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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 "TextEditor.h"
#include "mozilla/Assertions.h"
#include "mozilla/EditAction.h"
#include "mozilla/EditorDOMPoint.h"
#include "mozilla/EditorUtils.h"
#include "mozilla/HTMLEditor.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 "nsISupportsBase.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 EditActionCanceled(NS_OK); \
}
nsresult TextEditor::InitEditorContentAndSelection() {
MOZ_ASSERT(IsEditActionDataAvailable());
nsresult rv = MaybeCreatePaddingBRElementForEmptyEditor();
if (NS_FAILED(rv)) {
NS_WARNING(
"EditorBase::MaybeCreatePaddingBRElementForEmptyEditor() failed");
return rv;
}
// If the selection hasn't been set up yet, set it up collapsed to the end of
// our editable content.
// XXX I think that this shouldn't do it in `HTMLEditor` because it maybe
// removed by the web app and if they call `Selection::AddRange()`,
// it may cause multiple selection ranges.
if (!SelectionRefPtr()->RangeCount()) {
nsresult rv = CollapseSelectionToEnd();
if (NS_FAILED(rv)) {
NS_WARNING("EditorBase::CollapseSelectionToEnd() failed");
return rv;
}
}
if (IsPlaintextEditor() && !IsSingleLineEditor()) {
nsresult rv = EnsurePaddingBRElementInMultilineEditor();
if (NS_FAILED(rv)) {
NS_WARNING(
"TextEditor::EnsurePaddingBRElementInMultilineEditor() failed");
return rv;
}
}
return NS_OK;
}
void TextEditor::OnStartToHandleTopLevelEditSubAction(
EditSubAction aTopLevelEditSubAction,
nsIEditor::EDirection aDirectionOfTopLevelEditSubAction, ErrorResult& aRv) {
MOZ_ASSERT(IsEditActionDataAvailable());
MOZ_ASSERT(!AsHTMLEditor());
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.
EditorRawDOMPoint point = FindBetterInsertionPoint(
EditorRawDOMPoint(SelectionRefPtr()->AnchorRef()));
NS_WARNING_ASSERTION(
point.IsSet(),
"EditorBase::FindBetterInsertionPoint() failed, but ignored");
if (point.IsSet()) {
SetSpellCheckRestartPoint(point);
return;
}
}
if (SelectionRefPtr()->AnchorRef().IsSet()) {
SetSpellCheckRestartPoint(
EditorRawDOMPoint(SelectionRefPtr()->AnchorRef()));
}
}
nsresult TextEditor::OnEndHandlingTopLevelEditSubAction() {
MOZ_ASSERT(IsTopLevelEditSubActionDataAvailable());
MOZ_ASSERT(!AsHTMLEditor());
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 (NS_FAILED(rv = EnsurePaddingBRElementForEmptyEditor())) {
NS_WARNING("TextEditor::EnsurePaddingBRElementForEmptyEditor() failed");
break;
}
if (!IsSingleLineEditor() &&
NS_FAILED(rv = EnsurePaddingBRElementInMultilineEditor())) {
NS_WARNING(
"TextEditor::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;
}
EditActionResult TextEditor::InsertLineFeedCharacterAtSelection() {
MOZ_ASSERT(IsEditActionDataAvailable());
MOZ_ASSERT(IsTextEditor());
MOZ_ASSERT(!IsSingleLineEditor());
UndefineCaretBidiLevel();
CANCEL_OPERATION_AND_RETURN_EDIT_ACTION_RESULT_IF_READONLY
if (mMaxTextLength >= 0) {
nsAutoString insertionString(NS_LITERAL_STRING("\n"));
EditActionResult result =
MaybeTruncateInsertionStringForMaxLength(insertionString);
if (result.Failed()) {
NS_WARNING(
"TextEditor::MaybeTruncateInsertionStringForMaxLength() failed");
return result;
}
if (result.Handled()) {
// Don't return as handled since we stopped inserting the line break.
return EditActionCanceled();
}
}
// if the selection isn't collapsed, delete it.
