1 files changed, 74 insertions, 0 deletions
diff --git a/editor/txmgr/TransactionStack.cpp b/editor/txmgr/TransactionStack.cpp
new file mode 100644
index 0000000000..099b46a77c
--- /dev/null
+++ b/editor/txmgr/TransactionStack.cpp
@@ -0,0 +1,74 @@
+/* -*- Mode: C++; tab-width: 2; 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 "TransactionStack.h"
+
+#include "nsCycleCollectionParticipant.h"
+#include "nsDebug.h"
+#include "nsISupportsUtils.h"
+#include "nscore.h"
+#include "TransactionItem.h"
+
+namespace mozilla {
+
+TransactionStack::TransactionStack(Type aType) : mType(aType) {}
+
+TransactionStack::~TransactionStack() { Clear(); }
+
+void TransactionStack::Push(TransactionItem* aTransactionItem) {
+  if (NS_WARN_IF(!aTransactionItem)) {
+    return;
+  }
+  nsRefPtrDeque<TransactionItem>::Push(aTransactionItem);
+}
+
+void TransactionStack::Push(
+    already_AddRefed<TransactionItem> aTransactionItem) {
+  TransactionItem* transactionItem = aTransactionItem.take();
+  if (NS_WARN_IF(!transactionItem)) {
+    return;
+  }
+  nsRefPtrDeque<TransactionItem>::Push(dont_AddRef(transactionItem));
+}
+
+already_AddRefed<TransactionItem> TransactionStack::Pop() {
+  return nsRefPtrDeque<TransactionItem>::Pop();
+}
+
+already_AddRefed<TransactionItem> TransactionStack::PopBottom() {
+  return nsRefPtrDeque<TransactionItem>::PopFront();
+}
+
+already_AddRefed<TransactionItem> TransactionStack::Peek() const {
+  RefPtr<TransactionItem> item = nsRefPtrDeque<TransactionItem>::Peek();
+  return item.forget();
+}
+
+already_AddRefed<TransactionItem> TransactionStack::GetItemAt(
+    size_t aIndex) const {
+  RefPtr<TransactionItem> item =
+      nsRefPtrDeque<TransactionItem>::ObjectAt(aIndex);
+  return item.forget();
+}
+
+void TransactionStack::Clear() {
+  while (GetSize()) {
+    RefPtr<TransactionItem> item = mType == FOR_UNDO ? Pop() : PopBottom();
+  }
+}
+
+void TransactionStack::DoTraverse(nsCycleCollectionTraversalCallback& cb) {
+  size_t size = GetSize();
+  for (size_t i = 0; i < size; ++i) {
+    auto* item = nsRefPtrDeque<TransactionItem>::ObjectAt(i);
+    if (item) {
+      NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "transaction stack mDeque[i]");
+      cb.NoteNativeChild(item,
+                         NS_CYCLE_COLLECTION_PARTICIPANT(TransactionItem));
+    }
+  }
+}
+
+}  // namespace mozilla