1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/dom/xslt/xpath/txRelationalExpr.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,202 @@
1.4 +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +#include "txExpr.h"
1.10 +#include "txNodeSet.h"
1.11 +#include "txIXPathContext.h"
1.12 +#include "txXPathTreeWalker.h"
1.13 +
1.14 +/**
1.15 + * Compares the two ExprResults based on XPath 1.0 Recommendation (section 3.4)
1.16 + */
1.17 +bool
1.18 +RelationalExpr::compareResults(txIEvalContext* aContext, txAExprResult* aLeft,
1.19 + txAExprResult* aRight)
1.20 +{
1.21 + short ltype = aLeft->getResultType();
1.22 + short rtype = aRight->getResultType();
1.23 + nsresult rv = NS_OK;
1.24 +
1.25 + // Handle case for just Left NodeSet or Both NodeSets
1.26 + if (ltype == txAExprResult::NODESET) {
1.27 + if (rtype == txAExprResult::BOOLEAN) {
1.28 + BooleanResult leftBool(aLeft->booleanValue());
1.29 + return compareResults(aContext, &leftBool, aRight);
1.30 + }
1.31 +
1.32 + txNodeSet* nodeSet = static_cast<txNodeSet*>(aLeft);
1.33 + nsRefPtr<StringResult> strResult;
1.34 + rv = aContext->recycler()->getStringResult(getter_AddRefs(strResult));
1.35 + NS_ENSURE_SUCCESS(rv, false);
1.36 +
1.37 + int32_t i;
1.38 + for (i = 0; i < nodeSet->size(); ++i) {
1.39 + strResult->mValue.Truncate();
1.40 + txXPathNodeUtils::appendNodeValue(nodeSet->get(i),
1.41 + strResult->mValue);
1.42 + if (compareResults(aContext, strResult, aRight)) {
1.43 + return true;
1.44 + }
1.45 + }
1.46 +
1.47 + return false;
1.48 + }
1.49 +
1.50 + // Handle case for Just Right NodeSet
1.51 + if (rtype == txAExprResult::NODESET) {
1.52 + if (ltype == txAExprResult::BOOLEAN) {
1.53 + BooleanResult rightBool(aRight->booleanValue());
1.54 + return compareResults(aContext, aLeft, &rightBool);
1.55 + }
1.56 +
1.57 + txNodeSet* nodeSet = static_cast<txNodeSet*>(aRight);
1.58 + nsRefPtr<StringResult> strResult;
1.59 + rv = aContext->recycler()->getStringResult(getter_AddRefs(strResult));
1.60 + NS_ENSURE_SUCCESS(rv, false);
1.61 +
1.62 + int32_t i;
1.63 + for (i = 0; i < nodeSet->size(); ++i) {
1.64 + strResult->mValue.Truncate();
1.65 + txXPathNodeUtils::appendNodeValue(nodeSet->get(i),
1.66 + strResult->mValue);
1.67 + if (compareResults(aContext, aLeft, strResult)) {
1.68 + return true;
1.69 + }
1.70 + }
1.71 +
1.72 + return false;
1.73 + }
1.74 +
1.75 + // Neither is a NodeSet
1.76 + if (mOp == EQUAL || mOp == NOT_EQUAL) {
1.77 + bool result;
1.78 + const nsString *lString, *rString;
1.79 +
1.80 + // If either is a bool, compare as bools.
1.81 + if (ltype == txAExprResult::BOOLEAN ||
1.82 + rtype == txAExprResult::BOOLEAN) {
1.83 + result = aLeft->booleanValue() == aRight->booleanValue();
1.84 + }
1.85 +
1.86 + // If either is a number, compare as numbers.
1.87 + else if (ltype == txAExprResult::NUMBER ||
1.88 + rtype == txAExprResult::NUMBER) {
1.89 + double lval = aLeft->numberValue();
1.90 + double rval = aRight->numberValue();
1.91 + result = (lval == rval);
1.92 + }
1.93 +
1.94 + // Otherwise compare as strings. Try to use the stringobject in
1.95 + // StringResult if possible since that is a common case.
