editor.cpp

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        return;     // DHTML did the whole operation
    if (!canPaste())
        return;
    DocLoader* loader = m_frame->document()->docLoader();
    loader->setAllowStaleResources(true);
    if (m_frame->selection()->isContentRichlyEditable())
        pasteWithPasteboard(Pasteboard::generalPasteboard(), true);
    else
        pasteAsPlainTextWithPasteboard(Pasteboard::generalPasteboard());
    loader->setAllowStaleResources(false);
}

#endif

void Editor::pasteAsPlainText()
{
   if (!canPaste())
        return;
   pasteAsPlainTextWithPasteboard(Pasteboard::generalPasteboard());
}

void Editor::performDelete()
{
    if (!canDelete()) {
        systemBeep();
        return;
    }

    addToKillRing(selectedRange().get(), false);
    deleteSelectionWithSmartDelete(canSmartCopyOrDelete());

    // clear the "start new kill ring sequence" setting, because it was set to true
    // when the selection was updated by deleting the range
    setStartNewKillRingSequence(false);
}

void Editor::copyURL(const KURL& url, const String& title)
{
    Pasteboard::generalPasteboard()->writeURL(url, title, m_frame);
}

void Editor::copyImage(const HitTestResult& result)
{
    KURL url = result.absoluteLinkURL();
    if (url.isEmpty())
        url = result.absoluteImageURL();

    Pasteboard::generalPasteboard()->writeImage(result.innerNonSharedNode(), url, result.altDisplayString());
}

bool Editor::isContinuousSpellCheckingEnabled()
{
    return client() && client()->isContinuousSpellCheckingEnabled();
}

void Editor::toggleContinuousSpellChecking()
{
    if (client())
        client()->toggleContinuousSpellChecking();
}

bool Editor::isGrammarCheckingEnabled()
{
    return client() && client()->isGrammarCheckingEnabled();
}

void Editor::toggleGrammarChecking()
{
    if (client())
        client()->toggleGrammarChecking();
}

int Editor::spellCheckerDocumentTag()
{
    return client() ? client()->spellCheckerDocumentTag() : 0;
}

bool Editor::shouldEndEditing(Range* range)
{
    return client() && client()->shouldEndEditing(range);
}

bool Editor::shouldBeginEditing(Range* range)
{
    return client() && client()->shouldBeginEditing(range);
}

void Editor::clearUndoRedoOperations()
{
    if (client())
        client()->clearUndoRedoOperations();
}

bool Editor::canUndo()
{
    return client() && client()->canUndo();
}

void Editor::undo()
{
    if (client())
        client()->undo();
}

bool Editor::canRedo()
{
    return client() && client()->canRedo();
}

void Editor::redo()
{
    if (client())
        client()->redo();
}

void Editor::didBeginEditing()
{
    if (client())
        client()->didBeginEditing();
}

void Editor::didEndEditing()
{
    if (client())
        client()->didEndEditing();
}

void Editor::didWriteSelectionToPasteboard()
{
    if (client())
        client()->didWriteSelectionToPasteboard();
}

void Editor::toggleBold()
{
    command("ToggleBold").execute();
}

void Editor::toggleUnderline()
{
    command("ToggleUnderline").execute();
}

void Editor::setBaseWritingDirection(WritingDirection direction)
{
    Node* focusedNode = frame()->document()->focusedNode();
    if (focusedNode && (focusedNode->hasTagName(textareaTag)
                        || focusedNode->hasTagName(inputTag) && (static_cast<HTMLInputElement*>(focusedNode)->inputType() == HTMLInputElement::TEXT
                                                                || static_cast<HTMLInputElement*>(focusedNode)->inputType() == HTMLInputElement::SEARCH))) {
        if (direction == NaturalWritingDirection)
            return;
        static_cast<HTMLElement*>(focusedNode)->setAttribute(dirAttr, direction == LeftToRightWritingDirection ? "ltr" : "rtl");
        frame()->document()->updateRendering();
        return;
    }

    RefPtr<CSSMutableStyleDeclaration> style = CSSMutableStyleDeclaration::create();
    style->setProperty(CSSPropertyDirection, direction == LeftToRightWritingDirection ? "ltr" : direction == RightToLeftWritingDirection ? "rtl" : "inherit", false);
    applyParagraphStyleToSelection(style.get(), EditActionSetWritingDirection);
}

void Editor::selectComposition()
{
    RefPtr<Range> range = compositionRange();
    if (!range)
        return;
    
    // The composition can start inside a composed character sequence, so we have to override checks.
    // See <http://bugs.webkit.org/show_bug.cgi?id=15781>
    VisibleSelection selection;
    selection.setWithoutValidation(range->startPosition(), range->endPosition());
    m_frame->selection()->setSelection(selection, false, false);
}

void Editor::confirmComposition()
{
    if (!m_compositionNode)
        return;
    confirmComposition(m_compositionNode->data().substring(m_compositionStart, m_compositionEnd - m_compositionStart), false);
}

void Editor::confirmCompositionWithoutDisturbingSelection()
{
    if (!m_compositionNode)
        return;
    confirmComposition(m_compositionNode->data().substring(m_compositionStart, m_compositionEnd - m_compositionStart), true);
}

void Editor::confirmComposition(const String& text)
{
    confirmComposition(text, false);
}

void Editor::confirmComposition(const String& text, bool preserveSelection)
{
    setIgnoreCompositionSelectionChange(true);

    VisibleSelection oldSelection = m_frame->selection()->selection();

    selectComposition();

    if (m_frame->selection()->isNone()) {
        setIgnoreCompositionSelectionChange(false);
        return;
    }
    
