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Diffstat (limited to 'dom/xslt/xpath/txRelationalExpr.cpp')
| -rw-r--r-- | dom/xslt/xpath/txRelationalExpr.cpp | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/dom/xslt/xpath/txRelationalExpr.cpp b/dom/xslt/xpath/txRelationalExpr.cpp new file mode 100644 index 000000000..5621ede7b --- /dev/null +++ b/dom/xslt/xpath/txRelationalExpr.cpp @@ -0,0 +1,202 @@ +/* -*- 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 "txNodeSet.h" +#include "txIXPathContext.h" +#include "txXPathTreeWalker.h" + +/** + * Compares the two ExprResults based on XPath 1.0 Recommendation (section 3.4) + */ +bool +RelationalExpr::compareResults(txIEvalContext* aContext, txAExprResult* aLeft, + txAExprResult* aRight) +{ + short ltype = aLeft->getResultType(); + short rtype = aRight->getResultType(); + nsresult rv = NS_OK; + + // Handle case for just Left NodeSet or Both NodeSets + if (ltype == txAExprResult::NODESET) { + if (rtype == txAExprResult::BOOLEAN) { + BooleanResult leftBool(aLeft->booleanValue()); + return compareResults(aContext, &leftBool, aRight); + } + + txNodeSet* nodeSet = static_cast<txNodeSet*>(aLeft); + RefPtr<StringResult> strResult; + rv = aContext->recycler()->getStringResult(getter_AddRefs(strResult)); + NS_ENSURE_SUCCESS(rv, false); + + int32_t i; + for (i = 0; i < nodeSet->size(); ++i) { + strResult->mValue.Truncate(); + txXPathNodeUtils::appendNodeValue(nodeSet->get(i), + strResult->mValue); + if (compareResults(aContext, strResult, aRight)) { + return true; + } + } + + return false; + } + + // Handle case for Just Right NodeSet + if (rtype == txAExprResult::NODESET) { + if (ltype == txAExprResult::BOOLEAN) { + BooleanResult rightBool(aRight->booleanValue()); + return compareResults(aContext, aLeft, &rightBool); + } + + txNodeSet* nodeSet = static_cast<txNodeSet*>(aRight); + RefPtr<StringResult> strResult; + rv = aContext->recycler()->getStringResult(getter_AddRefs(strResult)); + NS_ENSURE_SUCCESS(rv, false); + + int32_t i; + for (i = 0; i < nodeSet->size(); ++i) { + strResult->mValue.Truncate(); + txXPathNodeUtils::appendNodeValue(nodeSet->get(i), + strResult->mValue); + if (compareResults(aContext, aLeft, strResult)) { + return true; + } + } + + return false; + } + + // Neither is a NodeSet + if (mOp == EQUAL || mOp == NOT_EQUAL) { + bool result; + const nsString *lString, *rString; + + // If either is a bool, compare as bools. + if (ltype == txAExprResult::BOOLEAN || + rtype == txAExprResult::BOOLEAN) { + result = aLeft->booleanValue() == aRight->booleanValue(); + } + + // If either is a number, compare as numbers. + else if (ltype == txAExprResult::NUMBER || + rtype == txAExprResult::NUMBER) { + double lval = aLeft->numberValue(); + double rval = aRight->numberValue(); + result = (lval == rval); + } + + // Otherwise compare as strings. Try to use the stringobject in + // StringResult if possible since that is a common case. + else if ((lString = aLeft->stringValuePointer())) { + if ((rString = aRight->stringValuePointer())) { + result = lString->Equals(*rString); + } + else { + nsAutoString rStr; + aRight->stringValue(rStr); + result = lString->Equals(rStr); + } + } + else if ((rString = aRight->stringValuePointer())) { + nsAutoString lStr; + aLeft->stringValue(lStr); + result = rString->Equals(lStr); + } + else { + nsAutoString lStr, rStr; + aLeft->stringValue(lStr); + aRight->stringValue(rStr); + result = lStr.Equals(rStr); + } + + return mOp == EQUAL ? result : !result; + } + + double leftDbl = aLeft->numberValue(); + double rightDbl = aRight->numberValue(); + switch (mOp) { + case LESS_THAN: + { + return (leftDbl < rightDbl); + } + case LESS_OR_EQUAL: + { + return (leftDbl <= rightDbl); + } + case GREATER_THAN: + { + return (leftDbl > rightDbl); + } + case GREATER_OR_EQUAL: + { + return (leftDbl >= rightDbl); + } + default: + { + NS_NOTREACHED("We should have caught all cases"); + } + } + + return false; +} + +nsresult +RelationalExpr::evaluate(txIEvalContext* aContext, txAExprResult** aResult) +{ + *aResult = nullptr; + RefPtr<txAExprResult> lResult; + nsresult rv = mLeftExpr->evaluate(aContext, getter_AddRefs(lResult)); + NS_ENSURE_SUCCESS(rv, rv); + + RefPtr<txAExprResult> rResult; + rv = mRightExpr->evaluate(aContext, getter_AddRefs(rResult)); + NS_ENSURE_SUCCESS(rv, rv); + + aContext->recycler()-> + getBoolResult(compareResults(aContext, lResult, rResult), aResult); + + return NS_OK; +} + +TX_IMPL_EXPR_STUBS_2(RelationalExpr, BOOLEAN_RESULT, mLeftExpr, mRightExpr) + +bool +RelationalExpr::isSensitiveTo(ContextSensitivity aContext) +{ + return mLeftExpr->isSensitiveTo(aContext) || + mRightExpr->isSensitiveTo(aContext); +} + +#ifdef TX_TO_STRING +void +RelationalExpr::toString(nsAString& str) +{ + mLeftExpr->toString(str); + + switch (mOp) { + case NOT_EQUAL: + str.AppendLiteral("!="); + break; + case LESS_THAN: + str.Append(char16_t('<')); + break; + case LESS_OR_EQUAL: + str.AppendLiteral("<="); + break; + case GREATER_THAN : + str.Append(char16_t('>')); + break; + case GREATER_OR_EQUAL: + str.AppendLiteral(">="); + break; + default: + str.Append(char16_t('=')); + break; + } + + mRightExpr->toString(str); +} +#endif |