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/*
* 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 Initial Developer of the Original Code is Jonas Sicking.
* Portions created by Jonas Sicking are Copyright (C) 2001, Jonas Sicking.
* All rights reserved.
*
* Contributor(s):
* Jonas Sicking, sicking@bigfoot.com
* -- original author.
*
* NaN/Infinity code copied from the JS-library with permission from
* Netscape Communications Corporation: http://www.mozilla.org/js
* http://lxr.mozilla.org/seamonkey/source/js/src/jsinterp.c
*
*/
#include "Expr.h"
#include "ExprResult.h"
#include "txIXPathContext.h"
/*
* 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
UnaryExpr::evaluate(txIEvalContext* aContext, txAExprResult** aResult)
{
*aResult = nsnull;
nsRefPtr<txAExprResult> exprRes;
nsresult rv = expr->evaluate(aContext, getter_AddRefs(exprRes));
NS_ENSURE_SUCCESS(rv, rv);
double value = exprRes->numberValue();
#ifdef HPUX
/*
* Negation of a zero doesn't produce a negative
* zero on HPUX. Perform the operation by multiplying with
* -1.
*/
return aContext->recycler()->getNumberResult(-1 * value, aResult);
#else
return aContext->recycler()->getNumberResult(-value, aResult);
#endif
}
/*
* Returns the String representation of this Expr.
* @param dest the String to use when creating the String
* representation. The String representation will be appended to
* any data in the destination String, to allow cascading calls to
* other #toString() methods for Expressions.
* @return the String representation of this Expr.
*/
void UnaryExpr::toString(nsAString& str)
{
if (!expr)
return;
str.Append(PRUnichar('-'));
expr->toString(str);
}
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