/*
 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
 *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
 * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
 * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All rights reserved.
 * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
 * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
 * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
 * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
 * Copyright (C) Research In Motion Limited 2011. All rights reserved.
 * Copyright (C) 2012 Google Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#include "config.h"
#include "StyleResolver.h"

#include "Attribute.h"
#include "CSSBorderImage.h"
#include "CSSCalculationValue.h"
#include "CSSCursorImageValue.h"
#include "CSSDefaultStyleSheets.h"
#include "CSSFontFaceRule.h"
#include "CSSFontSelector.h"
#include "CSSLineBoxContainValue.h"
#include "CSSPageRule.h"
#include "CSSParser.h"
#include "CSSPrimitiveValueMappings.h"
#include "CSSPropertyNames.h"
#include "CSSReflectValue.h"
#include "CSSSelector.h"
#include "CSSSelectorList.h"
#include "CSSStyleRule.h"
#include "CSSSupportsRule.h"
#include "CSSTimingFunctionValue.h"
#include "CSSToStyleMap.h"
#include "CSSValueList.h"
#if ENABLE(CSS_VARIABLES)
#include "CSSVariableValue.h"
#endif
#include "CachedImage.h"
#include "CalculationValue.h"
#include "ContentData.h"
#include "ContextFeatures.h"
#include "Counter.h"
#include "CounterContent.h"
#include "CursorList.h"
#include "DocumentStyleSheetCollection.h"
#include "ElementShadow.h"
#include "FontFeatureValue.h"
#include "FontValue.h"
#include "Frame.h"
#include "FrameSelection.h"
#include "FrameView.h"
#include "HTMLDocument.h"
#include "HTMLIFrameElement.h"
#include "HTMLInputElement.h"
#include "HTMLNames.h"
#include "HTMLOptionElement.h"
#include "HTMLProgressElement.h"
#include "HTMLStyleElement.h"
#include "HTMLTextAreaElement.h"
#include "InsertionPoint.h"
#include "InspectorInstrumentation.h"
#include "KeyframeList.h"
#include "LinkHash.h"
#include "LocaleToScriptMapping.h"
#include "MathMLNames.h"
#include "Matrix3DTransformOperation.h"
#include "MatrixTransformOperation.h"
#include "MediaList.h"
#include "MediaQueryEvaluator.h"
#include "NodeRenderStyle.h"
#include "NodeRenderingContext.h"
#include "Page.h"
#include "Pair.h"
#include "PerspectiveTransformOperation.h"
#include "QuotesData.h"
#include "Rect.h"
#include "RenderRegion.h"
#include "RenderScrollbar.h"
#include "RenderScrollbarTheme.h"
#include "RenderStyleConstants.h"
#include "RenderTheme.h"
#include "RenderView.h"
#include "RotateTransformOperation.h"
#include "RuleSet.h"
#include "SVGDocumentExtensions.h"
#include "SVGFontFaceElement.h"
#include "ScaleTransformOperation.h"
#include "SecurityOrigin.h"
#include "Settings.h"
#include "ShadowData.h"
#include "ShadowRoot.h"
#include "ShadowValue.h"
#include "SiblingTraversalStrategies.h"
#include "SkewTransformOperation.h"
#include "StyleBuilder.h"
#include "StyleCachedImage.h"
#include "StyleGeneratedImage.h"
#include "StylePendingImage.h"
#include "StyleRule.h"
#include "StyleRuleImport.h"
#include "StyleSheetContents.h"
#include "StyleSheetList.h"
#include "Text.h"
#include "TransformationMatrix.h"
#include "TranslateTransformOperation.h"
#include "UserAgentStyleSheets.h"
#include "ViewportStyleResolver.h"
#include "VisitedLinkState.h"
#include "WebCoreMemoryInstrumentation.h"
#include "WebKitCSSKeyframeRule.h"
#include "WebKitCSSKeyframesRule.h"
#include "WebKitCSSRegionRule.h"
#include "WebKitCSSTransformValue.h"
#include "WebKitFontFamilyNames.h"
#include "XMLNames.h"
#include <wtf/MemoryInstrumentationHashMap.h>
#include <wtf/MemoryInstrumentationHashSet.h>
#include <wtf/MemoryInstrumentationVector.h>
#include <wtf/StdLibExtras.h>
#include <wtf/Vector.h>

#if ENABLE(CSS_FILTERS)
#include "FilterOperation.h"
#include "WebKitCSSFilterValue.h"
#endif

#if ENABLE(DASHBOARD_SUPPORT)
#include "DashboardRegion.h"
#endif

#if ENABLE(SVG)
#include "CachedSVGDocument.h"
#include "CachedSVGDocumentReference.h"
#include "SVGDocument.h"
#include "SVGElement.h"
#include "SVGNames.h"
#include "SVGURIReference.h"
#include "WebKitCSSSVGDocumentValue.h"
#endif

#if ENABLE(CSS_SHADERS)
#include "CustomFilterArrayParameter.h"
#include "CustomFilterConstants.h"
#include "CustomFilterNumberParameter.h"
#include "CustomFilterOperation.h"
#include "CustomFilterParameter.h"
#include "CustomFilterTransformParameter.h"
#include "StyleCachedShader.h"
#include "StyleCustomFilterProgram.h"
#include "StylePendingShader.h"
#include "StyleShader.h"
#include "WebKitCSSMixFunctionValue.h"
#include "WebKitCSSShaderValue.h"
#endif

#if ENABLE(CSS_IMAGE_SET)
#include "CSSImageSetValue.h"
#include "StyleCachedImageSet.h"
#endif

#if ENABLE(VIDEO_TRACK)
#include "WebVTTElement.h"
#endif

using namespace std;

namespace WTF {

template<> struct SequenceMemoryInstrumentationTraits<const WebCore::RuleData*> {
    template <typename I> static void reportMemoryUsage(I, I, MemoryClassInfo&) { }
};

}

namespace WebCore {

using namespace HTMLNames;

#define HANDLE_INHERIT(prop, Prop) \
if (isInherit) { \
    state.style()->set##Prop(state.parentStyle()->prop());  \
    return; \
}

#define HANDLE_INHERIT_AND_INITIAL(prop, Prop) \
HANDLE_INHERIT(prop, Prop) \
if (isInitial) { \
    state.style()->set##Prop(RenderStyle::initial##Prop()); \
    return; \
}

RenderStyle* StyleResolver::s_styleNotYetAvailable;

static StylePropertySet* leftToRightDeclaration()
{
    DEFINE_STATIC_LOCAL(RefPtr<StylePropertySet>, leftToRightDecl, (StylePropertySet::create()));
    if (leftToRightDecl->isEmpty())
        leftToRightDecl->setProperty(CSSPropertyDirection, CSSValueLtr);
    return leftToRightDecl.get();
}

static StylePropertySet* rightToLeftDeclaration()
{
    DEFINE_STATIC_LOCAL(RefPtr<StylePropertySet>, rightToLeftDecl, (StylePropertySet::create()));
    if (rightToLeftDecl->isEmpty())
        rightToLeftDecl->setProperty(CSSPropertyDirection, CSSValueRtl);
    return rightToLeftDecl.get();
}

inline StaticCSSRuleList* StyleResolver::State::ensureRuleList()
{
    if (!m_ruleList)
        m_ruleList = StaticCSSRuleList::create();
    return m_ruleList.get();
}

inline void StyleResolver::State::cacheBorderAndBackground()
{
    m_hasUAAppearance = m_style->hasAppearance();
    if (m_hasUAAppearance) {
        m_borderData = m_style->border();
        m_backgroundData = *m_style->backgroundLayers();
        m_backgroundColor = m_style->backgroundColor();
    }
}

inline void StyleResolver::State::clear()
{
    m_element = 0;
    m_styledElement = 0;
    m_parentStyle = 0;
    m_parentNode = 0;
    m_regionForStyling = 0;
    m_ruleList = 0;
    m_matchedRules.clear();
    m_pendingImageProperties.clear();
#if ENABLE(CSS_SHADERS)
    m_hasPendingShaders = false;
#endif
#if ENABLE(CSS_FILTERS) && ENABLE(SVG)
    m_pendingSVGDocuments.clear();
#endif
}

StyleResolver::StyleResolver(Document* document, bool matchAuthorAndUserStyles)
    : m_matchedPropertiesCacheAdditionsSinceLastSweep(0)
    , m_matchedPropertiesCacheSweepTimer(this, &StyleResolver::sweepMatchedPropertiesCache)
    , m_document(document)
    , m_matchAuthorAndUserStyles(matchAuthorAndUserStyles)
    , m_fontSelector(CSSFontSelector::create(document))
#if ENABLE(CSS_DEVICE_ADAPTATION)
    , m_viewportStyleResolver(ViewportStyleResolver::create(document))
#endif
    , m_styleBuilder(StyleBuilder::sharedStyleBuilder())
{
    Element* root = document->documentElement();

    CSSDefaultStyleSheets::initDefaultStyle(root);

    // construct document root element default style. this is needed
    // to evaluate media queries that contain relative constraints, like "screen and (max-width: 10em)"
    // This is here instead of constructor, because when constructor is run,
    // document doesn't have documentElement
    // NOTE: this assumes that element that gets passed to styleForElement -call
    // is always from the document that owns the style selector
    FrameView* view = document->view();
    if (view)
        m_medium = adoptPtr(new MediaQueryEvaluator(view->mediaType()));
    else
        m_medium = adoptPtr(new MediaQueryEvaluator("all"));

    if (root)
        m_rootDefaultStyle = styleForElement(root, 0, DisallowStyleSharing, MatchOnlyUserAgentRules);

    if (m_rootDefaultStyle && view)
        m_medium = adoptPtr(new MediaQueryEvaluator(view->mediaType(), view->frame(), m_rootDefaultStyle.get()));

    m_ruleSets.resetAuthorStyle();

    DocumentStyleSheetCollection* styleSheetCollection = document->styleSheetCollection();
    m_ruleSets.initUserStyle(styleSheetCollection, *m_medium, *this);

#if ENABLE(SVG_FONTS)
    if (document->svgExtensions()) {
        const HashSet<SVGFontFaceElement*>& svgFontFaceElements = document->svgExtensions()->svgFontFaceElements();
        HashSet<SVGFontFaceElement*>::const_iterator end = svgFontFaceElements.end();
        for (HashSet<SVGFontFaceElement*>::const_iterator it = svgFontFaceElements.begin(); it != end; ++it)
            fontSelector()->addFontFaceRule((*it)->fontFaceRule());
    }
#endif

    appendAuthorStyleSheets(0, styleSheetCollection->activeAuthorStyleSheets());
}

void StyleResolver::appendAuthorStyleSheets(unsigned firstNew, const Vector<RefPtr<CSSStyleSheet> >& styleSheets)
{
    m_ruleSets.appendAuthorStyleSheets(firstNew, styleSheets, m_medium.get(), m_inspectorCSSOMWrappers, document()->isViewSource(), this);
    if (document()->renderer() && document()->renderer()->style())
        document()->renderer()->style()->font().update(fontSelector());

#if ENABLE(CSS_DEVICE_ADAPTATION)
    viewportStyleResolver()->resolve();
#endif
}

void StyleResolver::pushParentElement(Element* parent)
{
    const ContainerNode* parentsParent = parent->parentOrShadowHostElement();

    // We are not always invoked consistently. For example, script execution can cause us to enter
    // style recalc in the middle of tree building. We may also be invoked from somewhere within the tree.
    // Reset the stack in this case, or if we see a new root element.
    // Otherwise just push the new parent.
    if (!parentsParent || m_selectorFilter.parentStackIsEmpty())
        m_selectorFilter.setupParentStack(parent);
    else
        m_selectorFilter.pushParent(parent);

    // Note: We mustn't skip ShadowRoot nodes for the scope stack.
    if (m_scopeResolver)
        m_scopeResolver->push(parent, parent->parentOrShadowHostNode());
}

void StyleResolver::popParentElement(Element* parent)
{
    // Note that we may get invoked for some random elements in some wacky cases during style resolve.
    // Pause maintaining the stack in this case.
    if (m_selectorFilter.parentStackIsConsistent(parent))
        m_selectorFilter.popParent();
    if (m_scopeResolver)
        m_scopeResolver->pop(parent);
}

void StyleResolver::pushParentShadowRoot(const ShadowRoot* shadowRoot)
{
    ASSERT(shadowRoot->host());
    if (m_scopeResolver)
        m_scopeResolver->push(shadowRoot, shadowRoot->host());
}

void StyleResolver::popParentShadowRoot(const ShadowRoot* shadowRoot)
{
    ASSERT(shadowRoot->host());
    if (m_scopeResolver)
        m_scopeResolver->pop(shadowRoot);
}

// This is a simplified style setting function for keyframe styles
void StyleResolver::addKeyframeStyle(PassRefPtr<StyleRuleKeyframes> rule)
{
    AtomicString s(rule->name());
    m_keyframesRuleMap.set(s.impl(), rule);
}

StyleResolver::~StyleResolver()
{
    m_fontSelector->clearDocument();

#if ENABLE(CSS_DEVICE_ADAPTATION)
    m_viewportStyleResolver->clearDocument();
#endif
}

void StyleResolver::sweepMatchedPropertiesCache(Timer<StyleResolver>*)
{
    // Look for cache entries containing a style declaration with a single ref and remove them.
    // This may happen when an element attribute mutation causes it to generate a new inlineStyle()
    // or presentationAttributeStyle(), potentially leaving this cache with the last ref on the old one.
    Vector<unsigned, 16> toRemove;
    MatchedPropertiesCache::iterator it = m_matchedPropertiesCache.begin();
    MatchedPropertiesCache::iterator end = m_matchedPropertiesCache.end();
    for (; it != end; ++it) {
        Vector<MatchedProperties>& matchedProperties = it->value.matchedProperties;
        for (size_t i = 0; i < matchedProperties.size(); ++i) {
            if (matchedProperties[i].properties->hasOneRef()) {
                toRemove.append(it->key);
                break;
            }
        }
    }
    for (size_t i = 0; i < toRemove.size(); ++i)
        m_matchedPropertiesCache.remove(toRemove[i]);

    m_matchedPropertiesCacheAdditionsSinceLastSweep = 0;
}

void StyleResolver::addMatchedProperties(MatchResult& matchResult, const StylePropertySet* properties, StyleRule* rule, unsigned linkMatchType, PropertyWhitelistType propertyWhitelistType)
{
    matchResult.matchedProperties.grow(matchResult.matchedProperties.size() + 1);
    MatchedProperties& newProperties = matchResult.matchedProperties.last();
    newProperties.properties = const_cast<StylePropertySet*>(properties);
    newProperties.linkMatchType = linkMatchType;
    newProperties.whitelistType = propertyWhitelistType;
    matchResult.matchedRules.append(rule);
}

inline void StyleResolver::addElementStyleProperties(MatchResult& result, const StylePropertySet* propertySet, bool isCacheable)
{
    if (!propertySet)
        return;
    result.ranges.lastAuthorRule = result.matchedProperties.size();
    if (result.ranges.firstAuthorRule == -1)
        result.ranges.firstAuthorRule = result.ranges.lastAuthorRule;
    addMatchedProperties(result, propertySet);
    if (!isCacheable)
        result.isCacheable = false;
}

class MatchingUARulesScope {
public:
    MatchingUARulesScope();
    ~MatchingUARulesScope();

    static bool isMatchingUARules();

private:
    static bool m_matchingUARules;
};

MatchingUARulesScope::MatchingUARulesScope()
{
    ASSERT(!m_matchingUARules);
    m_matchingUARules = true;
}

MatchingUARulesScope::~MatchingUARulesScope()
{
    m_matchingUARules = false;
}

inline bool MatchingUARulesScope::isMatchingUARules()
{
    return m_matchingUARules;
}

bool MatchingUARulesScope::m_matchingUARules = false;

void StyleResolver::collectMatchingRules(State& state, const MatchRequest& matchRequest, RuleRange& ruleRange)
{
    ASSERT(matchRequest.ruleSet);
    ASSERT(state.element());

    Element* element = state.element();
    const StyledElement* styledElement = state.styledElement();
    const AtomicString& pseudoId = element->shadowPseudoId();
    if (!pseudoId.isEmpty()) {
        ASSERT(styledElement);
        collectMatchingRulesForList(state, matchRequest.ruleSet->shadowPseudoElementRules(pseudoId.impl()), matchRequest, ruleRange);
    }

#if ENABLE(VIDEO_TRACK)
    if (element->isWebVTTElement())
        collectMatchingRulesForList(state, matchRequest.ruleSet->cuePseudoRules(), matchRequest, ruleRange);
#endif
    // Check whether other types of rules are applicable in the current tree scope. Criteria for this:
    // a) it's a UA rule
    // b) the tree scope allows author rules
    // c) the rules comes from a scoped style sheet within the same tree scope
    TreeScope* treeScope = element->treeScope();
    if (!MatchingUARulesScope::isMatchingUARules()
        && !treeScope->applyAuthorStyles()
        && (!matchRequest.scope || matchRequest.scope->treeScope() != treeScope)
        && matchRequest.behaviorAtBoundary == SelectorChecker::DoesNotCrossBoundary)
        return;

