Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1349 insertions, 0 deletions

diff --git a/editor/libeditor/HTMLEditorCommands.cpp b/editor/libeditor/HTMLEditorCommands.cpp
new file mode 100644
index 0000000000..1864299a3a
--- /dev/null
+++ b/editor/libeditor/HTMLEditorCommands.cpp
@@ -0,0 +1,1349 @@
+/* -*- 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 "mozilla/EditorCommands.h"
+
+#include "mozilla/Assertions.h"  // for MOZ_ASSERT, etc
+#include "mozilla/EditorBase.h"  // for EditorBase
+#include "mozilla/ErrorResult.h"
+#include "mozilla/HTMLEditor.h"  // for HTMLEditor
+#include "mozilla/dom/Element.h"
+#include "nsAString.h"
+#include "nsAtom.h"                   // for nsAtom, nsStaticAtom, etc
+#include "nsCommandParams.h"          // for nsCommandParams, etc
+#include "nsComponentManagerUtils.h"  // for do_CreateInstance
+#include "nsGkAtoms.h"                // for nsGkAtoms, nsGkAtoms::font, etc
+#include "nsIClipboard.h"             // for nsIClipboard, etc
+#include "nsIEditingSession.h"
+#include "nsIPrincipal.h"     // for nsIPrincipal
+#include "nsLiteralString.h"  // for NS_LITERAL_STRING
+#include "nsReadableUtils.h"  // for EmptyString
+#include "nsString.h"         // for nsAutoString, nsString, etc
+#include "nsStringFwd.h"      // for nsString
+
+class nsISupports;
+
+namespace mozilla {
+using dom::Element;
+
+// prototype
+static nsresult GetListState(HTMLEditor* aHTMLEditor, bool* aMixed,
+                             nsAString& aLocalName);
+
+// defines
+#define STATE_ENABLED "state_enabled"
+#define STATE_ALL "state_all"
+#define STATE_ANY "state_any"
+#define STATE_MIXED "state_mixed"
+#define STATE_BEGIN "state_begin"
+#define STATE_END "state_end"
+#define STATE_ATTRIBUTE "state_attribute"
+#define STATE_DATA "state_data"
+
+/*****************************************************************************
+ * mozilla::StateUpdatingCommandBase
+ *****************************************************************************/
+
+bool StateUpdatingCommandBase::IsCommandEnabled(Command aCommand,
+                                                EditorBase* aEditorBase) const {
+  HTMLEditor* htmlEditor = HTMLEditor::GetFrom(aEditorBase);
+  if (!htmlEditor) {
+    return false;
+  }
+  if (!htmlEditor->IsSelectionEditable()) {
+    return false;
+  }
+  if (aCommand == Command::FormatAbsolutePosition) {
+    return htmlEditor->IsAbsolutePositionEditorEnabled();
+  }
+  return true;
+}
+
+nsresult StateUpdatingCommandBase::DoCommand(Command aCommand,
+                                             EditorBase& aEditorBase,
+                                             nsIPrincipal* aPrincipal) const {
+  HTMLEditor* htmlEditor = aEditorBase.GetAsHTMLEditor();
+  if (NS_WARN_IF(!htmlEditor)) {
+    return NS_ERROR_FAILURE;
+  }
+  nsStaticAtom* tagName = GetTagName(aCommand);
+  if (NS_WARN_IF(!tagName)) {
+    return NS_ERROR_UNEXPECTED;
+  }
+  nsresult rv = ToggleState(MOZ_KnownLive(*tagName), MOZ_KnownLive(*htmlEditor),
+                            aPrincipal);
+  NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
+                       "StateUpdatingCommandBase::ToggleState() failed");
+  return rv;
+}
+
+nsresult StateUpdatingCommandBase::GetCommandStateParams(
+    Command aCommand, nsCommandParams& aParams, EditorBase* aEditorBase,
+    nsIEditingSession* aEditingSession) const {
+  if (!aEditorBase) {
+    return NS_OK;
+  }
+  HTMLEditor* htmlEditor = aEditorBase->GetAsHTMLEditor();
+  if (NS_WARN_IF(!htmlEditor)) {
+    return NS_ERROR_FAILURE;
+  }
+  nsStaticAtom* tagName = GetTagName(aCommand);
+  if (NS_WARN_IF(!tagName)) {
+    return NS_ERROR_UNEXPECTED;
+  }
+  // MOZ_KnownLive(htmlEditor) because the lifetime of aEditorBase is guaranteed
+  // by the callers.
+  // MOZ_KnownLive(tagName) because nsStaticAtom instances are alive until
+  // shutting down.
+  nsresult rv = GetCurrentState(MOZ_KnownLive(*tagName),
+                                MOZ_KnownLive(*htmlEditor), aParams);
+  NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
+                       "StateUpdatingCommandBase::GetCurrentState() failed");
+  return rv;
+}
+
+/*****************************************************************************
+ * mozilla::PasteNoFormattingCommand
+ *****************************************************************************/
+
+StaticRefPtr<PasteNoFormattingCommand> PasteNoFormattingCommand::sInstance;
+
+bool PasteNoFormattingCommand::IsCommandEnabled(Command aCommand,
+                                                EditorBase* aEditorBase) const {
+  HTMLEditor* htmlEditor = HTMLEditor::GetFrom(aEditorBase);
+  if (!htmlEditor) {
+    return false;
+  }
+  return htmlEditor->CanPaste(nsIClipboard::kGlobalClipboard);
+}
+
+nsresult PasteNoFormattingCommand::DoCommand(Command aCommand,
+                                             EditorBase& aEditorBase,
+                                             nsIPrincipal* aPrincipal) const {
+  HTMLEditor* htmlEditor = aEditorBase.GetAsHTMLEditor();
+  if (NS_WARN_IF(!htmlEditor)) {
+    return NS_ERROR_FAILURE;
+  }
+  // Known live because we hold a ref above in "editor"
+  nsresult rv = MOZ_KnownLive(htmlEditor)
+                    ->PasteNoFormattingAsAction(
+                        nsIClipboard::kGlobalClipboard,
+                        EditorBase::DispatchPasteEvent::Yes, aPrincipal);
+  NS_WARNING_ASSERTION(
+      NS_SUCCEEDED(rv),
+      "HTMLEditor::PasteNoFormattingAsAction(DispatchPasteEvent::Yes) failed");
+  return rv;
+}
+
+nsresult PasteNoFormattingCommand::GetCommandStateParams(
+    Command aCommand, nsCommandParams& aParams, EditorBase* aEditorBase,
+    nsIEditingSession* aEditingSession) const {
+  return aParams.SetBool(STATE_ENABLED,
+                         IsCommandEnabled(aCommand, aEditorBase));
+}
+
+/*****************************************************************************
+ * mozilla::StyleUpdatingCommand
+ *****************************************************************************/
+
+StaticRefPtr<StyleUpdatingCommand> StyleUpdatingCommand::sInstance;
+
