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lightning-sunbird  0.9+nobinonly
BooleanFunctionCall.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 "ExprResult.h"
00040 #include "FunctionLib.h"
00041 #include "nsReadableUtils.h"
00042 #include "txAtoms.h"
00043 #include "txError.h"
00044 #include "txIXPathContext.h"
00045 #include "txStringUtils.h"
00046 #include "txXPathTreeWalker.h"
00047 
00051 BooleanFunctionCall::BooleanFunctionCall(BooleanFunctions aType)
00052     : mType(aType)
00053 {
00054 }
00055 
00063 nsresult
00064 BooleanFunctionCall::evaluate(txIEvalContext* aContext, txAExprResult** aResult)
00065 {
00066     *aResult = nsnull;
00067 
00068     txListIterator iter(&params);
00069     switch (mType) {
00070         case TX_BOOLEAN:
00071         {
00072             if (!requireParams(1, 1, aContext))
00073                 return NS_ERROR_XPATH_BAD_ARGUMENT_COUNT;
00074 
00075             aContext->recycler()->getBoolResult(
00076                 evaluateToBoolean((Expr*)iter.next(), aContext), aResult);
00077 
00078             return NS_OK;
00079         }
00080         case TX_LANG:
00081         {
00082             if (!requireParams(1, 1, aContext))
00083                 return NS_ERROR_XPATH_BAD_ARGUMENT_COUNT;
00084 
00085             txXPathTreeWalker walker(aContext->getContextNode());
00086 
00087             nsAutoString lang;
00088             PRBool found;
00089             do {
00090                 found = walker.getAttr(txXMLAtoms::lang, kNameSpaceID_XML,
00091                                        lang);
00092             } while (!found && walker.moveToParent());
00093 
00094             if (!found) {
00095                 aContext->recycler()->getBoolResult(PR_FALSE, aResult);
00096 
00097                 return NS_OK;
00098             }
00099 
00100             nsAutoString arg;
00101             evaluateToString((Expr*)iter.next(), aContext, arg);
00102             PRBool result = arg.Equals(Substring(lang, 0, arg.Length()),
00103                                        txCaseInsensitiveStringComparator()) &&
00104                             (lang.Length() == arg.Length() ||
00105                              lang.CharAt(arg.Length()) == '-');
00106 
00107             aContext->recycler()->getBoolResult(result, aResult);
00108 
00109             return NS_OK;
00110         }
00111         case TX_NOT:
00112         {
00113             if (!requireParams(1, 1, aContext))
00114                 return NS_ERROR_XPATH_BAD_ARGUMENT_COUNT;
00115 
00116             aContext->recycler()->getBoolResult(
00117                   !evaluateToBoolean((Expr*)iter.next(), aContext), aResult);
00118 
00119             return NS_OK;
00120         }
00121         case TX_TRUE:
00122         {
00123             if (!requireParams(0, 0, aContext))
00124                 return NS_ERROR_XPATH_BAD_ARGUMENT_COUNT;
00125 
00126             aContext->recycler()->getBoolResult(PR_TRUE, aResult);
00127 
00128             return NS_OK;
00129         }
00130         case TX_FALSE:
00131         {
00132             if (!requireParams(0, 0, aContext))
00133                 return NS_ERROR_XPATH_BAD_ARGUMENT_COUNT;
00134 
00135             aContext->recycler()->getBoolResult(PR_FALSE, aResult);
00136 
00137             return NS_OK;
00138         }
00139     }
00140 
00141     aContext->receiveError(NS_LITERAL_STRING("Internal error"),
00142                            NS_ERROR_UNEXPECTED);
00143     return NS_ERROR_UNEXPECTED;
00144 }
00145 
00146 #ifdef TX_TO_STRING
00147 nsresult
00148 BooleanFunctionCall::getNameAtom(nsIAtom** aAtom)
00149 {
00150     switch (mType) {
00151         case TX_BOOLEAN:
00152         {
00153             *aAtom = txXPathAtoms::boolean;
00154             break;
00155         }
00156         case TX_LANG:
00157         {
00158             *aAtom = txXPathAtoms::lang;
00159             break;
00160         }
00161         case TX_NOT:
00162         {
00163             *aAtom = txXPathAtoms::_not;
00164             break;
00165         }
00166         case TX_TRUE:
00167         {
00168             *aAtom = txXPathAtoms::_true;
00169             break;
00170         }
00171         case TX_FALSE:
00172         {
00173             *aAtom = txXPathAtoms::_false;
00174             break;
00175         }
00176         default:
00177         {
00178             *aAtom = 0;
00179             return NS_ERROR_FAILURE;
00180         }
00181     }
00182     NS_ADDREF(*aAtom);
00183     return NS_OK;
00184 }
00185 #endif