if (!SelectionRefPtr()->IsCollapsed()) {
nsresult rv =
DeleteSelectionAsSubAction(nsIEditor::eNone, nsIEditor::eNoStrip);
if (NS_FAILED(rv)) {
NS_WARNING(
"EditorBase::DeleteSelectionAsSubAction(eNone, eNoStrip) failed");
return EditActionIgnored(rv);
}
}
nsresult rv = EnsureNoPaddingBRElementForEmptyEditor();
if (NS_FAILED(rv)) {
NS_WARNING("EditorBase::EnsureNoPaddingBRElementForEmptyEditor() failed");
return EditActionIgnored(rv);
}
// get the (collapsed) selection location
nsRange* firstRange = SelectionRefPtr()->GetRangeAt(0);
if (NS_WARN_IF(!firstRange)) {
return EditActionIgnored(NS_ERROR_FAILURE);
}
EditorRawDOMPoint pointToInsert(firstRange->StartRef());
if (NS_WARN_IF(!pointToInsert.IsSet())) {
return EditActionIgnored(NS_ERROR_FAILURE);
}
MOZ_ASSERT(pointToInsert.IsSetAndValid());
MOZ_ASSERT(!pointToInsert.IsContainerHTMLElement(nsGkAtoms::br));
RefPtr<Document> document = GetDocument();
if (NS_WARN_IF(!document)) {
return EditActionIgnored(NS_ERROR_NOT_INITIALIZED);
}
// Don't change my selection in sub-transactions.
AutoTransactionsConserveSelection dontChangeMySelection(*this);
// Insert a linefeed character.
EditorRawDOMPoint pointAfterInsertedLineFeed;
rv = InsertTextWithTransaction(*document, NS_LITERAL_STRING("\n"),
pointToInsert, &pointAfterInsertedLineFeed);
if (!pointAfterInsertedLineFeed.IsSet()) {
NS_WARNING(
"EditorBase::InsertTextWithTransaction(\\n) didn't return position of "
"inserted linefeed");
return EditActionIgnored(NS_ERROR_FAILURE);
}
if (NS_FAILED(rv)) {
NS_WARNING("TextEditor::InsertTextWithTransaction(\\n) failed");
return EditActionIgnored(rv);
}
// set the selection to the correct location
MOZ_ASSERT(
!pointAfterInsertedLineFeed.GetChild(),
"After inserting text into a text node, pointAfterInsertedLineFeed."
"GetChild() should be nullptr");
rv = SelectionRefPtr()->Collapse(pointAfterInsertedLineFeed);
if (NS_FAILED(rv)) {
NS_WARNING("Selection::Collapse() failed");
return EditActionIgnored(rv);
}
// XXX I don't think we still need this. This must have been required when
// `<textarea>` was implemented with text nodes and `<br>` elements.
// see if we're at the end of the editor range
EditorRawDOMPoint endPoint(EditorBase::GetEndPoint(*SelectionRefPtr()));
if (endPoint == pointAfterInsertedLineFeed) {
// SetInterlinePosition(true) means 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.
IgnoredErrorResult ignoredError;
SelectionRefPtr()->SetInterlinePosition(true, ignoredError);
NS_WARNING_ASSERTION(
!ignoredError.Failed(),
"Selection::SetInterlinePosition(true) failed, but ignored");
}
return EditActionHandled();
}
nsresult TextEditor::EnsureCaretNotAtEndOfTextNode() {
MOZ_ASSERT(IsEditActionDataAvailable());
MOZ_ASSERT(IsPlaintextEditor());
// 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 (!SelectionRefPtr()->RangeCount()) {
DebugOnly<nsresult> rvIgnored = CollapseSelectionToEnd();
if (NS_WARN_IF(Destroyed())) {
return NS_ERROR_EDITOR_DESTROYED;
}
NS_WARNING_ASSERTION(
NS_SUCCEEDED(rvIgnored),
"EditorBase::CollapseSelectionToEnd() failed, but ignored");
}
// If we are at the end of the <textarea> element, we need to set the
// selection to stick to the padding <br> element for empty last line at the
// end of the <textarea>.
