editor/libeditor/EditorCommands.cpp
author Masayuki Nakano <masayuki@d-toybox.com>
Fri, 26 Apr 2019 03:20:02 +0000
changeset 530495 fa8572b81eaac032bafe2b38028746f7491dbffe
parent 530063 feb8846c6602b5fb4a2580ee1f9155d2fb509585
child 530498 409044e9dbbdcc622a42ea9da9d9ee88ea5d4e20
permissions -rw-r--r--
Bug 1546578 - part 2: Make all editor command classes derived from `EditorCommand` class r=m_kato This patch makes all editor command classes derived from `EditorCommand` class. So, this allows `nsHTMLEditor::ExecCommand()` to access them directly in the future. Differential Revision: https://phabricator.services.mozilla.com/D28683

/* -*- 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 "EditorCommands.h"

#include "mozilla/ArrayUtils.h"
#include "mozilla/Assertions.h"
#include "mozilla/FlushType.h"
#include "mozilla/TextEditor.h"
#include "mozilla/dom/Selection.h"
#include "nsCommandParams.h"
#include "nsCOMPtr.h"
#include "nsCRT.h"
#include "nsDebug.h"
#include "nsError.h"
#include "nsIClipboard.h"
#include "nsID.h"
#include "mozilla/dom/Document.h"
#include "nsIEditor.h"
#include "nsISelectionController.h"
#include "nsITransferable.h"
#include "nsString.h"
#include "nsAString.h"

class nsISupports;

#define STATE_ENABLED "state_enabled"
#define STATE_DATA "state_data"

namespace mozilla {

/******************************************************************************
 * mozilla::EditorCommand
 ******************************************************************************/

NS_IMPL_ISUPPORTS(EditorCommand, nsIControllerCommand)

/******************************************************************************
 * mozilla::UndoCommand
 ******************************************************************************/

StaticRefPtr<UndoCommand> UndoCommand::sInstance;

NS_IMETHODIMP
UndoCommand::IsCommandEnabled(const char* aCommandName,
                              nsISupports* aCommandRefCon, bool* aIsEnabled) {
  if (NS_WARN_IF(!aIsEnabled)) {
    return NS_ERROR_INVALID_ARG;
  }

  *aIsEnabled = false;

  nsCOMPtr<nsIEditor> editor = do_QueryInterface(aCommandRefCon);
  if (!editor) {
    return NS_OK;
  }
  TextEditor* textEditor = editor->AsTextEditor();
  MOZ_ASSERT(textEditor);
  if (!textEditor->IsSelectionEditable()) {
    return NS_OK;
  }
  *aIsEnabled = textEditor->CanUndo();
  return NS_OK;
}

NS_IMETHODIMP
UndoCommand::DoCommand(const char* aCommandName, nsISupports* aCommandRefCon) {
  nsCOMPtr<nsIEditor> editor = do_QueryInterface(aCommandRefCon);
  if (!editor) {
    return NS_ERROR_FAILURE;
  }
  TextEditor* textEditor = editor->AsTextEditor();
  MOZ_ASSERT(textEditor);
  // MOZ_KnownLive because we are holding a stack ref in "editor".
  return MOZ_KnownLive(textEditor)->Undo(1);
}

NS_IMETHODIMP
UndoCommand::DoCommandParams(const char* aCommandName,
                             nsICommandParams* aParams,
                             nsISupports* aCommandRefCon) {
  return DoCommand(aCommandName, aCommandRefCon);
}

NS_IMETHODIMP
UndoCommand::GetCommandStateParams(const char* aCommandName,
                                   nsICommandParams* aParams,
                                   nsISupports* aCommandRefCon) {
  bool canUndo;
  IsCommandEnabled(aCommandName, aCommandRefCon, &canUndo);
  return aParams->AsCommandParams()->SetBool(STATE_ENABLED, canUndo);
}

/******************************************************************************
 * mozilla::RedoCommand
 ******************************************************************************/

StaticRefPtr<RedoCommand> RedoCommand::sInstance;

NS_IMETHODIMP
RedoCommand::IsCommandEnabled(const char* aCommandName,
                              nsISupports* aCommandRefCon, bool* aIsEnabled) {
  if (NS_WARN_IF(!aIsEnabled)) {
    return NS_ERROR_INVALID_ARG;
  }

  *aIsEnabled = false;

  nsCOMPtr<nsIEditor> editor = do_QueryInterface(aCommandRefCon);
  if (!editor) {
    return NS_OK;
  }
  TextEditor* textEditor = editor->AsTextEditor();
  MOZ_ASSERT(textEditor);
  if (!textEditor->IsSelectionEditable()) {
    return NS_OK;
  }
  *aIsEnabled = textEditor->CanRedo();
  return NS_OK;
}

NS_IMETHODIMP
RedoCommand::DoCommand(const char* aCommandName, nsISupports* aCommandRefCon) {
  nsCOMPtr<nsIEditor> editor = do_QueryInterface(aCommandRefCon);
  if (!editor) {
    return NS_ERROR_FAILURE;
  }
  TextEditor* textEditor = editor->AsTextEditor();
  MOZ_ASSERT(textEditor);
  // MOZ_KnownLive because we are holding a stack ref in "editor".
  return MOZ_KnownLive(textEditor)->Redo(1);
}

NS_IMETHODIMP
RedoCommand::DoCommandParams(const char* aCommandName,
                             nsICommandParams* aParams,
                             nsISupports* aCommandRefCon) {
  return DoCommand(aCommandName, aCommandRefCon);
}

NS_IMETHODIMP
RedoCommand::GetCommandStateParams(const char* aCommandName,
                                   nsICommandParams* aParams,
                                   nsISupports* aCommandRefCon) {
  bool canUndo;
  IsCommandEnabled(aCommandName, aCommandRefCon, &canUndo);
  return aParams->AsCommandParams()->SetBool(STATE_ENABLED, canUndo);
}