+nsresult StyleUpdatingCommand::GetCurrentState(nsStaticAtom& aTagName,
+                                               HTMLEditor& aHTMLEditor,
+                                               nsCommandParams& aParams) const {
+  bool firstOfSelectionHasProp = false;
+  bool anyOfSelectionHasProp = false;
+  bool allOfSelectionHasProp = false;
+
+  nsresult rv = aHTMLEditor.GetInlineProperty(
+      aTagName, nullptr, u""_ns, &firstOfSelectionHasProp,
+      &anyOfSelectionHasProp, &allOfSelectionHasProp);
+  NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
+                       "HTMLEditor::GetInlineProperty() failed");
+
+  aParams.SetBool(STATE_ENABLED, NS_SUCCEEDED(rv));
+  aParams.SetBool(STATE_ALL, allOfSelectionHasProp);
+  aParams.SetBool(STATE_ANY, anyOfSelectionHasProp);
+  aParams.SetBool(STATE_MIXED, anyOfSelectionHasProp && !allOfSelectionHasProp);
+  aParams.SetBool(STATE_BEGIN, firstOfSelectionHasProp);
+  aParams.SetBool(STATE_END, allOfSelectionHasProp);  // not completely accurate
+  return NS_OK;
+}
+
+nsresult StyleUpdatingCommand::ToggleState(nsStaticAtom& aTagName,
+                                           HTMLEditor& aHTMLEditor,
+                                           nsIPrincipal* aPrincipal) const {
+  RefPtr<nsCommandParams> params = new nsCommandParams();
+
+  // tags "href" and "name" are special cases in the core editor
+  // they are used to remove named anchor/link and shouldn't be used for
+  // insertion
+  bool doTagRemoval;
+  if (&aTagName == nsGkAtoms::href || &aTagName == nsGkAtoms::name) {
+    doTagRemoval = true;
+  } else {
+    // check current selection; set doTagRemoval if formatting should be removed
+    nsresult rv = GetCurrentState(aTagName, aHTMLEditor, *params);
+    if (NS_FAILED(rv)) {
+      NS_WARNING("StyleUpdatingCommand::GetCurrentState() failed");
+      return rv;
+    }
+    ErrorResult error;
+    doTagRemoval = params->GetBool(STATE_ALL, error);
+    if (NS_WARN_IF(error.Failed())) {
+      return error.StealNSResult();
+    }
+  }
+
+  if (doTagRemoval) {
+    nsresult rv =
+        aHTMLEditor.RemoveInlinePropertyAsAction(aTagName, nullptr, aPrincipal);
+    NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
+                         "HTMLEditor::RemoveInlinePropertyAsAction() failed");
+    return rv;
+  }
+
+  nsresult rv = aHTMLEditor.SetInlinePropertyAsAction(aTagName, nullptr, u""_ns,
+                                                      aPrincipal);
+  NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
+                       "HTMLEditor::SetInlinePropertyAsAction() failed");
+  return rv;
+}
+
+/*****************************************************************************
+ * mozilla::ListCommand
+ *****************************************************************************/
+
+StaticRefPtr<ListCommand> ListCommand::sInstance;
+
+nsresult ListCommand::GetCurrentState(nsStaticAtom& aTagName,
+                                      HTMLEditor& aHTMLEditor,
+                                      nsCommandParams& aParams) const {
+  bool bMixed;
+  nsAutoString localName;
+  nsresult rv = GetListState(&aHTMLEditor, &bMixed, localName);
+  if (NS_FAILED(rv)) {
+    NS_WARNING("GetListState() failed");
+    return rv;
+  }
+
+  bool inList = aTagName.Equals(localName);
+  aParams.SetBool(STATE_ALL, !bMixed && inList);
+  aParams.SetBool(STATE_MIXED, bMixed);
+  aParams.SetBool(STATE_ENABLED, true);
+  return NS_OK;
+}
+
+nsresult ListCommand::ToggleState(nsStaticAtom& aTagName,
+                                  HTMLEditor& aHTMLEditor,
+                                  nsIPrincipal* aPrincipal) const {
+  RefPtr<nsCommandParams> params = new nsCommandParams();
+  nsresult rv = GetCurrentState(aTagName, aHTMLEditor, *params);
+  if (NS_FAILED(rv)) {
+    NS_WARNING("ListCommand::GetCurrentState() failed");
+    return rv;
+  }
+
+  ErrorResult error;
+  bool inList = params->GetBool(STATE_ALL, error);
+  if (NS_WARN_IF(error.Failed())) {
+    return error.StealNSResult();
+  }
+
+  nsDependentAtomString listType(&aTagName);
+  if (inList) {
+    nsresult rv = aHTMLEditor.RemoveListAsAction(listType, aPrincipal);
+    NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
+                         "HTMLEditor::RemoveListAsAction() failed");
+    return rv;
+  }
+
+  rv = aHTMLEditor.MakeOrChangeListAsAction(
+      aTagName, u""_ns, HTMLEditor::SelectAllOfCurrentList::No, aPrincipal);
+  NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
+                       "HTMLEditor::MakeOrChangeListAsAction() failed");
+  return rv;
+}
+
+/*****************************************************************************
+ * mozilla::ListItemCommand
+ *****************************************************************************/
+
+StaticRefPtr<ListItemCommand> ListItemCommand::sInstance;
+
+nsresult ListItemCommand::GetCurrentState(nsStaticAtom& aTagName,
+                                          HTMLEditor& aHTMLEditor,
+                                          nsCommandParams& aParams) const {
+  ErrorResult error;
+  ListItemElementSelectionState state(aHTMLEditor, error);
+  if (error.Failed()) {
+    NS_WARNING("ListItemElementSelectionState failed");
+    return error.StealNSResult();
+  }
+
+  if (state.IsNotOneTypeDefinitionListItemElementSelected()) {
+    aParams.SetBool(STATE_ALL, false);
+    aParams.SetBool(STATE_MIXED, true);
+    return NS_OK;
+  }
+
+  nsStaticAtom* selectedListItemTagName = nullptr;
+  if (state.IsLIElementSelected()) {
+    selectedListItemTagName = nsGkAtoms::li;
+  } else if (state.IsDTElementSelected()) {
+    selectedListItemTagName = nsGkAtoms::dt;
+  } else if (state.IsDDElementSelected()) {
+    selectedListItemTagName = nsGkAtoms::dd;
+  }
+  aParams.SetBool(STATE_ALL, &aTagName == selectedListItemTagName);
+  aParams.SetBool(STATE_MIXED, false);
+  return NS_OK;
+}
+
+nsresult ListItemCommand::ToggleState(nsStaticAtom& aTagName,
+                                      HTMLEditor& aHTMLEditor,
+                                      nsIPrincipal* aPrincipal) const {
+  // Need to use aTagName????