EditorRawDOMPoint selectionStartPoint(
EditorBase::GetStartPoint(*SelectionRefPtr()));
if (NS_WARN_IF(!selectionStartPoint.IsSet())) {
return NS_ERROR_FAILURE;
}
// Nothing to do if we're not at the end of the text node.
if (!selectionStartPoint.IsInTextNode() ||
!selectionStartPoint.IsEndOfContainer()) {
return NS_OK;
}
Element* anonymousDivElement = GetRoot();
if (NS_WARN_IF(!anonymousDivElement)) {
return NS_ERROR_NULL_POINTER;
}
nsINode* parentNode = selectionStartPoint.GetContainer()->GetParentNode();
if (parentNode != anonymousDivElement) {
return NS_OK;
}
nsIContent* nextContent =
selectionStartPoint.GetContainer()->GetNextSibling();
if (!nextContent ||
!EditorUtils::IsPaddingBRElementForEmptyLastLine(*nextContent)) {
return NS_OK;
}
EditorRawDOMPoint afterStartContainer(
EditorRawDOMPoint::After(*selectionStartPoint.GetContainer()));
if (NS_WARN_IF(!afterStartContainer.IsSet())) {
return NS_ERROR_FAILURE;
}
IgnoredErrorResult ignoredError;
SelectionRefPtr()->Collapse(afterStartContainer, ignoredError);
if (NS_WARN_IF(Destroyed())) {
return NS_ERROR_EDITOR_DESTROYED;
}
NS_WARNING_ASSERTION(!ignoredError.Failed(), "Selection::Collapse() failed");
return ignoredError.StealNSResult();
}
void TextEditor::HandleNewLinesInStringForSingleLineEditor(
nsString& aString) const {
static const char16_t kLF = static_cast<char16_t>('\n');
MOZ_ASSERT(IsEditActionDataAvailable());
MOZ_ASSERT(IsPlaintextEditor());
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-whitespace 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;
}
}
EditActionResult TextEditor::HandleInsertText(
EditSubAction aEditSubAction, const nsAString& aInsertionString) {
MOZ_ASSERT(IsEditActionDataAvailable());
MOZ_ASSERT(IsTextEditor());
MOZ_ASSERT(aEditSubAction == EditSubAction::eInsertText ||
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 EditActionCanceled();
}
nsAutoString insertionString(aInsertionString);
if (mMaxTextLength >= 0) {
EditActionResult result =
MaybeTruncateInsertionStringForMaxLength(insertionString);
if (result.Failed()) {
NS_WARNING(
"TextEditor::MaybeTruncateInsertionStringForMaxLength() failed");
return result.MarkAsHandled();
}
// 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.Handled() && insertionString.IsEmpty() &&
aEditSubAction != EditSubAction::eInsertTextComingFromIME) {
return EditActionCanceled();
}
}
uint32_t start = 0;
if (IsPasswordEditor()) {
if (GetComposition() && !GetComposition()->String().IsEmpty()) {
start = GetComposition()->XPOffsetInTextNode();
} else {
uint32_t end = 0;
nsContentUtils::GetSelectionInTextControl(SelectionRefPtr(), GetRoot(),
start, end);
}
}
// if the selection isn't collapsed, delete it.
if (!SelectionRefPtr()->IsCollapsed()) {
nsresult rv =
DeleteSelectionAsSubAction(nsIEditor::eNone, nsIEditor::eNoStrip);
if (NS_FAILED(rv)) {
NS_WARNING(
"EditorBase::DeleteSelectionAsSubAction(eNone, eNoStrip) failed");
return EditActionHandled(rv);
}
}
// XXX Why don't we cancel here? Shouldn't we do this first?
