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An HTML parser and tag balancer.
/*
* Copyright 2002-2009 Andy Clark, Marc Guillemot
*
* 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.
* ==============================================================
* This file contains some code from Apache Xerces-J which is
* used in accordance with the Apache license.
*/
package org.cyberneko.html.parsers;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import org.apache.xerces.impl.Constants;
import org.apache.xerces.util.ErrorHandlerWrapper;
import org.apache.xerces.util.XMLChar;
import org.apache.xerces.xni.Augmentations;
import org.apache.xerces.xni.NamespaceContext;
import org.apache.xerces.xni.QName;
import org.apache.xerces.xni.XMLAttributes;
import org.apache.xerces.xni.XMLDocumentHandler;
import org.apache.xerces.xni.XMLLocator;
import org.apache.xerces.xni.XMLResourceIdentifier;
import org.apache.xerces.xni.XMLString;
import org.apache.xerces.xni.XNIException;
import org.apache.xerces.xni.parser.XMLConfigurationException;
import org.apache.xerces.xni.parser.XMLDocumentSource;
import org.apache.xerces.xni.parser.XMLErrorHandler;
import org.apache.xerces.xni.parser.XMLInputSource;
import org.apache.xerces.xni.parser.XMLParseException;
import org.apache.xerces.xni.parser.XMLParserConfiguration;
import org.cyberneko.html.HTMLConfiguration;
import org.w3c.dom.CDATASection;
import org.w3c.dom.Comment;
import org.w3c.dom.Document;
import org.w3c.dom.DocumentFragment;
import org.w3c.dom.Element;
import org.w3c.dom.EntityReference;
import org.w3c.dom.Node;
import org.w3c.dom.ProcessingInstruction;
import org.w3c.dom.Text;
import org.xml.sax.ErrorHandler;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.SAXNotRecognizedException;
import org.xml.sax.SAXNotSupportedException;
import org.xml.sax.SAXParseException;
/**
* A DOM parser for HTML fragments.
*
* @author Andy Clark
*
* @version $Id: DOMFragmentParser.java,v 1.8 2005/02/14 03:56:54 andyc Exp $
*/
public class DOMFragmentParser
implements XMLDocumentHandler {
//
// Constants
//
// features
/** Document fragment balancing only. */
protected static final String DOCUMENT_FRAGMENT =
"http://cyberneko.org/html/features/document-fragment";
/** Recognized features. */
protected static final String[] RECOGNIZED_FEATURES = {
DOCUMENT_FRAGMENT,
};
// properties
/** Property identifier: error handler. */
protected static final String ERROR_HANDLER =
Constants.XERCES_PROPERTY_PREFIX + Constants.ERROR_HANDLER_PROPERTY;
/** Current element node. */
protected static final String CURRENT_ELEMENT_NODE =
Constants.XERCES_PROPERTY_PREFIX + Constants.CURRENT_ELEMENT_NODE_PROPERTY;
/** Recognized properties. */
protected static final String[] RECOGNIZED_PROPERTIES = {
ERROR_HANDLER,
CURRENT_ELEMENT_NODE,
};
//
// Data
//
/** Parser configuration. */
protected XMLParserConfiguration fParserConfiguration;
/** Document source. */
protected XMLDocumentSource fDocumentSource;
/** DOM document fragment. */
protected DocumentFragment fDocumentFragment;
/** Document. */
protected Document fDocument;
/** Current node. */
protected Node fCurrentNode;
/** True if within a CDATA section. */
protected boolean fInCDATASection;
//
// Constructors
//
/** Default constructor. */
public DOMFragmentParser() {
fParserConfiguration = new HTMLConfiguration();
fParserConfiguration.addRecognizedFeatures(RECOGNIZED_FEATURES);
fParserConfiguration.addRecognizedProperties(RECOGNIZED_PROPERTIES);
fParserConfiguration.setFeature(DOCUMENT_FRAGMENT, true);
fParserConfiguration.setDocumentHandler(this);
} // ()
//
// Public methods
//
/** Parses a document fragment. */
public void parse(String systemId, DocumentFragment fragment)
throws SAXException, IOException {
parse(new InputSource(systemId), fragment);
} // parse(String,DocumentFragment)
/** Parses a document fragment. */
public void parse(InputSource source, DocumentFragment fragment)
throws SAXException, IOException {
fCurrentNode = fDocumentFragment = fragment;
fDocument = fDocumentFragment.getOwnerDocument();
try {
String pubid = source.getPublicId();
String sysid = source.getSystemId();
String encoding = source.getEncoding();
InputStream stream = source.getByteStream();
Reader reader = source.getCharacterStream();
XMLInputSource inputSource =
new XMLInputSource(pubid, sysid, sysid);
inputSource.setEncoding(encoding);
inputSource.setByteStream(stream);
inputSource.setCharacterStream(reader);
fParserConfiguration.parse(inputSource);
}
catch (XMLParseException e) {
Exception ex = e.getException();
if (ex != null) {
throw new SAXParseException(e.getMessage(), null, ex);
}
throw new SAXParseException(e.getMessage(), null);
}
} // parse(InputSource,DocumentFragment)
/**
* Allow an application to register an error event handler.
