/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "txExpr.h"

#include "nsAtom.h"

#include "txNodeSet.h"

#include "nsGkAtoms.h"

#include "txIXPathContext.h"

  //-------------------/

 //- VariableRefExpr -/

//-------------------/

/**

 * Creates a VariableRefExpr with the given variable name

**/

VariableRefExpr::VariableRefExpr(nsAtom* aPrefix, nsAtom* aLocalName,

                                 int32_t aNSID)

    : mPrefix(aPrefix), mLocalName(aLocalName), mNamespace(aNSID)

{

    NS_ASSERTION(mLocalName, "VariableRefExpr without local name?");

    if (mPrefix == nsGkAtoms::_empty)

        mPrefix = nullptr;

}

/**

 * Evaluates this Expr based on the given context node and processor state

 * @param context the context node for evaluation of this Expr

 * @param ps the ContextState containing the stack information needed

 * for evaluation

 * @return the result of the evaluation

**/

nsresult

VariableRefExpr::evaluate(txIEvalContext* aContext, txAExprResult** aResult)

{

    nsresult rv = aContext->getVariable(mNamespace, mLocalName, *aResult);

    if (NS_FAILED(rv)) {

      // XXX report error, undefined variable

      return rv;

    }

    return NS_OK;

}

TX_IMPL_EXPR_STUBS_0(VariableRefExpr, ANY_RESULT)

bool

VariableRefExpr::isSensitiveTo(ContextSensitivity aContext)

{

    return !!(aContext & VARIABLES_CONTEXT);

}

#ifdef TX_TO_STRING

void

VariableRefExpr::toString(nsAString& aDest)

{

    aDest.Append(char16_t('$'));

    if (mPrefix) {

        nsAutoString prefix;

        mPrefix->ToString(prefix);

        aDest.Append(prefix);

        aDest.Append(char16_t(':'));

    }

    nsAutoString lname;

    mLocalName->ToString(lname);

    aDest.Append(lname);

}

#endif