("Bool True Tab Before", "\\ttrue",
+                              "bool", True)
+        
+        # False with whitespace
+        self.make_success_test("Bool False Leading Whitespace", "  false",
+                              "bool", False)
+        self.make_success_test("Bool False Trailing Whitespace", "false  ",
+                              "bool", False)
+        self.make_success_test("Bool False Both Whitespace", "  false  ",
+                              "bool", False)
+        self.make_success_test("Bool False Tab Before", "\\tfalse",
+                              "bool", False)
+    
+    def generate_error_tests(self):
+        """Generate error test cases for booleans."""
+        # Capitalized (case sensitive)
+        self.make_success_test("Bool True Capitalized", "True",
+                           "identifier", "True")
+        
+        self.make_success_test("Bool False Capitalized", "False",
+                           "identifier", "False")
+        
+        # All caps
+        self.make_success_test("Bool True All Caps", "TRUE",
+                           "identifier", "TRUE")
+        
+        self.make_success_test("Bool False All Caps", "FALSE",
+                           "identifier", "FALSE")
+        
+        # Mixed case
+        self.make_success_test("Bool True Mixed Case", "tRuE",
+                           "identifier", "tRuE")
+        
+        self.make_success_test("Bool False Mixed Case", "fAlSe",
+                           "identifier", "fAlSe")
+        
+        # Numeric representations
+        self.make_success_test("Bool Numeric 1", "1", "i64", 1)
+        
+        self.make_success_test("Bool Numeric 0", "0", "i64", 0)
+        
+        # String representations
+        if self.ENABLE_STRINGS:
+            self.make_success_test("Bool String True", '"true"',
+                            "string", "true")
+            
+            self.make_success_test("Bool String False", '"false"',
+                            "string", "false")
+        
+        # Other languages
+        self.make_success_test("Bool Yes", "yes",
+                           "identifier", "yes")
+        
+        self.make_success_test("Bool No", "no",
+                           "identifier", "no")
+        
+        # Typos
+        self.make_success_test("Bool Typo Ture", "ture",
+                           "identifier", "ture")
+        
+        self.make_success_test("Bool Typo Flase", "flase",
+                           "identifier", "flase")
+    
+    def generate_multiple_bool_tests(self):
+        """Generate tests with multiple boolean values."""
+        # Multiple values on stack
+        self.make_multi_value_test("Bool Multiple True False",
+                                   "true false",
+                                   [("bool", True), ("bool", False)])
+        
+        self.make_multi_value_test("Bool Multiple Same",
+                                   "true true",
+                                   [("bool", True), ("bool", True)])
+        
+        self.make_multi_value_test("Bool Three Values",
+                                   "true false true",
+                                   [("bool", True), ("bool", False), ("bool", True)])
+    
+    def generate_all_tests(self) -> List[Dict[str, Any]]:
+        """Generate all boolean test cases."""
+        # Basic tests
+        self.generate_basic_tests()
+        
+        # Whitespace handling
+        self.generate_whitespace_tests()
+        
+        # Error cases
+        self.generate_error_tests()
+        
+        # Multiple booleans
+        self.generate_multiple_bool_tests()
+        
+        return self.get_tests()

SLS_Tests/generate_tests/integer_tests.py

@@ -0,0 +1,225 @@
+from typing import List, Dict, Any
+from .base_tests import BaseTestGenerator
+
+class IntegerTestGenerator(BaseTestGenerator):
+    """Generate test cases for integer literals."""
+
+    # Type ranges
+    TYPE_RANGES = {
+        'i8': (-128, 127),
+        'i16': (-32768, 32767),
+        'i32': (-2147483648, 2147483647),
+        'i64': (-9223372036854775808, 9223372036854775807),
+        'u8': (0, 255),
+        'u16': (0, 65535),
+        'u32': (0, 4294967295),
+        'u64': (0, 18446744073709551615),
+    }
+
+    TYPE_VALUES = {
+        'i8': (-128, 127),
+        'i16': (-32768, 32767),
+        'i32': (-2147483648, 2147483647),
+        'i64': ("INT64_MIN", 9223372036854775807),
+        'u8': (0, 255),
+        'u16': (0, 65535),
+        'u32': (0, 4294967295),
+        'u64': (0, "UINT64_MAX"),
+    }
+
+    def generate_basic_tests(self):
+        """Generate basic test cases."""
+
+        # Simple default integers
+        self.make_success_test("Integer Default Decimal 0", "0", "i64", 0)
+        self.make_success_test("Integer Default Decimal -1", "-1", "i64", -1)
+        self.make_success_test("Integer Default Decimal 42", "42", "i64", 42)
+        self.make_success_test("Integer Default Decimal Leading Zeros", "00042", "i64", 42)
+
+    def generate_default_base_tests(self):
+        """Generate tests for default type with different bases."""
+        # Hexadecimal
+        self.make_success_test("Integer Default Hex 0xFF", "0xFF", "i64", 255)
+        self.make_success_test("Integer Default Hex 0xdeadbeef", "0xdeadbeef", "i64", 3735928559)
+        self.make_success_test("Integer Default Hex Max", "0x7FFFFFFFFFFFFFFF", "i64", 9223372036854775807)
+
+        # Binary
+        self.make_success_test("Integer Default Binary 0b1010", "0b1010", "i64", 10)
+        self.make_success_test("Integer Default Binary All Ones", "0b1111111111111111", "i64", 65535)
+
+        # Octal
+        self.make_success_test("Integer Default Octal 0o755", "0o755", "i64", 493)
+        self.make_success_test("Integer Default Octal Max Three Digits", "0o777", "i64", 511)
+
+    def generate_default_edge_cases(self):
+        """Generate edge case tests for default type."""
+        # Min/max values
+        self.make_success_test("Integer Default Decimal Max i64",
+                              "9223372036854775807", "i64", 9223372036854775807)
+        self.make_success_test("Integer Default Decimal Min i64",
+                              "-9223372036854775808", "i64", "INT64_MIN")
+
+        # Underscores
+        self.make_success_test("Integer Default Decimal with Underscore",
+                              "1_000_000", "i64", 1000000)
+        self.make_success_test("Integer Default Underscore End", "42_", "i64", 42)
+        self.make_success_test("Integer Default Underscore Double", "4__2", "i64", 42)
+
+        # Whitespace
+        self.make_success_test("Integer Default Whitespace", "  42  ", "i64", 42)
+
+        # Zeros in different bases
+        self.make_success_test("Integer Default Hex Zero", "0x0", "i64", 0)
+        self.make_success_test("Integer Default Binary Zero", "0b0", "i64", 0)
+        self.make_success_test("Integer Default Octal Zero", "0o0", "i64", 0)
+
+    def generate_default_error_tests(self):
+        """Generate error tests for default type."""
+        self.make_error_test("Integer Default Decimal with Commas Invalid",
+                           "1,000,000",
+                           "Invalid decimal literal: unexpected ',' in decimal integer.")
+        self.make_error_test("Integer Default Invalid Characters",
+                           "12a3",
+                           "Invalid decimal literal: unexpected 'a' in decimal integer.")
+        self.make_error_test("Integer Default Invalid Prefix",
+                           "0b2",
+                           "Invalid binary literal: unexpected '2' in binary integer.")
+
+    def generate_typed_tests(self, type_name: str):
+        """Generate tests for a specific type across all bases."""
+        min_range, max_range = self.TYPE_RANGES[type_name]
+        min_value, max_value = self.TYPE_VALUES[type_name]
+        is_unsigned = type_name.startswith('u')
+
+        # Basic decimal
+        test_val = 42 if max_range >= 42 else max_range
+        self.make_success_test(f"Integer {type_name} Decimal Positive",
+                              f"{test_val}:{type_name}", type_name, test_val)
+
+        # Zero
+        self.make_success_test(f"Integer {type_name} Zero",
+                              f"0:{type_name}", type_name, 0)
+
+        # Negative (only for signed types)
+        if not is_unsigned:
+            neg_val = -100 if min_range <= -100 else min_range
+            self.make_success_test(f"Integer {type_name} Decimal Negative",
+                                  f"{neg_val}:{type_name}", type_name, neg_val)
+
+        # Hexadecimal
+        hex_val = min(255, max_range)
+        self.make_success_test(f"Integer {type_name} Hex",
+                              f"0x{hex_val:X}:{type_name}", type_name, hex_val)
+
+        # Binary
+        bin_val = min(15, max_range)
+        self.make_success_test(f"Integer {type_name} Binary",
+                              f"0b{bin_val:b}:{type_name}", type_name, bin_val)
+
+        # Octal
+        oct_val = min(63, max_range)
+        self.make_success_test(f"Integer {type_name} Octal",
+                              f"0o{oct_val:o}:{type_name}", type_name, oct_val)
+
+        # Max value
+        self.make_success_test(f"Integer {type_name} Max Value",
+                              f"{max_range}:{type_name}", type_name, max_value)
+
+        # Min value
+        self.make_success_test(f"Integer {type_name} Min Value",
+                              f"{min_range}:{type_name}", type_name, min_value)
+
+        # Overflow
+        overflow_val = max_range + 1
+        self.make_error_test(f"Integer {type_name} Overflow",
+                           f"{overflow_val}:{type_name}",
+                           f"Integer overflow: value exceeds range for {type_name}.")
+
+        # Underflow
+        underflow_val = min_range - 1
+        self.make_error_test(f"Integer {type_name} Underflow",
+                           f"{underflow_val}:{type_name}",
+                           f"Integer overflow: value exceeds range for {type_name}.")
+
+        # Underscores with type annotation
+        if max_range >= 1000000:
+            self.make_success_test(f"Integer {type_name} With Underscores",
+                                  f"1_000_000:{type_name}", type_name, 1000000)
+
+    def generate_special_typed_tests(self):
+        """Generate special tests for specific types."""
+
+        # Special values for specific types
+        self.make_success_test("Integer i8 Hex Max", "0x7F:i8", "i8", 127)
+        self.make_success_test("Integer i8 Binary Max", "0b01111111:i8", "i8", 127)
+        self.make_success_test("Integer i8 Octal Max", "0o177:i8", "i8", 127)
+        self.make_success_test("Integer i8 Negative Hex", "-0x80:i8", "i8", -128)
+
+        self.make_success_test("Integer u8 Hex Max", "0xFF:u8", "u8", 255)
+        self.make_success_test("Integer u8 Binary Max", "0b11111111:u8", "u8", 255)
+        self.make_success_test("Integer u8 Octal Max", "0o377:u8", "u8", 255)
+
+        self.make_success_test("Integer i16 Hex Sample", "0x1234:i16", "i16", 4660)
+        self.make_success_test("Integer i16 Binary Sample",
+                                "0b1111111100000000:i16", "i16", -256)
+        self.make_success_test("Integer i16 Octal Sample", "0o1234:i16", "i16", 668)
+
+        self.make_success_test("Integer u16 Hex Max", "0xFFFF:u16", "u16", 65535)
+        self.make_success_test("Integer u16 Binary Max",
+                                "0b1111111111111111:u16", "u16", 65535)
+        self.make_success_test("Integer u16 Octal Max", "0o177777:u16", "u16", 65535)
+        self.make_success_test("Integer u16 Decimal Mid", "50000:u16", "u16", 50000)
+
+        self.make_success_test("Integer i32 Hex Sample", "0xABCD:i32", "i32", 43981)
+        self.make_success_test("Integer i32 Binary Sample",
+                                "0b11110000:i32", "i32", 240)
+
+        self.make_success_test("Integer u32 Hex Max", "0xFFFFFFFF:u32", "u32", 4294967295)
+        self.make_success_test("Integer u32 Binary Sample",
+                                "0b11111111000000001111111100000000:u32",
+                                "u32", 4278255360)
+        self.make_success_test("Integer u32 Octal Max",
+                                "0o37777777777:u32", "u32", 4294967295)
+        self.make_success_test("Integer u32 Decimal Mid", "1000000:u32", "u32", 1000000)
+
+        self.make_success_test("Integer i64 Decimal Positive 42", "42:i64", "i64", 42)
+        self.make_success_test("Integer i64 Hex 0xFF", "0xFF:i64", "i64", 255)
+        self.make_success_test("Integer i64 Binary 0b1010", "0b1010:i64", "i64", 10)
+        self.make_success_test("Integer i64 Octal 0o755", "0o755:i64", "i64", 493)
+
+        self.make_success_test("Integer u64 Hex Max",
+                                "0xFFFFFFFFFFFFFFFF:u64",
+                                "u64", "UINT64_MAX")
+        self.make_success_test("Integer u64 Binary Sample",
+                                "0b1010101010101010:u64", "u64", 43690)
+        self.make_success_test("Integer u64 Octal Sample", "0o7777:u64", "u64", 4095)
+        self.make_success_test("Integer u64 Decimal", "42:u64", "u64", 42)
+
+    def generate_underscore_tests(self):
+        """Generate tests for underscores in different bases."""
+        self.make_success_test("Integer Hex With Underscores",
+                              "0xDEAD_BEEF:i64", "i64", 3735928559)
+        self.make_success_test("Integer Binary With Underscores",
+                              "0b1111_0000_1010_0101:i32", "i32", 61605)
+        self.make_success_test("Integer Octal With Underscores",
+                              "0o7_7_7:i16", "i16", 511)
+
+    def generate_all_tests(self) -> List[Dict[str, Any]]:
+        """Generate all test cases."""
+        # Basic tests
+        self.generate_basic_tests()
+
+        # Default type (i64) comprehensive tests
+        self.generate_default_base_tests()
+        self.generate_default_edge_cases()
+        self.generate_default_error_tests()
+
+        # Tests for each specific type
+        for type_name in ['i8', 'i16', 'i32', 'i64', 'u8', 'u16', 'u32', 'u64']:
+            self.generate_typed_tests(type_name)
+        self.generate_special_typed_tests()
+
+        # Additional edge cases
+        self.generate_underscore_tests()
+
+        return self.tests

