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gecko-dev/editor/libeditor/TextEditSubActionHandler.cpp

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/* -*- 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 "ErrorList.h"
#include "TextEditor.h"
#include "AutoRangeArray.h"
#include "EditAction.h"
#include "EditorDOMPoint.h"
#include "EditorUtils.h"
#include "HTMLEditor.h"
#include "mozilla/Assertions.h"
#include "mozilla/LookAndFeel.h"
#include "mozilla/Preferences.h"
#include "mozilla/StaticPrefs_editor.h"
#include "mozilla/TextComposition.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/HTMLBRElement.h"
#include "mozilla/dom/NodeFilterBinding.h"
#include "mozilla/dom/NodeIterator.h"
#include "mozilla/dom/Selection.h"
#include "nsAString.h"
#include "nsCOMPtr.h"
#include "nsCRT.h"
#include "nsCRTGlue.h"
#include "nsComponentManagerUtils.h"
#include "nsContentUtils.h"
#include "nsDebug.h"
#include "nsError.h"
#include "nsGkAtoms.h"
#include "nsIContent.h"
#include "nsIHTMLCollection.h"
#include "nsINode.h"
#include "nsISupports.h"
#include "nsLiteralString.h"
#include "nsNameSpaceManager.h"
#include "nsPrintfCString.h"
#include "nsTextNode.h"
#include "nsUnicharUtils.h"
namespace mozilla {
using namespace dom;
#define CANCEL_OPERATION_AND_RETURN_EDIT_ACTION_RESULT_IF_READONLY \
if (IsReadonly()) { \
return EditActionResult::CanceledResult(); \
}
void TextEditor::OnStartToHandleTopLevelEditSubAction(
EditSubAction aTopLevelEditSubAction,
nsIEditor::EDirection aDirectionOfTopLevelEditSubAction, ErrorResult& aRv) {
MOZ_ASSERT(IsEditActionDataAvailable());
MOZ_ASSERT(!aRv.Failed());
EditorBase::OnStartToHandleTopLevelEditSubAction(
aTopLevelEditSubAction, aDirectionOfTopLevelEditSubAction, aRv);
MOZ_ASSERT(GetTopLevelEditSubAction() == aTopLevelEditSubAction);
MOZ_ASSERT(GetDirectionOfTopLevelEditSubAction() ==
aDirectionOfTopLevelEditSubAction);
if (NS_WARN_IF(Destroyed())) {
aRv.Throw(NS_ERROR_EDITOR_DESTROYED);
return;
}
if (NS_WARN_IF(!mInitSucceeded)) {
return;
}
if (aTopLevelEditSubAction == EditSubAction::eSetText) {
// SetText replaces all text, so spell checker handles starting from the
// start of new value.
SetSpellCheckRestartPoint(EditorDOMPoint(mRootElement, 0));
return;
}
if (aTopLevelEditSubAction == EditSubAction::eInsertText ||
aTopLevelEditSubAction == EditSubAction::eInsertTextComingFromIME) {
// For spell checker, previous selected node should be text node if
// possible. If anchor is root of editor, it may become invalid offset
// after inserting text.
const EditorRawDOMPoint point =
FindBetterInsertionPoint(EditorRawDOMPoint(SelectionRef().AnchorRef()));
NS_WARNING_ASSERTION(
point.IsSet(),
"EditorBase::FindBetterInsertionPoint() failed, but ignored");
if (point.IsSet()) {
SetSpellCheckRestartPoint(point);
return;
}
}
if (SelectionRef().AnchorRef().IsSet()) {
SetSpellCheckRestartPoint(EditorRawDOMPoint(SelectionRef().AnchorRef()));
}
}
nsresult TextEditor::OnEndHandlingTopLevelEditSubAction() {
MOZ_ASSERT(IsTopLevelEditSubActionDataAvailable());
nsresult rv;
while (true) {
if (NS_WARN_IF(Destroyed())) {
rv = NS_ERROR_EDITOR_DESTROYED;
break;
}
// XXX Probably, we should spellcheck again after edit action (not top-level
// sub-action) is handled because the ranges can be referred only by
// users.
