htmlediting_impl.cpp

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}

//------------------------------------------------------------------------------------------
// ApplyStyleCommandImpl: style-application helpers


bool ApplyStyleCommandImpl::splitTextAtStartIfNeeded(const Position &start, const Position &end)
{
    if (start.node()->isTextNode() && start.offset() > start.node()->caretMinOffset() && start.offset() < start.node()->caretMaxOffset()) {
        long endOffsetAdjustment = start.node() == end.node() ? start.offset() : 0;
        TextImpl *text = static_cast<TextImpl *>(start.node());
        SplitTextNodeCommand cmd(document(), text, start.offset());
        applyCommandToComposite(cmd);
        setEndingSelection(Selection(Position(start.node(), 0), Position(end.node(), end.offset() - endOffsetAdjustment)));
        return true;
    }
    return false;
}

NodeImpl *ApplyStyleCommandImpl::splitTextAtEndIfNeeded(const Position &start, const Position &end)
{
    if (end.node()->isTextNode() && end.offset() > end.node()->caretMinOffset() && end.offset() < end.node()->caretMaxOffset()) {
        TextImpl *text = static_cast<TextImpl *>(end.node());
        SplitTextNodeCommand cmd(document(), text, end.offset());
        applyCommandToComposite(cmd);
        NodeImpl *startNode = start.node() == end.node() ? cmd.node()->previousSibling() : start.node();
        ASSERT(startNode);
        setEndingSelection(Selection(Position(startNode, start.offset()), Position(cmd.node()->previousSibling(), cmd.node()->previousSibling()->caretMaxOffset())));
        return cmd.node()->previousSibling();
    }
    return end.node();
}

void ApplyStyleCommandImpl::surroundNodeRangeWithElement(NodeImpl *startNode, NodeImpl *endNode, ElementImpl *element)
{
    ASSERT(startNode);
    ASSERT(endNode);
    ASSERT(element);
    
    NodeImpl *node = startNode;
    while (1) {
        NodeImpl *next = node->traverseNextNode();
        if (node->childNodeCount() == 0 && node->renderer() && node->renderer()->isInline()) {
            removeNode(node);
            appendNode(element, node);
        }
        if (node == endNode)
            break;
        node = next;
    }
}

void ApplyStyleCommandImpl::applyStyleIfNeeded(DOM::NodeImpl *startNode, DOM::NodeImpl *endNode)
{
    StyleChange styleChange = computeStyleChange(Position(startNode, 0), style());
    int exceptionCode = 0;
    
    if (styleChange.cssStyle.length() > 0) {
        ElementImpl *styleElement = document()->createHTMLElement("SPAN", exceptionCode);
        ASSERT(exceptionCode == 0);
        styleElement->setAttribute(ATTR_STYLE, styleChange.cssStyle);
        styleElement->setAttribute(ATTR_CLASS, styleSpanClassString());
        insertNodeBefore(styleElement, startNode);
        surroundNodeRangeWithElement(startNode, endNode, styleElement);
    }

    if (styleChange.applyBold) {
        ElementImpl *boldElement = document()->createHTMLElement("B", exceptionCode);
        ASSERT(exceptionCode == 0);
        insertNodeBefore(boldElement, startNode);
        surroundNodeRangeWithElement(startNode, endNode, boldElement);
    }

    if (styleChange.applyItalic) {
        ElementImpl *italicElement = document()->createHTMLElement("I", exceptionCode);
        ASSERT(exceptionCode == 0);
        insertNodeBefore(italicElement, startNode);
        surroundNodeRangeWithElement(startNode, endNode, italicElement);
    }
}

bool ApplyStyleCommandImpl::currentlyHasStyle(const Position &pos, const CSSProperty *property) const
{
    ASSERT(pos.notEmpty());
    CSSStyleDeclarationImpl *decl = document()->defaultView()->getComputedStyle(pos.element(), 0);
    ASSERT(decl);
    CSSValueImpl *value = decl->getPropertyCSSValue(property->id());
    return strcasecmp(value->cssText(), property->value()->cssText()) == 0;
}

ApplyStyleCommandImpl::StyleChange ApplyStyleCommandImpl::computeStyleChange(const Position &insertionPoint, CSSStyleDeclarationImpl *style)
{
    ASSERT(insertionPoint.notEmpty());
    ASSERT(style);

    StyleChange styleChange;

    for (QPtrListIterator<CSSProperty> it(*(style->values())); it.current(); ++it) {
        CSSProperty *property = it.current();
        if (!currentlyHasStyle(insertionPoint, property)) {
            switch (property->id()) {
                case CSS_PROP_FONT_WEIGHT:
                    if (strcasecmp(property->value()->cssText(), "bold") == 0)
                        styleChange.applyBold = true;
                    else
                        styleChange.cssStyle += property->cssText();
                    break;
                case CSS_PROP_FONT_STYLE: {
                        DOMString cssText(property->value()->cssText());
                        if (strcasecmp(cssText, "italic") == 0 || strcasecmp(cssText, "oblique") == 0)
                            styleChange.applyItalic = true;
                        else
                            styleChange.cssStyle += property->cssText();
                    }
                    break;
                default:
                    styleChange.cssStyle += property->cssText();
                    break;
            }
        }
    }
    return styleChange;
}

