cssstyleselector.cpp

khtml在gtk上的移植版本

    // 6. Check the rules in author sheets next.
    matchRules(m_authorStyle, firstAuthorRule, lastAuthorRule);
    
    // 7. Now check our inline style attribute.
    if (htmlElement) {
        CSSStyleDeclarationImpl* inlineDecl = htmlElement->inlineStyleDecl();
        if (inlineDecl) {
            if (firstAuthorRule == -1) firstAuthorRule = m_matchedDeclCount;
            lastAuthorRule = m_matchedDeclCount;
            addMatchedDeclaration(inlineDecl);
        }
    }
    
    // Now we have all of the matched rules in the appropriate order.  Walk the rules and apply
    // high-priority properties first, i.e., those properties that other properties depend on.
    // The order is (1) high-priority not important, (2) high-priority important, (3) normal not important
    // and (4) normal important.
    applyDeclarations(true, false, 0, m_matchedDeclCount-1);
    applyDeclarations(true, true, firstAuthorRule, lastAuthorRule);
    applyDeclarations(true, true, firstUserRule, lastUserRule);
    applyDeclarations(true, true, firstUARule, lastUARule);
    
    // If our font got dirtied, go ahead and update it now.
    if (fontDirty) {
        checkForTextSizeAdjust();
        checkForGenericFamilyChange(style, parentStyle);
        style->htmlFont().update(paintDeviceMetrics);
        fontDirty = false;
    }
    
    // Now do the normal priority properties.
    applyDeclarations(false, false, 0, m_matchedDeclCount-1);
    applyDeclarations(false, true, firstAuthorRule, lastAuthorRule);
    applyDeclarations(false, true, firstUserRule, lastUserRule);
    applyDeclarations(false, true, firstUARule, lastUARule);
    
    // If our font got dirtied by one of the non-essential font props, 
    // go ahead and update it a second time.
    if (fontDirty) {
        checkForTextSizeAdjust();
        checkForGenericFamilyChange(style, parentStyle);
        style->htmlFont().update(paintDeviceMetrics);
        fontDirty = false;
    }
    
    // Clean up our style object's display and text decorations (among other fixups).
    adjustRenderStyle(style, e);

    // If we are a link, cache the determined pseudo-state.
    if (e->hasAnchor())
        style->setPseudoState(pseudoState);

    // Now return the style.
    return style;
}

RenderStyle* CSSStyleSelector::pseudoStyleForElement(RenderStyle::PseudoId pseudo, 
                                                     ElementImpl* e, RenderStyle* parentStyle)
{
    if (!e)
        return 0;
    
    if (!e->getDocument()->haveStylesheetsLoaded()) {
        if (!styleNotYetAvailable) {
            styleNotYetAvailable = ::new RenderStyle();
            styleNotYetAvailable->setDisplay(NONE);
            styleNotYetAvailable->ref();
        }
        return styleNotYetAvailable;
    }
    
    initElementAndPseudoState(e);
    initForStyleResolve(e, parentStyle);
    pseudoStyle = pseudo;
    
    // Since we don't use pseudo-elements in any of our quirk/print user agent rules, don't waste time walking
    // those rules.
    
    // Check UA, user and author rules.
    int firstUARule = -1, lastUARule = -1, firstUserRule = -1, lastUserRule = -1, firstAuthorRule = -1, lastAuthorRule = -1;
    matchRules(defaultStyle, firstUARule, lastUARule);
    matchRules(m_userStyle, firstUserRule, lastUserRule);
    matchRules(m_authorStyle, firstAuthorRule, lastAuthorRule);
    
    if (m_matchedDeclCount == 0)
        return 0;
    
    style = new (e->getDocument()->renderArena()) RenderStyle();
    if (parentStyle)
        style->inheritFrom(parentStyle);
    else
        parentStyle = style;
    style->noninherited_flags._styleType = pseudoStyle;
    
    // High-priority properties.
    applyDeclarations(true, false, 0, m_matchedDeclCount-1);
    applyDeclarations(true, true, firstAuthorRule, lastAuthorRule);
    applyDeclarations(true, true, firstUserRule, lastUserRule);
    applyDeclarations(true, true, firstUARule, lastUARule);
    
    // If our font got dirtied, go ahead and update it now.
    if (fontDirty) {
        checkForTextSizeAdjust();
        checkForGenericFamilyChange(style, parentStyle);
        style->htmlFont().update(paintDeviceMetrics);
        fontDirty = false;
    }
    
