com.google.gwt.resources.gss.RuntimeConditionalBlockCollector 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.resources.gss.ast.CssRuntimeConditionalRuleNode;
import com.google.gwt.thirdparty.common.css.compiler.ast.CssCompilerPass;
import com.google.gwt.thirdparty.common.css.compiler.ast.CssConditionalBlockNode;
import com.google.gwt.thirdparty.common.css.compiler.ast.CssConditionalRuleNode;
import com.google.gwt.thirdparty.common.css.compiler.ast.DefaultTreeVisitor;
import com.google.gwt.thirdparty.common.css.compiler.ast.VisitController;
import java.util.HashSet;
import java.util.Set;
/**
* Visitor that collects conditional blocks containing conditions that need to be evaluated at
* runtime.
*/
public class RuntimeConditionalBlockCollector extends DefaultTreeVisitor implements
CssCompilerPass {
private final VisitController visitController;
private Set runtimeConditionalBlock;
public RuntimeConditionalBlockCollector(VisitController visitController) {
this.visitController = visitController;
}
@Override
public boolean enterConditionalBlock(CssConditionalBlockNode block) {
for (CssConditionalRuleNode currentConditional : block.childIterable()) {
if (currentConditional instanceof CssRuntimeConditionalRuleNode) {
runtimeConditionalBlock.add(block);
return true;
}
}
return true;
}
@Override
public void runPass() {
runtimeConditionalBlock = new HashSet();
visitController.startVisit(this);
}
public Set getRuntimeConditionalBlock() {
return runtimeConditionalBlock;
}
}