1 files changed, 128 insertions, 0 deletions
diff --git a/editor/libeditor/SplitNodeTransaction.cpp b/editor/libeditor/SplitNodeTransaction.cpp
new file mode 100644
index 0000000000..113ff7a611
--- /dev/null
+++ b/editor/libeditor/SplitNodeTransaction.cpp
@@ -0,0 +1,128 @@
+/* -*- 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 "mozilla/EditorBase.h"         // for EditorBase
+#include "mozilla/dom/Selection.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;
+
+SplitNodeTransaction::SplitNodeTransaction(EditorBase& aEditorBase,
+                                           nsIContent& aNode,
+                                           int32_t aOffset)
+  : mEditorBase(aEditorBase)
+  , mExistingRightNode(&aNode)
+  , mOffset(aOffset)
+{
+}
+
+SplitNodeTransaction::~SplitNodeTransaction()
+{
+}
+
+NS_IMPL_CYCLE_COLLECTION_INHERITED(SplitNodeTransaction, EditTransactionBase,
+                                   mParent,
+                                   mNewLeftNode)
+
+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()
+{
+  // Create a new node
+  ErrorResult rv;
+  // Don't use .downcast directly because AsContent has an assertion we want
+  nsCOMPtr<nsINode> clone = mExistingRightNode->CloneNode(false, rv);
+  NS_ASSERTION(!rv.Failed() && clone, "Could not create clone");
+  NS_ENSURE_TRUE(!rv.Failed() && clone, rv.StealNSResult());
+  mNewLeftNode = dont_AddRef(clone.forget().take()->AsContent());
+  mEditorBase.MarkNodeDirty(mExistingRightNode->AsDOMNode());
+
+  // Get the parent node
+  mParent = mExistingRightNode->GetParentNode();
+  NS_ENSURE_TRUE(mParent, NS_ERROR_NULL_POINTER);
+
+  // Insert the new node
+  rv = mEditorBase.SplitNodeImpl(*mExistingRightNode, mOffset, *mNewLeftNode);
+  if (mEditorBase.GetShouldTxnSetSelection()) {
+    RefPtr<Selection> selection = mEditorBase.GetSelection();
+    NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);
+    rv = selection->Collapse(mNewLeftNode, mOffset);
+  }
+  return rv.StealNSResult();
+}
+
+NS_IMETHODIMP
+SplitNodeTransaction::UndoTransaction()
+{
+  MOZ_ASSERT(mNewLeftNode && mParent);
+
+  // This assumes Do inserted the new node in front of the prior existing node
+  return mEditorBase.JoinNodesImpl(mExistingRightNode, mNewLeftNode, mParent);
+}
+
+/* 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_ASSERT(mNewLeftNode && mParent);
+
+  ErrorResult rv;
+  // First, massage the existing node so it is in its post-split state
+  if (mExistingRightNode->GetAsText()) {
+    rv = mExistingRightNode->GetAsText()->DeleteData(0, mOffset);
+    NS_ENSURE_TRUE(!rv.Failed(), rv.StealNSResult());
+  } else {
+    nsCOMPtr<nsIContent> child = mExistingRightNode->GetFirstChild();
+    nsCOMPtr<nsIContent> nextSibling;
+    for (int32_t i=0; i < mOffset; i++) {
+      if (rv.Failed()) {
+        return rv.StealNSResult();
+      }
+      if (!child) {
+        return NS_ERROR_NULL_POINTER;
+      }
+      nextSibling = child->GetNextSibling();
+      mExistingRightNode->RemoveChild(*child, rv);
+      if (!rv.Failed()) {
+        mNewLeftNode->AppendChild(*child, rv);
+      }
+      child = nextSibling;
+    }
+  }
+  // Second, re-insert the left node into the tree
+  nsCOMPtr<nsIContent> refNode = mExistingRightNode;
+  mParent->InsertBefore(*mNewLeftNode, refNode, rv);
+  return rv.StealNSResult();
+}
+
+
+NS_IMETHODIMP
+SplitNodeTransaction::GetTxnDescription(nsAString& aString)
+{
+  aString.AssignLiteral("SplitNodeTransaction");
+  return NS_OK;
+}
+
+nsIContent*
+SplitNodeTransaction::GetNewNode()
+{
+  return mNewLeftNode;
+}
+
+} // namespace mozilla