mirror of git://gcc.gnu.org/git/gcc.git
806 lines
26 KiB
Java
806 lines
26 KiB
Java
/* TransformerImpl.java --
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Copyright (C) 2004,2005,2006 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.xml.transform;
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import gnu.java.lang.CPStringBuilder;
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import java.io.BufferedOutputStream;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.io.UnsupportedEncodingException;
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import java.io.Writer;
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import java.net.MalformedURLException;
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import java.net.UnknownServiceException;
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import java.net.URL;
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import java.net.URLConnection;
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import java.util.Collection;
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import java.util.Iterator;
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import java.util.LinkedList;
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import java.util.List;
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import java.util.Properties;
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import java.util.StringTokenizer;
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import javax.xml.namespace.QName;
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import javax.xml.transform.ErrorListener;
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import javax.xml.transform.OutputKeys;
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import javax.xml.transform.Result;
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import javax.xml.transform.Source;
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import javax.xml.transform.Transformer;
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import javax.xml.transform.TransformerConfigurationException;
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import javax.xml.transform.TransformerException;
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import javax.xml.transform.URIResolver;
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import javax.xml.transform.dom.DOMSource;
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import javax.xml.transform.dom.DOMResult;
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import javax.xml.transform.sax.SAXResult;
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import javax.xml.transform.stream.StreamResult;
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import org.w3c.dom.Document;
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import org.w3c.dom.DocumentType;
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import org.w3c.dom.DOMImplementation;
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import org.w3c.dom.Node;
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import org.w3c.dom.Text;
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import org.xml.sax.ContentHandler;
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import org.xml.sax.SAXException;
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import org.xml.sax.ext.LexicalHandler;
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import gnu.xml.dom.DomDoctype;
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import gnu.xml.dom.DomDocument;
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import gnu.xml.dom.ls.WriterOutputStream;
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/**
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* The transformation process for a given stylesheet.
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*
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* @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
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*/
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class TransformerImpl
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extends Transformer
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{
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final TransformerFactoryImpl factory;
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final Stylesheet stylesheet;
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URIResolver uriResolver;
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ErrorListener errorListener;
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Properties outputProperties;
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TransformerImpl(TransformerFactoryImpl factory,
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Stylesheet stylesheet,
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Properties outputProperties)
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throws TransformerConfigurationException
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{
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this.factory = factory;
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uriResolver = factory.userResolver;
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errorListener = factory.userListener;
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this.stylesheet = stylesheet;
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this.outputProperties = outputProperties;
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if (stylesheet != null)
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{
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// Set up parameter context for this transformer
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stylesheet.bindings.push(Bindings.PARAM);
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}
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}
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public void transform(Source xmlSource, Result outputTarget)
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throws TransformerException
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{
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// Get the source tree
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DOMSource source;
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synchronized (factory.resolver)
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{
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factory.resolver.setUserResolver(uriResolver);
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factory.resolver.setUserListener(errorListener);
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source = factory.resolver.resolveDOM(xmlSource, null, null);
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}
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Node context = source.getNode();
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Document doc = (context instanceof Document) ? (Document) context :
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context.getOwnerDocument();
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if (doc instanceof DomDocument)
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{
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// Suppress mutation events
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((DomDocument) doc).setBuilding(true);
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}
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// Get the result tree
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Node parent = null, nextSibling = null;
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if (outputTarget instanceof DOMResult)
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{
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DOMResult dr = (DOMResult) outputTarget;
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parent = dr.getNode();
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nextSibling = dr.getNextSibling();
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Document rdoc = (parent instanceof Document) ? (Document) parent :
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parent.getOwnerDocument();
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if (rdoc instanceof DomDocument)
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{
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// Suppress mutation events and allow multiple root elements
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DomDocument drdoc = (DomDocument) rdoc;
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drdoc.setBuilding(true);
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drdoc.setCheckWellformedness(false);
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}
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}
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boolean created = false;
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// Transformation
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if (stylesheet != null)
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{
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if (parent == null)
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{
