Added keyword token type

include/sync/lexer.h

@@ -23,6 +23,7 @@ typedef enum {
     TOKEN_RBRACKET,
     TOKEN_CHARACTER,
     TOKEN_STRING,
+    TOKEN_KEYWORD,
 } TokenType;
 
 typedef struct {

src/lexer.c

@@ -9,6 +9,32 @@
 #include "sync/types.h"
 #include "sync/lexer.h"
 
+const char* KEYWORDS[] = {
+    // Definitions and Declarations
+    "const", "enum", "fn", "let", "mut", "public", "static", "struct", "union",
+
+    // Control Flow
+    "break", "case", "continue", "default", "do", "else", "for", "if", "match",
+    "return", "switch", "while",
+
+    // Values
+    "False", "True",
+
+    // Types
+    "bool", "f32", "f64", "i8", "i16", "i32", "i64", "i128", "u8", "u16", "u32",
+    "u64", "u128", "void",
+
+    // Modules
+    "as", "import",
+
+    // Operators
+    "is", "sizeof",
+
+    // Reserved
+    "extern", "impl", "in", "move", "new", "self", "super", "trait", "tuple",
+    "type", "use", "where", "yeet",
+};
+
 void lexer_init(Lexer* lexer, const char* filename, const char* source) {
     lexer->filename = filename;
     lexer->source = source;
@@ -84,6 +110,16 @@ static char is_identifier_char(char c) {
     return isalnum(c) || c == '_';
 }
 
+static char is_keyword(Lexer* lexer, size_t start, size_t length) {
+    size_t num_keywords = sizeof(KEYWORDS) / sizeof(KEYWORDS[0]);
+    for (size_t i = 0; i < num_keywords; i++)
+        if (
+            strncmp(&lexer->source[start], KEYWORDS[i], length) == 0 &&
+            strlen(KEYWORDS[i]) == length
+            ) return 1;
+    return 0;
+}
+
 static LexerResult lexer_result(Lexer* lexer, TokenType type, size_t start, size_t start_line) {
     TokenResult* result = (TokenResult*)malloc(sizeof(TokenResult));
     if (result == NULL)
@@ -181,6 +217,9 @@ static LexerResult lexer_next(Lexer* lexer) {
     // Identifiers
     if (is_identifier_start(c)) {
         while (is_identifier_char(peek(lexer))) advance(lexer);
+        size_t length = lexer->pos - start;
+        if (is_keyword(lexer, start, length))
+            return lexer_result(lexer, TOKEN_KEYWORD, start, start_line);
         return lexer_result(lexer, TOKEN_IDENTIFIER, start, start_line);
     }
 

src/main.c

@@ -13,7 +13,7 @@ const char* TOKEN_TYPES[] = {
     "EOF", "IDENTIFIER", "NUMBER", "OPERATOR",
     "LPAREN", "RPAREN", "SEMICOLON", "LBRACE",
     "RBRACE", "LBRACKET", "RBRACKET", "CHARACTER",
-    "STRING"
+    "STRING", "KEYWORD"
 };
 
 static void print_token(Token token) {