/******************************************************************************
 * mozilla::CutCommand
 ******************************************************************************/

StaticRefPtr<CutCommand> CutCommand::sInstance;

NS_IMETHODIMP
CutCommand::IsCommandEnabled(const char* aCommandName,
                             nsISupports* aCommandRefCon, bool* aIsEnabled) {
  if (NS_WARN_IF(!aIsEnabled)) {
    return NS_ERROR_INVALID_ARG;
  }

  *aIsEnabled = false;

  nsCOMPtr<nsIEditor> editor = do_QueryInterface(aCommandRefCon);
  if (!editor) {
    return NS_OK;
  }
  TextEditor* textEditor = editor->AsTextEditor();
  MOZ_ASSERT(textEditor);
  if (!textEditor->IsSelectionEditable()) {
    return NS_OK;
  }
  *aIsEnabled = textEditor->CanCut();
  return NS_OK;
}

NS_IMETHODIMP
CutCommand::DoCommand(const char* aCommandName, nsISupports* aCommandRefCon) {
  nsCOMPtr<nsIEditor> editor = do_QueryInterface(aCommandRefCon);
  if (!editor) {
    return NS_ERROR_FAILURE;
  }
  TextEditor* textEditor = editor->AsTextEditor();
  MOZ_ASSERT(textEditor);
  return textEditor->Cut();
}

NS_IMETHODIMP
CutCommand::DoCommandParams(const char* aCommandName, nsICommandParams* aParams,
                            nsISupports* aCommandRefCon) {
  return DoCommand(aCommandName, aCommandRefCon);
}

NS_IMETHODIMP
CutCommand::GetCommandStateParams(const char* aCommandName,
                                  nsICommandParams* aParams,
                                  nsISupports* aCommandRefCon) {
  bool canUndo;
  IsCommandEnabled(aCommandName, aCommandRefCon, &canUndo);
  return aParams->AsCommandParams()->SetBool(STATE_ENABLED, canUndo);
}

/******************************************************************************
 * mozilla::CutOrDeleteCommand
 ******************************************************************************/

StaticRefPtr<CutOrDeleteCommand> CutOrDeleteCommand::sInstance;

NS_IMETHODIMP
CutOrDeleteCommand::IsCommandEnabled(const char* aCommandName,
                                     nsISupports* aCommandRefCon,
                                     bool* aIsEnabled) {
  if (NS_WARN_IF(!aIsEnabled)) {
    return NS_ERROR_INVALID_ARG;
  }
  nsCOMPtr<nsIEditor> editor = do_QueryInterface(aCommandRefCon);
  if (!editor) {
    *aIsEnabled = false;
    return NS_OK;
  }
  TextEditor* textEditor = editor->AsTextEditor();
  MOZ_ASSERT(textEditor);
  *aIsEnabled = textEditor->IsSelectionEditable();
  return NS_OK;
}

NS_IMETHODIMP
CutOrDeleteCommand::DoCommand(const char* aCommandName,
                              nsISupports* aCommandRefCon) {
  nsCOMPtr<nsIEditor> editor = do_QueryInterface(aCommandRefCon);
  if (!editor) {
    return NS_ERROR_FAILURE;
  }
  TextEditor* textEditor = editor->AsTextEditor();
  MOZ_ASSERT(textEditor);
  dom::Selection* selection = textEditor->GetSelection();
  if (selection && selection->IsCollapsed()) {
    nsresult rv = textEditor->DeleteSelectionAsAction(nsIEditor::eNext,
                                                      nsIEditor::eStrip);
    if (NS_WARN_IF(NS_FAILED(rv))) {
      return rv;
    }
    return NS_OK;
  }
  return textEditor->Cut();
}

NS_IMETHODIMP
CutOrDeleteCommand::DoCommandParams(const char* aCommandName,
                                    nsICommandParams* aParams,
                                    nsISupports* aCommandRefCon) {
  return DoCommand(aCommandName, aCommandRefCon);
}

NS_IMETHODIMP
CutOrDeleteCommand::GetCommandStateParams(const char* aCommandName,
                                          nsICommandParams* aParams,
                                          nsISupports* aCommandRefCon) {
  bool canUndo;
  IsCommandEnabled(aCommandName, aCommandRefCon, &canUndo);
  return aParams->AsCommandParams()->SetBool(STATE_ENABLED, canUndo);
}

/******************************************************************************
 * mozilla::CopyCommand
 ******************************************************************************/

StaticRefPtr<CopyCommand> CopyCommand::sInstance;

NS_IMETHODIMP
CopyCommand::IsCommandEnabled(const char* aCommandName,
                              nsISupports* aCommandRefCon, bool* aIsEnabled) {
  if (NS_WARN_IF(!aIsEnabled)) {
    return NS_ERROR_INVALID_ARG;
  }
  nsCOMPtr<nsIEditor> editor = do_QueryInterface(aCommandRefCon);
  if (!editor) {
    *aIsEnabled = false;
    return NS_OK;
  }
  TextEditor* textEditor = editor->AsTextEditor();
  MOZ_ASSERT(textEditor);
  *aIsEnabled = textEditor->CanCopy();
  return NS_OK;
}

NS_IMETHODIMP
CopyCommand::DoCommand(const char* aCommandName, nsISupports* aCommandRefCon) {
  nsCOMPtr<nsIEditor> editor = do_QueryInterface(aCommandRefCon);
  if (!editor) {
    return NS_ERROR_FAILURE;
  }
  TextEditor* textEditor = editor->AsTextEditor();
  MOZ_ASSERT(textEditor);
  return textEditor->Copy();
}

NS_IMETHODIMP
CopyCommand::DoCommandParams(const char* aCommandName,
                             nsICommandParams* aParams,
                             nsISupports* aCommandRefCon) {
  return DoCommand(aCommandName, aCommandRefCon);
}

