diff --git a/include/pocketpy/compiler/compiler.h b/include/pocketpy/compiler/compiler.h
new file mode 100644
index 00000000..8622a422
--- /dev/null
+++ b/include/pocketpy/compiler/compiler.h
@@ -0,0 +1,15 @@
+#pragma once
+
+#include "pocketpy/common/vector.h"
+#include "pocketpy/compiler/lexer.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+Error* pk_compile(pk_SourceData_ src);
+
+
+#ifdef __cplusplus
+}
+#endif
\ No newline at end of file
diff --git a/include/pocketpy/compiler/lexer.h b/include/pocketpy/compiler/lexer.h
index 36b8bfcd..ceeca13d 100644
--- a/include/pocketpy/compiler/lexer.h
+++ b/include/pocketpy/compiler/lexer.h
@@ -35,8 +35,15 @@ typedef enum TokenIndex{
     TK__COUNT__
 } TokenIndex;
 
+enum TokenValueIndex{
+    TokenValue_EMPTY = 0,
+    TokenValue_I64 = 1,
+    TokenValue_F64 = 2,
+    TokenValue_STR = 3,
+};
+
 typedef struct TokenValue {
-    int index;  // 0: empty
+    enum TokenValueIndex index;  // 0: empty
     union {
         int64_t _i64;   // 1
         double _f64;    // 2
@@ -44,11 +51,6 @@ typedef struct TokenValue {
     };
 } TokenValue;
 
-#define TokenValue_EMPTY 0
-#define TokenValue_I64   1
-#define TokenValue_F64   2
-#define TokenValue_STR   3
-
 typedef struct Token {
     TokenIndex type;
     const char* start;
diff --git a/src/compiler/compiler.c b/src/compiler/compiler.c
new file mode 100644
index 00000000..9236623c
--- /dev/null
+++ b/src/compiler/compiler.c
@@ -0,0 +1,20 @@
+#include "pocketpy/compiler/compiler.h"
+
+Error* pk_compile(pk_SourceData_ src){
+    c11_array/*T=Token*/ tokens;
+    Error* err = pk_Lexer__process(src, &tokens);
+    if(err) return err;
+
+    Token* data = (Token*)tokens.data;
+    printf("%s\n", py_Str__data(&src->filename));
+    for(int i = 0; i < tokens.count; i++) {
+        Token* t = data + i;
+        py_Str tmp;
+        py_Str__ctor2(&tmp, t->start, t->length);
+        printf("[%d] %s: %s\n", t->line, pk_TokenSymbols[t->type], py_Str__data(&tmp));
+        py_Str__dtor(&tmp);
+    }
+
+    c11_array__dtor(&tokens);
+    return NULL;
+}
\ No newline at end of file
diff --git a/src/compiler/lexer.c b/src/compiler/lexer.c
index e30db95b..dc4478a8 100644
--- a/src/compiler/lexer.c
+++ b/src/compiler/lexer.c
@@ -814,16 +814,16 @@ Error* pk_Lexer__process_and_dump(pk_SourceData_ src, py_Str* out) {
         }
         // visit token value
         switch(token->value.index){
-            case 0: break;
-            case 1:
+            case TokenValue_EMPTY: break;
+            case TokenValue_I64:
                 pk_SStream__write_char(&ss, 'I');
                 pk_SStream__write_int(&ss, token->value._i64);
                 break;
-            case 2:
+            case TokenValue_F64:
                 pk_SStream__write_char(&ss, 'F');
                 pk_SStream__write_float(&ss, token->value._f64, -1);
                 break;
-            case 3: {
+            case TokenValue_STR: {
                 pk_SStream__write_char(&ss, 'S');
                 c11_string sv = py_Str__sv(&token->value._str);
                 for(int i=0; i<sv.size; i++){