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// Create a new document to hold the result
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DomDocument resultDoc = new DomDocument();
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resultDoc.setBuilding(true);
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resultDoc.setCheckWellformedness(false);
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parent = resultDoc;
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created = true;
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}
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// Make a copy of the source node, and strip it
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context = context.cloneNode(true);
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strip(stylesheet, context);
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// XSLT transformation
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try
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{
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// Set output properties in the underlying stylesheet
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((TransformerOutputProperties) outputProperties).apply();
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stylesheet.initTopLevelVariables(context);
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TemplateNode t = stylesheet.getTemplate(null, context, false);
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if (t != null)
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{
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stylesheet.current = context;
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t.apply(stylesheet, null, context, 1, 1, parent, nextSibling);
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}
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}
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catch (TransformerException e)
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{
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// Done transforming, reset document
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if (doc instanceof DomDocument)
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((DomDocument) doc).setBuilding(false);
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throw e;
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}
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}
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else
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{
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// Identity transform
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Node clone = context.cloneNode(true);
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if (context.getNodeType() != Node.DOCUMENT_NODE)
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{
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Document resultDoc;
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if (parent == null)
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{
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// Create a new document to hold the result
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DomDocument rd = new DomDocument();
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rd.setBuilding(true);
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rd.setCheckWellformedness(false);
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parent = resultDoc = rd;
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created = true;
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}
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else
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{
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resultDoc = (parent instanceof Document) ?
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(Document) parent :
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parent.getOwnerDocument();
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}
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Document sourceDoc = context.getOwnerDocument();
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if (sourceDoc != resultDoc)
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clone = resultDoc.adoptNode(clone);
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if (nextSibling != null)
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parent.insertBefore(clone, nextSibling);
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else
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parent.appendChild(clone);
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}
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else
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{
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// Cannot append document to another tree
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parent = clone;
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created = true;
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}
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}
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String method = outputProperties.getProperty(OutputKeys.METHOD);
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int outputMethod = "html".equals(method) ? Stylesheet.OUTPUT_HTML :
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"text".equals(method) ? Stylesheet.OUTPUT_TEXT :
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Stylesheet.OUTPUT_XML;
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String encoding = outputProperties.getProperty(OutputKeys.ENCODING);
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String publicId = outputProperties.getProperty(OutputKeys.DOCTYPE_PUBLIC);
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String systemId = outputProperties.getProperty(OutputKeys.DOCTYPE_SYSTEM);
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String version = outputProperties.getProperty(OutputKeys.VERSION);
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boolean omitXmlDeclaration =
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"yes".equals(outputProperties.getProperty(OutputKeys.OMIT_XML_DECLARATION));
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boolean standalone =
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"yes".equals(outputProperties.getProperty(OutputKeys.STANDALONE));
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String mediaType = outputProperties.getProperty(OutputKeys.MEDIA_TYPE);
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String cdataSectionElements =
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outputProperties.getProperty(OutputKeys.CDATA_SECTION_ELEMENTS);
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boolean indent =
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"yes".equals(outputProperties.getProperty(OutputKeys.INDENT));
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if (created && parent instanceof DomDocument)
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{
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// Discover document element
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DomDocument resultDoc = (DomDocument) parent;
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Node root = resultDoc.getDocumentElement();
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// Add doctype if specified
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if (publicId != null || systemId != null)
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{
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if (root != null)
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{
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// We must know the name of the root element to
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// create the document type
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DocumentType doctype = new DomDoctype(resultDoc,
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root.getNodeName(),
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publicId,
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systemId);
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resultDoc.insertBefore(doctype, root);
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}
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}
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resultDoc.setBuilding(false);
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resultDoc.setCheckWellformedness(true);
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}
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else if (publicId != null || systemId != null)
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{
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switch (parent.getNodeType())
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{
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case Node.DOCUMENT_NODE:
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case Node.DOCUMENT_FRAGMENT_NODE:
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Document resultDoc = (parent instanceof Document) ?