1.96 + else if ((lString = aLeft->stringValuePointer())) {
1.97 + if ((rString = aRight->stringValuePointer())) {
1.98 + result = lString->Equals(*rString);
1.99 + }
1.100 + else {
1.101 + nsAutoString rStr;
1.102 + aRight->stringValue(rStr);
1.103 + result = lString->Equals(rStr);
1.104 + }
1.105 + }
1.106 + else if ((rString = aRight->stringValuePointer())) {
1.107 + nsAutoString lStr;
1.108 + aLeft->stringValue(lStr);
1.109 + result = rString->Equals(lStr);
1.110 + }
1.111 + else {
1.112 + nsAutoString lStr, rStr;
1.113 + aLeft->stringValue(lStr);
1.114 + aRight->stringValue(rStr);
1.115 + result = lStr.Equals(rStr);
1.116 + }
1.117 +
1.118 + return mOp == EQUAL ? result : !result;
1.119 + }
1.120 +
1.121 + double leftDbl = aLeft->numberValue();
1.122 + double rightDbl = aRight->numberValue();
1.123 + switch (mOp) {
1.124 + case LESS_THAN:
1.125 + {
1.126 + return (leftDbl < rightDbl);
1.127 + }
1.128 + case LESS_OR_EQUAL:
1.129 + {
1.130 + return (leftDbl <= rightDbl);
1.131 + }
1.132 + case GREATER_THAN:
1.133 + {
1.134 + return (leftDbl > rightDbl);
1.135 + }
1.136 + case GREATER_OR_EQUAL:
1.137 + {
1.138 + return (leftDbl >= rightDbl);
1.139 + }
1.140 + default:
1.141 + {
1.142 + NS_NOTREACHED("We should have caught all cases");
1.143 + }
1.144 + }
1.145 +
1.146 + return false;
1.147 +}
1.148 +
1.149 +nsresult
1.150 +RelationalExpr::evaluate(txIEvalContext* aContext, txAExprResult** aResult)
1.151 +{
1.152 + *aResult = nullptr;
1.153 + nsRefPtr<txAExprResult> lResult;
1.154 + nsresult rv = mLeftExpr->evaluate(aContext, getter_AddRefs(lResult));
1.155 + NS_ENSURE_SUCCESS(rv, rv);
1.156 +
1.157 + nsRefPtr<txAExprResult> rResult;
1.158 + rv = mRightExpr->evaluate(aContext, getter_AddRefs(rResult));
1.159 + NS_ENSURE_SUCCESS(rv, rv);
1.160 +
1.161 + aContext->recycler()->
1.162 + getBoolResult(compareResults(aContext, lResult, rResult), aResult);
1.163 +
1.164 + return NS_OK;
1.165 +}
1.166 +
1.167 +TX_IMPL_EXPR_STUBS_2(RelationalExpr, BOOLEAN_RESULT, mLeftExpr, mRightExpr)
1.168 +
1.169 +bool
1.170 +RelationalExpr::isSensitiveTo(ContextSensitivity aContext)
1.171 +{
1.172 + return mLeftExpr->isSensitiveTo(aContext) ||
1.173 + mRightExpr->isSensitiveTo(aContext);
1.174 +}
1.175 +
1.176 +#ifdef TX_TO_STRING
1.177 +void
1.178 +RelationalExpr::toString(nsAString& str)
1.179 +{
1.180 + mLeftExpr->toString(str);
1.181 +
1.182 + switch (mOp) {
1.183 + case NOT_EQUAL:
1.184 + str.AppendLiteral("!=");
1.185 + break;
1.186 + case LESS_THAN:
1.187 + str.Append(char16_t('<'));
1.188 + break;
1.189 + case LESS_OR_EQUAL:
1.190 + str.AppendLiteral("<=");
1.191 + break;
1.192 + case GREATER_THAN :
1.193 + str.Append(char16_t('>'));
1.194 + break;
1.195 + case GREATER_OR_EQUAL:
1.196 + str.AppendLiteral(">=");
1.197 + break;
1.198 + default:
1.199 + str.Append(char16_t('='));
1.200 + break;
1.201 + }
1.202 +
1.203 + mRightExpr->toString(str);
1.204 +}
1.205 +#endif
