Updated the project structure, and modified the Makefile to hopefully be future proof so I can freely make sub-folders in the src/ folder and not have to worry about breaking the Makefile.

src/token.h

@@ -0,0 +1,57 @@
+#ifndef TOKEN_H
+#define TOKEN_H
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#define TOKENTYPE_MAPPINGS_COUNT 34
+
+typedef enum {
+    //Single-character tokens
+    LParen, RParen,
+    LBrace, RBrace,
+    Comma,
+    Dot,
+    Minus, Plus,
+    Semicolon,
+    Slash, Star,
+    //One or two character tokens
+    Bang, Bang_Equal,
+    Equal, Equal_Equal,
+    Greater, Greater_Equal,
+    Less, Less_Equal,
+    //Literals
+    Identifier,
+    String,
+    Number,
+    //Keywords
+    AND, CLASS, ELSE, FALSE, FUN,
+    FOR, IF, NIL, OR, PRINT, RETURN,
+    SUPER, THIS, TRUE, VAR, WHILE,
+
+    EndOF
+} TokenType;
+
+typedef struct {
+    const char* lexeme;
+    TokenType type;
+} KeyValuePair;
+
+typedef struct {
+    TokenType type;
+    const char* lexeme;
+    const void* literal;
+    int line;
+} Token;
+
+extern KeyValuePair TokenTypeMappings[TOKENTYPE_MAPPINGS_COUNT];
+
+//If the first parameter is NULL, the token creation will attempt to infer the lexeme from the TokenType.
+Token* CreateToken(const char*, void*, int, TokenType);
+char* GetTokenStringValue(Token*, int*);
+int GetTokenNumberValue(Token*, double*);
+void FreeToken(Token*);
+
+#endif