NS_IMETHODIMP
CopyCommand::GetCommandStateParams(const char* aCommandName,
                                   nsICommandParams* aParams,
                                   nsISupports* aCommandRefCon) {
  bool canUndo;
  IsCommandEnabled(aCommandName, aCommandRefCon, &canUndo);
  return aParams->AsCommandParams()->SetBool(STATE_ENABLED, canUndo);
}

/******************************************************************************
 * mozilla::CopyOrDeleteCommand
 ******************************************************************************/

StaticRefPtr<CopyOrDeleteCommand> CopyOrDeleteCommand::sInstance;

NS_IMETHODIMP
CopyOrDeleteCommand::IsCommandEnabled(const char* aCommandName,
                                      nsISupports* aCommandRefCon,
                                      bool* aIsEnabled) {
  if (NS_WARN_IF(!aIsEnabled)) {
    return NS_ERROR_INVALID_ARG;
  }

  nsCOMPtr<nsIEditor> editor = do_QueryInterface(aCommandRefCon);
  if (!editor) {
    *aIsEnabled = false;
    return NS_OK;
  }
  TextEditor* textEditor = editor->AsTextEditor();
  MOZ_ASSERT(textEditor);
  *aIsEnabled = textEditor->IsSelectionEditable();
  return NS_OK;
}

NS_IMETHODIMP
CopyOrDeleteCommand::DoCommand(const char* aCommandName,
                               nsISupports* aCommandRefCon) {
  nsCOMPtr<nsIEditor> editor = do_QueryInterface(aCommandRefCon);
  if (!editor) {
    return NS_ERROR_FAILURE;
  }
  TextEditor* textEditor = editor->AsTextEditor();
  MOZ_ASSERT(textEditor);
  dom::Selection* selection = textEditor->GetSelection();
  if (selection && selection->IsCollapsed()) {
    nsresult rv = textEditor->DeleteSelectionAsAction(nsIEditor::eNextWord,
                                                      nsIEditor::eStrip);
    if (NS_WARN_IF(NS_FAILED(rv))) {
      return rv;
    }
    return NS_OK;
  }
  return textEditor->Copy();
}

NS_IMETHODIMP
CopyOrDeleteCommand::DoCommandParams(const char* aCommandName,
                                     nsICommandParams* aParams,
                                     nsISupports* aCommandRefCon) {
  return DoCommand(aCommandName, aCommandRefCon);
}

NS_IMETHODIMP
CopyOrDeleteCommand::GetCommandStateParams(const char* aCommandName,
                                           nsICommandParams* aParams,
                                           nsISupports* aCommandRefCon) {
  bool canUndo;
  IsCommandEnabled(aCommandName, aCommandRefCon, &canUndo);
  return aParams->AsCommandParams()->SetBool(STATE_ENABLED, canUndo);
}

/******************************************************************************
 * mozilla::PasteCommand
 ******************************************************************************/

StaticRefPtr<PasteCommand> PasteCommand::sInstance;

NS_IMETHODIMP
PasteCommand::IsCommandEnabled(const char* aCommandName,
                               nsISupports* aCommandRefCon, bool* aIsEnabled) {
  if (NS_WARN_IF(!aIsEnabled)) {
    return NS_ERROR_INVALID_ARG;
  }

  *aIsEnabled = false;

  nsCOMPtr<nsIEditor> editor = do_QueryInterface(aCommandRefCon);
  if (!editor) {
    return NS_OK;
  }
  TextEditor* textEditor = editor->AsTextEditor();
  MOZ_ASSERT(textEditor);
  if (!textEditor->IsSelectionEditable()) {
    return NS_OK;
  }
  *aIsEnabled = textEditor->CanPaste(nsIClipboard::kGlobalClipboard);
  return NS_OK;
}

NS_IMETHODIMP
PasteCommand::DoCommand(const char* aCommandName, nsISupports* aCommandRefCon) {
  nsCOMPtr<nsIEditor> editor = do_QueryInterface(aCommandRefCon);
  if (NS_WARN_IF(!editor)) {
    return NS_ERROR_FAILURE;
  }
  TextEditor* textEditor = editor->AsTextEditor();
  MOZ_ASSERT(textEditor);
  // MOZ_KnownLive because we are holding a stack ref in "editor".
  return MOZ_KnownLive(textEditor)
      ->PasteAsAction(nsIClipboard::kGlobalClipboard, true);
}

NS_IMETHODIMP
PasteCommand::DoCommandParams(const char* aCommandName,
                              nsICommandParams* aParams,
                              nsISupports* aCommandRefCon) {
  return DoCommand(aCommandName, aCommandRefCon);
}

NS_IMETHODIMP
PasteCommand::GetCommandStateParams(const char* aCommandName,
                                    nsICommandParams* aParams,
                                    nsISupports* aCommandRefCon) {
  bool canUndo;
  IsCommandEnabled(aCommandName, aCommandRefCon, &canUndo);
  return aParams->AsCommandParams()->SetBool(STATE_ENABLED, canUndo);
}

/******************************************************************************
 * mozilla::PasteTransferableCommand
 ******************************************************************************/

StaticRefPtr<PasteTransferableCommand> PasteTransferableCommand::sInstance;

NS_IMETHODIMP
PasteTransferableCommand::IsCommandEnabled(const char* aCommandName,
                                           nsISupports* aCommandRefCon,
                                           bool* aIsEnabled) {
  if (NS_WARN_IF(!aIsEnabled)) {
    return NS_ERROR_INVALID_ARG;
  }

  *aIsEnabled = false;

  nsCOMPtr<nsIEditor> editor = do_QueryInterface(aCommandRefCon);
  if (!editor) {
    return NS_OK;
  }
  TextEditor* textEditor = editor->AsTextEditor();
  MOZ_ASSERT(textEditor);
  if (!textEditor->IsSelectionEditable()) {
    return NS_OK;
  }
  *aIsEnabled = textEditor->CanPasteTransferable(nullptr);
  return NS_OK;
}

