src/game/java/net/minecraft/commands/arguments/DimensionArgument.java

package net.minecraft.commands.arguments;

import com.mojang.brigadier.StringReader;
import com.mojang.brigadier.arguments.ArgumentType;
import com.mojang.brigadier.context.CommandContext;
import com.mojang.brigadier.exceptions.CommandSyntaxException;
import com.mojang.brigadier.exceptions.DynamicCommandExceptionType;
import com.mojang.brigadier.suggestion.Suggestions;
import com.mojang.brigadier.suggestion.SuggestionsBuilder;
import java.util.Collection;
import java.util.concurrent.CompletableFuture;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import net.minecraft.commands.CommandSourceStack;
import net.minecraft.commands.SharedSuggestionProvider;
import net.minecraft.core.registries.Registries;
import net.minecraft.network.chat.Component;
import net.minecraft.resources.ResourceKey;
import net.minecraft.resources.ResourceLocation;
import net.minecraft.server.level.ServerLevel;
import net.minecraft.world.level.Level;

public class DimensionArgument implements ArgumentType<ResourceLocation> {
    private static final Collection<String> EXAMPLES = Stream.of(Level.OVERWORLD, Level.NETHER)
        .map(p_88814_ -> p_88814_.location().toString())
        .collect(Collectors.toList());
    private static final DynamicCommandExceptionType ERROR_INVALID_VALUE = new DynamicCommandExceptionType(
        p_308347_ -> Component.translatableEscape("argument.dimension.invalid", p_308347_)
    );

    public ResourceLocation parse(StringReader p_88807_) throws CommandSyntaxException {
        return ResourceLocation.read(p_88807_);
    }

    @Override
    public <S> CompletableFuture<Suggestions> listSuggestions(CommandContext<S> p_88817_, SuggestionsBuilder p_88818_) {
        return p_88817_.getSource() instanceof SharedSuggestionProvider
            ? SharedSuggestionProvider.suggestResource(((SharedSuggestionProvider)p_88817_.getSource()).levels().stream().map(ResourceKey::location), p_88818_)
            : Suggestions.empty();
    }

    @Override
    public Collection<String> getExamples() {
        return EXAMPLES;
    }

    public static DimensionArgument dimension() {
        return new DimensionArgument();
    }

    public static ServerLevel getDimension(CommandContext<CommandSourceStack> p_88809_, String p_88810_) throws CommandSyntaxException {
        ResourceLocation resourcelocation = p_88809_.getArgument(p_88810_, ResourceLocation.class);
        ResourceKey<Level> resourcekey = ResourceKey.create(Registries.DIMENSION, resourcelocation);
        ServerLevel serverlevel = p_88809_.getSource().getServer().getLevel(resourcekey);
        if (serverlevel == null) {
            throw ERROR_INVALID_VALUE.create(resourcelocation);
        } else {
            return serverlevel;
        }
    }
}