com.google.common.css.compiler.ast.CssCompositeValueNode Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of closure-stylesheets Show documentation

Closure Stylesheets is an extension to CSS that adds variables, functions, conditionals, and mixins to standard CSS. The tool also supports minification, linting, RTL flipping, and CSS class renaming.

There is a newer version: 20160212

Show newest version

/*
 * Copyright 2009 Google Inc.
 *
 * 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 com.google.common.css.compiler.ast;

import com.google.common.base.Joiner;
import com.google.common.collect.Lists;
import com.google.common.css.SourceCodeLocation;

import java.util.List;

import javax.annotation.Nullable;

/**
 * A node that contains a list of value nodes that together represent one logical
 * value. For example, font-family alternatives like {@code Arial, Helvetica,
 * Sans-sherif} are logically one value in the {@code font} declaration. Likewise
 * the font size specification {@code 12pt/14pt} contains two values (the font
 * size and line height) that are really logically one value.
 *
 * @author [email protected] (Oana Florescu)
 */
public class CssCompositeValueNode extends CssValueNode {
  private List values;
  private Operator operator;

  /**
   * Contains the list of recognized operators.
   */
  public enum Operator {
    SPACE(" "),
    COMMA(","),
    SLASH("/"),
    EQUALS("="),
    UNKNOWN(null);

    private final String operatorName;

    private Operator(String operatorName) {
      this.operatorName = operatorName;
    }

    public String getOperatorName() {
      return operatorName;
    }

    public static Operator valueOf(char c) {
      switch (c) {
        case ',':
          return COMMA;
        case '/':
          return SLASH;
        case '=':
          return EQUALS;
        default:
          return UNKNOWN;
      }
    }

    /**
     * For debugging only.
     * TODO(oana): Get rid of the toString method from all enums.
     */
    @Override
    public String toString() {
      return getOperatorName();
    }
  }


  /**
   * Constructor of a composite value node.
   *
   * @param compositeValues List of composite values
   * @param operator Operator that connects the values
   * @param sourceCodeLocation The location of the code
   */
  public CssCompositeValueNode(
      List compositeValues,
      Operator operator,
      @Nullable SourceCodeLocation sourceCodeLocation) {
    super(null, sourceCodeLocation);
    this.operator = operator;
    this.values = Lists.newArrayList(compositeValues);
    becomeParentForNodes(values);
  }

  /**
   * Copy constructor for a composite value node.
   *
   * @param node The composite node to copy
   */
  public CssCompositeValueNode(CssCompositeValueNode node) {
    this(deepCopyCompositeValues(node.getValues()), node.getOperator(),
        node.getSourceCodeLocation());
  }

  private static List deepCopyCompositeValues(
      List compositeValues) {
    List copy = Lists.newArrayList();
    for (CssValueNode child : compositeValues) {
      copy.add(child.deepCopy());
    }
    return copy;
  }

  @Override
  public CssCompositeValueNode deepCopy() {
    return new CssCompositeValueNode(this);
  }

  public List getValues() {
    return values;
  }

  /**
   * Adds a value to the list of values.
   *
   * @param value The value to be added to the list
   */
  public void addValue(CssValueNode value) {
    values.add(value);
    becomeParentForNode(value);
  }

  public Operator getOperator() {
    return operator;
  }

  @Override
  public String toString() {
    return Joiner.on(operator.getOperatorName()).join(values);
  }
}