The Tor Browser: dom/xslt/xpath/txBooleanExpr.cpp@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

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

     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/. */

     7 /**

     8  * Represents a BooleanExpr, a binary expression that

     9  * performs a boolean operation between its lvalue and rvalue.

    10 **/

    12 #include "txExpr.h"

    13 #include "txIXPathContext.h"

    15 /**

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

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

    18  * @param ps the ContextState containing the stack information needed

    19  * for evaluation

    20  * @return the result of the evaluation

    21 **/

    22 nsresult

    23 BooleanExpr::evaluate(txIEvalContext* aContext, txAExprResult** aResult)

    24 {

    25     *aResult = nullptr;

    27     bool lval;

    28     nsresult rv = leftExpr->evaluateToBool(aContext, lval);

    29     NS_ENSURE_SUCCESS(rv, rv);

    31     // check for early decision

    32     if (op == OR && lval) {

    33         aContext->recycler()->getBoolResult(true, aResult);

    35         return NS_OK;

    36     }

    37     if (op == AND && !lval) {

    38         aContext->recycler()->getBoolResult(false, aResult);

    40         return NS_OK;

    41     }

    43     bool rval;

    44     rv = rightExpr->evaluateToBool(aContext, rval);

    45     NS_ENSURE_SUCCESS(rv, rv);

    47     // just use rval, since we already checked lval

    48     aContext->recycler()->getBoolResult(rval, aResult);

    50     return NS_OK;

    51 } //-- evaluate

    53 TX_IMPL_EXPR_STUBS_2(BooleanExpr, BOOLEAN_RESULT, leftExpr, rightExpr)

    55 bool

    56 BooleanExpr::isSensitiveTo(ContextSensitivity aContext)

    57 {

    58     return leftExpr->isSensitiveTo(aContext) ||

    59            rightExpr->isSensitiveTo(aContext);

    60 }

    62 #ifdef TX_TO_STRING

    63 void

    64 BooleanExpr::toString(nsAString& str)

    65 {

    66     if ( leftExpr ) leftExpr->toString(str);

    67     else str.AppendLiteral("null");

    69     switch ( op ) {

    70         case OR:

    71             str.AppendLiteral(" or ");

    72             break;

    73         default:

    74             str.AppendLiteral(" and ");

    75             break;

    76     }

    77     if ( rightExpr ) rightExpr->toString(str);

    78     else str.AppendLiteral("null");

    80 }

    81 #endif

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