/**
* 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.lexer.*;
import com.google.caja.parser.html.DomParser;
import com.google.caja.reporting.MessageQueue;
import com.google.caja.reporting.SimpleMessageQueue;
import com.google.inject.Inject;
import com.google.inject.name.Named;
import org.apache.shindig.gadgets.GadgetException;
import org.apache.shindig.gadgets.http.HttpResponse;
import org.apache.shindig.gadgets.parse.GadgetHtmlParser;
import org.apache.shindig.gadgets.parse.HtmlSerialization;
import org.w3c.dom.DOMImplementation;
import org.w3c.dom.Document;
import org.w3c.dom.DocumentFragment;
/**
* Simple html parser based on caja.
*/
public class VanillaCajaHtmlParser extends GadgetHtmlParser {
private final boolean needsDebugData;
@Inject
public VanillaCajaHtmlParser(DOMImplementation documentFactory,
@Named("vanillaCajaParser.needsDebugData")
boolean needsDebugData) {
super(documentFactory);
this.needsDebugData = needsDebugData;
}
@Override
public Document parseDom(String source) throws GadgetException {
// TODO: Add support for caching the DOM after evaluation.
return parseDomImpl(source);
}
private DomParser getDomParser(String source, final MessageQueue mq) throws ParseException {
InputSource is = InputSource.UNKNOWN;
HtmlLexer lexer = new HtmlLexer(CharProducer.Factory.fromString(source, is));
TokenQueue<HtmlTokenType> tokenQueue = new TokenQueue<HtmlTokenType>(
lexer, is);
DomParser parser = new DomParser(tokenQueue, /** asXml */ false, mq);
parser.setDomImpl(documentFactory);
parser.setNeedsDebugData(needsDebugData);
return parser;
}
@Override
protected Document parseDomImpl(String source) throws GadgetException {
MessageQueue mq = new SimpleMessageQueue();
try {
DomParser parser = getDomParser(source, mq);
Document doc = parser.parseDocument().getOwnerDocument();
VanillaCajaHtmlSerializer serializer = new VanillaCajaHtmlSerializer();
HtmlSerialization.attach(doc, serializer, null);
return doc;
} catch (ParseException e) {
throw new GadgetException(GadgetException.Code.HTML_PARSE_ERROR,
e.getCajaMessage().toString(), HttpResponse.SC_INTERNAL_SERVER_ERROR);
} catch (NullPointerException e) {
throw new GadgetException(GadgetException.Code.INTERNAL_SERVER_ERROR, e);
}
}
@Override
protected DocumentFragment parseFragmentImpl(String source)
throws GadgetException {
throw new UnsupportedOperationException("Use parseDom instead.");
}
}