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package org.jaxen.pattern; |
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import java.util.Iterator; |
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import java.util.List; |
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import java.util.ListIterator; |
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import org.jaxen.JaxenException; |
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import org.jaxen.JaxenHandler; |
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import org.jaxen.expr.DefaultAllNodeStep; |
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import org.jaxen.expr.DefaultCommentNodeStep; |
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import org.jaxen.expr.DefaultFilterExpr; |
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import org.jaxen.expr.DefaultNameStep; |
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import org.jaxen.expr.DefaultProcessingInstructionNodeStep; |
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import org.jaxen.expr.DefaultStep; |
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import org.jaxen.expr.DefaultTextNodeStep; |
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import org.jaxen.expr.DefaultXPathFactory; |
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import org.jaxen.expr.Expr; |
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import org.jaxen.expr.FilterExpr; |
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import org.jaxen.expr.LocationPath; |
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import org.jaxen.expr.Predicate; |
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import org.jaxen.expr.PredicateSet; |
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import org.jaxen.expr.Step; |
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import org.jaxen.expr.UnionExpr; |
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import org.jaxen.saxpath.Axis; |
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import org.jaxen.saxpath.XPathReader; |
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import org.jaxen.saxpath.helpers.XPathReaderFactory; |
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public class PatternParser |
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{ |
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private static final boolean TRACE = false; |
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private static final boolean USE_HANDLER = false; |
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public static Pattern parse(String text) throws JaxenException, org.jaxen.saxpath.SAXPathException |
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{ |
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if ( USE_HANDLER ) |
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{ |
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XPathReader reader = XPathReaderFactory.createReader(); |
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PatternHandler handler = new PatternHandler(); |
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handler.setXPathFactory( new DefaultXPathFactory() ); |
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reader.setXPathHandler( handler ); |
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reader.parse( text ); |
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return handler.getPattern(); |
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} |
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else |
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{ |
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XPathReader reader = XPathReaderFactory.createReader(); |
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JaxenHandler handler = new JaxenHandler(); |
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handler.setXPathFactory( new DefaultXPathFactory() ); |
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reader.setXPathHandler( handler ); |
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reader.parse( text ); |
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Pattern pattern = convertExpr( handler.getXPathExpr().getRootExpr() ); |
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return pattern.simplify(); |
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} |
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} |
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protected static Pattern convertExpr(Expr expr) throws JaxenException |
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{ |
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if ( TRACE ) |
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{ |
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System.out.println( "Converting: " + expr + " into a pattern." ); |
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} |
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if ( expr instanceof LocationPath ) |
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{ |
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return convertExpr( (LocationPath) expr ); |
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} |
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else if ( expr instanceof FilterExpr ) |
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{ |
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LocationPathPattern answer = new LocationPathPattern(); |
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answer.addFilter( (FilterExpr) expr ); |
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return answer; |
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} |
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else if ( expr instanceof UnionExpr ) |
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{ |
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UnionExpr unionExpr = (UnionExpr) expr; |
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Pattern lhs = convertExpr( unionExpr.getLHS() ); |
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Pattern rhs = convertExpr( unionExpr.getRHS() ); |
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return new UnionPattern( lhs, rhs ); |
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} |
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else |
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{ |
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LocationPathPattern answer = new LocationPathPattern(); |
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answer.addFilter( new DefaultFilterExpr( expr, |
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new PredicateSet()) ); |
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return answer; |
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} |
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} |
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protected static LocationPathPattern convertExpr(LocationPath locationPath) throws JaxenException |
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{ |
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LocationPathPattern answer = new LocationPathPattern(); |
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List steps = locationPath.getSteps(); |
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LocationPathPattern path = answer; |
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boolean first = true; |
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for ( ListIterator iter = steps.listIterator( steps.size() ); iter.hasPrevious(); ) |
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{ |
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Step step = (Step) iter.previous(); |
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if ( first ) |
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{ |
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first = false; |
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path = convertStep( path, step ); |
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} |
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else |
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{ |
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if ( navigationStep( step ) ) |
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{ |
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LocationPathPattern parent = new LocationPathPattern(); |
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int axis = step.getAxis(); |
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if ( axis == Axis.DESCENDANT || axis == Axis.DESCENDANT_OR_SELF ) |
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{ |
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path.setAncestorPattern( parent ); |
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} |
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else |
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{ |
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path.setParentPattern( parent ); |
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} |