    // Now do the normal priority properties.
    applyDeclarations(false, false, 0, m_matchedDeclCount-1);
    applyDeclarations(false, true, firstAuthorRule, lastAuthorRule);
    applyDeclarations(false, true, firstUserRule, lastUserRule);
    applyDeclarations(false, true, firstUARule, lastUARule);
    
    // If our font got dirtied by one of the non-essential font props, 
    // go ahead and update it a second time.
    if (fontDirty) {
        checkForTextSizeAdjust();
        checkForGenericFamilyChange(style, parentStyle);
        style->htmlFont().update(paintDeviceMetrics);
        fontDirty = false;
    }
    
    // Clean up our style object's display and text decorations (among other fixups).
    adjustRenderStyle(style, 0);

    // Now return the style.
    return style;
}

void CSSStyleSelector::adjustRenderStyle(RenderStyle* style, DOM::ElementImpl *e)
{
    // Cache our original display.
    style->setOriginalDisplay(style->display());

    if (style->display() != NONE) {
        // If we have a <td> that specifies a float property, in quirks mode we just drop the float
        // property.
        // Sites also commonly use display:inline/block on <td>s and <table>s.  In quirks mode we force
        // these tags to retain their display types.
        if (!strictParsing && e) {
            if (e->id() == ID_TD) {
                style->setDisplay(TABLE_CELL);
                style->setFloating(FNONE);
            }
            else if (e->id() == ID_TABLE)
                style->setDisplay(style->isDisplayInlineType() ? INLINE_TABLE : TABLE);
        }

        // Frames and framesets never honor position:relative or position:absolute.  This is necessary to
        // fix a crash where a site tries to position these objects.
        if (e && (e->id() == ID_FRAME || e->id() == ID_FRAMESET))
            style->setPosition(STATIC);

        // Table headers with a text-align of auto will change the text-align to center.
        if (e && e->id() == ID_TH && style->textAlign() == TAAUTO)
            style->setTextAlign(CENTER);
        
        // Mutate the display to BLOCK or TABLE for certain cases, e.g., if someone attempts to
        // position or float an inline, compact, or run-in.  Cache the original display, since it
        // may be needed for positioned elements that have to compute their static normal flow
        // positions.  We also force inline-level roots to be block-level.
        if (style->display() != BLOCK && style->display() != TABLE && style->display() != BOX &&
            (style->position() == ABSOLUTE || style->position() == FIXED || style->floating() != FNONE ||
             (e && e->getDocument()->documentElement() == e))) {
            if (style->display() == INLINE_TABLE)
                style->setDisplay(TABLE);
            else if (style->display() == INLINE_BOX)
                style->setDisplay(BOX);
            else if (style->display() == LIST_ITEM) {
                // It is a WinIE bug that floated list items lose their bullets, so we'll emulate the quirk,
                // but only in quirks mode.
                if (!strictParsing && style->floating() != FNONE)
                    style->setDisplay(BLOCK);
            }
            else
                style->setDisplay(BLOCK);
        }
        
        // After performing the display mutation, check table rows.  We do not honor position:relative on
        // table rows.  This has been established in CSS2.1 (and caused a crash in containingBlock() on
        // some sites).
        if (style->display() == TABLE_ROW && style->position() == RELATIVE)
            style->setPosition(STATIC);
    }

    // Make sure our z-index value is only applied if the object is positioned,
    // relatively positioned, or transparent.
    if (style->position() == STATIC && style->opacity() == 1.0f) {
        if (e && e->getDocument()->documentElement() == e)
            style->setZIndex(0); // The root has a z-index of 0 if not positioned or transparent.
        else
            style->setHasAutoZIndex(); // Everyone else gets an auto z-index.
    }

    // Auto z-index becomes 0 for transparent objects.  This prevents cases where
    // objects that should be blended as a single unit end up with a non-transparent object
    // wedged in between them.
    if (style->opacity() < 1.0f && style->hasAutoZIndex())
        style->setZIndex(0);
    
    // Finally update our text decorations in effect, but don't allow text-decoration to percolate through
    // tables, inline blocks, inline tables, or run-ins.
    if (style->display() == TABLE || style->display() == INLINE_TABLE || style->display() == RUN_IN
        || style->display() == INLINE_BLOCK || style->display() == INLINE_BOX)
        style->setTextDecorationsInEffect(style->textDecoration());
    else
        style->addToTextDecorationsInEffect(style->textDecoration());
}

static bool subject;

bool CSSStyleSelector::checkSelector(CSSSelector* sel, ElementImpl *e)
{
    dynamicPseudo = RenderStyle::NOPSEUDO;
    
    NodeImpl *n = e;

    // we have the subject part of the selector
    subject = true;

