Refactor lexer header to include additional token types and integer literal structure

SLS_C/include/sls/lexer.h

@@ -13,6 +13,7 @@ typedef enum {
     TOKEN_IDENTIFIER,
     TOKEN_INTEGER,
     TOKEN_FLOAT,
+    TOKEN_DOUBLE,
     TOKEN_STRING,
     TOKEN_BOOLEAN,
     TOKEN_ARRAY,
@@ -20,9 +21,25 @@ typedef enum {
     TOKEN_TYPE_TUPLE,
 } TokenType;
 
+typedef enum {
+    INTEGER_I64,
+    INTEGER_I32,
+    INTEGER_I16,
+    INTEGER_I8,
+    INTEGER_U64,
+    INTEGER_U32,
+    INTEGER_U16,
+    INTEGER_U8,
+} IntegerBuiltInType;
+
 typedef struct {
     const char *name;
     uint8_t is_literal;
 } Identifier;
 
+typedef struct {
+    uint64_t value;
+    IntegerBuiltInType type;
+} IntegerLiteral;
+
 #endif // SLS_LEXER_H