+  RefPtr<nsCommandParams> params = new nsCommandParams();
+  GetCurrentState(aTagName, aHTMLEditor, *params);
+  ErrorResult error;
+  bool inList = params->GetBool(STATE_ALL, error);
+  if (NS_WARN_IF(error.Failed())) {
+    return error.StealNSResult();
+  }
+
+  if (inList) {
+    // To remove a list, first get what kind of list we're in
+    bool bMixed;
+    nsAutoString localName;
+    nsresult rv = GetListState(&aHTMLEditor, &bMixed, localName);
+    if (NS_FAILED(rv)) {
+      NS_WARNING("GetListState() failed");
+      return rv;
+    }
+    if (localName.IsEmpty() || bMixed) {
+      return NS_OK;
+    }
+    rv = aHTMLEditor.RemoveListAsAction(localName, aPrincipal);
+    NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
+                         "HTMLEditor::RemoveListAsAction() failed");
+    return rv;
+  }
+
+  // Set to the requested paragraph type
+  // XXX Note: This actually doesn't work for "LI",
+  //    but we currently don't use this for non DL lists anyway.
+  // Problem: won't this replace any current block paragraph style?
+  nsresult rv = aHTMLEditor.SetParagraphStateAsAction(
+      nsDependentAtomString(&aTagName), aPrincipal);
+  NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
+                       "HTMLEditor::SetParagraphFormatAsAction() failed");
+  return rv;
+}
+
+/*****************************************************************************
+ * mozilla::RemoveListCommand
+ *****************************************************************************/
+
+StaticRefPtr<RemoveListCommand> RemoveListCommand::sInstance;
+
+bool RemoveListCommand::IsCommandEnabled(Command aCommand,
+                                         EditorBase* aEditorBase) const {
+  HTMLEditor* htmlEditor = HTMLEditor::GetFrom(aEditorBase);
+  if (!htmlEditor) {
+    return false;
+  }
+
+  if (!htmlEditor->IsSelectionEditable()) {
+    return false;
+  }
+
+  // It is enabled if we are in any list type
+  bool bMixed;
+  nsAutoString localName;
+  nsresult rv = GetListState(MOZ_KnownLive(htmlEditor), &bMixed, localName);
+  NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "GetListState() failed");
+  return NS_SUCCEEDED(rv) && (bMixed || !localName.IsEmpty());
+}
+
+nsresult RemoveListCommand::DoCommand(Command aCommand, EditorBase& aEditorBase,
+                                      nsIPrincipal* aPrincipal) const {
+  HTMLEditor* htmlEditor = aEditorBase.GetAsHTMLEditor();
+  if (NS_WARN_IF(!htmlEditor)) {
+    return NS_OK;
+  }
+  // This removes any list type
+  nsresult rv =
+      MOZ_KnownLive(htmlEditor)->RemoveListAsAction(u""_ns, aPrincipal);
+  NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
+                       "HTMLEditor::RemoveListAsAction() failed");
+  return rv;
+}
+
+nsresult RemoveListCommand::GetCommandStateParams(
+    Command aCommand, nsCommandParams& aParams, EditorBase* aEditorBase,
+    nsIEditingSession* aEditingSession) const {
+  return aParams.SetBool(STATE_ENABLED,
+                         IsCommandEnabled(aCommand, aEditorBase));
+}
+
+/*****************************************************************************
+ * mozilla::IndentCommand
+ *****************************************************************************/
+
+StaticRefPtr<IndentCommand> IndentCommand::sInstance;
+
+bool IndentCommand::IsCommandEnabled(Command aCommand,
+                                     EditorBase* aEditorBase) const {
+  HTMLEditor* htmlEditor = HTMLEditor::GetFrom(aEditorBase);
+  if (!htmlEditor) {
+    return false;
+  }
+  return htmlEditor->IsSelectionEditable();
+}
+
+nsresult IndentCommand::DoCommand(Command aCommand, EditorBase& aEditorBase,
+                                  nsIPrincipal* aPrincipal) const {
+  HTMLEditor* htmlEditor = aEditorBase.GetAsHTMLEditor();
+  if (NS_WARN_IF(!htmlEditor)) {
+    return NS_OK;
+  }
+  nsresult rv = MOZ_KnownLive(htmlEditor)->IndentAsAction(aPrincipal);
+  NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "HTMLEditor::IndentAsAction() failed");
+  return rv;
+}
+
+nsresult IndentCommand::GetCommandStateParams(
+    Command aCommand, nsCommandParams& aParams, EditorBase* aEditorBase,
+    nsIEditingSession* aEditingSession) const {
+  return aParams.SetBool(STATE_ENABLED,
+                         IsCommandEnabled(aCommand, aEditorBase));
+}
+
+/*****************************************************************************
+ * mozilla::OutdentCommand
+ *****************************************************************************/
+
+StaticRefPtr<OutdentCommand> OutdentCommand::sInstance;
+
+bool OutdentCommand::IsCommandEnabled(Command aCommand,
+                                      EditorBase* aEditorBase) const {
+  HTMLEditor* htmlEditor = HTMLEditor::GetFrom(aEditorBase);
+  if (!htmlEditor) {
+    return false;
+  }
+  return htmlEditor->IsSelectionEditable();
+}
+
+nsresult OutdentCommand::DoCommand(Command aCommand, EditorBase& aEditorBase,
+                                   nsIPrincipal* aPrincipal) const {
+  HTMLEditor* htmlEditor = aEditorBase.GetAsHTMLEditor();
+  if (NS_WARN_IF(!htmlEditor)) {
+    return NS_OK;
+  }
+  nsresult rv = MOZ_KnownLive(htmlEditor)->OutdentAsAction(aPrincipal);
+  NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
+                       "HTMLEditor::OutdentAsAction() failed");
+  return rv;
+}
+
+nsresult OutdentCommand::GetCommandStateParams(
+    Command aCommand, nsCommandParams& aParams, EditorBase* aEditorBase,
+    nsIEditingSession* aEditingSession) const {
+  return aParams.SetBool(STATE_ENABLED,
+                         IsCommandEnabled(aCommand, aEditorBase));
+}
+
+/*****************************************************************************
+ * mozilla::MultiStateCommandBase
+ *****************************************************************************/
+
+bool MultiStateCommandBase::IsCommandEnabled(Command aCommand,
+                                             EditorBase* aEditorBase) const {
+  HTMLEditor* htmlEditor = HTMLEditor::GetFrom(aEditorBase);
+  if (!htmlEditor) {
+    return false;
+  }
+  // should be disabled sometimes, like if the current selection is an image
+  return htmlEditor->IsSelectionEditable();
+}
+
+nsresult MultiStateCommandBase::DoCommand(Command aCommand,
+                                          EditorBase& aEditorBase,
+                                          nsIPrincipal* aPrincipal) const {
+  NS_WARNING(
+      "who is calling MultiStateCommandBase::DoCommand (no implementation)?");
+  return NS_OK;
+}
+
+nsresult MultiStateCommandBase::DoCommandParam(Command aCommand,
+                                               const nsAString& aStringParam,
+                                               EditorBase& aEditorBase,
+                                               nsIPrincipal* aPrincipal) const {
+  NS_WARNING_ASSERTION(aCommand != Command::FormatJustify,
+                       "Command::FormatJustify should be used only for "
+                       "IsCommandEnabled() and GetCommandStateParams()");
+  HTMLEditor* htmlEditor = aEditorBase.GetAsHTMLEditor();
+  if (NS_WARN_IF(!htmlEditor)) {
+    return NS_ERROR_FAILURE;
+  }
+  nsresult rv = SetState(MOZ_KnownLive(htmlEditor), aStringParam, aPrincipal);
+  NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
+                       "MultiStateCommandBase::SetState() failed");
+  return rv;
+}
+
+nsresult MultiStateCommandBase::GetCommandStateParams(
+    Command aCommand, nsCommandParams& aParams, EditorBase* aEditorBase,
+    nsIEditingSession* aEditingSession) const {
+  if (!aEditorBase) {
+    return NS_OK;
+  }
+  HTMLEditor* htmlEditor = aEditorBase->GetAsHTMLEditor();
+  if (NS_WARN_IF(!htmlEditor)) {
+    return NS_ERROR_FAILURE;
+  }
+  nsresult rv = GetCurrentState(MOZ_KnownLive(htmlEditor), aParams);
+  NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
+                       "MultiStateCommandBase::GetCurrentState() failed");
+  return rv;
+}
+
+/*****************************************************************************
+ * mozilla::FormatBlockStateCommand
+ *****************************************************************************/
+
+StaticRefPtr<FormatBlockStateCommand> FormatBlockStateCommand::sInstance;
+
+nsresult FormatBlockStateCommand::GetCurrentState(
+    HTMLEditor* aHTMLEditor, nsCommandParams& aParams) const {
+  if (NS_WARN_IF(!aHTMLEditor)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  ErrorResult error;
+  ParagraphStateAtSelection state(
+      *aHTMLEditor,
+      ParagraphStateAtSelection::FormatBlockMode::HTMLFormatBlockCommand,
+      error);
+  if (error.Failed()) {
+    NS_WARNING("ParagraphStateAtSelection failed");
+    return error.StealNSResult();
+  }
+  aParams.SetBool(STATE_MIXED, state.IsMixed());
+  if (NS_WARN_IF(!state.GetFirstParagraphStateAtSelection())) {
+    aParams.SetCString(STATE_ATTRIBUTE, ""_ns);
+  } else {
+    nsCString paragraphState;  // Don't use `nsAutoCString` for avoiding copy.
