/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.shindig.gadgets.parse.caja;
import com.google.caja.parser.AncestorChain;
import com.google.caja.parser.Visitor;
import com.google.caja.parser.css.CssTree;
import com.google.common.collect.Lists;
import java.util.List;
/**
* Utility functions for traversing Caja's CSS DOM
*/
class CajaCssUtils {
/**
* Get the immediate children of the passed node with the specified node type
*/
public static <T extends CssTree> List<T> children(CssTree node, Class<T> nodeType) {
List<T> result = Lists.newArrayList();
for (CssTree child : node.children()) {
if (nodeType.isAssignableFrom(child.getClass())) {
result.add(nodeType.cast(child));
}
}
return result;
}
/**
* Get all descendants of the passed node with the specified node type
*/
public static <T extends CssTree> List<T> descendants(CssTree node, final Class<T> nodeType) {
final List<T> descendants = Lists.newArrayList();
node.acceptPreOrder(new Visitor() {
public boolean visit(AncestorChain<?> ancestorChain) {
if (nodeType.isAssignableFrom(ancestorChain.node.getClass())) {
descendants.add(nodeType.cast(ancestorChain.node));
}
return true;
}
}, null);
return descendants;
}
}