token.h

/*-
 * Copyright (c) 2020 Abhinav Upadhyay <er.abhinav.upadhyay@gmail.com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef TOKEN_H
#define TOKEN_H

typedef enum token_type {
    CHAR,
    PLUS,
    QUESTION,
    PIPE,
    CAT, //not a real token but represents a concat operator
    LPAREN,
    RPAREN,
    STAR,
    LBRACKET,
    RBRACKET,
    ILLEGAL,
    END_OF_FILE
} token_type;

static const char *token_names[] = {
    "CHAR",
    "PLUS",
    "QUESTION",
    "PIPE",
    "CAT",
    "LPAREN",
    "RPAREN",
    "STAR",
    "LBRACKET",
    "RBRACKET",
    "ILLEGAL",
    "EOF"
};

typedef struct token_t {
    char *literal;
    token_type type;
} token_t;

#define get_token_name(tok_type) token_names[tok_type]
token_t *token_copy(token_t *);
void token_free(token_t *);

#endif