+    state.GetFirstParagraphStateAtSelection()->ToUTF8String(paragraphState);
+    aParams.SetCString(STATE_ATTRIBUTE, paragraphState);
+  }
+  return NS_OK;
+}
+
+nsresult FormatBlockStateCommand::SetState(HTMLEditor* aHTMLEditor,
+                                           const nsAString& aNewState,
+                                           nsIPrincipal* aPrincipal) const {
+  if (NS_WARN_IF(!aHTMLEditor) || NS_WARN_IF(aNewState.IsEmpty())) {
+    return NS_ERROR_INVALID_ARG;
+  }
+  nsresult rv = aHTMLEditor->FormatBlockAsAction(aNewState, aPrincipal);
+  NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
+                       "HTMLEditor::FormatBlockAsAction() failed");
+  return rv;
+}
+
+/*****************************************************************************
+ * mozilla::ParagraphStateCommand
+ *****************************************************************************/
+
+StaticRefPtr<ParagraphStateCommand> ParagraphStateCommand::sInstance;
+
+nsresult ParagraphStateCommand::GetCurrentState(
+    HTMLEditor* aHTMLEditor, nsCommandParams& aParams) const {
+  if (NS_WARN_IF(!aHTMLEditor)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  ErrorResult error;
+  ParagraphStateAtSelection state(
+      *aHTMLEditor,
+      ParagraphStateAtSelection::FormatBlockMode::XULParagraphStateCommand,
+      error);
+  if (error.Failed()) {
+    NS_WARNING("ParagraphStateAtSelection failed");
+    return error.StealNSResult();
+  }
+  aParams.SetBool(STATE_MIXED, state.IsMixed());
+  if (NS_WARN_IF(!state.GetFirstParagraphStateAtSelection())) {
+    // XXX This is odd behavior, we should fix this later.
+    aParams.SetCString(STATE_ATTRIBUTE, "x"_ns);
+  } else {
+    nsCString paragraphState;  // Don't use `nsAutoCString` for avoiding copy.
+    state.GetFirstParagraphStateAtSelection()->ToUTF8String(paragraphState);
+    aParams.SetCString(STATE_ATTRIBUTE, paragraphState);
+  }
+  return NS_OK;
+}
+
+nsresult ParagraphStateCommand::SetState(HTMLEditor* aHTMLEditor,
+                                         const nsAString& aNewState,
+                                         nsIPrincipal* aPrincipal) const {
+  if (NS_WARN_IF(!aHTMLEditor)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+  nsresult rv = aHTMLEditor->SetParagraphStateAsAction(aNewState, aPrincipal);
+  NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
+                       "HTMLEditor::SetParagraphStateAsAction() failed");
+  return rv;
+}
+
+/*****************************************************************************
+ * mozilla::FontFaceStateCommand
+ *****************************************************************************/
+
+StaticRefPtr<FontFaceStateCommand> FontFaceStateCommand::sInstance;
+
+nsresult FontFaceStateCommand::GetCurrentState(HTMLEditor* aHTMLEditor,
+                                               nsCommandParams& aParams) const {
+  if (NS_WARN_IF(!aHTMLEditor)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  nsAutoString outStateString;
+  bool outMixed;
+  nsresult rv = aHTMLEditor->GetFontFaceState(&outMixed, outStateString);
+  if (NS_FAILED(rv)) {
+    NS_WARNING("HTMLEditor::GetFontFaceState() failed");
+    return rv;
+  }
+  aParams.SetBool(STATE_MIXED, outMixed);
+  aParams.SetCString(STATE_ATTRIBUTE, NS_ConvertUTF16toUTF8(outStateString));
+  return NS_OK;
+}
+
+nsresult FontFaceStateCommand::SetState(HTMLEditor* aHTMLEditor,
+                                        const nsAString& aNewState,
+                                        nsIPrincipal* aPrincipal) const {
+  if (NS_WARN_IF(!aHTMLEditor)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  if (aNewState.IsEmpty() || aNewState.EqualsLiteral("normal")) {
+    nsresult rv = aHTMLEditor->RemoveInlinePropertyAsAction(
+        *nsGkAtoms::font, nsGkAtoms::face, aPrincipal);
+    NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
+                         "HTMLEditor::RemoveInlinePropertyAsAction(nsGkAtoms::"
+                         "font, nsGkAtoms::face) failed");
+    return rv;
+  }
+
+  nsresult rv = aHTMLEditor->SetInlinePropertyAsAction(
+      *nsGkAtoms::font, nsGkAtoms::face, aNewState, aPrincipal);
+  NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
+                       "HTMLEditor::SetInlinePropertyAsAction(nsGkAtoms::font, "
+                       "nsGkAtoms::face) failed");
+  return rv;
+}
+
+/*****************************************************************************
+ * mozilla::FontSizeStateCommand
+ *****************************************************************************/
+
+StaticRefPtr<FontSizeStateCommand> FontSizeStateCommand::sInstance;
+
+nsresult FontSizeStateCommand::GetCurrentState(HTMLEditor* aHTMLEditor,
+                                               nsCommandParams& aParams) const {
+  if (NS_WARN_IF(!aHTMLEditor)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  nsAutoString outStateString;
+  bool firstHas, anyHas, allHas;
+  nsresult rv = aHTMLEditor->GetInlinePropertyWithAttrValue(
+      *nsGkAtoms::font, nsGkAtoms::size, u""_ns, &firstHas, &anyHas, &allHas,
+      outStateString);
+  if (NS_FAILED(rv)) {
+    NS_WARNING(
+        "HTMLEditor::GetInlinePropertyWithAttrValue(nsGkAtoms::font, "
+        "nsGkAtoms::size) failed");
+    return rv;
+  }
+
+  nsAutoCString tOutStateString;
+  LossyCopyUTF16toASCII(outStateString, tOutStateString);
+  aParams.SetBool(STATE_MIXED, anyHas && !allHas);
+  aParams.SetCString(STATE_ATTRIBUTE, tOutStateString);
+  aParams.SetBool(STATE_ENABLED, true);
+
+  return NS_OK;
+}
+
+// acceptable values for "aNewState" are:
+//   -2
+//   -1
+//    0
+//   +1
+//   +2
+//   +3
+//   medium
+//   normal
+nsresult FontSizeStateCommand::SetState(HTMLEditor* aHTMLEditor,
+                                        const nsAString& aNewState,
+                                        nsIPrincipal* aPrincipal) const {
+  if (NS_WARN_IF(!aHTMLEditor)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  if (!aNewState.IsEmpty() && !aNewState.EqualsLiteral("normal") &&
+      !aNewState.EqualsLiteral("medium")) {
+    nsresult rv = aHTMLEditor->SetInlinePropertyAsAction(
+        *nsGkAtoms::font, nsGkAtoms::size, aNewState, aPrincipal);
+    NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
+                         "HTMLEditor::SetInlinePropertyAsAction(nsGkAtoms::"
+                         "font, nsGkAtoms::size) failed");
+    return rv;
+  }
+
+  // remove any existing font size, big or small
+  nsresult rv = aHTMLEditor->RemoveInlinePropertyAsAction(
+      *nsGkAtoms::font, nsGkAtoms::size, aPrincipal);
+  NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
