/* retoor <retoor@molodetz.nl> */
#ifndef LOREG_LEXER_H
#define LOREG_LEXER_H

#include <stddef.h>
#include <stdbool.h>

typedef enum {
    TOKEN_CHAR,
    TOKEN_DOT,
    TOKEN_STAR,
    TOKEN_PLUS,
    TOKEN_QUESTION,
    TOKEN_PIPE,
    TOKEN_LPAREN,
    TOKEN_RPAREN,
    TOKEN_LBRACKET,
    TOKEN_RBRACKET,
    TOKEN_CARET,
    TOKEN_DOLLAR,
    TOKEN_LBRACE,
    TOKEN_RBRACE,
    TOKEN_BACKSLASH,
    TOKEN_DASH,
    TOKEN_CLASS_DIGIT,
    TOKEN_CLASS_WORD,
    TOKEN_CLASS_SPACE,
    TOKEN_CLASS_NDIGIT,
    TOKEN_CLASS_NWORD,
    TOKEN_CLASS_NSPACE,
    TOKEN_EOF
} token_type_t;

typedef struct {
    token_type_t type;
    char value;
    size_t position;
} token_t;

typedef struct {
    const char *pattern;
    size_t length;
    size_t position;
    bool in_bracket;
} lexer_t;

void lexer_init(lexer_t *lexer, const char *pattern);
token_t lexer_next(lexer_t *lexer);
token_t lexer_peek(lexer_t *lexer);
bool lexer_eof(lexer_t *lexer);

#endif