C++ ItemStack::deSerialize方法代码示例

bool PlayerDatabaseSQLite3::loadPlayer(RemotePlayer *player, PlayerSAO *sao)
{
	verifyDatabase();

	str_to_sqlite(m_stmt_player_load, 1, player->getName());
	if (sqlite3_step(m_stmt_player_load) != SQLITE_ROW) {
		sqlite3_reset(m_stmt_player_load);
		return false;
	}
	sao->setPitch(sqlite_to_float(m_stmt_player_load, 0));
	sao->setYaw(sqlite_to_float(m_stmt_player_load, 1));
	sao->setBasePosition(sqlite_to_v3f(m_stmt_player_load, 2));
	sao->setHPRaw((s16) MYMIN(sqlite_to_int(m_stmt_player_load, 5), S16_MAX));
	sao->setBreath((u16) MYMIN(sqlite_to_int(m_stmt_player_load, 6), U16_MAX), false);
	sqlite3_reset(m_stmt_player_load);

	// Load inventory
	str_to_sqlite(m_stmt_player_load_inventory, 1, player->getName());
	while (sqlite3_step(m_stmt_player_load_inventory) == SQLITE_ROW) {
		InventoryList *invList = player->inventory.addList(
			sqlite_to_string(m_stmt_player_load_inventory, 2),
			sqlite_to_uint(m_stmt_player_load_inventory, 3));
		invList->setWidth(sqlite_to_uint(m_stmt_player_load_inventory, 1));

		u32 invId = sqlite_to_uint(m_stmt_player_load_inventory, 0);

		str_to_sqlite(m_stmt_player_load_inventory_items, 1, player->getName());
		int_to_sqlite(m_stmt_player_load_inventory_items, 2, invId);
		while (sqlite3_step(m_stmt_player_load_inventory_items) == SQLITE_ROW) {
			const std::string itemStr = sqlite_to_string(m_stmt_player_load_inventory_items, 1);
			if (itemStr.length() > 0) {
				ItemStack stack;
				stack.deSerialize(itemStr);
				invList->addItem(sqlite_to_uint(m_stmt_player_load_inventory_items, 0), stack);
			}
		}
		sqlite3_reset(m_stmt_player_load_inventory_items);
	}

	sqlite3_reset(m_stmt_player_load_inventory);

	str_to_sqlite(m_stmt_player_metadata_load, 1, sao->getPlayer()->getName());
	while (sqlite3_step(m_stmt_player_metadata_load) == SQLITE_ROW) {
		std::string attr = sqlite_to_string(m_stmt_player_metadata_load, 0);
		std::string value = sqlite_to_string(m_stmt_player_metadata_load, 1);

		sao->setExtendedAttribute(attr, value);
	}
	sqlite3_reset(m_stmt_player_metadata_load);
	return true;
}

// 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;
}

ItemStack read_item(lua_State *L, int index)
{
	if(index < 0)
		index = lua_gettop(L) + 1 + index;

	if(lua_isnil(L, index))
	{
		return ItemStack();
	}
	else if(lua_isuserdata(L, index))
	{
		// Convert from LuaItemStack
		LuaItemStack *o = LuaItemStack::checkobject(L, index);
		return o->getItem();
	}
	else if(lua_isstring(L, index))
	{
		// Convert from itemstring
		std::string itemstring = lua_tostring(L, index);
		IItemDefManager *idef = get_server(L)->idef();
		try
		{
			ItemStack item;
			item.deSerialize(itemstring, idef);
			return item;
		}
		catch(SerializationError &e)
		{
			infostream<<"WARNING: unable to create item from itemstring"
					<<": "<<itemstring<<std::endl;
			return ItemStack();
		}
	}
	else if(lua_istable(L, index))
	{
		// Convert from table
		IItemDefManager *idef = get_server(L)->idef();
		std::string name = getstringfield_default(L, index, "name", "");
		int count = getintfield_default(L, index, "count", 1);
		int wear = getintfield_default(L, index, "wear", 0);
		std::string metadata = getstringfield_default(L, index, "metadata", "");
		return ItemStack(name, count, wear, metadata, idef);
	}
	else
	{
		throw LuaError(L, "Expecting itemstack, itemstring, table or nil");
	}
}

	ItemStack createItemStack()
	{
		try{
			IItemDefManager *idef = m_env->getGameDef()->idef();
			ItemStack item;
			item.deSerialize(m_itemstring, idef);
			infostream<<__FUNCTION_NAME<<": m_itemstring=\""<<m_itemstring
					<<"\" -> item=\""<<item.getItemString()<<"\""
					<<std::endl;
			return item;
		}
		catch(SerializationError &e)
		{
			infostream<<__FUNCTION_NAME<<": serialization error: "
					<<"m_itemstring=\""<<m_itemstring<<"\""<<std::endl;
			return ItemStack();
		}
	}