    // We need to collect the rules for id, class, tag, and everything else into a buffer and
    // then sort the buffer.
    if (element->hasID())
        collectMatchingRulesForList(state, matchRequest.ruleSet->idRules(element->idForStyleResolution().impl()), matchRequest, ruleRange);
    if (styledElement && styledElement->hasClass()) {
        for (size_t i = 0; i < styledElement->classNames().size(); ++i)
            collectMatchingRulesForList(state, matchRequest.ruleSet->classRules(styledElement->classNames()[i].impl()), matchRequest, ruleRange);
    }

    if (element->isLink())
        collectMatchingRulesForList(state, matchRequest.ruleSet->linkPseudoClassRules(), matchRequest, ruleRange);
    if (SelectorChecker::matchesFocusPseudoClass(element))
        collectMatchingRulesForList(state, matchRequest.ruleSet->focusPseudoClassRules(), matchRequest, ruleRange);
    collectMatchingRulesForList(state, matchRequest.ruleSet->tagRules(element->localName().impl()), matchRequest, ruleRange);
    collectMatchingRulesForList(state, matchRequest.ruleSet->universalRules(), matchRequest, ruleRange);
}

void StyleResolver::collectMatchingRulesForRegion(State& state, const MatchRequest& matchRequest, RuleRange& ruleRange)
{
    if (!state.regionForStyling())
        return;

    unsigned size = matchRequest.ruleSet->m_regionSelectorsAndRuleSets.size();
    for (unsigned i = 0; i < size; ++i) {
        const CSSSelector* regionSelector = matchRequest.ruleSet->m_regionSelectorsAndRuleSets.at(i).selector;
        if (checkRegionSelector(regionSelector, static_cast<Element*>(state.regionForStyling()->node()))) {
            RuleSet* regionRules = matchRequest.ruleSet->m_regionSelectorsAndRuleSets.at(i).ruleSet.get();
            ASSERT(regionRules);
            collectMatchingRules(state, MatchRequest(regionRules, matchRequest.includeEmptyRules, matchRequest.scope), ruleRange);
        }
    }
}

void StyleResolver::sortAndTransferMatchedRules(State& state, MatchResult& result)
{
    Vector<const RuleData*, 32>& matchedRules = state.matchedRules();
    if (matchedRules.isEmpty())
        return;

    sortMatchedRules(state);

    if (state.mode() == SelectorChecker::CollectingRules) {
        for (unsigned i = 0; i < matchedRules.size(); ++i)
            state.ensureRuleList()->rules().append(matchedRules[i]->rule()->createCSSOMWrapper());
        return;
    }

    // Now transfer the set of matched rules over to our list of declarations.
    for (unsigned i = 0; i < matchedRules.size(); i++) {
        if (state.style() && matchedRules[i]->containsUncommonAttributeSelector())
            state.style()->setUnique();
        addMatchedProperties(result, matchedRules[i]->rule()->properties(), matchedRules[i]->rule(), matchedRules[i]->linkMatchType(), matchedRules[i]->propertyWhitelistType());
    }
}

void StyleResolver::matchScopedAuthorRules(State& state, MatchResult& result, bool includeEmptyRules)
{
#if ENABLE(STYLE_SCOPED) || ENABLE(SHADOW_DOM)
    if (!m_scopeResolver)
        return;

    // Match scoped author rules by traversing the scoped element stack (rebuild it if it got inconsistent).
    if (m_scopeResolver->hasScopedStyles() && m_scopeResolver->ensureStackConsistency(state.element())) {
        bool applyAuthorStyles = state.element()->treeScope()->applyAuthorStyles();
        bool documentScope = true;
        unsigned scopeSize = m_scopeResolver->stackSize();
        for (unsigned i = 0; i < scopeSize; ++i) {
            state.matchedRules().clear();
            result.ranges.lastAuthorRule = result.matchedProperties.size() - 1;

            const StyleScopeResolver::StackFrame& frame = m_scopeResolver->stackFrameAt(i);
            documentScope = documentScope && !frame.m_scope->isInShadowTree();
            if (documentScope) {
                if (!applyAuthorStyles)
                    continue;
            } else {
                if (!m_scopeResolver->matchesStyleBounds(frame))
                    continue;
            }

            MatchRequest matchRequest(frame.m_ruleSet, includeEmptyRules, frame.m_scope);
            RuleRange ruleRange = result.ranges.authorRuleRange();
            collectMatchingRules(state, matchRequest, ruleRange);
            collectMatchingRulesForRegion(state, matchRequest, ruleRange);
            sortAndTransferMatchedRules(state, result);
        }
    }

    matchHostRules(state, result, includeEmptyRules);
#else
    UNUSED_PARAM(state);
    UNUSED_PARAM(result);
    UNUSED_PARAM(includeEmptyRules);
#endif
}

inline bool StyleResolver::styleSharingCandidateMatchesHostRules(State& state)
{
#if ENABLE(SHADOW_DOM)
    return m_scopeResolver && m_scopeResolver->styleSharingCandidateMatchesHostRules(state.element());
#else
    return false;
    UNUSED_PARAM(state);
#endif
}

void StyleResolver::matchHostRules(State& state, MatchResult& result, bool includeEmptyRules)
{
#if ENABLE(SHADOW_DOM)
    ASSERT(m_scopeResolver);

    state.matchedRules().clear();
    result.ranges.lastAuthorRule = result.matchedProperties.size() - 1;

    Vector<RuleSet*> matchedRules;
    m_scopeResolver->matchHostRules(state.element(), matchedRules);
    if (matchedRules.isEmpty())
        return;

    for (unsigned i = matchedRules.size(); i > 0; --i) {
        RuleRange ruleRange = result.ranges.authorRuleRange();
        collectMatchingRules(state, MatchRequest(matchedRules.at(i-1), includeEmptyRules, state.element()), ruleRange);
    }
    sortAndTransferMatchedRules(state, result);
#else
    UNUSED_PARAM(state);
    UNUSED_PARAM(result);
    UNUSED_PARAM(includeEmptyRules);
#endif
}

void StyleResolver::matchAuthorRules(State& state, MatchResult& result, bool includeEmptyRules)
{
    state.matchedRules().clear();
    result.ranges.lastAuthorRule = result.matchedProperties.size() - 1;

    if (!state.element())
        return;

    // Match global author rules.
    MatchRequest matchRequest(m_ruleSets.authorStyle(), includeEmptyRules);
    RuleRange ruleRange = result.ranges.authorRuleRange();
    collectMatchingRules(state, matchRequest, ruleRange);
    collectMatchingRulesForRegion(state, matchRequest, ruleRange);
#if ENABLE(SHADOW_DOM)
    Vector<MatchRequest> matchRequests;
    m_ruleSets.shadowDistributedRules().collectMatchRequests(includeEmptyRules, matchRequests);
    for (size_t i = 0; i < matchRequests.size(); ++i)
        collectMatchingRules(state, matchRequests[i], ruleRange);
#endif

    sortAndTransferMatchedRules(state, result);

    matchScopedAuthorRules(state, result, includeEmptyRules);
}

void StyleResolver::matchUserRules(State& state, MatchResult& result, bool includeEmptyRules)
{
    if (!m_ruleSets.userStyle())
        return;
    
    state.matchedRules().clear();

    result.ranges.lastUserRule = result.matchedProperties.size() - 1;
    MatchRequest matchRequest(m_ruleSets.userStyle(), includeEmptyRules);
    RuleRange ruleRange = result.ranges.userRuleRange();
    collectMatchingRules(state, matchRequest, ruleRange);
    collectMatchingRulesForRegion(state, matchRequest, ruleRange);

    sortAndTransferMatchedRules(state, result);
}

void StyleResolver::matchUARules(State& state, MatchResult& result, RuleSet* rules)
{
    state.matchedRules().clear();
    
    result.ranges.lastUARule = result.matchedProperties.size() - 1;
    RuleRange ruleRange = result.ranges.UARuleRange();
    collectMatchingRules(state, MatchRequest(rules), ruleRange);

    sortAndTransferMatchedRules(state, result);
}

void StyleResolver::collectMatchingRulesForList(State& state, const Vector<RuleData>* rules, const MatchRequest& matchRequest, RuleRange& ruleRange)
{
    if (!rules)
        return;

    // In some cases we may end up looking up style for random elements in the middle of a recursive tree resolve.
    // Ancestor identifier filter won't be up-to-date in that case and we can't use the fast path.
    bool canUseFastReject = m_selectorFilter.parentStackIsConsistent(state.parentNode()) && matchRequest.behaviorAtBoundary == SelectorChecker::DoesNotCrossBoundary;

    unsigned size = rules->size();
    for (unsigned i = 0; i < size; ++i) {
        const RuleData& ruleData = rules->at(i);
        if (canUseFastReject && m_selectorFilter.fastRejectSelector<RuleData::maximumIdentifierCount>(ruleData.descendantSelectorIdentifierHashes()))
            continue;

        StyleRule* rule = ruleData.rule();
        InspectorInstrumentationCookie cookie = InspectorInstrumentation::willMatchRule(document(), rule, this);
        PseudoId dynamicPseudo = NOPSEUDO;
        if (ruleMatches(state, ruleData, matchRequest.scope, dynamicPseudo, matchRequest.behaviorAtBoundary)) {
            // If the rule has no properties to apply, then ignore it in the non-debug mode.
            const StylePropertySet* properties = rule->properties();
            if (!properties || (properties->isEmpty() && !matchRequest.includeEmptyRules)) {
                InspectorInstrumentation::didMatchRule(cookie, false);
                continue;
            }
            // FIXME: Exposing the non-standard getMatchedCSSRules API to web is the only reason this is needed.
            if (state.isSameOriginOnly() && !ruleData.hasDocumentSecurityOrigin()) {
                InspectorInstrumentation::didMatchRule(cookie, false);
                continue;
            }
            // If we're matching normal rules, set a pseudo bit if
            // we really just matched a pseudo-element.
            if (dynamicPseudo != NOPSEUDO && state.pseudoStyle() == NOPSEUDO) {
                if (state.mode() == SelectorChecker::CollectingRules) {
                    InspectorInstrumentation::didMatchRule(cookie, false);
                    continue;
                }
                if (dynamicPseudo < FIRST_INTERNAL_PSEUDOID)
                    state.style()->setHasPseudoStyle(dynamicPseudo);
            } else {
                // Update our first/last rule indices in the matched rules array.
                ++ruleRange.lastRuleIndex;
                if (ruleRange.firstRuleIndex == -1)
                    ruleRange.firstRuleIndex = ruleRange.lastRuleIndex;

                // Add this rule to our list of matched rules.
                state.addMatchedRule(&ruleData);
                InspectorInstrumentation::didMatchRule(cookie, true);
                continue;
            }
        }
        InspectorInstrumentation::didMatchRule(cookie, false);
    }
}

static inline bool compareRules(const RuleData* r1, const RuleData* r2)
{
    unsigned specificity1 = r1->specificity();
    unsigned specificity2 = r2->specificity();
    return (specificity1 == specificity2) ? r1->position() < r2->position() : specificity1 < specificity2;
}

void StyleResolver::sortMatchedRules(State& state)
{
    std::sort(state.matchedRules().begin(), state.matchedRules().end(), compareRules);
}

void StyleResolver::matchAllRules(State& state, MatchResult& result, bool includeSMILProperties)
{
    matchUARules(state, result);

    // Now we check user sheet rules.
    if (m_matchAuthorAndUserStyles)
        matchUserRules(state, result, false);

    // Now check author rules, beginning first with presentational attributes mapped from HTML.
    if (state.styledElement()) {
        addElementStyleProperties(result, state.styledElement()->presentationAttributeStyle());

        // Now we check additional mapped declarations.
        // Tables and table cells share an additional mapped rule that must be applied
        // after all attributes, since their mapped style depends on the values of multiple attributes.
        addElementStyleProperties(result, state.styledElement()->additionalPresentationAttributeStyle());

        if (state.styledElement()->isHTMLElement()) {
            bool isAuto;
            TextDirection textDirection = toHTMLElement(state.styledElement())->directionalityIfhasDirAutoAttribute(isAuto);
            if (isAuto)
                addMatchedProperties(result, textDirection == LTR ? leftToRightDeclaration() : rightToLeftDeclaration());
        }
    }
    
    // Check the rules in author sheets next.
    if (m_matchAuthorAndUserStyles)
        matchAuthorRules(state, result, false);

    // Now check our inline style attribute.
    if (m_matchAuthorAndUserStyles && state.styledElement() && state.styledElement()->inlineStyle()) {
        // Inline style is immutable as long as there is no CSSOM wrapper.
        // FIXME: Media control shadow trees seem to have problems with caching.
        bool isInlineStyleCacheable = !state.styledElement()->inlineStyle()->isMutable() && !state.styledElement()->isInShadowTree();
        // FIXME: Constify.
        addElementStyleProperties(result, state.styledElement()->inlineStyle(), isInlineStyleCacheable);
    }

#if ENABLE(SVG)
    // Now check SMIL animation override style.
    if (includeSMILProperties && m_matchAuthorAndUserStyles && state.styledElement() && state.styledElement()->isSVGElement())
        addElementStyleProperties(result, static_cast<SVGElement*>(state.styledElement())->animatedSMILStyleProperties(), false /* isCacheable */);
#else
    UNUSED_PARAM(includeSMILProperties);
#endif
}

bool StyleResolver::classNamesAffectedByRules(const SpaceSplitString& classNames) const
{
    for (unsigned i = 0; i < classNames.size(); ++i) {
        if (m_ruleSets.features().classesInRules.contains(classNames[i].impl()))
            return true;
    }
    return false;
}

inline void StyleResolver::State::initElement(Element* e)
{
    m_element = e;
    m_styledElement = e && e->isStyledElement() ? static_cast<StyledElement*>(e) : 0;
    m_elementLinkState = e ? e->document()->visitedLinkState()->determineLinkState(e) : NotInsideLink;
}

inline void StyleResolver::initElement(State& state, Element* e)
{
    state.initElement(e);
    if (e && e == e->document()->documentElement()) {
        e->document()->setDirectionSetOnDocumentElement(false);
        e->document()->setWritingModeSetOnDocumentElement(false);
    }
}

inline void StyleResolver::State::initForStyleResolve(Document* document, Element* e, RenderStyle* parentStyle, PseudoId pseudoId, RenderRegion* regionForStyling)
{
    m_pseudoStyle = pseudoId;
    m_regionForStyling = regionForStyling;

    if (e) {
        NodeRenderingContext context(e);
        m_parentNode = context.parentNodeForRenderingAndStyle();
        m_parentStyle = context.resetStyleInheritance() ? 0 :
            parentStyle ? parentStyle :
            m_parentNode ? m_parentNode->renderStyle() : 0;
        m_distributedToInsertionPoint = context.insertionPoint();
    } else {
        m_parentNode = 0;
        m_parentStyle = parentStyle;
        m_distributedToInsertionPoint = false;
    }

    Node* docElement = e ? e->document()->documentElement() : 0;
    RenderStyle* docStyle = document->renderStyle();
    m_rootElementStyle = docElement && e != docElement ? docElement->renderStyle() : docStyle;

    m_style = 0;
    m_pendingImageProperties.clear();
    m_ruleList = 0;
    m_fontDirty = false;
}

static const unsigned cStyleSearchThreshold = 10;
static const unsigned cStyleSearchLevelThreshold = 10;

static inline bool parentElementPreventsSharing(const Element* parentElement)
{
    if (!parentElement)
        return false;
    return parentElement->hasFlagsSetDuringStylingOfChildren();
}

Node* StyleResolver::locateCousinList(Element* parent, unsigned& visitedNodeCount) const
{
    if (visitedNodeCount >= cStyleSearchThreshold * cStyleSearchLevelThreshold)
        return 0;
    if (!parent || !parent->isStyledElement())
        return 0;
    if (parent->hasScopedHTMLStyleChild())
        return 0;
    StyledElement* p = static_cast<StyledElement*>(parent);
    if (p->inlineStyle())
        return 0;
#if ENABLE(SVG)
    if (p->isSVGElement() && static_cast<SVGElement*>(p)->animatedSMILStyleProperties())
        return 0;
#endif
    if (p->hasID() && m_ruleSets.features().idsInRules.contains(p->idForStyleResolution().impl()))
        return 0;

    RenderStyle* parentStyle = p->renderStyle();
    unsigned subcount = 0;
    Node* thisCousin = p;
    Node* currentNode = p->previousSibling();

    // Reserve the tries for this level. This effectively makes sure that the algorithm
    // will never go deeper than cStyleSearchLevelThreshold levels into recursion.
    visitedNodeCount += cStyleSearchThreshold;
    while (thisCousin) {
        while (currentNode) {
            ++subcount;
            if (currentNode->renderStyle() == parentStyle && currentNode->lastChild()
                && currentNode->isElementNode() && !parentElementPreventsSharing(toElement(currentNode))) {
                // Adjust for unused reserved tries.
                visitedNodeCount -= cStyleSearchThreshold - subcount;
                return currentNode->lastChild();
            }
            if (subcount >= cStyleSearchThreshold)
                return 0;
            currentNode = currentNode->previousSibling();
        }
        currentNode = locateCousinList(thisCousin->parentElement(), visitedNodeCount);
        thisCousin = currentNode;
    }

    return 0;
}

bool StyleResolver::styleSharingCandidateMatchesRuleSet(Element* e, RuleSet* ruleSet)
{
    if (!ruleSet)
        return false;