SLS_Tests/generate_tests/string_tests.py

@@ -0,0 +1,477 @@
+from typing import List, Dict, Any
+from .base_tests import BaseTestGenerator
+
+
+class StringTestGenerator(BaseTestGenerator):
+    """Generate test cases for string literals."""
+    
+    # Common escape sequences
+    ESCAPE_SEQUENCES = {
+        '\\n': '\n',    # Newline
+        '\\r': '\r',    # Carriage return
+        '\\t': '\t',    # Tab
+        '\\\\': '\\',   # Backslash
+        '\\"': '"',     # Double quote
+        "\\'": "'",     # Single quote
+        '\\0': '\0',    # Null character
+    }
+    
+    def generate_basic_tests(self):
+        """Generate basic string literal tests."""
+        # Empty string
+        self.make_success_test("String Empty", '""', "string", "")
+        
+        # Simple strings
+        self.make_success_test("String Simple", '"hello"', "string", "hello")
+        self.make_success_test("String With Space", '"hello world"', "string", "hello world")
+        self.make_success_test("String Single Char", '"A"', "string", "A")
+        
+        # Multiple words
+        self.make_success_test("String Multiple Words", 
+                              '"The quick brown fox"', "string", "The quick brown fox")
+        
+        # Numbers in strings
+        self.make_success_test("String With Numbers", '"abc123"', "string", "abc123")
+        self.make_success_test("String Only Numbers", '"12345"', "string", "12345")
+        
+        # Mixed case
+        self.make_success_test("String Mixed Case", '"HeLLo WoRLd"', "string", "HeLLo WoRLd")
+        
+        # Special characters
+        self.make_success_test("String With Punctuation", 
+                              '"Hello, World!"', "string", "Hello, World!")
+        self.make_success_test("String With Symbols", 
+                              '"@#$%^&*()"', "string", "@#$%^&*()")
+        
+        # Spaces
+        self.make_success_test("String Multiple Spaces", 
+                              '"hello     world"', "string", "hello     world")
+        self.make_success_test("String Leading Space", '" hello"', "string", " hello")
+        self.make_success_test("String Trailing Space", '"hello "', "string", "hello ")
+        self.make_success_test("String Only Spaces", '"   "', "string", "   ")
+    
+    def generate_escape_sequence_tests(self):
+        """Generate tests for escape sequences."""
+        # Individual escape sequences
+        self.make_success_test("String Newline", '"hello\\nworld"', 
+                              "string", "hello\\nworld")
+        self.make_success_test("String Tab", '"hello\\tworld"', 
+                              "string", "hello\\tworld")
+        self.make_success_test("String Carriage Return", '"hello\\rworld"', 
+                              "string", "hello\\rworld")
+        self.make_success_test("String Backslash", '"hello\\\\world"', 
+                              "string", "hello\\\\world")
+        self.make_success_test("String Double Quote", '"say \\\\"hello\\\\""', 
+                              "string", 'say \\"hello\\"')
+        self.make_success_test("String Single Quote", '"it\\\'s"', 
+                              "string", "it's")
+        self.make_success_test("String Null Char", '"hello\\0world"', 
+                              "string", "hello\\0world")
+        
+        # Multiple escape sequences
+        self.make_success_test("String Multiple Escapes", 
+                              '"line1\\nline2\\nline3"', 
+                              "string", "line1\\nline2\\nline3")
+        self.make_success_test("String Mixed Escapes", 
+                              '"tab\\there\\nnewline\\\\backslash"',
+                              "string", "tab\\there\\nnewline\\\\backslash")
+        
+        # Escape at start/end
+        self.make_success_test("String Escape At Start", '"\\nhello"', 
+                              "string", "\\nhello")
+        self.make_success_test("String Escape At End", '"hello\\n"', 
+                              "string", "hello\\n")
+        
+        # Consecutive escapes
+        self.make_success_test("String Consecutive Escapes", '"\\n\\n\\n"', 
+                              "string", "\\n\\n\\n")
+        self.make_success_test("String All Escapes", '"\\n\\r\\t\\\\"\\\'\\0"',
+                              "string", "\\n\\r\\t\\\\\\\"\\'\\0")
+    
+    def generate_hexadecimal_escape_tests(self):
+        """Generate tests for hexadecimal escape sequences."""
+        # Basic hex escapes
+        self.make_success_test("String Hex Letter A", '"\\x41"', "string", "A")
+        self.make_success_test("String Hex Letter a", '"\\x61"', "string", "a")
+        self.make_success_test("String Hex Space", '"\\x20"', "string", " ")
+        self.make_success_test("String Hex Tab", '"\\x09"', "string", "\\t")
+        self.make_success_test("String Hex Newline", '"\\x0A"', "string", "\\n")
+        
+        # Multiple hex escapes
+        self.make_success_test("String Multiple Hex", '"\\x48\\x65\\x6C\\x6C\\x6F"',
+                              "string", "Hello")
+        
+        # Hex with regular text
+        self.make_success_test("String Hex Mixed", '"Hello\\x20World"', 
+                              "string", "Hello World")
+        
+        # Extended ASCII
+        self.make_success_test("String Hex Extended ASCII", '"\\xA9\\xAE"',
+                              "string", "\xA9\xAE")
+        
+        # Case variations
+        self.make_success_test("String Hex Uppercase", '"\\xFF"', "string", "\\xFF")
+        self.make_success_test("String Hex Lowercase", '"\\xff"', "string", "\\xff")
+        self.make_success_test("String Hex Mixed Case", '"\\xAb"', "string", "\\xAb")
+        
+        # All hex values
+        self.make_success_test("String Hex Zero", '"\\x00"', "string", "\\0")
+        self.make_success_test("String Hex Max", '"\\xFF"', "string", "\\xFF")
+    
+    def generate_unicode_escape_tests(self):
+        """Generate tests for Unicode escape sequences."""
+        # Basic Unicode escapes
+        self.make_success_test("String Unicode Letter A", '"\\u{41}"', "string", "A")
+        self.make_success_test("String Unicode Space", '"\\u{20}"', "string", " ")
+        
+        # Emoji
+        self.make_success_test("String Unicode Smiley", '"\\u{1F600}"', 
+                              "string", "😀")
+        self.make_success_test("String Unicode Heart", '"\\u{2764}"', 
+                              "string", "❤")
+        self.make_success_test("String Unicode Star", '"\\u{2B50}"', 
+                              "string", "⭐")
+        
+        # Multiple emoji
+        self.make_success_test("String Multiple Emoji", 
+                              '"\\u{1F600}\\u{2764}\\u{2B50}"',
+                              "string", "😀❤⭐")
+        
+        # Greek letters
+        self.make_success_test("String Unicode Greek Alpha", '"\\u{03B1}"',
+                              "string", "α")
+        self.make_success_test("String Unicode Greek Beta", '"\\u{03B2}"',
+                              "string", "β")
+        
+        # Chinese characters
+        self.make_success_test("String Unicode Chinese", '"\\u{4E2D}\\u{6587}"',
+                              "string", "中文")
+        
+        # Arabic
+        self.make_success_test("String Unicode Arabic", '"\\u{0639}\\u{0631}\\u{0628}"',
+                              "string", "عرب")
+        
+        # Cyrillic
+        self.make_success_test("String Unicode Cyrillic", '"\\u{0420}\\u{0443}\\u{0441}"',
+                              "string", "Рус")
+        
+        # Mathematical symbols
+        self.make_success_test("String Unicode Math", '"\\u{221E}\\u{2211}\\u{222B}"',
+                              "string", "∞∑∫")
+        
+        # Mixed with regular text
+        self.make_success_test("String Unicode Mixed", '"Hello \\u{1F600} World"',
+                              "string", "Hello 😀 World")
+        
+        # Case variations in hex digits
+        self.make_success_test("String Unicode Hex Uppercase", '"\\u{1F600}"',
+                              "string", "😀")
+        self.make_success_test("String Unicode Hex Lowercase", '"\\u{1f600}"',
+                              "string", "😀")
+        self.make_success_test("String Unicode Hex Mixed", '"\\u{1F60a}"',
+                              "string", "😊")
+        
+        # Variable length code points
+        self.make_success_test("String Unicode 2 Digits", '"\\u{41}"', "string", "A")
+        self.make_success_test("String Unicode 4 Digits", '"\\u{03B1}"', "string", "α")
+        self.make_success_test("String Unicode 5 Digits", '"\\u{1F600}"', "string", "😀")
+        self.make_success_test("String Unicode 6 Digits", '"\\u{10FFFF}"', 
+                              "string", "\U0010FFFF")
+    
+    def generate_direct_unicode_tests(self):
+        """Generate tests for direct Unicode characters in strings."""
+        # Direct emoji
+        self.make_success_test("String Direct Emoji", '"Hello 😀 World"',
+                              "string", "Hello 😀 World")
+        self.make_success_test("String Multiple Direct Emoji", '"😀❤⭐👍"',
+                              "string", "😀❤⭐👍")
+        
+        # Direct Greek
+        self.make_success_test("String Direct Greek", '"αβγδ"', "string", "αβγδ")
+        
+        # Direct Chinese
+        self.make_success_test("String Direct Chinese", '"你好世界"',
+                              "string", "你好世界")
+        
+        # Direct Arabic
+        self.make_success_test("String Direct Arabic", '"مرحبا"', "string", "مرحبا")
+        
+        # Direct Cyrillic
+        self.make_success_test("String Direct Cyrillic", '"Привет"',
+                              "string", "Привет")
+        
+        # Direct mathematical
+        self.make_success_test("String Direct Math", '"∞∑∫√π"', "string", "∞∑∫√π")
+        
+        # Mixed scripts
+        self.make_success_test("String Mixed Scripts", '"Hello 世界 Привет"',
+                              "string", "Hello 世界 Привет")
+    
+    def generate_multiline_tests(self):
+        """Generate tests for strings with embedded newlines."""
+        # Strings with escape newlines
+        self.make_success_test("String With Escaped Newlines",
+                              '"line1\\nline2\\nline3"',
+                              "string", "line1\\nline2\\nline3")
+        
+        # Paragraph-like text
+        self.make_success_test("String Paragraph",
+                              '"First line.\\nSecond line.\\nThird line."',
+                              "string", "First line.\\nSecond line.\\nThird line.")
+        
+        # Mixed line endings
+        self.make_success_test("String Mixed Line Endings",
+                              '"Windows\\r\\nUnix\\nMac\\r"',
+                              "string", "Windows\\r\\nUnix\\nMac\\r")
+    
+    def generate_whitespace_tests(self):
+        """Generate tests with various whitespace."""
+        # Leading/trailing whitespace outside quotes
