lib/lua/src/llimits.h


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/*
** $Id: llimits.h,v 1.69.1.1 2007/12/27 13:02:25 roberto Exp $
** Limits, basic types, and some other `installation-dependent' definitions
** See Copyright Notice in lua.h
*/

#ifndef llimits_h
#define llimits_h


#include <limits.h>
#include <stddef.h>


#include "lua.h"


typedef LUAI_UINT32 lu_int32;

typedef LUAI_UMEM lu_mem;

typedef LUAI_MEM l_mem;


/* chars used as small naturals (so that `char' is reserved for characters) */
typedef unsigned char lu_byte;


#define MAX_SIZET	((size_t)(~(size_t)0)-2)

#define MAX_LUMEM	((lu_mem)(~(lu_mem)0)-2)


#define MAX_INT (INT_MAX-2)  /* maximum value of an int (-2 for safety) */

/*
** conversion of pointer to integer
** this is for hashing only; there is no problem if the integer
** cannot hold the whole pointer value
*/
#define IntPoint(p)  ((unsigned int)(lu_mem)(p))


/* type to ensure maximum alignment */
typedef LUAI_USER_ALIGNMENT_T L_Umaxalign;


/* result of a `usual argument conversion' over lua_Number */
typedef LUAI_UACNUMBER l_uacNumber;


/* internal assertions for in-house debugging */
#ifdef lua_assert

#define check_exp(c,e)		(lua_assert(c), (e))
#define api_check(l,e)		lua_assert(e)

#else

#define lua_assert(c)		((void)0)
#define check_exp(c,e)		(e)
#define api_check		luai_apicheck

#endif


#ifndef UNUSED
#define UNUSED(x)	((void)(x))	/* to avoid warnings */
#endif


#ifndef cast
#define cast(t, exp)	((t)(exp))
#endif

#define cast_byte(i)	cast(lu_byte, (i))
#define cast_num(i)	cast(lua_Number, (i))
#define cast_int(i)	cast(int, (i))


/*
** type for virtual-machine instructions
** must be an unsigned with (at least) 4 bytes (see details in lopcodes.h)
*/
typedef lu_int32 Instruction;


/* maximum stack for a Lua function */
#define MAXSTACK	250


/* minimum size for the string table (must be power of 2) */
#ifndef MINSTRTABSIZE
#define MINSTRTABSIZE	32
#endif


/* minimum size for string buffer */
#ifndef LUA_MINBUFFER
#define LUA_MINBUFFER	32
#endif


#ifndef lua_lock
#define lua_lock(L)     ((void) 0) 
#define lua_unlock(L)   ((void) 0)
#endif

#ifndef luai_threadyield
#define luai_threadyield(L)     {lua_unlock(L); lua_lock(L);}
#endif


/*
** macro to control inclusion of some hard tests on stack reallocation
*/ 
#ifndef HARDSTACKTESTS
#define condhardstacktests(x)	((void)0)
#else
#define condhardstacktests(x)	x
#endif

#endif
/*
Minetest
Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.

This program 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 Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/


#include "lua_api/l_craft.h"
#include "lua_api/l_internal.h"
#include "lua_api/l_item.h"
#include "common/c_converter.h"
#include "common/c_content.h"
#include "server.h"
#include "craftdef.h"

struct EnumString ModApiCraft::es_CraftMethod[] =
{
	{CRAFT_METHOD_NORMAL, "normal"},
	{CRAFT_METHOD_COOKING, "cooking"},
	{CRAFT_METHOD_FUEL, "fuel"},
	{0, NULL},
};


