1 files changed, 88 insertions, 0 deletions
diff --git a/dom/xslt/xpath/txFilterExpr.cpp b/dom/xslt/xpath/txFilterExpr.cpp
new file mode 100644
index 0000000000..f632683290
--- /dev/null
+++ b/dom/xslt/xpath/txFilterExpr.cpp
@@ -0,0 +1,88 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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"
+
+using mozilla::Unused;
+using mozilla::WrapUnique;
+
+//-- Implementation of FilterExpr --/
+
+//-----------------------------/
+//- Virtual methods from Expr -/
+//-----------------------------/
+
+/**
+ * Evaluates this Expr based on the given context node and processor state
+ * @param context the context node for evaluation of this Expr
+ * @param ps the ProcessorState containing the stack information needed
+ * for evaluation
+ * @return the result of the evaluation
+ * @see Expr
+ **/
+nsresult FilterExpr::evaluate(txIEvalContext* aContext,
+                              txAExprResult** aResult) {
+  *aResult = nullptr;
+
+  RefPtr<txAExprResult> exprRes;
+  nsresult rv = expr->evaluate(aContext, getter_AddRefs(exprRes));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  NS_ENSURE_TRUE(exprRes->getResultType() == txAExprResult::NODESET,
+                 NS_ERROR_XSLT_NODESET_EXPECTED);
+
+  RefPtr<txNodeSet> nodes =
+      static_cast<txNodeSet*>(static_cast<txAExprResult*>(exprRes));
+  // null out exprRes so that we can test for shared-ness
+  exprRes = nullptr;
+
+  RefPtr<txNodeSet> nonShared;
+  rv = aContext->recycler()->getNonSharedNodeSet(nodes,
+                                                 getter_AddRefs(nonShared));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = evaluatePredicates(nonShared, aContext);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  *aResult = nonShared;
+  NS_ADDREF(*aResult);
+
+  return NS_OK;
+}  //-- evaluate
+
+TX_IMPL_EXPR_STUBS_BASE(FilterExpr, NODESET_RESULT)
+
+Expr* FilterExpr::getSubExprAt(uint32_t aPos) {
+  if (aPos == 0) {
+    return expr.get();
+  }
+  return PredicateList::getSubExprAt(aPos - 1);
+}
+
+void FilterExpr::setSubExprAt(uint32_t aPos, Expr* aExpr) {
+  if (aPos == 0) {
+    Unused << expr.release();
+    expr = WrapUnique(aExpr);
+  } else {
+    PredicateList::setSubExprAt(aPos - 1, aExpr);
+  }
+}
+
+bool FilterExpr::isSensitiveTo(ContextSensitivity aContext) {
+  return expr->isSensitiveTo(aContext) ||
+         PredicateList::isSensitiveTo(aContext);
+}
+
+#ifdef TX_TO_STRING
+void FilterExpr::toString(nsAString& str) {
+  if (expr)
+    expr->toString(str);
+  else
+    str.AppendLiteral("null");
+  PredicateList::toString(str);
+}
+#endif