The Tor Browser: dom/xslt/xpath/txRelationalExpr.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/. */

     6 #include "txExpr.h"

     7 #include "txNodeSet.h"

     8 #include "txIXPathContext.h"

     9 #include "txXPathTreeWalker.h"

    11 /**

    12  *  Compares the two ExprResults based on XPath 1.0 Recommendation (section 3.4)

    13  */

    14 bool

    15 RelationalExpr::compareResults(txIEvalContext* aContext, txAExprResult* aLeft,

    16                                txAExprResult* aRight)

    17 {

    18     short ltype = aLeft->getResultType();

    19     short rtype = aRight->getResultType();

    20     nsresult rv = NS_OK;

    22     // Handle case for just Left NodeSet or Both NodeSets

    23     if (ltype == txAExprResult::NODESET) {

    24         if (rtype == txAExprResult::BOOLEAN) {

    25             BooleanResult leftBool(aLeft->booleanValue());

    26             return compareResults(aContext, &leftBool, aRight);

    27         }

    29         txNodeSet* nodeSet = static_cast<txNodeSet*>(aLeft);

    30         nsRefPtr<StringResult> strResult;

    31         rv = aContext->recycler()->getStringResult(getter_AddRefs(strResult));

    32         NS_ENSURE_SUCCESS(rv, false);

    34         int32_t i;

    35         for (i = 0; i < nodeSet->size(); ++i) {

    36             strResult->mValue.Truncate();

    37             txXPathNodeUtils::appendNodeValue(nodeSet->get(i),

    38                                               strResult->mValue);

    39             if (compareResults(aContext, strResult, aRight)) {

    40                 return true;

    41             }

    42         }

    44         return false;

    45     }

    47     // Handle case for Just Right NodeSet

    48     if (rtype == txAExprResult::NODESET) {

    49         if (ltype == txAExprResult::BOOLEAN) {

    50             BooleanResult rightBool(aRight->booleanValue());

    51             return compareResults(aContext, aLeft, &rightBool);

    52         }

    54         txNodeSet* nodeSet = static_cast<txNodeSet*>(aRight);

    55         nsRefPtr<StringResult> strResult;

    56         rv = aContext->recycler()->getStringResult(getter_AddRefs(strResult));

    57         NS_ENSURE_SUCCESS(rv, false);

    59         int32_t i;

    60         for (i = 0; i < nodeSet->size(); ++i) {

    61             strResult->mValue.Truncate();

    62             txXPathNodeUtils::appendNodeValue(nodeSet->get(i),

    63                                               strResult->mValue);

    64             if (compareResults(aContext, aLeft, strResult)) {

    65                 return true;

    66             }

    67         }

    69         return false;

    70     }

    72     // Neither is a NodeSet

    73     if (mOp == EQUAL || mOp == NOT_EQUAL) {

    74         bool result;

    75         const nsString *lString, *rString;

    77         // If either is a bool, compare as bools.

    78         if (ltype == txAExprResult::BOOLEAN ||

    79             rtype == txAExprResult::BOOLEAN) {

    80             result = aLeft->booleanValue() == aRight->booleanValue();

    81         }

    83         // If either is a number, compare as numbers.

    84         else if (ltype == txAExprResult::NUMBER ||

    85                  rtype == txAExprResult::NUMBER) {

    86             double lval = aLeft->numberValue();

    87             double rval = aRight->numberValue();

    88             result = (lval == rval);

    89         }

    91         // Otherwise compare as strings. Try to use the stringobject in

    92         // StringResult if possible since that is a common case.

    93         else if ((lString = aLeft->stringValuePointer())) {

    94             if ((rString = aRight->stringValuePointer())) {

    95                 result = lString->Equals(*rString);

    96             }

    97             else {

    98                 nsAutoString rStr;

    99                 aRight->stringValue(rStr);

   100                 result = lString->Equals(rStr);

   101             }

   102         }

   103         else if ((rString = aRight->stringValuePointer())) {

   104             nsAutoString lStr;

   105             aLeft->stringValue(lStr);

   106             result = rString->Equals(lStr);

   107         }

   108         else {

   109             nsAutoString lStr, rStr;

   110             aLeft->stringValue(lStr);

   111             aRight->stringValue(rStr);

   112             result = lStr.Equals(rStr);

   113         }

   115         return mOp == EQUAL ? result : !result;

   116     }

   118     double leftDbl = aLeft->numberValue();

   119     double rightDbl = aRight->numberValue();

   120     switch (mOp) {

   121         case LESS_THAN:

   122         {

   123             return (leftDbl < rightDbl);

   124         }

   125         case LESS_OR_EQUAL:

   126         {

   127             return (leftDbl <= rightDbl);

   128         }

   129         case GREATER_THAN:

   130         {

   131             return (leftDbl > rightDbl);

   132         }

   133         case GREATER_OR_EQUAL:

   134         {

   135             return (leftDbl >= rightDbl);

   136         }

   137         default:

   138         {

   139             NS_NOTREACHED("We should have caught all cases");

   140         }

   141     }

   143     return false;

   144 }

   146 nsresult

   147 RelationalExpr::evaluate(txIEvalContext* aContext, txAExprResult** aResult)

   148 {

   149     *aResult = nullptr;

   150     nsRefPtr<txAExprResult> lResult;

   151     nsresult rv = mLeftExpr->evaluate(aContext, getter_AddRefs(lResult));

   152     NS_ENSURE_SUCCESS(rv, rv);

   154     nsRefPtr<txAExprResult> rResult;

   155     rv = mRightExpr->evaluate(aContext, getter_AddRefs(rResult));

   156     NS_ENSURE_SUCCESS(rv, rv);

   158     aContext->recycler()->

   159         getBoolResult(compareResults(aContext, lResult, rResult), aResult);

   161     return NS_OK;

   162 }

   164 TX_IMPL_EXPR_STUBS_2(RelationalExpr, BOOLEAN_RESULT, mLeftExpr, mRightExpr)

   166 bool

   167 RelationalExpr::isSensitiveTo(ContextSensitivity aContext)

   168 {

   169     return mLeftExpr->isSensitiveTo(aContext) ||

   170            mRightExpr->isSensitiveTo(aContext);

   171 }

   173 #ifdef TX_TO_STRING

   174 void

   175 RelationalExpr::toString(nsAString& str)

   176 {

   177     mLeftExpr->toString(str);

   179     switch (mOp) {

   180         case NOT_EQUAL:

   181             str.AppendLiteral("!=");

   182             break;

   183         case LESS_THAN:

   184             str.Append(char16_t('<'));

   185             break;

   186         case LESS_OR_EQUAL:

   187             str.AppendLiteral("<=");

   188             break;

   189         case GREATER_THAN :

   190             str.Append(char16_t('>'));

   191             break;

   192         case GREATER_OR_EQUAL:

   193             str.AppendLiteral(">=");

   194             break;

   195         default:

   196             str.Append(char16_t('='));

   197             break;

   198     }

   200     mRightExpr->toString(str);

   201 }

   202 #endif

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