feat add func call and rewrite codes

ccompiler/frontend/lexer/lexer.h

@@ -2,13 +2,17 @@
 #define __LEXER_H__
 
 #include "token.h"
+#ifndef LEXER_MAX_TOKEN_SIZE 
 #define LEXER_MAX_TOKEN_SIZE 63
+#endif
+#ifndef LEXER_BUFFER_SIZE 
 #define LEXER_BUFFER_SIZE 4095
+#endif
 
 typedef int (*lexer_sread_fn)(void *dst_buf, int dst_size,
         int elem_size, int count, void *stream);
 
-struct Lexer {
+typedef struct lexer {
     int line;
     int index;
     // const char current_file_name[LEXER_BUFFER_SIZE+1];
@@ -19,22 +23,15 @@ struct Lexer {
 
     lexer_sread_fn sread;
     void* stream;
-};
+} lexer_t;
 
-struct Token {
-    enum TokenType type;
-    struct TokenConstant constant;
-};
-
-void init_lexer(struct Lexer* lexer, const char* file_name, void* stream,
+void init_lexer(lexer_t* lexer, const char* file_name, void* stream,
     lexer_sread_fn sread);
 
-// 
-void get_token(struct Lexer* lexer, struct Token* token);
+// pure token getter it will included empty token like TOKEN_FLUSH
+void get_token(lexer_t* lexer, tok_t* token);
 
 // get_token maybe got invalid (with parser as TOKEN_FLUSH)
-void get_valid_token(struct Lexer* lexer, struct Token* token);
-
-const char* get_token_name(enum TokenType token);
+void get_valid_token(lexer_t* lexer, tok_t* token);
 
 #endif