package org.pdf4j.saxon.style;
import org.pdf4j.saxon.expr.Expression;
import org.pdf4j.saxon.expr.Literal;
import org.pdf4j.saxon.instruct.Executable;
import org.pdf4j.saxon.instruct.While;
import org.pdf4j.saxon.om.AttributeCollection;
import org.pdf4j.saxon.om.Axis;
import org.pdf4j.saxon.om.StandardNames;
import org.pdf4j.saxon.trans.XPathException;
import org.pdf4j.saxon.value.EmptySequence;
/**
* Handler for saxon:while elements in stylesheet.
* The saxon:while element has a mandatory attribute test, a boolean expression.
* The content is output repeatedly so long as the test condition is true.
*/
public class SaxonWhile extends StyleElement {
private Expression test;
/**
* Determine whether this node is an instruction.
* @return true - it is an instruction
*/
public boolean isInstruction() {
return true;
}
/**
* Determine whether this type of element is allowed to contain a template-body
* @return true: yes, it may contain a template-body
*/
public boolean mayContainSequenceConstructor() {
return true;
}
public void prepareAttributes() throws XPathException {
String testAtt=null;
AttributeCollection atts = getAttributeList();
for (int a=0; a<atts.getLength(); a++) {
int nc = atts.getNameCode(a);
String f = getNamePool().getClarkName(nc);
if (f==StandardNames.TEST) {
testAtt = atts.getValue(a);
} else {
checkUnknownAttribute(nc);
}
}
if (testAtt==null) {
reportAbsence("test");
return;
}
test = makeExpression(testAtt);
}
public void validate() throws XPathException {
//checkWithinTemplate();
test = typeCheck("test", test);
}
public Expression compile(Executable exec) throws XPathException {
Expression action = compileSequenceConstructor(exec, iterateAxis(Axis.CHILD), true);
if (action == null) {
action = Literal.makeEmptySequence();
}
While w = new While(test, action);
return w;
}
}
//
// 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.
//