diff --git a/typedefs.h b/typedefs.h
index e69de29..825a7de 100644
--- a/typedefs.h
+++ b/typedefs.h
@@ -0,0 +1,52 @@
+// identifier
+#define ID 101
+// type names
+#define T_INTEGER 201
+#define T_ADDRESS 202
+#define T_BOOLEAN 203
+#define T_CHARACTER 204
+#define T_STRING 205
+// constants (literals)
+#define C_INTEGER 301
+#define C_NULL 302
+#define C_CHARACTER 303
+#define C_STRING 304
+#define C_TRUE 305
+#define C_FALSE 306
+// other keywords
+#define WHILE 401
+#define IF 402
+#define THEN 403
+#define ELSE 404
+#define TYPE 405
+#define FUNCTION 406
+#define RETURN 407
+#define EXTERNAL 408
+#define AS 409
+// punctuation - grouping
+#define L_PAREN 501
+#define R_PAREN 502
+#define L_BRACKET 503
+#define R_BRACKET 504
+#define L_BRACE 505
+#define R_BRACE 506
+// punctuation - other
+#define SEMI_COLON 507
+#define COLON 508
+#define COMMA 509
+#define ARROW 510
+// operators
+#define ADD 601
+#define SUB_OR_NEG 602
+#define MUL 603
+#define DIV 604
+#define REM 605
+#define LESS_THAN 606
+#define EQUAL_TO 607
+#define ASSIGN 608
+#define NOT 609
+#define AND 610
+#define OR 611
+#define DOT 612
+#define RESERVE 613
+#define RELEASE 614