Position ApplyStyleCommandImpl::positionInsertionPoint(Position pos)
{
    if (pos.node()->isTextNode() && (pos.offset() > 0 && pos.offset() < pos.node()->maxOffset())) {
        SplitTextNodeCommand split(document(), static_cast<TextImpl *>(pos.node()), pos.offset());
        split.apply();
        pos = Position(split.node(), 0);
    }

#if 0
    // EDIT FIXME: If modified to work with the internals of applying style,
    // this code can work to optimize cases where a style change is taking place on
    // a boundary between nodes where one of the nodes has the desired style. In other
    // words, it is possible for content to be merged into existing nodes rather than adding
    // additional markup.
    if (currentlyHasStyle(pos))
        return pos;
        
    // try next node
    if (pos.offset() >= pos.node()->caretMaxOffset()) {
        NodeImpl *nextNode = pos.node()->traverseNextNode();
        if (nextNode) {
            Position next = Position(nextNode, 0);
            if (currentlyHasStyle(next))
                return next;
        }
    }

    // try previous node
    if (pos.offset() <= pos.node()->caretMinOffset()) {
        NodeImpl *prevNode = pos.node()->traversePreviousNode();
        if (prevNode) {
            Position prev = Position(prevNode, prevNode->maxOffset());
            if (currentlyHasStyle(prev))
                return prev;
        }
    }
#endif
    
    return pos;
}

//------------------------------------------------------------------------------------------
// DeleteCollapsibleWhitespaceCommandImpl

DeleteCollapsibleWhitespaceCommandImpl::DeleteCollapsibleWhitespaceCommandImpl(DocumentImpl *document)
    : CompositeEditCommandImpl(document), m_charactersDeleted(0), m_hasSelectionToCollapse(false)
{
}

DeleteCollapsibleWhitespaceCommandImpl::DeleteCollapsibleWhitespaceCommandImpl(DocumentImpl *document, const Selection &selection)
    : CompositeEditCommandImpl(document), m_charactersDeleted(0), m_selectionToCollapse(selection), m_hasSelectionToCollapse(true)
{
}

DeleteCollapsibleWhitespaceCommandImpl::~DeleteCollapsibleWhitespaceCommandImpl()
{
}

int DeleteCollapsibleWhitespaceCommandImpl::commandID() const
{
    return DeleteCollapsibleWhitespaceCommandID;
}

static bool shouldDeleteUpstreamPosition(const Position &pos)
{
    if (!pos.node()->isTextNode())
        return false;
        
    RenderObject *renderer = pos.node()->renderer();
    if (!renderer)
        return true;
        
    TextImpl *textNode = static_cast<TextImpl *>(pos.node());
    if (pos.offset() >= (long)textNode->length())
        return false;

    if (pos.isLastRenderedPositionInEditableBlock())
        return false;

    if (pos.isFirstRenderedPositionOnLine() || pos.isLastRenderedPositionOnLine())
        return false;

    RenderText *textRenderer = static_cast<RenderText *>(renderer);

    for (InlineTextBox *box = textRenderer->firstTextBox(); box; box = box->nextTextBox()) {
        if (pos.offset() < box->m_start) {
            return true;
        }
        if (pos.offset() >= box->m_start && pos.offset() < box->m_start + box->m_len)
            return false;
    }
    
    return true;
}

Position DeleteCollapsibleWhitespaceCommandImpl::deleteWhitespace(const Position &pos)
{
    Position upstream = pos.equivalentUpstreamPosition();
    Position downstream = pos.equivalentDownstreamPosition();
    
    bool del = shouldDeleteUpstreamPosition(upstream);

    LOG(Editing, "pos:        %s [%p:%d]\n", getTagName(pos.node()->id()).string().latin1(), pos.node(), pos.offset());
    if (upstream == downstream) {
        LOG(Editing, "same:       %s [%p:%d]\n", getTagName(upstream.node()->id()).string().latin1(), upstream.node(), upstream.offset());
    }
    else {
        LOG(Editing, "upstream:   %s %s [%p:%d]\n", del ? "DELETE" : "SKIP", getTagName(upstream.node()->id()).string().latin1(), upstream.node(), upstream.offset());
        PositionIterator it(upstream);
        for (it.next(); it.current() != downstream; it.next()) {
            if (it.current().node()->isTextNode() && (long)static_cast<TextImpl *>(it.current().node())->length() == it.current().offset())
                LOG(Editing, "   node:    AT END %s [%p:%d]\n", getTagName(it.current().node()->id()).string().latin1(), it.current().node(), it.current().offset());
            else
                LOG(Editing, "   node:    DELETE %s [%p:%d]\n", getTagName(it.current().node()->id()).string().latin1(), it.current().node(), it.current().offset());
        }
        LOG(Editing, "downstream: %s [%p:%d]\n", getTagName(downstream.node()->id()).string().latin1(), downstream.node(), downstream.offset());
    }

    if (upstream == downstream)
        return upstream;
        