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path = parent; |
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} |
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path = convertStep( path, step ); |
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} |
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} |
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if ( locationPath.isAbsolute() ) |
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{ |
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LocationPathPattern parent = new LocationPathPattern( NodeTypeTest.DOCUMENT_TEST ); |
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path.setParentPattern( parent ); |
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} |
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return answer; |
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} |
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protected static LocationPathPattern convertStep(LocationPathPattern path, Step step) throws JaxenException |
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{ |
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if ( step instanceof DefaultAllNodeStep ) |
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{ |
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int axis = step.getAxis(); |
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if ( axis == Axis.ATTRIBUTE ) |
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{ |
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path.setNodeTest( NodeTypeTest.ATTRIBUTE_TEST ); |
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} |
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else |
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{ |
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path.setNodeTest( NodeTypeTest.ELEMENT_TEST ); |
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} |
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} |
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else if ( step instanceof DefaultCommentNodeStep ) |
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{ |
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path.setNodeTest( NodeTypeTest.COMMENT_TEST ); |
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} |
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else if ( step instanceof DefaultProcessingInstructionNodeStep ) |
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{ |
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path.setNodeTest( NodeTypeTest.PROCESSING_INSTRUCTION_TEST ); |
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} |
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else if ( step instanceof DefaultTextNodeStep ) |
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{ |
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path.setNodeTest( TextNodeTest.SINGLETON ); |
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} |
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else if ( step instanceof DefaultCommentNodeStep ) |
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{ |
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path.setNodeTest( NodeTypeTest.COMMENT_TEST ); |
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} |
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else if ( step instanceof DefaultNameStep ) |
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{ |
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DefaultNameStep nameStep = (DefaultNameStep) step; |
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String localName = nameStep.getLocalName(); |
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String prefix = nameStep.getPrefix(); |
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int axis = nameStep.getAxis(); |
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short nodeType = Pattern.ELEMENT_NODE; |
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if ( axis == Axis.ATTRIBUTE ) |
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{ |
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nodeType = Pattern.ATTRIBUTE_NODE; |
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} |
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if ( nameStep.isMatchesAnyName() ) |
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{ |
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if ( prefix.length() == 0 || prefix.equals( "*" ) ) |
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{ |
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if ( axis == Axis.ATTRIBUTE ) |
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{ |
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path.setNodeTest( NodeTypeTest.ATTRIBUTE_TEST ); |
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} |
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else |
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{ |
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path.setNodeTest( NodeTypeTest.ELEMENT_TEST ); |
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} |
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} |
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else |
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{ |
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path.setNodeTest( new NamespaceTest( prefix, nodeType ) ); |
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} |
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} |
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else |
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{ |
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path.setNodeTest( new NameTest( localName, nodeType ) ); |
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} |
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return convertDefaultStep(path, nameStep); |
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} |
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else if ( step instanceof DefaultStep ) |
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{ |
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return convertDefaultStep(path, (DefaultStep) step); |
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} |
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else |
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{ |
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throw new JaxenException( "Cannot convert: " + step + " to a Pattern" ); |
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} |
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return path; |
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} |
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protected static LocationPathPattern convertDefaultStep(LocationPathPattern path, DefaultStep step) throws JaxenException |
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{ |
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List predicates = step.getPredicates(); |
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if ( ! predicates.isEmpty() ) |
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{ |
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FilterExpr filter = new DefaultFilterExpr(new PredicateSet()); |
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for ( Iterator iter = predicates.iterator(); iter.hasNext(); ) |
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{ |
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filter.addPredicate( (Predicate) iter.next() ); |
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} |
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path.addFilter( filter ); |
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} |
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return path; |
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} |
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protected static boolean navigationStep( Step step ) |
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{ |
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if ( step instanceof DefaultNameStep ) |
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{ |
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return true; |
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} |
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else |
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if ( step.getClass().equals( DefaultStep.class ) ) |
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{ |
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return ! step.getPredicates().isEmpty(); |
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} |
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else |
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{ |
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return true; |
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} |
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} |
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} |
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