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Tom Tromey
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libjava/classpath/gnu/xml/util/DoParse.java
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libjava/classpath/gnu/xml/util/DoParse.java
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/* DoParse.java --
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Copyright (C) 1999,2000,2001 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.util;
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import java.io.IOException;
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import org.xml.sax.ErrorHandler;
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import org.xml.sax.InputSource;
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import org.xml.sax.SAXException;
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import org.xml.sax.SAXParseException;
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import org.xml.sax.XMLReader;
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import org.xml.sax.helpers.XMLReaderFactory;
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import gnu.xml.pipeline.EventConsumer;
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import gnu.xml.pipeline.EventFilter;
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import gnu.xml.pipeline.NSFilter;
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import gnu.xml.pipeline.PipelineFactory;
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import gnu.xml.pipeline.TeeConsumer;
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import gnu.xml.pipeline.ValidationConsumer;
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import gnu.xml.pipeline.WellFormednessFilter;
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/**
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* This class provides a driver which may be invoked from the command line
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* to process a document using a SAX2 parser and a specified XML processing
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* pipeline.
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* This facilitates some common types of command line tools, such as parsing an
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* XML document in order test it for well formedness or validity.
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*
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* <p>The SAX2 XMLReaderFactory should return a SAX2 XML parser which
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* supports both of the standardized extension handlers (for declaration
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* and lexical events). That parser will be used to produce events.
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*
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* <p>The first parameter to the command gives the name of the document that
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* will be given to that processor. If it is a file name, it is converted
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* to a URL first.
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*
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* <p>The second parameter describes a simple processing pipeline, and will
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* be used as input to {@link gnu.xml.pipeline.PipelineFactory}
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* methods which identify the processing to be done. Examples of such a
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* pipeline include <pre>
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*
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* nsfix | validate <em>to validate the input document </em>
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* nsfix | write ( stdout ) <em>to echo the file as XML text</em>
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* dom | nsfix | write ( stdout ) <em>parse into DOM, print the result</em>
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* </pre>
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*
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* <p> Relatively complex pipelines can be described on the command line, but
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* not all interesting ones will require as little configuration as can be done
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* in that way. Put filters like "nsfix", perhaps followed by "validate",
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* at the front of the pipeline so they can be optimized out if a parser
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* supports those modes natively.
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*
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* <p> If the parsing is aborted for any reason, the JVM will exit with a
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* failure code. If a validating parse was done then both validation and
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* well formedness errors will cause a failure. A non-validating parse
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* will report failure on well formedness errors.
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*
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* @see gnu.xml.pipeline.PipelineFactory
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*
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* @author David Brownell
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*/
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final public class DoParse
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{
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private DoParse () { /* no instances allowed */ }
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// first reported nonrecoverable error
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private static SAXParseException fatal;
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// error categories
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private static int errorCount;
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private static int fatalCount;
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/**
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* Command line invoker for this class; pass a filename or URL
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* as the first argument, and a pipeline description as the second.
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* Make sure to use filters to condition the input to stages that
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* require it; an <em>nsfix</em> filter will be a common requirement,
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* to restore syntax that SAX2 parsers delete by default. Some
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* conditioning filters may be eliminated by setting parser options.
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* (For example, "nsfix" can set the "namespace-prefixes" feature to
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* a non-default value of "true". In the same way, "validate" can set
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* the "validation" feature to "true".)
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*/
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public static void main (String argv [])
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throws IOException
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{
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int exitStatus = 1;
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if (argv.length != 2) {
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System.err.println ("Usage: DoParse [filename|URL] pipeline-spec");
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System.err.println ("Example pipeline specs:");
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System.err.println (" 'nsfix | validate'");
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System.err.println (
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" ... restore namespace syntax, validate");
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System.err.println (" 'nsfix | write ( stdout )'");
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System.err.println (
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" ... restore namespace syntax, write to stdout as XML"
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);
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System.exit (1);
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}
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try {
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//
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// Get input source for specified document (or try ;-)
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//
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argv [0] = Resolver.getURL (argv [0]);
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InputSource input = new InputSource (argv [0]);
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//
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// Get the producer, using the system default parser (which
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// can be overridden for this particular invocation).
