From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Fri, 26 Apr 2024 23:15:27 -0700
Subject: [PATCH] Add experimental improved give command

Supports removing data components from itemstacks

diff --git a/src/main/java/net/minecraft/commands/arguments/item/ItemArgument.java b/src/main/java/net/minecraft/commands/arguments/item/ItemArgument.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/commands/arguments/item/ItemArgument.java
+++ b/src/main/java/net/minecraft/commands/arguments/item/ItemArgument.java
@@ -0,0 +0,0 @@ public class ItemArgument implements ArgumentType<ItemInput> {
     private final ItemParser parser;
 
     public ItemArgument(CommandBuildContext commandRegistryAccess) {
-        this.parser = new ItemParser(commandRegistryAccess);
+        // Paper start - support component removals
+        this(commandRegistryAccess, false);
+    }
+    public ItemArgument(CommandBuildContext commandRegistryAccess, boolean allowRemovals) {
+        this.parser = new ItemParser(commandRegistryAccess, allowRemovals);
+        // Paper end - support component removals
     }
 
     public static ItemArgument item(CommandBuildContext commandRegistryAccess) {
@@ -0,0 +0,0 @@ public class ItemArgument implements ArgumentType<ItemInput> {
 
     public ItemInput parse(StringReader stringReader) throws CommandSyntaxException {
         ItemParser.ItemResult itemResult = this.parser.parse(stringReader);
-        return new ItemInput(itemResult.item(), itemResult.components());
+        return new ItemInput(itemResult.item(), itemResult.components(), itemResult.patch()); // Paper - support component removals
     }
 
     public static <S> ItemInput getItem(CommandContext<S> context, String name) {
diff --git a/src/main/java/net/minecraft/commands/arguments/item/ItemInput.java b/src/main/java/net/minecraft/commands/arguments/item/ItemInput.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/commands/arguments/item/ItemInput.java
+++ b/src/main/java/net/minecraft/commands/arguments/item/ItemInput.java
@@ -0,0 +0,0 @@ public class ItemInput {
     );
     private final Holder<Item> item;
     private final DataComponentMap components;
+    @javax.annotation.Nullable private final net.minecraft.core.component.DataComponentPatch patch; // Paper
 
     public ItemInput(Holder<Item> item, DataComponentMap components) {
+        // Paper start
+        this(item, components, null);
+    }
+    public ItemInput(Holder<Item> item, DataComponentMap components, @javax.annotation.Nullable final net.minecraft.core.component.DataComponentPatch patch) {
+        this.patch = patch;
+        // Paper end
         this.item = item;
         this.components = components;
     }
@@ -0,0 +0,0 @@ public class ItemInput {
 
     public ItemStack createItemStack(int amount, boolean checkOverstack) throws CommandSyntaxException {
         ItemStack itemStack = new ItemStack(this.item, amount);
-        itemStack.applyComponents(this.components);
+        // Paper start - support component removals
+        if (this.patch != null) {
+            itemStack.applyComponents(this.patch);
+        } else {
+            itemStack.applyComponents(this.components);
+        }
+        // Paper end - support component removals
         if (checkOverstack && amount > itemStack.getMaxStackSize()) {
             throw ERROR_STACK_TOO_BIG.create(this.getItemName(), itemStack.getMaxStackSize());
         } else {
diff --git a/src/main/java/net/minecraft/commands/arguments/item/ItemParser.java b/src/main/java/net/minecraft/commands/arguments/item/ItemParser.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/commands/arguments/item/ItemParser.java
+++ b/src/main/java/net/minecraft/commands/arguments/item/ItemParser.java
@@ -0,0 +0,0 @@ public class ItemParser {
     static final Function<SuggestionsBuilder, CompletableFuture<Suggestions>> SUGGEST_NOTHING = SuggestionsBuilder::buildFuture;
     final HolderLookup.RegistryLookup<Item> items;
     final DynamicOps<Tag> registryOps;
+    final boolean allowRemoves; // Paper - support component removals
 
