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gecko/editor/libeditor/text/nsTextEditRules.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsTextEditRules.h"
#include "nsEditor.h"
#include "nsTextEditUtils.h"
#include "nsCRT.h"
#include "nsCOMPtr.h"
#include "nsIServiceManager.h"
#include "nsIDOMNode.h"
#include "nsIDOMElement.h"
#include "nsIDOMText.h"
#include "nsIDOMNodeList.h"
#include "nsISelection.h"
#include "nsISelectionPrivate.h"
#include "nsISelectionController.h"
#include "nsIDOMRange.h"
#include "nsIDOMCharacterData.h"
#include "nsIContent.h"
#include "nsIContentIterator.h"
#include "nsEditorUtils.h"
#include "EditTxn.h"
#include "nsEditProperty.h"
#include "nsUnicharUtils.h"
#include "DeleteTextTxn.h"
#include "nsNodeIterator.h"
#include "nsIDOMNodeFilter.h"
// for IBMBIDI
#include "nsFrameSelection.h"
#include "mozilla/Preferences.h"
#include "mozilla/LookAndFeel.h"
#include "mozilla/dom/Element.h"
using namespace mozilla;
#define CANCEL_OPERATION_IF_READONLY_OR_DISABLED \
if (IsReadonly() || IsDisabled()) \
{ \
*aCancel = true; \
return NS_OK; \
};
/********************************************************
* Constructor/Destructor
********************************************************/
nsTextEditRules::nsTextEditRules()
: mEditor(nsnull)
, mPasswordText()
, mPasswordIMEText()
, mPasswordIMEIndex(0)
, mActionNesting(0)
, mLockRulesSniffing(false)
, mDidExplicitlySetInterline(false)
, mTheAction(nsEditor::kOpNone)
, 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_2(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; }
mEditor = aEditor; // we hold a non-refcounted reference back to our editor
nsCOMPtr<nsISelection> selection;
mEditor->GetSelection(getter_AddRefs(selection));
NS_ASSERTION(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.
PRInt32 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::DetachEditor()
{
if (mTimer)
mTimer->Cancel();
mEditor = nsnull;
return NS_OK;
}
NS_IMETHODIMP
nsTextEditRules::BeforeEdit(nsEditor::OperationID 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
nsCOMPtr<nsISelection> selection;
nsresult res = mEditor->GetSelection(getter_AddRefs(selection));
NS_ENSURE_SUCCESS(res, res);
selection->GetAnchorNode(getter_AddRefs(mCachedSelectionNode));
selection->GetAnchorOffset(&mCachedSelectionOffset);
return NS_OK;
}
NS_IMETHODIMP
nsTextEditRules::AfterEdit(nsEditor::OperationID 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)
{
nsCOMPtr<nsISelection>selection;
res = mEditor->GetSelection(getter_AddRefs(selection));
NS_ENSURE_SUCCESS(res, res);
res = mEditor->HandleInlineSpellCheck(action, selection,
mCachedSelectionNode, mCachedSelectionOffset,
nsnull, 0, nsnull, 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(nsISelection *aSelection,
nsRulesInfo *aInfo,
bool *aCancel,
bool *aHandled)
{
// null selection is legal
if (!aInfo || !aCancel || !aHandled) { return NS_ERROR_NULL_POINTER; }
#if defined(DEBUG_ftang)
printf("nsTextEditRules::WillDoAction action= %d", aInfo->action);
#endif
*aCancel = false;
*aHandled = false;
// my kingdom for dynamic cast
nsTextRulesInfo *info = static_cast<nsTextRulesInfo*>(aInfo);
switch (info->action)
{
case nsEditor::kOpInsertBreak:
return WillInsertBreak(aSelection, aCancel, aHandled, info->maxLength);
case nsEditor::kOpInsertText:
case nsEditor::kOpInsertIMEText:
return WillInsertText(info->action,
aSelection,
aCancel,
aHandled,
info->inString,
info->outString,
info->maxLength);
case nsEditor::kOpDeleteSelection:
return WillDeleteSelection(aSelection, info->collapsedAction, aCancel, aHandled);
case nsEditor::kOpUndo:
return WillUndo(aSelection, aCancel, aHandled);
case nsEditor::kOpRedo:
return WillRedo(aSelection, aCancel, aHandled);