NS_IMETHODIMP
PasteTransferableCommand::DoCommand(const char* aCommandName,
                                    nsISupports* aCommandRefCon) {
  return NS_ERROR_FAILURE;
}

NS_IMETHODIMP
PasteTransferableCommand::DoCommandParams(const char* aCommandName,
                                          nsICommandParams* aParams,
                                          nsISupports* aCommandRefCon) {
  nsCOMPtr<nsIEditor> editor = do_QueryInterface(aCommandRefCon);
  if (NS_WARN_IF(!editor)) {
    return NS_ERROR_FAILURE;
  }

  nsCOMPtr<nsISupports> supports =
      aParams->AsCommandParams()->GetISupports("transferable");
  if (NS_WARN_IF(!supports)) {
    return NS_ERROR_FAILURE;
  }

  nsCOMPtr<nsITransferable> trans = do_QueryInterface(supports);
  if (NS_WARN_IF(!trans)) {
    return NS_ERROR_FAILURE;
  }

  TextEditor* textEditor = editor->AsTextEditor();
  MOZ_ASSERT(textEditor);
  // We know textEditor is known-live here because we are holding a ref to it
  // via "editor".
  nsresult rv = MOZ_KnownLive(textEditor)->PasteTransferable(trans);
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return rv;
  }
  return NS_OK;
}

NS_IMETHODIMP
PasteTransferableCommand::GetCommandStateParams(const char* aCommandName,
                                                nsICommandParams* aParams,
                                                nsISupports* aCommandRefCon) {
  nsCOMPtr<nsIEditor> editor = do_QueryInterface(aCommandRefCon);
  if (NS_WARN_IF(!editor)) {
    return NS_ERROR_FAILURE;
  }

  nsCOMPtr<nsISupports> supports =
      aParams->AsCommandParams()->GetISupports("transferable");
  if (NS_WARN_IF(!supports)) {
    return NS_ERROR_FAILURE;
  }

  nsCOMPtr<nsITransferable> trans;
  trans = do_QueryInterface(supports);
  if (NS_WARN_IF(!trans)) {
    return NS_ERROR_FAILURE;
  }

  TextEditor* textEditor = editor->AsTextEditor();
  MOZ_ASSERT(textEditor);

  return aParams->AsCommandParams()->SetBool(
      STATE_ENABLED, textEditor->CanPasteTransferable(trans));
}

/******************************************************************************
 * mozilla::SwitchTextDirectionCommand
 ******************************************************************************/

StaticRefPtr<SwitchTextDirectionCommand> SwitchTextDirectionCommand::sInstance;

NS_IMETHODIMP
SwitchTextDirectionCommand::IsCommandEnabled(const char* aCommandName,
                                             nsISupports* aCommandRefCon,
                                             bool* aIsEnabled) {
  if (NS_WARN_IF(!aIsEnabled)) {
    return NS_ERROR_INVALID_ARG;
  }
  nsCOMPtr<nsIEditor> editor = do_QueryInterface(aCommandRefCon);
  if (!editor) {
    *aIsEnabled = false;
    return NS_OK;
  }
  TextEditor* textEditor = editor->AsTextEditor();
  MOZ_ASSERT(textEditor);
  *aIsEnabled = textEditor->IsSelectionEditable();
  return NS_OK;
}

NS_IMETHODIMP
SwitchTextDirectionCommand::DoCommand(const char* aCommandName,
                                      nsISupports* aCommandRefCon) {
  nsCOMPtr<nsIEditor> editor = do_QueryInterface(aCommandRefCon);
  if (NS_WARN_IF(!editor)) {
    return NS_ERROR_FAILURE;
  }
  TextEditor* textEditor = editor->AsTextEditor();
  MOZ_ASSERT(textEditor);
  // MOZ_KnownLive because we are holding a stack ref in "editor".
  return MOZ_KnownLive(textEditor)->ToggleTextDirection();
}

NS_IMETHODIMP
SwitchTextDirectionCommand::DoCommandParams(const char* aCommandName,
                                            nsICommandParams* aParams,
                                            nsISupports* aCommandRefCon) {
  return DoCommand(aCommandName, aCommandRefCon);
}

NS_IMETHODIMP
SwitchTextDirectionCommand::GetCommandStateParams(const char* aCommandName,
                                                  nsICommandParams* aParams,
                                                  nsISupports* aCommandRefCon) {
  bool canSwitchTextDirection = true;
  IsCommandEnabled(aCommandName, aCommandRefCon, &canSwitchTextDirection);
  return aParams->AsCommandParams()->SetBool(STATE_ENABLED,
                                             canSwitchTextDirection);
}

/******************************************************************************
 * mozilla::DeleteCommand
 ******************************************************************************/

StaticRefPtr<DeleteCommand> DeleteCommand::sInstance;

NS_IMETHODIMP
DeleteCommand::IsCommandEnabled(const char* aCommandName,
                                nsISupports* aCommandRefCon, bool* aIsEnabled) {
  if (NS_WARN_IF(!aIsEnabled)) {
    return NS_ERROR_INVALID_ARG;
  }

  *aIsEnabled = false;

  nsCOMPtr<nsIEditor> editor = do_QueryInterface(aCommandRefCon);
  if (!editor) {
    return NS_OK;
  }

  TextEditor* textEditor = editor->AsTextEditor();
  MOZ_ASSERT(textEditor);

  // We can generally delete whenever the selection is editable.  However,
  // cmd_delete doesn't make sense if the selection is collapsed because it's
  // directionless, which is the same condition under which we can't cut.
  *aIsEnabled = textEditor->IsSelectionEditable();

  if (!nsCRT::strcmp("cmd_delete", aCommandName) && *aIsEnabled) {
    *aIsEnabled = textEditor->CanDelete();
  }
  return NS_OK;
}