if (NS_FAILED(rv = HandleInlineSpellCheckAfterEdit())) {
NS_WARNING("TextEditor::HandleInlineSpellCheckAfterEdit() failed");
break;
}
if (!IsSingleLineEditor() &&
NS_FAILED(rv = EnsurePaddingBRElementInMultilineEditor())) {
NS_WARNING(
"EditorBase::EnsurePaddingBRElementInMultilineEditor() failed");
break;
}
rv = EnsureCaretNotAtEndOfTextNode();
if (NS_WARN_IF(rv == NS_ERROR_EDITOR_DESTROYED)) {
break;
}
NS_WARNING_ASSERTION(
NS_SUCCEEDED(rv),
"TextEditor::EnsureCaretNotAtEndOfTextNode() failed, but ignored");
rv = NS_OK;
break;
}
DebugOnly<nsresult> rvIgnored =
EditorBase::OnEndHandlingTopLevelEditSubAction();
NS_WARNING_ASSERTION(
NS_SUCCEEDED(rvIgnored),
"EditorBase::OnEndHandlingTopLevelEditSubAction() failed, but ignored");
MOZ_ASSERT(!GetTopLevelEditSubAction());
MOZ_ASSERT(GetDirectionOfTopLevelEditSubAction() == eNone);
return rv;
}
nsresult TextEditor::InsertLineBreakAsSubAction() {
MOZ_ASSERT(IsEditActionDataAvailable());
if (NS_WARN_IF(!mInitSucceeded)) {
return NS_ERROR_NOT_INITIALIZED;
}
IgnoredErrorResult ignoredError;
AutoEditSubActionNotifier startToHandleEditSubAction(
*this, EditSubAction::eInsertLineBreak, nsIEditor::eNext, ignoredError);
if (NS_WARN_IF(ignoredError.ErrorCodeIs(NS_ERROR_EDITOR_DESTROYED))) {
return ignoredError.StealNSResult();
}
NS_WARNING_ASSERTION(
!ignoredError.Failed(),
"TextEditor::OnStartToHandleTopLevelEditSubAction() failed, but ignored");
Result<EditActionResult, nsresult> result =
InsertLineFeedCharacterAtSelection();
if (MOZ_UNLIKELY(result.isErr())) {
NS_WARNING(
"TextEditor::InsertLineFeedCharacterAtSelection() failed, but ignored");
return result.unwrapErr();
}
return NS_OK;
}
Result<EditActionResult, nsresult>
TextEditor::InsertLineFeedCharacterAtSelection() {
MOZ_ASSERT(IsEditActionDataAvailable());
MOZ_ASSERT(!IsSingleLineEditor());
UndefineCaretBidiLevel();
CANCEL_OPERATION_AND_RETURN_EDIT_ACTION_RESULT_IF_READONLY
if (mMaxTextLength >= 0) {
nsAutoString insertionString(u"\n"_ns);
Result<EditActionResult, nsresult> result =
MaybeTruncateInsertionStringForMaxLength(insertionString);
if (MOZ_UNLIKELY(result.isErr())) {
NS_WARNING(
"TextEditor::MaybeTruncateInsertionStringForMaxLength() failed");
return result;
}
if (result.inspect().Handled()) {
// Don't return as handled since we stopped inserting the line break.
return EditActionResult::CanceledResult();
}
}
// if the selection isn't collapsed, delete it.
if (!SelectionRef().IsCollapsed()) {
nsresult rv =
DeleteSelectionAsSubAction(nsIEditor::eNone, nsIEditor::eNoStrip);
if (NS_FAILED(rv)) {
NS_WARNING(
"EditorBase::DeleteSelectionAsSubAction(eNone, eNoStrip) failed");
return Err(rv);
}
}
const auto pointToInsert = GetFirstSelectionStartPoint<EditorDOMPoint>();
if (NS_WARN_IF(!pointToInsert.IsSet())) {
return Err(NS_ERROR_FAILURE);
}
MOZ_ASSERT(pointToInsert.IsSetAndValid());
MOZ_ASSERT(!pointToInsert.IsContainerHTMLElement(nsGkAtoms::br));
RefPtr<Document> document = GetDocument();
if (NS_WARN_IF(!document)) {
return Err(NS_ERROR_NOT_INITIALIZED);
}
// Insert a linefeed character.