    State state(document());
    state.initElement(e);
    state.setMode(SelectorChecker::SharingRules);
    int firstRuleIndex = -1, lastRuleIndex = -1;
    RuleRange ruleRange(firstRuleIndex, lastRuleIndex);
    collectMatchingRules(state, MatchRequest(ruleSet), ruleRange);
    return !state.matchedRules().isEmpty();
}

bool StyleResolver::canShareStyleWithControl(const State& state, StyledElement* element) const
{
    HTMLInputElement* thisInputElement = element->toInputElement();
    HTMLInputElement* otherInputElement = state.element()->toInputElement();

    if (!thisInputElement || !otherInputElement)
        return false;

    if (thisInputElement->elementData() != otherInputElement->elementData()) {
        if (thisInputElement->fastGetAttribute(typeAttr) != otherInputElement->fastGetAttribute(typeAttr))
            return false;
        if (thisInputElement->fastGetAttribute(readonlyAttr) != otherInputElement->fastGetAttribute(readonlyAttr))
            return false;
    }

    if (thisInputElement->isAutofilled() != otherInputElement->isAutofilled())
        return false;
    if (thisInputElement->shouldAppearChecked() != otherInputElement->shouldAppearChecked())
        return false;
    if (thisInputElement->isIndeterminate() != otherInputElement->isIndeterminate())
        return false;
    if (thisInputElement->isRequired() != otherInputElement->isRequired())
        return false;

    if (element->isEnabledFormControl() != state.element()->isEnabledFormControl())
        return false;

    if (element->isDefaultButtonForForm() != state.element()->isDefaultButtonForForm())
        return false;

    if (state.document()->containsValidityStyleRules()) {
        bool willValidate = element->willValidate();

        if (willValidate != state.element()->willValidate())
            return false;

        if (willValidate && (element->isValidFormControlElement() != state.element()->isValidFormControlElement()))
            return false;

        if (element->isInRange() != state.element()->isInRange())
            return false;

        if (element->isOutOfRange() != state.element()->isOutOfRange())
            return false;
    }

    return true;
}

static inline bool elementHasDirectionAuto(Element* element)
{
    // FIXME: This line is surprisingly hot, we may wish to inline hasDirectionAuto into StyleResolver.
    return element->isHTMLElement() && toHTMLElement(element)->hasDirectionAuto();
}

bool StyleResolver::sharingCandidateHasIdenticalStyleAffectingAttributes(const State& state, StyledElement* sharingCandidate) const
{
    if (state.element()->elementData() == sharingCandidate->elementData())
        return true;
    if (state.element()->fastGetAttribute(XMLNames::langAttr) != sharingCandidate->fastGetAttribute(XMLNames::langAttr))
        return false;
    if (state.element()->fastGetAttribute(langAttr) != sharingCandidate->fastGetAttribute(langAttr))
        return false;

    if (!state.elementAffectedByClassRules()) {
        if (sharingCandidate->hasClass() && classNamesAffectedByRules(sharingCandidate->classNames()))
            return false;
    } else if (sharingCandidate->hasClass()) {
#if ENABLE(SVG)
        // SVG elements require a (slow!) getAttribute comparision because "class" is an animatable attribute for SVG.
        if (state.element()->isSVGElement()) {
            if (state.element()->getAttribute(classAttr) != sharingCandidate->getAttribute(classAttr))
                return false;
        } else {
#endif
            if (state.element()->classNames() != sharingCandidate->classNames())
                return false;
#if ENABLE(SVG)
        }
#endif
    } else
        return false;

    if (state.styledElement()->presentationAttributeStyle() != sharingCandidate->presentationAttributeStyle())
        return false;

#if ENABLE(PROGRESS_ELEMENT)
    if (state.element()->hasTagName(progressTag)) {
        if (static_cast<HTMLProgressElement*>(state.element())->isDeterminate() != static_cast<HTMLProgressElement*>(sharingCandidate)->isDeterminate())
            return false;
    }
#endif

    return true;
}

bool StyleResolver::canShareStyleWithElement(const State& state, StyledElement* element) const
{
    RenderStyle* style = element->renderStyle();

    if (!style)
        return false;
    if (style->unique())
        return false;
    if (style->hasUniquePseudoStyle())
        return false;
    if (element->tagQName() != state.element()->tagQName())
        return false;
    if (element->inlineStyle())
        return false;
    if (element->needsStyleRecalc())
        return false;
#if ENABLE(SVG)
    if (element->isSVGElement() && static_cast<SVGElement*>(element)->animatedSMILStyleProperties())
        return false;
#endif
    if (element->isLink() != state.element()->isLink())
        return false;
    if (element->hovered() != state.element()->hovered())
        return false;
    if (element->active() != state.element()->active())
        return false;
    if (element->focused() != state.element()->focused())
        return false;
    if (element->shadowPseudoId() != state.element()->shadowPseudoId())
        return false;
    if (element == element->document()->cssTarget())
        return false;
    if (!sharingCandidateHasIdenticalStyleAffectingAttributes(state, element))
        return false;
    if (element->additionalPresentationAttributeStyle() != state.styledElement()->additionalPresentationAttributeStyle())
        return false;

    if (element->hasID() && m_ruleSets.features().idsInRules.contains(element->idForStyleResolution().impl()))
        return false;
    if (element->hasScopedHTMLStyleChild())
        return false;

    // FIXME: We should share style for option and optgroup whenever possible.
    // Before doing so, we need to resolve issues in HTMLSelectElement::recalcListItems
    // and RenderMenuList::setText. See also https://bugs.webkit.org/show_bug.cgi?id=88405
    if (element->hasTagName(optionTag) || element->hasTagName(optgroupTag))
        return false;

    bool isControl = element->isFormControlElement();

    if (isControl != state.element()->isFormControlElement())
        return false;

    if (isControl && !canShareStyleWithControl(state, element))
        return false;

    if (style->transitions() || style->animations())
        return false;

#if USE(ACCELERATED_COMPOSITING)
    // Turn off style sharing for elements that can gain layers for reasons outside of the style system.
    // See comments in RenderObject::setStyle().
    if (element->hasTagName(iframeTag) || element->hasTagName(frameTag) || element->hasTagName(embedTag) || element->hasTagName(objectTag) || element->hasTagName(appletTag) || element->hasTagName(canvasTag)
#if ENABLE(PLUGIN_PROXY_FOR_VIDEO)
        // With proxying, the media elements are backed by a RenderEmbeddedObject.
        || element->hasTagName(videoTag) || element->hasTagName(audioTag)
#endif
        )
        return false;
#endif

    if (elementHasDirectionAuto(element))
        return false;

    if (element->isLink() && state.elementLinkState() != style->insideLink())
        return false;

#if ENABLE(VIDEO_TRACK)
    // Deny sharing styles between WebVTT and non-WebVTT nodes.
    if (element->isWebVTTElement() != state.element()->isWebVTTElement())
        return false;

    if (element->isWebVTTElement() && state.element()->isWebVTTElement() && toWebVTTElement(element)->isPastNode() != toWebVTTElement(state.element())->isPastNode())
        return false;
#endif

#if ENABLE(FULLSCREEN_API)
    if (element == element->document()->webkitCurrentFullScreenElement() || state.element() == state.document()->webkitCurrentFullScreenElement())
        return false;
#endif
    return true;
}

inline StyledElement* StyleResolver::findSiblingForStyleSharing(const State& state, Node* node, unsigned& count) const
{
    for (; node; node = node->previousSibling()) {
        if (!node->isStyledElement())
            continue;
        if (canShareStyleWithElement(state, static_cast<StyledElement*>(node)))
            break;
        if (count++ == cStyleSearchThreshold)
            return 0;
    }
    return static_cast<StyledElement*>(node);
}

RenderStyle* StyleResolver::locateSharedStyle(State& state)
{
    if (!state.styledElement() || !state.parentStyle())
        return 0;

    // If the element has inline style it is probably unique.
    if (state.styledElement()->inlineStyle())
        return 0;
#if ENABLE(SVG)
    if (state.styledElement()->isSVGElement() && static_cast<SVGElement*>(state.styledElement())->animatedSMILStyleProperties())
        return 0;
#endif
    // Ids stop style sharing if they show up in the stylesheets.
    if (state.styledElement()->hasID() && m_ruleSets.features().idsInRules.contains(state.styledElement()->idForStyleResolution().impl()))
        return 0;
    if (parentElementPreventsSharing(state.element()->parentElement()))
        return 0;
    if (state.styledElement()->hasScopedHTMLStyleChild())
        return 0;
    if (state.element() == state.document()->cssTarget())
        return 0;
    if (elementHasDirectionAuto(state.element()))
        return 0;

    // Cache whether state.element is affected by any known class selectors.
    // FIXME: This shouldn't be a member variable. The style sharing code could be factored out of StyleResolver.
    state.setElementAffectedByClassRules(state.element() && state.element()->hasClass() && classNamesAffectedByRules(state.element()->classNames()));

    // Check previous siblings and their cousins.
    unsigned count = 0;
    unsigned visitedNodeCount = 0;
    StyledElement* shareElement = 0;
    Node* cousinList = state.styledElement()->previousSibling();
    while (cousinList) {
        shareElement = findSiblingForStyleSharing(state, cousinList, count);
        if (shareElement)
            break;
        cousinList = locateCousinList(cousinList->parentElement(), visitedNodeCount);
    }

    // If we have exhausted all our budget or our cousins.
    if (!shareElement)
        return 0;

    // Can't share if sibling rules apply. This is checked at the end as it should rarely fail.
    if (styleSharingCandidateMatchesRuleSet(state.element(), m_ruleSets.sibling()))
        return 0;
    // Can't share if attribute rules apply.
    if (styleSharingCandidateMatchesRuleSet(state.element(), m_ruleSets.uncommonAttribute()))
        return 0;
    // Can't share if @host @-rules apply.
    if (styleSharingCandidateMatchesHostRules(state))
        return 0;
    // Tracking child index requires unique style for each node. This may get set by the sibling rule match above.
    if (parentElementPreventsSharing(state.element()->parentElement()))
        return 0;
    return shareElement->renderStyle();
}

void StyleResolver::matchUARules(State& state, MatchResult& result)
{
    MatchingUARulesScope scope;

    // First we match rules from the user agent sheet.
    if (CSSDefaultStyleSheets::simpleDefaultStyleSheet)
        result.isCacheable = false;
    RuleSet* userAgentStyleSheet = m_medium->mediaTypeMatchSpecific("print")
        ? CSSDefaultStyleSheets::defaultPrintStyle : CSSDefaultStyleSheets::defaultStyle;
    matchUARules(state, result, userAgentStyleSheet);

    // In quirks mode, we match rules from the quirks user agent sheet.
    if (document()->inQuirksMode())
        matchUARules(state, result, CSSDefaultStyleSheets::defaultQuirksStyle);

    // If document uses view source styles (in view source mode or in xml viewer mode), then we match rules from the view source style sheet.
    if (document()->isViewSource())
        matchUARules(state, result, CSSDefaultStyleSheets::viewSourceStyle());
}

static void setStylesForPaginationMode(Pagination::Mode paginationMode, RenderStyle* style)
{
    if (paginationMode == Pagination::Unpaginated)
        return;
        
    switch (paginationMode) {
    case Pagination::LeftToRightPaginated:
        style->setColumnAxis(HorizontalColumnAxis);
        if (style->isHorizontalWritingMode())
            style->setColumnProgression(style->isLeftToRightDirection() ? NormalColumnProgression : ReverseColumnProgression);
        else
            style->setColumnProgression(style->isFlippedBlocksWritingMode() ? ReverseColumnProgression : NormalColumnProgression);
        break;
    case Pagination::RightToLeftPaginated:
        style->setColumnAxis(HorizontalColumnAxis);
        if (style->isHorizontalWritingMode())
            style->setColumnProgression(style->isLeftToRightDirection() ? ReverseColumnProgression : NormalColumnProgression);
        else
            style->setColumnProgression(style->isFlippedBlocksWritingMode() ? NormalColumnProgression : ReverseColumnProgression);
        break;
    case Pagination::TopToBottomPaginated:
        style->setColumnAxis(VerticalColumnAxis);
        if (style->isHorizontalWritingMode())
            style->setColumnProgression(style->isFlippedBlocksWritingMode() ? ReverseColumnProgression : NormalColumnProgression);
        else
            style->setColumnProgression(style->isLeftToRightDirection() ? NormalColumnProgression : ReverseColumnProgression);
        break;
    case Pagination::BottomToTopPaginated:
        style->setColumnAxis(VerticalColumnAxis);
        if (style->isHorizontalWritingMode())
            style->setColumnProgression(style->isFlippedBlocksWritingMode() ? NormalColumnProgression : ReverseColumnProgression);
        else
            style->setColumnProgression(style->isLeftToRightDirection() ? ReverseColumnProgression : NormalColumnProgression);
        break;
    case Pagination::Unpaginated:
        ASSERT_NOT_REACHED();
        break;
    }
}

static void getFontAndGlyphOrientation(const RenderStyle* style, FontOrientation& fontOrientation, NonCJKGlyphOrientation& glyphOrientation)
{
    if (style->isHorizontalWritingMode()) {
        fontOrientation = Horizontal;
        glyphOrientation = NonCJKGlyphOrientationVerticalRight;
        return;
    }

    switch (style->textOrientation()) {
    case TextOrientationVerticalRight:
        fontOrientation = Vertical;
        glyphOrientation = NonCJKGlyphOrientationVerticalRight;
        return;
    case TextOrientationUpright:
        fontOrientation = Vertical;
        glyphOrientation = NonCJKGlyphOrientationUpright;
        return;
    case TextOrientationSideways:
        if (style->writingMode() == LeftToRightWritingMode) {
            // FIXME: This should map to sideways-left, which is not supported yet.
            fontOrientation = Vertical;
            glyphOrientation = NonCJKGlyphOrientationVerticalRight;
            return;
        }
        fontOrientation = Horizontal;
        glyphOrientation = NonCJKGlyphOrientationVerticalRight;
        return;
    case TextOrientationSidewaysRight:
        fontOrientation = Horizontal;
        glyphOrientation = NonCJKGlyphOrientationVerticalRight;
        return;
    default:
        ASSERT_NOT_REACHED();
        fontOrientation = Horizontal;
        glyphOrientation = NonCJKGlyphOrientationVerticalRight;
        return;
    }
}

PassRefPtr<RenderStyle> StyleResolver::styleForDocument(Document* document, CSSFontSelector* fontSelector)
{
    Frame* frame = document->frame();

    // HTML5 states that seamless iframes should replace default CSS values
    // with values inherited from the containing iframe element. However,
    // some values (such as the case of designMode = "on") still need to
    // be set by this "document style".
    RefPtr<RenderStyle> documentStyle = RenderStyle::create();
    bool seamlessWithParent = document->shouldDisplaySeamlesslyWithParent();
    if (seamlessWithParent) {
        RenderStyle* iframeStyle = document->seamlessParentIFrame()->renderStyle();
        if (iframeStyle)
            documentStyle->inheritFrom(iframeStyle);
    }

    // FIXME: It's not clear which values below we want to override in the seamless case!
    documentStyle->setDisplay(BLOCK);
    if (!seamlessWithParent) {
        documentStyle->setRTLOrdering(document->visuallyOrdered() ? VisualOrder : LogicalOrder);
        documentStyle->setZoom(frame && !document->printing() ? frame->pageZoomFactor() : 1);
        documentStyle->setPageScaleTransform(frame ? frame->frameScaleFactor() : 1);
        documentStyle->setLocale(document->contentLanguage());
    }
    // This overrides any -webkit-user-modify inherited from the parent iframe.
    documentStyle->setUserModify(document->inDesignMode() ? READ_WRITE : READ_ONLY);

    Element* docElement = document->documentElement();
    RenderObject* docElementRenderer = docElement ? docElement->renderer() : 0;
    if (docElementRenderer) {
        // Use the direction and writing-mode of the body to set the
        // viewport's direction and writing-mode unless the property is set on the document element.
        // If there is no body, then use the document element.
        RenderObject* bodyRenderer = document->body() ? document->body()->renderer() : 0;
        if (bodyRenderer && !document->writingModeSetOnDocumentElement())
            documentStyle->setWritingMode(bodyRenderer->style()->writingMode());
        else
            documentStyle->setWritingMode(docElementRenderer->style()->writingMode());
        if (bodyRenderer && !document->directionSetOnDocumentElement())
            documentStyle->setDirection(bodyRenderer->style()->direction());
        else
            documentStyle->setDirection(docElementRenderer->style()->direction());
    }

    if (frame) {
        if (FrameView* frameView = frame->view()) {
            const Pagination& pagination = frameView->pagination();
            if (pagination.mode != Pagination::Unpaginated) {
                setStylesForPaginationMode(pagination.mode, documentStyle.get());
                documentStyle->setColumnGap(pagination.gap);
                if (RenderView* view = document->renderView()) {
                    if (view->hasColumns())
                        view->updateColumnInfoFromStyle(documentStyle.get());
                }
            }
        }
    }

