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gecko-dev/editor/libeditor/nsTextEditRules.cpp

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42 KiB
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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 "nsTextEditRules.h"
#include "mozilla/Assertions.h"
#include "mozilla/LookAndFeel.h"
#include "mozilla/Preferences.h"
#include "mozilla/dom/Selection.h"
#include "mozilla/TextComposition.h"
#include "mozilla/dom/Element.h"
#include "nsAString.h"
#include "nsAutoPtr.h"
#include "nsCOMPtr.h"
#include "nsCRT.h"
#include "nsCRTGlue.h"
#include "nsComponentManagerUtils.h"
#include "nsContentUtils.h"
#include "nsDebug.h"
#include "nsEditor.h"
#include "nsEditorUtils.h"
#include "nsError.h"
#include "nsGkAtoms.h"
#include "nsIContent.h"
#include "nsIDOMCharacterData.h"
#include "nsIDOMDocument.h"
#include "nsIDOMElement.h"
#include "nsIDOMNode.h"
#include "nsIDOMNodeFilter.h"
#include "nsIDOMNodeIterator.h"
#include "nsIDOMNodeList.h"
#include "nsIDOMText.h"
#include "nsNameSpaceManager.h"
#include "nsINode.h"
#include "nsIPlaintextEditor.h"
#include "nsISupportsBase.h"
#include "nsLiteralString.h"
#include "mozilla/dom/NodeIterator.h"
#include "nsTextEditUtils.h"
#include "nsUnicharUtils.h"
using namespace mozilla;
using namespace mozilla::dom;
#define CANCEL_OPERATION_IF_READONLY_OR_DISABLED \
if (IsReadonly() || IsDisabled()) \
{ \
*aCancel = true; \
return NS_OK; \
};
/********************************************************
* Constructor/Destructor
********************************************************/
nsTextEditRules::nsTextEditRules()
{
InitFields();
}
void
nsTextEditRules::InitFields()
{
mEditor = nullptr;
mPasswordText.Truncate();
mPasswordIMEText.Truncate();
mPasswordIMEIndex = 0;
mBogusNode = nullptr;
mCachedSelectionNode = nullptr;
mCachedSelectionOffset = 0;
mActionNesting = 0;
mLockRulesSniffing = false;
mDidExplicitlySetInterline = false;
mDeleteBidiImmediately = false;
mTheAction = EditAction::none;
mTimer = nullptr;
mLastStart = 0;
mLastLength = 0;
}
nsTextEditRules::~nsTextEditRules()
{
// do NOT delete mEditor here. We do not hold a ref count to mEditor. mEditor owns our lifespan.
if (mTimer)
mTimer->Cancel();
}
/********************************************************
* XPCOM Cruft
********************************************************/
NS_IMPL_CYCLE_COLLECTION(nsTextEditRules, mBogusNode, mCachedSelectionNode)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsTextEditRules)
NS_INTERFACE_MAP_ENTRY(nsIEditRules)
NS_INTERFACE_MAP_ENTRY(nsITimerCallback)
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIEditRules)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(nsTextEditRules)
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsTextEditRules)
/********************************************************
* Public methods
********************************************************/
NS_IMETHODIMP
nsTextEditRules::Init(nsPlaintextEditor *aEditor)
{
if (!aEditor) { return NS_ERROR_NULL_POINTER; }
InitFields();
mEditor = aEditor; // we hold a non-refcounted reference back to our editor
nsRefPtr<Selection> selection = mEditor->GetSelection();
NS_WARN_IF_FALSE(selection, "editor cannot get selection");
// Put in a magic br if needed. This method handles null selection,
// which should never happen anyway
nsresult res = CreateBogusNodeIfNeeded(selection);
NS_ENSURE_SUCCESS(res, res);
// If the selection hasn't been set up yet, set it up collapsed to the end of
// our editable content.
int32_t rangeCount;
res = selection->GetRangeCount(&rangeCount);
NS_ENSURE_SUCCESS(res, res);
if (!rangeCount) {
res = mEditor->EndOfDocument();
NS_ENSURE_SUCCESS(res, res);
}
if (IsPlaintextEditor())
{
// ensure trailing br node
res = CreateTrailingBRIfNeeded();
NS_ENSURE_SUCCESS(res, res);
}
mDeleteBidiImmediately =
Preferences::GetBool("bidi.edit.delete_immediately", false);
return res;
}
NS_IMETHODIMP
nsTextEditRules::SetInitialValue(const nsAString& aValue)
{
if (IsPasswordEditor()) {
mPasswordText = aValue;
}
return NS_OK;
}
NS_IMETHODIMP
nsTextEditRules::DetachEditor()
{
if (mTimer)
mTimer->Cancel();
mEditor = nullptr;
return NS_OK;
}
NS_IMETHODIMP
nsTextEditRules::BeforeEdit(EditAction action,
nsIEditor::EDirection aDirection)
{
if (mLockRulesSniffing) return NS_OK;
nsAutoLockRulesSniffing lockIt(this);
mDidExplicitlySetInterline = false;
if (!mActionNesting)
{
// let rules remember the top level action
mTheAction = action;
}
mActionNesting++;
// get the selection and cache the position before editing
NS_ENSURE_STATE(mEditor);
nsRefPtr<Selection> selection = mEditor->GetSelection();
NS_ENSURE_STATE(selection);
selection->GetAnchorNode(getter_AddRefs(mCachedSelectionNode));
selection->GetAnchorOffset(&mCachedSelectionOffset);
return NS_OK;
}
NS_IMETHODIMP
nsTextEditRules::AfterEdit(EditAction action,
nsIEditor::EDirection aDirection)
