Reduce the size of ItemStackData when json-encoded

Many items need only the name, so we can just place the name directly in this case.
JsonMapper supports hydrating the object directly from the string using the pre-existing constructor for this.

src/crafting/CraftingManagerFromDataHelper.php

@@ -162,7 +162,7 @@ final class CraftingManagerFromDataHelper{
 		}
 
 		$mapper = new \JsonMapper();
-		$mapper->bStrictObjectTypeChecking = true;
+		$mapper->bStrictObjectTypeChecking = false; //to allow hydrating ItemStackData - since this is only used for offline data it's safe
 		$mapper->bExceptionOnUndefinedProperty = true;
 		$mapper->bExceptionOnMissingData = true;
 

src/crafting/json/ItemStackData.php

@@ -23,7 +23,9 @@ declare(strict_types=1);
 
 namespace pocketmine\crafting\json;
 
-final class ItemStackData{
+use function count;
+
+final class ItemStackData implements \JsonSerializable{
 
 	/** @required */
 	public string $name;
@@ -40,4 +42,15 @@ final class ItemStackData{
 	public function __construct(string $name){
 		$this->name = $name;
 	}
+
+	/**
+	 * @return mixed[]|string
+	 */
+	public function jsonSerialize() : array|string{
+		$result = (array) $this;
+		if(count($result) === 1 && isset($result["name"])){
+			return $this->name;
+		}
+		return $result;
+	}
 }

tests/phpstan/configs/phpstan-bugs.neon

@@ -108,6 +108,12 @@ parameters:
 			count: 1
 			path: ../../../src/crafting/ShapedRecipe.php
 
+		-
+			message: '#^Offset ''name'' on \*NEVER\* in isset\(\) always exists and is not nullable\.$#'
+			identifier: isset.offset
+			count: 1
+			path: ../../../src/crafting/json/ItemStackData.php
+
 		-
 			message: '#^Property pocketmine\\crash\\CrashDumpData\:\:\$parameters \(list\<string\>\) does not accept array\.$#'
 			identifier: assign.propertyType

tools/generate-bedrock-data-from-packets.php

@@ -207,11 +207,18 @@ class ParserPacketHandler extends PacketHandler{
 		return $data;
 	}
 
-	/**
-	 * @return mixed[]
-	 */
-	private static function objectToOrderedArray(object $object) : array{
-		$result = (array) ($object instanceof \JsonSerializable ? $object->jsonSerialize() : $object);
+	private static function objectToOrderedArray(object $object) : mixed{
+		if($object instanceof \JsonSerializable){
+			$result = $object->jsonSerialize();
+			if(is_object($result)){
+				$result = (array) $result;
+			}elseif(!is_array($result)){
+				return $result;
+			}
+		}else{
+			$result = (array) $object;
+		}
+
 		ksort($result, SORT_STRING);
 
 		foreach(Utils::promoteKeys($result) as $property => $value){
@@ -278,7 +285,7 @@ class ParserPacketHandler extends PacketHandler{
 		file_put_contents($this->bedrockDataPath . '/required_item_list.json', json_encode($table, JSON_PRETTY_PRINT) . "\n");
 
 		echo "updating item registry\n";
-		$items = array_map(function(ItemTypeEntry $entry) : array{
+		$items = array_map(function(ItemTypeEntry $entry) : mixed{
 			return self::objectToOrderedArray($entry);
 		}, $packet->getEntries());
 		file_put_contents($this->bedrockDataPath . '/item_registry.json', json_encode($items, JSON_PRETTY_PRINT) . "\n");