summaryrefslogtreecommitdiffstats
path: root/dom/xslt/xpath/txRelationalExpr.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'dom/xslt/xpath/txRelationalExpr.cpp')
-rw-r--r--dom/xslt/xpath/txRelationalExpr.cpp202
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