    // If text is empty, then delete the old composition here.  If text is non-empty, InsertTextCommand::input
    // will delete the old composition with an optimized replace operation.
    if (text.isEmpty())
        TypingCommand::deleteSelection(m_frame->document(), false);

    m_compositionNode = 0;
    m_customCompositionUnderlines.clear();

    insertText(text, 0);

    if (preserveSelection)
        m_frame->selection()->setSelection(oldSelection, false, false);

    setIgnoreCompositionSelectionChange(false);
}

void Editor::setComposition(const String& text, const Vector<CompositionUnderline>& underlines, unsigned selectionStart, unsigned selectionEnd)
{
    setIgnoreCompositionSelectionChange(true);

    selectComposition();

    if (m_frame->selection()->isNone()) {
        setIgnoreCompositionSelectionChange(false);
        return;
    }
    
    // If text is empty, then delete the old composition here.  If text is non-empty, InsertTextCommand::input
    // will delete the old composition with an optimized replace operation.
    if (text.isEmpty())
        TypingCommand::deleteSelection(m_frame->document(), false);

    m_compositionNode = 0;
    m_customCompositionUnderlines.clear();

    if (!text.isEmpty()) {
        TypingCommand::insertText(m_frame->document(), text, true, true);

        Node* baseNode = m_frame->selection()->base().node();
        unsigned baseOffset = m_frame->selection()->base().offset();
        Node* extentNode = m_frame->selection()->extent().node();
        unsigned extentOffset = m_frame->selection()->extent().offset();

        if (baseNode && baseNode == extentNode && baseNode->isTextNode() && baseOffset + text.length() == extentOffset) {
            m_compositionNode = static_cast<Text*>(baseNode);
            m_compositionStart = baseOffset;
            m_compositionEnd = extentOffset;
            m_customCompositionUnderlines = underlines;
            size_t numUnderlines = m_customCompositionUnderlines.size();
            for (size_t i = 0; i < numUnderlines; ++i) {
                m_customCompositionUnderlines[i].startOffset += baseOffset;
                m_customCompositionUnderlines[i].endOffset += baseOffset;
            }
            if (baseNode->renderer())
                baseNode->renderer()->repaint();

            unsigned start = min(baseOffset + selectionStart, extentOffset);
            unsigned end = min(max(start, baseOffset + selectionEnd), extentOffset);
            RefPtr<Range> selectedRange = Range::create(baseNode->document(), baseNode, start, baseNode, end);                
            m_frame->selection()->setSelectedRange(selectedRange.get(), DOWNSTREAM, false);
        }
    }

    setIgnoreCompositionSelectionChange(false);
}

void Editor::ignoreSpelling()
{
    if (!client())
        return;
        
    RefPtr<Range> selectedRange = frame()->selection()->toNormalizedRange();
    if (selectedRange)
        frame()->document()->removeMarkers(selectedRange.get(), DocumentMarker::Spelling);

    String text = frame()->selectedText();
    ASSERT(text.length() != 0);
    client()->ignoreWordInSpellDocument(text);
}

void Editor::learnSpelling()
{
    if (!client())
        return;
        
    // FIXME: We don't call this on the Mac, and it should remove misppelling markers around the 
    // learned word, see <rdar://problem/5396072>.

    String text = frame()->selectedText();
    ASSERT(text.length() != 0);
    client()->learnWord(text);
}

static String findFirstMisspellingInRange(EditorClient* client, Range* searchRange, int& firstMisspellingOffset, bool markAll)
{
    ASSERT_ARG(client, client);
    ASSERT_ARG(searchRange, searchRange);
    
    WordAwareIterator it(searchRange);
    firstMisspellingOffset = 0;
    
    String firstMisspelling;
    int currentChunkOffset = 0;

    while (!it.atEnd()) {
        const UChar* chars = it.characters();
        int len = it.length();
        
        // Skip some work for one-space-char hunks
        if (!(len == 1 && chars[0] == ' ')) {
            
            int misspellingLocation = -1;
            int misspellingLength = 0;
            client->checkSpellingOfString(chars, len, &misspellingLocation, &misspellingLength);

            // 5490627 shows that there was some code path here where the String constructor below crashes.
            // We don't know exactly what combination of bad input caused this, so we're making this much
            // more robust against bad input on release builds.
            ASSERT(misspellingLength >= 0);
            ASSERT(misspellingLocation >= -1);
            ASSERT(misspellingLength == 0 || misspellingLocation >= 0);
            ASSERT(misspellingLocation < len);
            ASSERT(misspellingLength <= len);
            ASSERT(misspellingLocation + misspellingLength <= len);
            
            if (misspellingLocation >= 0 && misspellingLength > 0 && misspellingLocation < len && misspellingLength <= len && misspellingLocation + misspellingLength <= len) {
                
                // Remember first-encountered misspelling and its offset
                if (!firstMisspelling) {
                    firstMisspellingOffset = currentChunkOffset + misspellingLocation;
                    firstMisspelling = String(chars + misspellingLocation, misspellingLength);
                }
                
                // Mark this instance if we're marking all instances. Otherwise bail out because we found the first one.
                if (!markAll)
                    break;
                
                // Compute range of misspelled word
                RefPtr<Range> misspellingRange = TextIterator::subrange(searchRange, currentChunkOffset + misspellingLocation, misspellingLength);
                
                // Store marker for misspelled word
                ExceptionCode ec = 0;
                misspellingRange->startContainer(ec)->document()->addMarker(misspellingRange.get(), DocumentMarker::Spelling);