/*
 * 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;
} regex_class_t;

typedef enum {
	REGEX_QUANTIFIER_NONE,
	REGEX_QUANTIFIER_STAR,
	REGEX_QUANTIFIER_PLUS,
	REGEX_QUANTIFIER_QMARK,
} regex_quantifier_t;

typedef enum {
	REGEX_TERM_WILDCARD,
	REGEX_TERM_CLASS,
	REGEX_TERM_LITERAL,
	REGEX_TERM_SUBEXPR,
	REGEX_TERM_EMPTY,
} regex_term_type_t;

struct _regex_term;
typedef struct {
	int count, capacity;
	struct _regex_term *contents;
} regex_sequence_t;

typedef struct {
	int count, capacity;
	regex_sequence_t *contents;
} regex_t;

typedef struct _regex_term {
	regex_quantifier_t quantifier;
	regex_term_type_t type;
	union {
		regex_class_t class;
		char literal;
		regex_t subexpr;
	};
} regex_term_t;

void regex_free(const regex_t *t);
void regex_class_free(const regex_class_t *c);

#endif