// helper for register_craft
bool ModApiCraft::readCraftRecipeShaped(lua_State *L, int index,
		int &width, std::vector<std::string> &recipe)
{
	if(index < 0)
		index = lua_gettop(L) + 1 + index;

	if(!lua_istable(L, index))
		return false;

	lua_pushnil(L);
	int rowcount = 0;
	while(lua_next(L, index) != 0){
		int colcount = 0;
		// key at index -2 and value at index -1
		if(!lua_istable(L, -1))
			return false;
		int table2 = lua_gettop(L);
		lua_pushnil(L);
		while(lua_next(L, table2) != 0){
			// key at index -2 and value at index -1
			if(!lua_isstring(L, -1))
				return false;
			recipe.push_back(lua_tostring(L, -1));
			// removes value, keeps key for next iteration
			lua_pop(L, 1);
			colcount++;
		}
		if(rowcount == 0){
			width = colcount;
		} else {
			if(colcount != width)
				return false;
		}
		// removes value, keeps key for next iteration
		lua_pop(L, 1);
		rowcount++;
	}
	return width != 0;
}

// helper for register_craft
bool ModApiCraft::readCraftRecipeShapeless(lua_State *L, int index,
		std::vector<std::string> &recipe)
{
	if(index < 0)
		index = lua_gettop(L) + 1 + index;

	if(!lua_istable(L, index))
		return false;

	lua_pushnil(L);
	while(lua_next(L, index) != 0){
		// key at index -2 and value at index -1
		if(!lua_isstring(L, -1))
			return false;
		recipe.push_back(lua_tostring(L, -1));
		// removes value, keeps key for next iteration
		lua_pop(L, 1);
	}
	return true;
}

// helper for register_craft
bool ModApiCraft::readCraftReplacements(lua_State *L, int index,
		CraftReplacements &replacements)
{
	if(index < 0)
		index = lua_gettop(L) + 1 + index;

	if(!lua_istable(L, index))
		return false;

	lua_pushnil(L);
	while(lua_next(L, index) != 0){
		// key at index -2 and value at index -1
		if(!lua_istable(L, -1))
			return false;
		lua_rawgeti(L, -1, 1);
		if(!lua_isstring(L, -1))
			return false;
		std::string replace_from = lua_tostring(L, -1);
		lua_pop(L, 1);
		lua_rawgeti(L, -1, 2);
		if(!lua_isstring(L, -1))
			return false;
		std::string replace_to = lua_tostring(L, -1);
		lua_pop(L, 1);
		replacements.pairs.push_back(
				std::make_pair(replace_from, replace_to));
		// removes value, keeps key for next iteration
		lua_pop(L, 1);
	}
	return true;
}
// register_craft({output=item, recipe={{item00,item10},{item01,item11}})
int ModApiCraft::l_register_craft(lua_State *L)
{
	NO_MAP_LOCK_REQUIRED;
	//infostream<<"register_craft"<<std::endl;
	luaL_checktype(L, 1, LUA_TTABLE);
	int table = 1;

	// Get the writable craft definition manager from the server
	IWritableCraftDefManager *craftdef =
			getServer(L)->getWritableCraftDefManager();

	std::string type = getstringfield_default(L, table, "type", "shaped");

	/*
		CraftDefinitionShaped
	*/
	if(type == "shaped"){
		std::string output = getstringfield_default(L, table, "output", "");
		if(output == "")
			throw LuaError("Crafting definition is missing an output");

		int width = 0;
		std::vector<std::string> recipe;
		lua_getfield(L, table, "recipe");
		if(lua_isnil(L, -1))
			throw LuaError("Crafting definition is missing a recipe"
					" (output=\"" + output + "\")");
		if(!readCraftRecipeShaped(L, -1, width, recipe))
			throw LuaError("Invalid crafting recipe"
					" (output=\"" + output + "\")");

		CraftReplacements replacements;
		lua_getfield(L, table, "replacements");
		if(!lua_isnil(L, -1))
		{
			if(!readCraftReplacements(L, -1, replacements))
				throw LuaError("Invalid replacements"
						" (output=\"" + output + "\")");
		}

		CraftDefinition *def = new CraftDefinitionShaped(
				output, width, recipe, replacements);
		craftdef->registerCraft(def, getServer(L));
	}
	/*
		CraftDefinitionShapeless
	*/
	else if(type == "shapeless"){
		std::string output = getstringfield_default(L, table, "output", "");
		if(output == "")
			throw LuaError("Crafting definition (shapeless)"
					" is missing an output");

		std::vector<std::string> recipe;
		lua_getfield(L, table, "recipe");
		if(lua_isnil(L, -1))
			throw LuaError("Crafting definition (shapeless)"
					" is missing a recipe"
					" (output=\"" + output + "\")");
		if(!readCraftRecipeShapeless(L, -1, recipe))
			throw LuaError("Invalid crafting recipe"
					" (output=\"" + output + "\")");