case nsEditor::kOpSetTextProperty:
return WillSetTextProperty(aSelection, aCancel, aHandled);
case nsEditor::kOpRemoveTextProperty:
return WillRemoveTextProperty(aSelection, aCancel, aHandled);
case nsEditor::kOpOutputText:
return WillOutputText(aSelection,
info->outputFormat,
info->outString,
aCancel,
aHandled);
case nsEditor::kOpInsertElement:
// 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(nsISelection *aSelection,
nsRulesInfo *aInfo, nsresult aResult)
{
// 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 nsEditor::kOpInsertBreak:
return DidInsertBreak(aSelection, aResult);
case nsEditor::kOpInsertText:
case nsEditor::kOpInsertIMEText:
return DidInsertText(aSelection, aResult);
case nsEditor::kOpDeleteSelection:
return DidDeleteSelection(aSelection, info->collapsedAction, aResult);
case nsEditor::kOpUndo:
return DidUndo(aSelection, aResult);
case nsEditor::kOpRedo:
return DidRedo(aSelection, aResult);
case nsEditor::kOpSetTextProperty:
return DidSetTextProperty(aSelection, aResult);
case nsEditor::kOpRemoveTextProperty:
return DidRemoveTextProperty(aSelection, aResult);
case nsEditor::kOpOutputText:
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 != nsnull);
return NS_OK;
}
/********************************************************
* Protected methods
********************************************************/
nsresult
nsTextEditRules::WillInsert(nsISelection *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)
{
mEditor->DeleteNode(mBogusNode);
mBogusNode = nsnull;
}
return NS_OK;
}
nsresult
nsTextEditRules::DidInsert(nsISelection *aSelection, nsresult aResult)
{
return NS_OK;
}
nsresult
nsTextEditRules::WillInsertBreak(nsISelection *aSelection,
bool *aCancel,
bool *aHandled,
PRInt32 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)
{
res = mEditor->DeleteSelection(nsIEditor::eNone);
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(nsISelection *aSelection, nsresult aResult)
{
return NS_OK;
}
nsresult
nsTextEditRules::CollapseSelectionToTrailingBRIfNeeded(nsISelection* 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;
}
// 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.
PRInt32 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
PRUint32 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 != PRInt32(length))
return NS_OK;
nsCOMPtr<nsIDOMNode> parentNode;
PRInt32 parentOffset;
res = nsEditor::GetNodeLocation(selNode, address_of(parentNode),
&parentOffset);
NS_ENSURE_SUCCESS(res, res);
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(nsISelection *selection, nsEditor *editor) {
PRInt32 selOffset;
nsCOMPtr<nsIDOMNode> selNode;
nsresult res = editor->GetStartNodeAndOffset(selection, getter_AddRefs(selNode), &selOffset);
NS_ENSURE_SUCCESS(res, nsnull);
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, nsnull);
// This should be the root node, walk the tree looking for text nodes
nsNodeIterator iter(node, nsIDOMNodeFilter::SHOW_TEXT, nsnull);
while (!editor->IsTextNode(selNode)) {
if (NS_FAILED(res = iter.NextNode(getter_AddRefs(selNode))) || !selNode) {
return nsnull;
}
}
}
return selNode.forget();
}
#ifdef DEBUG
#define ASSERT_PASSWORD_LENGTHS_EQUAL() \
if (IsPasswordEditor()) { \
PRInt32 txtLen; \
mEditor->GetTextLength(&txtLen); \
NS_ASSERTION(mPasswordText.Length() == PRUint32(txtLen), \
"password length not equal to number of asterisks"); \
}
#else
#define ASSERT_PASSWORD_LENGTHS_EQUAL()
#endif
// static
void
nsTextEditRules::HandleNewLines(nsString &aString,
PRInt32 aNewlineHandling)
{
if (aNewlineHandling < 0) {
PRInt32 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:
{
PRInt32 firstCRLF = aString.FindCharInSet(CRLF);
// we get first *non-empty* line.
