package net.sf.saxon.functions;
import net.sf.saxon.expr.*;
import net.sf.saxon.om.Item;
import net.sf.saxon.regex.RegexIterator;
import net.sf.saxon.trans.XPathException;
import net.sf.saxon.value.AtomicValue;
import net.sf.saxon.value.NumericValue;
import net.sf.saxon.value.StringValue;
public class RegexGroup extends SystemFunction {
/**
* preEvaluate: this method suppresses compile-time evaluation by doing nothing
* @param visitor an expression visitor
*/
public Expression preEvaluate(ExpressionVisitor visitor) {
return this;
}
/**
* Evaluate in a general context
*/
public Item evaluateItem(XPathContext c) throws XPathException {
AtomicValue gp0 = (AtomicValue)argument[0].evaluateItem(c);
NumericValue gp = (NumericValue)gp0;
RegexIterator iter = c.getCurrentRegexIterator();
if (iter == null) {
return StringValue.EMPTY_STRING;
}
String s = iter.getRegexGroup((int)gp.longValue());
if (s == null) {
return StringValue.EMPTY_STRING;
}
return StringValue.makeStringValue(s);
}
/**
* Determine the dependencies
*/
public int getIntrinsicDependencies() {
return StaticProperty.DEPENDS_ON_REGEX_GROUP;
}
}
//
// The contents of this file are subject to the Mozilla Public License Version 1.0 (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.mozilla.org/MPL/
//
// Software distributed under the License is distributed on an "AS IS" basis,
// WITHOUT WARRANTY OF ANY KIND, either express or implied.
// See the License for the specific language governing rights and limitations under the License.
//
// The Original Code is: all this file.
//
// The Initial Developer of the Original Code is Michael H. Kay.
//
// Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
//
// Contributor(s): none.
//