/*
 * LuaeVariant.h -- Lua variant helper
 *
 * Copyright (c) 2013, 2014 David Demelier <markand@malikania.fr>
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#ifndef _LUAE_VARIANT_H_
#define _LUAE_VARIANT_H_

#include <lua.hpp>

/**
 * @class LuaeVariant
 * @brief A fake variant for Lua values
 *
 * This class is primarly used for copying Lua values without checking
 * the types, useful to pass data.
 */
class LuaeVariant {
private:
	union {
		lua_Number	 number;
		bool		 boolean;
	};

	int type;
	std::string str;
	std::vector<std::pair<LuaeVariant, LuaeVariant>> table;

public:
	/**
	 * Dump a value at the specific index.
	 *
	 * @param L the Lua state
	 * @param index the value
	 * @return a tree of values
	 */
	static LuaeVariant copy(lua_State *L, int index);

	/**
	 * Push a value to a state.
	 *
	 * @param L the Lua state
	 * @param value the value to push
	 */
	static void push(lua_State *L, const LuaeVariant &value);

	/**
	 * Default constructor (type nil)
	 */
	LuaeVariant();
};

#endif // !_LUAE_VARIANT_H_