PRInt32 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:
{
// find each newline, and strip all the whitespace before
// and after it
PRInt32 firstCRLF = aString.FindCharInSet(CRLF);
while (firstCRLF >= 0)
{
PRUint32 wsBegin = firstCRLF, wsEnd = firstCRLF + 1;
// look backwards for the first non-whitespace char
while (wsBegin > 0 && NS_IS_SPACE(aString[wsBegin - 1]))
--wsBegin;
while (wsEnd < aString.Length() && NS_IS_SPACE(aString[wsEnd]))
++wsEnd;
// now cut this range out of the string
aString.Cut(wsBegin, wsEnd - wsBegin);
// look for another CR or LF
firstCRLF = aString.FindCharInSet(CRLF);
}
}
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(nsEditor::OperationID aAction,
nsISelection *aSelection,
bool *aCancel,
bool *aHandled,
const nsAString *inString,
nsAString *outString,
PRInt32 aMaxLength)
{
if (!aSelection || !aCancel || !aHandled) { return NS_ERROR_NULL_POINTER; }
if (inString->IsEmpty() && aAction != nsEditor::kOpInsertIMEText) {
// 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 != nsEditor::kOpInsertIMEText) {
*aCancel = true;
return NS_OK;
}
PRUint32 start = 0;
PRUint32 end = 0;
// handle password field docs
if (IsPasswordEditor())
{
res = mEditor->GetTextSelectionOffsets(aSelection, start, end);
NS_ASSERTION((NS_SUCCEEDED(res)), "getTextSelectionOffsets failed!");
NS_ENSURE_SUCCESS(res, res);
}
// if the selection isn't collapsed, delete it.
bool bCollapsed;
res = aSelection->GetIsCollapsed(&bCollapsed);
NS_ENSURE_SUCCESS(res, res);
if (!bCollapsed)
{
res = mEditor->DeleteSelection(nsIEditor::eNone);
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 == nsEditor::kOpInsertIMEText) {
res = RemoveIMETextFromPWBuf(start, outString);
NS_ENSURE_SUCCESS(res, res);
}
}
// 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);
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, 600, nsITimer::TYPE_ONE_SHOT);
}
else
{
res = FillBufWithPWChars(outString, outString->Length());
NS_ENSURE_SUCCESS(res, res);
}
}
// get the (collapsed) selection location
nsCOMPtr<nsIDOMNode> selNode;
PRInt32 selOffset;
res = mEditor->GetStartNodeAndOffset(aSelection, getter_AddRefs(selNode), &selOffset);
NS_ENSURE_SUCCESS(res, res);
// don't put text in places that can't have it
if (!mEditor->IsTextNode(selNode) &&
!mEditor->CanContainTag(selNode, nsGkAtoms::textTagName)) {
return NS_ERROR_FAILURE;
}
// we need to get the doc
nsCOMPtr<nsIDOMDocument> doc = mEditor->GetDOMDocument();
NS_ENSURE_TRUE(doc, NS_ERROR_NOT_INITIALIZED);
if (aAction == nsEditor::kOpInsertIMEText) {
res = mEditor->InsertTextImpl(*outString, address_of(selNode), &selOffset, doc);
NS_ENSURE_SUCCESS(res, res);
} else {
// aAction == nsEditor::kOpInsertText; find where we are
nsCOMPtr<nsIDOMNode> curNode = selNode;
PRInt32 curOffset = selOffset;
// don't spaz my selection in subtransactions
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;
nsCOMPtr<nsISelectionPrivate>selPrivate(do_QueryInterface(aSelection));
selPrivate->SetInterlinePosition(endsWithLF);
aSelection->Collapse(curNode, curOffset);
}
}
ASSERT_PASSWORD_LENGTHS_EQUAL()
return res;
}
nsresult
nsTextEditRules::DidInsertText(nsISelection *aSelection,
nsresult aResult)
{
return DidInsert(aSelection, aResult);
}
nsresult
nsTextEditRules::WillSetTextProperty(nsISelection *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(nsISelection *aSelection, nsresult aResult)