{
if (mLockRulesSniffing) return NS_OK;
nsAutoLockRulesSniffing lockIt(this);
NS_PRECONDITION(mActionNesting>0, "bad action nesting!");
nsresult res = NS_OK;
if (!--mActionNesting)
{
NS_ENSURE_STATE(mEditor);
nsRefPtr<Selection> selection = mEditor->GetSelection();
NS_ENSURE_STATE(selection);
NS_ENSURE_STATE(mEditor);
res = mEditor->HandleInlineSpellCheck(action, selection,
mCachedSelectionNode, mCachedSelectionOffset,
nullptr, 0, nullptr, 0);
NS_ENSURE_SUCCESS(res, res);
// if only trailing <br> remaining remove it
res = RemoveRedundantTrailingBR();
if (NS_FAILED(res))
return res;
// detect empty doc
res = CreateBogusNodeIfNeeded(selection);
NS_ENSURE_SUCCESS(res, res);
// ensure trailing br node
res = CreateTrailingBRIfNeeded();
NS_ENSURE_SUCCESS(res, res);
// collapse the selection to the trailing BR if it's at the end of our text node
CollapseSelectionToTrailingBRIfNeeded(selection);
}
return res;
}
NS_IMETHODIMP
nsTextEditRules::WillDoAction(Selection* aSelection,
nsRulesInfo* aInfo,
bool* aCancel,
bool* aHandled)
{
// null selection is legal
MOZ_ASSERT(aInfo && aCancel && aHandled);
*aCancel = false;
*aHandled = false;
// my kingdom for dynamic cast
nsTextRulesInfo *info = static_cast<nsTextRulesInfo*>(aInfo);
switch (info->action) {
case EditAction::insertBreak:
UndefineCaretBidiLevel(aSelection);
return WillInsertBreak(aSelection, aCancel, aHandled, info->maxLength);
case EditAction::insertText:
case EditAction::insertIMEText:
UndefineCaretBidiLevel(aSelection);
return WillInsertText(info->action, aSelection, aCancel, aHandled,
info->inString, info->outString, info->maxLength);
case EditAction::deleteSelection:
return WillDeleteSelection(aSelection, info->collapsedAction,
aCancel, aHandled);
case EditAction::undo:
return WillUndo(aSelection, aCancel, aHandled);
case EditAction::redo:
return WillRedo(aSelection, aCancel, aHandled);
case EditAction::setTextProperty:
return WillSetTextProperty(aSelection, aCancel, aHandled);
case EditAction::removeTextProperty:
return WillRemoveTextProperty(aSelection, aCancel, aHandled);
case EditAction::outputText:
return WillOutputText(aSelection, info->outputFormat, info->outString,
aCancel, aHandled);
case EditAction::insertElement:
// i had thought this would be html rules only. but we put pre elements
// into plaintext mail when doing quoting for reply! doh!
return WillInsert(aSelection, aCancel);
default:
return NS_ERROR_FAILURE;
}
}
NS_IMETHODIMP
nsTextEditRules::DidDoAction(Selection* aSelection,
nsRulesInfo *aInfo, nsresult aResult)
{
NS_ENSURE_STATE(mEditor);
// don't let any txns in here move the selection around behind our back.
// Note that this won't prevent explicit selection setting from working.
nsAutoTxnsConserveSelection dontSpazMySelection(mEditor);
NS_ENSURE_TRUE(aSelection && aInfo, NS_ERROR_NULL_POINTER);
// my kingdom for dynamic cast
nsTextRulesInfo *info = static_cast<nsTextRulesInfo*>(aInfo);
switch (info->action)
{
case EditAction::insertBreak:
return DidInsertBreak(aSelection, aResult);
case EditAction::insertText:
case EditAction::insertIMEText:
return DidInsertText(aSelection, aResult);
case EditAction::deleteSelection:
return DidDeleteSelection(aSelection, info->collapsedAction, aResult);
case EditAction::undo:
return DidUndo(aSelection, aResult);
case EditAction::redo:
return DidRedo(aSelection, aResult);
case EditAction::setTextProperty:
return DidSetTextProperty(aSelection, aResult);
case EditAction::removeTextProperty:
return DidRemoveTextProperty(aSelection, aResult);
case EditAction::outputText:
return DidOutputText(aSelection, aResult);
default:
// Don't fail on transactions we don't handle here!
return NS_OK;
}
}
NS_IMETHODIMP
nsTextEditRules::DocumentIsEmpty(bool *aDocumentIsEmpty)
{
NS_ENSURE_TRUE(aDocumentIsEmpty, NS_ERROR_NULL_POINTER);
*aDocumentIsEmpty = (mBogusNode != nullptr);
return NS_OK;
}
/********************************************************
* Protected methods
********************************************************/
nsresult
nsTextEditRules::WillInsert(Selection* aSelection, bool* aCancel)
{
NS_ENSURE_TRUE(aSelection && aCancel, NS_ERROR_NULL_POINTER);
CANCEL_OPERATION_IF_READONLY_OR_DISABLED
// initialize out param
*aCancel = false;
// check for the magic content node and delete it if it exists
if (mBogusNode)
{
NS_ENSURE_STATE(mEditor);
mEditor->DeleteNode(mBogusNode);
mBogusNode = nullptr;
}
return NS_OK;
}
nsresult
nsTextEditRules::DidInsert(Selection* aSelection, nsresult aResult)
{
return NS_OK;
}
nsresult
nsTextEditRules::WillInsertBreak(Selection* aSelection,
bool *aCancel,
bool *aHandled,
int32_t aMaxLength)
{
if (!aSelection || !aCancel || !aHandled) { return NS_ERROR_NULL_POINTER; }
CANCEL_OPERATION_IF_READONLY_OR_DISABLED
*aHandled = false;
if (IsSingleLineEditor()) {
*aCancel = true;
}
else
{
// handle docs with a max length
// NOTE, this function copies inString into outString for us.
