1 files changed, 85 insertions, 0 deletions
diff --git a/docshell/base/nsDocShellEnumerator.cpp b/docshell/base/nsDocShellEnumerator.cpp
new file mode 100644
index 0000000000..5ad0ad35e6
--- /dev/null
+++ b/docshell/base/nsDocShellEnumerator.cpp
@@ -0,0 +1,85 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 "nsDocShellEnumerator.h"
+
+#include "nsDocShell.h"
+
+using namespace mozilla;
+
+nsDocShellEnumerator::nsDocShellEnumerator(
+    nsDocShellEnumerator::EnumerationDirection aDirection,
+    int32_t aDocShellType, nsDocShell& aRootItem)
+    : mRootItem(&aRootItem),
+      mDocShellType(aDocShellType),
+      mDirection(aDirection) {}
+
+nsresult nsDocShellEnumerator::BuildDocShellArray(
+    nsTArray<RefPtr<nsIDocShell>>& aItemArray) {
+  MOZ_ASSERT(mRootItem);
+
+  aItemArray.Clear();
+
+  if (mDirection == EnumerationDirection::Forwards) {
+    return BuildArrayRecursiveForwards(mRootItem, aItemArray);
+  }
+  MOZ_ASSERT(mDirection == EnumerationDirection::Backwards);
+  return BuildArrayRecursiveBackwards(mRootItem, aItemArray);
+}
+
+nsresult nsDocShellEnumerator::BuildArrayRecursiveForwards(
+    nsDocShell* aItem, nsTArray<RefPtr<nsIDocShell>>& aItemArray) {
+  nsresult rv;
+
+  // add this item to the array
+  if (mDocShellType == nsIDocShellTreeItem::typeAll ||
+      aItem->ItemType() == mDocShellType) {
+    if (!aItemArray.AppendElement(aItem, fallible)) {
+      return NS_ERROR_OUT_OF_MEMORY;
+    }
+  }
+
+  int32_t numChildren = aItem->ChildCount();
+
+  for (int32_t i = 0; i < numChildren; ++i) {
+    RefPtr<nsDocShell> curChild = aItem->GetInProcessChildAt(i);
+    MOZ_ASSERT(curChild);
+
+    rv = BuildArrayRecursiveForwards(curChild, aItemArray);
+    if (NS_FAILED(rv)) {
+      return rv;
+    }
+  }
+
+  return NS_OK;
+}
+
+nsresult nsDocShellEnumerator::BuildArrayRecursiveBackwards(
+    nsDocShell* aItem, nsTArray<RefPtr<nsIDocShell>>& aItemArray) {
+  nsresult rv;
+
+  uint32_t numChildren = aItem->ChildCount();
+
+  for (int32_t i = numChildren - 1; i >= 0; --i) {
+    RefPtr<nsDocShell> curChild = aItem->GetInProcessChildAt(i);
+    MOZ_ASSERT(curChild);
+
+    rv = BuildArrayRecursiveBackwards(curChild, aItemArray);
+    if (NS_FAILED(rv)) {
+      return rv;
+    }
+  }
+
+  // add this item to the array
+  if (mDocShellType == nsIDocShellTreeItem::typeAll ||
+      aItem->ItemType() == mDocShellType) {
+    if (!aItemArray.AppendElement(aItem, fallible)) {
+      return NS_ERROR_OUT_OF_MEMORY;
+    }
+  }
+
+  return NS_OK;
+}