NS_IMETHODIMP
DeleteCommand::DoCommand(const char* aCommandName,
                         nsISupports* aCommandRefCon) {
  nsCOMPtr<nsIEditor> editor = do_QueryInterface(aCommandRefCon);
  if (NS_WARN_IF(!editor)) {
    return NS_ERROR_FAILURE;
  }

  nsIEditor::EDirection deleteDir = nsIEditor::eNone;

  if (!nsCRT::strcmp("cmd_delete", aCommandName)) {
    // Really this should probably be eNone, but it only makes a difference if
    // the selection is collapsed, and then this command is disabled.  So let's
    // keep it as it always was to avoid breaking things.
    deleteDir = nsIEditor::ePrevious;
  } else if (!nsCRT::strcmp("cmd_deleteCharForward", aCommandName)) {
    deleteDir = nsIEditor::eNext;
  } else if (!nsCRT::strcmp("cmd_deleteCharBackward", aCommandName)) {
    deleteDir = nsIEditor::ePrevious;
  } else if (!nsCRT::strcmp("cmd_deleteWordBackward", aCommandName)) {
    deleteDir = nsIEditor::ePreviousWord;
  } else if (!nsCRT::strcmp("cmd_deleteWordForward", aCommandName)) {
    deleteDir = nsIEditor::eNextWord;
  } else if (!nsCRT::strcmp("cmd_deleteToBeginningOfLine", aCommandName)) {
    deleteDir = nsIEditor::eToBeginningOfLine;
  } else if (!nsCRT::strcmp("cmd_deleteToEndOfLine", aCommandName)) {
    deleteDir = nsIEditor::eToEndOfLine;
  } else {
    MOZ_CRASH("Unrecognized nsDeleteCommand");
  }

  TextEditor* textEditor = editor->AsTextEditor();
  MOZ_ASSERT(textEditor);
  nsresult rv =
      textEditor->DeleteSelectionAsAction(deleteDir, nsIEditor::eStrip);
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return rv;
  }
  return NS_OK;
}

NS_IMETHODIMP
DeleteCommand::DoCommandParams(const char* aCommandName,
                               nsICommandParams* aParams,
                               nsISupports* aCommandRefCon) {
  return DoCommand(aCommandName, aCommandRefCon);
}

NS_IMETHODIMP
DeleteCommand::GetCommandStateParams(const char* aCommandName,
                                     nsICommandParams* aParams,
                                     nsISupports* aCommandRefCon) {
  bool canUndo;
  IsCommandEnabled(aCommandName, aCommandRefCon, &canUndo);
  return aParams->AsCommandParams()->SetBool(STATE_ENABLED, canUndo);
}

/******************************************************************************
 * mozilla::SelectAllCommand
 ******************************************************************************/

StaticRefPtr<SelectAllCommand> SelectAllCommand::sInstance;

NS_IMETHODIMP
SelectAllCommand::IsCommandEnabled(const char* aCommandName,
                                   nsISupports* aCommandRefCon,
                                   bool* aIsEnabled) {
  NS_ENSURE_ARG_POINTER(aIsEnabled);

  nsresult rv = NS_OK;
  // You can always select all, unless the selection is editable,
  // and the editable region is empty!
  *aIsEnabled = true;

  nsCOMPtr<nsIEditor> editor = do_QueryInterface(aCommandRefCon);
  if (!editor) {
    return NS_OK;
  }

  // You can select all if there is an editor which is non-empty
  TextEditor* textEditor = editor->AsTextEditor();
  MOZ_ASSERT(textEditor);
  bool isEmpty = false;
  rv = textEditor->IsEmpty(&isEmpty);
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return rv;
  }
  *aIsEnabled = !isEmpty;
  return NS_OK;
}

NS_IMETHODIMP
SelectAllCommand::DoCommand(const char* aCommandName,
                            nsISupports* aCommandRefCon) {
  nsCOMPtr<nsIEditor> editor = do_QueryInterface(aCommandRefCon);
  if (!editor) {
    return NS_ERROR_FAILURE;
  }
  TextEditor* textEditor = editor->AsTextEditor();
  MOZ_ASSERT(textEditor);
  return MOZ_KnownLive(textEditor)->SelectAll();
}

NS_IMETHODIMP
SelectAllCommand::DoCommandParams(const char* aCommandName,
                                  nsICommandParams* aParams,
                                  nsISupports* aCommandRefCon) {
  return DoCommand(aCommandName, aCommandRefCon);
}

NS_IMETHODIMP
SelectAllCommand::GetCommandStateParams(const char* aCommandName,
                                        nsICommandParams* aParams,
                                        nsISupports* aCommandRefCon) {
  bool canUndo;
  IsCommandEnabled(aCommandName, aCommandRefCon, &canUndo);
  return aParams->AsCommandParams()->SetBool(STATE_ENABLED, canUndo);
}

/******************************************************************************
 * mozilla::SelectionMoveCommands
 ******************************************************************************/

StaticRefPtr<SelectionMoveCommands> SelectionMoveCommands::sInstance;