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(Document) parent :
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parent.getOwnerDocument();
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DOMImplementation impl = resultDoc.getImplementation();
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Node root = resultDoc.getDocumentElement();
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if (root != null)
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{
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DocumentType doctype =
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impl.createDocumentType(root.getNodeName(),
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publicId,
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systemId);
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resultDoc.insertBefore(doctype, root);
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}
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}
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}
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if (version != null)
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parent.setUserData("version", version, stylesheet);
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if (omitXmlDeclaration)
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parent.setUserData("omit-xml-declaration", "yes", stylesheet);
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if (standalone)
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parent.setUserData("standalone", "yes", stylesheet);
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if (mediaType != null)
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parent.setUserData("media-type", mediaType, stylesheet);
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if (cdataSectionElements != null)
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{
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List list = new LinkedList();
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StringTokenizer st = new StringTokenizer(cdataSectionElements);
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while (st.hasMoreTokens())
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{
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String name = st.nextToken();
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String localName = name;
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String uri = null;
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String prefix = null;
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int ci = name.indexOf(':');
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if (ci != -1)
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{
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// Use namespaces defined on xsl:output node to resolve
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// namespaces for QName
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prefix = name.substring(0, ci);
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localName = name.substring(ci + 1);
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uri = stylesheet.output.lookupNamespaceURI(prefix);
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}
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list.add(new QName(uri, localName, prefix));
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}
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if (!list.isEmpty())
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{
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Document resultDoc = (parent instanceof Document) ?
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(Document) parent :
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parent.getOwnerDocument();
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convertCdataSectionElements(resultDoc, parent, list);
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}
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}
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if (indent)
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{
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if (created && parent instanceof DomDocument)
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{
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DomDocument domDoc = (DomDocument) parent;
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domDoc.setBuilding(true);
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domDoc.setCheckWellformedness(false);
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}
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parent.normalize();
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if (stylesheet != null)
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strip(stylesheet, parent);
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Document resultDoc = (parent instanceof Document) ?
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(Document) parent :
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parent.getOwnerDocument();
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reindent(resultDoc, parent, 0);
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if (created && parent instanceof DomDocument)
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{
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DomDocument domDoc = (DomDocument) parent;
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domDoc.setBuilding(false);
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domDoc.setCheckWellformedness(true);
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}
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}
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// Render result to the target device
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if (outputTarget instanceof DOMResult)
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{
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if (created)
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{
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DOMResult dr = (DOMResult) outputTarget;
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dr.setNode(parent);
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dr.setNextSibling(null);
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}
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}
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else if (outputTarget instanceof StreamResult)
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{
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StreamResult sr = (StreamResult) outputTarget;
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IOException ex = null;
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try
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{
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writeStreamResult(parent, sr, outputMethod, encoding);
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}
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catch (UnsupportedEncodingException e)
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{
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try
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{
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writeStreamResult(parent, sr, outputMethod, "UTF-8");
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}
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catch (IOException e2)
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{
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ex = e2;
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}
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}
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catch (IOException e)
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{
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ex = e;
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}
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if (ex != null)
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{
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if (errorListener != null)
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errorListener.error(new TransformerException(ex));
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else
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ex.printStackTrace(System.err);
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}
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}
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else if (outputTarget instanceof SAXResult)
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{
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SAXResult sr = (SAXResult) outputTarget;
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try
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{
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ContentHandler ch = sr.getHandler();
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LexicalHandler lh = sr.getLexicalHandler();
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if (lh == null && ch instanceof LexicalHandler)
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lh = (LexicalHandler) ch;
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SAXSerializer serializer = new SAXSerializer();
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serializer.serialize(parent, ch, lh);
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}
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catch (SAXException e)
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{
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if (errorListener != null)
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errorListener.error(new TransformerException(e));
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else
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e.printStackTrace(System.err);
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}
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}
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}
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/**
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* Strip whitespace from the source tree.
