| /* |
| * Copyright 2014 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.gwt.resources.gss; |
| |
| import com.google.gwt.thirdparty.common.css.compiler.ast.CssBooleanExpressionNode; |
| import com.google.gwt.thirdparty.common.css.compiler.ast.CssConditionalRuleNode; |
| import com.google.gwt.thirdparty.common.css.compiler.ast.CssValueNode; |
| import com.google.gwt.thirdparty.common.css.compiler.ast.DefaultTreeVisitor; |
| |
| import java.util.Stack; |
| |
| /** |
| * GSS doesn't visit the children of a CssConditionalRuleNode. The role of this class |
| * is to implement this behavior. |
| */ |
| public class ExtendedConditionalNodeVisitor extends DefaultTreeVisitor { |
| |
| private final Stack<CssBooleanExpressionNode> childrenStack; |
| |
| public ExtendedConditionalNodeVisitor() { |
| childrenStack = new Stack<CssBooleanExpressionNode>(); |
| } |
| |
| @Override |
| public boolean enterConditionalRule(CssConditionalRuleNode node) { |
| // unfortunately the VisitController doesn't visit the children of a CssConditionalRuleNode |
| for (CssValueNode children : node.getChildren()) { |
| if (children instanceof CssBooleanExpressionNode) { |
| childrenStack.push((CssBooleanExpressionNode) children); |
| } |
| } |
| |
| while (!childrenStack.isEmpty()) { |
| CssBooleanExpressionNode visitingNode = childrenStack.pop(); |
| enterBooleanExpression(visitingNode); |
| |
| if (visitingNode.getLeft() != null) { |
| childrenStack.push(visitingNode.getLeft()); |
| } |
| if (visitingNode.getRight() != null) { |
| childrenStack.push(visitingNode.getRight()); |
| } |
| } |
| |
| return true; |
| } |
| |
| public void enterBooleanExpression(CssBooleanExpressionNode node) { |
| } |
| } |