com.google.gwt.resources.converter.AlternateAnnotationCreatorVisitor 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.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 properties) {
Set duplicatePropertyNames = new HashSet();
Set seenPropertyNames = new HashSet();
for (CssProperty cssProperty : properties) {
String name = cssProperty.getName();
if (!seenPropertyNames.contains(name)) {
seenPropertyNames.add(name);
} else {
duplicatePropertyNames.add(name);
}
}
Set seenDuplicatePropertyNames = new HashSet();
for (CssProperty cssProperty : properties) {
String name = cssProperty.getName();
if (duplicatePropertyNames.contains(name)) {
if (!seenDuplicatePropertyNames.contains(name)) {
seenDuplicatePropertyNames.add(name);
} else {
cssProperty.setName("/* @alternate */ " + name);
}
}
}
}
}