    PositionIterator it(upstream);
    Position deleteStart = upstream;
    if (!del) {
        deleteStart = it.peekNext();
        if (deleteStart == downstream)
            return upstream;
    }
    
    Position endingPosition = upstream;
    
    while (it.current() != downstream) {

        Position next = it.peekNext();
        if (next.node() != deleteStart.node()) {
            ASSERT(deleteStart.node()->isTextNode());
            TextImpl *textNode = static_cast<TextImpl *>(deleteStart.node());
            unsigned long count = it.current().offset() - deleteStart.offset();
            if (count == textNode->length()) {
                LOG(Editing, "   removeNodeAndPrune 1: [%p]\n", textNode);
                if (textNode == endingPosition.node())
                    endingPosition = Position(next.node(), next.node()->caretMinOffset());
                removeNodeAndPrune(textNode);
            }
            else {
                LOG(Editing, "   deleteText 1: [%p:%d:%d:%d]\n", textNode, textNode->length(), deleteStart.offset(), it.current().offset() - deleteStart.offset());
                deleteText(textNode, deleteStart.offset(), count);
            }
            deleteStart = next;
        }
        else if (next == downstream) {
            ASSERT(deleteStart.node() == downstream.node());
            ASSERT(downstream.node()->isTextNode());
            TextImpl *textNode = static_cast<TextImpl *>(deleteStart.node());
            unsigned long count = downstream.offset() - deleteStart.offset();
            ASSERT(count <= textNode->length());
            if (count == textNode->length()) {
                LOG(Editing, "   removeNodeAndPrune 2: [%p]\n", textNode);
                removeNodeAndPrune(textNode);
            }
            else {
                LOG(Editing, "   deleteText 2: [%p:%d:%d:%d]\n", textNode, textNode->length(), deleteStart.offset(), count);
                deleteText(textNode, deleteStart.offset(), count);
                m_charactersDeleted = count;
                endingPosition = Position(downstream.node(), downstream.offset() - m_charactersDeleted);
            }
        }
        
        it.setPosition(next);
    }
    
    return endingPosition;
}

void DeleteCollapsibleWhitespaceCommandImpl::doApply()
{
    // If selection has not been set to a custom selection when the command was created,
    // use the current ending selection.
    if (!m_hasSelectionToCollapse)
        m_selectionToCollapse = endingSelection();
    int state = m_selectionToCollapse.state();
    if (state == Selection::CARET) {
        Position endPosition = deleteWhitespace(m_selectionToCollapse.start());
        setEndingSelection(endPosition);
        //LOG(Editing, "-----------------------------------------------------\n");
    }
    else if (state == Selection::RANGE) {
        Position startPosition = deleteWhitespace(m_selectionToCollapse.start());
        // LOG(Editing, "-----------------------------------------------------\n");
        Position endPosition = m_selectionToCollapse.end();
        if (m_charactersDeleted > 0 && startPosition.node() == endPosition.node()) {
            LOG(Editing, "adjust end position by %d\n", m_charactersDeleted);
            endPosition = Position(endPosition.node(), endPosition.offset() - m_charactersDeleted);
        }
        endPosition = deleteWhitespace(endPosition);
        setEndingSelection(Selection(startPosition, endPosition));
        // LOG(Editing, "=====================================================\n");
    }
}

//------------------------------------------------------------------------------------------
// DeleteSelectionCommandImpl

DeleteSelectionCommandImpl::DeleteSelectionCommandImpl(DocumentImpl *document)
    : CompositeEditCommandImpl(document), m_hasSelectionToDelete(false)
{
}

DeleteSelectionCommandImpl::DeleteSelectionCommandImpl(DocumentImpl *document, const Selection &selection)
    : CompositeEditCommandImpl(document), m_selectionToDelete(selection), m_hasSelectionToDelete(true)
{
}

DeleteSelectionCommandImpl::~DeleteSelectionCommandImpl()
{
}
	
int DeleteSelectionCommandImpl::commandID() const
{
    return DeleteSelectionCommandID;
}

void DeleteSelectionCommandImpl::joinTextNodesWithSameStyle()
{
    Selection selection = endingSelection();

    if (selection.state() != Selection::CARET)
        return;

    Position pos(selection.start());
    
    if (!pos.node()->isTextNode())
        return;

    TextImpl *textNode = static_cast<TextImpl *>(pos.node());
    
    if (pos.offset() == 0) {
        PositionIterator it(pos);
        Position prev = it.previous();
        if (prev == pos)
            return;
        if (prev.node()->isTextNode()) {
            TextImpl *prevTextNode = static_cast<TextImpl *>(prev.node());
            if (textNodesAreJoinable(prevTextNode, textNode)) {
                joinTextNodes(prevTextNode, textNode);
                setEndingSelection(Position(textNode, prevTextNode->length()));
            //    LOG(Editing, "joinTextNodesWithSameStyle [1]\n");
            }
        }
    }
    else if (pos.offset() == (long)textNode->length()) {
        PositionIterator it(pos);
        Position next = it.next();
        if (next == pos)