dom/xslt/xpath/txVariableRefExpr.cpp

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #include "txExpr.h"
   7 #include "nsAtom.h"
   8 #include "txNodeSet.h"
   9 #include "nsGkAtoms.h"
  10 #include "txIXPathContext.h"
  11
  12 //-------------------/
  13 //- VariableRefExpr -/
  14 //-------------------/
  15
  16 /**
  17  * Creates a VariableRefExpr with the given variable name
  18  **/
  19 VariableRefExpr::VariableRefExpr(nsAtom* aPrefix, nsAtom* aLocalName,
  20                                  int32_t aNSID)
  21     : mPrefix(aPrefix), mLocalName(aLocalName), mNamespace(aNSID) {
  22   NS_ASSERTION(mLocalName, "VariableRefExpr without local name?");
  23   if (mPrefix == nsGkAtoms::_empty) mPrefix = nullptr;
  24 }
  25
  26 /**
  27  * Evaluates this Expr based on the given context node and processor state
  28  * @param context the context node for evaluation of this Expr
  29  * @param ps the ContextState containing the stack information needed
  30  * for evaluation
  31  * @return the result of the evaluation
  32  **/
  33 nsresult VariableRefExpr::evaluate(txIEvalContext* aContext,
  34                                    txAExprResult** aResult) {
  35   nsresult rv = aContext->getVariable(mNamespace, mLocalName, *aResult);
  36   if (NS_FAILED(rv)) {
  37     // XXX report error, undefined variable
  38     return rv;
  39   }
  40   return NS_OK;
  41 }
  42
  43 TX_IMPL_EXPR_STUBS_0(VariableRefExpr, ANY_RESULT)
  44
  45 bool VariableRefExpr::isSensitiveTo(ContextSensitivity aContext) {
  46   return !!(aContext & VARIABLES_CONTEXT);
  47 }
  48
  49 #ifdef TX_TO_STRING
  50 void VariableRefExpr::toString(nsAString& aDest) {
  51   aDest.Append(char16_t('$'));
  52   if (mPrefix) {
  53     nsAutoString prefix;
  54     mPrefix->ToString(prefix);
  55     aDest.Append(prefix);
  56     aDest.Append(char16_t(':'));
  57   }
  58   nsAutoString lname;
  59   mLocalName->ToString(lname);
  60   aDest.Append(lname);
  61 }
  62 #endif