1 files changed, 167 insertions, 0 deletions
diff --git a/editor/libeditor/DeleteNodeTransaction.cpp b/editor/libeditor/DeleteNodeTransaction.cpp
new file mode 100644
index 0000000000..31d5335b9b
--- /dev/null
+++ b/editor/libeditor/DeleteNodeTransaction.cpp
@@ -0,0 +1,167 @@
+/* -*- 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 "DeleteNodeTransaction.h"
+
+#include "EditorBase.h"
+#include "EditorDOMPoint.h"
+#include "HTMLEditUtils.h"
+#include "SelectionState.h"  // RangeUpdater
+#include "TextEditor.h"
+
+#include "mozilla/Logging.h"
+#include "mozilla/ToString.h"
+
+#include "nsDebug.h"
+#include "nsError.h"
+#include "nsAString.h"
+
+namespace mozilla {
+
+// static
+already_AddRefed<DeleteNodeTransaction> DeleteNodeTransaction::MaybeCreate(
+    EditorBase& aEditorBase, nsIContent& aContentToDelete) {
+  RefPtr<DeleteNodeTransaction> transaction =
+      new DeleteNodeTransaction(aEditorBase, aContentToDelete);
+  if (NS_WARN_IF(!transaction->CanDoIt())) {
+    return nullptr;
+  }
+  return transaction.forget();
+}
+
+DeleteNodeTransaction::DeleteNodeTransaction(EditorBase& aEditorBase,
+                                             nsIContent& aContentToDelete)
+    : DeleteContentTransactionBase(aEditorBase),
+      mContentToDelete(&aContentToDelete),
+      mParentNode(aContentToDelete.GetParentNode()) {
+  MOZ_DIAGNOSTIC_ASSERT_IF(
+      aEditorBase.IsHTMLEditor(),
+      HTMLEditUtils::IsRemovableNode(aContentToDelete) ||
+          // It's okay to delete text node if it's added by `HTMLEditor` since
+          // remaining it may be noisy for the users.
+          (aContentToDelete.IsText() &&
+           aContentToDelete.HasFlag(NS_MAYBE_MODIFIED_FREQUENTLY)));
+  NS_ASSERTION(
+      !aEditorBase.IsHTMLEditor() ||
+          HTMLEditUtils::IsRemovableNode(aContentToDelete),
+      "Deleting non-editable text node, please write a test for this!!");
+}
+
+std::ostream& operator<<(std::ostream& aStream,
+                         const DeleteNodeTransaction& aTransaction) {
+  aStream << "{ mContentToDelete=" << aTransaction.mContentToDelete.get();
+  if (aTransaction.mContentToDelete) {
+    aStream << " (" << *aTransaction.mContentToDelete << ")";
+  }
+  aStream << ", mParentNode=" << aTransaction.mParentNode.get();
+  if (aTransaction.mParentNode) {
+    aStream << " (" << *aTransaction.mParentNode << ")";
+  }
+  aStream << ", mRefContent=" << aTransaction.mRefContent.get();
+  if (aTransaction.mRefContent) {
+    aStream << " (" << *aTransaction.mRefContent << ")";
+  }
+  aStream << ", mEditorBase=" << aTransaction.mEditorBase.get() << " }";
+  return aStream;
+}
+
+NS_IMPL_CYCLE_COLLECTION_INHERITED(DeleteNodeTransaction,
+                                   DeleteContentTransactionBase,
+                                   mContentToDelete, mParentNode, mRefContent)
+
+NS_IMPL_ADDREF_INHERITED(DeleteNodeTransaction, DeleteContentTransactionBase)
+NS_IMPL_RELEASE_INHERITED(DeleteNodeTransaction, DeleteContentTransactionBase)
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(DeleteNodeTransaction)
+NS_INTERFACE_MAP_END_INHERITING(DeleteContentTransactionBase)
+
+bool DeleteNodeTransaction::CanDoIt() const {
+  if (NS_WARN_IF(!mContentToDelete) || NS_WARN_IF(!mEditorBase) ||
+      !mParentNode) {
+    return false;
+  }
+  return mEditorBase->IsTextEditor() ||
+         HTMLEditUtils::IsSimplyEditableNode(*mParentNode);
+}
+
+NS_IMETHODIMP DeleteNodeTransaction::DoTransaction() {
+  MOZ_LOG(GetLogModule(), LogLevel::Info,
+          ("%p DeleteNodeTransaction::%s this=%s", this, __FUNCTION__,
+           ToString(*this).c_str()));
+
+  if (NS_WARN_IF(!CanDoIt())) {
+    return NS_OK;
+  }
+
+  MOZ_ASSERT_IF(mEditorBase->IsTextEditor(), !mContentToDelete->IsText());
+
+  // Remember which child mContentToDelete was (by remembering which child was
+  // next).  Note that mRefContent can be nullptr.
