/*
 * Token definitions.
 * Copyright (c) 2023-2024, Quinn Stephens and the OSMORA team.
 * Provided under the BSD 3-Clause license.
 */

#ifndef _LEXER_TOKEN_H
#define _LEXER_TOKEN_H

#include <stddef.h>
#include <stdint.h>
#include "hash.h"

typedef enum {
    TK_UNKNOWN,
    TK_EOF,

    TK_IDENTIFIER,
    TK_NUMBER,
    TK_STRING,
    TK_CHARACTER,

    /* Keywords */
    TK_TYPE,
    TK_ENUM,
    TK_STRUCT,

    /*
     * Operators.
     * NOTE: lex_oper() requires that TK_*_EQUALS
     *       immediately follows TK_*.
     */
    TK_PLUS,
    TK_PLUS_EQUALS,
    TK_PLUS_PLUS,
    TK_MINUS,
    TK_MINUS_EQUALS,
    TK_MINUS_MINUS,
    TK_ARROW,
    TK_STAR,
    TK_STAR_EQUALS,
    TK_SLASH,
    TK_SLASH_EQUALS,
    TK_PERCENT,
    TK_PERCENT_EQUALS,
    TK_EXCLAMATION,
    TK_EXCLAMATION_EQUALS,
    TK_LESS_THAN,
    TK_LESS_THAN_EQUALS,
    TK_SHIFT_LEFT,
    TK_SHIFT_LEFT_EQUALS,
    TK_GREATER_THAN,
    TK_GREATER_THAN_EQUALS,
    TK_SHIFT_RIGHT,
    TK_SHIFT_RIGHT_EQUALS,
    TK_CARET,
    TK_CARET_EQUALS,
    TK_AMPERSAND,
    TK_AMPERSAND_EQUALS,
    TK_PIPE,
    TK_PIPE_EQUALS,
    TK_TILDE,
    TK_EQUALS,

    /* Miscellaneous */
    TK_COMMA,
    TK_DOT,
    TK_COLON,
    TK_SEMICOLON,
    TK_LPAREN,
    TK_RPAREN,
    TK_LBRACE,
    TK_RBRACE,
    TK_LBRACK,
    TK_RBRACK
} token_kind_t;

struct token {
    token_kind_t kind;

    char *fname;
    int line, col;
    char *pos;
    size_t len;

    union {
        hash_t hash;
        uint64_t value;
    };
};

#endif /* !_LEXER_TOKEN_H */