C++ ItemStack::isKnown方法代码示例

// add_item(pos, itemstack or itemstring or table) -> ObjectRef or nil
// pos = {x=num, y=num, z=num}
int ModApiEnvMod::l_add_item(lua_State *L)
{
	GET_ENV_PTR;

	// pos
	//v3f pos = checkFloatPos(L, 1);
	// item
	ItemStack item = read_item(L, 2,getServer(L));
	if(item.empty() || !item.isKnown(getServer(L)->idef()))
		return 0;

	lua_pushcfunction(L, script_error_handler);
	int errorhandler = lua_gettop(L);

	// Use spawn_item to spawn a __builtin:item
	lua_getglobal(L, "core");
	lua_getfield(L, -1, "spawn_item");
	lua_remove(L, -2); // Remove core
	if(lua_isnil(L, -1))
		return 0;
	lua_pushvalue(L, 1);
	lua_pushstring(L, item.getItemString().c_str());

	PCALL_RESL(L, lua_pcall(L, 2, 1, errorhandler));

	lua_remove(L, errorhandler); // Remove error handler
	return 1;
}

// minetest.add_item(pos, itemstack or itemstring or table) -> ObjectRef or nil
// pos = {x=num, y=num, z=num}
int ModApiEnvMod::l_add_item(lua_State *L)
{
	GET_ENV_PTR;

	// pos
	//v3f pos = checkFloatPos(L, 1);
	// item
	ItemStack item = read_item(L, 2,getServer(L));
	if(item.empty() || !item.isKnown(getServer(L)->idef()))
		return 0;
	// Use minetest.spawn_item to spawn a __builtin:item
	lua_getglobal(L, "minetest");
	lua_getfield(L, -1, "spawn_item");
	if(lua_isnil(L, -1))
		return 0;
	lua_pushvalue(L, 1);
	lua_pushstring(L, item.getItemString().c_str());
	if(lua_pcall(L, 2, 1, 0))
		script_error(L, "error: %s", lua_tostring(L, -1));
	return 1;
	/*lua_pushvalue(L, 1);
	lua_pushstring(L, "__builtin:item");
	lua_pushstring(L, item.getItemString().c_str());
	return l_add_entity(L);*/
	/*// Do it
	ServerActiveObject *obj = createItemSAO(env, pos, item.getItemString());
	int objectid = env->addActiveObject(obj);
	// If failed to add, return nothing (reads as nil)
	if(objectid == 0)
		return 0;
	// Return ObjectRef
	objectrefGetOrCreate(L, obj);
	return 1;*/
}

	virtual bool getCraftResult(CraftInput &input, CraftOutput &output,
			std::vector<ItemStack> &output_replacement, bool decrementInput,
			IGameDef *gamedef) const
	{
		output.item = "";
		output.time = 0;

		// If all input items are empty, abort.
		bool all_empty = true;
		for (const auto &item : input.items) {
			if (!item.empty()) {
				all_empty = false;
				break;
			}
		}
		if (all_empty)
			return false;

		std::vector<std::string> input_names;
		input_names = craftGetItemNames(input.items, gamedef);
		std::sort(input_names.begin(), input_names.end());

		// Try hash types with increasing collision rate, and return if found.
		for (int type = 0; type <= craft_hash_type_max; type++) {
			u64 hash = getHashForGrid((CraftHashType) type, input_names);

			/*errorstream << "Checking type " << type << " with hash " << hash << std::endl;*/

			// We'd like to do "const [...] hash_collisions = m_craft_defs[type][hash];"
			// but that doesn't compile for some reason. This does.
			auto col_iter = (m_craft_defs[type]).find(hash);

			if (col_iter == (m_craft_defs[type]).end())
				continue;

			const std::vector<CraftDefinition*> &hash_collisions = col_iter->second;
			// Walk crafting definitions from back to front, so that later
			// definitions can override earlier ones.
			for (std::vector<CraftDefinition*>::size_type
					i = hash_collisions.size(); i > 0; i--) {
				CraftDefinition *def = hash_collisions[i - 1];

				/*errorstream << "Checking " << input.dump() << std::endl
					<< " against " << def->dump() << std::endl;*/

				if (def->check(input, gamedef)) {
					// Check if the crafted node/item exists
					CraftOutput out = def->getOutput(input, gamedef);
					ItemStack is;
					is.deSerialize(out.item, gamedef->idef());
					if (!is.isKnown(gamedef->idef())) {
						infostream << "trying to craft non-existent "
							<< out.item << ", ignoring recipe" << std::endl;
						continue;
					}

					// Get output, then decrement input (if requested)
					output = out;
                    
					if (decrementInput)
						def->decrementInput(input, output_replacement, gamedef);
					/*errorstream << "Check RETURNS TRUE" << std::endl;*/
					return true;
				}
			}
		}
		return false;
	}