     public ItemParser(HolderLookup.Provider registriesLookup) {
+        // Paper start - support component removals
+        this(registriesLookup, false);
+    }
+    public ItemParser(HolderLookup.Provider registriesLookup, boolean allowRemoves) {
+        this.allowRemoves = allowRemoves;
+        // Paper end - support component removals
         this.items = registriesLookup.lookupOrThrow(Registries.ITEM);
         this.registryOps = registriesLookup.createSerializationContext(NbtOps.INSTANCE);
     }
@@ -0,0 +0,0 @@ public class ItemParser {
     public ItemParser.ItemResult parse(StringReader reader) throws CommandSyntaxException {
         final MutableObject<Holder<Item>> mutableObject = new MutableObject<>();
         final DataComponentMap.Builder builder = DataComponentMap.builder();
+        final net.minecraft.core.component.DataComponentPatch.Builder patchBuilder = net.minecraft.core.component.DataComponentPatch.builder(); // Paper - support component removals
         this.parse(reader, new ItemParser.Visitor() {
             @Override
             public void visitItem(Holder<Item> item) {
@@ -0,0 +0,0 @@ public class ItemParser {
             @Override
             public <T> void visitComponent(DataComponentType<T> type, T value) {
                 builder.set(type, value);
+                // Paper start - support component removals
+                patchBuilder.set(type, value);
+            }
+            @Override
+            public <T> void visitComponentRemove(final DataComponentType<T> type) {
+                patchBuilder.remove(type);
+                // Paper end - support component removals
             }
         });
         Holder<Item> holder = Objects.requireNonNull(mutableObject.getValue(), "Parser gave no item");
         DataComponentMap dataComponentMap = builder.build();
         validateComponents(reader, holder, dataComponentMap);
-        return new ItemParser.ItemResult(holder, dataComponentMap);
+        return new ItemParser.ItemResult(holder, dataComponentMap, this.allowRemoves ? patchBuilder.build() : null); // Paper - support component removals
     }
 
     private static void validateComponents(StringReader reader, Holder<Item> item, DataComponentMap components) throws CommandSyntaxException {
@@ -0,0 +0,0 @@ public class ItemParser {
         return suggestionsVisitor.resolveSuggestions(builder, stringReader);
     }
 
-    public static record ItemResult(Holder<Item> item, DataComponentMap components) {
+    public static record ItemResult(Holder<Item> item, DataComponentMap components, @javax.annotation.Nullable net.minecraft.core.component.DataComponentPatch patch) { // Paper
     }
 
     class State {
@@ -0,0 +0,0 @@ public class ItemParser {
 
             while (this.reader.canRead() && this.reader.peek() != ']') {
                 this.reader.skipWhitespace();
+                boolean removing = ItemParser.this.allowRemoves && this.reader.canRead() && this.reader.peek() == '!';
+                if (removing) {
+                    this.reader.skip();
+                    this.visitor.visitSuggestions(builder -> this.suggestComponentAssignment(builder, false));
+                }
                 DataComponentType<?> dataComponentType = readComponentType(this.reader);
                 if (!set.add(dataComponentType)) {
                     throw ItemParser.ERROR_REPEATED_COMPONENT.create(dataComponentType);
                 }
 
+                // Paper start - support component removals
+                if (removing) {
+                    this.visitor.visitComponentRemove(dataComponentType);
+                } else {
+                // Paper end - support component removals
                 this.visitor.visitSuggestions(this::suggestAssignment);
                 this.reader.skipWhitespace();
                 this.reader.expect('=');
                 this.visitor.visitSuggestions(ItemParser.SUGGEST_NOTHING);
                 this.reader.skipWhitespace();
                 this.readComponent(dataComponentType);
+                } // Paper - support component removals
                 this.reader.skipWhitespace();
                 this.visitor.visitSuggestions(this::suggestNextOrEndComponents);
                 if (!this.reader.canRead() || this.reader.peek() != ',') {
@@ -0,0 +0,0 @@ public class ItemParser {
         }
 
         private CompletableFuture<Suggestions> suggestComponentAssignment(SuggestionsBuilder builder) {
+            // Paper start - support component removals
+            return this.suggestComponentAssignment(builder, true);
+        }
+        private CompletableFuture<Suggestions> suggestComponentAssignment(SuggestionsBuilder builder, boolean suggestRemove) {
             String string = builder.getRemaining().toLowerCase(Locale.ROOT);
+            if (suggestRemove && string.isBlank()) builder.suggest("!", Component.literal("Remove a data component"));
+            // Paper end - support component removals
             SharedSuggestionProvider.filterResources(BuiltInRegistries.DATA_COMPONENT_TYPE.entrySet(), string, entry -> entry.getKey().location(), entry -> {
                 DataComponentType<?> dataComponentType = entry.getValue();
                 if (dataComponentType.codec() != null) {
                     ResourceLocation resourceLocation = entry.getKey().location();
-                    builder.suggest(resourceLocation.toString() + "=");
+                    builder.suggest(resourceLocation.toString() + (suggestRemove ? "=" : "")); // Paper - support component removals
                 }
             });
             return builder.buildFuture();
@@ -0,0 +0,0 @@ public class ItemParser {
 
         default <T> void visitComponent(DataComponentType<T> type, T value) {
         }
+        default <T> void visitComponentRemove(DataComponentType<T> type) {} // Paper
 
