/*
* Copyright 2009 Guy Van den Broeck
*
* 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 org.outerj.daisy.diff.html;
import java.io.StringReader;
import java.io.StringWriter;
import java.util.Locale;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.sax.SAXTransformerFactory;
import javax.xml.transform.sax.TransformerHandler;
import javax.xml.transform.stream.StreamResult;
import org.outerj.daisy.diff.helper.NekoHtmlParser;
import org.outerj.daisy.diff.html.dom.DomTreeBuilder;
import org.xml.sax.ContentHandler;
import org.xml.sax.InputSource;
import com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactoryImpl;
/**
* TestCase for HTML diffing. Can be used in unit tests. See HTMLDifferText for
* example.
*
* @author kapelonk
*
*/
public class HtmlTestFixture {
/**
* This class has only static methods.
*/
private HtmlTestFixture() {
// Disabled
}
/**
* Performs HTML diffing on two HTML strings. Notice that the input strings
* are "cleaned-up" first (e.g. all html tags are converted to lowercase).
*
* @param first
* original html text
* @param second
* modified html text
* @return the result
* @throws Exception
* something went wrong.
*/
public static String diff(String first, String second) throws Exception {
StringWriter finalResult = new StringWriter();
SAXTransformerFactory tf = new TransformerFactoryImpl();
TransformerHandler result = tf.newTransformerHandler();
result.setResult(new StreamResult(finalResult));
result.getTransformer().setOutputProperty(
OutputKeys.OMIT_XML_DECLARATION, "yes");
ContentHandler postProcess = result;
Locale locale = Locale.getDefault();
String prefix = "diff";
NekoHtmlParser cleaner = new NekoHtmlParser();
InputSource oldSource = new InputSource(new StringReader(first));
InputSource newSource = new InputSource(new StringReader(second));
DomTreeBuilder oldHandler = new DomTreeBuilder();
cleaner.parse(oldSource, oldHandler);
TextNodeComparator leftComparator = new TextNodeComparator(oldHandler,
locale);
DomTreeBuilder newHandler = new DomTreeBuilder();
cleaner.parse(newSource, newHandler);
TextNodeComparator rightComparator = new TextNodeComparator(newHandler,
locale);
HtmlSaxDiffOutput output = new HtmlSaxDiffOutput(postProcess, prefix);
// Debug code
// LCSSettings settings = new LCSSettings();
// settings.setUseGreedyMethod(false);
// // settings.setPowLimit(1.5);
// // settings.setTooLong(100000*100000);
//
// RangeDifference[] differences = RangeDifferencer.findDifferences(
// settings, leftComparator, rightComparator);
// LOG.info(">>>>Number of diffs is "+differences.length);
// End of debug code
HTMLDiffer differ = new HTMLDiffer(output);
differ.diff(leftComparator, rightComparator);
return finalResult.toString();
}
}