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

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/*
 * 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.css.Selectable;
import br.com.objectos.css.Selector;

/**
 * @author [email protected] (Marcio Endo)
 */
enum SiblingOperator {

  ADJACENT('+') {
    @Override
    public void finalizer(SelectorBuilder builder) {
      builder.adjacentSibling();
    }

    @Override
    public boolean matches(SiblingSelector selector, Selectable element) {
      return selector.firstMatches(element)
          && element.sibling()
              .filter(el -> selector.secondMatches(el))
              .isPresent();
    }
  },

  GENERAL('~') {
    @Override
    public void finalizer(SelectorBuilder builder) {
      builder.generalSibling();
    }

    @Override
    public boolean matches(SiblingSelector selector, Selectable element) {
      return selector.firstMatches(element)
          && siblingStream(element)
              .filter(el -> selector.secondMatches(el))
              .findFirst()
              .isPresent();
    }

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

  private final Keyword keyword;
  private final String separator;

  private SiblingOperator(char symbol) {
    keyword = Keyword.of(symbol);
    separator = " " + symbol + " ";
  }

  public abstract void finalizer(SelectorBuilder builder);

  public Keyword keyword() {
    return keyword;
  }

  public abstract boolean matches(SiblingSelector selector, Selectable element);

  public SiblingSelector selector(Selector first, Selector second) {
    return new SiblingSelector(this, first, second);
  }

  public String separator() {
    return separator;
  }

}