+        self.make_success_test("String Leading Whitespace Outside",
+                              '  "hello"', "string", "hello")
+        self.make_success_test("String Trailing Whitespace Outside",
+                              '"hello"  ', "string", "hello")
+        self.make_success_test("String Both Whitespace Outside",
+                              '  "hello"  ', "string", "hello")
+        
+        # Tabs outside quotes
+        self.make_success_test("String Tab Before", '\t"hello"', "string", "hello")
+        
+        # Mixed whitespace
+        self.make_success_test("String Tabs And Newlines Inside",
+                              '"hello\\t\\tworld\\n\\ntest"',
+                              "string", "hello\\t\\tworld\\n\\ntest")
+        
+        # Only whitespace inside
+        self.make_success_test("String Only Tabs", '"\\t\\t\\t"', "string", "\\t\\t\\t")
+        self.make_success_test("String Only Newlines", '"\\n\\n\\n"', "string", "\\n\\n\\n")
+        self.make_success_test("String Mixed Whitespace", '" \\t\\n\\r "',
+                              "string", " \\t\\n\\r ")
+    
+    def generate_long_string_tests(self):
+        """Generate tests for longer strings."""
+        # Sentence
+        self.make_success_test("String Sentence",
+                              '"The quick brown fox jumps over the lazy dog."',
+                              "string", "The quick brown fox jumps over the lazy dog.")
+        
+        # Multiple sentences
+        self.make_success_test("String Multiple Sentences",
+                              '"First sentence. Second sentence. Third sentence."',
+                              "string", "First sentence. Second sentence. Third sentence.")
+        
+        # Long string with escapes
+        long_str = '"This is a long string.\\nIt has multiple lines.\\nAnd some tabs\\there.\\nPlus quotes "like this"."'
+        expected = "This is a long string.\\nIt has multiple lines.\\nAnd some tabs\\there.\\nPlus quotes \\\"like this\\\"."
+        self.make_success_test("String Long With Escapes", long_str,
+                              "string", expected)
+        
+        # Repetitive string
+        self.make_success_test("String Repetitive", '"aaaaaaaaaa"',
+                              "string", "aaaaaaaaaa")
+        
+        # All ASCII printable characters
+        printable = "".join(chr(i) for i in range(32, 127) if chr(i) not in ['"', '\\'])
+        self.make_success_test("String ASCII Printable",
+                              f'"{printable}"', "string", printable)
+    
+    def generate_special_content_tests(self):
+        """Generate tests for strings with special content."""
+        # Code-like strings
+        self.make_success_test("String Code Like",
+                              '"int main() { return 0; }"',
+                              "string", "int main() { return 0; }")
+        
+        # JSON-like strings
+        self.make_success_test("String JSON Like",
+                              '"{{\\\\"key\\\\": \\\\"value\\\\"}}"',
+                              "string", '{\\"key\\": \\"value\\"}')
+        
+        # URL
+        self.make_success_test("String URL",
+                              '"https://example.com/path?query=value"',
+                              "string", "https://example.com/path?query=value")
+        
+        # Email
+        self.make_success_test("String Email",
+                              '"user@example.com"', "string", "user@example.com")
+        
+        # File path (Unix)
+        self.make_success_test("String Unix Path",
+                              '"/home/user/file.txt"',
+                              "string", "/home/user/file.txt")
+        
+        # File path (Windows)
+        self.make_success_test("String Windows Path",
+                              '"C:\\\\Users\\\\file.txt"',
+                              "string", "C:\\\\Users\\\\file.txt")
+        
+        # SQL-like
+        self.make_success_test("String SQL Like",
+                              '"SELECT * FROM users WHERE id = 1"',
+                              "string", "SELECT * FROM users WHERE id = 1")
+        
+        # Regular expression
+        self.make_success_test("String Regex Like",
+                              '"[a-zA-Z0-9]+"', "string", "[a-zA-Z0-9]+")
+    
+    def generate_error_tests(self):
+        """Generate error test cases."""
+        # Unclosed string
+        self.make_error_test("String Unclosed",
+                           '"hello',
+                           "Invalid string literal: unclosed string literal.")
+        
+        # Unescaped newline
+        self.make_error_test("String Unescaped Newline",
+                           '"hello\\nworld"',
+                           "Invalid string literal: unescaped newline in string literal.")
+        
+        # Invalid escape sequence
+        self.make_error_test("String Invalid Escape",
+                           '"hello\\\\qworld"',
+                           "Invalid string literal: unknown escape sequence '\\\\q'.")
+        
+        # Hex escape too short
+        self.make_error_test("String Hex Too Short",
+                           '"\\x4"',
+                           "Invalid string literal: hexadecimal escape must have exactly 2 digits.")
+        
+        # Hex escape too long
+        self.make_error_test("String Hex Too Long",
+                           '"\\\\x414"',
+                           "Invalid string literal: hexadecimal escape must have exactly 2 digits.")
+        
+        # Invalid hex digits
+        self.make_error_test("String Hex Invalid Digit",
+                           '"\\\\xGG"',
+                           "Invalid string literal: invalid hexadecimal digit 'G'.")
+        
+        if self.ENABLE_UNICODE:
+            # Unicode no braces
+            self.make_error_test("String Unicode No Braces",
+                            '"\\u1F600"',
+                            "Invalid string literal: Unicode escape must use braces \\u{...}.")
+            
+            # Unicode empty
+            self.make_error_test("String Unicode Empty",
+                            '"\\u{}"',
+                            "Invalid string literal: empty Unicode escape sequence.")
+            
+            # Unicode too long
+            self.make_error_test("String Unicode Too Long",
+                            '"\\u{1234567}"',
+                            "Invalid string literal: Unicode escape sequence too long (max 6 hex digits).")
+            
+            # Unicode invalid code point (surrogate)
+            self.make_error_test("String Unicode Surrogate",
+                            '"\\u{D800}"',
+                            "Invalid string literal: invalid Unicode code point (surrogate range).")
+            
+            # Unicode out of range
+            self.make_error_test("String Unicode Out Of Range",
+                            '"\\u{110000}"',
+                            "Invalid string literal: Unicode code point out of range (max 0x10FFFF).")
+            
+            # Unicode invalid hex
+            self.make_error_test("String Unicode Invalid Hex",
+                            '"\\u{GGGG}"',
+                            "Invalid string literal: invalid hexadecimal digit 'G' in Unicode escape.")
+            
+            # Unclosed Unicode escape
+            self.make_error_test("String Unicode Unclosed",
+                            '"\\u{1F600"',
+                            "Invalid string literal: unclosed Unicode escape sequence.")
+        
+        # Single quotes instead of double
+        self.make_error_test("String Single Quotes",
+                           "'hello'",
+                           "Invalid string literal: string literals must use double quotes.")
+        
+        # Backslash at end
+        self.make_error_test("String Backslash At End",
+                           '"hello\\\\"',
+                           "Invalid string literal: incomplete escape sequence at end.")
+    
+    def generate_edge_case_tests(self):
+        """Generate edge case tests."""
+        # String with only escape sequences
+        self.make_success_test("String Only Escapes",
+                              '"\\n\\t\\r"', "string", "\\n\\t\\r")
+        
+        # String with null characters
+        self.make_success_test("String With Nulls",
+                              '"a\\0b\\0c"', "string", "a\\0b\\0c")
+        
+        # Very long escape sequence
+        self.make_success_test("String Many Escapes",
+                              '"\\n\\n\\n\\n\\n\\n\\n\\n\\n\\n"',
+                              "string", "\\n\\n\\n\\n\\n\\n\\n\\n\\n\\n")
+        
+        if self.ENABLE_UNICODE:
+            # Mixed escape types
+            self.make_success_test("String All Escape Types",
+                                '"\\n\\x41\\u{42}test"',
+                                "string", "\nABtest")
+            
+            # Zero-width characters
+            self.make_success_test("String Zero Width",
+                                '"hello\\u{200B}world"',
+                                "string", "hello\u200Bworld")
+            
+            # Combining characters
+            self.make_success_test("String Combining",
+                                '"e\\u{0301}"',  # é as e + combining acute
+                                "string", "e\u0301")
+            
+            # Right-to-left
+            self.make_success_test("String RTL Mark",
+                                '"\\u{200F}hello"',
+                                "string", "\u200Fhello")
+            
+            # Byte order mark
+            self.make_success_test("String BOM",
+                                '"\\u{FEFF}hello"',
+                                "string", "\uFEFFhello")
+    
+    def generate_all_tests(self) -> List[Dict[str, Any]]:
+        """Generate all string literal test cases."""
+        
+        if not self.ENABLE_STRINGS:
+            return []
+        
+        # Basic tests
+        self.generate_basic_tests()
+        
+        # Escape sequences
+        self.generate_escape_sequence_tests()
+        
+        # Hexadecimal escapes
+        self.generate_hexadecimal_escape_tests()
+        
+        if self.ENABLE_UNICODE:
+            # Unicode escapes
+            self.generate_unicode_escape_tests()
+            
+            # Direct Unicode
+            self.generate_direct_unicode_tests()
+        
+        # Multiline strings
+        self.generate_multiline_tests()
+        
+        # Whitespace handling
+        self.generate_whitespace_tests()
+        
+        # Long strings
+        self.generate_long_string_tests()
+        
+        # Special content
+        self.generate_special_content_tests()
+        
+        # Error cases
+        self.generate_error_tests()
+        
+        # Edge cases
+        self.generate_edge_case_tests()
+        
+        return self.get_tests()

