| /* |
| * 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.CssBooleanExpressionNode.Type; |
| import com.google.gwt.thirdparty.common.css.compiler.ast.CssCompilerPass; |
| import com.google.gwt.thirdparty.common.css.compiler.ast.MutatingVisitController; |
| import com.google.gwt.thirdparty.guava.common.collect.ImmutableSet; |
| |
| import java.util.HashSet; |
| import java.util.Set; |
| import java.util.regex.Matcher; |
| |
| /** |
| * Visitor that collects the simple boolean conditions that are mapped to configuration |
| * properties. |
| * <p> |
| * <code> |
| * |
| * @if (MY_PROPERTY) { |
| * ... |
| * } |
| * </code> |
| * <p>will be evaluated to true if and only if a configuration property with the same name is set |
| * to the value "true": |
| * {@code |
| * <set-configuration-property name="MY_PROPERTY" value="true" /> |
| * } |
| */ |
| public class BooleanConditionCollector extends ExtendedConditionalNodeVisitor |
| implements CssCompilerPass { |
| private final MutatingVisitController delegate; |
| private final Set<String> booleanConditions; |
| |
| public BooleanConditionCollector(MutatingVisitController delegate) { |
| this.delegate = delegate; |
| booleanConditions = new HashSet<String>(); |
| } |
| |
| @Override |
| public void enterBooleanExpression(CssBooleanExpressionNode booleanExpressionNode) { |
| if (booleanExpressionNode.getType() == Type.CONSTANT) { |
| |
| Matcher m = PermutationsCollector.IS_FUNCTION.matcher(booleanExpressionNode.getValue()); |
| |
| if (!m.matches()) { |
| booleanConditions.add(booleanExpressionNode.getValue()); |
| } |
| } |
| } |
| |
| public Set<String> getBooleanConditions() { |
| return ImmutableSet.copyOf(booleanConditions); |
| } |
| |
| @Override |
| public void runPass() { |
| delegate.startVisit(this); |
| } |
| } |