#ifndef AMALGAM_TOKENIZER_H
#define AMALGAM_TOKENIZER_H

#include "buffer_view.h"
#include "misc.h"

#define TOKENIZER_OK 0
#define TOKENIZER_UNEXPECTED_TOKEN -1

typedef enum {
    TOK_NONE,
    TOK_END_OF_FILE,
    TOK_IDENTIFIER,
    TOK_CONST,
    TOK_VAR,
    TOK_EQUALS,
    TOK_OPEN_PAREN,
    TOK_CLOSING_PAREN,
    TOK_OPEN_BRACE,
    TOK_CLOSING_BRACE
} Token;

typedef struct {
    BufferView code;
    int index;
    int prev_index;
    int line;
    
    union {
        BufferView identifier;
    } value;
} Tokenizer;

CHECK_RESULT int tokenizer_init(Tokenizer *self, BufferView code);

CHECK_RESULT int tokenizer_next(Tokenizer *self, Token *token);
CHECK_RESULT int tokenizer_accept(Tokenizer *self, Token expected_token);
/* 
   @result is set to 0 if the next token is equal to @expected_token,
   otherwise @result is set to 1
*/
CHECK_RESULT int tokenizer_consume_if(Tokenizer *self, Token expected_token, bool *result);
void tokenizer_print_error(Tokenizer *self, const char *fmt, ...);

#endif