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lightning-sunbird  0.9+nobinonly
VariableRefExpr.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  * The MITRE Corporation.
00019  * Portions created by the Initial Developer are Copyright (C) 1999
00020  * the Initial Developer. All Rights Reserved.
00021  *
00022  * Contributor(s):
00023  *   Keith Visco <kvisco@ziplink.net> (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
00030  * under the terms of either the GPL or the LGPL, and not to allow others to
00031  * use your version of this file under the terms of the MPL, indicate your
00032  * decision by deleting the provisions above and replace them with the notice
00033  * and other provisions required by the GPL or the LGPL. If you do not delete
00034  * the provisions above, a recipient may use your version of this file under
00035  * the terms of any one of the MPL, the GPL or the LGPL.
00036  *
00037  * ***** END LICENSE BLOCK ***** */
00038 
00039 #include "Expr.h"
00040 #include "nsIAtom.h"
00041 #include "txNodeSet.h"
00042 #include "txAtoms.h"
00043 #include "txIXPathContext.h"
00044 
00045   //-------------------/
00046  //- VariableRefExpr -/
00047 //-------------------/
00048 
00052 VariableRefExpr::VariableRefExpr(nsIAtom* aPrefix, nsIAtom* aLocalName,
00053                                  PRInt32 aNSID)
00054     : mPrefix(aPrefix), mLocalName(aLocalName), mNamespace(aNSID)
00055 {
00056     NS_ASSERTION(mLocalName, "VariableRefExpr without local name?");
00057     if (mPrefix == txXMLAtoms::_empty)
00058         mPrefix = 0;
00059 }
00060 
00061 /*
00062  * Release the local name atom
00063  */
00064 VariableRefExpr::~VariableRefExpr()
00065 {
00066 }
00067 
00075 nsresult
00076 VariableRefExpr::evaluate(txIEvalContext* aContext, txAExprResult** aResult)
00077 {
00078     nsresult rv = aContext->getVariable(mNamespace, mLocalName, *aResult);
00079     if (NS_FAILED(rv)) {
00080       // XXX report error, undefined variable
00081       return rv;
00082     }
00083     return NS_OK;
00084 }
00085 
00086 #ifdef TX_TO_STRING
00087 void
00088 VariableRefExpr::toString(nsAString& aDest)
00089 {
00090     aDest.Append(PRUnichar('$'));
00091     if (mPrefix) {
00092         nsAutoString prefix;
00093         mPrefix->ToString(prefix);
00094         aDest.Append(prefix);
00095         aDest.Append(PRUnichar(':'));
00096     }
00097     nsAutoString lname;
00098     mLocalName->ToString(lname);
00099     aDest.Append(lname);
00100 }
00101 #endif