1 files changed, 78 insertions, 0 deletions
diff --git a/dom/xslt/xpath/txPredicateList.cpp b/dom/xslt/xpath/txPredicateList.cpp
new file mode 100644
index 0000000000..ad2804caef
--- /dev/null
+++ b/dom/xslt/xpath/txPredicateList.cpp
@@ -0,0 +1,78 @@
+/* -*- 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 "txNodeSetContext.h"
+
+/*
+ * Represents an ordered list of Predicates,
+ * for use with Step and Filter Expressions
+ */
+
+nsresult PredicateList::evaluatePredicates(txNodeSet* nodes,
+                                           txIMatchContext* aContext) {
+  NS_ASSERTION(nodes, "called evaluatePredicates with nullptr NodeSet");
+  nsresult rv = NS_OK;
+
+  uint32_t i, len = mPredicates.Length();
+  for (i = 0; i < len && !nodes->isEmpty(); ++i) {
+    txNodeSetContext predContext(nodes, aContext);
+    /*
+     * add nodes to newNodes that match the expression
+     * or, if the result is a number, add the node with the right
+     * position
+     */
+    int32_t index = 0;
+    while (predContext.hasNext()) {
+      predContext.next();
+      RefPtr<txAExprResult> exprResult;
+      rv = mPredicates[i]->evaluate(&predContext, getter_AddRefs(exprResult));
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      // handle default, [position() == numberValue()]
+      if (exprResult->getResultType() == txAExprResult::NUMBER) {
+        if ((double)predContext.position() == exprResult->numberValue()) {
+          nodes->mark(index);
+        }
+      } else if (exprResult->booleanValue()) {
+        nodes->mark(index);
+      }
+      ++index;
+    }
+    // sweep the non-marked nodes
+    nodes->sweep();
+  }
+
+  return NS_OK;
+}
+
+bool PredicateList::isSensitiveTo(Expr::ContextSensitivity aContext) {
+  // We're creating a new node/nodeset so we can ignore those bits.
+  Expr::ContextSensitivity context =
+      aContext & ~(Expr::NODE_CONTEXT | Expr::NODESET_CONTEXT);
+  if (context == Expr::NO_CONTEXT) {
+    return false;
+  }
+
+  uint32_t i, len = mPredicates.Length();
+  for (i = 0; i < len; ++i) {
+    if (mPredicates[i]->isSensitiveTo(context)) {
+      return true;
+    }
+  }
+
+  return false;
+}
+
+#ifdef TX_TO_STRING
+void PredicateList::toString(nsAString& dest) {
+  for (uint32_t i = 0; i < mPredicates.Length(); ++i) {
+    dest.Append(char16_t('['));
+    mPredicates[i]->toString(dest);
+    dest.Append(char16_t(']'));
+  }
+}
+#endif