com.google.gwt.resources.gss.ExtendedConditionalNodeVisitor Maven / Gradle / Ivy
/*
* 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 childrenStack;
public ExtendedConditionalNodeVisitor() {
childrenStack = new Stack();
}
@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) {
}
}