NS_NAMED_LITERAL_STRING(inString, "\n");
nsAutoString outString;
bool didTruncate;
nsresult res = TruncateInsertionIfNeeded(aSelection, &inString, &outString,
aMaxLength, &didTruncate);
NS_ENSURE_SUCCESS(res, res);
if (didTruncate) {
*aCancel = true;
return NS_OK;
}
*aCancel = false;
// if the selection isn't collapsed, delete it.
bool bCollapsed;
res = aSelection->GetIsCollapsed(&bCollapsed);
NS_ENSURE_SUCCESS(res, res);
if (!bCollapsed)
{
NS_ENSURE_STATE(mEditor);
res = mEditor->DeleteSelection(nsIEditor::eNone, nsIEditor::eStrip);
NS_ENSURE_SUCCESS(res, res);
}
res = WillInsert(aSelection, aCancel);
NS_ENSURE_SUCCESS(res, res);
// initialize out param
// we want to ignore result of WillInsert()
*aCancel = false;
}
return NS_OK;
}
nsresult
nsTextEditRules::DidInsertBreak(Selection* aSelection, nsresult aResult)
{
return NS_OK;
}
nsresult
nsTextEditRules::CollapseSelectionToTrailingBRIfNeeded(Selection* aSelection)
{
// we only need to execute the stuff below if we are a plaintext editor.
// html editors have a different mechanism for putting in mozBR's
// (because there are a bunch more places you have to worry about it in html)
if (!IsPlaintextEditor()) {
return NS_OK;
}
NS_ENSURE_STATE(mEditor);
// If there is no selection ranges, we should set to the end of the editor.
// This is usually performed in nsTextEditRules::Init(), however, if the
// editor is reframed, this may be called by AfterEdit().
if (!aSelection->RangeCount()) {
mEditor->EndOfDocument();
}
// if we are at the end of the textarea, we need to set the
// selection to stick to the mozBR at the end of the textarea.
int32_t selOffset;
nsCOMPtr<nsIDOMNode> selNode;
nsresult res;
res = mEditor->GetStartNodeAndOffset(aSelection, getter_AddRefs(selNode), &selOffset);
NS_ENSURE_SUCCESS(res, res);
nsCOMPtr<nsIDOMText> nodeAsText = do_QueryInterface(selNode);
if (!nodeAsText) return NS_OK; // nothing to do if we're not at a text node
uint32_t length;
res = nodeAsText->GetLength(&length);
NS_ENSURE_SUCCESS(res, res);
// nothing to do if we're not at the end of the text node
if (selOffset != int32_t(length))
return NS_OK;
int32_t parentOffset;
nsCOMPtr<nsIDOMNode> parentNode = nsEditor::GetNodeLocation(selNode, &parentOffset);
NS_ENSURE_STATE(mEditor);
nsCOMPtr<nsIDOMNode> root = do_QueryInterface(mEditor->GetRoot());
NS_ENSURE_TRUE(root, NS_ERROR_NULL_POINTER);
if (parentNode != root) return NS_OK;
nsCOMPtr<nsIDOMNode> nextNode = mEditor->GetChildAt(parentNode,
parentOffset + 1);
if (nextNode && nsTextEditUtils::IsMozBR(nextNode))
{
res = aSelection->Collapse(parentNode, parentOffset + 1);
NS_ENSURE_SUCCESS(res, res);
}
return res;
}
static inline already_AddRefed<nsIDOMNode>
GetTextNode(Selection* selection, nsEditor* editor) {
int32_t selOffset;
nsCOMPtr<nsIDOMNode> selNode;
nsresult res = editor->GetStartNodeAndOffset(selection, getter_AddRefs(selNode), &selOffset);
NS_ENSURE_SUCCESS(res, nullptr);
if (!editor->IsTextNode(selNode)) {
// Get an nsINode from the nsIDOMNode
nsCOMPtr<nsINode> node = do_QueryInterface(selNode);
// if node is null, return it to indicate there's no text
NS_ENSURE_TRUE(node, nullptr);
// This should be the root node, walk the tree looking for text nodes
NodeFilterHolder filter;
nsRefPtr<NodeIterator> iter = new NodeIterator(node, nsIDOMNodeFilter::SHOW_TEXT, filter);
while (!editor->IsTextNode(selNode)) {
if (NS_FAILED(res = iter->NextNode(getter_AddRefs(selNode))) || !selNode) {
return nullptr;
}
}
}
return selNode.forget();
}
#ifdef DEBUG
#define ASSERT_PASSWORD_LENGTHS_EQUAL() \
if (IsPasswordEditor() && mEditor->GetRoot()) { \
int32_t txtLen; \
mEditor->GetTextLength(&txtLen); \
NS_ASSERTION(mPasswordText.Length() == uint32_t(txtLen), \
"password length not equal to number of asterisks"); \
}
#else
#define ASSERT_PASSWORD_LENGTHS_EQUAL()
#endif
// static
void
nsTextEditRules::HandleNewLines(nsString &aString,
int32_t aNewlineHandling)
{
if (aNewlineHandling < 0) {
int32_t caretStyle;
nsPlaintextEditor::GetDefaultEditorPrefs(aNewlineHandling, caretStyle);
}
switch(aNewlineHandling)
{
case nsIPlaintextEditor::eNewlinesReplaceWithSpaces:
// Strip trailing newlines first so we don't wind up with trailing spaces
aString.Trim(CRLF, false, true);
aString.ReplaceChar(CRLF, ' ');
break;
case nsIPlaintextEditor::eNewlinesStrip:
aString.StripChars(CRLF);
break;
case nsIPlaintextEditor::eNewlinesPasteToFirst:
default:
{
int32_t firstCRLF = aString.FindCharInSet(CRLF);
// we get first *non-empty* line.