// Removes 1 from each item stack with replacement support
// Example: if replacements contains the pair ("bucket:bucket_water", "bucket:bucket_empty"),
//   a water bucket will not be removed but replaced by an empty bucket.
static void craftDecrementOrReplaceInput(CraftInput &input,
		std::vector<ItemStack> &output_replacements,
		const CraftReplacements &replacements,
		IGameDef *gamedef)
{
	if (replacements.pairs.empty()) {
		craftDecrementInput(input, gamedef);
		return;
	}

	// Make a copy of the replacements pair list
	std::vector<std::pair<std::string, std::string> > pairs = replacements.pairs;

	for (auto &item : input.items) {
		// Find an appropriate replacement
		bool found_replacement = false;
		for (auto j = pairs.begin(); j != pairs.end(); ++j) {
			if (inputItemMatchesRecipe(item.name, j->first, gamedef->idef())) {
				if (item.count == 1) {
					item.deSerialize(j->second, gamedef->idef());
					found_replacement = true;
					pairs.erase(j);
					break;
				}

				ItemStack rep;
				rep.deSerialize(j->second, gamedef->idef());
				item.remove(1);
				found_replacement = true;
				output_replacements.push_back(rep);
				break;

			}
		}
		// No replacement was found, simply decrement count by one
		if (!found_replacement && item.count > 0)
			item.remove(1);
	}
}

// Crafting helper
bool getCraftingResult(Inventory *inv, ItemStack& result,
		std::vector<ItemStack> &output_replacements,
		bool decrementInput, IGameDef *gamedef)
{
	DSTACK(__FUNCTION_NAME);
	
	result.clear();

	// Get the InventoryList in which we will operate
	InventoryList *clist = inv->getList("craft");
	if(!clist)
		return false;

	// Mangle crafting grid to an another format
	CraftInput ci;
	ci.method = CRAFT_METHOD_NORMAL;
	ci.width = clist->getWidth() ? clist->getWidth() : 3;
	for(u16 i=0; i<clist->getSize(); i++)
		ci.items.push_back(clist->getItem(i));

	// Find out what is crafted and add it to result item slot
	CraftOutput co;
	bool found = gamedef->getCraftDefManager()->getCraftResult(
			ci, co, output_replacements, decrementInput, gamedef);
	if(found)
		result.deSerialize(co.item, gamedef->getItemDefManager());

	if(found && decrementInput)
	{
		// CraftInput has been changed, apply changes in clist
		for(u16 i=0; i<clist->getSize(); i++)
		{
			clist->changeItem(i, ci.items[i]);
		}
	}

	return found;
}

// Deserialize an itemstring then return the name of the item
static std::string craftGetItemName(const std::string &itemstring, IGameDef *gamedef)
{
	ItemStack item;
	item.deSerialize(itemstring, gamedef->idef());
	return item.name;
}

	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;
	}

ItemStack read_item(lua_State* L, int index,Server* srv)
{
	if(index < 0)
		index = lua_gettop(L) + 1 + index;

	if(lua_isnil(L, index))
	{
		return ItemStack();
	}
	else if(lua_isuserdata(L, index))
	{
		// Convert from LuaItemStack
		LuaItemStack *o = LuaItemStack::checkobject(L, index);
		return o->getItem();
	}
	else if(lua_isstring(L, index))
	{
		// Convert from itemstring
		std::string itemstring = lua_tostring(L, index);
		IItemDefManager *idef = srv->idef();
		try
		{
			ItemStack item;
			item.deSerialize(itemstring, idef);
			return item;
		}
		catch(SerializationError &e)
		{
			warningstream<<"unable to create item from itemstring"
					<<": "<<itemstring<<std::endl;
			return ItemStack();
		}
	}
	else if(lua_istable(L, index))
	{
		// Convert from table
		IItemDefManager *idef = srv->idef();
		std::string name = getstringfield_default(L, index, "name", "");
		int count = getintfield_default(L, index, "count", 1);
		int wear = getintfield_default(L, index, "wear", 0);

		ItemStack istack(name, count, wear, idef);

		lua_getfield(L, index, "metadata");