{
return NS_OK;
}
nsresult
nsTextEditRules::WillRemoveTextProperty(nsISelection *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(nsISelection *aSelection, nsresult aResult)
{
return NS_OK;
}
nsresult
nsTextEditRules::WillDeleteSelection(nsISelection *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 (IsPasswordEditor())
{
res = mEditor->ExtendSelectionForDelete(aSelection, &aCollapsedAction);
NS_ENSURE_SUCCESS(res, res);
// manage the password buffer
PRUint32 start, end;
mEditor->GetTextSelectionOffsets(aSelection, start, end);
NS_ENSURE_SUCCESS(res, res);
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;
PRInt32 startOffset;
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;
res = mEditor->ExtendSelectionForDelete(aSelection, &aCollapsedAction);
NS_ENSURE_SUCCESS(res, res);
}
res = mEditor->DeleteSelectionImpl(aCollapsedAction);
NS_ENSURE_SUCCESS(res, res);
*aHandled = true;
ASSERT_PASSWORD_LENGTHS_EQUAL()
return NS_OK;
}
nsresult
nsTextEditRules::DidDeleteSelection(nsISelection *aSelection,
nsIEditor::EDirection aCollapsedAction,
nsresult aResult)
{
nsCOMPtr<nsIDOMNode> startNode;
PRInt32 startOffset;
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);
PRUint32 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
nsCOMPtr<nsISelectionPrivate> selPriv = do_QueryInterface(aSelection);
if (selPriv) res = selPriv->SetInterlinePosition(true);
}
return res;
}
nsresult
nsTextEditRules::WillUndo(nsISelection *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(nsISelection *aSelection, nsresult aResult)
{
NS_ENSURE_TRUE(aSelection, NS_ERROR_NULL_POINTER);
// If aResult is an error, we return it.
NS_ENSURE_SUCCESS(aResult, aResult);
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 = nsnull;
}
return aResult;
}
nsresult
nsTextEditRules::WillRedo(nsISelection *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(nsISelection *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))
{
nsCOMPtr<nsIDOMElement> theRoot = do_QueryInterface(mEditor->GetRoot());
NS_ENSURE_TRUE(theRoot, NS_ERROR_FAILURE);
nsCOMPtr<nsIDOMNodeList> nodeList;
res = theRoot->GetElementsByTagName(NS_LITERAL_STRING("br"),
getter_AddRefs(nodeList));
NS_ENSURE_SUCCESS(res, res);
if (nodeList)
{
PRUint32 len;
nodeList->GetLength(&len);
if (len != 1) {
// only in the case of one br could there be the bogus node
mBogusNode = nsnull;
return NS_OK;
}
nsCOMPtr<nsIContent> content = nodeList->GetNodeAt(0);
MOZ_ASSERT(content);
if (mEditor->IsMozEditorBogusNode(content)) {
mBogusNode = do_QueryInterface(content);
} else {
mBogusNode = nsnull;
}
}
}
return res;
}
nsresult
nsTextEditRules::WillOutputText(nsISelection *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(nsISelection *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;
nsRefPtr<dom::Element> body = mEditor->GetRoot();
if (!body)
return NS_ERROR_NULL_POINTER;
PRUint32 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;
}
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->IsHTML(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(nsISelection *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, nsEditor::kOpIgnore, 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)) {
return NS_OK;
}
}
// Skip adding the bogus node if body is read-only.
if (!mEditor->IsModifiableNode(body)) {
return NS_OK;
}
// Create a br.