Result<InsertTextResult, nsresult> insertTextResult =
InsertTextWithTransaction(*document, u"\n"_ns, pointToInsert);
if (MOZ_UNLIKELY(insertTextResult.isErr())) {
NS_WARNING("TextEditor::InsertTextWithTransaction(\"\\n\") failed");
return insertTextResult.propagateErr();
}
insertTextResult.inspect().IgnoreCaretPointSuggestion();
EditorDOMPoint pointToPutCaret = insertTextResult.inspect().Handled()
? insertTextResult.inspect()
.EndOfInsertedTextRef()
.To<EditorDOMPoint>()
: pointToInsert;
if (NS_WARN_IF(!pointToPutCaret.IsSetAndValid())) {
return Err(NS_ERROR_FAILURE);
}
// XXX I don't think we still need this. This must have been required when
// `<textarea>` was implemented with text nodes and `<br>` elements.
// We want the caret to stick to the content on the "right". We want the
// caret to stick to whatever is past the break. This is because the break is
// on the same line we were on, but the next content will be on the following
// line.
pointToPutCaret.SetInterlinePosition(InterlinePosition::StartOfNextLine);
nsresult rv = CollapseSelectionTo(pointToPutCaret);
if (NS_FAILED(rv)) {
NS_WARNING("EditorBase::CollapseSelectionTo() failed");
return Err(rv);
}
return EditActionResult::HandledResult();
}
nsresult TextEditor::EnsureCaretNotAtEndOfTextNode() {
MOZ_ASSERT(IsEditActionDataAvailable());
// If there is no selection ranges, we should set to the end of the editor.
// This is usually performed in InitEditorContentAndSelection(), however,
// if the editor is reframed, this may be called by
// OnEndHandlingTopLevelEditSubAction().
if (SelectionRef().RangeCount()) {
return NS_OK;
}
nsresult rv = CollapseSelectionToEndOfTextNode();
if (MOZ_UNLIKELY(rv == NS_ERROR_EDITOR_DESTROYED)) {
NS_WARNING(
"TextEditor::CollapseSelectionToEndOfTextNode() caused destroying the "
"editor");
return NS_ERROR_EDITOR_DESTROYED;
}
NS_WARNING_ASSERTION(
NS_SUCCEEDED(rv),
"TextEditor::CollapseSelectionToEndOfTextNode() failed, but ignored");
return NS_OK;
}
void TextEditor::HandleNewLinesInStringForSingleLineEditor(
nsString& aString) const {
static const char16_t kLF = static_cast<char16_t>('\n');
MOZ_ASSERT(IsEditActionDataAvailable());
MOZ_ASSERT(aString.FindChar(static_cast<uint16_t>('\r')) == kNotFound);
// First of all, check if aString contains '\n' since if the string
// does not include it, we don't need to do nothing here.
int32_t firstLF = aString.FindChar(kLF, 0);
if (firstLF == kNotFound) {
return;
}
switch (mNewlineHandling) {
case nsIEditor::eNewlinesReplaceWithSpaces:
// Default of Firefox:
// Strip trailing newlines first so we don't wind up with trailing spaces
aString.Trim(LFSTR, false, true);
aString.ReplaceChar(kLF, ' ');
break;
case nsIEditor::eNewlinesStrip:
aString.StripChar(kLF);
break;
case nsIEditor::eNewlinesPasteToFirst:
default: {
// we get first *non-empty* line.
