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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.
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/*
 * Copyright 2008 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;

/**
 * A handler for at rules.
 *
 */
public interface AtRuleHandler {
  /**
   * @return {@code true} if the contents of the rule should be visited,
   *     false otherwise. {@link #leaveConditionalRule(CssConditionalRuleNode)}
   *     will still be called.
   */
  boolean enterConditionalRule(CssConditionalRuleNode node);

  /** Called after visiting a {@code CssConditionalRuleNode}'s sub trees */
  void leaveConditionalRule(CssConditionalRuleNode node);

  /** Called before visiting a {@code CssImportRuleNode}'s sub trees */
  boolean enterImportRule(CssImportRuleNode node);

  /** Called after visiting a {@code CssImportRuleNode}'s sub trees */
  void leaveImportRule(CssImportRuleNode node);

  /** Called before visiting a {@code CssMediaRuleNode}'s sub trees */
  boolean enterMediaRule(CssMediaRuleNode node);

  /** Called after visiting a {@code CssMediaRuleNode}'s sub trees */
  void leaveMediaRule(CssMediaRuleNode node);

  /** Called before visiting a {@code CssPageRuleNode}'s sub trees */
  boolean enterPageRule(CssPageRuleNode node);

  /** Called after visiting a {@code CssPageRuleNode}'s sub trees */
  void leavePageRule(CssPageRuleNode node);

  /** Called before visiting a {@code CssPageSelectorNode}'s sub trees */
  boolean enterPageSelector(CssPageSelectorNode node);

  /** Called after visiting a {@code CssPageSelectorNode}'s sub trees */
  void leavePageSelector(CssPageSelectorNode node);

  /** Called before visiting a {@code CssFontFaceNode}'s sub trees */
  boolean enterFontFace(CssFontFaceNode node);

  /** Called after visiting a {@code CssFontFaceNode}'s sub trees */
  void leaveFontFace(CssFontFaceNode node);

  /**
   * @return {@code true} if the contents of the rule should be visited,
   *     false otherwise. {@link #leaveDefinition(CssDefinitionNode)}
   *     will still be called.
   */
  boolean enterDefinition(CssDefinitionNode node);

  /** Called after visiting a {@code CssDefinitionNode}'s sub trees */
  void leaveDefinition(CssDefinitionNode node);

  /** Called before visiting a {@code CssUnknownAtRuleNode}'s sub trees */
  boolean enterUnknownAtRule(CssUnknownAtRuleNode node);

  /** Called after visiting a {@code CssUnknownAtRuleNode}'s sub trees */
  void leaveUnknownAtRule(CssUnknownAtRuleNode node);

  /** Called between adjacent nodes in a media type list */
  boolean enterMediaTypeListDelimiter(CssNodesListNode node);

  /** Called between adjacent nodes in a media type list */
  void leaveMediaTypeListDelimiter(CssNodesListNode node);

  /** Called before visiting a {@code CssComponentNode}'s sub trees */
  boolean enterComponent(CssComponentNode node);

  /** Called after visiting a {@code CssComponentNode}'s sub trees */
  void leaveComponent(CssComponentNode node);

  /** Called before visiting a {@code CssKeyframesNode}'s sub trees */
  boolean enterKeyframesRule(CssKeyframesNode node);

  /** Called after visiting a {@code CssKeyframesNode}'s sub trees */
  void leaveKeyframesRule(CssKeyframesNode node);

  /** Called before visiting a {@code CssMixinDefinitionNode}'s sub trees */
  boolean enterMixinDefinition(CssMixinDefinitionNode node);

  /** Called after visiting a {@code CssMixinDefinitionNode}'s sub trees */
  void leaveMixinDefinition(CssMixinDefinitionNode node);

  /** Called before visiting a {@code CssMixinNode}'s sub trees */
  boolean enterMixin(CssMixinNode node);

  /** Called after visiting a {@code CssMixinNode}'s sub trees */
  void leaveMixin(CssMixinNode node);

  /** Called before visiting a {@code CssProvideNode}'s sub trees */
  boolean enterProvideNode(CssProvideNode node);

  /** Called after visiting a {@code CssProvideNode}'s sub trees */
  void leaveProvideNode(CssProvideNode node);

  /** Called before visiting a {@code CssRequireNode}'s sub trees */
  boolean enterRequireNode(CssRequireNode node);

  /** Called after visiting a {@code CssRequireNode}'s sub trees */
  void leaveRequireNode(CssRequireNode node);


}