+                       "HTMLEditor::RemoveInlinePropertyAsAction(nsGkAtoms::"
+                       "font, nsGkAtoms::size) failed");
+  return rv;
+}
+
+/*****************************************************************************
+ * mozilla::FontColorStateCommand
+ *****************************************************************************/
+
+StaticRefPtr<FontColorStateCommand> FontColorStateCommand::sInstance;
+
+nsresult FontColorStateCommand::GetCurrentState(
+    HTMLEditor* aHTMLEditor, nsCommandParams& aParams) const {
+  if (NS_WARN_IF(!aHTMLEditor)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  bool outMixed;
+  nsAutoString outStateString;
+  nsresult rv = aHTMLEditor->GetFontColorState(&outMixed, outStateString);
+  if (NS_FAILED(rv)) {
+    NS_WARNING("HTMLEditor::GetFontColorState() failed");
+    return rv;
+  }
+
+  nsAutoCString tOutStateString;
+  LossyCopyUTF16toASCII(outStateString, tOutStateString);
+  aParams.SetBool(STATE_MIXED, outMixed);
+  aParams.SetCString(STATE_ATTRIBUTE, tOutStateString);
+  return NS_OK;
+}
+
+nsresult FontColorStateCommand::SetState(HTMLEditor* aHTMLEditor,
+                                         const nsAString& aNewState,
+                                         nsIPrincipal* aPrincipal) const {
+  if (NS_WARN_IF(!aHTMLEditor)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  if (aNewState.IsEmpty() || aNewState.EqualsLiteral("normal")) {
+    nsresult rv = aHTMLEditor->RemoveInlinePropertyAsAction(
+        *nsGkAtoms::font, nsGkAtoms::color, aPrincipal);
+    NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
+                         "HTMLEditor::RemoveInlinePropertyAsAction(nsGkAtoms::"
+                         "font, nsGkAtoms::color) failed");
+    return rv;
+  }
+
+  nsresult rv = aHTMLEditor->SetInlinePropertyAsAction(
+      *nsGkAtoms::font, nsGkAtoms::color, aNewState, aPrincipal);
+  NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
+                       "HTMLEditor::SetInlinePropertyAsAction(nsGkAtoms::font, "
+                       "nsGkAtoms::color) failed");
+  return rv;
+}
+
+/*****************************************************************************
+ * mozilla::HighlightColorStateCommand
+ *****************************************************************************/
+
+StaticRefPtr<HighlightColorStateCommand> HighlightColorStateCommand::sInstance;
+
+nsresult HighlightColorStateCommand::GetCurrentState(
+    HTMLEditor* aHTMLEditor, nsCommandParams& aParams) const {
+  if (NS_WARN_IF(!aHTMLEditor)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  bool outMixed;
+  nsAutoString outStateString;
+  nsresult rv = aHTMLEditor->GetHighlightColorState(&outMixed, outStateString);
+  if (NS_FAILED(rv)) {
+    NS_WARNING("HTMLEditor::GetHighlightColorState() failed");
+    return rv;
+  }
+
+  nsAutoCString tOutStateString;
+  LossyCopyUTF16toASCII(outStateString, tOutStateString);
+  aParams.SetBool(STATE_MIXED, outMixed);
+  aParams.SetCString(STATE_ATTRIBUTE, tOutStateString);
+  return NS_OK;
+}
+
+nsresult HighlightColorStateCommand::SetState(HTMLEditor* aHTMLEditor,
+                                              const nsAString& aNewState,
+                                              nsIPrincipal* aPrincipal) const {
+  if (NS_WARN_IF(!aHTMLEditor)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  if (aNewState.IsEmpty() || aNewState.EqualsLiteral("normal")) {
+    nsresult rv = aHTMLEditor->RemoveInlinePropertyAsAction(
+        *nsGkAtoms::font, nsGkAtoms::bgcolor, aPrincipal);
+    NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
+                         "HTMLEditor::RemoveInlinePropertyAsAction(nsGkAtoms::"
+                         "font, nsGkAtoms::bgcolor) failed");
+    return rv;
+  }
+
+  nsresult rv = aHTMLEditor->SetInlinePropertyAsAction(
+      *nsGkAtoms::font, nsGkAtoms::bgcolor, aNewState, aPrincipal);
+  NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
+                       "HTMLEditor::SetInlinePropertyAsAction(nsGkAtoms::font, "
+                       "nsGkAtoms::bgcolor) failed");
+  return rv;
+}
+
+/*****************************************************************************
+ * mozilla::BackgroundColorStateCommand
+ *****************************************************************************/
+
+StaticRefPtr<BackgroundColorStateCommand>
+    BackgroundColorStateCommand::sInstance;
+
+nsresult BackgroundColorStateCommand::GetCurrentState(
+    HTMLEditor* aHTMLEditor, nsCommandParams& aParams) const {
+  if (NS_WARN_IF(!aHTMLEditor)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  bool outMixed;
+  nsAutoString outStateString;
+  nsresult rv = aHTMLEditor->GetBackgroundColorState(&outMixed, outStateString);
+  if (NS_FAILED(rv)) {
+    NS_WARNING("HTMLEditor::GetBackgroundColorState() failed");
+    return rv;
+  }
+
+  nsAutoCString tOutStateString;
+  LossyCopyUTF16toASCII(outStateString, tOutStateString);
+  aParams.SetBool(STATE_MIXED, outMixed);
+  aParams.SetCString(STATE_ATTRIBUTE, tOutStateString);
+  return NS_OK;
+}
+
+nsresult BackgroundColorStateCommand::SetState(HTMLEditor* aHTMLEditor,
+                                               const nsAString& aNewState,
+                                               nsIPrincipal* aPrincipal) const {
+  if (NS_WARN_IF(!aHTMLEditor)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+  nsresult rv = aHTMLEditor->SetBackgroundColorAsAction(aNewState, aPrincipal);
+  NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
+                       "HTMLEditor::SetBackgroundColorAsAction() failed");
+  return rv;
+}
+
+/*****************************************************************************
+ * mozilla::AlignCommand
+ *****************************************************************************/
+
+StaticRefPtr<AlignCommand> AlignCommand::sInstance;
+
+nsresult AlignCommand::GetCurrentState(HTMLEditor* aHTMLEditor,
+                                       nsCommandParams& aParams) const {
+  if (NS_WARN_IF(!aHTMLEditor)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  ErrorResult error;
+  AlignStateAtSelection state(*aHTMLEditor, error);
+  if (error.Failed()) {
+    if (!state.IsSelectionRangesFound()) {
+      // If there was no selection ranges, we shouldn't throw exception for
+      // compatibility with the other browsers, but I have no better idea
+      // than returning empty string in this case.  Oddly, Blink/WebKit returns
+      // "true" or "false", but it's different from us and the value does not
+      // make sense.  Additionally, WPT loves our behavior.