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//
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// And the pipeline, using commandline options.
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//
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XMLReader producer;
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EventConsumer consumer;
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producer = XMLReaderFactory.createXMLReader ();
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//
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// XXX pipeline factory now has a pre-tokenized input
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// method, use it ... that way at least some params
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// can be written using quotes (have spaces, ...)
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//
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consumer = PipelineFactory.createPipeline (argv [1]);
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//
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// XXX want commandline option for tweaking error handler.
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// Want to be able to present warnings.
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//
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producer.setErrorHandler (new MyErrorHandler ());
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// XXX need facility enabling resolving to local DTDs
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//
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// Parse. The pipeline may get optimized a bit, so we
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// can't always fail cleanly for validation without taking
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// a look at the filter stages.
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//
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EventFilter.bind (producer, consumer);
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producer.parse (input);
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try {
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if (producer.getFeature (
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"http://org.xml/sax/features/validation"))
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exitStatus = ((errorCount + fatalCount) > 0) ? 1 : 0;
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else if (fatalCount == 0)
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exitStatus = 0;
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} catch (SAXException e) {
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if (hasValidator (consumer))
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exitStatus = ((errorCount + fatalCount) > 0) ? 1 : 0;
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else if (fatalCount == 0)
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exitStatus = 0;
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}
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} catch (java.net.MalformedURLException e) {
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System.err.println ("** Malformed URL: " + e.getMessage ());
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System.err.println ("Is '" + argv [0] + "' a non-existent file?");
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e.printStackTrace ();
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// e.g. FNF
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} catch (SAXParseException e) {
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if (e != fatal) {
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System.err.print (printParseException ("Parsing Aborted", e));
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e.printStackTrace ();
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if (e.getException () != null) {
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System.err.println ("++ Wrapped exception:");
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e.getException ().printStackTrace ();
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}
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}
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} catch (SAXException e) {
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Exception x = e;
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if (e.getException () != null)
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x = e.getException ();
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x.printStackTrace ();
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} catch (Throwable t) {
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t.printStackTrace ();
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}
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System.exit (exitStatus);
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}
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// returns true if saw a validator (before end or unrecognized node)
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// false otherwise
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private static boolean hasValidator (EventConsumer e)
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{
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if (e == null)
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return false;
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if (e instanceof ValidationConsumer)
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return true;
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if (e instanceof TeeConsumer) {
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TeeConsumer t = (TeeConsumer) e;
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return hasValidator (t.getFirst ())
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|| hasValidator (t.getRest ());
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}
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if (e instanceof WellFormednessFilter
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|| e instanceof NSFilter
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)
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return hasValidator (((EventFilter)e).getNext ());
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// else ... gee, we can't know. Assume not.
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return false;
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}
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static class MyErrorHandler implements ErrorHandler
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{
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// dump validation errors, but continue
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public void error (SAXParseException e)
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throws SAXParseException
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{
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errorCount++;
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System.err.print (printParseException ("Error", e));
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}
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public void warning (SAXParseException e)
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throws SAXParseException
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{
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// System.err.print (printParseException ("Warning", e));
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}
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// try to continue fatal errors, in case a parser reports more
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public void fatalError (SAXParseException e)
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throws SAXParseException
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{
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fatalCount++;
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if (fatal == null)
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fatal = e;
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System.err.print (printParseException ("Nonrecoverable Error", e));
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}
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}
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static private String printParseException (
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String label,
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SAXParseException e
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) {
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StringBuffer buf = new StringBuffer ();
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int temp;
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buf.append ("** ");
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buf.append (label);
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buf.append (": ");
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buf.append (e.getMessage ());
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buf.append ('\n');
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if (e.getSystemId () != null) {
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buf.append (" URI: ");
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buf.append (e.getSystemId ());
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buf.append ('\n');
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}
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if ((temp = e.getLineNumber ()) != -1) {
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buf.append (" line: ");
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buf.append (temp);
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buf.append ('\n');
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}
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if ((temp = e.getColumnNumber ()) != -1) {
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buf.append (" char: ");
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buf.append (temp);
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buf.append ('\n');
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}
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return buf.toString ();
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}
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}
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