		// Support old metadata format by checking type
		int fieldstable = lua_gettop(L);
		if (lua_istable(L, fieldstable)) {
			lua_pushnil(L);
			while (lua_next(L, fieldstable) != 0) {
				// key at index -2 and value at index -1
				std::string key = lua_tostring(L, -2);
				size_t value_len;
				const char *value_cs = lua_tolstring(L, -1, &value_len);
				std::string value(value_cs, value_len);
				istack.metadata.setString(name, value);
				lua_pop(L, 1); // removes value, keeps key for next iteration
			}
		} else {
			// BACKWARDS COMPATIBLITY
			std::string value = getstringfield_default(L, index, "metadata", "");
			istack.metadata.setString("", value);
		}

		lua_getfield(L, index, "meta");
		fieldstable = lua_gettop(L);
		if (lua_istable(L, fieldstable)) {
			lua_pushnil(L);
			while (lua_next(L, fieldstable) != 0) {
				// key at index -2 and value at index -1
				std::string key = lua_tostring(L, -2);
				size_t value_len;
				const char *value_cs = lua_tolstring(L, -1, &value_len);
				std::string value(value_cs, value_len);
				istack.metadata.setString(name, value);
				lua_pop(L, 1); // removes value, keeps key for next iteration
			}
		}

		return istack;
	} else {
		throw LuaError("Expecting itemstack, itemstring, table or nil");
	}
}

bool RollbackAction::applyRevert(Map *map, InventoryManager *imgr, IGameDef *gamedef) const
{
	try{
		switch(type){
		case TYPE_NOTHING:
			return true;
		case TYPE_SET_NODE: {
			INodeDefManager *ndef = gamedef->ndef();
			// Make sure position is loaded from disk
			map->emergeBlock(getContainerPos(p, MAP_BLOCKSIZE), false);
			// Check current node
			MapNode current_node = map->getNodeNoEx(p);
			std::string current_name = ndef->get(current_node).name;
			// If current node not the new node, it's bad
			if(current_name != n_new.name)
				return false;
			/*// If current node not the new node and not ignore, it's bad
			if(current_name != n_new.name && current_name != "ignore")
				return false;*/
			// Create rollback node
			MapNode n(ndef, n_old.name, n_old.param1, n_old.param2);
			// Set rollback node
			try{
				if(!map->addNodeWithEvent(p, n)){
					infostream<<"RollbackAction::applyRevert(): "
							<<"AddNodeWithEvent failed at "
							<<PP(p)<<" for "<<n_old.name<<std::endl;
					return false;
				}
				NodeMetadata *meta = map->getNodeMetadata(p);
				if(n_old.meta != ""){
					if(!meta){
						meta = new NodeMetadata(gamedef);
						if(!map->setNodeMetadata(p, meta)){
							delete meta;
							infostream<<"RollbackAction::applyRevert(): "
									<<"setNodeMetadata failed at "
									<<PP(p)<<" for "<<n_old.name<<std::endl;
							return false;
						}
					}
					std::istringstream is(n_old.meta, std::ios::binary);
					meta->deSerialize(is);
				} else {
					map->removeNodeMetadata(p);
				}
				// NOTE: This same code is in scriptapi.cpp
				// Inform other things that the metadata has changed
				v3s16 blockpos = getContainerPos(p, MAP_BLOCKSIZE);
				MapEditEvent event;
				event.type = MEET_BLOCK_NODE_METADATA_CHANGED;
				event.p = blockpos;
				map->dispatchEvent(&event);
				// Set the block to be saved
				MapBlock *block = map->getBlockNoCreateNoEx(blockpos);
				if(block)
					block->raiseModified(MOD_STATE_WRITE_NEEDED,
							"NodeMetaRef::reportMetadataChange");
			}catch(InvalidPositionException &e){
				infostream<<"RollbackAction::applyRevert(): "
						<<"InvalidPositionException: "<<e.what()<<std::endl;
				return false;
			}
			// Success
			return true; }
		case TYPE_MODIFY_INVENTORY_STACK: {
			InventoryLocation loc;
			loc.deSerialize(inventory_location);
			ItemStack stack;
			stack.deSerialize(inventory_stack, gamedef->idef());
			Inventory *inv = imgr->getInventory(loc);
			if(!inv){
				infostream<<"RollbackAction::applyRevert(): Could not get "
						"inventory at "<<inventory_location<<std::endl;
				return false;
			}
			InventoryList *list = inv->getList(inventory_list);
			if(!list){
				infostream<<"RollbackAction::applyRevert(): Could not get "
						"inventory list \""<<inventory_list<<"\" in "
						<<inventory_location<<std::endl;
				return false;
			}
			if(list->getSize() <= inventory_index){
				infostream<<"RollbackAction::applyRevert(): List index "
						<<inventory_index<<" too large in "
						<<"inventory list \""<<inventory_list<<"\" in "
						<<inventory_location<<std::endl;
			}
			// If item was added, take away item, otherwise add removed item
			if(inventory_add){
				// Silently ignore different current item
				if(list->getItem(inventory_index).name != stack.name)
					return false;
				list->takeItem(inventory_index, stack.count);
			} else {
				list->addItem(inventory_index, stack);
			}
			// Inventory was modified; send to clients
			imgr->setInventoryModified(loc);
//.........这里部分代码省略.........

