br.com.objectos.css.io.DescendantSelector Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of reader Show documentation
The newest version!
/*
 * Copyright 2016 Objectos, Fábrica de Software LTDA.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package br.com.objectos.css.io;

import java.util.stream.Stream;

import br.com.objectos.codereader.Keyword;
import br.com.objectos.core.lang.Strings;
import br.com.objectos.css.Selectable;
import br.com.objectos.css.Selector;

/**
 * @author [email protected] (Marcio Endo)
 */
class DescendantSelector extends AbstractCombinatorSelector {

  private static final SelectorAction ACTION = new AbstractKeywordSelectorAction(Keyword.whitespace()) {
    @Override
    public void execute(SelectorReader reader) {
      String maybeName = reader.get();

      if (!Strings.isNullOrEmpty(maybeName)) {
        reader.add(CssSelectors.tag(maybeName));
      }

      reader.acceptBuilderFinalizer(b -> b.descendant());
    }
  };

  private static SelectorAction FINALIZER = new SelectorAction() {
    @Override
    public boolean matches(SelectorReader reader) {
      return reader.empty();
    }

    @Override
    public void execute(SelectorReader reader) {
      reader.acceptBuilderFinalizer(b -> b.descendant());
    }
  };

  public DescendantSelector(Selector first, Selector second) {
    super(first, second);
  }

  public static SelectorAction action() {
    return ACTION;
  }

  public static SelectorAction finalizerAction() {
    return FINALIZER;
  }

  @Override
  public boolean matches(Selectable element) {
    return secondMatches(element)
        && parentStream(element)
            .filter(el -> firstMatches(el))
            .findAny()
            .isPresent();
  }

  @Override
  String toStringSeparator() {
    return " ";
  }

  private Stream parentStream(Selectable element) {
    return element.parent()
        .map(el -> Stream.concat(Stream.of(el), parentStream(el)))
        .orElse(Stream.of());
  }

}