michael@0: /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include "txExpr.h"
michael@0: #include "nsIAtom.h"
michael@0: #include "txNodeSet.h"
michael@0: #include "nsGkAtoms.h"
michael@0: #include "txIXPathContext.h"
michael@0: 
michael@0:   //-------------------/
michael@0:  //- VariableRefExpr -/
michael@0: //-------------------/
michael@0: 
michael@0: /**
michael@0:  * Creates a VariableRefExpr with the given variable name
michael@0: **/
michael@0: VariableRefExpr::VariableRefExpr(nsIAtom* aPrefix, nsIAtom* aLocalName,
michael@0:                                  int32_t aNSID)
michael@0:     : mPrefix(aPrefix), mLocalName(aLocalName), mNamespace(aNSID)
michael@0: {
michael@0:     NS_ASSERTION(mLocalName, "VariableRefExpr without local name?");
michael@0:     if (mPrefix == nsGkAtoms::_empty)
michael@0:         mPrefix = 0;
michael@0: }
michael@0: 
michael@0: /**
michael@0:  * Evaluates this Expr based on the given context node and processor state
michael@0:  * @param context the context node for evaluation of this Expr
michael@0:  * @param ps the ContextState containing the stack information needed
michael@0:  * for evaluation
michael@0:  * @return the result of the evaluation
michael@0: **/
michael@0: nsresult
michael@0: VariableRefExpr::evaluate(txIEvalContext* aContext, txAExprResult** aResult)
michael@0: {
michael@0:     nsresult rv = aContext->getVariable(mNamespace, mLocalName, *aResult);
michael@0:     if (NS_FAILED(rv)) {
michael@0:       // XXX report error, undefined variable
michael@0:       return rv;
michael@0:     }
michael@0:     return NS_OK;
michael@0: }
michael@0: 
michael@0: TX_IMPL_EXPR_STUBS_0(VariableRefExpr, ANY_RESULT)
michael@0: 
michael@0: bool
michael@0: VariableRefExpr::isSensitiveTo(ContextSensitivity aContext)
michael@0: {
michael@0:     return !!(aContext & VARIABLES_CONTEXT);
michael@0: }
michael@0: 
michael@0: #ifdef TX_TO_STRING
michael@0: void
michael@0: VariableRefExpr::toString(nsAString& aDest)
michael@0: {
michael@0:     aDest.Append(char16_t('$'));
michael@0:     if (mPrefix) {
michael@0:         nsAutoString prefix;
michael@0:         mPrefix->ToString(prefix);
michael@0:         aDest.Append(prefix);
michael@0:         aDest.Append(char16_t(':'));
michael@0:     }
michael@0:     nsAutoString lname;
michael@0:     mLocalName->ToString(lname);
michael@0:     aDest.Append(lname);
michael@0: }
michael@0: #endif