    // Seamless iframes want to inherit their font from their parent iframe, so early return before setting the font.
    if (seamlessWithParent)
        return documentStyle.release();

    FontDescription fontDescription;
    fontDescription.setScript(localeToScriptCodeForFontSelection(documentStyle->locale()));
    if (Settings* settings = document->settings()) {
        fontDescription.setUsePrinterFont(document->printing() || !settings->screenFontSubstitutionEnabled());
        fontDescription.setRenderingMode(settings->fontRenderingMode());
        const AtomicString& standardFont = settings->standardFontFamily(fontDescription.script());
        if (!standardFont.isEmpty()) {
            fontDescription.setGenericFamily(FontDescription::StandardFamily);
            fontDescription.firstFamily().setFamily(standardFont);
            fontDescription.firstFamily().appendFamily(0);
        }
        fontDescription.setKeywordSize(CSSValueMedium - CSSValueXxSmall + 1);
        int size = StyleResolver::fontSizeForKeyword(document, CSSValueMedium, false);
        fontDescription.setSpecifiedSize(size);
        bool useSVGZoomRules = document->isSVGDocument();
        fontDescription.setComputedSize(StyleResolver::getComputedSizeFromSpecifiedSize(document, documentStyle.get(), fontDescription.isAbsoluteSize(), size, useSVGZoomRules));
    } else
        fontDescription.setUsePrinterFont(document->printing());

    FontOrientation fontOrientation;
    NonCJKGlyphOrientation glyphOrientation;
    getFontAndGlyphOrientation(documentStyle.get(), fontOrientation, glyphOrientation);
    fontDescription.setOrientation(fontOrientation);
    fontDescription.setNonCJKGlyphOrientation(glyphOrientation);

    documentStyle->setFontDescription(fontDescription);
    documentStyle->font().update(fontSelector);

    return documentStyle.release();
}

static inline bool isAtShadowBoundary(const Element* element)
{
    if (!element)
        return false;
    ContainerNode* parentNode = element->parentNode();
    return parentNode && parentNode->isShadowRoot();
}

PassRefPtr<RenderStyle> StyleResolver::styleForElement(Element* element, RenderStyle* defaultParent,
    StyleSharingBehavior sharingBehavior, RuleMatchingBehavior matchingBehavior, RenderRegion* regionForStyling)
{
    // Once an element has a renderer, we don't try to destroy it, since otherwise the renderer
    // will vanish if a style recalc happens during loading.
    if (sharingBehavior == AllowStyleSharing && !element->document()->haveStylesheetsLoaded() && !element->renderer()) {
        if (!s_styleNotYetAvailable) {
            s_styleNotYetAvailable = RenderStyle::create().leakRef();
            s_styleNotYetAvailable->setDisplay(NONE);
            s_styleNotYetAvailable->font().update(m_fontSelector);
        }
        element->document()->setHasNodesWithPlaceholderStyle();
        return s_styleNotYetAvailable;
    }

    State state(document());
    initElement(state, element);
    state.initForStyleResolve(document(), element, defaultParent, NOPSEUDO, regionForStyling);
    if (sharingBehavior == AllowStyleSharing && !state.distributedToInsertionPoint()) {
        RenderStyle* sharedStyle = locateSharedStyle(state);
        if (sharedStyle)
            return sharedStyle;
    }

    RefPtr<RenderStyle> cloneForParent;
    RefPtr<RenderStyle> style;

    if (state.parentStyle()) {
        style = RenderStyle::create();
        style->inheritFrom(state.parentStyle(), isAtShadowBoundary(element) ? RenderStyle::AtShadowBoundary : RenderStyle::NotAtShadowBoundary);
    } else {
        style = defaultStyleForElement();
        cloneForParent = RenderStyle::clone(style.get());
        state.setParentStyle(cloneForParent.get());
    }
    state.setStyle(style);

    // contenteditable attribute (implemented by -webkit-user-modify) should
    // be propagated from shadow host to distributed node.
    if (state.distributedToInsertionPoint()) {
        if (Element* parent = element->parentElement()) {
            if (RenderStyle* styleOfShadowHost = parent->renderStyle())
                state.style()->setUserModify(styleOfShadowHost->userModify());
        }
    }

    if (element->isLink()) {
        state.style()->setIsLink(true);
        EInsideLink linkState = state.elementLinkState();
        if (linkState != NotInsideLink) {
            bool forceVisited = InspectorInstrumentation::forcePseudoState(element, CSSSelector::PseudoVisited);
            if (forceVisited)
                linkState = InsideVisitedLink;
        }
        state.style()->setInsideLink(linkState);
    }

    bool needsCollection = false;
    CSSDefaultStyleSheets::ensureDefaultStyleSheetsForElement(element, needsCollection);
    if (needsCollection)
        m_ruleSets.collectFeatures(document()->isViewSource(), m_scopeResolver.get());

    MatchResult matchResult;
    if (matchingBehavior == MatchOnlyUserAgentRules)
        matchUARules(state, matchResult);
    else
        matchAllRules(state, matchResult, matchingBehavior != MatchAllRulesExcludingSMIL);

    applyMatchedProperties(state, matchResult, element);

    // Clean up our style object's display and text decorations (among other fixups).
    adjustRenderStyle(state, style.get(), state.parentStyle(), element);

    document()->didAccessStyleResolver();

    // Now return the style.
    return state.takeStyle();
}

PassRefPtr<RenderStyle> StyleResolver::styleForKeyframe(State& state, const RenderStyle* elementStyle, const StyleKeyframe* keyframe, KeyframeValue& keyframeValue)
{
    MatchResult result;
    if (keyframe->properties())
        addMatchedProperties(result, keyframe->properties());

    // Create the style
    RefPtr<RenderStyle> style = RenderStyle::clone(elementStyle);
    state.setStyle(style);
    state.setLineHeightValue(0);

    // We don't need to bother with !important. Since there is only ever one
    // decl, there's nothing to override. So just add the first properties.
    bool inheritedOnly = false;
    if (keyframe->properties())
        applyMatchedProperties<HighPriorityProperties>(state, result, false, 0, result.matchedProperties.size() - 1, inheritedOnly);

    // If our font got dirtied, go ahead and update it now.
    updateFont(state);

    // Line-height is set when we are sure we decided on the font-size
    if (state.lineHeightValue())
        applyProperty(state, CSSPropertyLineHeight, state.lineHeightValue());

    // Now do rest of the properties.
    if (keyframe->properties())
        applyMatchedProperties<LowPriorityProperties>(state, result, false, 0, result.matchedProperties.size() - 1, inheritedOnly);

    // If our font got dirtied by one of the non-essential font props,
    // go ahead and update it a second time.
    updateFont(state);

    // Start loading resources referenced by this style.
    loadPendingResources(state);
    
    // Add all the animating properties to the keyframe.
    if (const StylePropertySet* styleDeclaration = keyframe->properties()) {
        unsigned propertyCount = styleDeclaration->propertyCount();
        for (unsigned i = 0; i < propertyCount; ++i) {
            CSSPropertyID property = styleDeclaration->propertyAt(i).id();
            // Timing-function within keyframes is special, because it is not animated; it just
            // describes the timing function between this keyframe and the next.
            if (property != CSSPropertyWebkitAnimationTimingFunction)
                keyframeValue.addProperty(property);
        }
    }

    document()->didAccessStyleResolver();

    return state.takeStyle();
}

void StyleResolver::keyframeStylesForAnimation(Element* e, const RenderStyle* elementStyle, KeyframeList& list)
{
    list.clear();

    // Get the keyframesRule for this name
    if (!e || list.animationName().isEmpty())
        return;

    m_keyframesRuleMap.checkConsistency();

    KeyframesRuleMap::iterator it = m_keyframesRuleMap.find(list.animationName().impl());
    if (it == m_keyframesRuleMap.end())
        return;

    const StyleRuleKeyframes* keyframesRule = it->value.get();

    // Construct and populate the style for each keyframe
    const Vector<RefPtr<StyleKeyframe> >& keyframes = keyframesRule->keyframes();
    State state(document());
    initElement(state, e);
    state.initForStyleResolve(document(), e);
    for (unsigned i = 0; i < keyframes.size(); ++i) {
        // Apply the declaration to the style. This is a simplified version of the logic in styleForElement
        const StyleKeyframe* keyframe = keyframes[i].get();

        KeyframeValue keyframeValue(0, 0);
        keyframeValue.setStyle(styleForKeyframe(state, elementStyle, keyframe, keyframeValue));

        // Add this keyframe style to all the indicated key times
        Vector<float> keys;
        keyframe->getKeys(keys);
        for (size_t keyIndex = 0; keyIndex < keys.size(); ++keyIndex) {
            keyframeValue.setKey(keys[keyIndex]);
            list.insert(keyframeValue);
        }
    }

    // If the 0% keyframe is missing, create it (but only if there is at least one other keyframe)
    int initialListSize = list.size();
    if (initialListSize > 0 && list[0].key()) {
        static StyleKeyframe* zeroPercentKeyframe;
        if (!zeroPercentKeyframe) {
            zeroPercentKeyframe = StyleKeyframe::create().leakRef();
            zeroPercentKeyframe->setKeyText("0%");
        }
        KeyframeValue keyframeValue(0, 0);
        keyframeValue.setStyle(styleForKeyframe(state, elementStyle, zeroPercentKeyframe, keyframeValue));
        list.insert(keyframeValue);
    }

    // If the 100% keyframe is missing, create it (but only if there is at least one other keyframe)
    if (initialListSize > 0 && (list[list.size() - 1].key() != 1)) {
        static StyleKeyframe* hundredPercentKeyframe;
        if (!hundredPercentKeyframe) {
            hundredPercentKeyframe = StyleKeyframe::create().leakRef();
            hundredPercentKeyframe->setKeyText("100%");
        }
        KeyframeValue keyframeValue(1, 0);
        keyframeValue.setStyle(styleForKeyframe(state, elementStyle, hundredPercentKeyframe, keyframeValue));
        list.insert(keyframeValue);
    }
}

PassRefPtr<RenderStyle> StyleResolver::pseudoStyleForElement(PseudoId pseudo, Element* e, RenderStyle* parentStyle)
{
    ASSERT(parentStyle);
    if (!e)
        return 0;

    State state(document());
    initElement(state, e);
    state.initForStyleResolve(document(), e, parentStyle, pseudo);
    state.setStyle(RenderStyle::create());
    state.style()->inheritFrom(state.parentStyle());

    // 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.
    MatchResult matchResult;
    matchUARules(state, matchResult);

    if (m_matchAuthorAndUserStyles) {
        matchUserRules(state, matchResult, false);
        matchAuthorRules(state, matchResult, false);
    }

    if (matchResult.matchedProperties.isEmpty())
        return 0;

    state.style()->setStyleType(pseudo);

    applyMatchedProperties(state, matchResult, e);

    // Clean up our style object's display and text decorations (among other fixups).
    adjustRenderStyle(state, state.style(), state.parentStyle(), 0);

    // Start loading resources referenced by this style.
    loadPendingResources(state);

    document()->didAccessStyleResolver();

    // Now return the style.
    return state.takeStyle();
}

PassRefPtr<RenderStyle> StyleResolver::styleForPage(int pageIndex)
{
    State state(document());
    state.initForStyleResolve(document(), document()->documentElement()); // m_rootElementStyle will be set to the document style.

    state.setStyle(RenderStyle::create());
    state.style()->inheritFrom(state.rootElementStyle());

    const bool isLeft = isLeftPage(state, pageIndex);
    const bool isFirst = isFirstPage(pageIndex);
    const String page = pageName(pageIndex);
    
    MatchResult result;
    matchPageRules(result, CSSDefaultStyleSheets::defaultPrintStyle, isLeft, isFirst, page);
    matchPageRules(result, m_ruleSets.userStyle(), isLeft, isFirst, page);
    // Only consider the global author RuleSet for @page rules, as per the HTML5 spec.
    matchPageRules(result, m_ruleSets.authorStyle(), isLeft, isFirst, page);
    state.setLineHeightValue(0);
    bool inheritedOnly = false;
#if ENABLE(CSS_VARIABLES)
    applyMatchedProperties<VariableDefinitions>(state, result, false, 0, result.matchedProperties.size() - 1, inheritedOnly);
#endif
    applyMatchedProperties<HighPriorityProperties>(state, result, false, 0, result.matchedProperties.size() - 1, inheritedOnly);

    // If our font got dirtied, go ahead and update it now.
    updateFont(state);

    // Line-height is set when we are sure we decided on the font-size.
    if (state.lineHeightValue())
        applyProperty(state, CSSPropertyLineHeight, state.lineHeightValue());

    applyMatchedProperties<LowPriorityProperties>(state, result, false, 0, result.matchedProperties.size() - 1, inheritedOnly);

    // Start loading resources referenced by this style.
    loadPendingResources(state);

    document()->didAccessStyleResolver();

    // Now return the style.
    return state.takeStyle();
}

PassRefPtr<RenderStyle> StyleResolver::defaultStyleForElement()
{
    State state(document());
    state.setStyle(RenderStyle::create());
    // Make sure our fonts are initialized if we don't inherit them from our parent style.
    if (Settings* settings = documentSettings()) {
        initializeFontStyle(state, settings);
        state.style()->font().update(fontSelector());
    } else
        state.style()->font().update(0);

    return state.takeStyle();
}

PassRefPtr<RenderStyle> StyleResolver::styleForText(Text* textNode)
{
    ASSERT(textNode);

    NodeRenderingContext context(textNode);
    Node* parentNode = context.parentNodeForRenderingAndStyle();
    return context.resetStyleInheritance() || !parentNode ?
        defaultStyleForElement() : parentNode->renderStyle();
}

static void addIntrinsicMargins(RenderStyle* style)
{
    // Intrinsic margin value.
    const int intrinsicMargin = 2 * style->effectiveZoom();

    // FIXME: Using width/height alone and not also dealing with min-width/max-width is flawed.
    // FIXME: Using "quirk" to decide the margin wasn't set is kind of lame.
    if (style->width().isIntrinsicOrAuto()) {
        if (style->marginLeft().quirk())
            style->setMarginLeft(Length(intrinsicMargin, Fixed));
        if (style->marginRight().quirk())
            style->setMarginRight(Length(intrinsicMargin, Fixed));
    }

    if (style->height().isAuto()) {
        if (style->marginTop().quirk())
            style->setMarginTop(Length(intrinsicMargin, Fixed));
        if (style->marginBottom().quirk())
            style->setMarginBottom(Length(intrinsicMargin, Fixed));
    }
}

static EDisplay equivalentBlockDisplay(EDisplay display, bool isFloating, bool strictParsing)
{
    switch (display) {
    case BLOCK:
    case TABLE:
    case BOX:
    case FLEX:
    case GRID:
        return display;

    case 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 && isFloating)
            return BLOCK;
        return display;
    case INLINE_TABLE:
        return TABLE;
    case INLINE_BOX:
        return BOX;
    case INLINE_FLEX:
        return FLEX;
    case INLINE_GRID:
        return GRID;

    case INLINE:
    case RUN_IN:
    case COMPACT:
    case INLINE_BLOCK:
    case TABLE_ROW_GROUP:
    case TABLE_HEADER_GROUP:
    case TABLE_FOOTER_GROUP:
    case TABLE_ROW:
    case TABLE_COLUMN_GROUP:
    case TABLE_COLUMN:
    case TABLE_CELL:
    case TABLE_CAPTION:
        return BLOCK;
    case NONE:
        ASSERT_NOT_REACHED();
        return NONE;
    }
    ASSERT_NOT_REACHED();
    return BLOCK;
}

// CSS requires text-decoration to be reset at each DOM element for tables, 
// inline blocks, inline tables, run-ins, shadow DOM crossings, floating elements,
// and absolute or relatively positioned elements.
static bool doesNotInheritTextDecoration(RenderStyle* style, Element* e)
{
    return style->display() == TABLE || style->display() == INLINE_TABLE || style->display() == RUN_IN
        || style->display() == INLINE_BLOCK || style->display() == INLINE_BOX || isAtShadowBoundary(e)
        || style->isFloating() || style->hasOutOfFlowPosition();
}

static bool isDisplayFlexibleBox(EDisplay display)
{
    return display == FLEX || display == INLINE_FLEX;
}

void StyleResolver::adjustRenderStyle(State& state, RenderStyle* style, RenderStyle* parentStyle, Element *e)
{
    ASSERT(parentStyle);

    // 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 (document()->inQuirksMode() && e) {
            if (e->hasTagName(tdTag)) {
                style->setDisplay(TABLE_CELL);
                style->setFloating(NoFloat);
            } else if (e->hasTagName(tableTag))
                style->setDisplay(style->isDisplayInlineType() ? INLINE_TABLE : TABLE);
        }

        if (e && (e->hasTagName(tdTag) || e->hasTagName(thTag))) {
            if (style->whiteSpace() == KHTML_NOWRAP) {
                // Figure out if we are really nowrapping or if we should just
                // use normal instead. If the width of the cell is fixed, then
                // we don't actually use NOWRAP.
                if (style->width().isFixed())
                    style->setWhiteSpace(NORMAL);
                else
                    style->setWhiteSpace(NOWRAP);
            }
        }