int32_t offset = 0;
while (firstLF == offset) {
offset++;
firstLF = aString.FindChar(kLF, offset);
}
if (firstLF > 0) {
aString.Truncate(firstLF);
}
if (offset > 0) {
aString.Cut(0, offset);
}
break;
}
case nsIEditor::eNewlinesReplaceWithCommas:
// Default of Thunderbird:
aString.Trim(LFSTR, true, true);
aString.ReplaceChar(kLF, ',');
break;
case nsIEditor::eNewlinesStripSurroundingWhitespace: {
nsAutoString result;
uint32_t offset = 0;
while (offset < aString.Length()) {
int32_t nextLF = !offset ? firstLF : aString.FindChar(kLF, offset);
if (nextLF < 0) {
result.Append(nsDependentSubstring(aString, offset));
break;
}
uint32_t wsBegin = nextLF;
// look backwards for the first non-white-space char
while (wsBegin > offset && NS_IS_SPACE(aString[wsBegin - 1])) {
--wsBegin;
}
result.Append(nsDependentSubstring(aString, offset, wsBegin - offset));
offset = nextLF + 1;
while (offset < aString.Length() && NS_IS_SPACE(aString[offset])) {
++offset;
}
}
aString = result;
break;
}
case nsIEditor::eNewlinesPasteIntact:
// even if we're pasting newlines, don't paste leading/trailing ones
aString.Trim(LFSTR, true, true);
break;
}
}
Result<EditActionResult, nsresult> TextEditor::HandleInsertText(
EditSubAction aEditSubAction, const nsAString& aInsertionString,
SelectionHandling aSelectionHandling) {
MOZ_ASSERT(IsEditActionDataAvailable());
MOZ_ASSERT(aEditSubAction == EditSubAction::eInsertText ||
aEditSubAction == EditSubAction::eInsertTextComingFromIME);
MOZ_ASSERT_IF(aSelectionHandling == SelectionHandling::Ignore,
aEditSubAction == EditSubAction::eInsertTextComingFromIME);
UndefineCaretBidiLevel();
if (aInsertionString.IsEmpty() &&
aEditSubAction != EditSubAction::eInsertTextComingFromIME) {
// HACK: this is a fix for bug 19395
// I can't outlaw all empty insertions
// because IME transaction depend on them
// There is more work to do to make the
// world safe for IME.
return EditActionResult::CanceledResult();
}
nsAutoString insertionString(aInsertionString);
if (mMaxTextLength >= 0) {
Result<EditActionResult, nsresult> result =
MaybeTruncateInsertionStringForMaxLength(insertionString);
if (MOZ_UNLIKELY(result.isErr())) {
NS_WARNING(
"TextEditor::MaybeTruncateInsertionStringForMaxLength() failed");
EditActionResult unwrappedResult = result.unwrap();
unwrappedResult.MarkAsHandled();
return unwrappedResult;
}
// If we're exceeding the maxlength when composing IME, we need to clean up
// the composing text, so we shouldn't return early.
if (result.inspect().Handled() && insertionString.IsEmpty() &&
aEditSubAction != EditSubAction::eInsertTextComingFromIME) {
return EditActionResult::CanceledResult();
}
}
uint32_t start = 0;
if (IsPasswordEditor()) {
if (GetComposition() && !GetComposition()->String().IsEmpty()) {
start = GetComposition()->XPOffsetInTextNode();
} else {
uint32_t end = 0;
nsContentUtils::GetSelectionInTextControl(&SelectionRef(), GetRoot(),
start, end);
}
}
// if the selection isn't collapsed, delete it.
if (!SelectionRef().IsCollapsed() &&
aSelectionHandling == SelectionHandling::Delete) {
nsresult rv =
DeleteSelectionAsSubAction(nsIEditor::eNone, nsIEditor::eNoStrip);
if (NS_FAILED(rv)) {
NS_WARNING(
"EditorBase::DeleteSelectionAsSubAction(eNone, eNoStrip) failed");
return Err(rv);
}
}
// XXX Why don't we cancel here? Shouldn't we do this first?
CANCEL_OPERATION_AND_RETURN_EDIT_ACTION_RESULT_IF_READONLY
MaybeDoAutoPasswordMasking();
// People have lots of different ideas about what text fields
// should do with multiline pastes. See bugs 21032, 23485, 23485, 50935.
// The six possible options are:
// 0. paste newlines intact
// 1. paste up to the first newline (default)
// 2. replace newlines with spaces
// 3. strip newlines
// 4. replace with commas
// 5. strip newlines and surrounding white-space
// So find out what we're expected to do:
if (IsSingleLineEditor()) {
// XXX Some callers of TextEditor::InsertTextAsAction() already make the
// string use only \n as a linebreaker. However, they are not hot
// path and nsContentUtils::PlatformToDOMLineBreaks() does nothing
// if the string doesn't include \r. So, let's convert linebreakers
// here. Note that there are too many callers of
// TextEditor::InsertTextAsAction(). So, it's difficult to keep
// maintaining all of them won't reach here without \r nor \r\n.
