StringResolvingMatchedTokenConsumer.java

/*
 * This file is part of adventure, licensed under the MIT License.
 *
 * Copyright (c) 2017-2022 KyoriPowered
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package net.kyori.adventure.text.minimessage.internal.parser.match;

import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
import net.kyori.adventure.text.minimessage.internal.TagInternals;
import net.kyori.adventure.text.minimessage.internal.parser.Token;
import net.kyori.adventure.text.minimessage.internal.parser.TokenParser;
import net.kyori.adventure.text.minimessage.internal.parser.TokenParser.TagProvider;
import net.kyori.adventure.text.minimessage.internal.parser.TokenType;
import net.kyori.adventure.text.minimessage.internal.parser.node.TagPart;
import net.kyori.adventure.text.minimessage.tag.PreProcess;
import net.kyori.adventure.text.minimessage.tag.Tag;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import static net.kyori.adventure.text.minimessage.internal.parser.TokenParser.SEPARATOR;
import static net.kyori.adventure.text.minimessage.internal.parser.TokenParser.tokenize;

/**
 * A matched token consumer that produces a string and returns a copy of the string with {@link PreProcess} tags resolved.
 *
 * @since 4.10.0
 */
public final class StringResolvingMatchedTokenConsumer extends MatchedTokenConsumer<String> {
  private final StringBuilder builder;
  private final TagProvider tagProvider;

  /**
   * Creates a string resolving matched token consumer.
   *
   * @param input the input
   * @param tagProvider the resolver for argument-less tags
   * @since 4.10.0
   */
  public StringResolvingMatchedTokenConsumer(
    final @NotNull String input,
    final @NotNull TagProvider tagProvider
  ) {
    super(input);
    this.builder = new StringBuilder(input.length());
    this.tagProvider = tagProvider;
  }

  @Override
  public void accept(final int start, final int end, final @NotNull TokenType tokenType) {
    super.accept(start, end, tokenType);

    if (tokenType != TokenType.OPEN_TAG) {
      // just add it normally, we don't care about other tags
      this.builder.append(this.input, start, end);
    } else {
      // well, now we need to work out if it's a tag or a placeholder!
      final String match = this.input.substring(start, end);
      final String cleanup = this.input.substring(start + 1, end - 1);

      final int index = cleanup.indexOf(SEPARATOR);
      final String tag = index == -1 ? cleanup : cleanup.substring(0, index);

      // we might care if it's a valid tag!
      if (TagInternals.sanitizeAndCheckValidTagName(tag)) {
        final List<Token> tokens = tokenize(match, false);
        final List<TagPart> parts = new ArrayList<>();
        final List<Token> childs = tokens.isEmpty() ? null : tokens.get(0).childTokens();
        if (childs != null) {
          for (int i = 1; i < childs.size(); i++) {
            parts.add(new TagPart(match, childs.get(i), this.tagProvider));
          }
        }
        // we might care if it's a pre-process!
        final @Nullable Tag replacement = this.tagProvider.resolve(TokenParser.TagProvider.sanitizePlaceholderName(tag), parts, tokens.get(0));

        if (replacement instanceof PreProcess) {
          this.builder.append(Objects.requireNonNull(((PreProcess) replacement).value(), "PreProcess replacements cannot return null"));
          return;
        }
      }

      // if we get here, the placeholder wasn't found or was null
      this.builder.append(match);
    }
  }

  @Override
  public @NotNull String result() {
    return this.builder.toString();
  }
}