1 files changed, 82 insertions, 0 deletions
diff --git a/src/main/java/de/hysky/skyblocker/utils/datafixer/ItemStackComponentizationFixer.java b/src/main/java/de/hysky/skyblocker/utils/datafixer/ItemStackComponentizationFixer.java
new file mode 100644
index 00000000..3543a2f1
--- /dev/null
+++ b/src/main/java/de/hysky/skyblocker/utils/datafixer/ItemStackComponentizationFixer.java
@@ -0,0 +1,82 @@
+package de.hysky.skyblocker.utils.datafixer;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.Objects;
+import java.util.Optional;
+
+import com.mojang.brigadier.StringReader;
+import com.mojang.serialization.Dynamic;
+
+import net.minecraft.command.argument.ItemStringReader;
+import net.minecraft.command.argument.ItemStringReader.ItemResult;
+import net.minecraft.component.DataComponentType;
+import net.minecraft.datafixer.Schemas;
+import net.minecraft.datafixer.TypeReferences;
+import net.minecraft.item.ItemStack;
+import net.minecraft.nbt.NbtCompound;
+import net.minecraft.nbt.NbtElement;
+import net.minecraft.nbt.NbtOps;
+import net.minecraft.registry.DynamicRegistryManager;
+import net.minecraft.registry.Registries;
+import net.minecraft.registry.RegistryOps;
+import net.minecraft.util.Identifier;
+
+/**
+ * Contains a data fixer to convert legacy item NBT to the new components system, among other fixers related to the item components system.
+ *
+ * @see net.minecraft.datafixer.fix.ItemStackComponentizationFix
+ */
+public class ItemStackComponentizationFixer {
+	private static final int ITEM_NBT_DATA_VERSION = 3817;
+	private static final int ITEM_COMPONENTS_DATA_VERSION = 3825;
+	private static final DynamicRegistryManager REGISTRY_MANAGER = new DynamicRegistryManager.ImmutableImpl(List.of(Registries.ITEM, Registries.DATA_COMPONENT_TYPE));
+
+	public static ItemStack fixUpItem(NbtCompound nbt) {
+		Dynamic<NbtElement> dynamic = Schemas.getFixer().update(TypeReferences.ITEM_STACK, new Dynamic<>(NbtOps.INSTANCE, nbt), ITEM_NBT_DATA_VERSION, ITEM_COMPONENTS_DATA_VERSION);
+
+		return ItemStack.CODEC.parse(dynamic).getOrThrow();
+	}
+
+	/**
+	 * Modified version of {@link net.minecraft.command.argument.ItemStackArgument#asString(net.minecraft.registry.RegistryWrapper.WrapperLookup)} to only care about changed components.
+	 *
+	 * @return The {@link ItemStack}'s components as a string which is in the format that the {@code /give} command accepts.
+	 */
+	public static String componentsAsString(ItemStack stack) {
+		RegistryOps<NbtElement> nbtRegistryOps = REGISTRY_MANAGER.getOps(NbtOps.INSTANCE);
+
+		return Arrays.toString(stack.getComponentChanges().entrySet().stream().map(entry -> {
+			@SuppressWarnings("unchecked")
+			DataComponentType<Object> dataComponentType = (DataComponentType<Object>) entry.getKey();
+			Identifier componentId = Registries.DATA_COMPONENT_TYPE.getId(dataComponentType);
+			Optional<NbtElement> encodedComponent = dataComponentType.getCodec().encodeStart(nbtRegistryOps, entry.getValue().orElseThrow()).result();
+
+			if (componentId == null || encodedComponent.isEmpty()) {
+				return null;
+			}
+
+			return componentId + "=" + encodedComponent.orElseThrow();
+		}).filter(Objects::nonNull).toArray());
+	}
+
+	/**
+	 * Constructs an {@link ItemStack} from an {@code itemId}, with item components in string format as returned by {@link #componentsAsString(ItemStack)}, and with a specified stack count.
+	 *
+	 * @return an {@link ItemStack} or {@link ItemStack#EMPTY} if there was an exception thrown.
+	 */
+	public static ItemStack fromComponentsString(String itemId, int count, String componentsString) {
+		ItemStringReader reader = new ItemStringReader(REGISTRY_MANAGER);
+
+		try {
+			ItemResult result = reader.consume(new StringReader(itemId + componentsString));
+			ItemStack stack = new ItemStack(result.item(), count);
+
+			stack.applyComponentsFrom(result.components());
+
+			return stack;
+		} catch (Exception ignored) {}
+
+		return ItemStack.EMPTY;
+	}
+}