/*
* @(#)$Id: TREXGrammarReader.java,v 1.13 2002/03/04 00:53:49 kk122374 Exp $
*
* Copyright 2001 Sun Microsystems, Inc. All Rights Reserved.
*
* This software is the proprietary information of Sun Microsystems, Inc.
* Use is subject to license terms.
*
*/
package com.sun.msv.reader.trex.classic;
import java.text.MessageFormat;
import java.util.ResourceBundle;
import java.util.Map;
import javax.xml.parsers.SAXParserFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.XMLReader;
import org.xml.sax.SAXException;
import org.relaxng.datatype.DatatypeException;
import com.sun.msv.datatype.xsd.StringType;
import com.sun.msv.datatype.xsd.XSDatatype;
import com.sun.msv.grammar.*;
import com.sun.msv.grammar.trex.*;
import com.sun.msv.reader.*;
import com.sun.msv.reader.trex.TREXBaseReader;
import com.sun.msv.reader.trex.IncludePatternState;
import com.sun.msv.reader.trex.RootState;
import com.sun.msv.reader.trex.TREXSequencedStringChecker;
import com.sun.msv.reader.datatype.DataTypeVocabulary;
import com.sun.msv.reader.datatype.xsd.XSDatatypeResolver;
import com.sun.msv.reader.datatype.xsd.XSDatatypeExp;
import com.sun.msv.util.StartTagInfo;
import org.relaxng.datatype.Datatype;
/**
* reads TREX grammar from SAX2 and constructs abstract grammar model.
*
* @author <a href="mailto:kohsuke.kawaguchi@eng.sun.com">Kohsuke KAWAGUCHI</a>
*/
public class TREXGrammarReader extends TREXBaseReader implements XSDatatypeResolver {
/** loads TREX pattern */
public static TREXGrammar parse( String grammarURL,
SAXParserFactory factory, GrammarReaderController controller )
{
TREXGrammarReader reader = new TREXGrammarReader(controller,factory,new ExpressionPool());
reader.parse(grammarURL);
return reader.getResult();
}
/** loads TREX pattern */
public static TREXGrammar parse( InputSource grammar,
SAXParserFactory factory, GrammarReaderController controller )
{
TREXGrammarReader reader = new TREXGrammarReader(controller,factory,new ExpressionPool());
reader.parse(grammar);
return reader.getResult();
}
/** easy-to-use constructor. */
public TREXGrammarReader( GrammarReaderController controller) {
this(controller,createParserFactory(),new ExpressionPool());
}
/** easy-to-use constructor. */
public TREXGrammarReader(
GrammarReaderController controller,
SAXParserFactory parserFactory,
ExpressionPool pool ) {
this(controller,parserFactory,new StateFactory(),pool);
}
/** full constructor */
public TREXGrammarReader(
GrammarReaderController controller,
SAXParserFactory parserFactory,
StateFactory stateFactory,
ExpressionPool pool ) {
super( controller, parserFactory, pool, stateFactory, new RootState() );
}
protected String localizeMessage( String propertyName, Object[] args ) {
String format;
try {
format = ResourceBundle.getBundle("com.sun.msv.reader.trex.classic.Messages").getString(propertyName);
} catch( Exception e ) {
return super.localizeMessage(propertyName,args);
}
return MessageFormat.format(format, args );
}
/**
* TREX allows either
* (1) the predefined namespace for TREX or
* (2) default namespace ""
*
* as its namespace. This variable holds which namespace is currently in use.
*/
protected String currentGrammarURI;
protected TREXGrammar getGrammar() {
return grammar;
}
/** Namespace URI of TREX */
public static final String TREXNamespace = "http://www.thaiopensource.com/trex";
protected boolean isGrammarElement( StartTagInfo tag ) {
if( currentGrammarURI==null ) {
// first time.
if( tag.namespaceURI.equals(TREXNamespace) ) {
currentGrammarURI = TREXNamespace;
return true;
}
if( tag.namespaceURI.equals("") ) {
currentGrammarURI = "";
return true;
}
return false;
} else {
if(currentGrammarURI.equals(tag.namespaceURI)) return true;
if(tag.containsAttribute(TREXNamespace,"role")) return true;
return false;
}
}
/**
* creates various State object, which in turn parses grammar.
* parsing behavior can be customized by implementing custom StateFactory.