int32_t offset = 0;
while (firstCRLF == offset)
{
offset++;
firstCRLF = aString.FindCharInSet(CRLF, offset);
}
if (firstCRLF > 0)
aString.Truncate(firstCRLF);
if (offset > 0)
aString.Cut(0, offset);
}
break;
case nsIPlaintextEditor::eNewlinesReplaceWithCommas:
aString.Trim(CRLF, true, true);
aString.ReplaceChar(CRLF, ',');
break;
case nsIPlaintextEditor::eNewlinesStripSurroundingWhitespace:
{
nsString result;
uint32_t offset = 0;
while (offset < aString.Length())
{
int32_t nextCRLF = aString.FindCharInSet(CRLF, offset);
if (nextCRLF < 0) {
result.Append(nsDependentSubstring(aString, offset));
break;
}
uint32_t wsBegin = nextCRLF;
// 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 = nextCRLF + 1;
while (offset < aString.Length() && NS_IS_SPACE(aString[offset]))
++offset;
}
aString = result;
}
break;
case nsIPlaintextEditor::eNewlinesPasteIntact:
// even if we're pasting newlines, don't paste leading/trailing ones
aString.Trim(CRLF, true, true);
break;
}
}
nsresult
nsTextEditRules::WillInsertText(EditAction aAction,
Selection* aSelection,
bool *aCancel,
bool *aHandled,
const nsAString *inString,
nsAString *outString,
int32_t aMaxLength)
{
if (!aSelection || !aCancel || !aHandled) { return NS_ERROR_NULL_POINTER; }
if (inString->IsEmpty() && aAction != EditAction::insertIMEText) {
// 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.
*aCancel = true;
*aHandled = false;
return NS_OK;
}
// initialize out param
*aCancel = false;
*aHandled = true;
// handle docs with a max length
// NOTE, this function copies inString into outString for us.
bool truncated = false;
nsresult res = TruncateInsertionIfNeeded(aSelection, inString, outString,
aMaxLength, &truncated);
NS_ENSURE_SUCCESS(res, res);
// If we're exceeding the maxlength when composing IME, we need to clean up
// the composing text, so we shouldn't return early.
if (truncated && outString->IsEmpty() &&
aAction != EditAction::insertIMEText) {
*aCancel = true;
return NS_OK;
}
int32_t start = 0;
int32_t end = 0;
// handle password field docs
if (IsPasswordEditor()) {
NS_ENSURE_STATE(mEditor);
nsContentUtils::GetSelectionInTextControl(aSelection, mEditor->GetRoot(),
start, end);
}
// if the selection isn't collapsed, delete it.
bool bCollapsed;
res = aSelection->GetIsCollapsed(&bCollapsed);
NS_ENSURE_SUCCESS(res, res);
if (!bCollapsed)
{
NS_ENSURE_STATE(mEditor);
res = mEditor->DeleteSelection(nsIEditor::eNone, nsIEditor::eStrip);
NS_ENSURE_SUCCESS(res, res);
}
res = WillInsert(aSelection, aCancel);
NS_ENSURE_SUCCESS(res, res);
// initialize out param
// we want to ignore result of WillInsert()
*aCancel = false;
// handle password field data
// this has the side effect of changing all the characters in aOutString
// to the replacement character
if (IsPasswordEditor())
{
if (aAction == EditAction::insertIMEText) {
RemoveIMETextFromPWBuf(start, outString);
}
}
// 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())
{
nsAutoString tString(*outString);
NS_ENSURE_STATE(mEditor);
HandleNewLines(tString, mEditor->mNewlineHandling);
outString->Assign(tString);
}
if (IsPasswordEditor())
{
// manage the password buffer
mPasswordText.Insert(*outString, start);
if (LookAndFeel::GetEchoPassword() && !DontEchoPassword()) {
HideLastPWInput();
mLastStart = start;
mLastLength = outString->Length();
if (mTimer)
{
mTimer->Cancel();
}
else
{
mTimer = do_CreateInstance("@mozilla.org/timer;1", &res);
NS_ENSURE_SUCCESS(res, res);
}
mTimer->InitWithCallback(this, LookAndFeel::GetPasswordMaskDelay(),
nsITimer::TYPE_ONE_SHOT);
}
else
{
FillBufWithPWChars(outString, outString->Length());
}
}
// get the (collapsed) selection location
NS_ENSURE_STATE(aSelection->GetRangeAt(0));
nsCOMPtr<nsINode> selNode = aSelection->GetRangeAt(0)->GetStartParent();
int32_t selOffset = aSelection->GetRangeAt(0)->StartOffset();
NS_ENSURE_STATE(selNode);
// don't put text in places that can't have it
NS_ENSURE_STATE(mEditor);
if (!mEditor->IsTextNode(selNode) &&
!mEditor->CanContainTag(*selNode, *nsGkAtoms::textTagName)) {
return NS_ERROR_FAILURE;
}
// we need to get the doc
NS_ENSURE_STATE(mEditor);
nsCOMPtr<nsIDocument> doc = mEditor->GetDocument();
NS_ENSURE_TRUE(doc, NS_ERROR_NOT_INITIALIZED);
if (aAction == EditAction::insertIMEText) {
NS_ENSURE_STATE(mEditor);
// Find better insertion point to insert text.
