| /* |
| * 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.converter; |
| |
| import com.google.gwt.resources.css.ast.Context; |
| import com.google.gwt.resources.css.ast.CssProperty; |
| import com.google.gwt.resources.css.ast.CssRule; |
| import com.google.gwt.resources.css.ast.CssSprite; |
| import com.google.gwt.resources.css.ast.CssVisitor; |
| |
| import java.util.HashSet; |
| import java.util.List; |
| import java.util.Set; |
| |
| /** |
| * Visitor that adds @alternate annotations where required in CSSRules. |
| */ |
| public class AlternateAnnotationCreatorVisitor extends CssVisitor { |
| |
| @Override |
| public boolean visit(CssRule x, Context ctx) { |
| annotateDuplicateProperties(x.getProperties()); |
| return false; |
| } |
| |
| @Override |
| public boolean visit(CssSprite x, Context ctx) { |
| annotateDuplicateProperties(x.getProperties()); |
| return false; |
| } |
| |
| private void annotateDuplicateProperties(List<CssProperty> properties) { |
| Set<String> duplicatePropertyNames = new HashSet<String>(); |
| Set<String> seenPropertyNames = new HashSet<String>(); |
| |
| for (CssProperty cssProperty : properties) { |
| String name = cssProperty.getName(); |
| if (!seenPropertyNames.contains(name)) { |
| seenPropertyNames.add(name); |
| } else { |
| duplicatePropertyNames.add(name); |
| } |
| } |
| |
| Set<String> seenDuplicatePropertyNames = new HashSet<String>(); |
| |
| for (CssProperty cssProperty : properties) { |
| String name = cssProperty.getName(); |
| if (duplicatePropertyNames.contains(name)) { |
| if (!seenDuplicatePropertyNames.contains(name)) { |
| seenDuplicatePropertyNames.add(name); |
| } else { |
| cssProperty.setName("/* @alternate */ " + name); |
| } |
| } |
| } |
| } |
| } |