1 files changed, 219 insertions, 0 deletions
diff --git a/editor/libeditor/SplitNodeTransaction.cpp b/editor/libeditor/SplitNodeTransaction.cpp
new file mode 100644
index 0000000000..01c61bd4d4
--- /dev/null
+++ b/editor/libeditor/SplitNodeTransaction.cpp
@@ -0,0 +1,219 @@
+/* -*- 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 "SplitNodeTransaction.h"
+
+#include "EditorDOMPoint.h"   // for EditorRawDOMPoint
+#include "HTMLEditHelpers.h"  // for SplitNodeResult
+#include "HTMLEditor.h"       // for HTMLEditor
+#include "HTMLEditorInlines.h"
+#include "HTMLEditUtils.h"
+#include "SelectionState.h"  // for AutoTrackDOMPoint and RangeUpdater
+
+#include "mozilla/Logging.h"
+#include "mozilla/Maybe.h"
+#include "mozilla/ToString.h"
+#include "nsAString.h"
+#include "nsDebug.h"     // for NS_ASSERTION, etc.
+#include "nsError.h"     // for NS_ERROR_NOT_INITIALIZED, etc.
+#include "nsIContent.h"  // for nsIContent
+
+namespace mozilla {
+
+using namespace dom;
+
+template already_AddRefed<SplitNodeTransaction> SplitNodeTransaction::Create(
+    HTMLEditor& aHTMLEditor, const EditorDOMPoint& aStartOfRightContent);
+template already_AddRefed<SplitNodeTransaction> SplitNodeTransaction::Create(
+    HTMLEditor& aHTMLEditor, const EditorRawDOMPoint& aStartOfRightContent);
+
+// static
+template <typename PT, typename CT>
+already_AddRefed<SplitNodeTransaction> SplitNodeTransaction::Create(
+    HTMLEditor& aHTMLEditor,
+    const EditorDOMPointBase<PT, CT>& aStartOfRightContent) {
+  RefPtr<SplitNodeTransaction> transaction =
+      new SplitNodeTransaction(aHTMLEditor, aStartOfRightContent);
+  return transaction.forget();
+}
+
+template <typename PT, typename CT>
+SplitNodeTransaction::SplitNodeTransaction(
+    HTMLEditor& aHTMLEditor,
+    const EditorDOMPointBase<PT, CT>& aStartOfRightContent)
+    : mHTMLEditor(&aHTMLEditor),
+      mSplitContent(aStartOfRightContent.template GetContainerAs<nsIContent>()),
+      mSplitOffset(aStartOfRightContent.Offset()) {
+  // printf("SplitNodeTransaction size: %zu\n", sizeof(SplitNodeTransaction));
+  static_assert(sizeof(SplitNodeTransaction) <= 64,
+                "Transaction classes may be created a lot and may be alive "
+                "long so that keep the foot print smaller as far as possible");
+  MOZ_DIAGNOSTIC_ASSERT(aStartOfRightContent.IsInContentNode());
+  MOZ_DIAGNOSTIC_ASSERT(HTMLEditUtils::IsSplittableNode(
+      *aStartOfRightContent.template ContainerAs<nsIContent>()));
+}
+
+std::ostream& operator<<(std::ostream& aStream,
+                         const SplitNodeTransaction& aTransaction) {
+  aStream << "{ mParentNode=" << aTransaction.mParentNode.get();
+  if (aTransaction.mParentNode) {
+    aStream << " (" << *aTransaction.mParentNode << ")";
+  }
+  aStream << ", mNewContent=" << aTransaction.mNewContent.get();
+  if (aTransaction.mNewContent) {
+    aStream << " (" << *aTransaction.mNewContent << ")";
+  }
+  aStream << ", mSplitContent=" << aTransaction.mSplitContent.get();
+  if (aTransaction.mSplitContent) {
+    aStream << " (" << *aTransaction.mSplitContent << ")";
+  }
+  aStream << ", mSplitOffset=" << aTransaction.mSplitOffset
+          << ", mHTMLEditor=" << aTransaction.mHTMLEditor.get() << " }";
+  return aStream;
+}
+
+NS_IMPL_CYCLE_COLLECTION_INHERITED(SplitNodeTransaction, EditTransactionBase,
+                                   mHTMLEditor, mParentNode, mSplitContent,
+                                   mNewContent)
+
+NS_IMPL_ADDREF_INHERITED(SplitNodeTransaction, EditTransactionBase)
+NS_IMPL_RELEASE_INHERITED(SplitNodeTransaction, EditTransactionBase)
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(SplitNodeTransaction)
+NS_INTERFACE_MAP_END_INHERITING(EditTransactionBase)
+
+NS_IMETHODIMP SplitNodeTransaction::DoTransaction() {
+  MOZ_LOG(GetLogModule(), LogLevel::Info,
+          ("%p SplitNodeTransaction::%s this=%s", this, __FUNCTION__,
+           ToString(*this).c_str()));
+
+  if (MOZ_UNLIKELY(NS_WARN_IF(!mHTMLEditor) || NS_WARN_IF(!mSplitContent))) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+  MOZ_ASSERT(mSplitOffset <= mSplitContent->Length());
+
+  // Create a new node
+  IgnoredErrorResult error;
+  // Don't use .downcast directly because AsContent has an assertion we want
+  nsCOMPtr<nsINode> newNode = mSplitContent->CloneNode(false, error);
+  if (MOZ_UNLIKELY(error.Failed())) {
+    NS_WARNING("nsINode::CloneNode() failed");
+    return error.StealNSResult();
+  }
+  if (MOZ_UNLIKELY(NS_WARN_IF(!newNode))) {
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  mNewContent = newNode->AsContent();
+  mParentNode = mSplitContent->GetParentNode();
+  if (!mParentNode) {
+    NS_WARNING("The splitting content was an orphan node");
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  const OwningNonNull<HTMLEditor> htmlEditor = *mHTMLEditor;
+  const OwningNonNull<nsIContent> splittingContent = *mSplitContent;
+  // MOZ_KnownLive(*mNewContent): it's grabbed by newNode
+  Result<SplitNodeResult, nsresult> splitNodeResult = DoTransactionInternal(
+      htmlEditor, splittingContent, MOZ_KnownLive(*mNewContent), mSplitOffset);
+  if (MOZ_UNLIKELY(splitNodeResult.isErr())) {
+    NS_WARNING("SplitNodeTransaction::DoTransactionInternal() failed");
+    return EditorBase::ToGenericNSResult(splitNodeResult.unwrapErr());
+  }
+  // The user should handle selection rather here.