mEditor->FindBetterInsertionPoint(selNode, selOffset);
// If there is one or more IME selections, its minimum offset should be
// the insertion point.
int32_t IMESelectionOffset = mEditor->GetIMESelectionStartOffsetIn(selNode);
if (IMESelectionOffset >= 0) {
selOffset = IMESelectionOffset;
}
res = mEditor->InsertTextImpl(*outString, address_of(selNode), &selOffset, doc);
NS_ENSURE_SUCCESS(res, res);
} else {
// aAction == EditAction::insertText; find where we are
nsCOMPtr<nsINode> curNode = selNode;
int32_t curOffset = selOffset;
// don't spaz my selection in subtransactions
NS_ENSURE_STATE(mEditor);
nsAutoTxnsConserveSelection dontSpazMySelection(mEditor);
res = mEditor->InsertTextImpl(*outString, address_of(curNode),
&curOffset, doc);
NS_ENSURE_SUCCESS(res, res);
if (curNode)
{
// 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 =
!outString->IsEmpty() && outString->Last() == nsCRT::LF;
aSelection->SetInterlinePosition(endsWithLF);
aSelection->Collapse(curNode, curOffset);
}
}
ASSERT_PASSWORD_LENGTHS_EQUAL()
return res;
}
nsresult
nsTextEditRules::DidInsertText(Selection* aSelection, nsresult aResult)
{
return DidInsert(aSelection, aResult);
}
nsresult
nsTextEditRules::WillSetTextProperty(Selection* aSelection, bool* aCancel,
bool* aHandled)
{
if (!aSelection || !aCancel || !aHandled)
{ return NS_ERROR_NULL_POINTER; }
// XXX: should probably return a success value other than NS_OK that means "not allowed"
if (IsPlaintextEditor()) {
*aCancel = true;
}
return NS_OK;
}
nsresult
nsTextEditRules::DidSetTextProperty(Selection* aSelection, nsresult aResult)
{
return NS_OK;
}
nsresult
nsTextEditRules::WillRemoveTextProperty(Selection* aSelection, bool* aCancel,
bool* aHandled)
{
if (!aSelection || !aCancel || !aHandled)
{ return NS_ERROR_NULL_POINTER; }
// XXX: should probably return a success value other than NS_OK that means "not allowed"
if (IsPlaintextEditor()) {
*aCancel = true;
}
return NS_OK;
}
nsresult
nsTextEditRules::DidRemoveTextProperty(Selection* aSelection, nsresult aResult)
{
return NS_OK;
}
nsresult
nsTextEditRules::WillDeleteSelection(Selection* aSelection,
nsIEditor::EDirection aCollapsedAction,
bool *aCancel,
bool *aHandled)
{
if (!aSelection || !aCancel || !aHandled) { return NS_ERROR_NULL_POINTER; }
CANCEL_OPERATION_IF_READONLY_OR_DISABLED
// initialize out param
*aCancel = false;
*aHandled = false;
// if there is only bogus content, cancel the operation
if (mBogusNode) {
*aCancel = true;
return NS_OK;
}
nsresult res = NS_OK;
// 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(aSelection);
AutoHideSelectionChanges hideSelection(aSelection);
nsAutoScriptBlocker scriptBlocker;
if (IsPasswordEditor())
{
NS_ENSURE_STATE(mEditor);
res = mEditor->ExtendSelectionForDelete(aSelection, &aCollapsedAction);
NS_ENSURE_SUCCESS(res, res);
// manage the password buffer
int32_t start, end;
nsContentUtils::GetSelectionInTextControl(aSelection, mEditor->GetRoot(),
start, end);
if (LookAndFeel::GetEchoPassword()) {
HideLastPWInput();
mLastStart = start;
mLastLength = 0;
if (mTimer)
{
mTimer->Cancel();
}
}
if (end == start)
{ // collapsed selection
if (nsIEditor::ePrevious==aCollapsedAction && 0<start) { // del back
mPasswordText.Cut(start-1, 1);
}
else if (nsIEditor::eNext==aCollapsedAction) { // del forward
mPasswordText.Cut(start, 1);
}
// otherwise nothing to do for this collapsed selection
}
else { // extended selection
mPasswordText.Cut(start, end-start);
}
}
else
{
nsCOMPtr<nsIDOMNode> startNode;
int32_t startOffset;
NS_ENSURE_STATE(mEditor);
res = mEditor->GetStartNodeAndOffset(aSelection, getter_AddRefs(startNode), &startOffset);
NS_ENSURE_SUCCESS(res, res);
NS_ENSURE_TRUE(startNode, NS_ERROR_FAILURE);
bool bCollapsed;
res = aSelection->GetIsCollapsed(&bCollapsed);
NS_ENSURE_SUCCESS(res, res);
if (!bCollapsed)
return NS_OK;
// Test for distance between caret and text that will be deleted
res = CheckBidiLevelForDeletion(aSelection, startNode, startOffset, aCollapsedAction, aCancel);
NS_ENSURE_SUCCESS(res, res);
if (*aCancel) return NS_OK;
NS_ENSURE_STATE(mEditor);
res = mEditor->ExtendSelectionForDelete(aSelection, &aCollapsedAction);
NS_ENSURE_SUCCESS(res, res);
}
NS_ENSURE_STATE(mEditor);
res = mEditor->DeleteSelectionImpl(aCollapsedAction, nsIEditor::eStrip);
NS_ENSURE_SUCCESS(res, res);
*aHandled = true;
ASSERT_PASSWORD_LENGTHS_EQUAL()
return NS_OK;
}
nsresult
nsTextEditRules::DidDeleteSelection(Selection* aSelection,
nsIEditor::EDirection aCollapsedAction,
nsresult aResult)
{
nsCOMPtr<nsIDOMNode> startNode;
int32_t startOffset;
NS_ENSURE_STATE(mEditor);
nsresult res = mEditor->GetStartNodeAndOffset(aSelection, getter_AddRefs(startNode), &startOffset);
NS_ENSURE_SUCCESS(res, res);
NS_ENSURE_TRUE(startNode, NS_ERROR_FAILURE);
// delete empty text nodes at selection
if (mEditor->IsTextNode(startNode))
{
nsCOMPtr<nsIDOMText> textNode = do_QueryInterface(startNode);
uint32_t strLength;
res = textNode->GetLength(&strLength);
NS_ENSURE_SUCCESS(res, res);
// are we in an empty text node?