+      error.SuppressException();
+      aParams.SetBool(STATE_MIXED, false);
+      aParams.SetCString(STATE_ATTRIBUTE, ""_ns);
+      return NS_OK;
+    }
+    NS_WARNING("AlignStateAtSelection failed");
+    return error.StealNSResult();
+  }
+  nsCString alignment;  // Don't use `nsAutoCString` to avoid copying string.
+  switch (state.AlignmentAtSelectionStart()) {
+    default:
+    case nsIHTMLEditor::eLeft:
+      alignment.AssignLiteral("left");
+      break;
+    case nsIHTMLEditor::eCenter:
+      alignment.AssignLiteral("center");
+      break;
+    case nsIHTMLEditor::eRight:
+      alignment.AssignLiteral("right");
+      break;
+    case nsIHTMLEditor::eJustify:
+      alignment.AssignLiteral("justify");
+      break;
+  }
+  aParams.SetBool(STATE_MIXED, false);
+  aParams.SetCString(STATE_ATTRIBUTE, alignment);
+  return NS_OK;
+}
+
+nsresult AlignCommand::SetState(HTMLEditor* aHTMLEditor,
+                                const nsAString& aNewState,
+                                nsIPrincipal* aPrincipal) const {
+  if (NS_WARN_IF(!aHTMLEditor)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+  nsresult rv = aHTMLEditor->AlignAsAction(aNewState, aPrincipal);
+  NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "HTMLEditor::AlignAsAction() failed");
+  return rv;
+}
+
+/*****************************************************************************
+ * mozilla::AbsolutePositioningCommand
+ *****************************************************************************/
+
+StaticRefPtr<AbsolutePositioningCommand> AbsolutePositioningCommand::sInstance;
+
+nsresult AbsolutePositioningCommand::GetCurrentState(
+    nsStaticAtom& aTagName, HTMLEditor& aHTMLEditor,
+    nsCommandParams& aParams) const {
+  if (!aHTMLEditor.IsAbsolutePositionEditorEnabled()) {
+    aParams.SetBool(STATE_MIXED, false);
+    aParams.SetCString(STATE_ATTRIBUTE, ""_ns);
+    return NS_OK;
+  }
+
+  RefPtr<Element> container =
+      aHTMLEditor.GetAbsolutelyPositionedSelectionContainer();
+  aParams.SetBool(STATE_MIXED, false);
+  aParams.SetCString(STATE_ATTRIBUTE, container ? "absolute"_ns : ""_ns);
+  return NS_OK;
+}
+
+nsresult AbsolutePositioningCommand::ToggleState(
+    nsStaticAtom& aTagName, HTMLEditor& aHTMLEditor,
+    nsIPrincipal* aPrincipal) const {
+  RefPtr<Element> container =
+      aHTMLEditor.GetAbsolutelyPositionedSelectionContainer();
+  nsresult rv = aHTMLEditor.SetSelectionToAbsoluteOrStaticAsAction(!container,
+                                                                   aPrincipal);
+  NS_WARNING_ASSERTION(
+      NS_SUCCEEDED(rv),
+      "HTMLEditor::SetSelectionToAbsoluteOrStaticAsAction() failed");
+  return rv;
+}
+
+/*****************************************************************************
+ * mozilla::DecreaseZIndexCommand
+ *****************************************************************************/
+
+StaticRefPtr<DecreaseZIndexCommand> DecreaseZIndexCommand::sInstance;
+
+bool DecreaseZIndexCommand::IsCommandEnabled(Command aCommand,
+                                             EditorBase* aEditorBase) const {
+  RefPtr<HTMLEditor> htmlEditor = HTMLEditor::GetFrom(aEditorBase);
+  if (!htmlEditor) {
+    return false;
+  }
+  if (!htmlEditor->IsAbsolutePositionEditorEnabled()) {
+    return false;
+  }
+  RefPtr<Element> positionedElement = htmlEditor->GetPositionedElement();
+  if (!positionedElement) {
+    return false;
+  }
+  return htmlEditor->GetZIndex(*positionedElement) > 0;
+}
+
+nsresult DecreaseZIndexCommand::DoCommand(Command aCommand,
+                                          EditorBase& aEditorBase,
+                                          nsIPrincipal* aPrincipal) const {
+  HTMLEditor* htmlEditor = aEditorBase.GetAsHTMLEditor();
+  if (NS_WARN_IF(!htmlEditor)) {
+    return NS_ERROR_FAILURE;
+  }
+  nsresult rv = MOZ_KnownLive(htmlEditor)->AddZIndexAsAction(-1, aPrincipal);
+  NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
+                       "HTMLEditor::AddZIndexAsAction(-1) failed");
+  return rv;
+}
+
+nsresult DecreaseZIndexCommand::GetCommandStateParams(
+    Command aCommand, nsCommandParams& aParams, EditorBase* aEditorBase,
+    nsIEditingSession* aEditingSession) const {
+  return aParams.SetBool(STATE_ENABLED,
+                         IsCommandEnabled(aCommand, aEditorBase));
+}
+
+/*****************************************************************************
+ * mozilla::IncreaseZIndexCommand
+ *****************************************************************************/
+
+StaticRefPtr<IncreaseZIndexCommand> IncreaseZIndexCommand::sInstance;
+
+bool IncreaseZIndexCommand::IsCommandEnabled(Command aCommand,
+                                             EditorBase* aEditorBase) const {
+  HTMLEditor* htmlEditor = HTMLEditor::GetFrom(aEditorBase);
+  if (!htmlEditor) {
+    return false;
+  }
+  if (!htmlEditor->IsAbsolutePositionEditorEnabled()) {
+    return false;
+  }
+  return !!htmlEditor->GetPositionedElement();
+}
+
+nsresult IncreaseZIndexCommand::DoCommand(Command aCommand,
+                                          EditorBase& aEditorBase,
+                                          nsIPrincipal* aPrincipal) const {
+  HTMLEditor* htmlEditor = aEditorBase.GetAsHTMLEditor();
+  if (NS_WARN_IF(!htmlEditor)) {
+    return NS_ERROR_FAILURE;
+  }
+  nsresult rv = MOZ_KnownLive(htmlEditor)->AddZIndexAsAction(1, aPrincipal);
+  NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
+                       "HTMLEditor::AddZIndexAsAction(1) failed");
+  return rv;
+}
+
+nsresult IncreaseZIndexCommand::GetCommandStateParams(
+    Command aCommand, nsCommandParams& aParams, EditorBase* aEditorBase,
+    nsIEditingSession* aEditingSession) const {
+  return aParams.SetBool(STATE_ENABLED,
+                         IsCommandEnabled(aCommand, aEditorBase));
+}
+
+/*****************************************************************************
+ * mozilla::RemoveStylesCommand
+ *****************************************************************************/
+
+StaticRefPtr<RemoveStylesCommand> RemoveStylesCommand::sInstance;
+
+bool RemoveStylesCommand::IsCommandEnabled(Command aCommand,
+                                           EditorBase* aEditorBase) const {
+  HTMLEditor* htmlEditor = HTMLEditor::GetFrom(aEditorBase);
+  if (!htmlEditor) {
+    return false;
+  }
+  // test if we have any styles?