// XXX Should we handle do this before truncating the string for
// `maxlength`?
nsContentUtils::PlatformToDOMLineBreaks(insertionString);
HandleNewLinesInStringForSingleLineEditor(insertionString);
}
const auto atStartOfSelection = GetFirstSelectionStartPoint<EditorDOMPoint>();
if (NS_WARN_IF(!atStartOfSelection.IsSetAndValid())) {
return Err(NS_ERROR_FAILURE);
}
MOZ_ASSERT(!atStartOfSelection.IsContainerHTMLElement(nsGkAtoms::br));
RefPtr<Document> document = GetDocument();
if (NS_WARN_IF(!document)) {
return Err(NS_ERROR_NOT_INITIALIZED);
}
if (aEditSubAction == EditSubAction::eInsertTextComingFromIME) {
EditorDOMPoint compositionStartPoint =
GetFirstIMESelectionStartPoint<EditorDOMPoint>();
if (!compositionStartPoint.IsSet()) {
compositionStartPoint = FindBetterInsertionPoint(atStartOfSelection);
NS_WARNING_ASSERTION(
compositionStartPoint.IsSet(),
"EditorBase::FindBetterInsertionPoint() failed, but ignored");
}
Result<InsertTextResult, nsresult> insertTextResult =
InsertTextWithTransaction(*document, insertionString,
compositionStartPoint);
if (MOZ_UNLIKELY(insertTextResult.isErr())) {
NS_WARNING("EditorBase::InsertTextWithTransaction() failed");
return insertTextResult.propagateErr();
}
nsresult rv = insertTextResult.unwrap().SuggestCaretPointTo(
*this, {SuggestCaret::OnlyIfHasSuggestion,
SuggestCaret::OnlyIfTransactionsAllowedToDoIt,
SuggestCaret::AndIgnoreTrivialError});
if (NS_FAILED(rv)) {
NS_WARNING("CaretPoint::SuggestCaretPointTo() failed");
return Err(rv);
}
NS_WARNING_ASSERTION(
rv != NS_SUCCESS_EDITOR_BUT_IGNORED_TRIVIAL_ERROR,
"CaretPoint::SuggestCaretPointTo() failed, but ignored");
} else {
MOZ_ASSERT(aEditSubAction == EditSubAction::eInsertText);
Result<InsertTextResult, nsresult> insertTextResult =
InsertTextWithTransaction(*document, insertionString,
atStartOfSelection);
if (MOZ_UNLIKELY(insertTextResult.isErr())) {
NS_WARNING("EditorBase::InsertTextWithTransaction() failed");
return insertTextResult.propagateErr();
}
// Ignore caret suggestion because there was
// AutoTransactionsConserveSelection.
insertTextResult.inspect().IgnoreCaretPointSuggestion();
if (insertTextResult.inspect().Handled()) {
// Make the caret attach to the inserted text, unless this text ends with
// a LF, in which case make the caret attach to the next line.
const bool endsWithLF =
!insertionString.IsEmpty() && insertionString.Last() == nsCRT::LF;
EditorDOMPoint pointToPutCaret = insertTextResult.inspect()
.EndOfInsertedTextRef()
.To<EditorDOMPoint>();
pointToPutCaret.SetInterlinePosition(
endsWithLF ? InterlinePosition::StartOfNextLine
: InterlinePosition::EndOfLine);
MOZ_ASSERT(pointToPutCaret.IsInTextNode(),
"After inserting text into a text node, insertTextResult "
"should return a point in a text node");
nsresult rv = CollapseSelectionTo(pointToPutCaret);
if (NS_WARN_IF(rv == NS_ERROR_EDITOR_DESTROYED)) {
return Err(NS_ERROR_EDITOR_DESTROYED);
}
NS_WARNING_ASSERTION(
NS_SUCCEEDED(rv),
"EditorBase::CollapseSelectionTo() failed, but ignored");
}
}
// Unmask inputted character(s) if necessary.