		CraftReplacements replacements;
		lua_getfield(L, table, "replacements");
		if(!lua_isnil(L, -1))
		{
			if(!readCraftReplacements(L, -1, replacements))
				throw LuaError("Invalid replacements"
						" (output=\"" + output + "\")");
		}

		CraftDefinition *def = new CraftDefinitionShapeless(
				output, recipe, replacements);
		craftdef->registerCraft(def, getServer(L));
	}
	/*
		CraftDefinitionToolRepair
	*/
	else if(type == "toolrepair"){
		float additional_wear = getfloatfield_default(L, table,
				"additional_wear", 0.0);

		CraftDefinition *def = new CraftDefinitionToolRepair(
				additional_wear);
		craftdef->registerCraft(def, getServer(L));
	}
	/*
		CraftDefinitionCooking
	*/
	else if(type == "cooking"){
		std::string output = getstringfield_default(L, table, "output", "");
		if(output == "")
			throw LuaError("Crafting definition (cooking)"
					" is missing an output");

		std::string recipe = getstringfield_default(L, table, "recipe", "");
		if(recipe == "")
			throw LuaError("Crafting definition (cooking)"
					" is missing a recipe"
					" (output=\"" + output + "\")");

		float cooktime = getfloatfield_default(L, table, "cooktime", 3.0);

		CraftReplacements replacements;
		lua_getfield(L, table, "replacements");
		if(!lua_isnil(L, -1))
		{
			if(!readCraftReplacements(L, -1, replacements))
				throw LuaError("Invalid replacements"
						" (cooking output=\"" + output + "\")");
		}

		CraftDefinition *def = new CraftDefinitionCooking(
				output, recipe, cooktime, replacements);
		craftdef->registerCraft(def, getServer(L));
	}
	/*
		CraftDefinitionFuel
	*/
	else if(type == "fuel"){
		std::string recipe = getstringfield_default(L, table, "recipe", "");
		if(recipe == "")
			throw LuaError("Crafting definition (fuel)"
					" is missing a recipe");

		float burntime = getfloatfield_default(L, table, "burntime", 1.0);

		CraftReplacements replacements;
		lua_getfield(L, table, "replacements");
		if(!lua_isnil(L, -1))
		{
			if(!readCraftReplacements(L, -1, replacements))
				throw LuaError("Invalid replacements"
						" (fuel recipe=\"" + recipe + "\")");
		}

		CraftDefinition *def = new CraftDefinitionFuel(
				recipe, burntime, replacements);
		craftdef->registerCraft(def, getServer(L));
	}
	else
	{
		throw LuaError("Unknown crafting definition type: \"" + type + "\"");
	}

	lua_pop(L, 1);
	return 0; /* number of results */
}

// get_craft_result(input)
int ModApiCraft::l_get_craft_result(lua_State *L)
{
	NO_MAP_LOCK_REQUIRED;

	int input_i = 1;
	std::string method_s = getstringfield_default(L, input_i, "method", "normal");
	enum CraftMethod method = (CraftMethod)getenumfield(L, input_i, "method",
				es_CraftMethod, CRAFT_METHOD_NORMAL);
	int width = 1;
	lua_getfield(L, input_i, "width");
	if(lua_isnumber(L, -1))
		width = luaL_checkinteger(L, -1);
	lua_pop(L, 1);
	lua_getfield(L, input_i, "items");
	std::vector<ItemStack> items = read_items(L, -1,getServer(L));
	lua_pop(L, 1); // items

