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 "txNodeSet.h"
michael@0: #include "txIXPathContext.h"
michael@0: #include "txXPathTreeWalker.h"
michael@0: 
michael@0: /**
michael@0:  *  Compares the two ExprResults based on XPath 1.0 Recommendation (section 3.4)
michael@0:  */
michael@0: bool
michael@0: RelationalExpr::compareResults(txIEvalContext* aContext, txAExprResult* aLeft,
michael@0:                                txAExprResult* aRight)
michael@0: {
michael@0:     short ltype = aLeft->getResultType();
michael@0:     short rtype = aRight->getResultType();
michael@0:     nsresult rv = NS_OK;
michael@0: 
michael@0:     // Handle case for just Left NodeSet or Both NodeSets
michael@0:     if (ltype == txAExprResult::NODESET) {
michael@0:         if (rtype == txAExprResult::BOOLEAN) {
michael@0:             BooleanResult leftBool(aLeft->booleanValue());
michael@0:             return compareResults(aContext, &leftBool, aRight);
michael@0:         }
michael@0: 
michael@0:         txNodeSet* nodeSet = static_cast<txNodeSet*>(aLeft);
michael@0:         nsRefPtr<StringResult> strResult;
michael@0:         rv = aContext->recycler()->getStringResult(getter_AddRefs(strResult));
michael@0:         NS_ENSURE_SUCCESS(rv, false);
michael@0: 
michael@0:         int32_t i;
michael@0:         for (i = 0; i < nodeSet->size(); ++i) {
michael@0:             strResult->mValue.Truncate();
michael@0:             txXPathNodeUtils::appendNodeValue(nodeSet->get(i),
michael@0:                                               strResult->mValue);
michael@0:             if (compareResults(aContext, strResult, aRight)) {
michael@0:                 return true;
michael@0:             }
michael@0:         }
michael@0: 
michael@0:         return false;
michael@0:     }
michael@0: 
michael@0:     // Handle case for Just Right NodeSet
michael@0:     if (rtype == txAExprResult::NODESET) {
michael@0:         if (ltype == txAExprResult::BOOLEAN) {
michael@0:             BooleanResult rightBool(aRight->booleanValue());
michael@0:             return compareResults(aContext, aLeft, &rightBool);
michael@0:         }
michael@0: 
michael@0:         txNodeSet* nodeSet = static_cast<txNodeSet*>(aRight);
michael@0:         nsRefPtr<StringResult> strResult;
michael@0:         rv = aContext->recycler()->getStringResult(getter_AddRefs(strResult));
michael@0:         NS_ENSURE_SUCCESS(rv, false);
michael@0: 
michael@0:         int32_t i;
michael@0:         for (i = 0; i < nodeSet->size(); ++i) {
michael@0:             strResult->mValue.Truncate();
michael@0:             txXPathNodeUtils::appendNodeValue(nodeSet->get(i),
michael@0:                                               strResult->mValue);
michael@0:             if (compareResults(aContext, aLeft, strResult)) {
michael@0:                 return true;
michael@0:             }
michael@0:         }
michael@0: 
michael@0:         return false;
michael@0:     }
michael@0: 
michael@0:     // Neither is a NodeSet
michael@0:     if (mOp == EQUAL || mOp == NOT_EQUAL) {
michael@0:         bool result;
michael@0:         const nsString *lString, *rString;
michael@0: 
michael@0:         // If either is a bool, compare as bools.
michael@0:         if (ltype == txAExprResult::BOOLEAN ||
michael@0:             rtype == txAExprResult::BOOLEAN) {
michael@0:             result = aLeft->booleanValue() == aRight->booleanValue();
michael@0:         }
michael@0: 
michael@0:         // If either is a number, compare as numbers.
michael@0:         else if (ltype == txAExprResult::NUMBER ||
michael@0:                  rtype == txAExprResult::NUMBER) {
michael@0:             double lval = aLeft->numberValue();
michael@0:             double rval = aRight->numberValue();
michael@0:             result = (lval == rval);
michael@0:         }
michael@0: 
michael@0:         // Otherwise compare as strings. Try to use the stringobject in
michael@0:         // StringResult if possible since that is a common case.