        // Tables never support the -webkit-* values for text-align and will reset back to the default.
        if (e && e->hasTagName(tableTag) && (style->textAlign() == WEBKIT_LEFT || style->textAlign() == WEBKIT_CENTER || style->textAlign() == WEBKIT_RIGHT))
            style->setTextAlign(TASTART);

        // 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. They also never honor display.
        if (e && (e->hasTagName(frameTag) || e->hasTagName(framesetTag))) {
            style->setPosition(StaticPosition);
            style->setDisplay(BLOCK);
        }

        // Ruby text does not support float or position. This might change with evolution of the specification.
        if (e && e->hasTagName(rtTag)) {
            style->setPosition(StaticPosition);
            style->setFloating(NoFloat);
        }

        // FIXME: We shouldn't be overriding start/-webkit-auto like this. Do it in html.css instead.
        // Table headers with a text-align of -webkit-auto will change the text-align to center.
        if (e && e->hasTagName(thTag) && style->textAlign() == TASTART)
            style->setTextAlign(CENTER);

        if (e && e->hasTagName(legendTag))
            style->setDisplay(BLOCK);

        // Absolute/fixed positioned elements, floating elements and the document element need block-like outside display.
        if (style->hasOutOfFlowPosition() || style->isFloating() || (e && e->document()->documentElement() == e))
            style->setDisplay(equivalentBlockDisplay(style->display(), style->isFloating(), !document()->inQuirksMode()));

        // FIXME: Don't support this mutation for pseudo styles like first-letter or first-line, since it's not completely
        // clear how that should work.
        if (style->display() == INLINE && style->styleType() == NOPSEUDO && style->writingMode() != parentStyle->writingMode())
            style->setDisplay(INLINE_BLOCK);

        // After performing the display mutation, check table rows. We do not honor position:relative or position:sticky on
        // table rows or cells. This has been established for position:relative in CSS2.1 (and caused a crash in containingBlock()
        // on some sites).
        if ((style->display() == TABLE_HEADER_GROUP || style->display() == TABLE_ROW_GROUP
            || style->display() == TABLE_FOOTER_GROUP || style->display() == TABLE_ROW)
            && style->hasInFlowPosition())
            style->setPosition(StaticPosition);

        // writing-mode does not apply to table row groups, table column groups, table rows, and table columns.
        // FIXME: Table cells should be allowed to be perpendicular or flipped with respect to the table, though.
        if (style->display() == TABLE_COLUMN || style->display() == TABLE_COLUMN_GROUP || style->display() == TABLE_FOOTER_GROUP
            || style->display() == TABLE_HEADER_GROUP || style->display() == TABLE_ROW || style->display() == TABLE_ROW_GROUP
            || style->display() == TABLE_CELL)
            style->setWritingMode(parentStyle->writingMode());

        // FIXME: Since we don't support block-flow on flexible boxes yet, disallow setting
        // of block-flow to anything other than TopToBottomWritingMode.
        // https://bugs.webkit.org/show_bug.cgi?id=46418 - Flexible box support.
        if (style->writingMode() != TopToBottomWritingMode && (style->display() == BOX || style->display() == INLINE_BOX))
            style->setWritingMode(TopToBottomWritingMode);

        if (isDisplayFlexibleBox(parentStyle->display())) {
            style->setFloating(NoFloat);
            style->setDisplay(equivalentBlockDisplay(style->display(), style->isFloating(), !document()->inQuirksMode()));
        }

#if ENABLE(DIALOG_ELEMENT)
        // Per the spec, position 'static' and 'relative' in the top layer compute to 'absolute'.
        if (e && e->isInTopLayer() && (style->position() == StaticPosition || style->position() == RelativePosition)) {
            style->setPosition(AbsolutePosition);
            style->setDisplay(BLOCK);
        }
#endif
    }

    // Make sure our z-index value is only applied if the object is positioned.
    if (style->position() == StaticPosition && !isDisplayFlexibleBox(parentStyle->display()))
        style->setHasAutoZIndex();

    // Auto z-index becomes 0 for the root element and 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. Auto z-index also becomes 0 for objects that specify transforms/masks/reflections.
    if (style->hasAutoZIndex() && ((e && e->document()->documentElement() == e)
        || style->opacity() < 1.0f
        || style->hasTransformRelatedProperty()
        || style->hasMask()
        || style->clipPath()
        || style->boxReflect()
        || style->hasFilter()
        || style->hasBlendMode()
        || style->position() == StickyPosition
        || (style->position() == FixedPosition && e && e->document()->page() && e->document()->page()->settings()->fixedPositionCreatesStackingContext())
#if ENABLE(ACCELERATED_OVERFLOW_SCROLLING)
        // Touch overflow scrolling creates a stacking context.
        || ((style->overflowX() != OHIDDEN || style->overflowY() != OHIDDEN) && style->useTouchOverflowScrolling())
#endif
#if ENABLE(DIALOG_ELEMENT)
        || (e && e->isInTopLayer())
#endif
        ))
        style->setZIndex(0);

    // Textarea considers overflow visible as auto.
    if (e && e->hasTagName(textareaTag)) {
        style->setOverflowX(style->overflowX() == OVISIBLE ? OAUTO : style->overflowX());
        style->setOverflowY(style->overflowY() == OVISIBLE ? OAUTO : style->overflowY());
    }

    if (doesNotInheritTextDecoration(style, e))
        style->setTextDecorationsInEffect(style->textDecoration());
    else
        style->addToTextDecorationsInEffect(style->textDecoration());

    // If either overflow value is not visible, change to auto.
    if (style->overflowX() == OMARQUEE && style->overflowY() != OMARQUEE)
        style->setOverflowY(OMARQUEE);
    else if (style->overflowY() == OMARQUEE && style->overflowX() != OMARQUEE)
        style->setOverflowX(OMARQUEE);
    else if (style->overflowX() == OVISIBLE && style->overflowY() != OVISIBLE) {
        // FIXME: Once we implement pagination controls, overflow-x should default to hidden
        // if overflow-y is set to -webkit-paged-x or -webkit-page-y. For now, we'll let it
        // default to auto so we can at least scroll through the pages.
        style->setOverflowX(OAUTO);
    } else if (style->overflowY() == OVISIBLE && style->overflowX() != OVISIBLE)
        style->setOverflowY(OAUTO);

    // Call setStylesForPaginationMode() if a pagination mode is set for any non-root elements. If these
    // styles are specified on a root element, then they will be incorporated in
    // StyleResolver::styleForDocument().
    if ((style->overflowY() == OPAGEDX || style->overflowY() == OPAGEDY) && !(e && (e->hasTagName(htmlTag) || e->hasTagName(bodyTag))))
        setStylesForPaginationMode(WebCore::paginationModeForRenderStyle(style), style);

    // Table rows, sections and the table itself will support overflow:hidden and will ignore scroll/auto.
    // FIXME: Eventually table sections will support auto and scroll.
    if (style->display() == TABLE || style->display() == INLINE_TABLE
        || style->display() == TABLE_ROW_GROUP || style->display() == TABLE_ROW) {
        if (style->overflowX() != OVISIBLE && style->overflowX() != OHIDDEN)
            style->setOverflowX(OVISIBLE);
        if (style->overflowY() != OVISIBLE && style->overflowY() != OHIDDEN)
            style->setOverflowY(OVISIBLE);
    }

    // Menulists should have visible overflow
    if (style->appearance() == MenulistPart) {
        style->setOverflowX(OVISIBLE);
        style->setOverflowY(OVISIBLE);
    }

    // Cull out any useless layers and also repeat patterns into additional layers.
    style->adjustBackgroundLayers();
    style->adjustMaskLayers();

    // Do the same for animations and transitions.
    style->adjustAnimations();
    style->adjustTransitions();

    // Important: Intrinsic margins get added to controls before the theme has adjusted the style, since the theme will
    // alter fonts and heights/widths.
    if (e && e->isFormControlElement() && style->fontSize() >= 11) {
        // Don't apply intrinsic margins to image buttons. The designer knows how big the images are,
        // so we have to treat all image buttons as though they were explicitly sized.
        if (!e->hasTagName(inputTag) || !static_cast<HTMLInputElement*>(e)->isImageButton())
            addIntrinsicMargins(style);
    }

    // Let the theme also have a crack at adjusting the style.
    if (style->hasAppearance())
        RenderTheme::defaultTheme()->adjustStyle(this, style, e, state.hasUAAppearance(), state.borderData(), state.backgroundData(), state.backgroundColor());

    // If we have first-letter pseudo style, do not share this style.
    if (style->hasPseudoStyle(FIRST_LETTER))
        style->setUnique();

    // FIXME: when dropping the -webkit prefix on transform-style, we should also have opacity < 1 cause flattening.
    if (style->preserves3D() && (style->overflowX() != OVISIBLE
        || style->overflowY() != OVISIBLE
        || style->hasFilter()))
        style->setTransformStyle3D(TransformStyle3DFlat);

    // Seamless iframes behave like blocks. Map their display to inline-block when marked inline.
    if (e && e->hasTagName(iframeTag) && style->display() == INLINE && static_cast<HTMLIFrameElement*>(e)->shouldDisplaySeamlessly())
        style->setDisplay(INLINE_BLOCK);

#if ENABLE(SVG)
    if (e && e->isSVGElement()) {
        // Spec: http://www.w3.org/TR/SVG/masking.html#OverflowProperty
        if (style->overflowY() == OSCROLL)
            style->setOverflowY(OHIDDEN);
        else if (style->overflowY() == OAUTO)
            style->setOverflowY(OVISIBLE);

        if (style->overflowX() == OSCROLL)
            style->setOverflowX(OHIDDEN);
        else if (style->overflowX() == OAUTO)
            style->setOverflowX(OVISIBLE);

        // Only the root <svg> element in an SVG document fragment tree honors css position
        if (!(e->hasTagName(SVGNames::svgTag) && e->parentNode() && !e->parentNode()->isSVGElement()))
            style->setPosition(RenderStyle::initialPosition());

        // RenderSVGRoot handles zooming for the whole SVG subtree, so foreignObject content should
        // not be scaled again.
        if (e->hasTagName(SVGNames::foreignObjectTag))
            style->setEffectiveZoom(RenderStyle::initialZoom());
    }
#endif
}

bool StyleResolver::checkRegionStyle(Element* regionElement)
{
    // FIXME (BUG 72472): We don't add @-webkit-region rules of scoped style sheets for the moment,
    // so all region rules are global by default. Verify whether that can stand or needs changing.

    unsigned rulesSize = m_ruleSets.authorStyle()->m_regionSelectorsAndRuleSets.size();
    for (unsigned i = 0; i < rulesSize; ++i) {
        ASSERT(m_ruleSets.authorStyle()->m_regionSelectorsAndRuleSets.at(i).ruleSet.get());
        if (checkRegionSelector(m_ruleSets.authorStyle()->m_regionSelectorsAndRuleSets.at(i).selector, regionElement))
            return true;
    }

    if (m_ruleSets.userStyle()) {
        rulesSize = m_ruleSets.userStyle()->m_regionSelectorsAndRuleSets.size();
        for (unsigned i = 0; i < rulesSize; ++i) {
            ASSERT(m_ruleSets.userStyle()->m_regionSelectorsAndRuleSets.at(i).ruleSet.get());
            if (checkRegionSelector(m_ruleSets.userStyle()->m_regionSelectorsAndRuleSets.at(i).selector, regionElement))
                return true;
        }
    }

    return false;
}

static void checkForOrientationChange(RenderStyle* style)
{
    FontOrientation fontOrientation;
    NonCJKGlyphOrientation glyphOrientation;
    getFontAndGlyphOrientation(style, fontOrientation, glyphOrientation);

    const FontDescription& fontDescription = style->fontDescription();
    if (fontDescription.orientation() == fontOrientation && fontDescription.nonCJKGlyphOrientation() == glyphOrientation)
        return;

    FontDescription newFontDescription(fontDescription);
    newFontDescription.setNonCJKGlyphOrientation(glyphOrientation);
    newFontDescription.setOrientation(fontOrientation);
    style->setFontDescription(newFontDescription);
}

void StyleResolver::updateFont(State& state)
{
    if (!state.fontDirty())
        return;

    checkForTextSizeAdjust(state);
    RenderStyle* style = state.style();
    checkForGenericFamilyChange(state, style, state.parentStyle());
    checkForZoomChange(state, style, state.parentStyle());
    checkForOrientationChange(style);
    style->font().update(m_fontSelector);
    state.setFontDirty(false);
}

PassRefPtr<CSSRuleList> StyleResolver::styleRulesForElement(Element* e, unsigned rulesToInclude)
{
    return pseudoStyleRulesForElement(e, NOPSEUDO, rulesToInclude);
}

PassRefPtr<CSSRuleList> StyleResolver::pseudoStyleRulesForElement(Element* e, PseudoId pseudoId, unsigned rulesToInclude)
{
    if (!e || !e->document()->haveStylesheetsLoaded())
        return 0;

    State state(document());
    state.setMode(SelectorChecker::CollectingRules);

    initElement(state, e);
    state.initForStyleResolve(document(), e, 0, pseudoId);

    MatchResult dummy;
    if (rulesToInclude & UAAndUserCSSRules) {
        // First we match rules from the user agent sheet.
        matchUARules(state, dummy);

        // Now we check user sheet rules.
        if (m_matchAuthorAndUserStyles)
            matchUserRules(state, dummy, rulesToInclude & EmptyCSSRules);
    }

    if (m_matchAuthorAndUserStyles && (rulesToInclude & AuthorCSSRules)) {
        state.setSameOriginOnly(!(rulesToInclude & CrossOriginCSSRules));

        // Check the rules in author sheets.
        matchAuthorRules(state, dummy, rulesToInclude & EmptyCSSRules);
    }

    return state.takeRuleList();
}

inline bool StyleResolver::ruleMatches(State& state, const RuleData& ruleData, const ContainerNode* scope, PseudoId& dynamicPseudo, SelectorChecker::BehaviorAtBoundary behaviorAtBoundary)
{
    if (ruleData.hasFastCheckableSelector()) {
        // We know this selector does not include any pseudo elements.
        if (state.pseudoStyle() != NOPSEUDO)
            return false;
        // We know a sufficiently simple single part selector matches simply because we found it from the rule hash.
        // This is limited to HTML only so we don't need to check the namespace.
        if (ruleData.hasRightmostSelectorMatchingHTMLBasedOnRuleHash() && state.element()->isHTMLElement()) {
            if (!ruleData.hasMultipartSelector())
                return true;
        }
        if (ruleData.selector()->m_match == CSSSelector::Tag && !SelectorChecker::tagMatches(state.element(), ruleData.selector()->tagQName()))
            return false;
        if (!SelectorChecker::fastCheckRightmostAttributeSelector(state.element(), ruleData.selector()))
            return false;

        return SelectorChecker::fastCheck(ruleData.selector(), state.element());
    }

    // Slow path.
    SelectorChecker selectorChecker(document(), state.mode());
    SelectorChecker::SelectorCheckingContext context(ruleData.selector(), state.element(), SelectorChecker::VisitedMatchEnabled);
    context.elementStyle = state.style();
    context.scope = scope;
    context.pseudoStyle = state.pseudoStyle();
    context.behaviorAtBoundary = behaviorAtBoundary;
    SelectorChecker::Match match = selectorChecker.match(context, dynamicPseudo, DOMSiblingTraversalStrategy());
    if (match != SelectorChecker::SelectorMatches)
        return false;
    if (state.pseudoStyle() != NOPSEUDO && state.pseudoStyle() != dynamicPseudo)
        return false;
    return true;
}

bool StyleResolver::checkRegionSelector(const CSSSelector* regionSelector, Element* regionElement)
{
    if (!regionSelector || !regionElement)
        return false;

    SelectorChecker selectorChecker(document(), SelectorChecker::QueryingRules);
    for (const CSSSelector* s = regionSelector; s; s = CSSSelectorList::next(s))
        if (selectorChecker.matches(s, regionElement))
            return true;

    return false;
}

// -------------------------------------------------------------------------------------
// this is mostly boring stuff on how to apply a certain rule to the renderstyle...