	IGameDef *gdef = getServer(L);
	ICraftDefManager *cdef = gdef->cdef();
	CraftInput input(method, width, items);
	CraftOutput output;
	std::vector<ItemStack> output_replacements;
	bool got = cdef->getCraftResult(input, output, output_replacements, true, gdef);
	lua_newtable(L); // output table
	if (got) {
		ItemStack item;
		item.deSerialize(output.item, gdef->idef());
		LuaItemStack::create(L, item);
		lua_setfield(L, -2, "item");
		setintfield(L, -1, "time", output.time);
		push_items(L, output_replacements);
		lua_setfield(L, -2, "replacements");
	} else {
		LuaItemStack::create(L, ItemStack());
		lua_setfield(L, -2, "item");
		setintfield(L, -1, "time", 0);
		lua_newtable(L);
		lua_setfield(L, -2, "replacements");
	}
	lua_newtable(L); // decremented input table
	lua_pushstring(L, method_s.c_str());
	lua_setfield(L, -2, "method");
	lua_pushinteger(L, width);
	lua_setfield(L, -2, "width");
	push_items(L, input.items);
	lua_setfield(L, -2, "items");
	return 2;
}


static void push_craft_recipe(lua_State *L, IGameDef *gdef,
		const CraftDefinition *recipe,
		const CraftOutput &tmpout)
{
	CraftInput input = recipe->getInput(tmpout, gdef);
	CraftOutput output = recipe->getOutput(input, gdef);

	lua_newtable(L); // items
	std::vector<ItemStack>::const_iterator iter = input.items.begin();
	for (u16 j = 1; iter != input.items.end(); iter++, j++) {
		if (iter->empty())
			continue;
		lua_pushstring(L, iter->name.c_str());
		lua_rawseti(L, -2, j);
	}
	lua_setfield(L, -2, "items");
	setintfield(L, -1, "width", input.width);
	switch (input.method) {
	case CRAFT_METHOD_NORMAL:
		lua_pushstring(L, "normal");
		break;
	case CRAFT_METHOD_COOKING:
		lua_pushstring(L, "cooking");
		break;
	case CRAFT_METHOD_FUEL:
		lua_pushstring(L, "fuel");
		break;
	default:
		lua_pushstring(L, "unknown");
	}
	lua_setfield(L, -2, "type");
	lua_pushstring(L, output.item.c_str());
	lua_setfield(L, -2, "output");
}

static void push_craft_recipes(lua_State *L, IGameDef *gdef,
		const std::vector<CraftDefinition*> &recipes,
		const CraftOutput &output)
{
	lua_createtable(L, recipes.size(), 0);

	if (recipes.empty()) {
		lua_pushnil(L);
		return;
	}

	std::vector<CraftDefinition*>::const_iterator it = recipes.begin();
	for (unsigned i = 0; it != recipes.end(); ++it) {
		lua_newtable(L);
		push_craft_recipe(L, gdef, *it, output);
		lua_rawseti(L, -2, ++i);
	}
}


// get_craft_recipe(result item)
int ModApiCraft::l_get_craft_recipe(lua_State *L)
{
	NO_MAP_LOCK_REQUIRED;

	std::string item = luaL_checkstring(L, 1);
	Server *server = getServer(L);
	CraftOutput output(item, 0);
	std::vector<CraftDefinition*> recipes = server->cdef()
			->getCraftRecipes(output, server, 1);

	lua_createtable(L, 1, 0);

	if (recipes.empty()) {
		lua_pushnil(L);
		lua_setfield(L, -2, "items");
		setintfield(L, -1, "width", 0);
		return 1;
	}
	push_craft_recipe(L, server, recipes[0], output);
	return 1;
}

// get_all_craft_recipes(result item)
int ModApiCraft::l_get_all_craft_recipes(lua_State *L)
{
	NO_MAP_LOCK_REQUIRED;

	std::string item = luaL_checkstring(L, 1);
	Server *server = getServer(L);
	CraftOutput output(item, 0);
	std::vector<CraftDefinition*> recipes = server->cdef()
			->getCraftRecipes(output, server);

	push_craft_recipes(L, server, recipes, output);
	return 1;
}

void ModApiCraft::Initialize(lua_State *L, int top)
{
	API_FCT(get_all_craft_recipes);
	API_FCT(get_craft_recipe);
	API_FCT(get_craft_result);
	API_FCT(register_craft);
}