1 files changed, 185 insertions, 0 deletions
diff --git a/editor/libeditor/JoinNodesTransaction.cpp b/editor/libeditor/JoinNodesTransaction.cpp
new file mode 100644
index 0000000000..094a41a5c9
--- /dev/null
+++ b/editor/libeditor/JoinNodesTransaction.cpp
@@ -0,0 +1,185 @@
+/* -*- 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 "JoinNodesTransaction.h"
+
+#include "EditorDOMPoint.h"   // for EditorDOMPoint, etc.
+#include "HTMLEditHelpers.h"  // for SplitNodeResult
+#include "HTMLEditor.h"       // for HTMLEditor
+#include "HTMLEditorInlines.h"
+#include "HTMLEditUtils.h"
+
+#include "mozilla/Logging.h"
+#include "mozilla/ToString.h"
+#include "mozilla/dom/Text.h"
+
+#include "nsAString.h"
+#include "nsDebug.h"          // for NS_ASSERTION, etc.
+#include "nsError.h"          // for NS_ERROR_NULL_POINTER, etc.
+#include "nsIContent.h"       // for nsIContent
+#include "nsISupportsImpl.h"  // for QueryInterface, etc.
+
+namespace mozilla {
+
+using namespace dom;
+
+// static
+already_AddRefed<JoinNodesTransaction> JoinNodesTransaction::MaybeCreate(
+    HTMLEditor& aHTMLEditor, nsIContent& aLeftContent,
+    nsIContent& aRightContent) {
+  RefPtr<JoinNodesTransaction> transaction =
+      new JoinNodesTransaction(aHTMLEditor, aLeftContent, aRightContent);
+  if (NS_WARN_IF(!transaction->CanDoIt())) {
+    return nullptr;
+  }
+  return transaction.forget();
+}
+
+JoinNodesTransaction::JoinNodesTransaction(HTMLEditor& aHTMLEditor,
+                                           nsIContent& aLeftContent,
+                                           nsIContent& aRightContent)
+    : mHTMLEditor(&aHTMLEditor),
+      mRemovedContent(&aRightContent),
+      mKeepingContent(&aLeftContent) {
+  // printf("JoinNodesTransaction size: %zu\n", sizeof(JoinNodesTransaction));
+  static_assert(sizeof(JoinNodesTransaction) <= 64,
+                "Transaction classes may be created a lot and may be alive "
+                "long so that keep the foot print smaller as far as possible");
+}
+
+std::ostream& operator<<(std::ostream& aStream,
+                         const JoinNodesTransaction& aTransaction) {
+  aStream << "{ mParentNode=" << aTransaction.mParentNode.get();
+  if (aTransaction.mParentNode) {
+    aStream << " (" << *aTransaction.mParentNode << ")";
+  }
+  aStream << ", mRemovedContent=" << aTransaction.mRemovedContent.get();
+  if (aTransaction.mRemovedContent) {
+    aStream << " (" << *aTransaction.mRemovedContent << ")";
+  }
+  aStream << ", mKeepingContent=" << aTransaction.mKeepingContent.get();
+  if (aTransaction.mKeepingContent) {
+    aStream << " (" << *aTransaction.mKeepingContent << ")";
+  }
+  aStream << ", mJoinedOffset=" << aTransaction.mJoinedOffset
+          << ", mHTMLEditor=" << aTransaction.mHTMLEditor.get() << " }";
+  return aStream;
+}
+
+NS_IMPL_CYCLE_COLLECTION_INHERITED(JoinNodesTransaction, EditTransactionBase,
+                                   mHTMLEditor, mParentNode, mRemovedContent,
+                                   mKeepingContent)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(JoinNodesTransaction)
+NS_INTERFACE_MAP_END_INHERITING(EditTransactionBase)
+
+bool JoinNodesTransaction::CanDoIt() const {
+  if (NS_WARN_IF(!mKeepingContent) || NS_WARN_IF(!mRemovedContent) ||
+      NS_WARN_IF(!mHTMLEditor) ||
+      NS_WARN_IF(mRemovedContent->IsBeingRemoved()) ||
+      !mKeepingContent->IsInComposedDoc()) {
+    return false;
+  }
+  return HTMLEditUtils::IsRemovableFromParentNode(*mRemovedContent);
+}
+
+// After DoTransaction() and RedoTransaction(), the left node is removed from
+// the content tree and right node remains.