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*/
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static boolean strip(Stylesheet stylesheet, Node node)
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throws TransformerConfigurationException
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{
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short nt = node.getNodeType();
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if (nt == Node.ENTITY_REFERENCE_NODE)
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{
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// Replace entity reference with its content
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Node parent = node.getParentNode();
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Node nextSibling = node.getNextSibling();
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Node child = node.getFirstChild();
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while (child != null)
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{
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Node next = child.getNextSibling();
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node.removeChild(child);
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if (nextSibling != null)
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parent.insertBefore(child, nextSibling);
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else
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parent.appendChild(child);
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child = next;
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}
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return true;
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}
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if (nt == Node.TEXT_NODE || nt == Node.CDATA_SECTION_NODE)
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{
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// Denormalize text into whitespace and non-whitespace nodes
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String text = node.getNodeValue();
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String[] tokens = tokenizeWhitespace(text);
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if (tokens.length > 1)
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{
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node.setNodeValue(tokens[0]);
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Node parent = node.getParentNode();
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Node nextSibling = node.getNextSibling();
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Document doc = node.getOwnerDocument();
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for (int i = 1; i < tokens.length; i++)
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{
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Node newChild = (nt == Node.CDATA_SECTION_NODE) ?
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doc.createCDATASection(tokens[i]) :
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doc.createTextNode(tokens[i]);
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if (nextSibling != null)
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parent.insertBefore(newChild, nextSibling);
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else
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parent.appendChild(newChild);
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}
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}
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return !stylesheet.isPreserved((Text) node, true);
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}
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else
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{
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Node child = node.getFirstChild();
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while (child != null)
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{
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boolean remove = strip(stylesheet, child);
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Node next = child.getNextSibling();
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if (remove)
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node.removeChild(child);
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child = next;
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}
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}
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return false;
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}
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/**
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* Tokenize the specified text into contiguous whitespace-only and
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* non-whitespace chunks.
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*/
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private static String[] tokenizeWhitespace(String text)
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{
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int len = text.length();
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int start = 0, end = len - 1;
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// Find index of text start
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for (int i = 0; i < len; i++)
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{
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char c = text.charAt(i);
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boolean whitespace = (c == ' ' || c == '\n' || c == '\t' || c == '\r');
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if (whitespace)
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start++;
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else
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break;
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}
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if (start == end) // all whitespace
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return new String[] { text };
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// Find index of text end
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for (int i = end; i > start; i--)
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{
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char c = text.charAt(i);
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boolean whitespace = (c == ' ' || c == '\n' || c == '\t' || c == '\r');
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if (whitespace)
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end--;
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else
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break;
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}
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if (start == 0 && end == len - 1) // all non-whitespace
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return new String[] { text };
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// whitespace, then text, then whitespace
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String[] ret = (start > 0 && end < len - 1) ?
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new String[3] : new String[2];
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int i = 0;
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if (start > 0)
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ret[i++] = text.substring(0, start);
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ret[i++] = text.substring(start, end + 1);
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if (end < len - 1)
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ret[i++] = text.substring(end + 1);
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return ret;
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}
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/**
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* Obtain a suitable output stream for writing the result to,
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* and use the StreamSerializer to write the result tree to the stream.
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*/
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void writeStreamResult(Node node, StreamResult sr, int outputMethod,
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String encoding)
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throws IOException
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{
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OutputStream out = null;
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boolean created = false;
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try
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{
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out = sr.getOutputStream();
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if (out == null)
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{
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Writer writer = sr.getWriter();
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if (writer != null)
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out = new WriterOutputStream(writer);
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}
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if (out == null)
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{
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String systemId = sr.getSystemId();
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try
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{
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URL url = new URL(systemId);
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URLConnection connection = url.openConnection();
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// We need to call setDoInput(false), because our
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// implementation of the file protocol allows writing
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// (unlike Sun), but it will fail with a FileNotFoundException
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// if we also open the connection for input and the output
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// file doesn't yet exist.
