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This OSGi bundle wraps ${pkgArtifactId} ${pkgVersion} jar file.
/*
* 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.core.ext.typeinfo.JClassType;
import com.google.gwt.resources.rg.GssResourceGenerator;
import com.google.gwt.thirdparty.common.css.compiler.ast.CssClassSelectorNode;
import com.google.gwt.thirdparty.common.css.compiler.ast.CssTree;
import com.google.gwt.thirdparty.common.css.compiler.ast.DefaultTreeVisitor;
import com.google.gwt.thirdparty.guava.common.base.Preconditions;
import java.util.HashSet;
import java.util.Set;
import java.util.SortedSet;
import java.util.TreeSet;
/**
* Collect all CSS class names in a stylesheet.
*/
public class ClassNamesCollector extends DefaultTreeVisitor {
private Set classNames;
private SortedSet excludedPrefixes;
/**
* Extract all CSS class names in the provided stylesheet.
*/
public Set getClassNames(CssTree tree) {
return getClassNames(tree, new HashSet());
}
/**
* Extract all CSS class names in the provided stylesheet, modulo those
* imported from another context.
*/
public Set getClassNames(CssTree tree, Set imports) {
Preconditions.checkNotNull(tree, "tree cannot be null");
Preconditions.checkNotNull(imports, "imports set cannot be null");
classNames = new HashSet();
excludedPrefixes = new TreeSet();
for (JClassType importedType : imports) {
excludedPrefixes.add(GssResourceGenerator.getImportPrefix(importedType));
}
tree.getVisitController().startVisit(this);
return classNames;
}
@Override
public boolean enterClassSelector(CssClassSelectorNode classSelector) {
String className = classSelector.getRefinerName();
if (!isImportedClass(className)) {
classNames.add(className);
}
return false;
}
private boolean isImportedClass(String className) {
SortedSet lowerPrefixes = excludedPrefixes.headSet(className);
return !lowerPrefixes.isEmpty() && className.startsWith(lowerPrefixes.last());
}
}