SLS_Tests/generate_tests/token_strings.py

@@ -0,0 +1,623 @@
+from typing import List, Dict, Any
+from .base_tests import BaseTestGenerator, Token
+
+
+class TokenStringTestGenerator(BaseTestGenerator):
+    """Generate test cases for token strings (unparsed code blocks in braces)."""
+    
+    def generate_basic_tests(self):
+        """Generate basic token string tests."""
+        # Empty token string
+        self.make_token_string_test(
+            "TokenString Empty",
+            "{ }",
+            []
+        )
+        
+        # Single token
+        self.make_token_string_test(
+            "TokenString Single Integer",
+            "{ 42 }",
+            [Token(type="i64", value=42)]
+        )
+        
+        self.make_token_string_test(
+            "TokenString Single Identifier",
+            "{ dup }",
+            [Token(type="identifier", value="dup")]
+        )
+        
+        # Two tokens
+        self.make_token_string_test(
+            "TokenString Two Integers",
+            "{ 2 3 }",
+            [
+                Token(type="i64", value=2),
+                Token(type="i64", value=3)
+            ]
+        )
+        
+        # Simple expression
+        self.make_token_string_test(
+            "TokenString Simple Expression",
+            "{ 2 3 + }",
+            [
+                Token(type="i64", value=2),
+                Token(type="i64", value=3),
+                Token(type="identifier", value="+")
+            ]
+        )
+        
+        # Stack manipulation
+        self.make_token_string_test(
+            "TokenString Stack Ops",
+            "{ dup * }",
+            [
+                Token(type="identifier", value="dup"),
+                Token(type="identifier", value="*")
+            ]
+        )
+    
+    def generate_literal_tests(self):
+        """Generate tests with various literal types inside token strings."""
+        # Integer literals
+        self.make_token_string_test(
+            "TokenString Integer Literals",
+            "{ 0 42 -10 1000 }",
+            [
+                Token(type="i64", value=0),
+                Token(type="i64", value=42),
+                Token(type="i64", value=-10),
+                Token(type="i64", value=1000)
+            ]
+        )
+        
+        # Float literals
+        self.make_token_string_test(
+            "TokenString Float Literals",
+            "{ 3.14 -2.5 0.0 }",
+            [
+                Token(type="f64", value=3.14),
+                Token(type="f64", value=-2.5),
+                Token(type="f64", value=0.0)
+            ]
+        )
+        
+        # String literals
+        if self.ENABLE_STRINGS:
+            self.make_token_string_test(
+                "TokenString String Literal",
+                '{ "hello" }',
+                [Token(type="String", value="hello")]
+            )
+            
+            self.make_token_string_test(
+                "TokenString Multiple Strings",
+                '{ "hello" "world" }',
+                [
+                    Token(type="String", value="hello"),
+                    Token(type="String", value="world")
+                ]
+            )
+        
+        # Character literals
+        self.make_token_string_test(
+            "TokenString Char Literal",
+            "{ 'A' }",
+            [Token(type="char", value='A')]
+        )
+        
+        # Boolean literals
+        self.make_token_string_test(
+            "TokenString Boolean Literals",
+            "{ true false }",
+            [
+                Token(type="bool", value=True),
+                Token(type="bool", value=False)
+            ]
+        )
+        
+        # Mixed literals
+        if self.ENABLE_STRINGS:
+            self.make_token_string_test(
+                "TokenString Mixed Literals",
+                '{ 42 3.14 "hello" true \'A\' }',
+                [
+                    Token(type="i64", value=42),
+                    Token(type="f64", value=3.14),
+                    Token(type="String", value="hello"),
+                    Token(type="bool", value=True),
+                    Token(type="char", value='A')
+                ]
+            )
+    
+    def generate_identifier_tests(self):
+        """Generate tests with various identifiers inside token strings."""
+        # Multiple identifiers
+        self.make_token_string_test(
+            "TokenString Multiple Identifiers",
+            "{ dup swap over }",
+            [
+                Token(type="identifier", value="dup"),
+                Token(type="identifier", value="swap"),
+                Token(type="identifier", value="over")
+            ]
+        )
+        
+        # Identifier literals (with ::)
+        self.make_token_string_test(
+            "TokenString Identifier Literals",
+            "{ ::x ::y }",
+            [
+                Token(type="identifier_literal", value="x"),
+                Token(type="identifier_literal", value="y")
+            ]
+        )
+        
+        # Mixed identifiers and literals
+        self.make_token_string_test(
+            "TokenString Mixed Identifiers",
+            "{ ::Point get x swap }",
+            [
+                Token(type="identifier_literal", value="Point"),
+                Token(type="identifier", value="get"),
+                Token(type="identifier", value="x"),
+                Token(type="identifier", value="swap")
+            ]
+        )
+    
+    def generate_nested_tests(self):
+        """Generate tests with nested token strings."""
+        # Single nesting
+        inner_tokens = [
+            Token(type="i64", value=2),
+            Token(type="i64", value=3),
+            Token(type="identifier", value="+")
+        ]
+        inner_token_string = self.make_token_string_token(inner_tokens)
+        
+        self.make_token_string_test(
+            "TokenString Nested Single",
+            "{ { 2 3 + } }",
+            [inner_token_string]
+        )
+        
+        # Nested with other tokens
+        self.make_token_string_test(
+            "TokenString Nested With Others",
+            "{ x { dup * } }",
+            [
+                Token(type="identifier", value="x"),
+                self.make_token_string_token([
+                    Token(type="identifier", value="dup"),
+                    Token(type="identifier", value="*")
+                ])
+            ]
+        )
+        
+        # Multiple nested
+        self.make_token_string_test(
+            "TokenString Multiple Nested",
+            "{ { 2 3 + } { 4 5 * } }",
+            [
+                self.make_token_string_token([
+                    Token(type="i64", value=2),
+                    Token(type="i64", value=3),
+                    Token(type="identifier", value="+")
+                ]),
+                self.make_token_string_token([
+                    Token(type="i64", value=4),
+                    Token(type="i64", value=5),
+                    Token(type="identifier", value="*")
+                ])
+            ]
+        )
+        
+        # Double nesting
+        deepest = self.make_token_string_token([Token(type="i64", value=42)])
+        middle = self.make_token_string_token([deepest])
+        
+        self.make_token_string_test(
+            "TokenString Double Nested",
+            "{ { { 42 } } }",
+            [middle]
+        )
+        
+        # Complex nesting with mixed content
+        self.make_token_string_test(
+            "TokenString Complex Nesting",
+            "{ 1 { 2 { 3 } 4 } 5 }",
+            [
+                Token(type="i64", value=1),
+                self.make_token_string_token([
+                    Token(type="i64", value=2),
+                    self.make_token_string_token([
+                        Token(type="i64", value=3)
+                    ]),
+                    Token(type="i64", value=4)
+                ]),
+                Token(type="i64", value=5)
+            ]
+        )
+    
+    def generate_whitespace_tests(self):
+        """Generate tests with various whitespace patterns."""
+        # No whitespace inside
+        self.make_token_string_test(
+            "TokenString No Whitespace",
+            "{2 3 +}",
+            [
+                Token(type="i64", value=2),
+                Token(type="i64", value=3),
+                Token(type="identifier", value="+")
+            ]
+        )
+        
+        # Extra whitespace
+        self.make_token_string_test(
+            "TokenString Extra Whitespace",
+            "{   2    3     +   }",
+            [
+                Token(type="i64", value=2),
+                Token(type="i64", value=3),
+                Token(type="identifier", value="+")
+            ]
+        )
+        
+        # Leading whitespace outside
+        self.make_token_string_test(
+            "TokenString Leading Whitespace Outside",
+            "   { 2 3 + }",
+            [
+                Token(type="i64", value=2),
+                Token(type="i64", value=3),
+                Token(type="identifier", value="+")
+            ]
+        )
+        
+        # Trailing whitespace outside
+        self.make_token_string_test(
+            "TokenString Trailing Whitespace Outside",
+            "{ 2 3 + }   ",
+            [
+                Token(type="i64", value=2),
+                Token(type="i64", value=3),
+                Token(type="identifier", value="+")
+            ]
+        )
+        
+        # Tabs
+        self.make_token_string_test(
+            "TokenString With Tabs",
+            "{\\t2\\t3\\t+\\t}",
+            [
+                Token(type="i64", value=2),
+                Token(type="i64", value=3),
+                Token(type="identifier", value="+")
+            ]
+        )
+    
+    def generate_multiline_tests(self):
+        """Generate tests with multiline token strings."""
+        # Simple multiline
+        self.make_token_string_test(
+            "TokenString Multiline Simple",
+            "{\\n    2 3 +\\n}",
+            [
+                Token(type="i64", value=2),
+                Token(type="i64", value=3),
+                Token(type="identifier", value="+")
+            ]
+        )
+        
+        # Multiple lines with tokens
+        self.make_token_string_test(
+            "TokenString Multiline Multiple",
+            "{\\n    dup\\n    *\\n    2\\n    +\\n}",
+            [
+                Token(type="identifier", value="dup"),
+                Token(type="identifier", value="*"),
+                Token(type="i64", value=2),
+                Token(type="identifier", value="+")
+            ]
+        )
+        
+        # Mixed line breaks
+        self.make_token_string_test(
+            "TokenString Mixed Line Breaks",
+            "{ 1 2\\n3 4\\n\\n5 6 }",
+            [
+                Token(type="i64", value=1),
+                Token(type="i64", value=2),
+                Token(type="i64", value=3),
+                Token(type="i64", value=4),
+                Token(type="i64", value=5),
+                Token(type="i64", value=6)
+            ]
+        )
+        
+        # Indented multiline
+        self.make_token_string_test(
+            "TokenString Indented Multiline",
+            "{\\n    dup 0 >\\n        { }\\n        { 0 swap - }\\n    if\\n}",
+            [
+                Token(type="identifier", value="dup"),
+                Token(type="i64", value=0),
+                Token(type="identifier", value=">"),
+                self.make_token_string_token([]),
+                self.make_token_string_token([
+                    Token(type="i64", value=0),
+                    Token(type="identifier", value="swap"),
+                    Token(type="identifier", value="-")
+                ]),
+                Token(type="identifier", value="if")
+            ]
+        )
+    
+    def generate_comment_tests(self):
+        """Generate tests with comments inside token strings."""
+        # Comment at end of line inside token string
+        self.make_token_string_test(
+            "TokenString Comment End Of Line",
+            "{ 2 3 + // add them\\n}",
+            [
+                Token(type="i64", value=2),
+                Token(type="i64", value=3),
+                Token(type="identifier", value="+")
+            ]
+        )
+        
+        # Multiple comments
+        self.make_token_string_test(
+            "TokenString Multiple Comments",
+            "{ 2 // first\\n3 // second\\n+ // add\\n}",
+            [
+                Token(type="i64", value=2),
+                Token(type="i64", value=3),
+                Token(type="identifier", value="+")
+            ]
+        )
+        
+        # Comment on its own line
+        self.make_token_string_test(
+            "TokenString Comment Own Line",
+            "{\\n    // This is a comment\\n    2 3 +\\n}",
+            [
+                Token(type="i64", value=2),
+                Token(type="i64", value=3),
+                Token(type="identifier", value="+")
+            ]
+        )
+        
+        # Comment at start
+        self.make_token_string_test(
+            "TokenString Comment At Start",
+            "{ // comment\\n2 3 + }",
+            [
+                Token(type="i64", value=2),
+                Token(type="i64", value=3),
+                Token(type="identifier", value="+")
+            ]
+        )
+        
+        # Multiple comment lines
+        self.make_token_string_test(
+            "TokenString Multiple Comment Lines",
+            "{\\n    // First comment\\n    // Second comment\\n    2 3 +\\n}",
+            [
+                Token(type="i64", value=2),
+                Token(type="i64", value=3),
+                Token(type="identifier", value="+")
+            ]
+        )
+        
+        # Comments in nested token strings
+        self.make_token_string_test(
+            "TokenString Comments Nested",
+            "{ { 2 3 + // inner comment\\n} // outer comment\\n}",
+            [
+                self.make_token_string_token([
+                    Token(type="i64", value=2),
+                    Token(type="i64", value=3),
+                    Token(type="identifier", value="+")
+                ])
+            ]
+        )
+    
+    def generate_error_tests(self):
+        """Generate error test cases."""
+        # Unclosed token string
+        self.make_error_test(
+            "TokenString Unclosed",
+            "{ 2 3 +",
+            "Unclosed token string: missing closing brace '}'."
+        )
+        
+        # Unclosed nested
+        self.make_error_test(
+            "TokenString Unclosed Nested",
+            "{ { 2 3 + }",
+            "Unclosed token string: missing closing brace '}'."
+        )
+        
+        # Extra closing brace (generates two tokens: valid token string + error)
+        token = self.make_token_string_token([
+            Token(type="i64", value=2),
+            Token(type="i64", value=3),
+            Token(type="identifier", value="+")
+        ])
+        error_token = self.make_error_token(
+            "Unexpected closing brace '}' without matching opening brace."
+        )
+        self.add_test(
+            "TokenString Extra Closing Brace",
+            "{ 2 3 + } }",
+            [token, error_token]
+        )
+        
+        # Only closing brace
+        self.make_error_test(
+            "TokenString Only Closing Brace",
+            "}",
+            "Unexpected closing brace '}' without matching opening brace."
+        )
+        
+        # Error inside token string (invalid literal)
+        error_inside = self.make_token_string_token([
+            Token(type="i64", value=2),
+            Token(type="error", value="Invalid decimal literal: unexpected 'a' in decimal integer."),
+            Token(type="identifier", value="+")
+        ])
+        op_value = {"tokens": [
+            {"type": "i64", "value": 2},
+            {"type": "error", "value": "Invalid decimal literal: unexpected 'a' in decimal integer."},
+            {"type": "identifier", "value": "+"}
+        ]}
+        op = self.make_push_op("token_string", op_value)
+        stack = self.make_stack_item("token_string", op_value)
+        
+        self.add_test(
+            "TokenString Error Inside",
+            "{ 2 3a + }",
+            [error_inside],
+            [op],
+            [stack]
+        )
+        
+        # Unclosed string inside token string
+        error_string = self.make_token_string_token([
+            Token(type="error", value="Invalid string literal: unclosed string literal.")
+        ])
+        op_value_str = {"tokens": [
+            {"type": "error", "value": "Invalid string literal: unclosed string literal."}
+        ]}
+        op_str = self.make_push_op("token_string", op_value_str)
+        stack_str = self.make_stack_item("token_string", op_value_str)
+        
+        if self.ENABLE_STRINGS:
+            self.add_test(
+                "TokenString Unclosed String Inside",
+                '{ "hello }',
+                [error_string],
+                [op_str],
+                [stack_str]
+            )
+    
+    def generate_complex_tests(self):
+        """Generate complex realistic test cases."""
+        # Function body
+        self.make_token_string_test(
+            "TokenString Function Body",
+            "{ dup * }",
+            [
+                Token(type="identifier", value="dup"),
+                Token(type="identifier", value="*")
+            ]
+        )
+        
+        # If statement branches
+        if self.ENABLE_STRINGS:
+            self.make_token_string_test(
+                "TokenString If Branches",
+                '{ "positive" print }',
+                [
+                    Token(type="String", value="positive"),
+                    Token(type="identifier", value="print")
+                ]
+            )
+        
+        # Loop body
+        self.make_token_string_test(
+            "TokenString Loop Body",
+            "{ dup print 1 + }",
+            [
+                Token(type="identifier", value="dup"),
+                Token(type="identifier", value="print"),
+                Token(type="i64", value=1),
+                Token(type="identifier", value="+")
+            ]
+        )
+        
+        # Struct definition
+        self.make_token_string_test(
+            "TokenString Struct Fields",
+            "{ x: y: }",
+            [
+                Token(type="identifier", value="x"),
+                Token(type="identifier", value=":"),
+                Token(type="identifier", value="y"),
+                Token(type="identifier", value=":")
+            ]
+        )
+        
+        # Lambda expression
+        self.make_token_string_test(
+            "TokenString Lambda",
+            "{ 2 * }",
+            [
+                Token(type="i64", value=2),
+                Token(type="identifier", value="*")
+            ]
+        )
+        
+        # Array map operation
+        self.make_token_string_test(
+            "TokenString Array Map",
+            "{ dup * }",
+            [
+                Token(type="identifier", value="dup"),
+                Token(type="identifier", value="*")
+            ]
+        )
+        
+        # Conditional with nested token strings
+        self.make_token_string_test(
+            "TokenString Conditional Complex",
+            "{\\n    dup 0 >\\n        { dup * }\\n        { drop 0 }\\n    if\\n}",
+            [
+                Token(type="identifier", value="dup"),
+                Token(type="i64", value=0),
+                Token(type="identifier", value=">"),
+                self.make_token_string_token([
+                    Token(type="identifier", value="dup"),
+                    Token(type="identifier", value="*")
+                ]),
+                self.make_token_string_token([
+                    Token(type="identifier", value="drop"),
+                    Token(type="i64", value=0)
+                ]),
+                Token(type="identifier", value="if")
+            ]
+        )
+    
+    def generate_all_tests(self) -> List[Dict[str, Any]]:
+        """Generate all token string test cases."""
+        # Basic tests
+        self.generate_basic_tests()
+        
+        # Literal types
+        self.generate_literal_tests()
+        
+        # Identifiers
+        self.generate_identifier_tests()
+        
+        # Nested token strings
+        self.generate_nested_tests()
+        
+        # Whitespace handling
+        self.generate_whitespace_tests()
+        
+        # Multiline token strings
+        self.generate_multiline_tests()
+        
+        # Comments inside token strings
+        self.generate_comment_tests()
+        
+        # Error cases
+        self.generate_error_tests()
+        
+        # Complex realistic cases
+        self.generate_complex_tests()
+        
+        return self.get_tests()
+