if (IsPasswordEditor() && IsMaskingPassword() && CanEchoPasswordNow()) {
nsresult rv = SetUnmaskRangeAndNotify(start, insertionString.Length(),
LookAndFeel::GetPasswordMaskDelay());
if (NS_FAILED(rv)) {
NS_WARNING("TextEditor::SetUnmaskRangeAndNotify() failed");
return Err(rv);
}
return EditActionResult::HandledResult();
}
return EditActionResult::HandledResult();
}
Result<EditActionResult, nsresult> TextEditor::SetTextWithoutTransaction(
const nsAString& aValue) {
MOZ_ASSERT(IsEditActionDataAvailable());
MOZ_ASSERT(!IsIMEComposing());
MOZ_ASSERT(!IsUndoRedoEnabled());
MOZ_ASSERT(GetEditAction() != EditAction::eReplaceText);
MOZ_ASSERT(mMaxTextLength < 0);
MOZ_ASSERT(aValue.FindChar(static_cast<char16_t>('\r')) == kNotFound);
UndefineCaretBidiLevel();
// XXX If we're setting value, shouldn't we keep setting the new value here?
CANCEL_OPERATION_AND_RETURN_EDIT_ACTION_RESULT_IF_READONLY
MaybeDoAutoPasswordMasking();
RefPtr<Element> anonymousDivElement = GetRoot();
RefPtr<Text> textNode =
Text::FromNodeOrNull(anonymousDivElement->GetFirstChild());
MOZ_ASSERT(textNode);
// We can use this fast path only when:
// - we need to insert a text node.
// - we need to replace content of existing text node.
// Additionally, for avoiding odd result, we should check whether we're in
// usual condition.
if (!IsSingleLineEditor()) {
// If we're a multiline text editor, i.e., <textarea>, there is a padding
// <br> element for empty last line followed by scrollbar/resizer elements.
// Otherwise, a text node is followed by them.
if (!textNode->GetNextSibling() ||
!EditorUtils::IsPaddingBRElementForEmptyLastLine(
*textNode->GetNextSibling())) {
return EditActionResult::IgnoredResult();
}
}
// XXX Password fields accept line breaks as normal characters with this code.
// Is this intentional?
nsAutoString sanitizedValue(aValue);
if (IsSingleLineEditor() && !IsPasswordEditor()) {
HandleNewLinesInStringForSingleLineEditor(sanitizedValue);
}
nsresult rv = SetTextNodeWithoutTransaction(sanitizedValue, *textNode);
if (NS_FAILED(rv)) {
NS_WARNING("EditorBase::SetTextNodeWithoutTransaction() failed");
return Err(rv);
}
return EditActionResult::HandledResult();
}
Result<EditActionResult, nsresult> TextEditor::HandleDeleteSelection(
nsIEditor::EDirection aDirectionAndAmount,
nsIEditor::EStripWrappers aStripWrappers) {
MOZ_ASSERT(IsEditActionDataAvailable());
MOZ_ASSERT(aStripWrappers == nsIEditor::eNoStrip);
UndefineCaretBidiLevel();
CANCEL_OPERATION_AND_RETURN_EDIT_ACTION_RESULT_IF_READONLY
if (IsEmpty()) {
return EditActionResult::CanceledResult();
}
Result<EditActionResult, nsresult> result =
HandleDeleteSelectionInternal(aDirectionAndAmount, nsIEditor::eNoStrip);
// HandleDeleteSelectionInternal() creates SelectionBatcher. Therefore,
// quitting from it might cause having destroyed the editor.
if (NS_WARN_IF(Destroyed())) {
return Err(NS_ERROR_EDITOR_DESTROYED);
}
NS_WARNING_ASSERTION(
result.isOk(),
"TextEditor::HandleDeleteSelectionInternal(eNoStrip) failed");
return result;
}
Result<EditActionResult, nsresult> TextEditor::HandleDeleteSelectionInternal(
nsIEditor::EDirection aDirectionAndAmount,
nsIEditor::EStripWrappers aStripWrappers) {
MOZ_ASSERT(IsEditActionDataAvailable());
MOZ_ASSERT(aStripWrappers == nsIEditor::eNoStrip);
// If the current selection is empty (e.g the user presses backspace with
// a collapsed selection), then we want to avoid sending the selectstart
// event to the user, so we hide selection changes. However, we still
// want to send a single selectionchange event to the document, so we
// batch the selectionchange events, such that a single event fires after
// the AutoHideSelectionChanges destructor has been run.
