content: package pers.neige.neigeitems.command.arguments;
  
  import com.mojang.brigadier.StringReader;
  import com.mojang.brigadier.arguments.ArgumentType;
  import com.mojang.brigadier.context.CommandContext;
  import com.mojang.brigadier.suggestion.Suggestions;
  import com.mojang.brigadier.suggestion.SuggestionsBuilder;
  import lombok.NonNull;
  import lombok.val;
  import org.bukkit.Bukkit;
  import org.bukkit.World;
  import org.bukkit.command.CommandSender;
  import org.jetbrains.annotations.Nullable;
  import pers.neige.neigeitems.command.selector.WorldSelector;
  
  import java.util.Collection;
  import java.util.Collections;
  import java.util.concurrent.CompletableFuture;
  
  /**
   * 世界参数类型
   */
  public class WorldArgumentType implements ArgumentType<WorldSelector> {
      private static final Collection<String> EXAMPLES = Collections.singletonList("world");
  
      private WorldArgumentType() {
      }
  
      public static @NonNull WorldArgumentType world() {
          return new WorldArgumentType();
      }
  
      public static @Nullable World getWorld(
              @NonNull CommandContext<CommandSender> context,
              @NonNull String name
      ) {
          return getWorldSelector(context, name).select(context);
      }
  
      public static @NonNull WorldSelector getWorldSelector(
              @NonNull CommandContext<CommandSender> context,
              @NonNull String name
      ) {
          return context.getArgument(name, WorldSelector.class);
      }
  
      @Override
      public @NonNull WorldSelector parse(
              @NonNull StringReader reader
      ) {
          return new WorldSelector(reader);
      }
  
      @Override
      public <S> @NonNull CompletableFuture<Suggestions> listSuggestions(
              @NonNull CommandContext<S> context,
              @NonNull SuggestionsBuilder builder
      ) {
          val lowerCaseRemaining = builder.getRemaining().toLowerCase();
          Bukkit.getWorlds().forEach((world) -> {
              val name = world.getName();
              if (name.toLowerCase().startsWith(lowerCaseRemaining)) {
                  builder.suggest(name);
              }
          });
          return builder.buildFuture();
      }
  
      @Override
      public @NonNull Collection<String> getExamples() {
          return EXAMPLES;
      }
  }
  