CANCEL_OPERATION_AND_RETURN_EDIT_ACTION_RESULT_IF_READONLY
MaybeDoAutoPasswordMasking();
nsresult rv = EnsureNoPaddingBRElementForEmptyEditor();
if (NS_FAILED(rv)) {
NS_WARNING("EditorBase::EnsureNoPaddingBRElementForEmptyEditor() failed");
return EditActionHandled(rv);
}
// 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 whitespace
// 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);
}
// get the (collapsed) selection location
nsRange* firstRange = SelectionRefPtr()->GetRangeAt(0);
if (NS_WARN_IF(!firstRange)) {
return EditActionHandled(NS_ERROR_FAILURE);
}
EditorRawDOMPoint atStartOfSelection(firstRange->StartRef());
if (NS_WARN_IF(!atStartOfSelection.IsSetAndValid())) {
return EditActionHandled(NS_ERROR_FAILURE);
}
MOZ_ASSERT(!atStartOfSelection.IsContainerHTMLElement(nsGkAtoms::br));
RefPtr<Document> document = GetDocument();
if (NS_WARN_IF(!document)) {
return EditActionHandled(NS_ERROR_NOT_INITIALIZED);
}
if (aEditSubAction == EditSubAction::eInsertTextComingFromIME) {
EditorRawDOMPoint compositionStartPoint = GetCompositionStartPoint();
if (!compositionStartPoint.IsSet()) {
compositionStartPoint = FindBetterInsertionPoint(atStartOfSelection);
NS_WARNING_ASSERTION(
compositionStartPoint.IsSet(),
"EditorBase::FindBetterInsertionPoint() failed, but ignored");
}
nsresult rv = InsertTextWithTransaction(*document, insertionString,
compositionStartPoint);
if (NS_WARN_IF(Destroyed())) {
return EditActionHandled(NS_ERROR_EDITOR_DESTROYED);
}
if (NS_FAILED(rv)) {
NS_WARNING("EditorBase::InsertTextWithTransaction() failed");
return EditActionHandled(rv);
}
} else {
MOZ_ASSERT(aEditSubAction == EditSubAction::eInsertText);
// don't change my selection in subtransactions
AutoTransactionsConserveSelection dontChangeMySelection(*this);
EditorRawDOMPoint pointAfterStringInserted;
nsresult rv = InsertTextWithTransaction(*document, insertionString,
atStartOfSelection,
&pointAfterStringInserted);
if (NS_WARN_IF(Destroyed())) {
return EditActionHandled(NS_ERROR_EDITOR_DESTROYED);
}
if (NS_FAILED(rv)) {
NS_WARNING("EditorBase::InsertTextWithTransaction() failed");
return EditActionHandled(rv);
}
if (pointAfterStringInserted.IsSet()) {
// 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.
bool endsWithLF =
!insertionString.IsEmpty() && insertionString.Last() == nsCRT::LF;
IgnoredErrorResult ignoredError;
SelectionRefPtr()->SetInterlinePosition(endsWithLF, ignoredError);
NS_WARNING_ASSERTION(
!ignoredError.Failed(),
"Selection::SetInterlinePosition() failed, but ignored");
MOZ_ASSERT(
!pointAfterStringInserted.GetChild(),
"After inserting text into a text node, pointAfterStringInserted."
"GetChild() should be nullptr");
ignoredError = IgnoredErrorResult();
SelectionRefPtr()->Collapse(pointAfterStringInserted, ignoredError);
if (NS_WARN_IF(Destroyed())) {
return EditActionHandled(NS_ERROR_EDITOR_DESTROYED);
}
NS_WARNING_ASSERTION(!ignoredError.Failed(),
"Selection::Collapse() failed, but ignored");
}
}
// Unmask inputted character(s) if necessary.
if (IsPasswordEditor() && IsMaskingPassword() && CanEchoPasswordNow()) {
nsresult rv = SetUnmaskRangeAndNotify(start, insertionString.Length(),
LookAndFeel::GetPasswordMaskDelay());
NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
"TextEditor::SetUnmaskRangeAndNotify() failed");
return EditActionHandled(rv);
}
return EditActionHandled();
}
EditActionResult TextEditor::SetTextWithoutTransaction(
const nsAString& aValue) {
MOZ_ASSERT(IsEditActionDataAvailable());
MOZ_ASSERT(!AsHTMLEditor());
MOZ_ASSERT(IsPlaintextEditor());
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();
nsresult rv = EnsureNoPaddingBRElementForEmptyEditor();
if (NS_FAILED(rv)) {
NS_WARNING("EditorBase::EnsureNoPaddingBRElementForEmptyEditor() failed");
return EditActionResult(rv);
}
RefPtr<Element> anonymousDivElement = GetRoot();
nsIContent* firstChild = anonymousDivElement->GetFirstChild();
// 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 single line text editor, i.e., <input>, there is only padding
// <br> element. Otherwise, there should be only one text node. But note
// that even if there is a padding <br> element for empty editor, it's
// already been removed by `EnsureNoPaddingBRElementForEmptyEditor()`. So,
// at here, there should be only one text node or no children.