SelectionBatcher selectionBatcher(SelectionRef(), __FUNCTION__);
AutoHideSelectionChanges hideSelection(SelectionRef());
nsAutoScriptBlocker scriptBlocker;
if (IsPasswordEditor() && IsMaskingPassword()) {
MaskAllCharacters();
} else {
const auto selectionStartPoint =
GetFirstSelectionStartPoint<EditorRawDOMPoint>();
if (NS_WARN_IF(!selectionStartPoint.IsSet())) {
return Err(NS_ERROR_FAILURE);
}
if (!SelectionRef().IsCollapsed()) {
nsresult rv = DeleteSelectionWithTransaction(aDirectionAndAmount,
nsIEditor::eNoStrip);
if (NS_FAILED(rv)) {
NS_WARNING(
"EditorBase::DeleteSelectionWithTransaction(eNoStrip) failed");
return Err(rv);
}
return EditActionResult::HandledResult();
}
// Test for distance between caret and text that will be deleted
AutoCaretBidiLevelManager bidiLevelManager(*this, aDirectionAndAmount,
selectionStartPoint);
if (MOZ_UNLIKELY(bidiLevelManager.Failed())) {
NS_WARNING("EditorBase::AutoCaretBidiLevelManager() failed");
return Err(NS_ERROR_FAILURE);
}
bidiLevelManager.MaybeUpdateCaretBidiLevel(*this);
if (bidiLevelManager.Canceled()) {
return EditActionResult::CanceledResult();
}
}
AutoRangeArray rangesToDelete(SelectionRef());
Result<nsIEditor::EDirection, nsresult> result =
rangesToDelete.ExtendAnchorFocusRangeFor(*this, aDirectionAndAmount);
if (result.isErr()) {
NS_WARNING("AutoRangeArray::ExtendAnchorFocusRangeFor() failed");
return result.propagateErr();
}
if (const Text* theTextNode = GetTextNode()) {
rangesToDelete.EnsureRangesInTextNode(*theTextNode);
}
Result<CaretPoint, nsresult> caretPointOrError = DeleteRangesWithTransaction(
result.unwrap(), nsIEditor::eNoStrip, rangesToDelete);
if (MOZ_UNLIKELY(caretPointOrError.isErr())) {
NS_WARNING("EditorBase::DeleteRangesWithTransaction(eNoStrip) failed");
return caretPointOrError.propagateErr();
}
nsresult rv = caretPointOrError.inspect().SuggestCaretPointTo(
*this, {SuggestCaret::OnlyIfHasSuggestion,
SuggestCaret::OnlyIfTransactionsAllowedToDoIt,
SuggestCaret::AndIgnoreTrivialError});
if (NS_FAILED(rv)) {
NS_WARNING("CaretPoint::SuggestCaretPointTo() failed");
return Err(rv);
}
NS_WARNING_ASSERTION(rv != NS_SUCCESS_EDITOR_BUT_IGNORED_TRIVIAL_ERROR,
"CaretPoint::SuggestCaretPointTo() failed, but ignored");
return EditActionResult::HandledResult();
}
Result<EditActionResult, nsresult>
TextEditor::ComputeValueFromTextNodeAndBRElement(nsAString& aValue) const {
MOZ_ASSERT(IsEditActionDataAvailable());
MOZ_ASSERT(!IsHTMLEditor());
Element* anonymousDivElement = GetRoot();
if (MOZ_UNLIKELY(!anonymousDivElement)) {
// Don't warn this case, this is possible, e.g., 997805.html
aValue.Truncate();
return EditActionResult::HandledResult();
}
Text* textNode = Text::FromNodeOrNull(anonymousDivElement->GetFirstChild());
MOZ_ASSERT(textNode);
if (!textNode->Length()) {
aValue.Truncate();
return EditActionResult::HandledResult();
}
nsIContent* firstChildExceptText = textNode->GetNextSibling();
// If the DOM tree is unexpected, fall back to the expensive path.