*
* If the application does not register an error handler, all
* error events reported by the SAX parser will be silently
* ignored; however, normal processing may not continue. It is
* highly recommended that all SAX applications implement an
* error handler to avoid unexpected bugs.
*
* Applications may register a new or different handler in the
* middle of a parse, and the SAX parser must begin using the new
* handler immediately.
*
* @param errorHandler The error handler.
* @exception java.lang.NullPointerException If the handler
* argument is null.
* @see #getErrorHandler
*/
public void setErrorHandler(ErrorHandler errorHandler) {
fParserConfiguration.setErrorHandler(new ErrorHandlerWrapper(errorHandler));
} // setErrorHandler(ErrorHandler)
/**
* Return the current error handler.
*
* @return The current error handler, or null if none
* has been registered.
* @see #setErrorHandler
*/
public ErrorHandler getErrorHandler() {
ErrorHandler errorHandler = null;
try {
XMLErrorHandler xmlErrorHandler =
(XMLErrorHandler)fParserConfiguration.getProperty(ERROR_HANDLER);
if (xmlErrorHandler != null &&
xmlErrorHandler instanceof ErrorHandlerWrapper) {
errorHandler = ((ErrorHandlerWrapper)xmlErrorHandler).getErrorHandler();
}
}
catch (XMLConfigurationException e) {
// do nothing
}
return errorHandler;
} // getErrorHandler():ErrorHandler
/**
* Set the state of any feature in a SAX2 parser. The parser
* might not recognize the feature, and if it does recognize
* it, it might not be able to fulfill the request.
*
* @param featureId The unique identifier (URI) of the feature.
* @param state The requested state of the feature (true or false).
*
* @exception SAXNotRecognizedException If the
* requested feature is not known.
* @exception SAXNotSupportedException If the
* requested feature is known, but the requested
* state is not supported.
*/
public void setFeature(String featureId, boolean state)
throws SAXNotRecognizedException, SAXNotSupportedException {
try {
fParserConfiguration.setFeature(featureId, state);
}
catch (XMLConfigurationException e) {
String message = e.getMessage();
if (e.getType() == XMLConfigurationException.NOT_RECOGNIZED) {
throw new SAXNotRecognizedException(message);
}
throw new SAXNotSupportedException(message);
}
} // setFeature(String,boolean)
/**
* Query the state of a feature.
*
* Query the current state of any feature in a SAX2 parser. The
* parser might not recognize the feature.
*
* @param featureId The unique identifier (URI) of the feature
* being set.
* @return The current state of the feature.
* @exception org.xml.sax.SAXNotRecognizedException If the
* requested feature is not known.
* @exception SAXNotSupportedException If the
* requested feature is known but not supported.
*/
public boolean getFeature(String featureId)
throws SAXNotRecognizedException, SAXNotSupportedException {
try {
return fParserConfiguration.getFeature(featureId);
}
catch (XMLConfigurationException e) {
String message = e.getMessage();
if (e.getType() == XMLConfigurationException.NOT_RECOGNIZED) {
throw new SAXNotRecognizedException(message);
}
throw new SAXNotSupportedException(message);
}
} // getFeature(String):boolean
/**
* Set the value of any property in a SAX2 parser. The parser
* might not recognize the property, and if it does recognize
* it, it might not support the requested value.
*
* @param propertyId The unique identifier (URI) of the property
* being set.
* @param value The value to which the property is being set.
*
* @exception SAXNotRecognizedException If the
* requested property is not known.