if (firstChild && (!firstChild->IsText() || firstChild->GetNextSibling())) {
return EditActionIgnored();
}
} else {
// 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 (!firstChild) {
return EditActionIgnored();
}
if (firstChild->IsText()) {
if (!firstChild->GetNextSibling() ||
!EditorUtils::IsPaddingBRElementForEmptyLastLine(
*firstChild->GetNextSibling())) {
return EditActionIgnored();
}
} else if (!EditorUtils::IsPaddingBRElementForEmptyLastLine(*firstChild)) {
return EditActionIgnored();
}
}
// XXX Password fields accept line breaks as normal characters with this code.
// Is this intentional?
nsAutoString sanitizedValue(aValue);
if (IsSingleLineEditor() && !IsPasswordEditor()) {
HandleNewLinesInStringForSingleLineEditor(sanitizedValue);
}
if (!firstChild || !firstChild->IsText()) {
if (sanitizedValue.IsEmpty()) {
return EditActionHandled();
}
RefPtr<Document> document = GetDocument();
if (NS_WARN_IF(!document)) {
return EditActionIgnored();
}
RefPtr<nsTextNode> newTextNode = CreateTextNode(sanitizedValue);
if (!newTextNode) {
NS_WARNING("EditorBase::CreateTextNode() failed");
return EditActionIgnored();
}
nsresult rv = InsertNodeWithTransaction(
*newTextNode, EditorDOMPoint(anonymousDivElement, 0));
if (NS_WARN_IF(Destroyed())) {
return EditActionResult(NS_ERROR_EDITOR_DESTROYED);
}
if (NS_FAILED(rv)) {
NS_WARNING("EditorBase::InsertNodeWithTransaction() failed");
return EditActionResult(rv);
}
return EditActionHandled();
}
// TODO: If new value is empty string, we should only remove it.
RefPtr<Text> textNode = firstChild->GetAsText();
if (MOZ_UNLIKELY(!textNode)) {
NS_WARNING("The first child was not a text node");
return EditActionIgnored();
}
rv = SetTextNodeWithoutTransaction(sanitizedValue, *textNode);
if (NS_FAILED(rv)) {
NS_WARNING("EditorBase::SetTextNodeWithoutTransaction() failed");
return EditActionResult(rv);
}
// If we replaced non-empty value with empty string, we need to delete the
// text node.
if (sanitizedValue.IsEmpty() && !textNode->Length()) {
nsresult rv = DeleteNodeWithTransaction(*textNode);
if (NS_WARN_IF(rv == NS_ERROR_EDITOR_DESTROYED)) {
return EditActionResult(NS_ERROR_EDITOR_DESTROYED);
}
NS_WARNING_ASSERTION(
NS_SUCCEEDED(rv),
"EditorBase::DeleteNodeWithTransaction() failed, but ignored");
// XXX I don't think this is necessary because the anonymous `<div>`
// element has now only padding `<br>` element even if there are
// something.
IgnoredErrorResult ignoredError;
SelectionRefPtr()->SetInterlinePosition(true, ignoredError);
NS_WARNING_ASSERTION(!ignoredError.Failed(),
"Selection::SetInterlinePoisition(true) failed");
}
return EditActionHandled();
}
EditActionResult TextEditor::HandleDeleteSelection(
nsIEditor::EDirection aDirectionAndAmount,
nsIEditor::EStripWrappers aStripWrappers) {
MOZ_ASSERT(IsEditActionDataAvailable());
MOZ_ASSERT(IsTextEditor());
MOZ_ASSERT(aStripWrappers == nsIEditor::eNoStrip);
UndefineCaretBidiLevel();
CANCEL_OPERATION_AND_RETURN_EDIT_ACTION_RESULT_IF_READONLY
// if there is only padding <br> element for empty editor, cancel the
// operation.