         default void visitSuggestions(Function<SuggestionsBuilder, CompletableFuture<Suggestions>> suggestor) {
         }
diff --git a/src/main/java/net/minecraft/server/commands/GiveCommand.java b/src/main/java/net/minecraft/server/commands/GiveCommand.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/server/commands/GiveCommand.java
+++ b/src/main/java/net/minecraft/server/commands/GiveCommand.java
@@ -0,0 +0,0 @@ public class GiveCommand {
         })).then(net.minecraft.commands.Commands.argument("count", IntegerArgumentType.integer(1)).executes((commandcontext) -> {
             return GiveCommand.giveItem((CommandSourceStack) commandcontext.getSource(), ItemArgument.getItem(commandcontext, "item"), EntityArgument.getPlayers(commandcontext, "targets"), IntegerArgumentType.getInteger(commandcontext, "count"));
         })))));
+        // Paper start - support component removals with a custom pgive command
+        final com.mojang.brigadier.tree.CommandNode<net.minecraft.commands.CommandSourceStack> node = net.minecraft.commands.Commands
+            .literal("pgive").requires((css) ->  css.hasPermission(2))
+            .then(net.minecraft.commands.Commands.argument("targets", EntityArgument.players())
+                .then(net.minecraft.commands.Commands.argument("item", new ItemArgument(commandRegistryAccess, true)).executes((ctx) -> {
+                    return GiveCommand.giveItem(ctx.getSource(), ItemArgument.getItem(ctx, "item"), EntityArgument.getPlayers(ctx, "targets"), 1);
+                })
+                    .then(net.minecraft.commands.Commands.argument("count", IntegerArgumentType.integer(1)).executes((ctx) -> {
+                        return GiveCommand.giveItem(ctx.getSource(), ItemArgument.getItem(ctx, "item"), EntityArgument.getPlayers(ctx, "targets"), IntegerArgumentType.getInteger(ctx, "count"));
+                    }))
+                )
+            ).build();
+        setClientNodes(node);
+        dispatcher.getRoot().addChild(node);
+    }
+    static void setClientNodes(com.mojang.brigadier.tree.CommandNode<net.minecraft.commands.CommandSourceStack> node) {
+        if (node instanceof com.mojang.brigadier.tree.ArgumentCommandNode<net.minecraft.commands.CommandSourceStack,?> argumentNode) {
+            if (argumentNode.getType() instanceof ItemArgument) {
+                node.clientNode = new com.mojang.brigadier.tree.ArgumentCommandNode<>(
+                    argumentNode.getName(),
+                    com.mojang.brigadier.arguments.StringArgumentType.greedyString(),
+                    argumentNode.getCommand(),
+                    argumentNode.getRequirement(),
+                    argumentNode.getRedirect(),
+                    argumentNode.getRedirectModifier(),
+                    argumentNode.isFork(),
+                    (ctx, builder) -> builder.buildFuture()
+                );
+            }
+        }
+        node.getChildren().forEach(GiveCommand::setClientNodes);
+        // Paper end - support component removals with a custom pgive command
     }
 
     private static int giveItem(CommandSourceStack source, ItemInput item, Collection<ServerPlayer> targets, int count) throws CommandSyntaxException {
diff --git a/src/main/java/org/bukkit/craftbukkit/command/VanillaCommandWrapper.java b/src/main/java/org/bukkit/craftbukkit/command/VanillaCommandWrapper.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/org/bukkit/craftbukkit/command/VanillaCommandWrapper.java
+++ b/src/main/java/org/bukkit/craftbukkit/command/VanillaCommandWrapper.java
@@ -0,0 +0,0 @@ public final class VanillaCommandWrapper extends BukkitCommand {
             vanillaCommand = vanillaCommand.getRedirect();
         }
         final String commandName = vanillaCommand.getName();
+        if ("pgive".equals(stripDefaultNamespace(commandName))) {
+            return "bukkit.command.paper.pgive";
+        }
         return "minecraft.command." + stripDefaultNamespace(commandName);
     }
 
diff --git a/src/test/java/io/papermc/paper/permissions/MinecraftCommandPermissionsTest.java b/src/test/java/io/papermc/paper/permissions/MinecraftCommandPermissionsTest.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/test/java/io/papermc/paper/permissions/MinecraftCommandPermissionsTest.java
+++ b/src/test/java/io/papermc/paper/permissions/MinecraftCommandPermissionsTest.java
@@ -0,0 +0,0 @@ public class MinecraftCommandPermissionsTest extends AbstractTestingBase {
         Set<String> foundPerms = new HashSet<>();
         for (CommandNode<CommandSourceStack> child : root.getChildren()) {
             final String vanillaPerm = VanillaCommandWrapper.getPermission(child);
+            if ("bukkit.command.paper.pgive".equals(vanillaPerm)) { // skip our custom give command
+                continue;
+            }
             if (!perms.contains(vanillaPerm)) {
                 missing.add("Missing permission for " + child.getName() + " (" + vanillaPerm + ") command");
             } else {