if (!strLength)
{
res = mEditor->DeleteNode(startNode);
NS_ENSURE_SUCCESS(res, res);
}
}
if (!mDidExplicitlySetInterline)
{
// We prevent the caret from sticking on the left of prior BR
// (i.e. the end of previous line) after this deletion. Bug 92124
res = aSelection->SetInterlinePosition(true);
}
return res;
}
nsresult
nsTextEditRules::WillUndo(Selection* aSelection, bool* aCancel, bool* aHandled)
{
if (!aSelection || !aCancel || !aHandled) { return NS_ERROR_NULL_POINTER; }
CANCEL_OPERATION_IF_READONLY_OR_DISABLED
// initialize out param
*aCancel = false;
*aHandled = false;
return NS_OK;
}
/* the idea here is to see if the magic empty node has suddenly reappeared as the result of the undo.
* if it has, set our state so we remember it.
* There is a tradeoff between doing here and at redo, or doing it everywhere else that might care.
* Since undo and redo are relatively rare, it makes sense to take the (small) performance hit here.
*/
nsresult
nsTextEditRules::DidUndo(Selection* aSelection, nsresult aResult)
{
NS_ENSURE_TRUE(aSelection, NS_ERROR_NULL_POINTER);
// If aResult is an error, we return it.
NS_ENSURE_SUCCESS(aResult, aResult);
NS_ENSURE_STATE(mEditor);
dom::Element* theRoot = mEditor->GetRoot();
NS_ENSURE_TRUE(theRoot, NS_ERROR_FAILURE);
nsIContent* node = mEditor->GetLeftmostChild(theRoot);
if (node && mEditor->IsMozEditorBogusNode(node)) {
mBogusNode = do_QueryInterface(node);
} else {
mBogusNode = nullptr;
}
return aResult;
}
nsresult
nsTextEditRules::WillRedo(Selection* aSelection, bool* aCancel, bool* aHandled)
{
if (!aSelection || !aCancel || !aHandled) { return NS_ERROR_NULL_POINTER; }
CANCEL_OPERATION_IF_READONLY_OR_DISABLED
// initialize out param
*aCancel = false;
*aHandled = false;
return NS_OK;
}
nsresult
nsTextEditRules::DidRedo(Selection* aSelection, nsresult aResult)
{
nsresult res = aResult; // if aResult is an error, we return it.
if (!aSelection) { return NS_ERROR_NULL_POINTER; }
if (NS_SUCCEEDED(res))
{
NS_ENSURE_STATE(mEditor);
nsCOMPtr<nsIDOMElement> theRoot = do_QueryInterface(mEditor->GetRoot());
NS_ENSURE_TRUE(theRoot, NS_ERROR_FAILURE);
nsCOMPtr<nsIDOMHTMLCollection> nodeList;
res = theRoot->GetElementsByTagName(NS_LITERAL_STRING("br"),
getter_AddRefs(nodeList));
NS_ENSURE_SUCCESS(res, res);
if (nodeList)
{
uint32_t len;
nodeList->GetLength(&len);
if (len != 1) {
// only in the case of one br could there be the bogus node
mBogusNode = nullptr;
return NS_OK;
}
nsCOMPtr<nsIDOMNode> node;
nodeList->Item(0, getter_AddRefs(node));
nsCOMPtr<nsIContent> content = do_QueryInterface(node);
MOZ_ASSERT(content);
if (mEditor->IsMozEditorBogusNode(content)) {
mBogusNode = node;
} else {
mBogusNode = nullptr;
}
}
}
return res;
}
nsresult
nsTextEditRules::WillOutputText(Selection* aSelection,
const nsAString *aOutputFormat,
nsAString *aOutString,
bool *aCancel,
bool *aHandled)
{
// null selection ok
if (!aOutString || !aOutputFormat || !aCancel || !aHandled)
{ return NS_ERROR_NULL_POINTER; }
// initialize out param
*aCancel = false;
*aHandled = false;
nsAutoString outputFormat(*aOutputFormat);
ToLowerCase(outputFormat);
if (outputFormat.EqualsLiteral("text/plain"))
{ // only use these rules for plain text output
if (IsPasswordEditor())
{
*aOutString = mPasswordText;
*aHandled = true;
}
else if (mBogusNode)
{ // this means there's no content, so output null string
aOutString->Truncate();
*aHandled = true;
}
}
return NS_OK;
}
nsresult
nsTextEditRules::DidOutputText(Selection* aSelection, nsresult aResult)
{
return NS_OK;
}
nsresult
nsTextEditRules::RemoveRedundantTrailingBR()
{
// If the bogus node exists, we have no work to do
if (mBogusNode)
return NS_OK;
// Likewise, nothing to be done if we could never have inserted a trailing br
if (IsSingleLineEditor())
return NS_OK;
NS_ENSURE_STATE(mEditor);
nsRefPtr<dom::Element> body = mEditor->GetRoot();
if (!body)
return NS_ERROR_NULL_POINTER;
uint32_t childCount = body->GetChildCount();
if (childCount > 1) {
// The trailing br is redundant if it is the only remaining child node