SLS_Tests/interpreter_tester/README.md

@@ -0,0 +1,124 @@
+# Interpreter Test Runner
+
+Requires `pip install pyyaml`
+
+Test SLS (UNIX):  
+`python3 test_runner.py ../../SLS_C/bin/sls tests.yaml`  
+`python3 test_runner.py "python3 -m ../../SLS_Python/sls" tests.yaml`  
+`python3 test_runner.py ../../SLS_Rust/target/debug/sls tests.yaml`  
+
+Test SLS (Windows):  
+`python test_runner.py ..\..\SLS_C\bin\sls.exe tests.yaml`  
+`python test_runner.py "python -m ..\..\SLS_Python\sls" tests.yaml`  
+`python test_runner.py ..\..\SLS_Rust\target\debug\sls.exe tests.yaml`  
+
+Python Examples:  
+`python test_runner.py python python_tests.yaml`  
+`python test_runner.py pypy python_tests.yaml`  
+
+```
+>python test_runner.py python python_tests.yaml
+✓ PASS: Simple print statement
+
+✓ PASS: Basic arithmetic
+
+✓ PASS: Variable assignment and usage
+
+✗ FAIL: Syntax error detection
+  Reason: stderr mismatch
+Expected:
+SyntaxError: unterminated string literal (detected at line 1)
+
+Got:
+  File "<stdin>", line 1
+    print("missing closing quote)
+          ^
+SyntaxError: unterminated string literal (detected at line 1)
+
+
+✓ PASS: Import and use module
+
+✓ PASS: List operations
+
+✓ PASS: Execute Python file with args
+
+✓ PASS: Division by zero error
+
+✗ FAIL: Check Python version (using args instead of stdin)
+  Reason: stdout mismatch
+Expected:
+Python 3
+Got:
+Python 3.14.0
+
+
+✓ PASS: Multi-line function definition
+
+✓ PASS: Long running operation with custom timeout
+
+============================================================
+TEST SUMMARY
+============================================================
+Total tests: 11
+Passed: 9
+Failed: 2
+
+Failed tests:
+  - Syntax error detection
+  - Check Python version (using args instead of stdin)
+============================================================
+```
+
+```
+>python test_runner.py pypy python_tests.yaml
+✓ PASS: Simple print statement
+
+✓ PASS: Basic arithmetic
+
+✓ PASS: Variable assignment and usage
+
+✗ FAIL: Syntax error detection
+  Reason: stderr mismatch
+Expected:
+SyntaxError: unterminated string literal (detected at line 1)
+
+Got:
+  File "<stdin>", line 1
+    print("missing closing quote)
+          ^^^^^^^^^^^^^^^^^^^^^^^
+SyntaxError: unterminated string literal (detected at line 1)
+
+
+✓ PASS: Import and use module
+
+✓ PASS: List operations
+
+✓ PASS: Execute Python file with args
+
+✓ PASS: Division by zero error
+
+✗ FAIL: Check Python version (using args instead of stdin)
+  Reason: stdout mismatch
+Expected:
+Python 3
+Got:
+Python 3.10.13 (f1607341da97ff5a1e93430b6e8c4af0ad1aa019, Sep 28 2023, 05:42:24)
+[PyPy 7.3.13 with MSC v.1929 64 bit (AMD64)]
+
+
+✓ PASS: Multi-line function definition
+
+✓ PASS: Long running operation with custom timeout
+
+============================================================
+TEST SUMMARY
+============================================================
+Total tests: 11
+Passed: 9
+Failed: 2
+
+Failed tests:
+  - Syntax error detection
+  - Check Python version (using args instead of stdin)
+============================================================
+```