+  splitNodeResult.inspect().IgnoreCaretPointSuggestion();
+  return NS_OK;
+}
+
+Result<SplitNodeResult, nsresult> SplitNodeTransaction::DoTransactionInternal(
+    HTMLEditor& aHTMLEditor, nsIContent& aSplittingContent,
+    nsIContent& aNewContent, uint32_t aSplitOffset) {
+  if (Element* const splittingElement = Element::FromNode(aSplittingContent)) {
+    // MOZ_KnownLive(*splittingElement): aSplittingContent should be grabbed by
+    // the callers.
+    nsresult rv =
+        aHTMLEditor.MarkElementDirty(MOZ_KnownLive(*splittingElement));
+    if (NS_WARN_IF(rv == NS_ERROR_EDITOR_DESTROYED)) {
+      return Err(NS_ERROR_EDITOR_DESTROYED);
+    }
+    NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
+                         "EditorBase::MarkElementDirty() failed, but ignored");
+  }
+
+  Result<SplitNodeResult, nsresult> splitNodeResult = aHTMLEditor.DoSplitNode(
+      EditorDOMPoint(&aSplittingContent,
+                     std::min(aSplitOffset, aSplittingContent.Length())),
+      aNewContent);
+  if (MOZ_UNLIKELY(splitNodeResult.isErr())) {
+    NS_WARNING("HTMLEditor::DoSplitNode() failed");
+    return splitNodeResult;
+  }
+  // When adding caret suggestion to SplitNodeResult, here didn't change
+  // selection so that just ignore it.
+  splitNodeResult.inspect().IgnoreCaretPointSuggestion();
+  return splitNodeResult;
+}
+
+NS_IMETHODIMP SplitNodeTransaction::UndoTransaction() {
+  MOZ_LOG(GetLogModule(), LogLevel::Info,
+          ("%p SplitNodeTransaction::%s this=%s", this, __FUNCTION__,
+           ToString(*this).c_str()));
+
+  if (MOZ_UNLIKELY(NS_WARN_IF(!mHTMLEditor) || NS_WARN_IF(!mNewContent) ||
+                   NS_WARN_IF(!mParentNode) || NS_WARN_IF(!mSplitContent) ||
+                   NS_WARN_IF(mNewContent->IsBeingRemoved()))) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  // This assumes Do inserted the new node in front of the prior existing node
+  const OwningNonNull<HTMLEditor> htmlEditor = *mHTMLEditor;
+  const OwningNonNull<nsIContent> keepingContent = *mSplitContent;
+  const OwningNonNull<nsIContent> removingContent = *mNewContent;
+  EditorDOMPoint joinedPoint;
+  // Unfortunately, we cannot track joining point if moving right node content
+  // into left node since it cannot track changes from web apps and HTMLEditor
+  // never removes the content of the left node.  So it should be true that
+  // we don't need to track the point in this case.
+  nsresult rv = htmlEditor->DoJoinNodes(keepingContent, removingContent);
+  if (NS_SUCCEEDED(rv)) {
+    // Adjust split offset for redo here
+    if (joinedPoint.IsSet()) {
+      mSplitOffset = joinedPoint.Offset();
+    }
+  } else {
+    NS_WARNING("HTMLEditor::DoJoinNodes() failed");
+  }
+  return rv;
+}
+
+/* Redo cannot simply resplit the right node, because subsequent transactions
+ * on the redo stack may depend on the left node existing in its previous
+ * state.
+ */
+NS_IMETHODIMP SplitNodeTransaction::RedoTransaction() {
+  MOZ_LOG(GetLogModule(), LogLevel::Info,
+          ("%p SplitNodeTransaction::%s this=%s", this, __FUNCTION__,
+           ToString(*this).c_str()));
+
+  if (MOZ_UNLIKELY(NS_WARN_IF(!mNewContent) || NS_WARN_IF(!mParentNode) ||
+                   NS_WARN_IF(!mSplitContent) || NS_WARN_IF(!mHTMLEditor))) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  const OwningNonNull<HTMLEditor> htmlEditor = *mHTMLEditor;
+  const OwningNonNull<nsIContent> newContent = *mNewContent;
+  const OwningNonNull<nsIContent> splittingContent = *mSplitContent;
+  Result<SplitNodeResult, nsresult> splitNodeResult = DoTransactionInternal(
+      htmlEditor, splittingContent, newContent, mSplitOffset);
+  if (MOZ_UNLIKELY(splitNodeResult.isErr())) {
+    NS_WARNING("SplitNodeTransaction::DoTransactionInternal() failed");
+    return EditorBase::ToGenericNSResult(splitNodeResult.unwrapErr());
+  }
+  // When adding caret suggestion to SplitNodeResult, here didn't change
+  // selection so that just ignore it.
+  splitNodeResult.inspect().IgnoreCaretPointSuggestion();
+  return NS_OK;
+}
+
+}  // namespace mozilla