/*
 * Copyright (C) 2020 Weber Yann
 * 
 * This file is part of pyrpn.
 * 
 * pyrpn is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * any later version.
 * 
 * pyrpn is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with pyrpn.  If not, see <http://www.gnu.org/licenses/>.
 */
#ifndef __rpn_mutation__h__
#define __rpn_mutation__h__

#include <stddef.h>

#include "rpn_jit.h"

/**@defgroup mutation RPN expression mutation
 * @ingroup rpn
 */
/**@file rpn_mutation.h
 * @brief Contains structures and function to mutate RPN epxressions
 */


/**@brief Defines mutation actions types */
enum rpn_mutation_op_e {
	/**@brief Mutation action : delete a token */
	RPN_del,
	/**@brief Mutation action : add a token */
	RPN_add,
	/**@brief Mutation action : change a token */
	RPN_chg,
	/**@brief Mutation action : update a token (same type, different value) */
	RPN_upd
};

/**@brief Shortcut for struct @ref rpn_mutation_profile_s */
typedef struct rpn_mutation_profile_s rpn_mutation_profile_t;

/**@brief Stores mutation informations
 * @ingroup mutation
 */
struct rpn_mutation_profile_s
{
	/**@brief Size of @ref rpn_mutation_profile_s::mods attribute */
	size_t mods_sz;

	/**@brief Modification possibilities
	 *
	 * One value is picked up randomly from this list to determine
	 * the type of mutation : addition, deletion, modification, value change
	 */
	unsigned char mods[];
};

/**@brief Default mutation profile */
extern const rpn_mutation_profile_t rpn_default_mutprof;

/**@brief Shortcut for @ref rpn_expr_mutation_p with a @ref rpn_default_mutprof
 * @ingroup mutation */
rpn_expr_t* rpn_expr_mutation(rpn_expr_t *src, size_t mutations);

/**@brief Generate a new expression by applying mutations to a source
 * expression
 * @param src Source expression
 * @param mutations number of mutations
 * @param prof Mutation profile
 * @return A new instance of rpn_expr_t ready to be evaluate
 * @ingroup mutation
 */
rpn_expr_t* rpn_expr_mutation_p(rpn_expr_t *src, size_t mutations,
	const rpn_mutation_profile_t *prof);

#endif