SLS_Tests/interpreter_tester/python_tests.yaml

@@ -0,0 +1,95 @@
+tests:
+  - name: "Simple print statement"
+    stdin: |
+      print("Hello, World!")
+    stdout: |
+      Hello, World!
+    exit: success
+
+  - name: "Basic arithmetic"
+    stdin: |
+      print(2 + 2)
+      print(10 * 5)
+    stdout: |
+      4
+      50
+    exit: success
+
+  - name: "Variable assignment and usage"
+    stdin: |
+      x = 42
+      y = 8
+      print(x + y)
+    stdout: |
+      50
+    exit: success
+
+  - name: "Syntax error detection"
+    stdin: |
+      print("missing closing quote)
+    stderr: |
+      SyntaxError: unterminated string literal (detected at line 1)
+    exit: error
+    error_code: 1
+
+  - name: "Import and use module"
+    stdin: |
+      import math
+      print(math.pi)
+    stdout: |
+      3.141592653589793
+    exit: success
+
+  - name: "List operations"
+    stdin: |
+      numbers = [1, 2, 3, 4, 5]
+      print(sum(numbers))
+      print(len(numbers))
+    stdout: |
+      15
+      5
+    exit: success
+
+  - name: "Execute Python file with args"
+    args: ["-c", "import sys; print(f'Args: {sys.argv[1:]}'); print('Done')", "arg1", "arg2"]
+    stdout: |
+      Args: ['arg1', 'arg2']
+      Done
+    exit: success
+
+  - name: "Division by zero error"
+    stdin: |
+      print(1 / 0)
+    stderr: |
+      Traceback (most recent call last):
+        File "<stdin>", line 1, in <module>
+      ZeroDivisionError: division by zero
+    exit: error
+
+  - name: "Check Python version (using args instead of stdin)"
+    args: ["--version"]
+    stdout: "Python 3"
+    exit: success
+    timeout: 2.0
+
+  - name: "Multi-line function definition"
+    stdin: |
+      def greet(name):
+          return f"Hello, {name}!"
+      
+      print(greet("Alice"))
+      print(greet("Bob"))
+    stdout: |
+      Hello, Alice!
+      Hello, Bob!
+    exit: success
+
+  - name: "Long running operation with custom timeout"
+    stdin: |
+      import time
+      time.sleep(0.5)
+      print("Done sleeping")
+    stdout: |
+      Done sleeping
+    exit: success
+    timeout: 2.0

SLS_Tests/interpreter_tester/test_runner.py

@@ -0,0 +1,212 @@
+#!/usr/bin/env python3
+"""
+CLI Testing Script - Test executables with stdin/stdout/stderr validation
+"""
+
+import argparse
+import subprocess
+import sys
+import yaml
+from pathlib import Path
+from typing import Optional, Dict, Any, List
+from dataclasses import dataclass
+from enum import Enum
+
+
+class ExitBehavior(Enum):
+    NONE = "none"
+    SUCCESS = "success"
+    ERROR = "error"
+
+
+@dataclass
+class TestResult:
+    name: str
+    passed: bool
+    reason: Optional[str] = None
+
+
+class TestRunner:
+    def __init__(self, executable: str, default_timeout: float = 5.0):
+        self.executable = executable
+        self.default_timeout = default_timeout
+        self.results: List[TestResult] = []
+
+    def run_command(self, stdin: Optional[str], args: List[str], timeout: float) -> tuple:
+        """Run the executable and capture output"""
+        try:
+            cmd = [self.executable] + args
+            result = subprocess.run(
+                cmd,
+                input=stdin,
+                capture_output=True,
+                text=True,
+                timeout=timeout
+            )
+            return result.stdout, result.stderr, result.returncode, None
+        except subprocess.TimeoutExpired:
+            return None, None, None, "Timeout"
+        except Exception as e:
+            return None, None, None, f"Error: {str(e)}"
+
+    def normalize_output(self, text: Optional[str]) -> str:
+        """Normalize output by stripping trailing whitespace from each line"""
+        if text is None:
+            return ""
+        lines = text.split('\n')
+        return '\n'.join(line.rstrip() for line in lines)
+
+    def check_exit_behavior(self, returncode: int, expected: Dict[str, Any]) -> tuple[bool, Optional[str]]:
+        """Check if exit behavior matches expectation"""
+        behavior = expected.get("exit", "none")
+        
+        if behavior == "none":
+            return True, None
+        elif behavior == "success":
+            if returncode == 0:
+                return True, None
+            return False, f"Expected success (exit 0), got exit code {returncode}"
+        elif behavior == "error":
+            expected_code = expected.get("error_code")
+            if expected_code is not None:
+                if returncode == expected_code:
+                    return True, None
+                return False, f"Expected error code {expected_code}, got {returncode}"
+            else:
+                if returncode != 0:
+                    return True, None
+                return False, f"Expected error (non-zero exit), got exit code 0"
+        
+        return False, f"Unknown exit behavior: {behavior}"
+
+    def run_test(self, test: Dict[str, Any]) -> TestResult:
+        """Run a single test case"""
+        name = test.get("name", "Unnamed test")
+        timeout = test.get("timeout", self.default_timeout)
+        
+        # Setup phase
+        setup_stdin = test.get("setup")
+        if setup_stdin:
+            setup_args = test.get("setup_args", [])
+            _, _, _, error = self.run_command(setup_stdin, setup_args, timeout)
+            if error:
+                return TestResult(name, False, f"Setup failed: {error}")
+        
+        # Main test execution
+        stdin = test.get("stdin")
+        args = test.get("args", [])
+        stdout, stderr, returncode, error = self.run_command(stdin, args, timeout)
+        
+        if error:
+            # Cleanup even on error
+            self.run_cleanup(test, timeout)
+            return TestResult(name, False, error)
+        
+        # Check stdout
+        expected_stdout = test.get("stdout")
+        if expected_stdout is not None:
+            actual = self.normalize_output(stdout)
+            expected = self.normalize_output(expected_stdout)
+            if actual != expected:
+                self.run_cleanup(test, timeout)
+                return TestResult(name, False, f"stdout mismatch\nExpected:\n{expected}\nGot:\n{actual}")
+        
+        # Check stderr
+        expected_stderr = test.get("stderr")
+        if expected_stderr is not None:
+            actual = self.normalize_output(stderr)
+            expected = self.normalize_output(expected_stderr)
+            if actual != expected:
+                self.run_cleanup(test, timeout)
+                return TestResult(name, False, f"stderr mismatch\nExpected:\n{expected}\nGot:\n{actual}")
+        
+        # Check exit behavior
+        passed, reason = self.check_exit_behavior(returncode, test)
+        if not passed:
+            self.run_cleanup(test, timeout)
+            return TestResult(name, False, reason)
+        
+        # Cleanup phase
+        cleanup_result = self.run_cleanup(test, timeout)
+        if cleanup_result:
+            return TestResult(name, False, f"Cleanup failed: {cleanup_result}")
+        
+        return TestResult(name, True)
+
+    def run_cleanup(self, test: Dict[str, Any], timeout: float) -> Optional[str]:
+        """Run cleanup if specified"""
+        cleanup_stdin = test.get("cleanup")
+        if cleanup_stdin:
+            cleanup_args = test.get("cleanup_args", [])
+            _, _, _, error = self.run_command(cleanup_stdin, cleanup_args, timeout)
+            return error
+        return None
+
+    def run_all_tests(self, tests: List[Dict[str, Any]]):
+        """Run all tests and collect results"""
+        for test in tests:
+            result = self.run_test(test)
+            self.results.append(result)
+            
+            # Print immediate result
+            status = "✓ PASS" if result.passed else "✗ FAIL"
+            print(f"{status}: {result.name}")
+            if not result.passed and result.reason:
+                print(f"  Reason: {result.reason}")
+            print()
+
+    def print_summary(self):
+        """Print test summary"""
+        total = len(self.results)
+        passed = sum(1 for r in self.results if r.passed)
+        failed = total - passed
+        
+        print("=" * 60)
+        print("TEST SUMMARY")
+        print("=" * 60)
+        print(f"Total tests: {total}")
+        print(f"Passed: {passed}")
+        print(f"Failed: {failed}")
+        
+        if failed > 0:
+            print("\nFailed tests:")
+            for result in self.results:
+                if not result.passed:
+                    print(f"  - {result.name}")
+        
+        print("=" * 60)
+        
+        return 0 if failed == 0 else 1
+
+
+def main():
+    parser = argparse.ArgumentParser(description="Test CLI executables with YAML test definitions")
+    parser.add_argument("executable", help="Path to the executable to test")
+    parser.add_argument("tests", help="Path to YAML test file")
+    parser.add_argument("--timeout", type=float, default=5.0, help="Default timeout in seconds (default: 5.0)")
+    
+    args = parser.parse_args()
+    
+    # Load test file
+    try:
+        with open(args.tests, 'r') as f:
+            test_data = yaml.safe_load(f)
+    except Exception as e:
+        print(f"Error loading test file: {e}", file=sys.stderr)
+        return 1
+    
+    tests = test_data.get("tests", [])
+    if not tests:
+        print("No tests found in test file", file=sys.stderr)
+        return 1
+    
+    # Run tests
+    runner = TestRunner(args.executable, args.timeout)
+    runner.run_all_tests(tests)
+    
+    # Print summary and return exit code
+    return runner.print_summary()
+
+
+if __name__ == "__main__":
+    sys.exit(main())

