minecraft-src/net/minecraft/server/commands/FillBiomeCommand.java

package net.minecraft.server.commands;

import com.mojang.brigadier.CommandDispatcher;
import com.mojang.brigadier.exceptions.CommandSyntaxException;
import com.mojang.brigadier.exceptions.Dynamic2CommandExceptionType;
import com.mojang.brigadier.exceptions.SimpleCommandExceptionType;
import com.mojang.datafixers.util.Either;
import java.util.ArrayList;
import java.util.List;
import java.util.Optional;
import java.util.function.Consumer;
import java.util.function.Predicate;
import java.util.function.Supplier;
import net.minecraft.commands.CommandBuildContext;
import net.minecraft.commands.CommandSourceStack;
import net.minecraft.commands.Commands;
import net.minecraft.commands.arguments.ResourceArgument;
import net.minecraft.commands.arguments.ResourceOrTagArgument;
import net.minecraft.commands.arguments.coordinates.BlockPosArgument;
import net.minecraft.core.BlockPos;
import net.minecraft.core.Holder;
import net.minecraft.core.QuartPos;
import net.minecraft.core.SectionPos;
import net.minecraft.core.registries.Registries;
import net.minecraft.network.chat.Component;
import net.minecraft.server.level.ServerLevel;
import net.minecraft.world.level.GameRules;
import net.minecraft.world.level.biome.Biome;
import net.minecraft.world.level.biome.BiomeResolver;
import net.minecraft.world.level.chunk.ChunkAccess;
import net.minecraft.world.level.chunk.status.ChunkStatus;
import net.minecraft.world.level.levelgen.structure.BoundingBox;
import org.apache.commons.lang3.mutable.MutableInt;

public class FillBiomeCommand {
	public static final SimpleCommandExceptionType ERROR_NOT_LOADED = new SimpleCommandExceptionType(Component.translatable("argument.pos.unloaded"));
	private static final Dynamic2CommandExceptionType ERROR_VOLUME_TOO_LARGE = new Dynamic2CommandExceptionType(
		(object, object2) -> Component.translatableEscape("commands.fillbiome.toobig", object, object2)
	);

	public static void register(CommandDispatcher<CommandSourceStack> dispatcher, CommandBuildContext context) {
		dispatcher.register(
			Commands.literal("fillbiome")
				.requires(Commands.hasPermission(2))
				.then(
					Commands.argument("from", BlockPosArgument.blockPos())
						.then(
							Commands.argument("to", BlockPosArgument.blockPos())
								.then(
									Commands.argument("biome", ResourceArgument.resource(context, Registries.BIOME))
										.executes(
											commandContext -> fill(
												commandContext.getSource(),
												BlockPosArgument.getLoadedBlockPos(commandContext, "from"),
												BlockPosArgument.getLoadedBlockPos(commandContext, "to"),
												ResourceArgument.getResource(commandContext, "biome", Registries.BIOME),
												holder -> true
											)
										)
										.then(
											Commands.literal("replace")
												.then(
													Commands.argument("filter", ResourceOrTagArgument.resourceOrTag(context, Registries.BIOME))
														.executes(
															commandContext -> fill(
																commandContext.getSource(),
																BlockPosArgument.getLoadedBlockPos(commandContext, "from"),
																BlockPosArgument.getLoadedBlockPos(commandContext, "to"),
																ResourceArgument.getResource(commandContext, "biome", Registries.BIOME),
																ResourceOrTagArgument.getResourceOrTag(commandContext, "filter", Registries.BIOME)::test
															)
														)
												)
										)
								)
						)
				)
		);
	}

	private static int quantize(int value) {
		return QuartPos.toBlock(QuartPos.fromBlock(value));
	}

	private static BlockPos quantize(BlockPos pos) {
		return new BlockPos(quantize(pos.getX()), quantize(pos.getY()), quantize(pos.getZ()));
	}

	private static BiomeResolver makeResolver(
		MutableInt biomeEntries, ChunkAccess chunk, BoundingBox targetRegion, Holder<Biome> replacementBiome, Predicate<Holder<Biome>> filter
	) {
		return (i, j, k, sampler) -> {
			int l = QuartPos.toBlock(i);
			int m = QuartPos.toBlock(j);
			int n = QuartPos.toBlock(k);
			Holder<Biome> holder2 = chunk.getNoiseBiome(i, j, k);
			if (targetRegion.isInside(l, m, n) && filter.test(holder2)) {
				biomeEntries.increment();
				return replacementBiome;
			} else {
				return holder2;
			}
		};
	}

	public static Either<Integer, CommandSyntaxException> fill(ServerLevel level, BlockPos from, BlockPos to, Holder<Biome> biome) {
		return fill(level, from, to, biome, holder -> true, supplier -> {});
	}

	public static Either<Integer, CommandSyntaxException> fill(
		ServerLevel level, BlockPos from, BlockPos to, Holder<Biome> biome, Predicate<Holder<Biome>> filter, Consumer<Supplier<Component>> messageOutput
	) {
		BlockPos blockPos = quantize(from);
		BlockPos blockPos2 = quantize(to);
		BoundingBox boundingBox = BoundingBox.fromCorners(blockPos, blockPos2);
		int i = boundingBox.getXSpan() * boundingBox.getYSpan() * boundingBox.getZSpan();
		int j = level.getGameRules().getInt(GameRules.RULE_COMMAND_MODIFICATION_BLOCK_LIMIT);
		if (i > j) {
			return Either.right(ERROR_VOLUME_TOO_LARGE.create(j, i));
		} else {
			List<ChunkAccess> list = new ArrayList();

			for (int k = SectionPos.blockToSectionCoord(boundingBox.minZ()); k <= SectionPos.blockToSectionCoord(boundingBox.maxZ()); k++) {
				for (int l = SectionPos.blockToSectionCoord(boundingBox.minX()); l <= SectionPos.blockToSectionCoord(boundingBox.maxX()); l++) {
					ChunkAccess chunkAccess = level.getChunk(l, k, ChunkStatus.FULL, false);
					if (chunkAccess == null) {
						return Either.right(ERROR_NOT_LOADED.create());
					}

					list.add(chunkAccess);
				}
			}

			MutableInt mutableInt = new MutableInt(0);

			for (ChunkAccess chunkAccess : list) {
				chunkAccess.fillBiomesFromNoise(makeResolver(mutableInt, chunkAccess, boundingBox, biome, filter), level.getChunkSource().randomState().sampler());
				chunkAccess.markUnsaved();
			}

			level.getChunkSource().chunkMap.resendBiomesForChunks(list);
			messageOutput.accept(
				(Supplier)() -> Component.translatable(
					"commands.fillbiome.success.count",
					mutableInt.getValue(),
					boundingBox.minX(),
					boundingBox.minY(),
					boundingBox.minZ(),
					boundingBox.maxX(),
					boundingBox.maxY(),
					boundingBox.maxZ()
				)
			);
			return Either.left(mutableInt.getValue());
		}
	}

	private static int fill(CommandSourceStack source, BlockPos from, BlockPos to, Holder.Reference<Biome> biome, Predicate<Holder<Biome>> filter) throws CommandSyntaxException {
		Either<Integer, CommandSyntaxException> either = fill(source.getLevel(), from, to, biome, filter, supplier -> source.sendSuccess(supplier, true));
		Optional<CommandSyntaxException> optional = either.right();
		if (optional.isPresent()) {
			throw (CommandSyntaxException)optional.get();
		} else {
			return (Integer)either.left().get();
		}
	}
}