return NS_OK;
}
nsRefPtr<nsIContent> child = body->GetFirstChild();
if (!child || !child->IsElement()) {
return NS_OK;
}
dom::Element* elem = child->AsElement();
if (!nsTextEditUtils::IsMozBR(elem)) {
return NS_OK;
}
// Rather than deleting this node from the DOM tree we should instead
// morph this br into the bogus node
elem->UnsetAttr(kNameSpaceID_None, nsGkAtoms::type, true);
// set mBogusNode to be this <br>
mBogusNode = do_QueryInterface(elem);
// give it the bogus node attribute
elem->SetAttr(kNameSpaceID_None, kMOZEditorBogusNodeAttrAtom,
kMOZEditorBogusNodeValue, false);
return NS_OK;
}
nsresult
nsTextEditRules::CreateTrailingBRIfNeeded()
{
// but only if we aren't a single line edit field
if (IsSingleLineEditor()) {
return NS_OK;
}
NS_ENSURE_STATE(mEditor);
dom::Element* body = mEditor->GetRoot();
NS_ENSURE_TRUE(body, NS_ERROR_NULL_POINTER);
nsIContent* lastChild = body->GetLastChild();
// assuming CreateBogusNodeIfNeeded() has been called first
NS_ENSURE_TRUE(lastChild, NS_ERROR_NULL_POINTER);
if (!lastChild->IsHTMLElement(nsGkAtoms::br)) {
nsAutoTxnsConserveSelection dontSpazMySelection(mEditor);
nsCOMPtr<nsIDOMNode> domBody = do_QueryInterface(body);
return CreateMozBR(domBody, body->Length());
}
// Check to see if the trailing BR is a former bogus node - this will have
// stuck around if we previously morphed a trailing node into a bogus node.
if (!mEditor->IsMozEditorBogusNode(lastChild)) {
return NS_OK;
}
// Morph it back to a mozBR
lastChild->UnsetAttr(kNameSpaceID_None, kMOZEditorBogusNodeAttrAtom, false);
lastChild->SetAttr(kNameSpaceID_None, nsGkAtoms::type,
NS_LITERAL_STRING("_moz"), true);
return NS_OK;
}
nsresult
nsTextEditRules::CreateBogusNodeIfNeeded(Selection* aSelection)
{
NS_ENSURE_TRUE(aSelection, NS_ERROR_NULL_POINTER);
NS_ENSURE_TRUE(mEditor, NS_ERROR_NULL_POINTER);
if (mBogusNode) {
// Let's not create more than one, ok?
return NS_OK;
}
// tell rules system to not do any post-processing
nsAutoRules beginRulesSniffing(mEditor, EditAction::ignore, nsIEditor::eNone);
nsCOMPtr<dom::Element> body = mEditor->GetRoot();
if (!body) {
// We don't even have a body yet, don't insert any bogus nodes at
// this point.
return NS_OK;
}
// Now we've got the body element. Iterate over the body element's children,
// looking for editable content. If no editable content is found, insert the
// bogus node.
for (nsCOMPtr<nsIContent> bodyChild = body->GetFirstChild();
bodyChild;
bodyChild = bodyChild->GetNextSibling()) {
if (mEditor->IsMozEditorBogusNode(bodyChild) ||
!mEditor->IsEditable(body) || // XXX hoist out of the loop?
mEditor->IsEditable(bodyChild) || mEditor->IsBlockNode(bodyChild)) {
return NS_OK;
}
}
// Skip adding the bogus node if body is read-only.
if (!mEditor->IsModifiableNode(body)) {
return NS_OK;
}
// Create a br.
nsCOMPtr<Element> newContent = mEditor->CreateHTMLContent(nsGkAtoms::br);
NS_ENSURE_STATE(newContent);
// set mBogusNode to be the newly created <br>
mBogusNode = do_QueryInterface(newContent);
NS_ENSURE_TRUE(mBogusNode, NS_ERROR_NULL_POINTER);
// Give it a special attribute.
newContent->SetAttr(kNameSpaceID_None, kMOZEditorBogusNodeAttrAtom,
kMOZEditorBogusNodeValue, false);
// Put the node in the document.
nsCOMPtr<nsIDOMNode> bodyNode = do_QueryInterface(body);
nsresult rv = mEditor->InsertNode(mBogusNode, bodyNode, 0);
NS_ENSURE_SUCCESS(rv, rv);
// Set selection.
aSelection->CollapseNative(body, 0);
return NS_OK;
}
nsresult
nsTextEditRules::TruncateInsertionIfNeeded(Selection* aSelection,
const nsAString *aInString,
nsAString *aOutString,
int32_t aMaxLength,
bool *aTruncated)
{
if (!aSelection || !aInString || !aOutString) {return NS_ERROR_NULL_POINTER;}
nsresult res = NS_OK;
if (!aOutString->Assign(*aInString, mozilla::fallible)) {
return NS_ERROR_OUT_OF_MEMORY;
}
if (aTruncated) {
*aTruncated = false;
}
NS_ENSURE_STATE(mEditor);
if ((-1 != aMaxLength) && IsPlaintextEditor() && !mEditor->IsIMEComposing() )
{
// Get the current text length.
// Get the length of inString.
// Get the length of the selection.
