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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* The contents of this file are subject to the Mozilla Public
* License Version 1.1 (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 TransforMiiX XSLT processor.
*
* The Initial Developer of the Original Code is The MITRE Corporation.
* Portions created by MITRE are Copyright (C) 1999 The MITRE Corporation.
*
* Portions created by Keith Visco as a Non MITRE employee,
* (C) 1999 Keith Visco. All Rights Reserved.
*
* Contributor(s):
* Keith Visco, kvisco@ziplink.net
* -- original author.
*
* Marina Mechtcheriakova, mmarina@mindspring.com
* -- added lang() implementation
*
*/
#include "ExprResult.h"
#include "FunctionLib.h"
#include "nsReadableUtils.h"
#include "txAtoms.h"
#include "txIXPathContext.h"
#include "txStringUtils.h"
#include "txXPathTreeWalker.h"
/**
* Creates a default BooleanFunctionCall, which always evaluates to False
**/
BooleanFunctionCall::BooleanFunctionCall(BooleanFunctions aType)
: mType(aType)
{
}
/**
* Evaluates this Expr based on the given context node and processor state
* @param context the context node for evaluation of this Expr
* @param ps the ContextState containing the stack information needed
* for evaluation
* @return the result of the evaluation
**/
nsresult
BooleanFunctionCall::evaluate(txIEvalContext* aContext, txAExprResult** aResult)
{
*aResult = nsnull;
txListIterator iter(¶ms);
switch (mType) {
case TX_BOOLEAN:
{
if (!requireParams(1, 1, aContext))
return NS_ERROR_XPATH_BAD_ARGUMENT_COUNT;
aContext->recycler()->getBoolResult(
evaluateToBoolean((Expr*)iter.next(), aContext), aResult);
return NS_OK;
}
case TX_LANG:
{
if (!requireParams(1, 1, aContext))
return NS_ERROR_XPATH_BAD_ARGUMENT_COUNT;
txXPathTreeWalker walker(aContext->getContextNode());
nsAutoString lang;
PRBool found;
do {
found = walker.getAttr(txXMLAtoms::lang, kNameSpaceID_XML,
lang);
} while (!found && walker.moveToParent());
if (!found) {
aContext->recycler()->getBoolResult(PR_FALSE, aResult);
return NS_OK;
}
nsAutoString arg;
evaluateToString((Expr*)iter.next(), aContext, arg);
PRBool result = arg.Equals(Substring(lang, 0, arg.Length()),
txCaseInsensitiveStringComparator()) &&
(lang.Length() == arg.Length() ||
lang.CharAt(arg.Length()) == '-');
aContext->recycler()->getBoolResult(result, aResult);
return NS_OK;
}
case TX_NOT:
{
if (!requireParams(1, 1, aContext))
return NS_ERROR_XPATH_BAD_ARGUMENT_COUNT;
aContext->recycler()->getBoolResult(
!evaluateToBoolean((Expr*)iter.next(), aContext), aResult);
return NS_OK;
}
case TX_TRUE:
{
if (!requireParams(0, 0, aContext))
return NS_ERROR_XPATH_BAD_ARGUMENT_COUNT;
aContext->recycler()->getBoolResult(PR_TRUE, aResult);
return NS_OK;
}
case TX_FALSE:
{
if (!requireParams(0, 0, aContext))
return NS_ERROR_XPATH_BAD_ARGUMENT_COUNT;
aContext->recycler()->getBoolResult(PR_FALSE, aResult);
return NS_OK;
}
}
aContext->receiveError(NS_LITERAL_STRING("Internal error"),
NS_ERROR_UNEXPECTED);
return NS_ERROR_UNEXPECTED;
}
nsresult BooleanFunctionCall::getNameAtom(nsIAtom** aAtom)
{
switch (mType) {
case TX_BOOLEAN:
{
*aAtom = txXPathAtoms::boolean;
break;
}
case TX_LANG:
{
*aAtom = txXPathAtoms::lang;
break;
}
case TX_NOT:
{
*aAtom = txXPathAtoms::_not;
break;
}
case TX_TRUE:
{
*aAtom = txXPathAtoms::_true;
break;
}
case TX_FALSE:
{
*aAtom = txXPathAtoms::_false;
break;
}
default:
{
*aAtom = 0;
return NS_ERROR_FAILURE;
}
}
NS_ADDREF(*aAtom);
return NS_OK;
}
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