/*
 * Copyright (C) 2023 Johnny Richard
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
#ifndef LEXER_H
#define LEXER_H

#include "string_view.h"
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>

typedef enum
{
  TOKEN_NAME,
  TOKEN_OPAREN,
  TOKEN_CPAREN,
  TOKEN_COLON,
  TOKEN_SEMICOLON,
  TOKEN_OCURLY,
  TOKEN_CCURLY,
  TOKEN_NUMBER,
  TOKEN_PLUS,
  TOKEN_MINUS,
  TOKEN_STAR,
  TOKEN_SLASH,
  TOKEN_EQUAL,
  TOKEN_EOF,
  TOKEN_UNKNOWN
} token_kind_t;

typedef struct token_t
{
  token_kind_t kind;
  string_view_t value;
  char *filepath;
  uint32_t row;
  uint32_t col;
  uint32_t bol;
} token_t;

typedef struct lexer_t
{
  char *filepath;
  char *src;
  size_t srclen;
  uint32_t cur;
  uint32_t row;
  uint32_t bol;
} lexer_t;

void
lexer_init(lexer_t *lexer, char *filepath);

void
lexer_next_token(lexer_t *lexer, token_t *token);

void
lexer_load_file_contents(lexer_t *lexer);

char
lexer_current_char(lexer_t *lexer);

bool
lexer_is_eof(lexer_t *lexer);

bool
lexer_is_not_eof(lexer_t *lexer);

void
lexer_drop_char(lexer_t *lexer);

void
lexer_step_back_to(lexer_t *lexer, token_t *token);

void
lexer_peek_next_token(lexer_t *lexer, token_t *token);

char *
token_kind_to_str(token_kind_t kind);

#endif /* LEXER_H */