/*
 * Copyright (c) Camden Dixie O'Brien
 * SPDX-License-Identifier: AGPL-3.0-only
 */

#ifndef REGEX_H
#define REGEX_H

#include <stdbool.h>

typedef struct {
	bool negated;
	int count, capacity;
	char *contents;
} class_t;

typedef enum {
	QUANTIFIER_NONE,
	QUANTIFIER_ZERO_OR_MORE,
	QUANTIFIER_ONE_OR_MORE,
	QUANTIFIER_ZERO_OR_ONE,
} quantifier_t;

typedef enum {
	TERM_TYPE_WILDCARD,
	TERM_TYPE_CLASS,
	TERM_TYPE_LITERAL,
	TERM_TYPE_REGEX,
} term_type_t;

struct _term;
typedef struct {
	int len, capacity;
	struct _term *contents;
} sequence_t;

typedef struct _regex {
	sequence_t sequence;
	struct _regex *alternative;
} regex_t;

typedef struct _term {
	quantifier_t quantifier;
	term_type_t type;
	union {
		class_t class;
		char literal;
		regex_t regex;
	};
} term_t;

void regex_free_children(regex_t *r);

#endif