Length StyleResolver::convertToIntLength(CSSPrimitiveValue* primitiveValue, RenderStyle* style, RenderStyle* rootStyle, double multiplier)
{
    return primitiveValue ? primitiveValue->convertToLength<FixedIntegerConversion | PercentConversion | CalculatedConversion | FractionConversion | ViewportPercentageConversion>(style, rootStyle, multiplier) : Length(Undefined);
}

Length StyleResolver::convertToFloatLength(CSSPrimitiveValue* primitiveValue, RenderStyle* style, RenderStyle* rootStyle, double multiplier)
{
    return primitiveValue ? primitiveValue->convertToLength<FixedFloatConversion | PercentConversion | CalculatedConversion | FractionConversion | ViewportPercentageConversion>(style, rootStyle, multiplier) : Length(Undefined);
}

template <StyleResolver::StyleApplicationPass pass>
void StyleResolver::applyProperties(State& state, const StylePropertySet* properties, StyleRule* rule, bool isImportant, bool inheritedOnly, PropertyWhitelistType propertyWhitelistType)
{
    ASSERT((propertyWhitelistType != PropertyWhitelistRegion) || state.regionForStyling());
    InspectorInstrumentationCookie cookie = InspectorInstrumentation::willProcessRule(document(), rule, this);

    unsigned propertyCount = properties->propertyCount();
    for (unsigned i = 0; i < propertyCount; ++i) {
        StylePropertySet::PropertyReference current = properties->propertyAt(i);
        if (isImportant != current.isImportant())
            continue;
        if (inheritedOnly && !current.isInherited()) {
            // If the property value is explicitly inherited, we need to apply further non-inherited properties
            // as they might override the value inherited here. For this reason we don't allow declarations with
            // explicitly inherited properties to be cached.
            ASSERT(!current.value()->isInheritedValue());
            continue;
        }
        CSSPropertyID property = current.id();

        if (propertyWhitelistType == PropertyWhitelistRegion && !StyleResolver::isValidRegionStyleProperty(property))
            continue;
#if ENABLE(VIDEO_TRACK)
        if (propertyWhitelistType == PropertyWhitelistCue && !StyleResolver::isValidCueStyleProperty(property))
            continue;
#endif
        switch (pass) {
#if ENABLE(CSS_VARIABLES)
        case VariableDefinitions:
            COMPILE_ASSERT(CSSPropertyVariable < firstCSSProperty, CSS_variable_is_before_first_property);
            if (property == CSSPropertyVariable)
                applyProperty(state, current.id(), current.value());
            break;
#endif
        case HighPriorityProperties:
            COMPILE_ASSERT(firstCSSProperty == CSSPropertyColor, CSS_color_is_first_property);
            COMPILE_ASSERT(CSSPropertyZoom == CSSPropertyColor + 18, CSS_zoom_is_end_of_first_prop_range);
            COMPILE_ASSERT(CSSPropertyLineHeight == CSSPropertyZoom + 1, CSS_line_height_is_after_zoom);
#if ENABLE(CSS_VARIABLES)
            if (property == CSSPropertyVariable)
                continue;
#endif
            // give special priority to font-xxx, color properties, etc
            if (property < CSSPropertyLineHeight)
                applyProperty(state, current.id(), current.value());
            // we apply line-height later
            else if (property == CSSPropertyLineHeight)
                state.setLineHeightValue(current.value());
            break;
        case LowPriorityProperties:
            if (property > CSSPropertyLineHeight)
                applyProperty(state, current.id(), current.value());
        }
    }
    InspectorInstrumentation::didProcessRule(cookie);
}

template <StyleResolver::StyleApplicationPass pass>
void StyleResolver::applyMatchedProperties(State& state, const MatchResult& matchResult, bool isImportant, int startIndex, int endIndex, bool inheritedOnly)
{
    if (startIndex == -1)
        return;

    if (state.style()->insideLink() != NotInsideLink) {
        for (int i = startIndex; i <= endIndex; ++i) {
            const MatchedProperties& matchedProperties = matchResult.matchedProperties[i];
            unsigned linkMatchType = matchedProperties.linkMatchType;
            // FIXME: It would be nicer to pass these as arguments but that requires changes in many places.
            state.setApplyPropertyToRegularStyle(linkMatchType & SelectorChecker::MatchLink);
            state.setApplyPropertyToVisitedLinkStyle(linkMatchType & SelectorChecker::MatchVisited);

            applyProperties<pass>(state, matchedProperties.properties.get(), matchResult.matchedRules[i], isImportant, inheritedOnly, static_cast<PropertyWhitelistType>(matchedProperties.whitelistType));
        }
        state.setApplyPropertyToRegularStyle(true);
        state.setApplyPropertyToVisitedLinkStyle(false);
        return;
    }
    for (int i = startIndex; i <= endIndex; ++i) {
        const MatchedProperties& matchedProperties = matchResult.matchedProperties[i];
        applyProperties<pass>(state, matchedProperties.properties.get(), matchResult.matchedRules[i], isImportant, inheritedOnly, static_cast<PropertyWhitelistType>(matchedProperties.whitelistType));
    }
}

unsigned StyleResolver::computeMatchedPropertiesHash(const MatchedProperties* properties, unsigned size)
{
    
    return StringHasher::hashMemory(properties, sizeof(MatchedProperties) * size);
}

bool operator==(const StyleResolver::MatchRanges& a, const StyleResolver::MatchRanges& b)
{
    return a.firstUARule == b.firstUARule
        && a.lastUARule == b.lastUARule
        && a.firstAuthorRule == b.firstAuthorRule
        && a.lastAuthorRule == b.lastAuthorRule
        && a.firstUserRule == b.firstUserRule
        && a.lastUserRule == b.lastUserRule;
}

bool operator!=(const StyleResolver::MatchRanges& a, const StyleResolver::MatchRanges& b)
{
    return !(a == b);
}

bool operator==(const StyleResolver::MatchedProperties& a, const StyleResolver::MatchedProperties& b)
{
    return a.properties == b.properties && a.linkMatchType == b.linkMatchType;
}

bool operator!=(const StyleResolver::MatchedProperties& a, const StyleResolver::MatchedProperties& b)
{
    return !(a == b);
}

const StyleResolver::MatchedPropertiesCacheItem* StyleResolver::findFromMatchedPropertiesCache(unsigned hash, const MatchResult& matchResult)
{
    ASSERT(hash);

    MatchedPropertiesCache::iterator it = m_matchedPropertiesCache.find(hash);
    if (it == m_matchedPropertiesCache.end())
        return 0;
    MatchedPropertiesCacheItem& cacheItem = it->value;

    size_t size = matchResult.matchedProperties.size();
    if (size != cacheItem.matchedProperties.size())
        return 0;
    for (size_t i = 0; i < size; ++i) {
        if (matchResult.matchedProperties[i] != cacheItem.matchedProperties[i])
            return 0;
    }
    if (cacheItem.ranges != matchResult.ranges)
        return 0;
    return &cacheItem;
}

void StyleResolver::addToMatchedPropertiesCache(const RenderStyle* style, const RenderStyle* parentStyle, unsigned hash, const MatchResult& matchResult)
{
    static const unsigned matchedDeclarationCacheAdditionsBetweenSweeps = 100;
    if (++m_matchedPropertiesCacheAdditionsSinceLastSweep >= matchedDeclarationCacheAdditionsBetweenSweeps
        && !m_matchedPropertiesCacheSweepTimer.isActive()) {
        static const unsigned matchedDeclarationCacheSweepTimeInSeconds = 60;
        m_matchedPropertiesCacheSweepTimer.startOneShot(matchedDeclarationCacheSweepTimeInSeconds);
    }

    ASSERT(hash);
    MatchedPropertiesCacheItem cacheItem;
    cacheItem.matchedProperties.append(matchResult.matchedProperties);
    cacheItem.ranges = matchResult.ranges;
    // Note that we don't cache the original RenderStyle instance. It may be further modified.
    // The RenderStyle in the cache is really just a holder for the substructures and never used as-is.
    cacheItem.renderStyle = RenderStyle::clone(style);
    cacheItem.parentRenderStyle = RenderStyle::clone(parentStyle);
    m_matchedPropertiesCache.add(hash, cacheItem);
}

void StyleResolver::invalidateMatchedPropertiesCache()
{
    m_matchedPropertiesCache.clear();
}

static bool isCacheableInMatchedPropertiesCache(const Element* element, const RenderStyle* style, const RenderStyle* parentStyle)
{
    // FIXME: CSSPropertyWebkitWritingMode modifies state when applying to document element. We can't skip the applying by caching.
    if (element == element->document()->documentElement() && element->document()->writingModeSetOnDocumentElement())
        return false;
    if (style->unique() || (style->styleType() != NOPSEUDO && parentStyle->unique()))
        return false;
    if (style->hasAppearance())
        return false;
    if (style->zoom() != RenderStyle::initialZoom())
        return false;
    if (style->writingMode() != RenderStyle::initialWritingMode())
        return false;
    // The cache assumes static knowledge about which properties are inherited.
    if (parentStyle->hasExplicitlyInheritedProperties())
        return false;
    return true;
}

void StyleResolver::applyMatchedProperties(State& state, const MatchResult& matchResult, const Element* element)
{
    ASSERT(element);
    unsigned cacheHash = matchResult.isCacheable ? computeMatchedPropertiesHash(matchResult.matchedProperties.data(), matchResult.matchedProperties.size()) : 0;
    bool applyInheritedOnly = false;
    const MatchedPropertiesCacheItem* cacheItem = 0;
    if (cacheHash && (cacheItem = findFromMatchedPropertiesCache(cacheHash, matchResult))) {
        // We can build up the style by copying non-inherited properties from an earlier style object built using the same exact
        // style declarations. We then only need to apply the inherited properties, if any, as their values can depend on the 
        // element context. This is fast and saves memory by reusing the style data structures.
        state.style()->copyNonInheritedFrom(cacheItem->renderStyle.get());
        if (state.parentStyle()->inheritedDataShared(cacheItem->parentRenderStyle.get()) && !isAtShadowBoundary(element)) {
            EInsideLink linkStatus = state.style()->insideLink();
            // If the cache item parent style has identical inherited properties to the current parent style then the
            // resulting style will be identical too. We copy the inherited properties over from the cache and are done.
            state.style()->inheritFrom(cacheItem->renderStyle.get());

            // Unfortunately the link status is treated like an inherited property. We need to explicitly restore it.
            state.style()->setInsideLink(linkStatus);
            return;
        }
        applyInheritedOnly = true; 
    }

#if ENABLE(CSS_VARIABLES)
    // First apply all variable definitions, as they may be used during application of later properties.
    applyMatchedProperties<VariableDefinitions>(state, matchResult, false, 0, matchResult.matchedProperties.size() - 1, applyInheritedOnly);
    applyMatchedProperties<VariableDefinitions>(state, matchResult, true, matchResult.ranges.firstAuthorRule, matchResult.ranges.lastAuthorRule, applyInheritedOnly);
    applyMatchedProperties<VariableDefinitions>(state, matchResult, true, matchResult.ranges.firstUserRule, matchResult.ranges.lastUserRule, applyInheritedOnly);
    applyMatchedProperties<VariableDefinitions>(state, matchResult, true, matchResult.ranges.firstUARule, matchResult.ranges.lastUARule, applyInheritedOnly);
#endif

    // 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.
    state.setLineHeightValue(0);
    applyMatchedProperties<HighPriorityProperties>(state, matchResult, false, 0, matchResult.matchedProperties.size() - 1, applyInheritedOnly);
    applyMatchedProperties<HighPriorityProperties>(state, matchResult, true, matchResult.ranges.firstAuthorRule, matchResult.ranges.lastAuthorRule, applyInheritedOnly);
    applyMatchedProperties<HighPriorityProperties>(state, matchResult, true, matchResult.ranges.firstUserRule, matchResult.ranges.lastUserRule, applyInheritedOnly);
    applyMatchedProperties<HighPriorityProperties>(state, matchResult, true, matchResult.ranges.firstUARule, matchResult.ranges.lastUARule, applyInheritedOnly);

    if (cacheItem && cacheItem->renderStyle->effectiveZoom() != state.style()->effectiveZoom()) {
        state.setFontDirty(true);
        applyInheritedOnly = false;
    }

    // If our font got dirtied, go ahead and update it now.
    updateFont(state);

    // Line-height is set when we are sure we decided on the font-size.
    if (state.lineHeightValue())
        applyProperty(state, CSSPropertyLineHeight, state.lineHeightValue());

    // Many properties depend on the font. If it changes we just apply all properties.
    if (cacheItem && cacheItem->renderStyle->fontDescription() != state.style()->fontDescription())
        applyInheritedOnly = false;

    // Now do the normal priority UA properties.
    applyMatchedProperties<LowPriorityProperties>(state, matchResult, false, matchResult.ranges.firstUARule, matchResult.ranges.lastUARule, applyInheritedOnly);
    
    // Cache our border and background so that we can examine them later.
    state.cacheBorderAndBackground();
    
    // Now do the author and user normal priority properties and all the !important properties.
    applyMatchedProperties<LowPriorityProperties>(state, matchResult, false, matchResult.ranges.lastUARule + 1, matchResult.matchedProperties.size() - 1, applyInheritedOnly);
    applyMatchedProperties<LowPriorityProperties>(state, matchResult, true, matchResult.ranges.firstAuthorRule, matchResult.ranges.lastAuthorRule, applyInheritedOnly);
    applyMatchedProperties<LowPriorityProperties>(state, matchResult, true, matchResult.ranges.firstUserRule, matchResult.ranges.lastUserRule, applyInheritedOnly);
    applyMatchedProperties<LowPriorityProperties>(state, matchResult, true, matchResult.ranges.firstUARule, matchResult.ranges.lastUARule, applyInheritedOnly);
   
    // Start loading resources referenced by this style.
    loadPendingResources(state);
    
    ASSERT(!state.fontDirty());
    
    if (cacheItem || !cacheHash)
        return;
    if (!isCacheableInMatchedPropertiesCache(state.element(), state.style(), state.parentStyle()))
        return;
    addToMatchedPropertiesCache(state.style(), state.parentStyle(), cacheHash, matchResult);
}

static inline bool comparePageRules(const StyleRulePage* r1, const StyleRulePage* r2)
{
    return r1->selector()->specificity() < r2->selector()->specificity();
}

void StyleResolver::matchPageRules(MatchResult& result, RuleSet* rules, bool isLeftPage, bool isFirstPage, const String& pageName)
{
    if (!rules)
        return;

    Vector<StyleRulePage*> matchedPageRules;
    matchPageRulesForList(matchedPageRules, rules->pageRules(), isLeftPage, isFirstPage, pageName);
    if (matchedPageRules.isEmpty())
        return;

    std::stable_sort(matchedPageRules.begin(), matchedPageRules.end(), comparePageRules);

    for (unsigned i = 0; i < matchedPageRules.size(); i++)
        addMatchedProperties(result, matchedPageRules[i]->properties());
}

static bool checkPageSelectorComponents(const CSSSelector* selector, bool isLeftPage, bool isFirstPage, const String& pageName)
{
    for (const CSSSelector* component = selector; component; component = component->tagHistory()) {
        if (component->m_match == CSSSelector::Tag) {
            const AtomicString& localName = component->tagQName().localName();
            if (localName != starAtom && localName != pageName)
                return false;
        }

        CSSSelector::PseudoType pseudoType = component->pseudoType();
        if ((pseudoType == CSSSelector::PseudoLeftPage && !isLeftPage)
            || (pseudoType == CSSSelector::PseudoRightPage && isLeftPage)
            || (pseudoType == CSSSelector::PseudoFirstPage && !isFirstPage))
        {
            return false;
        }
    }
    return true;
}

void StyleResolver::matchPageRulesForList(Vector<StyleRulePage*>& matchedRules, const Vector<StyleRulePage*>& rules, bool isLeftPage, bool isFirstPage, const String& pageName)
{
    for (unsigned i = 0; i < rules.size(); ++i) {
        StyleRulePage* rule = rules[i];

        if (!checkPageSelectorComponents(rule->selector(), isLeftPage, isFirstPage, pageName))
            continue;

        // If the rule has no properties to apply, then ignore it.
        const StylePropertySet* properties = rule->properties();
        if (!properties || properties->isEmpty())
            continue;

        // Add this rule to our list of matched rules.
        matchedRules.append(rule);
    }
}

bool StyleResolver::isLeftPage(State& state, int pageIndex) const
{
    bool isFirstPageLeft = false;
    if (!state.rootElementStyle()->isLeftToRightDirection())
        isFirstPageLeft = true;

    return (pageIndex + (isFirstPageLeft ? 1 : 0)) % 2;
}

bool StyleResolver::isFirstPage(int pageIndex) const
{
    // FIXME: In case of forced left/right page, page at index 1 (not 0) can be the first page.
    return (!pageIndex);
}

String StyleResolver::pageName(int /* pageIndex */) const
{
    // FIXME: Implement page index to page name mapping.
    return "";
}

void StyleResolver::applyPropertyWithNullCheck(State& state, CSSPropertyID id, CSSValue* value)
{
    if (!value)
        return;
    applyProperty(state, id, value);
}

void StyleResolver::applyFontPropertyToStyle(RenderStyle* style, const StylePropertySet* parsedStyle)
{
    State state(document());
    state.initForStyleResolve(document(), 0, style);
    state.setStyle(style);

    applyPropertyWithNullCheck(state, CSSPropertyFontFamily, parsedStyle->getPropertyCSSValue(CSSPropertyFontFamily).get());
    applyPropertyWithNullCheck(state, CSSPropertyFontStyle, parsedStyle->getPropertyCSSValue(CSSPropertyFontStyle).get());
    applyPropertyWithNullCheck(state, CSSPropertyFontVariant, parsedStyle->getPropertyCSSValue(CSSPropertyFontVariant).get());
    applyPropertyWithNullCheck(state, CSSPropertyFontWeight, parsedStyle->getPropertyCSSValue(CSSPropertyFontWeight).get());

