package com.xmlcalabash.functions;
import com.xmlcalabash.runtime.XCompoundStep;
import net.sf.saxon.expr.Expression;
import net.sf.saxon.expr.StaticContext;
import net.sf.saxon.expr.XPathContext;
import net.sf.saxon.lib.ExtensionFunctionCall;
import net.sf.saxon.lib.ExtensionFunctionDefinition;
import net.sf.saxon.om.Item;
import net.sf.saxon.om.Sequence;
import net.sf.saxon.om.SequenceIterator;
import net.sf.saxon.om.StructuredQName;
import net.sf.saxon.trans.XPathException;
import net.sf.saxon.tree.iter.SingletonIterator;
import net.sf.saxon.value.BooleanValue;
import net.sf.saxon.value.SequenceType;
import net.sf.saxon.s9api.QName;
import com.xmlcalabash.core.XProcRuntime;
import com.xmlcalabash.core.XProcException;
import com.xmlcalabash.core.XProcConstants;
import com.xmlcalabash.runtime.XStep;
import java.util.Hashtable;
//
// 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 Norman Walsh are Copyright (C) Mark Logic Corporation. All Rights Reserved.
//
// Contributor(s): Norman Walsh.
//
/**
* Implementation of the XProc p:step-available function
*/
public class ValueAvailable extends XProcExtensionFunctionDefinition {
private static StructuredQName funcname = new StructuredQName("p", XProcConstants.NS_XPROC, "value-available");
protected ValueAvailable() {
// you can't call this one
}
public ValueAvailable(XProcRuntime runtime) {
registry.registerRuntime(this, runtime);
}
public StructuredQName getFunctionQName() {
return funcname;
}
public int getMinimumNumberOfArguments() {
return 1;
}
public int getMaximumNumberOfArguments() {
return 2;
}
public SequenceType[] getArgumentTypes() {
return new SequenceType[]{SequenceType.SINGLE_STRING, SequenceType.OPTIONAL_BOOLEAN};
}
public SequenceType getResultType(SequenceType[] suppliedArgumentTypes) {
return SequenceType.SINGLE_ATOMIC;
}
public ExtensionFunctionCall makeCallExpression() {
return new ValueAvailableCall(this);
}
private class ValueAvailableCall extends ExtensionFunctionCall {
private StaticContext staticContext = null;
private XProcExtensionFunctionDefinition xdef = null;
public ValueAvailableCall(XProcExtensionFunctionDefinition def) {
xdef = def;
}
public void supplyStaticContext(StaticContext context, int locationId, Expression[] arguments) throws XPathException {
staticContext = context;
}
public Sequence call(XPathContext xPathContext, Sequence[] sequences) throws XPathException {
StructuredQName sVarName = null;
XProcRuntime runtime = registry.getRuntime(xdef);
XStep step = runtime.getXProcData().getStep();
// FIXME: this can't be the best way to do this...
// step == null in use-when
if (step != null && !(step instanceof XCompoundStep)) {
throw XProcException.dynamicError(23);
}
try {
String lexicalQName = sequences[0].head().getStringValue();
sVarName = StructuredQName.fromLexicalQName(
lexicalQName,
false,
false,
xPathContext.getConfiguration().getNameChecker(),
staticContext.getNamespaceResolver());
} catch (XPathException e) {
// FIXME: bad formatting
throw new XProcException("Invalid variable/option name. " + e.getMessage() + "XTDE1390");
}
boolean failIfUnknown = true;
if (sequences.length > 1) {
failIfUnknown = ((BooleanValue) sequences[1].head()).effectiveBooleanValue();
}
boolean value = false;
QName varName = new QName(sVarName.getURI(), sVarName.getLocalPart());
value = step.hasInScopeVariableBinding(varName);
if (!value) {
if (failIfUnknown) {
throw XProcException.dynamicError(33);
}
} else {
value = step.hasInScopeVariableValue(varName);
}
return value ? BooleanValue.TRUE : BooleanValue.FALSE;
}
}
}