* @exception SAXNotSupportedException If the
* requested property is known, but the requested
* value is not supported.
*/
public void setProperty(String propertyId, Object value)
throws SAXNotRecognizedException, SAXNotSupportedException {
try {
fParserConfiguration.setProperty(propertyId, value);
}
catch (XMLConfigurationException e) {
String message = e.getMessage();
if (e.getType() == XMLConfigurationException.NOT_RECOGNIZED) {
throw new SAXNotRecognizedException(message);
}
throw new SAXNotSupportedException(message);
}
} // setProperty(String,Object)
/**
* Query the value of a property.
*
* Return the current value of a property in a SAX2 parser.
* The parser might not recognize the property.
*
* @param propertyId The unique identifier (URI) of the property
* being set.
* @return The current value of the property.
* @exception org.xml.sax.SAXNotRecognizedException If the
* requested property is not known.
* @exception SAXNotSupportedException If the
* requested property is known but not supported.
*/
public Object getProperty(String propertyId)
throws SAXNotRecognizedException, SAXNotSupportedException {
if (propertyId.equals(CURRENT_ELEMENT_NODE)) {
return (fCurrentNode!=null &&
fCurrentNode.getNodeType() == Node.ELEMENT_NODE)? fCurrentNode:null;
}
try {
return fParserConfiguration.getProperty(propertyId);
}
catch (XMLConfigurationException e) {
String message = e.getMessage();
if (e.getType() == XMLConfigurationException.NOT_RECOGNIZED) {
throw new SAXNotRecognizedException(message);
}
throw new SAXNotSupportedException(message);
}
} // getProperty(String):Object
//
// XMLDocumentHandler methods
//
/** Sets the document source. */
public void setDocumentSource(XMLDocumentSource source) {
fDocumentSource = source;
} // setDocumentSource(XMLDocumentSource)
/** Returns the document source. */
public XMLDocumentSource getDocumentSource() {
return fDocumentSource;
} // getDocumentSource():XMLDocumentSource
/** Start document. */
public void startDocument(XMLLocator locator, String encoding,
Augmentations augs) throws XNIException {
startDocument(locator, encoding, null, augs);
} // startDocument(XMLLocator,String,Augmentations)
// since Xerces 2.2.0
/** Start document. */
public void startDocument(XMLLocator locator, String encoding,
NamespaceContext nscontext,
Augmentations augs) throws XNIException {
fInCDATASection = false;
} // startDocument(XMLLocator,String,NamespaceContext,Augmentations)
/** XML declaration. */
public void xmlDecl(String version, String encoding,
String standalone, Augmentations augs)
throws XNIException {
} // xmlDecl(String,String,String,Augmentations)
/** Document type declaration. */
public void doctypeDecl(String root, String pubid, String sysid,
Augmentations augs) throws XNIException {
} // doctypeDecl(String,String,String,Augmentations)
/** Processing instruction. */
public void processingInstruction(final String target, final XMLString data,
final Augmentations augs)
throws XNIException {
final String s = data.toString();
if (XMLChar.isValidName(s)) {
final ProcessingInstruction pi = fDocument.createProcessingInstruction(target, s);
fCurrentNode.appendChild(pi);
}
} // processingInstruction(String,XMLString,Augmentations)
/** Comment. */
public void comment(XMLString text, Augmentations augs)
throws XNIException {
Comment comment = fDocument.createComment(text.toString());
fCurrentNode.appendChild(comment);
} // comment(XMLString,Augmentations)
/** Start prefix mapping. @deprecated Since Xerces 2.2.0. */
public void startPrefixMapping(String prefix, String uri,
Augmentations augs) throws XNIException {
} // startPrefixMapping(String,String,Augmentations)
/** End prefix mapping. @deprecated Since Xerces 2.2.0. */
public void endPrefixMapping(String prefix, Augmentations augs)
throws XNIException {
} // endPrefixMapping(String,Augmentations)
/** Start element. */
public void startElement(QName element, XMLAttributes attrs,
Augmentations augs) throws XNIException {
Element elementNode = fDocument.createElement(element.rawname);
int count = attrs != null ? attrs.getLength() : 0;
for (int i = 0; i < count; i++) {
String aname = attrs.getQName(i);
