1 files changed, 109 insertions, 0 deletions
diff --git a/editor/libeditor/JoinNodeTransaction.cpp b/editor/libeditor/JoinNodeTransaction.cpp
new file mode 100644
index 0000000000..228d1f4d6a
--- /dev/null
+++ b/editor/libeditor/JoinNodeTransaction.cpp
@@ -0,0 +1,109 @@
+/* -*- 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 "JoinNodeTransaction.h"
+
+#include "mozilla/EditorBase.h"         // for EditorBase
+#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 "nsIDOMCharacterData.h"        // for nsIDOMCharacterData
+#include "nsIEditor.h"                  // for EditorBase::IsModifiableNode
+#include "nsISupportsImpl.h"            // for QueryInterface, etc.
+
+namespace mozilla {
+
+using namespace dom;
+
+JoinNodeTransaction::JoinNodeTransaction(EditorBase& aEditorBase,
+                                         nsINode& aLeftNode,
+                                         nsINode& aRightNode)
+  : mEditorBase(aEditorBase)
+  , mLeftNode(&aLeftNode)
+  , mRightNode(&aRightNode)
+  , mOffset(0)
+{
+}
+
+NS_IMPL_CYCLE_COLLECTION_INHERITED(JoinNodeTransaction, EditTransactionBase,
+                                   mLeftNode,
+                                   mRightNode,
+                                   mParent)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(JoinNodeTransaction)
+NS_INTERFACE_MAP_END_INHERITING(EditTransactionBase)
+
+nsresult
+JoinNodeTransaction::CheckValidity()
+{
+  if (!mEditorBase.IsModifiableNode(mLeftNode->GetParentNode())) {
+    return NS_ERROR_FAILURE;
+  }
+  return NS_OK;
+}
+
+// After DoTransaction() and RedoTransaction(), the left node is removed from
+// the content tree and right node remains.
+NS_IMETHODIMP
+JoinNodeTransaction::DoTransaction()
+{
+  // Get the parent node
+  nsCOMPtr<nsINode> leftParent = mLeftNode->GetParentNode();
+  NS_ENSURE_TRUE(leftParent, NS_ERROR_NULL_POINTER);
+
+  // Verify that mLeftNode and mRightNode have the same parent
+  if (leftParent != mRightNode->GetParentNode()) {
+    NS_ASSERTION(false, "Nodes do not have same parent");
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  // Set this instance's mParent.  Other methods will see a non-null mParent
+  // and know all is well
+  mParent = leftParent;
+  mOffset = mLeftNode->Length();
+
+  return mEditorBase.JoinNodesImpl(mRightNode, mLeftNode, mParent);
+}
+
+//XXX: What if instead of split, we just deleted the unneeded children of
+//     mRight and re-inserted mLeft?
+NS_IMETHODIMP
+JoinNodeTransaction::UndoTransaction()
+{
+  MOZ_ASSERT(mParent);
+
+  // First, massage the existing node so it is in its post-split state
+  ErrorResult rv;
+  if (mRightNode->GetAsText()) {
+    rv = mRightNode->GetAsText()->DeleteData(0, mOffset);
+  } else {
+    nsCOMPtr<nsIContent> child = mRightNode->GetFirstChild();
+    for (uint32_t i = 0; i < mOffset; i++) {
+      if (rv.Failed()) {
+        return rv.StealNSResult();
+      }
+      if (!child) {
+        return NS_ERROR_NULL_POINTER;
+      }
+      nsCOMPtr<nsIContent> nextSibling = child->GetNextSibling();
+      mLeftNode->AppendChild(*child, rv);
+      child = nextSibling;
+    }
+  }
+  // Second, re-insert the left node into the tree
+  nsCOMPtr<nsINode> refNode = mRightNode;
+  mParent->InsertBefore(*mLeftNode, refNode, rv);
+  return rv.StealNSResult();
+}
+
+NS_IMETHODIMP
+JoinNodeTransaction::GetTxnDescription(nsAString& aString)
+{
+  aString.AssignLiteral("JoinNodeTransaction");
+  return NS_OK;
+}
+
+} // namespace mozilla