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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.
*/
package sample;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringReader;
import java.io.StringWriter;
import org.apache.xerces.xni.Augmentations;
import org.apache.xerces.xni.QName;
import org.apache.xerces.xni.XMLAttributes;
import org.apache.xerces.xni.XMLLocator;
import org.apache.xerces.xni.XMLString;
import org.apache.xerces.xni.XNIException;
import org.apache.xerces.xni.parser.XMLDocumentFilter;
import org.apache.xerces.xni.parser.XMLInputSource;
import org.cyberneko.html.HTMLConfiguration;
import org.cyberneko.html.filters.DefaultFilter;
import org.cyberneko.html.filters.Identity;
import org.cyberneko.html.filters.Writer;
/**
* This sample demonstrates how to use of the pushInputSource
* method of the HTMLConfiguration in order to dynamically insert content
* into the HTML stream. The typical use for this functionality is to
* insert the result of an embedded script into the HTML document in place
* of the script.
*
* This particular example defines a new script language called "NekoHTML"
* script that is a tiny subset of the NSGMLS format. The following table
* enumerates the NSGMLS features supported by this script language:
*
* (name A start element with the specified name.
* "text Character content with the specified text.
* )name An end element with the specified name.
*
*
* In this format, every command is specified on a line by itself.
* For example, the following document:
*
* <script type='NekoHTML'>
* (h1
* "Header
* )h1
* </script>
*
* is equivalent to the following HTML document:
*
* <H1>Header</H1>
*
* as seen by document handler registered with the parser, when processed
* by this filter.
*
* @author Andy Clark
*
* @version $Id: Script.java,v 1.3 2004/02/19 20:00:17 andyc Exp $
*/
public class Script
extends DefaultFilter {
//
// Constants
//
/** Augmentations feature identifier. */
protected static final String AUGMENTATIONS = "http://cyberneko.org/html/features/augmentations";
/** Filters property identifier. */
protected static final String FILTERS = "http://cyberneko.org/html/properties/filters";
/** Script type ("text/x-nekoscript"). */
protected static final String SCRIPT_TYPE = "text/x-nekoscript";
//
// Data
//
/** The NekoHTML configuration. */
protected HTMLConfiguration fConfiguration;
/** A string buffer to collect the "script". */
protected StringBuffer fBuffer;
/** The system identifier of the source document. */
protected String fSystemId;
/** The script count. */
protected int fScriptCount;
//
// Constructors
//
/** Constructs a script object with the specified configuration. */
public Script(HTMLConfiguration config) {
fConfiguration = config;
} // (HTMLConfiguration)
//
// XMLDocumentHandler methods
//
/** Start document. */
public void startDocument(XMLLocator locator, String encoding, Augmentations augs)
throws XNIException {
fBuffer = null;
fSystemId = locator != null ? locator.getLiteralSystemId() : null;
fScriptCount = 0;
super.startDocument(locator, encoding, augs);
} // startDocument(XMLLocator,String,Augmentations)
/** Start element. */
public void startElement(QName element, XMLAttributes attrs, Augmentations augs)
throws XNIException {
if (element.rawname.equalsIgnoreCase("script") && attrs != null) {
String value = attrs.getValue("type");
if (value != null && value.equalsIgnoreCase(SCRIPT_TYPE)) {
fBuffer = new StringBuffer();
return;
}
}
super.startElement(element, attrs, augs);
} // startElement(QName,XMLAttributes,Augmentations)
/** Empty element. */
public void emptyElement(QName element, XMLAttributes attrs, Augmentations augs)
throws XNIException {
if (element.rawname.equalsIgnoreCase("script") && attrs != null) {
String value = attrs.getValue("type");
if (value != null && value.equalsIgnoreCase(SCRIPT_TYPE)) {
return;
}
}
super.emptyElement(element, attrs, augs);
} // emptyElement(QName,XMLAttributes,Augmentations)
/** Characters. */
public void characters(XMLString text, Augmentations augs)
throws XNIException {
if (fBuffer != null) {
fBuffer.append(text.ch, text.offset, text.length);
}
else {
super.characters(text, augs);
}
} // characters(XMLString,Augmentations)
/** End element. */
public void endElement(QName element, Augmentations augs) throws XNIException {
if (fBuffer != null) {
try {
// run "script" and generate HTML output
BufferedReader in = new BufferedReader(new StringReader(fBuffer.toString()));
StringWriter sout = new StringWriter();
PrintWriter out = new PrintWriter(sout);
String line;
while ((line = in.readLine()) != null) {
line.trim();
if (line.length() == 0) {
continue;
}
switch (line.charAt(0)) {
case '(': {
out.print('<');
out.print(line.substring(1));
out.print('>');
break;
}
case '"': {
out.print(line.substring(1));
break;
}
case ')': {
out.print("');
break;
}
}
}
// push new input source
String systemId = fSystemId != null ? fSystemId+'_' : "";
fScriptCount++;
systemId += "script"+fScriptCount;
XMLInputSource source = new XMLInputSource(null, systemId, null,
new StringReader(sout.toString()),
"UTF-8");
fConfiguration.pushInputSource(source);
}
catch (IOException e) {
// ignore
}
finally {
fBuffer = null;
}
}
else {
super.endElement(element, augs);
}
} // endElement(QName,Augmentations)
//
// MAIN
//
/** Main. */
public static void main(String[] argv) throws Exception {
HTMLConfiguration parser = new HTMLConfiguration();
parser.setFeature(AUGMENTATIONS, true);
XMLDocumentFilter[] filters = { new Script(parser), new Identity(), new Writer() };
parser.setProperty(FILTERS, filters);
for (int i = 0; i < argv.length; i++) {
parser.parse(new XMLInputSource(null, argv[i], null));
}
} // main(String[])
} // class Script
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