NS_IMETHODIMP
SelectionMoveCommands::IsCommandEnabled(const char* aCommandName,
                                        nsISupports* aCommandRefCon,
                                        bool* aIsEnabled) {
  NS_ENSURE_ARG_POINTER(aIsEnabled);
  nsCOMPtr<nsIEditor> editor = do_QueryInterface(aCommandRefCon);
  if (!editor) {
    *aIsEnabled = false;
    return NS_OK;
  }
  TextEditor* textEditor = editor->AsTextEditor();
  MOZ_ASSERT(textEditor);
  *aIsEnabled = textEditor->IsSelectionEditable();
  return NS_OK;
}

static const struct ScrollCommand {
  const char* reverseScroll;
  const char* forwardScroll;
  nsresult (NS_STDCALL nsISelectionController::*scroll)(bool);
} scrollCommands[] = {{"cmd_scrollTop", "cmd_scrollBottom",
                       &nsISelectionController::CompleteScroll},
                      {"cmd_scrollPageUp", "cmd_scrollPageDown",
                       &nsISelectionController::ScrollPage},
                      {"cmd_scrollLineUp", "cmd_scrollLineDown",
                       &nsISelectionController::ScrollLine}};

static const struct MoveCommand {
  const char* reverseMove;
  const char* forwardMove;
  const char* reverseSelect;
  const char* forwardSelect;
  nsresult (NS_STDCALL nsISelectionController::*move)(bool, bool);
} moveCommands[] = {
    {"cmd_charPrevious", "cmd_charNext", "cmd_selectCharPrevious",
     "cmd_selectCharNext", &nsISelectionController::CharacterMove},
    {"cmd_linePrevious", "cmd_lineNext", "cmd_selectLinePrevious",
     "cmd_selectLineNext", &nsISelectionController::LineMove},
    {"cmd_wordPrevious", "cmd_wordNext", "cmd_selectWordPrevious",
     "cmd_selectWordNext", &nsISelectionController::WordMove},
    {"cmd_beginLine", "cmd_endLine", "cmd_selectBeginLine", "cmd_selectEndLine",
     &nsISelectionController::IntraLineMove},
    {"cmd_movePageUp", "cmd_movePageDown", "cmd_selectPageUp",
     "cmd_selectPageDown", &nsISelectionController::PageMove},
    {"cmd_moveTop", "cmd_moveBottom", "cmd_selectTop", "cmd_selectBottom",
     &nsISelectionController::CompleteMove}};

static const struct PhysicalCommand {
  const char* move;
  const char* select;
  int16_t direction;
  int16_t amount;
} physicalCommands[] = {
    {"cmd_moveLeft", "cmd_selectLeft", nsISelectionController::MOVE_LEFT, 0},
    {"cmd_moveRight", "cmd_selectRight", nsISelectionController::MOVE_RIGHT, 0},
    {"cmd_moveUp", "cmd_selectUp", nsISelectionController::MOVE_UP, 0},
    {"cmd_moveDown", "cmd_selectDown", nsISelectionController::MOVE_DOWN, 0},
    {"cmd_moveLeft2", "cmd_selectLeft2", nsISelectionController::MOVE_LEFT, 1},
    {"cmd_moveRight2", "cmd_selectRight2", nsISelectionController::MOVE_RIGHT,
     1},
    {"cmd_moveUp2", "cmd_selectUp2", nsISelectionController::MOVE_UP, 1},
    {"cmd_moveDown2", "cmd_selectDown2", nsISelectionController::MOVE_DOWN, 1}};

NS_IMETHODIMP
SelectionMoveCommands::DoCommand(const char* aCommandName,
                                 nsISupports* aCommandRefCon) {
  nsCOMPtr<nsIEditor> editor = do_QueryInterface(aCommandRefCon);
  if (NS_WARN_IF(!editor)) {
    return NS_ERROR_FAILURE;
  }

  TextEditor* textEditor = editor->AsTextEditor();
  MOZ_ASSERT(textEditor);
  RefPtr<Document> doc = textEditor->GetDocument();
  if (doc) {
    // Most of the commands below (possibly all of them) need layout to
    // be up to date.
    doc->FlushPendingNotifications(FlushType::Layout);
  }

  nsCOMPtr<nsISelectionController> selectionController =
      textEditor->GetSelectionController();
  if (NS_WARN_IF(!selectionController)) {
    return NS_ERROR_FAILURE;
  }

  // scroll commands
  for (size_t i = 0; i < mozilla::ArrayLength(scrollCommands); i++) {
    const ScrollCommand& cmd = scrollCommands[i];
    if (!nsCRT::strcmp(aCommandName, cmd.reverseScroll)) {
      return (selectionController->*(cmd.scroll))(false);
    } else if (!nsCRT::strcmp(aCommandName, cmd.forwardScroll)) {
      return (selectionController->*(cmd.scroll))(true);
    }
  }

  // caret movement/selection commands
  for (size_t i = 0; i < mozilla::ArrayLength(moveCommands); i++) {
    const MoveCommand& cmd = moveCommands[i];
    if (!nsCRT::strcmp(aCommandName, cmd.reverseMove)) {
      return (selectionController->*(cmd.move))(false, false);
    } else if (!nsCRT::strcmp(aCommandName, cmd.forwardMove)) {
      return (selectionController->*(cmd.move))(true, false);
    } else if (!nsCRT::strcmp(aCommandName, cmd.reverseSelect)) {
      return (selectionController->*(cmd.move))(false, true);
    } else if (!nsCRT::strcmp(aCommandName, cmd.forwardSelect)) {
      return (selectionController->*(cmd.move))(true, true);
    }
  }

  // physical-direction movement/selection
  for (size_t i = 0; i < mozilla::ArrayLength(physicalCommands); i++) {
    const PhysicalCommand& cmd = physicalCommands[i];
    if (!nsCRT::strcmp(aCommandName, cmd.move)) {
      return selectionController->PhysicalMove(cmd.direction, cmd.amount,
                                               false);
    } else if (!nsCRT::strcmp(aCommandName, cmd.select)) {
      return selectionController->PhysicalMove(cmd.direction, cmd.amount, true);
    }
  }

  return NS_ERROR_FAILURE;
}

NS_IMETHODIMP
SelectionMoveCommands::DoCommandParams(const char* aCommandName,
                                       nsICommandParams* aParams,
                                       nsISupports* aCommandRefCon) {
  return DoCommand(aCommandName, aCommandRefCon);
}