+  return htmlEditor->IsSelectionEditable();
+}
+
+nsresult RemoveStylesCommand::DoCommand(Command aCommand,
+                                        EditorBase& aEditorBase,
+                                        nsIPrincipal* aPrincipal) const {
+  HTMLEditor* htmlEditor = aEditorBase.GetAsHTMLEditor();
+  if (NS_WARN_IF(!htmlEditor)) {
+    return NS_OK;
+  }
+  nsresult rv =
+      MOZ_KnownLive(htmlEditor)->RemoveAllInlinePropertiesAsAction(aPrincipal);
+  NS_WARNING_ASSERTION(
+      NS_SUCCEEDED(rv),
+      "HTMLEditor::RemoveAllInlinePropertiesAsAction() failed");
+  return rv;
+}
+
+nsresult RemoveStylesCommand::GetCommandStateParams(
+    Command aCommand, nsCommandParams& aParams, EditorBase* aEditorBase,
+    nsIEditingSession* aEditingSession) const {
+  return aParams.SetBool(STATE_ENABLED,
+                         IsCommandEnabled(aCommand, aEditorBase));
+}
+
+/*****************************************************************************
+ * mozilla::IncreaseFontSizeCommand
+ *****************************************************************************/
+
+StaticRefPtr<IncreaseFontSizeCommand> IncreaseFontSizeCommand::sInstance;
+
+bool IncreaseFontSizeCommand::IsCommandEnabled(Command aCommand,
+                                               EditorBase* aEditorBase) const {
+  HTMLEditor* htmlEditor = HTMLEditor::GetFrom(aEditorBase);
+  if (!htmlEditor) {
+    return false;
+  }
+  // test if we are at max size?
+  return htmlEditor->IsSelectionEditable();
+}
+
+nsresult IncreaseFontSizeCommand::DoCommand(Command aCommand,
+                                            EditorBase& aEditorBase,
+                                            nsIPrincipal* aPrincipal) const {
+  HTMLEditor* htmlEditor = aEditorBase.GetAsHTMLEditor();
+  if (NS_WARN_IF(!htmlEditor)) {
+    return NS_OK;
+  }
+  nsresult rv = MOZ_KnownLive(htmlEditor)->IncreaseFontSizeAsAction(aPrincipal);
+  NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
+                       "HTMLEditor::IncreaseFontSizeAsAction() failed");
+  return rv;
+}
+
+nsresult IncreaseFontSizeCommand::GetCommandStateParams(
+    Command aCommand, nsCommandParams& aParams, EditorBase* aEditorBase,
+    nsIEditingSession* aEditingSession) const {
+  return aParams.SetBool(STATE_ENABLED,
+                         IsCommandEnabled(aCommand, aEditorBase));
+}
+
+/*****************************************************************************
+ * mozilla::DecreaseFontSizeCommand
+ *****************************************************************************/
+
+StaticRefPtr<DecreaseFontSizeCommand> DecreaseFontSizeCommand::sInstance;
+
+bool DecreaseFontSizeCommand::IsCommandEnabled(Command aCommand,
+                                               EditorBase* aEditorBase) const {
+  HTMLEditor* htmlEditor = HTMLEditor::GetFrom(aEditorBase);
+  if (!htmlEditor) {
+    return false;
+  }
+  // test if we are at min size?