+  mRefContent = mContentToDelete->GetNextSibling();
+
+  // give range updater a chance.  SelAdjDeleteNode() needs to be called
+  // *before* we do the action, unlike some of the other RangeItem update
+  // methods.
+  mEditorBase->RangeUpdaterRef().SelAdjDeleteNode(*mContentToDelete);
+
+  OwningNonNull<nsINode> parentNode = *mParentNode;
+  OwningNonNull<nsIContent> contentToDelete = *mContentToDelete;
+  ErrorResult error;
+  parentNode->RemoveChild(contentToDelete, error);
+  NS_WARNING_ASSERTION(!error.Failed(), "nsINode::RemoveChild() failed");
+  return error.StealNSResult();
+}
+
+EditorDOMPoint DeleteNodeTransaction::SuggestPointToPutCaret() const {
+  return EditorDOMPoint();
+}
+
+NS_IMETHODIMP DeleteNodeTransaction::UndoTransaction() {
+  MOZ_LOG(GetLogModule(), LogLevel::Info,
+          ("%p DeleteNodeTransaction::%s this=%s", this, __FUNCTION__,
+           ToString(*this).c_str()));
+
+  if (NS_WARN_IF(!CanDoIt())) {
+    // This is a legal state, the transaction is a no-op.
+    return NS_OK;
+  }
+  ErrorResult error;
+  OwningNonNull<EditorBase> editorBase = *mEditorBase;
+  OwningNonNull<nsINode> parentNode = *mParentNode;
+  OwningNonNull<nsIContent> contentToDelete = *mContentToDelete;
+  nsCOMPtr<nsIContent> refContent = mRefContent;
+  // XXX Perhaps, we should check `refContent` is a child of `parentNode`,
+  //     and if it's not, we should stop undoing or something.
+  parentNode->InsertBefore(contentToDelete, refContent, error);
+  // InsertBefore() may call MightThrowJSException() even if there is no error.
+  // We don't need the flag here.
+  error.WouldReportJSException();
+  if (error.Failed()) {
+    NS_WARNING("nsINode::InsertBefore() failed");
+    return error.StealNSResult();
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP DeleteNodeTransaction::RedoTransaction() {
+  MOZ_LOG(GetLogModule(), LogLevel::Info,
+          ("%p DeleteNodeTransaction::%s this=%s", this, __FUNCTION__,
+           ToString(*this).c_str()));
+
+  if (NS_WARN_IF(!CanDoIt())) {
+    // This is a legal state, the transaction is a no-op.
+    return NS_OK;
+  }
+
+  mEditorBase->RangeUpdaterRef().SelAdjDeleteNode(*mContentToDelete);
+
+  OwningNonNull<nsINode> parentNode = *mParentNode;
+  OwningNonNull<nsIContent> contentToDelete = *mContentToDelete;
+  ErrorResult error;
+  parentNode->RemoveChild(contentToDelete, error);
+  NS_WARNING_ASSERTION(!error.Failed(), "nsINode::RemoveChild() failed");
+  return error.StealNSResult();
+}
+
+}  // namespace mozilla