NS_IMETHODIMP
SelectionMoveCommands::GetCommandStateParams(const char* aCommandName,
                                             nsICommandParams* aParams,
                                             nsISupports* aCommandRefCon) {
  bool canUndo;
  IsCommandEnabled(aCommandName, aCommandRefCon, &canUndo);
  return aParams->AsCommandParams()->SetBool(STATE_ENABLED, canUndo);
}

/******************************************************************************
 * mozilla::InsertPlaintextCommand
 ******************************************************************************/

StaticRefPtr<InsertPlaintextCommand> InsertPlaintextCommand::sInstance;

NS_IMETHODIMP
InsertPlaintextCommand::IsCommandEnabled(const char* aCommandName,
                                         nsISupports* aCommandRefCon,
                                         bool* aIsEnabled) {
  if (NS_WARN_IF(!aIsEnabled)) {
    return NS_ERROR_INVALID_ARG;
  }
  nsCOMPtr<nsIEditor> editor = do_QueryInterface(aCommandRefCon);
  if (NS_WARN_IF(!editor)) {
    *aIsEnabled = false;
    return NS_ERROR_FAILURE;
  }
  TextEditor* textEditor = editor->AsTextEditor();
  MOZ_ASSERT(textEditor);
  *aIsEnabled = textEditor->IsSelectionEditable();
  return NS_OK;
}

NS_IMETHODIMP
InsertPlaintextCommand::DoCommand(const char* aCommandName,
                                  nsISupports* aCommandRefCon) {
  // No value is equivalent to empty string
  nsCOMPtr<nsIEditor> editor = do_QueryInterface(aCommandRefCon);
  if (NS_WARN_IF(!editor)) {
    return NS_ERROR_FAILURE;
  }
  TextEditor* textEditor = editor->AsTextEditor();
  MOZ_ASSERT(textEditor);
  // XXX InsertTextAsAction() is not same as OnInputText().  However, other
  //     commands to insert line break or paragraph separator use OnInput*().
  //     According to the semantics of those methods, using *AsAction() is
  //     better, however, this may not cause two or more placeholder
  //     transactions to the top transaction since its name may not be
  //     nsGkAtoms::TypingTxnName.
  DebugOnly<nsresult> rv = textEditor->InsertTextAsAction(EmptyString());
  NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "Failed to insert empty string");
  return NS_OK;
}

NS_IMETHODIMP
InsertPlaintextCommand::DoCommandParams(const char* aCommandName,
                                        nsICommandParams* aParams,
                                        nsISupports* aCommandRefCon) {
  if (NS_WARN_IF(!aParams)) {
    return NS_ERROR_INVALID_ARG;
  }

  nsCOMPtr<nsIEditor> editor = do_QueryInterface(aCommandRefCon);
  if (NS_WARN_IF(!editor)) {
    return NS_ERROR_FAILURE;
  }

  // Get text to insert from command params
  nsAutoString text;
  nsresult rv = aParams->AsCommandParams()->GetString(STATE_DATA, text);
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return rv;
  }

  TextEditor* textEditor = editor->AsTextEditor();
  MOZ_ASSERT(textEditor);
  // XXX InsertTextAsAction() is not same as OnInputText().  However, other
  //     commands to insert line break or paragraph separator use OnInput*().
  //     According to the semantics of those methods, using *AsAction() is
  //     better, however, this may not cause two or more placeholder
  //     transactions to the top transaction since its name may not be
  //     nsGkAtoms::TypingTxnName.
  rv = textEditor->InsertTextAsAction(text);
  NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "Failed to insert the text");
  return NS_OK;
}

NS_IMETHODIMP
InsertPlaintextCommand::GetCommandStateParams(const char* aCommandName,
                                              nsICommandParams* aParams,
                                              nsISupports* aCommandRefCon) {
  if (NS_WARN_IF(!aParams)) {
    return NS_ERROR_INVALID_ARG;
  }

  bool aIsEnabled = false;
  IsCommandEnabled(aCommandName, aCommandRefCon, &aIsEnabled);
  return aParams->AsCommandParams()->SetBool(STATE_ENABLED, aIsEnabled);
}

/******************************************************************************
 * mozilla::InsertParagraphCommand
 ******************************************************************************/

StaticRefPtr<InsertParagraphCommand> InsertParagraphCommand::sInstance;

NS_IMETHODIMP
InsertParagraphCommand::IsCommandEnabled(const char* aCommandName,
                                         nsISupports* aCommandRefCon,
                                         bool* aIsEnabled) {
  if (NS_WARN_IF(!aIsEnabled)) {
    return NS_ERROR_INVALID_ARG;
  }
  nsCOMPtr<nsIEditor> editor = do_QueryInterface(aCommandRefCon);
  if (NS_WARN_IF(!editor)) {
    *aIsEnabled = false;
    return NS_ERROR_FAILURE;
  }

  TextEditor* textEditor = editor->AsTextEditor();
  MOZ_ASSERT(textEditor);
  *aIsEnabled = textEditor->IsSelectionEditable();
  return NS_OK;
}

NS_IMETHODIMP
InsertParagraphCommand::DoCommand(const char* aCommandName,
                                  nsISupports* aCommandRefCon) {
  nsCOMPtr<nsIEditor> editor = do_QueryInterface(aCommandRefCon);
  if (NS_WARN_IF(!editor)) {
    return NS_ERROR_FAILURE;
  }

  HTMLEditor* htmlEditor = editor->AsHTMLEditor();
  if (!htmlEditor) {
    return NS_OK;  // Do nothing for now.
  }
  return htmlEditor->InsertParagraphSeparatorAsAction();
}

NS_IMETHODIMP
InsertParagraphCommand::DoCommandParams(const char* aCommandName,
                                        nsICommandParams* aParams,
                                        nsISupports* aCommandRefCon) {
  return DoCommand(aCommandName, aCommandRefCon);
}

