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lightning-sunbird  0.9+nobinonly
UnaryExpr.cpp
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00001 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
00003  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00004  *
00005  * The contents of this file are subject to the Mozilla Public License Version
00006  * 1.1 (the "License"); you may not use this file except in compliance with
00007  * the License. You may obtain a copy of the License at
00008  * http://www.mozilla.org/MPL/
00009  *
00010  * Software distributed under the License is distributed on an "AS IS" basis,
00011  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00012  * for the specific language governing rights and limitations under the
00013  * License.
00014  *
00015  * The Original Code is TransforMiiX XSLT processor code.
00016  *
00017  * The Initial Developer of the Original Code is
00018  * Jonas Sicking.
00019  * Portions created by the Initial Developer are Copyright (C) 2001
00020  * the Initial Developer. All Rights Reserved.
00021  *
00022  * Contributor(s):
00023  *   Jonas Sicking <sicking@bigfoot.com> (Original Author)
00024  *
00025  * Alternatively, the contents of this file may be used under the terms of
00026  * either the GNU General Public License Version 2 or later (the "GPL"), or
00027  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00028  * in which case the provisions of the GPL or the LGPL are applicable instead
00029  * of those above. If you wish to allow use of your version of this file only
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00036  *
00037  * ***** END LICENSE BLOCK ***** */
00038 
00039 #include "Expr.h"
00040 #include "ExprResult.h"
00041 #include "txIXPathContext.h"
00042 
00043 /*
00044  * Evaluates this Expr based on the given context node and processor state
00045  * @param context the context node for evaluation of this Expr
00046  * @param ps the ContextState containing the stack information needed
00047  * for evaluation.
00048  * @return the result of the evaluation.
00049  */
00050 nsresult
00051 UnaryExpr::evaluate(txIEvalContext* aContext, txAExprResult** aResult)
00052 {
00053     *aResult = nsnull;
00054 
00055     nsRefPtr<txAExprResult> exprRes;
00056     nsresult rv = expr->evaluate(aContext, getter_AddRefs(exprRes));
00057     NS_ENSURE_SUCCESS(rv, rv);
00058 
00059     double value = exprRes->numberValue();
00060 #ifdef HPUX
00061     /*
00062      * Negation of a zero doesn't produce a negative
00063      * zero on HPUX. Perform the operation by multiplying with
00064      * -1.
00065      */
00066     return aContext->recycler()->getNumberResult(-1 * value, aResult);
00067 #else
00068     return aContext->recycler()->getNumberResult(-value, aResult);
00069 #endif
00070 }
00071 
00072 #ifdef TX_TO_STRING
00073 void
00074 UnaryExpr::toString(nsAString& str)
00075 {
00076     if (!expr)
00077         return;
00078     str.Append(PRUnichar('-'));
00079     expr->toString(str);
00080 }
00081 #endif