if (mPaddingBRElementForEmptyEditor) {
return EditActionCanceled();
}
EditActionResult result =
HandleDeleteSelectionInternal(aDirectionAndAmount, nsIEditor::eNoStrip);
// HandleDeleteSelectionInternal() creates SelectionBatcher. Therefore,
// quitting from it might cause having destroyed the editor.
if (NS_WARN_IF(Destroyed())) {
return result.SetResult(NS_ERROR_EDITOR_DESTROYED);
}
NS_WARNING_ASSERTION(
result.Succeeded(),
"TextEditor::HandleDeleteSelectionInternal(eNoStrip) failed");
return result;
}
EditActionResult TextEditor::HandleDeleteSelectionInternal(
nsIEditor::EDirection aDirectionAndAmount,
nsIEditor::EStripWrappers aStripWrappers) {
MOZ_ASSERT(IsEditActionDataAvailable());
MOZ_ASSERT(IsTextEditor());
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(SelectionRefPtr());
AutoHideSelectionChanges hideSelection(SelectionRefPtr());
nsAutoScriptBlocker scriptBlocker;
if (IsPasswordEditor() && IsMaskingPassword()) {
MaskAllCharacters();
} else {
EditorRawDOMPoint selectionStartPoint(
EditorBase::GetStartPoint(*SelectionRefPtr()));
if (NS_WARN_IF(!selectionStartPoint.IsSet())) {
return EditActionResult(NS_ERROR_FAILURE);
}
if (!SelectionRefPtr()->IsCollapsed()) {
nsresult rv = DeleteSelectionWithTransaction(aDirectionAndAmount,
nsIEditor::eNoStrip);
NS_WARNING_ASSERTION(
NS_SUCCEEDED(rv),
"EditorBase::DeleteSelectionWithTransaction(eNoStrip) failed");
return EditActionHandled(rv);
}
// Test for distance between caret and text that will be deleted
EditActionResult result =
SetCaretBidiLevelForDeletion(selectionStartPoint, aDirectionAndAmount);
if (result.Failed() || result.Canceled()) {
NS_WARNING_ASSERTION(result.Succeeded(),
"EditorBase::SetCaretBidiLevelForDeletion() failed");
return result;
}
}
nsresult rv = ExtendSelectionForDelete(&aDirectionAndAmount);
if (NS_FAILED(rv)) {
NS_WARNING("TextEditor::ExtendSelectionForDelete() failed");
return EditActionResult(rv);
}
rv = DeleteSelectionWithTransaction(aDirectionAndAmount, nsIEditor::eNoStrip);
NS_WARNING_ASSERTION(
NS_SUCCEEDED(rv),
"EditorBase::DeleteSelectionWithTransaction(eNoStrip) failed");
return EditActionHandled(rv);
}
EditActionResult TextEditor::ComputeValueFromTextNodeAndPaddingBRElement(
nsAString& aValue) const {
MOZ_ASSERT(IsEditActionDataAvailable());
// If there is a padding <br> element, there's no content. So output empty
// string.
if (mPaddingBRElementForEmptyEditor) {
aValue.Truncate();
return EditActionHandled();
}
// If it's neither <input type="text"> nor <textarea>, e.g., an HTML editor
// which is in plaintext mode (e.g., plaintext email composer on Thunderbird),
// it should be handled by the expensive path.
if (AsHTMLEditor()) {
return EditActionIgnored();
}
Element* anonymousDivElement = GetRoot();
if (!anonymousDivElement) {
// Don't warn this case, this is possible, e.g., 997805.html
aValue.Truncate();
return EditActionHandled();
}
nsIContent* textNodeOrPaddingBRElement = anonymousDivElement->GetFirstChild();
if (!textNodeOrPaddingBRElement) {
aValue.Truncate();
return EditActionHandled();
}
// If it's an <input type="text"> element, the DOM tree should be:
// <div (::-moz-text-control-editing-root)>
// #text
// </div>
//
// If it's a <textarea> element, the DOM tree should be:
// <div (::-moz-text-control-editing-root)>
// #text (if there is)
// <br type="_moz">
// <scrollbar orient="horizontal">
// ...