NS_IMETHODIMP
InsertParagraphCommand::GetCommandStateParams(const char* aCommandName,
                                              nsICommandParams* aParams,
                                              nsISupports* aCommandRefCon) {
  if (NS_WARN_IF(!aParams)) {
    return NS_ERROR_INVALID_ARG;
  }

  bool aIsEnabled = false;
  IsCommandEnabled(aCommandName, aCommandRefCon, &aIsEnabled);
  return aParams->AsCommandParams()->SetBool(STATE_ENABLED, aIsEnabled);
}

/******************************************************************************
 * mozilla::InsertLineBreakCommand
 ******************************************************************************/

StaticRefPtr<InsertLineBreakCommand> InsertLineBreakCommand::sInstance;

NS_IMETHODIMP
InsertLineBreakCommand::IsCommandEnabled(const char* aCommandName,
                                         nsISupports* aCommandRefCon,
                                         bool* aIsEnabled) {
  if (NS_WARN_IF(!aIsEnabled)) {
    return NS_ERROR_INVALID_ARG;
  }
  nsCOMPtr<nsIEditor> editor = do_QueryInterface(aCommandRefCon);
  if (NS_WARN_IF(!editor)) {
    *aIsEnabled = false;
    return NS_ERROR_FAILURE;
  }

  TextEditor* textEditor = editor->AsTextEditor();
  MOZ_ASSERT(textEditor);
  *aIsEnabled = textEditor->IsSelectionEditable();
  return NS_OK;
}

NS_IMETHODIMP
InsertLineBreakCommand::DoCommand(const char* aCommandName,
                                  nsISupports* aCommandRefCon) {
  nsCOMPtr<nsIEditor> editor = do_QueryInterface(aCommandRefCon);
  if (NS_WARN_IF(!editor)) {
    return NS_ERROR_FAILURE;
  }

  HTMLEditor* htmlEditor = editor->AsHTMLEditor();
  if (!htmlEditor) {
    return NS_ERROR_FAILURE;
  }
  return htmlEditor->InsertLineBreakAsAction();
}

NS_IMETHODIMP
InsertLineBreakCommand::DoCommandParams(const char* aCommandName,
                                        nsICommandParams* aParams,
                                        nsISupports* aCommandRefCon) {
  return DoCommand(aCommandName, aCommandRefCon);
}

NS_IMETHODIMP
InsertLineBreakCommand::GetCommandStateParams(const char* aCommandName,
                                              nsICommandParams* aParams,
                                              nsISupports* aCommandRefCon) {
  if (NS_WARN_IF(!aParams)) {
    return NS_ERROR_INVALID_ARG;
  }

  bool aIsEnabled = false;
  IsCommandEnabled(aCommandName, aCommandRefCon, &aIsEnabled);
  return aParams->AsCommandParams()->SetBool(STATE_ENABLED, aIsEnabled);
}

/******************************************************************************
 * mozilla::PasteQuotationCommand
 ******************************************************************************/

StaticRefPtr<PasteQuotationCommand> PasteQuotationCommand::sInstance;

NS_IMETHODIMP
PasteQuotationCommand::IsCommandEnabled(const char* aCommandName,
                                        nsISupports* aCommandRefCon,
                                        bool* aIsEnabled) {
  if (NS_WARN_IF(!aIsEnabled)) {
    return NS_ERROR_INVALID_ARG;
  }

  *aIsEnabled = false;

  nsCOMPtr<nsIEditor> editor = do_QueryInterface(aCommandRefCon);
  if (!editor) {
    return NS_OK;
  }
  TextEditor* textEditor = editor->AsTextEditor();
  MOZ_ASSERT(textEditor);
  if (textEditor->IsSingleLineEditor()) {
    return NS_OK;
  }
  *aIsEnabled = textEditor->CanPaste(nsIClipboard::kGlobalClipboard);
  return NS_OK;
}

NS_IMETHODIMP
PasteQuotationCommand::DoCommand(const char* aCommandName,
                                 nsISupports* aCommandRefCon) {
  nsCOMPtr<nsIEditor> editor = do_QueryInterface(aCommandRefCon);
  if (NS_WARN_IF(!editor)) {
    return NS_ERROR_FAILURE;
  }
  TextEditor* textEditor = editor->AsTextEditor();
  MOZ_ASSERT(textEditor);
  // MOZ_KnownLive because we are holding a stack ref in "editor".
  nsresult rv =
      MOZ_KnownLive(textEditor)
          ->PasteAsQuotationAsAction(nsIClipboard::kGlobalClipboard, true);
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return rv;
  }
  return NS_OK;
}

NS_IMETHODIMP
PasteQuotationCommand::DoCommandParams(const char* aCommandName,
                                       nsICommandParams* aParams,
                                       nsISupports* aCommandRefCon) {
  nsCOMPtr<nsIEditor> editor = do_QueryInterface(aCommandRefCon);
  if (!editor) {
    return NS_ERROR_FAILURE;
  }
  TextEditor* textEditor = editor->AsTextEditor();
  MOZ_ASSERT(textEditor);
  // MOZ_KnownLive because we are holding a stack ref in "editor".
  nsresult rv =
      MOZ_KnownLive(textEditor)
          ->PasteAsQuotationAsAction(nsIClipboard::kGlobalClipboard, true);
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return rv;
  }
  return NS_OK;
}

NS_IMETHODIMP
PasteQuotationCommand::GetCommandStateParams(const char* aCommandName,
                                             nsICommandParams* aParams,
                                             nsISupports* aCommandRefCon) {
  nsCOMPtr<nsIEditor> editor = do_QueryInterface(aCommandRefCon);
  if (!editor) {
    return NS_OK;
  }
  TextEditor* textEditor = editor->AsTextEditor();
  MOZ_ASSERT(textEditor);
  aParams->AsCommandParams()->SetBool(
      STATE_ENABLED, textEditor->CanPaste(nsIClipboard::kGlobalClipboard));
  return NS_OK;
}

}  // namespace mozilla