    // As described in BUG66291, setting font-size and line-height on a font may entail a CSSPrimitiveValue::computeLengthDouble call,
    // which assumes the fontMetrics are available for the affected font, otherwise a crash occurs (see http://trac.webkit.org/changeset/96122).
    // The updateFont() calls below update the fontMetrics and ensure the proper setting of font-size and line-height.
    updateFont(state);
    applyPropertyWithNullCheck(state, CSSPropertyFontSize, parsedStyle->getPropertyCSSValue(CSSPropertyFontSize).get());
    updateFont(state);
    applyPropertyWithNullCheck(state, CSSPropertyLineHeight, parsedStyle->getPropertyCSSValue(CSSPropertyLineHeight).get());
}

inline bool isValidVisitedLinkProperty(CSSPropertyID id)
{
    switch (id) {
    case CSSPropertyBackgroundColor:
    case CSSPropertyBorderLeftColor:
    case CSSPropertyBorderRightColor:
    case CSSPropertyBorderTopColor:
    case CSSPropertyBorderBottomColor:
    case CSSPropertyColor:
    case CSSPropertyOutlineColor:
    case CSSPropertyWebkitColumnRuleColor:
    case CSSPropertyWebkitTextEmphasisColor:
    case CSSPropertyWebkitTextFillColor:
    case CSSPropertyWebkitTextStrokeColor:
    // Also allow shorthands so that inherit/initial still work.
    case CSSPropertyBackground:
    case CSSPropertyBorderLeft:
    case CSSPropertyBorderRight:
    case CSSPropertyBorderTop:
    case CSSPropertyBorderBottom:
    case CSSPropertyOutline:
    case CSSPropertyWebkitColumnRule:
#if ENABLE(SVG)
    case CSSPropertyFill:
    case CSSPropertyStroke:
#endif
        return true;
    default:
        break;
    }

    return false;
}

// http://dev.w3.org/csswg/css3-regions/#the-at-region-style-rule
// FIXME: add incremental support for other region styling properties.
inline bool StyleResolver::isValidRegionStyleProperty(CSSPropertyID id)
{
    switch (id) {
    case CSSPropertyBackgroundColor:
    case CSSPropertyColor:
        return true;
    default:
        break;
    }

    return false;
}

#if ENABLE(VIDEO_TRACK)
inline bool StyleResolver::isValidCueStyleProperty(CSSPropertyID id)
{
    switch (id) {
    case CSSPropertyBackground:
    case CSSPropertyBackgroundAttachment:
    case CSSPropertyBackgroundClip:
    case CSSPropertyBackgroundColor:
    case CSSPropertyBackgroundImage:
    case CSSPropertyBackgroundOrigin:
    case CSSPropertyBackgroundPosition:
    case CSSPropertyBackgroundPositionX:
    case CSSPropertyBackgroundPositionY:
    case CSSPropertyBackgroundRepeat:
    case CSSPropertyBackgroundRepeatX:
    case CSSPropertyBackgroundRepeatY:
    case CSSPropertyBackgroundSize:
    case CSSPropertyColor:
    case CSSPropertyFont:
    case CSSPropertyFontFamily:
    case CSSPropertyFontSize:
    case CSSPropertyFontStyle:
    case CSSPropertyFontVariant:
    case CSSPropertyFontWeight:
    case CSSPropertyLineHeight:
    case CSSPropertyOpacity:
    case CSSPropertyOutline:
    case CSSPropertyOutlineColor:
    case CSSPropertyOutlineOffset:
    case CSSPropertyOutlineStyle:
    case CSSPropertyOutlineWidth:
    case CSSPropertyVisibility:
    case CSSPropertyWhiteSpace:
    case CSSPropertyTextDecoration:
    case CSSPropertyTextShadow:
    case CSSPropertyBorderStyle:
        return true;
    default:
        break;
    }
    return false;
}
#endif
// SVG handles zooming in a different way compared to CSS. The whole document is scaled instead
// of each individual length value in the render style / tree. CSSPrimitiveValue::computeLength*()
// multiplies each resolved length with the zoom multiplier - so for SVG we need to disable that.
// Though all CSS values that can be applied to outermost <svg> elements (width/height/border/padding...)
// need to respect the scaling. RenderBox (the parent class of RenderSVGRoot) grabs values like
// width/height/border/padding/... from the RenderStyle -> for SVG these values would never scale,
// if we'd pass a 1.0 zoom factor everyhwere. So we only pass a zoom factor of 1.0 for specific
// properties that are NOT allowed to scale within a zoomed SVG document (letter/word-spacing/font-size).

static bool createGridTrackBreadth(CSSPrimitiveValue* primitiveValue, const StyleResolver::State& state, Length& workingLength)
{
    if (primitiveValue->getIdent() == CSSValueWebkitMinContent) {
        workingLength = Length(MinContent);
        return true;
    }

    if (primitiveValue->getIdent() == CSSValueWebkitMaxContent) {
        workingLength = Length(MaxContent);
        return true;
    }

    workingLength = primitiveValue->convertToLength<FixedIntegerConversion | PercentConversion | ViewportPercentageConversion | AutoConversion>(state.style(), state.rootElementStyle(), state.style()->effectiveZoom());
    if (workingLength.isUndefined())
        return false;

    if (primitiveValue->isLength())
        workingLength.setQuirk(primitiveValue->isQuirkValue());

    return true;
}

static bool createGridTrackMinMax(CSSPrimitiveValue* primitiveValue, const StyleResolver::State& state, GridTrackSize& trackSize)
{
    Pair* minMaxTrackBreadth = primitiveValue->getPairValue();
    if (!minMaxTrackBreadth) {
        Length workingLength;
        if (!createGridTrackBreadth(primitiveValue, state, workingLength))
            return false;

        trackSize.setLength(workingLength);
        return true;
    }

    Length minTrackBreadth;
    Length maxTrackBreadth;
    if (!createGridTrackBreadth(minMaxTrackBreadth->first(), state, minTrackBreadth) || !createGridTrackBreadth(minMaxTrackBreadth->second(), state, maxTrackBreadth))
        return false;

    trackSize.setMinMax(minTrackBreadth, maxTrackBreadth);
    return true;
}

static bool createGridTrackGroup(CSSValue* value, const StyleResolver::State& state, Vector<GridTrackSize>& trackSizes)
{
    if (!value->isValueList())
        return false;

    for (CSSValueListIterator i = value; i.hasMore(); i.advance()) {
        CSSValue* currValue = i.value();
        if (!currValue->isPrimitiveValue())
            return false;

        GridTrackSize trackSize;
        if (!createGridTrackMinMax(static_cast<CSSPrimitiveValue*>(currValue), state, trackSize))
            return false;

        trackSizes.append(trackSize);
    }
    return true;
}

static bool createGridTrackList(CSSValue* value, Vector<GridTrackSize>& trackSizes, const StyleResolver::State& state)
{
    // Handle 'none'.
    if (value->isPrimitiveValue()) {
        CSSPrimitiveValue* primitiveValue = static_cast<CSSPrimitiveValue*>(value);
        return primitiveValue->getIdent() == CSSValueNone;
    }

    return createGridTrackGroup(value, state, trackSizes);
}


static bool createGridPosition(CSSValue* value, GridPosition& position)
{
    // For now, we only accept: <integer> | 'auto'
    if (!value->isPrimitiveValue())
        return false;

    CSSPrimitiveValue* primitiveValue = static_cast<CSSPrimitiveValue*>(value);
    if (primitiveValue->getIdent() == CSSValueAuto)
        return true;

    ASSERT_WITH_SECURITY_IMPLICATION(primitiveValue->isNumber());
    position.setIntegerPosition(primitiveValue->getIntValue());
    return true;
}

#if ENABLE(CSS_VARIABLES)
static bool hasVariableReference(CSSValue* value)
{
    if (value->isPrimitiveValue()) {
        CSSPrimitiveValue* primitiveValue = static_cast<CSSPrimitiveValue*>(value);
        return primitiveValue->hasVariableReference();
    }

    if (value->isCalculationValue())
        return static_cast<CSSCalcValue*>(value)->hasVariableReference();

    if (value->isReflectValue()) {
        CSSReflectValue* reflectValue = static_cast<CSSReflectValue*>(value);
        CSSPrimitiveValue* direction = reflectValue->direction();
        CSSPrimitiveValue* offset = reflectValue->offset();
        CSSValue* mask = reflectValue->mask();
        return (direction && hasVariableReference(direction)) || (offset && hasVariableReference(offset)) || (mask && hasVariableReference(mask));
    }

    for (CSSValueListIterator i = value; i.hasMore(); i.advance()) {
        if (hasVariableReference(i.value()))
            return true;
    }

    return false;
}

void StyleResolver::resolveVariables(State& state, CSSPropertyID id, CSSValue* value, Vector<std::pair<CSSPropertyID, String> >& knownExpressions)
{
    std::pair<CSSPropertyID, String> expression(id, value->serializeResolvingVariables(*state.style()->variables()));

    if (knownExpressions.contains(expression))
        return; // cycle detected.

    knownExpressions.append(expression);

    // FIXME: It would be faster not to re-parse from strings, but for now CSS property validation lives inside the parser so we do it there.
    RefPtr<StylePropertySet> resultSet = StylePropertySet::create();
    if (!CSSParser::parseValue(resultSet.get(), id, expression.second, false, document()))
        return; // expression failed to parse.

    for (unsigned i = 0; i < resultSet->propertyCount(); i++) {
        StylePropertySet::PropertyReference property = resultSet->propertyAt(i);
        if (property.id() != CSSPropertyVariable && hasVariableReference(property.value()))
            resolveVariables(state, property.id(), property.value(), knownExpressions);
        else
            applyProperty(state, property.id(), property.value());
    }
}
#endif

void StyleResolver::applyProperty(State& state, CSSPropertyID id, CSSValue* value)
{
#if ENABLE(CSS_VARIABLES)
    if (id != CSSPropertyVariable && hasVariableReference(value)) {
        Vector<std::pair<CSSPropertyID, String> > knownExpressions;
        resolveVariables(state, id, value, knownExpressions);
        return;
    }
#endif

    bool isInherit = state.parentNode() && value->isInheritedValue();
    bool isInitial = value->isInitialValue() || (!state.parentNode() && value->isInheritedValue());

    ASSERT(!isInherit || !isInitial); // isInherit -> !isInitial && isInitial -> !isInherit
    ASSERT(!isInherit || (state.parentNode() && state.parentStyle())); // isInherit -> (state.parentNode() && state.parentStyle())

    if (!state.applyPropertyToRegularStyle() && (!state.applyPropertyToVisitedLinkStyle() || !isValidVisitedLinkProperty(id))) {
        // Limit the properties that can be applied to only the ones honored by :visited.
        return;
    }

    if (isInherit && !state.parentStyle()->hasExplicitlyInheritedProperties() && !CSSProperty::isInheritedProperty(id))
        state.parentStyle()->setHasExplicitlyInheritedProperties();

#if ENABLE(CSS_VARIABLES)
    if (id == CSSPropertyVariable) {
        ASSERT_WITH_SECURITY_IMPLICATION(value->isVariableValue());
        CSSVariableValue* variable = static_cast<CSSVariableValue*>(value);
        ASSERT(!variable->name().isEmpty());
        ASSERT(!variable->value().isEmpty());
        state.style()->setVariable(variable->name(), variable->value());
        return;
    }
#endif

    // Check lookup table for implementations and use when available.
    const PropertyHandler& handler = m_styleBuilder.propertyHandler(id);
    if (handler.isValid()) {
        if (isInherit)
            handler.applyInheritValue(id, state);
        else if (isInitial)
            handler.applyInitialValue(id, state);
        else
            handler.applyValue(id, state, value);
        return;
    }

    CSSPrimitiveValue* primitiveValue = value->isPrimitiveValue() ? static_cast<CSSPrimitiveValue*>(value) : 0;

    float zoomFactor = state.style()->effectiveZoom();

    // What follows is a list that maps the CSS properties into their corresponding front-end
    // RenderStyle values. Shorthands (e.g. border, background) occur in this list as well and
    // are only hit when mapping "inherit" or "initial" into front-end values.
    switch (id) {
    // lists
    case CSSPropertyContent:
        // list of string, uri, counter, attr, i
        {
            // FIXME: In CSS3, it will be possible to inherit content. In CSS2 it is not. This
            // note is a reminder that eventually "inherit" needs to be supported.

            if (isInitial) {
                state.style()->clearContent();
                return;
            }

            if (!value->isValueList())
                return;

            bool didSet = false;
            for (CSSValueListIterator i = value; i.hasMore(); i.advance()) {
                CSSValue* item = i.value();
                if (item->isImageGeneratorValue()) {
                    if (item->isGradientValue())
                        state.style()->setContent(StyleGeneratedImage::create(static_cast<CSSGradientValue*>(item)->gradientWithStylesResolved(state).get()), didSet);
                    else
                        state.style()->setContent(StyleGeneratedImage::create(static_cast<CSSImageGeneratorValue*>(item)), didSet);
                    didSet = true;
#if ENABLE(CSS_IMAGE_SET)
                } else if (item->isImageSetValue()) {
                    state.style()->setContent(setOrPendingFromValue(state, CSSPropertyContent, static_cast<CSSImageSetValue*>(item)), didSet);
                    didSet = true;
#endif
                }

                if (item->isImageValue()) {
                    state.style()->setContent(cachedOrPendingFromValue(state, CSSPropertyContent, static_cast<CSSImageValue*>(item)), didSet);
                    didSet = true;
                    continue;
                }

                if (!item->isPrimitiveValue())
                    continue;

                CSSPrimitiveValue* contentValue = static_cast<CSSPrimitiveValue*>(item);

                if (contentValue->isString()) {
                    state.style()->setContent(contentValue->getStringValue().impl(), didSet);
                    didSet = true;
                } else if (contentValue->isAttr()) {
                    // FIXME: Can a namespace be specified for an attr(foo)?
                    if (state.style()->styleType() == NOPSEUDO)
                        state.style()->setUnique();
                    else
                        state.parentStyle()->setUnique();
                    QualifiedName attr(nullAtom, contentValue->getStringValue().impl(), nullAtom);
                    const AtomicString& value = state.element()->getAttribute(attr);
                    state.style()->setContent(value.isNull() ? emptyAtom : value.impl(), didSet);
                    didSet = true;
                    // register the fact that the attribute value affects the style
                    m_ruleSets.features().attrsInRules.add(attr.localName().impl());
                } else if (contentValue->isCounter()) {
                    Counter* counterValue = contentValue->getCounterValue();
                    EListStyleType listStyleType = NoneListStyle;
                    int listStyleIdent = counterValue->listStyleIdent();
                    if (listStyleIdent != CSSValueNone)
                        listStyleType = static_cast<EListStyleType>(listStyleIdent - CSSValueDisc);
                    OwnPtr<CounterContent> counter = adoptPtr(new CounterContent(counterValue->identifier(), listStyleType, counterValue->separator()));
                    state.style()->setContent(counter.release(), didSet);
                    didSet = true;
                } else {
                    switch (contentValue->getIdent()) {
                    case CSSValueOpenQuote:
                        state.style()->setContent(OPEN_QUOTE, didSet);
                        didSet = true;
                        break;
                    case CSSValueCloseQuote:
                        state.style()->setContent(CLOSE_QUOTE, didSet);
                        didSet = true;
                        break;
                    case CSSValueNoOpenQuote:
                        state.style()->setContent(NO_OPEN_QUOTE, didSet);
                        didSet = true;
                        break;
                    case CSSValueNoCloseQuote:
                        state.style()->setContent(NO_CLOSE_QUOTE, didSet);
                        didSet = true;
                        break;
                    default:
                        // normal and none do not have any effect.
                        { }
                    }
                }
            }
            if (!didSet)
                state.style()->clearContent();
            return;
        }
    case CSSPropertyQuotes:
        if (isInherit) {
            state.style()->setQuotes(state.parentStyle()->quotes());
            return;
        }
        if (isInitial) {
            state.style()->setQuotes(0);
            return;
        }
        if (value->isValueList()) {
            CSSValueList* list = static_cast<CSSValueList*>(value);
            RefPtr<QuotesData> quotes = QuotesData::create();
            for (size_t i = 0; i < list->length(); i += 2) {
                CSSValue* first = list->itemWithoutBoundsCheck(i);
                // item() returns null if out of bounds so this is safe.
                CSSValue* second = list->item(i + 1);
                if (!second)
                    continue;
                ASSERT_WITH_SECURITY_IMPLICATION(first->isPrimitiveValue());
                ASSERT_WITH_SECURITY_IMPLICATION(second->isPrimitiveValue());
                String startQuote = static_cast<CSSPrimitiveValue*>(first)->getStringValue();
                String endQuote = static_cast<CSSPrimitiveValue*>(second)->getStringValue();
                quotes->addPair(std::make_pair(startQuote, endQuote));
            }
            state.style()->setQuotes(quotes);
            return;
        }
        if (primitiveValue) {
            if (primitiveValue->getIdent() == CSSValueNone)
                state.style()->setQuotes(QuotesData::create());
        }
        return;
    case CSSPropertyFontFamily: {
        // list of strings and ids
        if (isInherit) {
            FontDescription parentFontDescription = state.parentStyle()->fontDescription();
            FontDescription fontDescription = state.style()->fontDescription();
            fontDescription.setGenericFamily(parentFontDescription.genericFamily());
            fontDescription.setFamily(parentFontDescription.firstFamily());
            fontDescription.setIsSpecifiedFont(parentFontDescription.isSpecifiedFont());
            state.setFontDescription(fontDescription);
            return;
        }

        if (isInitial) {
            FontDescription initialDesc = FontDescription();
            FontDescription fontDescription = state.style()->fontDescription();
            // We need to adjust the size to account for the generic family change from monospace
            // to non-monospace.
            if (fontDescription.keywordSize() && fontDescription.useFixedDefaultSize())
                setFontSize(state, fontDescription, fontSizeForKeyword(document(), CSSValueXxSmall + fontDescription.keywordSize() - 1, false));
            fontDescription.setGenericFamily(initialDesc.genericFamily());
            if (!initialDesc.firstFamily().familyIsEmpty())
                fontDescription.setFamily(initialDesc.firstFamily());
            state.setFontDescription(fontDescription);
            return;
        }

        if (!value->isValueList())
            return;
        FontDescription fontDescription = state.style()->fontDescription();
        FontFamily& firstFamily = fontDescription.firstFamily();
        FontFamily* currFamily = 0;

