/**
* This file is part of Jahia, next-generation open source CMS:
* Jahia's next-generation, open source CMS stems from a widely acknowledged vision
* of enterprise application convergence - web, search, document, social and portal -
* unified by the simplicity of web content management.
*
* For more information, please visit http://www.jahia.com.
*
* Copyright (C) 2002-2011 Jahia Solutions Group SA. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* As a special exception to the terms and conditions of version 2.0 of
* the GPL (or any later version), you may redistribute this Program in connection
* with Free/Libre and Open Source Software ("FLOSS") applications as described
* in Jahia's FLOSS exception. You should have received a copy of the text
* describing the FLOSS exception, and it is also available here:
* http://www.jahia.com/license
*
* Commercial and Supported Versions of the program (dual licensing):
* alternatively, commercial and supported versions of the program may be used
* in accordance with the terms and conditions contained in a separate
* written agreement between you and Jahia Solutions Group SA.
*
* If you are unsure which license is appropriate for your use,
* please contact the sales department at sales@jahia.com.
*/
package org.jahia.ajax.gwt.helper;
import net.htmlparser.jericho.Source;
import net.htmlparser.jericho.SourceCompactor;
import net.htmlparser.jericho.SourceFormatter;
import org.slf4j.Logger;
import org.jahia.api.Constants;
import org.jahia.bin.Jahia;
import org.outerj.daisy.diff.HtmlCleaner;
import org.outerj.daisy.diff.XslFilter;
import org.outerj.daisy.diff.html.HTMLDiffer;
import org.outerj.daisy.diff.html.HtmlSaxDiffOutput;
import org.outerj.daisy.diff.html.TextNodeComparator;
import org.outerj.daisy.diff.html.dom.DomTreeBuilder;
import org.xml.sax.ContentHandler;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.AttributesImpl;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.sax.SAXTransformerFactory;
import javax.xml.transform.sax.TransformerHandler;
import javax.xml.transform.stream.StreamResult;
import java.io.StringReader;
import java.io.StringWriter;
import java.util.Locale;
/**
* HTML compare utility.
* User: ktlili
* Date: Mar 4, 2010
* Time: 3:29:13 PM
*/
public class DiffHelper {
private static final transient Logger logger = org.slf4j.LoggerFactory.getLogger(DiffHelper.class);
public String getHighlighted(String original, String amendment) {
final StringWriter sw = new StringWriter();
try {
final SAXTransformerFactory tf = (SAXTransformerFactory) TransformerFactory.newInstance();
final TransformerHandler result = tf.newTransformerHandler();
result.setResult(new StreamResult(sw));
final XslFilter filter = new XslFilter();
// replace /live/ by /default/ in href and src attributes as it represents same image
if(original.contains("/files/"+Constants.EDIT_WORKSPACE+"/")||amendment.contains("/files/"+Constants.EDIT_WORKSPACE+"/")) {
original = original.replaceAll("/"+ Constants.LIVE_WORKSPACE+"/","/"+Constants.EDIT_WORKSPACE+"/");
amendment = amendment.replaceAll("/"+ Constants.LIVE_WORKSPACE+"/","/"+Constants.EDIT_WORKSPACE+"/");
}
original = new SourceFormatter(new Source(original)).toString();
amendment = new SourceFormatter(new Source(amendment)).toString();
final ContentHandler postProcess = filter.xsl(result, "jahiahtmlheader.xsl");
final Locale locale = Locale.ENGLISH;
final String prefix = "diff";
final HtmlCleaner cleaner = new HtmlCleaner();
final InputSource oldSource = new InputSource(new StringReader(original));
final InputSource newSource = new InputSource(new StringReader(amendment));
final DomTreeBuilder oldHandler = new DomTreeBuilder();
cleaner.cleanAndParse(oldSource, oldHandler);
final TextNodeComparator leftComparator = new TextNodeComparator(oldHandler, locale);
final DomTreeBuilder newHandler = new DomTreeBuilder();
cleaner.cleanAndParse(newSource, newHandler);
final TextNodeComparator rightComparator = new TextNodeComparator(newHandler, locale);
postProcess.startDocument();
postProcess.startElement("", "diffreport", "diffreport",new AttributesImpl());
addDiffCss(postProcess);
postProcess.startElement("", "diff", "diff", new AttributesImpl());
final HtmlSaxDiffOutput output = new HtmlSaxDiffOutput(postProcess,prefix);
final HTMLDiffer differ = new HTMLDiffer(output);
differ.diff(rightComparator, leftComparator);
postProcess.endElement("", "diff", "diff");
postProcess.endElement("", "diffreport", "diffreport");
postProcess.endDocument();
} catch (Throwable e) {
logger.error(e.getMessage(), e);
}
return sw.toString();
}
/**
* add css
* @param handler
* @throws org.xml.sax.SAXException
*/
private void addDiffCss(ContentHandler handler) throws SAXException {
handler.startElement("", "css", "css",new AttributesImpl());
AttributesImpl attr = new AttributesImpl();
attr.addAttribute("", "href", "href", "CDATA", Jahia.getContextPath()+"/gwt/resources/css/diff.css");
attr.addAttribute("", "type", "type", "CDATA", "text/css");
attr.addAttribute("", "rel", "rel", "CDATA", "stylesheet");
handler.startElement("", "link", "link",attr);
handler.endElement("", "link", "link");
handler.endElement("", "css", "css");
}
}