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connection.setDoInput(false);
|
|
connection.setDoOutput(true);
|
|
out = connection.getOutputStream();
|
|
}
|
|
catch (MalformedURLException e)
|
|
{
|
|
out = new FileOutputStream(systemId);
|
|
}
|
|
catch (UnknownServiceException e)
|
|
{
|
|
URL url = new URL(systemId);
|
|
out = new FileOutputStream(url.getPath());
|
|
}
|
|
created = true;
|
|
}
|
|
out = new BufferedOutputStream(out);
|
|
StreamSerializer serializer =
|
|
new StreamSerializer(outputMethod, encoding, null);
|
|
if (stylesheet != null)
|
|
{
|
|
Collection celem = stylesheet.outputCdataSectionElements;
|
|
serializer.setCdataSectionElements(celem);
|
|
}
|
|
serializer.serialize(node, out);
|
|
out.flush();
|
|
}
|
|
finally
|
|
{
|
|
try
|
|
{
|
|
if (out != null && created)
|
|
out.close();
|
|
}
|
|
catch (IOException e)
|
|
{
|
|
if (errorListener != null)
|
|
{
|
|
try
|
|
{
|
|
errorListener.error(new TransformerException(e));
|
|
}
|
|
catch (TransformerException e2)
|
|
{
|
|
e2.printStackTrace(System.err);
|
|
}
|
|
}
|
|
else
|
|
e.printStackTrace(System.err);
|
|
}
|
|
}
|
|
}
|
|
|
|
void copyChildren(Document dstDoc, Node src, Node dst)
|
|
{
|
|
Node srcChild = src.getFirstChild();
|
|
while (srcChild != null)
|
|
{
|
|
Node dstChild = dstDoc.adoptNode(srcChild);
|
|
dst.appendChild(dstChild);
|
|
srcChild = srcChild.getNextSibling();
|
|
}
|
|
}
|
|
|
|
public void setParameter(String name, Object value)
|
|
{
|
|
if (stylesheet != null)
|
|
stylesheet.bindings.set(new QName(null, name), value, Bindings.PARAM);
|
|
}
|
|
|
|
public Object getParameter(String name)
|
|
{
|
|
if (stylesheet != null)
|
|
return stylesheet.bindings.get(new QName(null, name), null, 1, 1);
|
|
return null;
|
|
}
|
|
|
|
public void clearParameters()
|
|
{
|
|
if (stylesheet != null)
|
|
{
|
|
stylesheet.bindings.pop(Bindings.PARAM);
|
|
stylesheet.bindings.push(Bindings.PARAM);
|
|
}
|
|
}
|
|
|
|
public void setURIResolver(URIResolver resolver)
|
|
{
|
|
uriResolver = resolver;
|
|
}
|
|
|
|
public URIResolver getURIResolver()
|
|
{
|
|
return uriResolver;
|
|
}
|
|
|
|
public void setOutputProperties(Properties oformat)
|
|
throws IllegalArgumentException
|
|
{
|
|
if (oformat == null)
|
|
outputProperties.clear();
|
|
else
|
|
outputProperties.putAll(oformat);
|
|
}
|
|
|
|
public Properties getOutputProperties()
|
|
{
|
|
return (Properties) outputProperties.clone();
|
|
}
|
|
|
|
public void setOutputProperty(String name, String value)
|
|
throws IllegalArgumentException
|
|
{
|
|
outputProperties.put(name, value);
|
|
}
|
|
|
|
public String getOutputProperty(String name)
|
|
throws IllegalArgumentException
|
|
{
|
|
return outputProperties.getProperty(name);
|
|
}
|
|
|
|
public void setErrorListener(ErrorListener listener)
|
|
{
|
|
errorListener = listener;
|
|
}
|
|
|
|
public ErrorListener getErrorListener()
|
|
{
|
|
return errorListener;
|
|
}
|
|
|
|
static final String INDENT_WHITESPACE = " ";
|
|
|
|
/*
|
|
* Apply indent formatting to the given tree.