// If selection is collapsed, it is length 0.
// Subtract the length of the selection from the len(doc)
// since we'll delete the selection on insert.
// This is resultingDocLength.
// Get old length of IME composing string
// which will be replaced by new one.
// If (resultingDocLength) is at or over max, cancel the insert
// If (resultingDocLength) + (length of input) > max,
// set aOutString to subset of inString so length = max
int32_t docLength;
res = mEditor->GetTextLength(&docLength);
if (NS_FAILED(res)) { return res; }
int32_t start, end;
nsContentUtils::GetSelectionInTextControl(aSelection, mEditor->GetRoot(),
start, end);
TextComposition* composition = mEditor->GetComposition();
int32_t oldCompStrLength = composition ? composition->String().Length() : 0;
const int32_t selectionLength = end - start;
const int32_t resultingDocLength = docLength - selectionLength - oldCompStrLength;
if (resultingDocLength >= aMaxLength)
{
// This call is guaranteed to reduce the capacity of the string, so it
// cannot cause an OOM.
aOutString->Truncate();
if (aTruncated) {
*aTruncated = true;
}
}
else
{
int32_t oldLength = aOutString->Length();
if (oldLength + resultingDocLength > aMaxLength) {
int32_t newLength = aMaxLength - resultingDocLength;
MOZ_ASSERT(newLength > 0);
char16_t newLastChar = aOutString->CharAt(newLength - 1);
char16_t removingFirstChar = aOutString->CharAt(newLength);
// Don't separate the string between a surrogate pair.
if (NS_IS_HIGH_SURROGATE(newLastChar) &&
NS_IS_LOW_SURROGATE(removingFirstChar)) {
newLength--;
}
// XXX What should we do if we're removing IVS and its preceding
// character won't be removed?
// This call is guaranteed to reduce the capacity of the string, so it
// cannot cause an OOM.
aOutString->Truncate(newLength);
if (aTruncated) {
*aTruncated = true;
}
}
}
}
return res;
}
void
nsTextEditRules::ResetIMETextPWBuf()
{
mPasswordIMEText.Truncate();
}
void
nsTextEditRules::RemoveIMETextFromPWBuf(int32_t &aStart, nsAString *aIMEString)
{
MOZ_ASSERT(aIMEString);
// initialize PasswordIME
if (mPasswordIMEText.IsEmpty()) {
mPasswordIMEIndex = aStart;
}
else {
// manage the password buffer
mPasswordText.Cut(mPasswordIMEIndex, mPasswordIMEText.Length());
aStart = mPasswordIMEIndex;
}
mPasswordIMEText.Assign(*aIMEString);
}
NS_IMETHODIMP nsTextEditRules::Notify(nsITimer *)
{
MOZ_ASSERT(mTimer);
// Check whether our text editor's password flag was changed before this
// "hide password character" timer actually fires.
nsresult res = IsPasswordEditor() ? HideLastPWInput() : NS_OK;
ASSERT_PASSWORD_LENGTHS_EQUAL();
mLastLength = 0;
return res;
}
nsresult nsTextEditRules::HideLastPWInput() {
if (!mLastLength) {
// Special case, we're trying to replace a range that no longer exists
return NS_OK;
}
nsAutoString hiddenText;
FillBufWithPWChars(&hiddenText, mLastLength);
NS_ENSURE_STATE(mEditor);
nsRefPtr<Selection> selection = mEditor->GetSelection();
NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);
int32_t start, end;
nsContentUtils::GetSelectionInTextControl(selection, mEditor->GetRoot(),
start, end);
nsCOMPtr<nsIDOMNode> selNode = GetTextNode(selection, mEditor);
NS_ENSURE_TRUE(selNode, NS_OK);
nsCOMPtr<nsIDOMCharacterData> nodeAsText(do_QueryInterface(selNode));
NS_ENSURE_TRUE(nodeAsText, NS_OK);
nodeAsText->ReplaceData(mLastStart, mLastLength, hiddenText);
selection->Collapse(selNode, start);
if (start != end)
selection->Extend(selNode, end);
return NS_OK;
}
// static
void
nsTextEditRules::FillBufWithPWChars(nsAString *aOutString, int32_t aLength)
{
MOZ_ASSERT(aOutString);
// change the output to the platform password character
char16_t passwordChar = LookAndFeel::GetPasswordCharacter();
int32_t i;
aOutString->Truncate();
for (i=0; i < aLength; i++)
aOutString->Append(passwordChar);
}
///////////////////////////////////////////////////////////////////////////
// CreateMozBR: put a BR node with moz attribute at {aNode, aOffset}
//
nsresult
nsTextEditRules::CreateMozBR(nsIDOMNode* inParent, int32_t inOffset,
nsIDOMNode** outBRNode)
{
NS_ENSURE_TRUE(inParent, NS_ERROR_NULL_POINTER);
nsCOMPtr<nsIDOMNode> brNode;
NS_ENSURE_STATE(mEditor);
nsresult res = mEditor->CreateBR(inParent, inOffset, address_of(brNode));
NS_ENSURE_SUCCESS(res, res);
// give it special moz attr
nsCOMPtr<nsIDOMElement> brElem = do_QueryInterface(brNode);
if (brElem) {
res = mEditor->SetAttribute(brElem, NS_LITERAL_STRING("type"), NS_LITERAL_STRING("_moz"));
NS_ENSURE_SUCCESS(res, res);
}
if (outBRNode) {
brNode.forget(outBRNode);
}
return NS_OK;
}
NS_IMETHODIMP
nsTextEditRules::DocumentModified()
{
return NS_ERROR_NOT_IMPLEMENTED;
}
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