/*
* 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.passes;
import com.google.common.base.Preconditions;
import com.google.common.css.compiler.ast.CssCompilerPass;
import com.google.common.css.compiler.ast.CssConditionalBlockNode;
import com.google.common.css.compiler.ast.CssConditionalRuleNode;
import com.google.common.css.compiler.ast.DefaultTreeVisitor;
import com.google.common.css.compiler.ast.VisitController;
/**
*/
public class HasConditionalNodes extends DefaultTreeVisitor
implements CssCompilerPass {
private final VisitController visitController;
private boolean hasConditionalNodes = false;
private boolean passWasRun = false;
HasConditionalNodes(VisitController visitController) {
this.visitController = visitController;
}
@Override
public boolean enterConditionalBlock(CssConditionalBlockNode block) {
// assert !block.isEmpty();
hasConditionalNodes = true;
visitController.stopVisit();
return true;
}
@Override
public boolean enterConditionalRule(CssConditionalRuleNode node) {
// This should never get called as the visit should stop at the enclosing
// conditional block of the first conditional rule.
// assert false;
return false;
}
@Override
public void runPass() {
visitController.startVisit(this);
passWasRun = true;
}
public boolean hasConditionalNodes() {
Preconditions.checkState(passWasRun);
return hasConditionalNodes;
}
}