// </div>
Text* textNode = textNodeOrPaddingBRElement->GetAsText();
if (!textNode) {
// If there is no text node in the expected DOM tree, we can say that it's
// just empty.
aValue.Truncate();
return EditActionHandled();
}
nsIContent* firstChildExceptText =
textNode ? textNodeOrPaddingBRElement->GetNextSibling()
: textNodeOrPaddingBRElement;
// 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 EditActionIgnored();
}
// Otherwise, the text data is the value.
textNode->GetData(aValue);
return EditActionHandled();
}
nsresult TextEditor::EnsurePaddingBRElementInMultilineEditor() {
MOZ_ASSERT(IsEditActionDataAvailable());
MOZ_ASSERT(IsPlaintextEditor());
MOZ_ASSERT(!IsSingleLineEditor());
Element* anonymousDivElement = GetRoot();
if (NS_WARN_IF(!anonymousDivElement)) {
return NS_ERROR_FAILURE;
}
// Assuming EditorBase::MaybeCreatePaddingBRElementForEmptyEditor() has been
// called first.
// XXX This assumption is wrong. This method may be called alone. Actually,
// we see this warning in mochitest log. So, we should fix this bug
// later.
if (NS_WARN_IF(!anonymousDivElement->GetLastChild())) {
return NS_ERROR_FAILURE;
}
RefPtr<HTMLBRElement> brElement =
HTMLBRElement::FromNode(anonymousDivElement->GetLastChild());
if (!brElement) {
AutoTransactionsConserveSelection dontChangeMySelection(*this);
EditorDOMPoint endOfAnonymousDiv(
EditorDOMPoint::AtEndOf(*anonymousDivElement));
CreateElementResult createPaddingBRResult =
InsertPaddingBRElementForEmptyLastLineWithTransaction(
endOfAnonymousDiv);
NS_WARNING_ASSERTION(
createPaddingBRResult.Succeeded(),
"EditorBase::InsertPaddingBRElementForEmptyLastLineWithTransaction() "
"failed");
return createPaddingBRResult.Rv();
}
// Check to see if the trailing BR is a former padding <br> element for empty
// editor - this will have stuck around if we previously morphed a trailing
// node into a padding <br> element.
if (!brElement->IsPaddingForEmptyEditor()) {
return NS_OK;
}
// Morph it back to a padding <br> element for empty last line.
brElement->UnsetFlags(NS_PADDING_FOR_EMPTY_EDITOR);
brElement->SetFlags(NS_PADDING_FOR_EMPTY_LAST_LINE);
return NS_OK;
}
EditActionResult TextEditor::MaybeTruncateInsertionStringForMaxLength(
nsAString& aInsertionString) {
MOZ_ASSERT(IsEditActionDataAvailable());
MOZ_ASSERT(mMaxTextLength >= 0);
if (!IsPlaintextEditor() || IsIMEComposing()) {
return EditActionIgnored();
}
// 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 EditActionIgnored();
}
}
[[fallthrough]];
default:
break;
}
int32_t currentLength = INT32_MAX;
nsresult rv = GetTextLength(&currentLength);
if (NS_FAILED(rv)) {
NS_WARNING("TextEditor::GetTextLength() failed");
return EditActionResult(rv);
}
uint32_t selectionStart, selectionEnd;
nsContentUtils::GetSelectionInTextControl(SelectionRefPtr(), 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 >= static_cast<uint32_t>(mMaxTextLength)) {
aInsertionString.Truncate(); // Too long, we cannot accept new character.
return EditActionHandled();
}
if (aInsertionString.Length() + kNewLength <=
static_cast<uint32_t>(mMaxTextLength)) {
return EditActionIgnored(); // 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 EditActionHandled();
}
bool TextEditor::CanEchoPasswordNow() const {
if (!LookAndFeel::GetEchoPassword() ||
(mFlags & nsIEditor::eEditorDontEchoPassword)) {
return false;
}
return GetEditAction() != EditAction::eDrop &&
GetEditAction() != EditAction::ePaste;
}
} // namespace mozilla
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