+  return htmlEditor->IsSelectionEditable();
+}
+
+nsresult DecreaseFontSizeCommand::DoCommand(Command aCommand,
+                                            EditorBase& aEditorBase,
+                                            nsIPrincipal* aPrincipal) const {
+  HTMLEditor* htmlEditor = aEditorBase.GetAsHTMLEditor();
+  if (NS_WARN_IF(!htmlEditor)) {
+    return NS_OK;
+  }
+  nsresult rv = MOZ_KnownLive(htmlEditor)->DecreaseFontSizeAsAction(aPrincipal);
+  NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
+                       "HTMLEditor::DecreaseFontSizeAsAction() failed");
+  return rv;
+}
+
+nsresult DecreaseFontSizeCommand::GetCommandStateParams(
+    Command aCommand, nsCommandParams& aParams, EditorBase* aEditorBase,
+    nsIEditingSession* aEditingSession) const {
+  return aParams.SetBool(STATE_ENABLED,
+                         IsCommandEnabled(aCommand, aEditorBase));
+}
+
+/*****************************************************************************
+ * mozilla::InsertHTMLCommand
+ *****************************************************************************/
+
+StaticRefPtr<InsertHTMLCommand> InsertHTMLCommand::sInstance;
+
+bool InsertHTMLCommand::IsCommandEnabled(Command aCommand,
+                                         EditorBase* aEditorBase) const {
+  HTMLEditor* htmlEditor = HTMLEditor::GetFrom(aEditorBase);
+  if (!htmlEditor) {
+    return false;
+  }
+  return htmlEditor->IsSelectionEditable();
+}
+
+nsresult InsertHTMLCommand::DoCommand(Command aCommand, EditorBase& aEditorBase,
+                                      nsIPrincipal* aPrincipal) const {
+  // If InsertHTMLCommand is called with no parameters, it was probably called
+  // with an empty string parameter ''. In this case, it should act the same as
+  // the delete command
+  HTMLEditor* htmlEditor = aEditorBase.GetAsHTMLEditor();
+  if (NS_WARN_IF(!htmlEditor)) {
+    return NS_ERROR_FAILURE;
+  }
+  nsresult rv =
+      MOZ_KnownLive(htmlEditor)->InsertHTMLAsAction(u""_ns, aPrincipal);
+  NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
+                       "HTMLEditor::InsertHTMLAsAction() failed");
+  return rv;
+}
+
+nsresult InsertHTMLCommand::DoCommandParam(Command aCommand,
+                                           const nsAString& aStringParam,
+                                           EditorBase& aEditorBase,
+                                           nsIPrincipal* aPrincipal) const {
+  if (NS_WARN_IF(aStringParam.IsVoid())) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  HTMLEditor* htmlEditor = aEditorBase.GetAsHTMLEditor();
+  if (NS_WARN_IF(!htmlEditor)) {
+    return NS_ERROR_FAILURE;
+  }
+  nsresult rv =
+      MOZ_KnownLive(htmlEditor)->InsertHTMLAsAction(aStringParam, aPrincipal);
+  NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
+                       "HTMLEditor::InsertHTMLAsAction() failed");
+  return rv;
+}
+
+nsresult InsertHTMLCommand::GetCommandStateParams(
+    Command aCommand, nsCommandParams& aParams, EditorBase* aEditorBase,
+    nsIEditingSession* aEditingSession) const {
+  return aParams.SetBool(STATE_ENABLED,
+                         IsCommandEnabled(aCommand, aEditorBase));
+}
+
+/*****************************************************************************
+ * mozilla::InsertTagCommand
+ *****************************************************************************/
+
+StaticRefPtr<InsertTagCommand> InsertTagCommand::sInstance;
+
+bool InsertTagCommand::IsCommandEnabled(Command aCommand,
+                                        EditorBase* aEditorBase) const {
+  HTMLEditor* htmlEditor = HTMLEditor::GetFrom(aEditorBase);
+  if (!htmlEditor) {
+    return false;
+  }
+  return htmlEditor->IsSelectionEditable();
+}
+
+// corresponding STATE_ATTRIBUTE is: src (img) and href (a)
+nsresult InsertTagCommand::DoCommand(Command aCommand, EditorBase& aEditorBase,
+                                     nsIPrincipal* aPrincipal) const {
+  nsAtom* tagName = GetTagName(aCommand);
+  if (NS_WARN_IF(tagName != nsGkAtoms::hr)) {
+    return NS_ERROR_NOT_IMPLEMENTED;
+  }
+
+  HTMLEditor* htmlEditor = aEditorBase.GetAsHTMLEditor();
+  if (NS_WARN_IF(!htmlEditor)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  RefPtr<Element> newElement =
+      MOZ_KnownLive(htmlEditor)
+          ->CreateElementWithDefaults(MOZ_KnownLive(*tagName));
+  if (NS_WARN_IF(!newElement)) {
+    return NS_ERROR_FAILURE;
+  }
+  nsresult rv =
+      MOZ_KnownLive(htmlEditor)
+          ->InsertElementAtSelectionAsAction(newElement, true, aPrincipal);
+  NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
+                       "HTMLEditor::InsertElementAtSelectionAsAction() failed");
+  return rv;
+}
+
+nsresult InsertTagCommand::DoCommandParam(Command aCommand,
+                                          const nsAString& aStringParam,
+                                          EditorBase& aEditorBase,
+                                          nsIPrincipal* aPrincipal) const {
+  MOZ_ASSERT(aCommand != Command::InsertHorizontalRule);
+
+  if (NS_WARN_IF(aStringParam.IsEmpty())) {
+    return NS_ERROR_INVALID_ARG;
+  }
+  nsAtom* tagName = GetTagName(aCommand);
+  if (NS_WARN_IF(!tagName)) {
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  HTMLEditor* htmlEditor = aEditorBase.GetAsHTMLEditor();
+  if (NS_WARN_IF(!htmlEditor)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  // filter out tags we don't know how to insert
+  nsAtom* attribute = nullptr;
+  if (tagName == nsGkAtoms::a) {
+    attribute = nsGkAtoms::href;
+  } else if (tagName == nsGkAtoms::img) {
+    attribute = nsGkAtoms::src;
+  } else {
+    return NS_ERROR_NOT_IMPLEMENTED;
+  }
+
+  RefPtr<Element> newElement =
+      MOZ_KnownLive(htmlEditor)
+          ->CreateElementWithDefaults(MOZ_KnownLive(*tagName));
+  if (!newElement) {
+    NS_WARNING("HTMLEditor::CreateElementWithDefaults() failed");
+    return NS_ERROR_FAILURE;
+  }
+
+  ErrorResult error;
+  newElement->SetAttr(attribute, aStringParam, error);
+  if (error.Failed()) {
+    NS_WARNING("Element::SetAttr() failed");
+    return error.StealNSResult();
+  }
+
+  // do actual insertion
+  if (tagName == nsGkAtoms::a) {
+    nsresult rv =
+        MOZ_KnownLive(htmlEditor)
+            ->InsertLinkAroundSelectionAsAction(newElement, aPrincipal);
+    NS_WARNING_ASSERTION(
+        NS_SUCCEEDED(rv),
+        "HTMLEditor::InsertLinkAroundSelectionAsAction() failed");
+    return rv;
+  }
+
+  nsresult rv =
+      MOZ_KnownLive(htmlEditor)
+          ->InsertElementAtSelectionAsAction(newElement, true, aPrincipal);
+  NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
+                       "HTMLEditor::InsertElementAtSelectionAsAction() failed");
+  return rv;
+}
+
+nsresult InsertTagCommand::GetCommandStateParams(
+    Command aCommand, nsCommandParams& aParams, EditorBase* aEditorBase,
+    nsIEditingSession* aEditingSession) const {
+  return aParams.SetBool(STATE_ENABLED,
+                         IsCommandEnabled(aCommand, aEditorBase));
+}
+
+/*****************************************************************************
+ * Helper methods
+ *****************************************************************************/
+
+static nsresult GetListState(HTMLEditor* aHTMLEditor, bool* aMixed,
+                             nsAString& aLocalName) {
+  MOZ_ASSERT(aHTMLEditor);
+  MOZ_ASSERT(aMixed);
+
+  *aMixed = false;
+  aLocalName.Truncate();
+
+  ErrorResult error;
+  ListElementSelectionState state(*aHTMLEditor, error);
+  if (error.Failed()) {
+    NS_WARNING("ListElementSelectionState failed");
+    return error.StealNSResult();
+  }
+  if (state.IsNotOneTypeListElementSelected()) {
+    *aMixed = true;
+    return NS_OK;
+  }
+
+  if (state.IsOLElementSelected()) {
+    aLocalName.AssignLiteral("ol");
+  } else if (state.IsULElementSelected()) {
+    aLocalName.AssignLiteral("ul");
+  } else if (state.IsDLElementSelected()) {
+    aLocalName.AssignLiteral("dl");
+  }
+  return NS_OK;
+}
+
+}  // namespace mozilla