|
|
*/
|
|
void reindent(Document doc, Node node, int offset)
|
|
{
|
|
if (node.hasChildNodes())
|
|
{
|
|
boolean markupContent = false;
|
|
boolean textContent = false;
|
|
List children = new LinkedList();
|
|
Node ctx = node.getFirstChild();
|
|
while (ctx != null)
|
|
{
|
|
switch (ctx.getNodeType())
|
|
{
|
|
case Node.ELEMENT_NODE:
|
|
case Node.PROCESSING_INSTRUCTION_NODE:
|
|
case Node.DOCUMENT_TYPE_NODE:
|
|
markupContent = true;
|
|
break;
|
|
case Node.TEXT_NODE:
|
|
case Node.CDATA_SECTION_NODE:
|
|
case Node.ENTITY_REFERENCE_NODE:
|
|
case Node.COMMENT_NODE:
|
|
textContent = true;
|
|
break;
|
|
}
|
|
children.add(ctx);
|
|
ctx = ctx.getNextSibling();
|
|
}
|
|
if (markupContent)
|
|
{
|
|
if (textContent)
|
|
{
|
|
// XXX handle mixed content differently?
|
|
}
|
|
int nodeType = node.getNodeType();
|
|
if (nodeType == Node.DOCUMENT_NODE)
|
|
{
|
|
for (Iterator i = children.iterator(); i.hasNext(); )
|
|
{
|
|
ctx = (Node) i.next();
|
|
reindent(doc, ctx, offset);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
CPStringBuilder buf = new CPStringBuilder();
|
|
buf.append('\n');
|
|
for (int i = 0; i < offset + 1; i++)
|
|
buf.append(INDENT_WHITESPACE);
|
|
String ws = buf.toString();
|
|
for (Iterator i = children.iterator(); i.hasNext(); )
|
|
{
|
|
ctx = (Node) i.next();
|
|
node.insertBefore(doc.createTextNode(ws), ctx);
|
|
reindent(doc, ctx, offset + 1);
|
|
}
|
|
buf = new CPStringBuilder();
|
|
buf.append('\n');
|
|
for (int i = 0; i < offset; i++)
|
|
buf.append(INDENT_WHITESPACE);
|
|
ws = buf.toString();
|
|
node.appendChild(doc.createTextNode(ws));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Converts the text node children of any cdata-section-elements in the
|
|
* tree to CDATA section nodes.
|
|
*/
|
|
void convertCdataSectionElements(Document doc, Node node, List list)
|
|
{
|
|
if (node.getNodeType() == Node.ELEMENT_NODE)
|
|
{
|
|
boolean match = false;
|
|
for (Iterator i = list.iterator(); i.hasNext(); )
|
|
{
|
|
QName qname = (QName) i.next();
|
|
if (match(qname, node))
|
|
{
|
|
match = true;
|
|
break;
|
|
}
|
|
}
|
|
if (match)
|
|
{
|
|
Node ctx = node.getFirstChild();
|
|
while (ctx != null)
|
|
{
|
|
if (ctx.getNodeType() == Node.TEXT_NODE)
|
|
{
|
|
Node cdata = doc.createCDATASection(ctx.getNodeValue());
|
|
node.replaceChild(cdata, ctx);
|
|
ctx = cdata;
|
|
}
|
|
ctx = ctx.getNextSibling();
|
|
}
|
|
}
|
|
}
|
|
Node ctx = node.getFirstChild();
|
|
while (ctx != null)
|
|
{
|
|
if (ctx.hasChildNodes())
|
|
convertCdataSectionElements(doc, ctx, list);
|
|
ctx = ctx.getNextSibling();
|
|
}
|
|
}
|
|
|
|
boolean match(QName qname, Node node)
|
|
{
|
|
String ln1 = qname.getLocalPart();
|
|
String ln2 = node.getLocalName();
|
|
if (ln2 == null)
|
|
return ln1.equals(node.getNodeName());
|
|
else
|
|
{
|
|
String uri1 = qname.getNamespaceURI();
|
|
String uri2 = node.getNamespaceURI();
|
|
return (uri1.equals(uri2) && ln1.equals(ln2));
|
|
}
|
|
}
|
|
|
|
}
|