    // We track whether or not the rule contains only :hover and :active in a simple selector. If
    // so, we can't allow that to apply to every element on the page.  We assume the author intended
    // to apply the rules only to links.
    bool onlyHoverActive = (sel->tag == anyQName &&
                            (sel->match == CSSSelector::Pseudo &&
                              (sel->pseudoType() == CSSSelector::PseudoHover ||
                               sel->pseudoType() == CSSSelector::PseudoActive)));
    bool affectedByHover = style ? style->affectedByHoverRules() : false;
    bool affectedByActive = style ? style->affectedByActiveRules() : false;
    bool havePseudo = pseudoStyle != RenderStyle::NOPSEUDO;
    
    // first selector has to match
    if (!checkOneSelector(sel, e)) return false;

    // check the subselectors
    CSSSelector::Relation relation = sel->relation;
    while((sel = sel->tagHistory))
    {
        if (!n->isElementNode()) return false;
        if (relation != CSSSelector::SubSelector) {
            subject = false;
            if (havePseudo && dynamicPseudo != pseudoStyle)
                return false;
        }
        
        switch(relation)
        {
        case CSSSelector::Descendant:
        {
            // FIXME: This match needs to know how to backtrack and be non-deterministic.
            bool found = false;
            while(!found)
            {
		n = n->parentNode();
                if(!n || !n->isElementNode()) return false;
                ElementImpl *elem = static_cast<ElementImpl *>(n);
                if (checkOneSelector(sel, elem)) found = true;
            }
            break;
        }
        case CSSSelector::Child:
        {
            n = n->parentNode();
            if (!strictParsing)
                while (n && n->implicitNode()) n = n->parentNode();
            if(!n || !n->isElementNode()) return false;
            ElementImpl *elem = static_cast<ElementImpl *>(n);
            if (!checkOneSelector(sel, elem)) return false;
            break;
        }
        case CSSSelector::Sibling:
        {
            n = n->previousSibling();
	    while( n && !n->isElementNode() )
		n = n->previousSibling();
            if( !n ) return false;
            ElementImpl *elem = static_cast<ElementImpl *>(n);
            if (!checkOneSelector(sel, elem)) return false;
            break;
        }
        case CSSSelector::SubSelector:
	{
            if (onlyHoverActive)
                onlyHoverActive = (sel->match == CSSSelector::Pseudo &&
                                   (sel->pseudoType() == CSSSelector::PseudoHover ||
                                    sel->pseudoType() == CSSSelector::PseudoActive));
            
	    //kdDebug() << "CSSOrderedRule::checkSelector" << endl;
	    ElementImpl *elem = static_cast<ElementImpl *>(n);
	    // a selector is invalid if something follows :first-xxx
	    if (dynamicPseudo != RenderStyle::NOPSEUDO)
		return false;
	    if (!checkOneSelector(sel, elem)) return false;
	    //kdDebug() << "CSSOrderedRule::checkSelector: passed" << endl;
	    break;
	}
        }
        relation = sel->relation;
    }

    if (subject && havePseudo && dynamicPseudo != pseudoStyle)
        return false;
    
    // disallow *:hover, *:active, and *:hover:active except for links
    if (onlyHoverActive && subject) {
        if (pseudoState == PseudoUnknown)
            checkPseudoState(e);

        if (pseudoState == PseudoNone) {
            if (!affectedByHover && style->affectedByHoverRules())
                style->setAffectedByHoverRules(false);
            if (!affectedByActive && style->affectedByActiveRules())
                style->setAffectedByActiveRules(false);
            return false;
        }
    }

    return true;
}

bool CSSStyleSelector::checkOneSelector(DOM::CSSSelector *sel, DOM::ElementImpl *e)
{
    if(!e)
        return false;

    if (sel->tag != anyQName) {
        int eltID = e->id();
        Q_UINT16 localName = localNamePart(eltID);
        Q_UINT16 ns = namespacePart(eltID);
        Q_UINT16 selLocalName = localNamePart(sel->tag);
        Q_UINT16 selNS = namespacePart(sel->tag);
        
        if (selNS == xhtmlNamespace && localName < ID_LAST_TAG)
            selNS = anyNamespace; // Always match HTML elements even when in HTML docs.
        
        if ((selLocalName != anyLocalName && localName != selLocalName) ||
            (selNS != anyNamespace && ns != selNS))
            return false;
    }

    if (sel->attr) {
        if (sel->match == CSSSelector::Class) {
            if (!e->hasClass())
                return false;
            for (const AtomicStringList* c = e->getClassList(); c; c = c->next())
                if (c->string() == sel->value)
                    return true;
            return false;
        }