michael@0:         else if ((lString = aLeft->stringValuePointer())) {
michael@0:             if ((rString = aRight->stringValuePointer())) {
michael@0:                 result = lString->Equals(*rString);
michael@0:             }
michael@0:             else {
michael@0:                 nsAutoString rStr;
michael@0:                 aRight->stringValue(rStr);
michael@0:                 result = lString->Equals(rStr);
michael@0:             }
michael@0:         }
michael@0:         else if ((rString = aRight->stringValuePointer())) {
michael@0:             nsAutoString lStr;
michael@0:             aLeft->stringValue(lStr);
michael@0:             result = rString->Equals(lStr);
michael@0:         }
michael@0:         else {
michael@0:             nsAutoString lStr, rStr;
michael@0:             aLeft->stringValue(lStr);
michael@0:             aRight->stringValue(rStr);
michael@0:             result = lStr.Equals(rStr);
michael@0:         }
michael@0: 
michael@0:         return mOp == EQUAL ? result : !result;
michael@0:     }
michael@0: 
michael@0:     double leftDbl = aLeft->numberValue();
michael@0:     double rightDbl = aRight->numberValue();
michael@0:     switch (mOp) {
michael@0:         case LESS_THAN:
michael@0:         {
michael@0:             return (leftDbl < rightDbl);
michael@0:         }
michael@0:         case LESS_OR_EQUAL:
michael@0:         {
michael@0:             return (leftDbl <= rightDbl);
michael@0:         }
michael@0:         case GREATER_THAN:
michael@0:         {
michael@0:             return (leftDbl > rightDbl);
michael@0:         }
michael@0:         case GREATER_OR_EQUAL:
michael@0:         {
michael@0:             return (leftDbl >= rightDbl);
michael@0:         }
michael@0:         default:
michael@0:         {
michael@0:             NS_NOTREACHED("We should have caught all cases");
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     return false;
michael@0: }
michael@0: 
michael@0: nsresult
michael@0: RelationalExpr::evaluate(txIEvalContext* aContext, txAExprResult** aResult)
michael@0: {
michael@0:     *aResult = nullptr;
michael@0:     nsRefPtr<txAExprResult> lResult;
michael@0:     nsresult rv = mLeftExpr->evaluate(aContext, getter_AddRefs(lResult));
michael@0:     NS_ENSURE_SUCCESS(rv, rv);
michael@0: 
michael@0:     nsRefPtr<txAExprResult> rResult;
michael@0:     rv = mRightExpr->evaluate(aContext, getter_AddRefs(rResult));
michael@0:     NS_ENSURE_SUCCESS(rv, rv);
michael@0:     
michael@0:     aContext->recycler()->
michael@0:         getBoolResult(compareResults(aContext, lResult, rResult), aResult);
michael@0: 
michael@0:     return NS_OK;
michael@0: }
michael@0: 
michael@0: TX_IMPL_EXPR_STUBS_2(RelationalExpr, BOOLEAN_RESULT, mLeftExpr, mRightExpr)
michael@0: 
michael@0: bool
michael@0: RelationalExpr::isSensitiveTo(ContextSensitivity aContext)
michael@0: {
michael@0:     return mLeftExpr->isSensitiveTo(aContext) ||
michael@0:            mRightExpr->isSensitiveTo(aContext);
michael@0: }
michael@0: 
michael@0: #ifdef TX_TO_STRING
michael@0: void
michael@0: RelationalExpr::toString(nsAString& str)
michael@0: {
michael@0:     mLeftExpr->toString(str);
michael@0: 
michael@0:     switch (mOp) {
michael@0:         case NOT_EQUAL:
michael@0:             str.AppendLiteral("!=");
michael@0:             break;
michael@0:         case LESS_THAN:
michael@0:             str.Append(char16_t('<'));
michael@0:             break;
michael@0:         case LESS_OR_EQUAL:
michael@0:             str.AppendLiteral("<=");
michael@0:             break;
michael@0:         case GREATER_THAN :
michael@0:             str.Append(char16_t('>'));
michael@0:             break;
michael@0:         case GREATER_OR_EQUAL:
michael@0:             str.AppendLiteral(">=");
michael@0:             break;
michael@0:         default:
michael@0:             str.Append(char16_t('='));
michael@0:             break;
michael@0:     }
michael@0: 
michael@0:     mRightExpr->toString(str);
michael@0: }
michael@0: #endif