/*
 * Copyright (C) 2025 Johnny Richard <johnny@johnnyrichard.com>
 *
 * SPDX-License-Identifier: LGPL-3.0-or-later
 *
 * This file is part of obe.
 *
 * obe is free software: you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation, either version 3 of the License, or (at your option)
 * any later version.
 *
 * obe 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 Lesser General Public License for more
 * details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with obe. If not, see <https://www.gnu.org/licenses/>.
 */
#ifndef OBE_LEXER_H
#define OBE_LEXER_H

#include <obe/string.h>
#include <stddef.h>

typedef enum obe_token_kind
{
    TOKEN_KW_RETURN,
    TOKEN_KW_FN,
    TOKEN_KW_BR,
    TOKEN_IDENT,
    TOKEN_LABEL,
    TOKEN_NUMBER,
    TOKEN_INT,
    TOKEN_EQ,
    TOKEN_COLON,
    TOKEN_SEMICOLON,
    TOKEN_LBRACE,
    TOKEN_RBRACE,
    TOKEN_EOF,
    TOKEN_UNKOWN
} obe_token_kind_t;

typedef struct obe_lexer_loc
{
    size_t offset;
    size_t lineoffset;
    size_t lineno;
} obe_lexer_loc_t;

typedef struct obe_token
{
    obe_token_kind_t kind;
    obe_string_t value;
    obe_lexer_loc_t loc;
} obe_token_t;

typedef struct obe_lexer
{
    char* filename;
    obe_string_t source;
    obe_lexer_loc_t loc;
} obe_lexer_t;

void
obe_lexer_init(obe_lexer_t* lexer, char* filename);

bool
obe_lexer_is_eof(obe_lexer_t* lexer);

char
obe_lexer_current_char(obe_lexer_t* lexer);

char
obe_lexer_next_char(obe_lexer_t* lexer);

void
obe_lexer_next_token(obe_lexer_t* lexer, obe_token_t* token);

char*
obe_token_to_cstr(obe_token_kind_t kind);

#endif /* OBE_LEXER_H */