*/
public static class StateFactory extends TREXBaseReader.StateFactory {
public State concur ( State parent, StartTagInfo tag ) { return new ConcurState(); }
public State anyString ( State parent, StartTagInfo tag ) { return new TerminalState(Expression.anyString); }
public State string ( State parent, StartTagInfo tag ) { return new StringState(); }
public State data ( State parent, StartTagInfo tag ) { return new DataState(); }
public State define ( State parent, StartTagInfo tag ) { return new DefineState(); }
public State includePattern( State parent, StartTagInfo tag ) { return new IncludePatternState(); }
}
protected StateFactory getStateFactory() {
return (StateFactory)super.sfactory;
}
private boolean issueObsoletedXMLSchemaNamespace = false;
/**
* maps obsoleted XML Schema namespace to the current one.
*/
private String mapNamespace( String namespace ) {
if(namespace.equals("http://www.w3.org/2000/10/XMLSchema")
|| namespace.equals("http://www.w3.org/2000/10/XMLSchema-datatypes")) {
// namespace of CR version.
if( !issueObsoletedXMLSchemaNamespace )
// report warning only once.
reportWarning(WRN_OBSOLETED_XMLSCHEMA_NAMSPACE,namespace);
issueObsoletedXMLSchemaNamespace = true;
return com.sun.msv.reader.datatype.xsd.XSDVocabulary.XMLSchemaNamespace;
}
return namespace;
}
public State createExpressionChildState( State parent, StartTagInfo tag )
{
if(tag.localName.equals("concur")) return getStateFactory().concur(parent,tag);
if(tag.localName.equals("anyString")) return getStateFactory().anyString(parent,tag);
if(tag.localName.equals("string")) return getStateFactory().string(parent,tag);
if(tag.localName.equals("data")) return getStateFactory().data(parent,tag);
if(tag.localName.equals("include")) return getStateFactory().includePattern(parent,tag);
final String role = tag.getAttribute(TREXNamespace,"role");
if("datatype".equals(role)) {
String namespaceURI = mapNamespace(tag.namespaceURI);
DataTypeVocabulary v = grammar.dataTypes.get(namespaceURI);
if(v==null) {
reportError( ERR_UNKNOWN_DATATYPE_VOCABULARY, tag.namespaceURI );
// put a dummy vocabulary into the map
// so that user will never receive the same error again.
grammar.dataTypes.put( tag.namespaceURI, new UndefinedDataTypeVocabulary() );
return new IgnoreState(); // recover by ignoring this element.
}
return v.createTopLevelReaderState(tag);
}
return super.createExpressionChildState(parent,tag);
}
public XSDatatypeExp resolveXSDatatype( String qName ) {
return new XSDatatypeExp( (XSDatatype)resolveDatatype(qName),pool);
}
/** obtains a named DataType object referenced by a QName.
*/
public Datatype resolveDatatype( String qName ) {
String[] s = splitQName(qName);
if(s==null) {
reportError( ERR_UNDECLARED_PREFIX, qName );
// recover by using a dummy DataType
return StringType.theInstance;
}
s[0] = mapNamespace(s[0]); // s[0] == namespace URI
DataTypeVocabulary v = grammar.dataTypes.get(s[0]);
if(v==null) {
reportError( ERR_UNKNOWN_DATATYPE_VOCABULARY, s[0] );
// put a dummy vocabulary into the map
// so that user will never receive the same error again.
grammar.dataTypes.put( s[0], new UndefinedDataTypeVocabulary() );
} else {
try {
return v.getType( s[1] ); // s[1] == local name
} catch( DatatypeException e ) {
reportError( ERR_UNDEFINED_DATATYPE, qName );
}
}
// recover by using a dummy DataType
return StringType.theInstance;
}
public void wrapUp() {
// make sure that there is no recurisve patterns.
RunAwayExpressionChecker.check(this,grammar);
if( !controller.hadError() )
// make sure that there is no sequenced string.
// when run-away expression is found, calling this method results in
// stack overflow.
grammar.visit( new TREXSequencedStringChecker(this,false) );
}
/**
* Dummy DataTypeVocabulary for better error recovery.
*
* If DataTypeVocabulary is not found, the error is reported
* and this class is used to prevent further repetitive error messages.
*/
private static class UndefinedDataTypeVocabulary implements DataTypeVocabulary
{
public State createTopLevelReaderState( StartTagInfo tag )
{ return new IgnoreState(); } // ignore everything
public Datatype getType( String localTypeName )
{ return StringType.theInstance; } // accepts any type name
}
// error messages
}