bool isInput = IsSingleLineEditor();
bool isTextarea = !isInput;
if (NS_WARN_IF(isInput && firstChildExceptText) ||
NS_WARN_IF(isTextarea && !firstChildExceptText) ||
NS_WARN_IF(isTextarea &&
!EditorUtils::IsPaddingBRElementForEmptyLastLine(
*firstChildExceptText) &&
!firstChildExceptText->IsXULElement(nsGkAtoms::scrollbar))) {
return EditActionResult::IgnoredResult();
}
// Otherwise, the text data is the value.
textNode->GetData(aValue);
return EditActionResult::HandledResult();
}
Result<EditActionResult, nsresult>
TextEditor::MaybeTruncateInsertionStringForMaxLength(
nsAString& aInsertionString) {
MOZ_ASSERT(IsEditActionDataAvailable());
MOZ_ASSERT(mMaxTextLength >= 0);
if (IsIMEComposing()) {
return EditActionResult::IgnoredResult();
}
// Ignore user pastes
switch (GetEditAction()) {
case EditAction::ePaste:
case EditAction::ePasteAsQuotation:
case EditAction::eDrop:
case EditAction::eReplaceText:
// EditActionPrinciple() is non-null iff the edit was requested by
// javascript.
if (!GetEditActionPrincipal()) {
// By now we are certain that this is a user paste, before we ignore it,
// lets check if the user explictly enabled truncating user pastes.
if (!StaticPrefs::editor_truncate_user_pastes()) {
return EditActionResult::IgnoredResult();
}
}
[[fallthrough]];
default:
break;
}
uint32_t currentLength = UINT32_MAX;
nsresult rv = GetTextLength(&currentLength);
if (NS_FAILED(rv)) {
NS_WARNING("TextEditor::GetTextLength() failed");
return Err(rv);
}
uint32_t selectionStart, selectionEnd;
nsContentUtils::GetSelectionInTextControl(&SelectionRef(), GetRoot(),
selectionStart, selectionEnd);
TextComposition* composition = GetComposition();
const uint32_t kOldCompositionStringLength =
composition ? composition->String().Length() : 0;
const uint32_t kSelectionLength = selectionEnd - selectionStart;
// XXX This computation must be wrong. If we'll support non-collapsed
// selection even during composition for Korean IME, kSelectionLength
// is part of kOldCompositionStringLength.
const uint32_t kNewLength =
currentLength - kSelectionLength - kOldCompositionStringLength;
if (kNewLength >= AssertedCast<uint32_t>(mMaxTextLength)) {
aInsertionString.Truncate(); // Too long, we cannot accept new character.
return EditActionResult::HandledResult();
}
if (aInsertionString.Length() + kNewLength <=
AssertedCast<uint32_t>(mMaxTextLength)) {
return EditActionResult::IgnoredResult(); // Enough short string.
}
int32_t newInsertionStringLength = mMaxTextLength - kNewLength;
MOZ_ASSERT(newInsertionStringLength > 0);
char16_t maybeHighSurrogate =
aInsertionString.CharAt(newInsertionStringLength - 1);
char16_t maybeLowSurrogate =
aInsertionString.CharAt(newInsertionStringLength);
// Don't split the surrogate pair.
if (NS_IS_SURROGATE_PAIR(maybeHighSurrogate, maybeLowSurrogate)) {
newInsertionStringLength--;
}
// XXX What should we do if we're removing IVS but its preceding
// character won't be removed?
aInsertionString.Truncate(newInsertionStringLength);
return EditActionResult::HandledResult();
}
bool TextEditor::CanEchoPasswordNow() const {
if (!LookAndFeel::GetEchoPassword() || EchoingPasswordPrevented()) {
return false;
}
return GetEditAction() != EditAction::eDrop &&
GetEditAction() != EditAction::ePaste;
}
} // namespace mozilla
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