nsCOMPtr<nsIContent> newContent;
nsresult rv = mEditor->CreateHTMLContent(NS_LITERAL_STRING("br"), getter_AddRefs(newContent));
NS_ENSURE_SUCCESS(rv, rv);
// 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);
rv = mEditor->InsertNode(mBogusNode, bodyNode, 0);
NS_ENSURE_SUCCESS(rv, rv);
// Set selection.
aSelection->CollapseNative(body, 0);
return NS_OK;
}
nsresult
nsTextEditRules::TruncateInsertionIfNeeded(nsISelection *aSelection,
const nsAString *aInString,
nsAString *aOutString,
PRInt32 aMaxLength,
bool *aTruncated)
{
if (!aSelection || !aInString || !aOutString) {return NS_ERROR_NULL_POINTER;}
nsresult res = NS_OK;
*aOutString = *aInString;
if (aTruncated) {
*aTruncated = false;
}
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
PRInt32 docLength;
res = mEditor->GetTextLength(&docLength);
if (NS_FAILED(res)) { return res; }
PRUint32 start, end;
res = mEditor->GetTextSelectionOffsets(aSelection, start, end);
if (NS_FAILED(res)) { return res; }
PRInt32 oldCompStrLength;
res = mEditor->GetIMEBufferLength(&oldCompStrLength);
if (NS_FAILED(res)) { return res; }
const PRInt32 selectionLength = end - start;
const PRInt32 resultingDocLength = docLength - selectionLength - oldCompStrLength;
if (resultingDocLength >= aMaxLength)
{
aOutString->Truncate();
if (aTruncated) {
*aTruncated = true;
}
}
else
{
PRInt32 inCount = aOutString->Length();
if (inCount + resultingDocLength > aMaxLength)
{
aOutString->Truncate(aMaxLength - resultingDocLength);
if (aTruncated) {
*aTruncated = true;
}
}
}
}
return res;
}
nsresult
nsTextEditRules::ResetIMETextPWBuf()
{
mPasswordIMEText.Truncate();
return NS_OK;
}
nsresult
nsTextEditRules::RemoveIMETextFromPWBuf(PRUint32 &aStart, nsAString *aIMEString)
{
if (!aIMEString) {
return NS_ERROR_NULL_POINTER;
}
// initialize PasswordIME
if (mPasswordIMEText.IsEmpty()) {
mPasswordIMEIndex = aStart;
}
else {
// manage the password buffer
mPasswordText.Cut(mPasswordIMEIndex, mPasswordIMEText.Length());
aStart = mPasswordIMEIndex;
}
mPasswordIMEText.Assign(*aIMEString);
return NS_OK;
}
NS_IMETHODIMP nsTextEditRules::Notify(class nsITimer *) {
nsresult res = HideLastPWInput();
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);
nsCOMPtr<nsISelection> selection;
PRUint32 start, end;
nsresult res = mEditor->GetSelection(getter_AddRefs(selection));
NS_ENSURE_SUCCESS(res, res);
res = mEditor->GetTextSelectionOffsets(selection, start, end);
NS_ENSURE_SUCCESS(res, res);
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
nsresult
nsTextEditRules::FillBufWithPWChars(nsAString *aOutString, PRInt32 aLength)
{
if (!aOutString) {return NS_ERROR_NULL_POINTER;}
// change the output to the platform password character
PRUnichar passwordChar = LookAndFeel::GetPasswordCharacter();
PRInt32 i;
aOutString->Truncate();
for (i=0; i < aLength; i++)
aOutString->Append(passwordChar);
return NS_OK;
}
///////////////////////////////////////////////////////////////////////////
// CreateMozBR: put a BR node with moz attribute at {aNode, aOffset}
//
nsresult
nsTextEditRules::CreateMozBR(nsIDOMNode* inParent, PRInt32 inOffset,
nsIDOMNode** outBRNode)
{
NS_ENSURE_TRUE(inParent, NS_ERROR_NULL_POINTER);
nsCOMPtr<nsIDOMNode> brNode;
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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