From fd80b5f69dc9a14f970395154422ef3db99a287f Mon Sep 17 00:00:00 2001
From: Kyler <yrea2001@gmail.com>
Date: Fri, 28 Nov 2025 00:02:13 -0700
Subject: [PATCH] Lexing in REPL

---
 SLS_C/include/sls/main.h |  1 +
 SLS_C/src/main.c         |  8 ++++++--
 SLS_C/src/repl.c         | 39 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 46 insertions(+), 2 deletions(-)

diff --git a/SLS_C/include/sls/main.h b/SLS_C/include/sls/main.h
index 819596c..7f92e2f 100644
--- a/SLS_C/include/sls/main.h
+++ b/SLS_C/include/sls/main.h
@@ -30,5 +30,6 @@
     #define COMPILER_VER 0
 #endif
 
+void print_version();
 
 #endif // SLS_MAIN_H
diff --git a/SLS_C/src/main.c b/SLS_C/src/main.c
index e4bf89f..0b12858 100644
--- a/SLS_C/src/main.c
+++ b/SLS_C/src/main.c
@@ -11,6 +11,11 @@
 #include "sls/bool.h"
 #include "sls/repl.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);
+}
+
 int main(int argc, char *argv[]) {
     Boolean version = FALSE;
     Boolean file = FALSE;
@@ -25,8 +30,7 @@ int main(int argc, char *argv[]) {
     }
 
     if (version) {
-        printf("YREA SLS (" SLS_NAME ") " SLS_VER " (" GIT_COMMIT_HASH ")\n");
-        printf("Compiled with " COMPILER_NAME " %d at " __DATE__ " " __TIME__ "\n", COMPILER_VER);
+        print_version();
         return 0;
     } else if (file) {
         return 1;
diff --git a/SLS_C/src/repl.c b/SLS_C/src/repl.c
index 152c5da..8c39e4c 100644
--- a/SLS_C/src/repl.c
+++ b/SLS_C/src/repl.c
@@ -3,11 +3,50 @@
 // REPL
 // November 2025
 
+#include <stddef.h>
+#include <stdio.h>
+#include <string.h>
+
 #include "sls/repl.h"
+#include "sls/main.h"
+#include "sls/errors.h"
+#include "sls/lexer.h"
+#include "sls/string.h"
+
+static const size_t BUFFER_SIZE = 256;
+static const SlsStr REPL_FILE_NAME = SLS_STR_CONST("<STDIN>");
 
 int repl(int argc, char *argv[]) {
     (void)argc;
     (void)argv;
 
+    print_version();
+    printf("===== YREA SLS REPL =====\n");
+    printf("Type `#exit` to exit.\n");
+
+    LexerInfo lexer_info;
+    char buf[BUFFER_SIZE];
+    while (fgets(buf, sizeof buf, stdin)) {
+        size_t len = strlen(buf);
+        if (len && buf[len - 1] == '\n') buf[len - 1] = '\0';
+        if (strncmp("#exit", buf, BUFFER_SIZE) == 0) return 0;
+        SlsStr code = sls_str_malloc(buf, BUFFER_SIZE);
+        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);
+        } else {
+            LexerTokenResult *head = result.result;
+            while (head) {
+                if (head->type == SLS_ERROR)
+                    printf("%s\n", head->error.message.str);
+                else
+                    printf("%s\n", TOKEN_TYPES_NAMES[head->result.type]);
+                head = head->next;
+            }
+        }
+        sls_str_free(&code);
+    }
+
     return 1;
 }