SLS_Tests/interpreter_tester/tests.yaml

@@ -0,0 +1,706 @@
+tests:
+  # Basic Stack Operations
+  - name: "Simple value push"
+    stdin: |
+      42 print
+    stdout: |
+      42
+    exit: success
+
+  - name: "Multiple values and operations"
+    stdin: |
+      3 4 + print
+      10 5 - print
+    stdout: |
+      7
+      5
+    exit: success
+
+  - name: "Stack manipulation - dup"
+    stdin: |
+      5 dup print print
+    stdout: |
+      5
+      5
+    exit: success
+
+  - name: "Stack manipulation - swap"
+    stdin: |
+      10 20 swap print print
+    stdout: |
+      10
+      20
+    exit: success
+
+  - name: "Stack manipulation - over"
+    stdin: |
+      5 10 over print print print
+    stdout: |
+      5
+      10
+      5
+    exit: success
+
+  - name: "Stack manipulation - rot"
+    stdin: |
+      1 2 3 rot print print print
+    stdout: |
+      1
+      2
+      3
+    exit: success
+
+  - name: "Stack depth"
+    stdin: |
+      1 2 3 depth print
+    stdout: |
+      3
+    exit: success
+
+  # Arithmetic Operations
+  - name: "Basic arithmetic - all operators"
+    stdin: |
+      10 3 + print
+      10 3 - print
+      10 3 * print
+      10 3 / print
+      10 3 % print
+    stdout: |
+      13
+      7
+      30
+      3
+      1
+    exit: success
+
+  - name: "Exponentiation"
+    stdin: |
+      2 8 ^ print
+      3 3 ^ print
+    stdout: |
+      256
+      27
+    exit: success
+
+  - name: "Floating point arithmetic"
+    stdin: |
+      3.14 2.0 + print
+      10.5 2.5 * print
+    stdout: |
+      5.14
+      26.25
+    exit: success
+
+  - name: "Mathematical functions"
+    stdin: |
+      16 sqrt print
+      -42 abs print
+      3.7 round print
+      3.14 floor print
+      3.14 ceil print
+    stdout: |
+      4.0
+      42
+      4.0
+      3.0
+      4.0
+    exit: success
+
+  - name: "Min and max"
+    stdin: |
+      3 5 min print
+      3 5 max print
+    stdout: |
+      3
+      5
+    exit: success
+
+  # Comparison Operations
+  - name: "Comparison operators"
+    stdin: |
+      5 3 > print
+      5 3 < print
+      5 5 == print
+      5 3 != print
+      5 5 >= print
+      3 5 <= print
+    stdout: |
+      true
+      false
+      true
+      true
+      true
+      true
+    exit: success
+
+  # Logical Operations
+  - name: "Logical operators"
+    stdin: |
+      true false and print
+      true false or print
+      false not print
+    stdout: |
+      false
+      true
+      true
+    exit: success
+
+  # Bitwise Operations
+  - name: "Bitwise operations"
+    stdin: |
+      0xFF 0x0F bitand print
+      0xF0 0x0F bitor print
+      0xFF 0x0F bitxor print
+      4 2 shl print
+      16 2 shr print
+    stdout: |
+      15
+      255
+      240
+      16
+      4
+    exit: success
+
+  # String Operations
+  - name: "String concatenation"
+    stdin: |
+      "hello" " world" concat print
+    stdout: |
+      hello world
+    exit: success
+
+  - name: "String length and substring"
+    stdin: |
+      "hello" length print
+      "hello" 1 3 substr print
+    stdout: |
+      5
+      el
+    exit: success
+
+  - name: "String split and join"
+    stdin: |
+      "a,b,c" "," split print
+    stdout: |
+      ["a" "b" "c"]
+    exit: success
+
+  - name: "String searching"
+    stdin: |
+      "hello" "hel" starts_with print
+      "hello" "lo" ends_with print
+    stdout: |
+      true
+      true
+    exit: success
+
+  - name: "String trimming and replacement"
+    stdin: |
+      "  hello  " trim print
+      "hello world" "world" "Stack" replace print
+    stdout: |
+      hello
+      hello Stack
+    exit: success
+
+  # Array Operations
+  - name: "Array literals and access"
+    stdin: |
+      [1 2 3 4 5] print
+      [1 2 3 4 5] 2 at print
+      [1 2 3 4 5] length print
+    stdout: |
+      [1 2 3 4 5]
+      3
+      5
+    exit: success
+
+  - name: "Array slice"
+    stdin: |
+      [10 20 30 40 50] 1 3 slice print
+    stdout: |
+      [20 30]
+    exit: success
+
+  - name: "Array map"
+    stdin: |
+      [1 2 3 4] { 2 * } map print
+    stdout: |
+      [2 4 6 8]
+    exit: success
+
+  - name: "Array filter"
+    stdin: |
+      [1 2 3 4 5] { 2 % 0 == } filter print
+    stdout: |
+      [2 4]
+    exit: success
+
+  - name: "Array reduce"
+    stdin: |
+      [1 2 3 4] 0 { + } reduce print
+    stdout: |
+      10
+    exit: success
+
+  - name: "Array sum and mean"
+    stdin: |
+      [1 2 3 4 5] sum print
+      [1 2 3 4 5] mean print
+    stdout: |
+      15
+      3.0
+    exit: success
+
+  - name: "Array zip and enumerate"
+    stdin: |
+      [1 2 3] [4 5 6] zip print
+      ["a" "b" "c"] enumerate print
+    stdout: |
+      [[1 4] [2 5] [3 6]]
+      [[0 "a"] [1 "b"] [2 "c"]]
+    exit: success
+
+  - name: "Array reverse and transpose"
+    stdin: |
+      [1 2 3] reverse print
+      [[1 2] [3 4]] transpose print
+    stdout: |
+      [3 2 1]
+      [[1 3] [2 4]]
+    exit: success
+
+  # Function Definition and Calling
+  - name: "Simple function definition"
+    stdin: |
+      (Number -- Number) { dup * } ::square fn
+      5 square print
+    stdout: |
+      25
+    exit: success
+
+  - name: "Function with multiple operations"
+    stdin: |
+      (Number Number -- Number Number) {
+        over over / swap %
+      } ::divmod fn
+      10 3 divmod print print
+    stdout: |
+      3
+      1
+    exit: success
+
+  - name: "Recursive factorial"
+    stdin: |
+      (Number -- Number) {
+        dup 1 <=
+          { drop 1 }
+          { dup 1 - factorial * }
+        if
+      } ::factorial fn
+      5 factorial print
+    stdout: |
+      120
+    exit: success
+
+  # Control Flow - Conditionals
+  - name: "Simple if statement"
+    stdin: |
+      5 0 > { "positive" print } { "negative" print } if
+    stdout: |
+      positive
+    exit: success
+
+  - name: "If with else branch"
+    stdin: |
+      -3 0 > { "positive" print } { "non-positive" print } if
+    stdout: |
+      non-positive
+    exit: success
+
+  - name: "Nested conditionals"
+    stdin: |
+      5 0 >
+        {
+          5 10 
+            { "between 0 and 10" print }
+            { "greater than 10" print }
+          if
+        }
+        { "negative or zero" print }
+      if
+    stdout: |
+      between 0 and 10
+    exit: success
+
+  # Control Flow - Loops
+  - name: "For loop"
+    stdin: |
+      1 5 { dup print } for
+    stdout: |
+      1
+      2
+      3
+      4
+      5
+    exit: success
+
+  - name: "While loop"
+    stdin: |
+      0
+      { dup 3 < }
+      {
+        dup print
+        1 +
+      }
+      while
+      drop
+    stdout: |
+      0
+      1
+      2
+    exit: success
+
+  - name: "Loop with break"
+    stdin: |
+      1 10 {
+        dup 5 ==
+          { break }
+          { dup print }
+        if
+      } for
+    stdout: |
+      1
+      2
+      3
+      4
+    exit: success
+
+  - name: "Loop with continue"
+    stdin: |
+      1 5 {
+        dup 2 % 0 ==
+          { continue }
+          { dup print }
+        if
+      } for
+    stdout: |
+      1
+      3
+      5
+    exit: success
+
+  # Structs
+  - name: "Struct definition and creation"
+    stdin: |
+      (Number Number --) { x: y: } ::Point struct
+      3.0 4.0 Point print
+    stdout: |
+      Point { x: 3.0, y: 4.0 }
+    exit: success
+
+  - name: "Struct field access"
+    stdin: |
+      (Number Number --) { x: y: } ::Point struct
+      3.0 4.0 Point
+      dup ::x get print
+      ::y get print
+    stdout: |
+      3.0
+      4.0
+    exit: success
+
+  - name: "Struct field modification"
+    stdin: |
+      (Number Number --) { x: y: } ::Point struct
+      3.0 4.0 Point
+      10.0 ::x set
+      ::x get print
+    stdout: |
+      10.0
+    exit: success
+
+  # Unions
+  - name: "Union creation - Option type"
+    stdin: |
+      (T --) { Some(T) None } ::Option union
+      42 Option::Some print
+      Option::None print
+    stdout: |
+      Option::Some(42)
+      Option::None
+    exit: success
+
+  - name: "Pattern matching with Option"
+    stdin: |
+      (T --) { Some(T) None } ::Option union
+      42 Option::Some {
+        Some(x) => { x print }
+        None => { "Nothing" print }
+      } match
+    stdout: |
+      42
+    exit: success
+
+  - name: "Result type pattern matching"
+    stdin: |
+      (T E --) { Ok(T) Err(E) } ::Result union
+      "success" Result::Ok {
+        Ok(val) => { val print }
+        Err(e) => { "Error: " e concat print }
+      } match
+    stdout: |
+      success
+    exit: success
+
+  # Enums
+  - name: "Enum definition and usage"
+    stdin: |
+      { Pending: Active: Complete: } ::Status enum
+      Status::Active print
+    stdout: |
+      Status::Active
+    exit: success
+
+  # Traits
+  - name: "Trait implementation for struct"
+    stdin: |
+      (Number Number --) { x: y: } ::Point struct
+      ::Addable {
+        (Self Self -- Self) {
+          over ::x get over ::x get +
+          swap ::y get swap ::y get +
+          Point
+        } +:
+      } ::Point impl
+      1.0 2.0 Point 3.0 4.0 Point + print
+    stdout: |
+      Point { x: 4.0, y: 6.0 }
+    exit: success
+
+  # Type Conversions
+  - name: "Type conversions"
+    stdin: |
+      42 to_f64 print
+      3.14 to_i32 print
+      42 to_str print
+    stdout: |
+      42.0
+      3
+      "42"
+    exit: success
+
+  - name: "String parsing"
+    stdin: |
+      "123" parse print
+    stdout: |
+      123
+    exit: success
+
+  # Constants
+  - name: "Constant definition and usage"
+    stdin: |
+      3.1415926535 ::pi const
+      5 dup * pi * print
+    stdout: |
+      78.53981633975
+    exit: success
+
+  # Lambda and Eval
+  - name: "Lambda function"
+    stdin: |
+      { dup * } lambda ::square swap
+      5 square eval print
+    stdout: |
+      25
+    exit: success
+
+  - name: "Eval operator"
+    stdin: |
+      "2 3 +" eval print
+    stdout: |
+      5
+    exit: success
+
+  # Reflection
+  - name: "Type checking with type_of"
+    stdin: |
+      42 type_of print
+      "hello" type_of print
+    stdout: |
+      ::i64
+      ::String
+    exit: success
+
+  - name: "Trait checking with implements"
+    stdin: |
+      42 ::Addable implements print
+      42 ::Drawable implements print
+    stdout: |
+      true
+      false
+    exit: success
+
+  # Assertions
+  - name: "Passing assertion"
+    stdin: |
+      { 2 3 + } { 5 == } assert
+      "Test passed" print
+    stdout: |
+      Test passed
+    exit: success
+
+  - name: "Failing assertion"
+    stdin: |
+      { 2 3 + } { 6 == } assert
+    stderr: |
+      Assertion failed
+    exit: error
+
+  # Randomness
+  - name: "Random number generation with seed"
+    stdin: |
+      12345 seed
+      rand 0.0 >= print
+      rand 1.0 < print
+    stdout: |
+      true
+      true
+    exit: success
+
+  # Complex Examples
+  - name: "FizzBuzz (1-15)"
+    stdin: |
+      (Number -- ) {
+        dup 15 % 0 ==
+          { drop "FizzBuzz" print }
+          {
+            dup 3 % 0 ==
+              { drop "Fizz" print }
+              {
+                dup 5 % 0 ==
+                  { drop "Buzz" print }
+                  { print }
+                if
+              }
+            if
+          }
+        if
+      } ::fizzbuzz fn
+      1 15 { fizzbuzz } for
+    stdout: |
+      1
+      2
+      Fizz
+      4
+      Buzz
+      Fizz
+      7
+      8
+      Fizz
+      Buzz
+      11
+      Fizz
+      13
+      14
+      FizzBuzz
+    exit: success
+
+  - name: "Sum of squares of even numbers"
+    stdin: |
+      [1 2 3 4 5 6 7 8 9 10]
+        { 2 % 0 == } filter
+        { dup * } map
+        0 { + } reduce
+      print
+    stdout: |
+      220
+    exit: success
+
+  # Error Cases
+  - name: "Type mismatch error"
+    stdin: |
+      "hello" 5 +
+    stderr: |
+      Type error
+    exit: error
+
+  - name: "Stack underflow"
+    stdin: |
+      +
+    stderr: |
+      Stack underflow
+    exit: error
+
+  - name: "Undefined identifier"
+    stdin: |
+      undefined_function
+    stderr: |
+      Undefined identifier: undefined_function
+    exit: error
+
+  - name: "Division by zero"
+    stdin: |
+      10 0 /
+    stderr: |
+      Division by zero
+    exit: error
+
+  # Character Literals
+  - name: "Character literals"
+    stdin: |
+      'A' print
+      '\n' print
+      '\u{1F600}' print
+    stdout: |
+      'A'
+      '\n'
+      '😀'
+    exit: success
+
+  # Multiple test with timeout
+  - name: "Complex computation with timeout"
+    stdin: |
+      1 100 { dup * } map 0 { + } reduce print
+    stdout: |
+      338350
+    exit: success
+    timeout: 2.0
+
+  # Comments
+  - name: "Comments ignored"
+    stdin: |
+      // This is a comment
+      5 // inline comment
+      3 + // another comment
+      print
+    stdout: |
+      8
+    exit: success
+
+  # Array of structs
+  - name: "Array of structs"
+    stdin: |
+      (Number Number --) { x: y: } ::Point struct
+      [1 2 Point 3 4 Point] print
+    stdout: |
+      [Point { x: 1, y: 2 }, Point { x: 3, y: 4 }]
+    exit: success
+
+  # Format strings
+  - name: "String formatting"
+    stdin: |
+      "x=%d, y=%d" [5 10] format print
+    stdout: |
+      x=5, y=10
+    exit: success
+
+  # Underscore separators in literals
+  - name: "Underscore separators in numbers"
+    stdin: |
+      1_000_000 print
+      3_1415.92_65 print
+    stdout: |
+      1000000
+      3141.9265
+    exit: success