String avalue = attrs.getValue(i);
if (XMLChar.isValidName(aname)) {
elementNode.setAttribute(aname, avalue);
}
}
fCurrentNode.appendChild(elementNode);
fCurrentNode = elementNode;
} // startElement(QName,XMLAttributes,Augmentations)
/** Empty element. */
public void emptyElement(QName element, XMLAttributes attrs,
Augmentations augs) throws XNIException {
startElement(element, attrs, augs);
endElement(element, augs);
} // emptyElement(QName,XMLAttributes,Augmentations)
/** Characters. */
public void characters(XMLString text, Augmentations augs)
throws XNIException {
if (fInCDATASection) {
Node node = fCurrentNode.getLastChild();
if (node != null && node.getNodeType() == Node.CDATA_SECTION_NODE) {
CDATASection cdata = (CDATASection)node;
cdata.appendData(text.toString());
}
else {
CDATASection cdata = fDocument.createCDATASection(text.toString());
fCurrentNode.appendChild(cdata);
}
}
else {
Node node = fCurrentNode.getLastChild();
if (node != null && node.getNodeType() == Node.TEXT_NODE) {
Text textNode = (Text)node;
textNode.appendData(text.toString());
}
else {
Text textNode = fDocument.createTextNode(text.toString());
fCurrentNode.appendChild(textNode);
}
}
} // characters(XMLString,Augmentations)
/** Ignorable whitespace. */
public void ignorableWhitespace(XMLString text, Augmentations augs)
throws XNIException {
characters(text, augs);
} // ignorableWhitespace(XMLString,Augmentations)
/** Start general entity. */
public void startGeneralEntity(String name, XMLResourceIdentifier id,
String encoding, Augmentations augs)
throws XNIException {
EntityReference entityRef = fDocument.createEntityReference(name);
fCurrentNode.appendChild(entityRef);
fCurrentNode = entityRef;
} // startGeneralEntity(String,XMLResourceIdentifier,String,Augmentations)
/** Text declaration. */
public void textDecl(String version, String encoding,
Augmentations augs) throws XNIException {
} // textDecl(String,String,Augmentations)
/** End general entity. */
public void endGeneralEntity(String name, Augmentations augs)
throws XNIException {
fCurrentNode = fCurrentNode.getParentNode();
} // endGeneralEntity(String,Augmentations)
/** Start CDATA section. */
public void startCDATA(Augmentations augs) throws XNIException {
fInCDATASection = true;
} // startCDATA(Augmentations)
/** End CDATA section. */
public void endCDATA(Augmentations augs) throws XNIException {
fInCDATASection = false;
} // endCDATA(Augmentations)
/** End element. */
public void endElement(QName element, Augmentations augs)
throws XNIException {
fCurrentNode = fCurrentNode.getParentNode();
} // endElement(QName,Augmentations)
/** End document. */
public void endDocument(Augmentations augs) throws XNIException {
} // endDocument(Augmentations)
//
// DEBUG
//
/***
public static void print(Node node) {
short type = node.getNodeType();
switch (type) {
case Node.ELEMENT_NODE: {
System.out.print('<');
System.out.print(node.getNodeName());
org.w3c.dom.NamedNodeMap attrs = node.getAttributes();
int attrCount = attrs != null ? attrs.getLength() : 0;
for (int i = 0; i < attrCount; i++) {
Node attr = attrs.item(i);
System.out.print(' ');
System.out.print(attr.getNodeName());
System.out.print("='");
System.out.print(attr.getNodeValue());
System.out.print('\'');
}
System.out.print('>');
break;
}
case Node.TEXT_NODE: {
System.out.print(node.getNodeValue());
break;
}
}
Node child = node.getFirstChild();
while (child != null) {
print(child);
child = child.getNextSibling();
}
if (type == Node.ELEMENT_NODE) {
System.out.print("');
}
else if (type == Node.DOCUMENT_NODE || type == Node.DOCUMENT_FRAGMENT_NODE) {
System.out.println();
}
System.out.flush();
}
public static void main(String[] argv) throws Exception {
DOMFragmentParser parser = new DOMFragmentParser();
HTMLDocument document = new org.apache.html.dom.HTMLDocumentImpl();
for (int i = 0; i < argv.length; i++) {
String sysid = argv[i];
System.err.println("# "+sysid);
DocumentFragment fragment = document.createDocumentFragment();
parser.parse(sysid, fragment);
print(fragment);
}
}
/***/
} // class DOMFragmentParser
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