void FallingSAO::step(float dtime, bool send_recommended)
{
	// Object pending removal, skip
	if (m_removed || !m_env) {
		return;
	}

	// If no texture, remove it
	if (m_prop.textures.empty()) {
		m_removed = true;
		return;
	}

	LuaEntitySAO::step(dtime, send_recommended);

	INodeDefManager* ndef = m_env->getGameDef()->getNodeDefManager();

	m_acceleration = v3f(0,-10*BS,0);
	// Under node, center
	v3f p_under(m_base_position.X, m_base_position.Y - 7, m_base_position.Z);
	v3s16 p = floatToInt(m_base_position, BS);
/*
	bool cur_exists = false, under_exists = false;
*/
	MapNode n = m_env->getMap().getNode(p),
			n_under = m_env->getMap().getNode(floatToInt(p_under, BS));
	const ContentFeatures &f = ndef->get(n), &f_under = ndef->get(n_under);

	bool cur_exists = n, under_exists = n_under;

	// Mapblock current or under is not loaded, stop there
	if (!n || !cur_exists || !under_exists) {
		return;
	}

	if ((f_under.walkable || (itemgroup_get(f_under.groups, "float") &&
			f_under.liquid_type == LIQUID_NONE))) {
		if (f_under.leveled && f_under.name.compare(f.name) == 0) {
			u8 addLevel = n.getLevel(ndef);
			if (addLevel == 0) {
				addLevel = n_under.getLevel(ndef);
			}

			if (n_under.addLevel(ndef, addLevel)) {
				m_removed = true;
				return;
			}
		}
		else if (f_under.buildable_to &&
				(itemgroup_get(f.groups,"float") == 0 ||
				 f_under.liquid_type == LIQUID_NONE)) {
			m_env->removeNode(floatToInt(p_under, BS), fast);
			return;
		}

		if (n.getContent() != CONTENT_AIR &&
				(f.liquid_type == LIQUID_NONE)) {
			m_env->removeNode(p);
			if (!f.buildable_to) {
				ItemStack stack;
				std::string n_name = ndef->get(m_node).name;
				stack.deSerialize(n_name);
				m_env->spawnItemActiveObject(n_name, m_base_position, stack);
			}
		}
		m_env->setNode(p, m_node, fast);
		m_removed = true;
		m_env->nodeUpdate(p, 2, fast);
		return;
	}
}

bool PlayerDatabasePostgreSQL::loadPlayer(RemotePlayer *player, PlayerSAO *sao)
{
	sanity_check(sao);
	verifyDatabase();

	const char *values[] = { player->getName() };
	PGresult *results = execPrepared("load_player", 1, values, false, false);

	// Player not found, return not found
	if (!PQntuples(results)) {
		PQclear(results);
		return false;
	}

	sao->setPitch(pg_to_float(results, 0, 0));
	sao->setYaw(pg_to_float(results, 0, 1));
	sao->setBasePosition(v3f(
		pg_to_float(results, 0, 2),
		pg_to_float(results, 0, 3),
		pg_to_float(results, 0, 4))
	);
	sao->setHPRaw((s16) pg_to_int(results, 0, 5));
	sao->setBreath((u16) pg_to_int(results, 0, 6), false);

	PQclear(results);

	// Load inventory
	results = execPrepared("load_player_inventories", 1, values, false, false);

	int resultCount = PQntuples(results);

	for (int row = 0; row < resultCount; ++row) {
		InventoryList* invList = player->inventory.
			addList(PQgetvalue(results, row, 2), pg_to_uint(results, row, 3));
		invList->setWidth(pg_to_uint(results, row, 1));

		u32 invId = pg_to_uint(results, row, 0);
		std::string invIdStr = itos(invId);

		const char* values2[] = {
			player->getName(),
			invIdStr.c_str()
		};
		PGresult *results2 = execPrepared("load_player_inventory_items", 2,
			values2, false, false);

		int resultCount2 = PQntuples(results2);
		for (int row2 = 0; row2 < resultCount2; row2++) {
			const std::string itemStr = PQgetvalue(results2, row2, 1);
			if (itemStr.length() > 0) {
				ItemStack stack;
				stack.deSerialize(itemStr);
				invList->changeItem(pg_to_uint(results2, row2, 0), stack);
			}
		}
		PQclear(results2);
	}

	PQclear(results);

	results = execPrepared("load_player_metadata", 1, values, false);

	int numrows = PQntuples(results);
	for (int row = 0; row < numrows; row++) {
		sao->getMeta().setString(PQgetvalue(results, row, 0), PQgetvalue(results, row, 1));
	}
	sao->getMeta().setModified(false);

	PQclear(results);

	return true;
}