SLS_Tests/yaml_to_c_tests.py

@@ -16,7 +16,7 @@ file_headers = """\
 #include <stdio.h>
 #include <math.h>
 
-#include "sls/sls_errors.h"
+#include "sls/errors.h"
 #include "sls/lexer.h"
 #include "sls/string.h"
 #include "tests/lexer_test_helpers.h"
@@ -27,7 +27,7 @@ file_headers = """\
 main_header = """\
 TestsReport run_lexer_tests() {
     TestsReport test_report = (TestsReport) {
-        .section = "lexer_tests",
+        .section = SLS_STR("lexer_tests"),
         .count = NUM_OF_TESTS,
         .tests = (TestResult *)malloc(sizeof(TestResult) * NUM_OF_TESTS),
     };
@@ -68,28 +68,179 @@ def _token_to_c_call(token: dict, idx_var="i") -> str:
         return f'test_integer_value(&test, result, {idx_var}++, &(TestIntegerValue){{INTEGER_U16, {value}}})'
     elif ttype == "u8":
         return f'test_integer_value(&test, result, {idx_var}++, &(TestIntegerValue){{INTEGER_U8, {value}}})'
+    elif ttype == "f64":
+        return f'test_double_value(&test, result, {idx_var}++, &(double){{{value}}})'
+    elif ttype == "f32":
+        return f'test_float_value(&test, result, {idx_var}++, &(float){{{value}}})'
+    elif ttype == "char":
+        return f'test_character_value(&test, result, {idx_var}++, &(uint8_t){{{ord(value)}}})' # type: ignore
+    elif ttype == "string":
+        return f'test_string_value(&test, result, {idx_var}++, &SLS_STR("{value}"))' # type: ignore
     elif ttype == "identifier":
-        return f'test_identifier_value(&test, result, {idx_var}++, &(TestIdentifierValue){{FALSE, {len(value)}, "{value}"}})' # type: ignore
+        return f'test_identifier_value(&test, result, {idx_var}++, &(TestIdentifierValue){{FALSE, SLS_STR("{value}")}})' # type: ignore
     elif ttype == "identifier_literal":
-        return f'test_identifier_value(&test, result, {idx_var}++, &(TestIdentifierValue){{TRUE, {len(value)}, "{value}"}})' # type: ignore
+        return f'test_identifier_value(&test, result, {idx_var}++, &(TestIdentifierValue){{TRUE, SLS_STR("{value}")}})' # type: ignore
+    elif ttype == "bool":
+        return f'test_boolean_value(&test, result, {idx_var}++, &(Boolean){{{"TRUE" if value else "FALSE"}}})' # type: ignore
     elif ttype == "error":
-        return f'test_for_error(&test, result, i++, &(TestErrorMessage){{{len(value)+1}, "{c_string_literal(value)}"}})' # type: ignore
+        return f'test_for_error(&test, result, i++, &SLS_STR("{c_string_literal(value)}"))' # type: ignore
+    elif ttype == "token_string":
+        return _token_string_c_call(idx_var, value) # type: ignore
     else:
         raise ValueError(f' Unhandled token type: {ttype}')
 
+def _token_string_c_call(idx_var: str, value: list[dict]) -> str:
+    """Generate C code for testing a token string value."""
+    if not value:  # Empty token string
+        return (
+            f'test_token_string_value(&test, result, {idx_var}++, '
+            f'&(TestTokenStringValue){{0, NULL}})'
+        )
+
+    # Generate token handler calls for each token in the string
+    token_handlers = []
+    for i, inner_token in enumerate(value):
+        inner_type = inner_token.get("type")
+        inner_value = inner_token.get("value")
+
+        # Determine the handler function and value initialization
+        if inner_type == "i64":
+            handler = "test_integer_value"
+            val_init = f'&(TestIntegerValue){{INTEGER_I64, {inner_value}}}'
+        elif inner_type == "i32":
+            handler = "test_integer_value"
+            val_init = f'&(TestIntegerValue){{INTEGER_I32, {inner_value}}}'
+        elif inner_type == "i16":
+            handler = "test_integer_value"
+            val_init = f'&(TestIntegerValue){{INTEGER_I16, {inner_value}}}'
+        elif inner_type == "i8":
+            handler = "test_integer_value"
+            val_init = f'&(TestIntegerValue){{INTEGER_I8, {inner_value}}}'
+        elif inner_type == "u64":
+            handler = "test_integer_value"
+            val_init = f'&(TestIntegerValue){{INTEGER_U64, {inner_value}}}'
+        elif inner_type == "u32":
+            handler = "test_integer_value"
+            val_init = f'&(TestIntegerValue){{INTEGER_U32, {inner_value}}}'
+        elif inner_type == "u16":
+            handler = "test_integer_value"
+            val_init = f'&(TestIntegerValue){{INTEGER_U16, {inner_value}}}'
+        elif inner_type == "u8":
+            handler = "test_integer_value"
+            val_init = f'&(TestIntegerValue){{INTEGER_U8, {inner_value}}}'
+        elif inner_type == "f64":
+            handler = "test_double_value"
+            val_init = f'&(double){{{inner_value}}}'
+        elif inner_type == "f32":
+            handler = "test_float_value"
+            val_init = f'&(float){{{inner_value}}}'
+        elif inner_type == "char":
+            handler = "test_character_value"
+            val_init = f'&(uint8_t){{{ord(inner_value)}}}' # type: ignore
+        elif inner_type == "string":
+            handler = "test_string_value"
+            val_init = f'&SLS_STR("{c_string_literal(inner_value)}")' # type: ignore
+        elif inner_type == "identifier":
+            handler = "test_identifier_value"
+            val_init = f'&(TestIdentifierValue){{FALSE, SLS_STR("{inner_value}")}}'
+        elif inner_type == "identifier_literal":
+            handler = "test_identifier_value"
+            val_init = f'&(TestIdentifierValue){{TRUE, SLS_STR("{inner_value}")}}'
+        elif inner_type == "bool":
+            handler = "test_boolean_value"
+            val_init = f'&(Boolean){{{"TRUE" if inner_value else "FALSE"}}}'
+        elif inner_type == "error":
+            handler = "test_for_error"
+            val_init = f'&SLS_STR("{c_string_literal(inner_value)}")' # type: ignore
+        elif inner_type == "token_string":
+            # Nested token string - recursive call
+            handler = "test_token_string_value"
+            val_init = _token_string_value_init(inner_token.get("value", []))
+        else:
+            raise ValueError(f'Unhandled token type in token string: {inner_type}')
+
+        token_handlers.append(
+            f'{{(Boolean (*)(LexerTest *, LexerResult, size_t, void *)){handler}, '
+            f'{val_init}}}'
+        )
+
+    # Generate the array initialization
+    tokens_array = f'(TestTokenStringToken[]){{{", ".join(token_handlers)}}}'
+
+    return (
+        f'test_token_string_value(&test, result, {idx_var}++, '
+        f'&(TestTokenStringValue){{{len(value)}, {tokens_array}}})'
+    )
+
+def _token_string_value_init(value: list[dict]) -> str:
+    """Generate initialization code for a TestTokenStringValue (for nested token strings)."""
+    if not value:
+        return '&(TestTokenStringValue){0, NULL}'
+
+    token_handlers = []
+    for inner_token in value:
+        inner_type = inner_token.get("type")
+        inner_value = inner_token.get("value")
+
+        if inner_type == "i64":
+            handler = "test_integer_value"
+            val_init = f'&(TestIntegerValue){{INTEGER_I64, {inner_value}}}'
+        elif inner_type == "i32":
+            handler = "test_integer_value"
+            val_init = f'&(TestIntegerValue){{INTEGER_I32, {inner_value}}}'
+        elif inner_type == "f64":
+            handler = "test_double_value"
+            val_init = f'&(double){{{inner_value}}}'
+        elif inner_type == "f32":
+            handler = "test_float_value"
+            val_init = f'&(float){{{inner_value}}}'
+        elif inner_type == "char":
+            handler = "test_character_value"
+            val_init = f'&(uint8_t){{{ord(inner_value)}}}' # type: ignore
+        elif inner_type == "string":
+            handler = "test_string_value"
+            val_init = f'&SLS_STR("{c_string_literal(inner_value)}")' # type: ignore
+        elif inner_type == "identifier":
+            handler = "test_identifier_value"
+            val_init = f'&(TestIdentifierValue){{FALSE, SLS_STR("{inner_value}")}}'
+        elif inner_type == "identifier_literal":
+            handler = "test_identifier_value"
+            val_init = f'&(TestIdentifierValue){{TRUE, SLS_STR("{inner_value}")}}'
+        elif inner_type == "bool":
+            handler = "test_boolean_value"
+            val_init = f'&(Boolean){{{"TRUE" if inner_value else "FALSE"}}}'
+        elif inner_type == "error":
+            handler = "test_for_error"
+            val_init = f'&SLS_STR("{c_string_literal(inner_value)}")' # type: ignore
+        elif inner_type == "token_string":
+            handler = "test_token_string_value"
+            val_init = _token_string_value_init(inner_token.get("value", []))
+        # Add other types as needed
+        else:
+            raise ValueError(f'Unhandled token type in nested token string: {inner_type}')
+
+        token_handlers.append(
+            f'{{(Boolean (*)(LexerTest *, LexerResult, size_t, void *)){handler}, '
+            f'{val_init}}}'
+        )
+
+    tokens_array = f'(TestTokenStringToken[]){{{", ".join(token_handlers)}}}'
+    return f'&(TestTokenStringValue){{{len(value)}, {tokens_array}}}'
+
 def token_to_c_call(token: dict, idx_var="i") -> str:
     """Generate a C 'test_*_value' call based on token type."""
     return f"if ({_token_to_c_call(token, idx_var)}) return test.result;"
 
 def generate_c_test(test: dict) -> str:
     """Convert a single YAML test entry to a C test function."""
-    name = sanitize_name(test["name"])
+    name = test["name"]
+    c_name = sanitize_name(name)
     code = c_string_literal(test["code"])
     tokens = test.get("tokens", [])
 
     # Function header
-    c_code = [f"static TestResult {name}() {{",
-              f'    LexerTest test = start_up_test("{name}", "{code}");',
+    c_code = [f"static TestResult {c_name}() {{",
+              f'    LexerTest test = start_up_test(SLS_STR("{name}"), SLS_STR("{code}"));',
               "    LexerResult result = lexical_analysis(&test.lexer_info);",
               "    if (result.type == SLS_ERROR) return error_fail_test(&test, result, result.error);",
               "    size_t i = 0;"]