+NS_IMETHODIMP JoinNodesTransaction::DoTransaction() {
+  MOZ_LOG(GetLogModule(), LogLevel::Info,
+          ("%p JoinNodesTransaction::%s this=%s", this, __FUNCTION__,
+           ToString(*this).c_str()));
+
+  return DoTransactionInternal(RedoingTransaction::No);
+}
+
+nsresult JoinNodesTransaction::DoTransactionInternal(
+    RedoingTransaction aRedoingTransaction) {
+  if (MOZ_UNLIKELY(NS_WARN_IF(!mHTMLEditor) || NS_WARN_IF(!mKeepingContent) ||
+                   NS_WARN_IF(!mRemovedContent) ||
+                   NS_WARN_IF(mRemovedContent->IsBeingRemoved()))) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  nsINode* removingContentParentNode = mRemovedContent->GetParentNode();
+  if (MOZ_UNLIKELY(NS_WARN_IF(!removingContentParentNode))) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  // Verify that the joining content nodes have the same parent
+  if (MOZ_UNLIKELY(removingContentParentNode !=
+                   mKeepingContent->GetParentNode())) {
+    NS_ASSERTION(false, "Nodes do not have same parent");
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  // Set this instance's mParentNode.  Other methods will see a non-null
+  // mParentNode and know all is well
+  mParentNode = removingContentParentNode;
+  // For now, setting mJoinedOffset to removed content length so that
+  // CreateJoinedPoint returns a point in mKeepingContent whose offset is
+  // the result if all content in mRemovedContent are moved to start or end of
+  // mKeepingContent without any intervention.  The offset will be adjusted
+  // below.
+  mJoinedOffset = mKeepingContent->Length();
+
+  const OwningNonNull<HTMLEditor> htmlEditor = *mHTMLEditor;
+  const OwningNonNull<nsIContent> removingContent = *mRemovedContent;
+  const OwningNonNull<nsIContent> keepingContent = *mKeepingContent;
+  nsresult rv;
+  // Let's try to get actual joined point with the tacker.
+  auto joinNodesPoint = EditorDOMPoint::AtEndOf(keepingContent);
+  {
+    AutoTrackDOMPoint trackJoinNodePoint(htmlEditor->RangeUpdaterRef(),
+                                         &joinNodesPoint);
+    rv = htmlEditor->DoJoinNodes(keepingContent, removingContent);
+    NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "HTMLEditor::DoJoinNodes() failed");
+  }
+  // Adjust join node offset to the actual offset where the original first
+  // content of the right node is.
+  mJoinedOffset = joinNodesPoint.Offset();
+
+  if (aRedoingTransaction == RedoingTransaction::No) {
+    htmlEditor->DidJoinNodesTransaction(*this, rv);
+  }
+
+  return rv;
+}
+
+// XXX: What if instead of split, we just deleted the unneeded children of
+//     mRight and re-inserted mLeft?
+NS_IMETHODIMP JoinNodesTransaction::UndoTransaction() {
+  MOZ_LOG(GetLogModule(), LogLevel::Info,
+          ("%p JoinNodesTransaction::%s this=%s", this, __FUNCTION__,
+           ToString(*this).c_str()));
+
+  if (NS_WARN_IF(!mParentNode) || NS_WARN_IF(!mKeepingContent) ||
+      NS_WARN_IF(!mRemovedContent) || NS_WARN_IF(!mHTMLEditor)) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  const OwningNonNull<HTMLEditor> htmlEditor = *mHTMLEditor;
+  const OwningNonNull<nsIContent> removedContent = *mRemovedContent;
+
+  Result<SplitNodeResult, nsresult> splitNodeResult = htmlEditor->DoSplitNode(
+      CreateJoinedPoint<EditorDOMPoint>(), removedContent);
+  if (MOZ_UNLIKELY(splitNodeResult.isErr())) {
+    NS_WARNING("HTMLEditor::DoSplitNode() failed");
+    return splitNodeResult.unwrapErr();
+  }
+  // When adding caret suggestion to SplitNodeResult, here didn't change
+  // selection so that just ignore it.
+  splitNodeResult.inspect().IgnoreCaretPointSuggestion();
+  return NS_OK;
+}
+
+NS_IMETHODIMP JoinNodesTransaction::RedoTransaction() {
+  MOZ_LOG(GetLogModule(), LogLevel::Info,
+          ("%p JoinNodesTransaction::%s this=%s", this, __FUNCTION__,
+           ToString(*this).c_str()));
+  return DoTransactionInternal(RedoingTransaction::Yes);
+}
+
+}  // namespace mozilla