        // Before mapping in a new font-family property, we should reset the generic family.
        bool oldFamilyUsedFixedDefaultSize = fontDescription.useFixedDefaultSize();
        fontDescription.setGenericFamily(FontDescription::NoFamily);

        for (CSSValueListIterator i = value; i.hasMore(); i.advance()) {
            CSSValue* item = i.value();
            if (!item->isPrimitiveValue())
                continue;
            CSSPrimitiveValue* contentValue = static_cast<CSSPrimitiveValue*>(item);
            AtomicString face;
            Settings* settings = documentSettings();
            if (contentValue->isString())
                face = contentValue->getStringValue();
            else if (settings) {
                switch (contentValue->getIdent()) {
                case CSSValueWebkitBody:
                    face = settings->standardFontFamily();
                    break;
                case CSSValueSerif:
                    face = serifFamily;
                    fontDescription.setGenericFamily(FontDescription::SerifFamily);
                    break;
                case CSSValueSansSerif:
                    face = sansSerifFamily;
                    fontDescription.setGenericFamily(FontDescription::SansSerifFamily);
                    break;
                case CSSValueCursive:
                    face = cursiveFamily;
                    fontDescription.setGenericFamily(FontDescription::CursiveFamily);
                    break;
                case CSSValueFantasy:
                    face = fantasyFamily;
                    fontDescription.setGenericFamily(FontDescription::FantasyFamily);
                    break;
                case CSSValueMonospace:
                    face = monospaceFamily;
                    fontDescription.setGenericFamily(FontDescription::MonospaceFamily);
                    break;
                case CSSValueWebkitPictograph:
                    face = pictographFamily;
                    fontDescription.setGenericFamily(FontDescription::PictographFamily);
                    break;
                }
            }

            if (!face.isEmpty()) {
                if (!currFamily) {
                    // Filling in the first family.
                    firstFamily.setFamily(face);
                    firstFamily.appendFamily(0); // Remove any inherited family-fallback list.
                    currFamily = &firstFamily;
                    fontDescription.setIsSpecifiedFont(fontDescription.genericFamily() == FontDescription::NoFamily);
                } else {
                    RefPtr<SharedFontFamily> newFamily = SharedFontFamily::create();
                    newFamily->setFamily(face);
                    currFamily->appendFamily(newFamily);
                    currFamily = newFamily.get();
                }
            }
        }

        // We can't call useFixedDefaultSize() until all new font families have been added
        // If currFamily is non-zero then we set at least one family on this description.
        if (currFamily) {
            if (fontDescription.keywordSize() && fontDescription.useFixedDefaultSize() != oldFamilyUsedFixedDefaultSize)
                setFontSize(state, fontDescription, fontSizeForKeyword(document(), CSSValueXxSmall + fontDescription.keywordSize() - 1, !oldFamilyUsedFixedDefaultSize));

            state.setFontDescription(fontDescription);
        }
        return;
    }
// shorthand properties
    case CSSPropertyBackground:
        if (isInitial) {
            state.style()->clearBackgroundLayers();
            state.style()->setBackgroundColor(Color());
        } else if (isInherit) {
            state.style()->inheritBackgroundLayers(*state.parentStyle()->backgroundLayers());
            state.style()->setBackgroundColor(state.parentStyle()->backgroundColor());
        }
        return;
    case CSSPropertyWebkitMask:
        if (isInitial)
            state.style()->clearMaskLayers();
        else if (isInherit)
            state.style()->inheritMaskLayers(*state.parentStyle()->maskLayers());
        return;
    case CSSPropertyFont:
        if (isInherit) {
            FontDescription fontDescription = state.parentStyle()->fontDescription();
            state.style()->setLineHeight(state.parentStyle()->specifiedLineHeight());
            state.setLineHeightValue(0);
            state.setFontDescription(fontDescription);
        } else if (isInitial) {
            Settings* settings = documentSettings();
            ASSERT(settings); // If we're doing style resolution, this document should always be in a frame and thus have settings
            if (!settings)
                return;
            initializeFontStyle(state, settings);
        } else if (primitiveValue) {
            state.style()->setLineHeight(RenderStyle::initialLineHeight());
            state.setLineHeightValue(0);

            FontDescription fontDescription;
            RenderTheme::defaultTheme()->systemFont(primitiveValue->getIdent(), fontDescription);

            // Double-check and see if the theme did anything. If not, don't bother updating the font.
            if (fontDescription.isAbsoluteSize()) {
                // Make sure the rendering mode and printer font settings are updated.
                Settings* settings = documentSettings();
                ASSERT(settings); // If we're doing style resolution, this document should always be in a frame and thus have settings
                if (!settings)
                    return;
                fontDescription.setRenderingMode(settings->fontRenderingMode());
                fontDescription.setUsePrinterFont(document()->printing() || !settings->screenFontSubstitutionEnabled());

                // Handle the zoom factor.
                fontDescription.setComputedSize(getComputedSizeFromSpecifiedSize(document(), state.style(), fontDescription.isAbsoluteSize(), fontDescription.specifiedSize(), state.useSVGZoomRules()));
                state.setFontDescription(fontDescription);
            }
        } else if (value->isFontValue()) {
            FontValue* font = static_cast<FontValue*>(value);
            if (!font->style || !font->variant || !font->weight
                || !font->size || !font->lineHeight || !font->family)
                return;
            applyProperty(state, CSSPropertyFontStyle, font->style.get());
            applyProperty(state, CSSPropertyFontVariant, font->variant.get());
            applyProperty(state, CSSPropertyFontWeight, font->weight.get());
            // The previous properties can dirty our font but they don't try to read the font's
            // properties back, which is safe. However if font-size is using the 'ex' unit, it will
            // need query the dirtied font's x-height to get the computed size. To be safe in this
            // case, let's just update the font now.
            updateFont(state);
            applyProperty(state, CSSPropertyFontSize, font->size.get());

            state.setLineHeightValue(font->lineHeight.get());

            applyProperty(state, CSSPropertyFontFamily, font->family.get());
        }
        return;

    // CSS3 Properties
    case CSSPropertyTextShadow:
    case CSSPropertyBoxShadow:
    case CSSPropertyWebkitBoxShadow: {
        if (isInherit) {
            if (id == CSSPropertyTextShadow)
                return state.style()->setTextShadow(state.parentStyle()->textShadow() ? adoptPtr(new ShadowData(*state.parentStyle()->textShadow())) : nullptr);
            return state.style()->setBoxShadow(state.parentStyle()->boxShadow() ? adoptPtr(new ShadowData(*state.parentStyle()->boxShadow())) : nullptr);
        }
        if (isInitial || primitiveValue) // initial | none
            return id == CSSPropertyTextShadow ? state.style()->setTextShadow(nullptr) : state.style()->setBoxShadow(nullptr);

        if (!value->isValueList())
            return;

        for (CSSValueListIterator i = value; i.hasMore(); i.advance()) {
            CSSValue* currValue = i.value();
            if (!currValue->isShadowValue())
                continue;
            ShadowValue* item = static_cast<ShadowValue*>(currValue);
            int x = item->x->computeLength<int>(state.style(), state.rootElementStyle(), zoomFactor);
            int y = item->y->computeLength<int>(state.style(), state.rootElementStyle(), zoomFactor);
            int blur = item->blur ? item->blur->computeLength<int>(state.style(), state.rootElementStyle(), zoomFactor) : 0;
            int spread = item->spread ? item->spread->computeLength<int>(state.style(), state.rootElementStyle(), zoomFactor) : 0;
            ShadowStyle shadowStyle = item->style && item->style->getIdent() == CSSValueInset ? Inset : Normal;
            Color color;
            if (item->color)
                color = colorFromPrimitiveValue(state, item->color.get());
            else if (state.style())
                color = state.style()->color();

            OwnPtr<ShadowData> shadowData = adoptPtr(new ShadowData(IntPoint(x, y), blur, spread, shadowStyle, id == CSSPropertyWebkitBoxShadow, color.isValid() ? color : Color::transparent));
            if (id == CSSPropertyTextShadow)
                state.style()->setTextShadow(shadowData.release(), i.index()); // add to the list if this is not the first entry
            else
                state.style()->setBoxShadow(shadowData.release(), i.index()); // add to the list if this is not the first entry
        }
        return;
    }
    case CSSPropertyWebkitBoxReflect: {
        HANDLE_INHERIT_AND_INITIAL(boxReflect, BoxReflect)
        if (primitiveValue) {
            state.style()->setBoxReflect(RenderStyle::initialBoxReflect());
            return;
        }

        if (!value->isReflectValue())
            return;

        CSSReflectValue* reflectValue = static_cast<CSSReflectValue*>(value);
        RefPtr<StyleReflection> reflection = StyleReflection::create();
        reflection->setDirection(*reflectValue->direction());
        if (reflectValue->offset())
            reflection->setOffset(reflectValue->offset()->convertToLength<FixedIntegerConversion | PercentConversion | CalculatedConversion>(state.style(), state.rootElementStyle(), zoomFactor));
        NinePieceImage mask;
        mask.setMaskDefaults();
        CSSToStyleMap styleMap(state);
        styleMap.mapNinePieceImage(id, reflectValue->mask(), mask);
        reflection->setMask(mask);

        state.style()->setBoxReflect(reflection.release());
        return;
    }
    case CSSPropertySrc: // Only used in @font-face rules.
        return;
    case CSSPropertyUnicodeRange: // Only used in @font-face rules.
        return;
    case CSSPropertyWebkitColumnRule:
        if (isInherit) {
            state.style()->setColumnRuleColor(state.parentStyle()->columnRuleColor().isValid() ? state.parentStyle()->columnRuleColor() : state.parentStyle()->color());
            state.style()->setColumnRuleStyle(state.parentStyle()->columnRuleStyle());
            state.style()->setColumnRuleWidth(state.parentStyle()->columnRuleWidth());
        } else if (isInitial)
            state.style()->resetColumnRule();
        return;
    case CSSPropertyWebkitMarquee:
        if (!isInherit)
            return;
        state.style()->setMarqueeDirection(state.parentStyle()->marqueeDirection());
        state.style()->setMarqueeIncrement(state.parentStyle()->marqueeIncrement());
        state.style()->setMarqueeSpeed(state.parentStyle()->marqueeSpeed());
        state.style()->setMarqueeLoopCount(state.parentStyle()->marqueeLoopCount());
        state.style()->setMarqueeBehavior(state.parentStyle()->marqueeBehavior());
        return;
    case CSSPropertyWebkitMarqueeRepetition: {
        HANDLE_INHERIT_AND_INITIAL(marqueeLoopCount, MarqueeLoopCount)
        if (!primitiveValue)
            return;
        if (primitiveValue->getIdent() == CSSValueInfinite)
            state.style()->setMarqueeLoopCount(-1); // -1 means repeat forever.
        else if (primitiveValue->isNumber())
            state.style()->setMarqueeLoopCount(primitiveValue->getIntValue());
        return;
    }
    case CSSPropertyWebkitMarqueeSpeed: {
        HANDLE_INHERIT_AND_INITIAL(marqueeSpeed, MarqueeSpeed)
        if (!primitiveValue)
            return;
        if (int ident = primitiveValue->getIdent()) {
            switch (ident) {
            case CSSValueSlow:
                state.style()->setMarqueeSpeed(500); // 500 msec.
                break;
            case CSSValueNormal:
                state.style()->setMarqueeSpeed(85); // 85msec. The WinIE default.
                break;
            case CSSValueFast:
                state.style()->setMarqueeSpeed(10); // 10msec. Super fast.
                break;
            }
        } else if (primitiveValue->isTime())
            state.style()->setMarqueeSpeed(primitiveValue->computeTime<int, CSSPrimitiveValue::Milliseconds>());
        else if (primitiveValue->isNumber()) // For scrollamount support.
            state.style()->setMarqueeSpeed(primitiveValue->getIntValue());
        return;
    }
    case CSSPropertyWebkitMarqueeIncrement: {
        HANDLE_INHERIT_AND_INITIAL(marqueeIncrement, MarqueeIncrement)
        if (!primitiveValue)
            return;
        if (primitiveValue->getIdent()) {
            switch (primitiveValue->getIdent()) {
            case CSSValueSmall:
                state.style()->setMarqueeIncrement(Length(1, Fixed)); // 1px.
                break;
            case CSSValueNormal:
                state.style()->setMarqueeIncrement(Length(6, Fixed)); // 6px. The WinIE default.
                break;
            case CSSValueLarge:
                state.style()->setMarqueeIncrement(Length(36, Fixed)); // 36px.
                break;
            }
        } else {
            Length marqueeLength = convertToIntLength(primitiveValue, state.style(), state.rootElementStyle());
            if (!marqueeLength.isUndefined())
                state.style()->setMarqueeIncrement(marqueeLength);
        }
        return;
    }
    case CSSPropertyWebkitLocale: {
        HANDLE_INHERIT_AND_INITIAL(locale, Locale);
        if (!primitiveValue)
            return;
        if (primitiveValue->getIdent() == CSSValueAuto)
            state.style()->setLocale(nullAtom);
        else
            state.style()->setLocale(primitiveValue->getStringValue());
        FontDescription fontDescription = state.style()->fontDescription();
        fontDescription.setScript(localeToScriptCodeForFontSelection(state.style()->locale()));
        state.setFontDescription(fontDescription);
        return;
    }
    case CSSPropertyWebkitTextSizeAdjust: {
        HANDLE_INHERIT_AND_INITIAL(textSizeAdjust, TextSizeAdjust)
        if (!primitiveValue || !primitiveValue->getIdent())
            return;
        state.setTextSizeAdjust(primitiveValue->getIdent() == CSSValueAuto);
        return;
    }
#if ENABLE(DASHBOARD_SUPPORT)
    case CSSPropertyWebkitDashboardRegion:
    {
        HANDLE_INHERIT_AND_INITIAL(dashboardRegions, DashboardRegions)
        if (!primitiveValue)
            return;

        if (primitiveValue->getIdent() == CSSValueNone) {
            state.style()->setDashboardRegions(RenderStyle::noneDashboardRegions());
            return;
        }

        DashboardRegion* region = primitiveValue->getDashboardRegionValue();
        if (!region)
            return;

        DashboardRegion* first = region;
        while (region) {
            Length top = convertToIntLength(region->top(), state.style(), state.rootElementStyle());
            Length right = convertToIntLength(region->right(), state.style(), state.rootElementStyle());
            Length bottom = convertToIntLength(region->bottom(), state.style(), state.rootElementStyle());
            Length left = convertToIntLength(region->left(), state.style(), state.rootElementStyle());

            if (top.isUndefined())
                top = Length();
            if (right.isUndefined())
                right = Length();
            if (bottom.isUndefined())
                bottom = Length();
            if (left.isUndefined())
                left = Length();

            if (region->m_isCircle)
                state.style()->setDashboardRegion(StyleDashboardRegion::Circle, region->m_label, top, right, bottom, left, region == first ? false : true);
            else if (region->m_isRectangle)
                state.style()->setDashboardRegion(StyleDashboardRegion::Rectangle, region->m_label, top, right, bottom, left, region == first ? false : true);
            region = region->m_next.get();
        }

        state.document()->setHasAnnotatedRegions(true);

        return;
    }
#endif
#if ENABLE(DRAGGABLE_REGION)
    case CSSPropertyWebkitAppRegion: {
        if (!primitiveValue || !primitiveValue->getIdent())
            return;
        state.style()->setDraggableRegionMode(primitiveValue->getIdent() == CSSValueDrag ? DraggableRegionDrag : DraggableRegionNoDrag);
        state.document()->setHasAnnotatedRegions(true);
        return;
    }
#endif
    case CSSPropertyWebkitTextStrokeWidth: {
        HANDLE_INHERIT_AND_INITIAL(textStrokeWidth, TextStrokeWidth)
        float width = 0;
        switch (primitiveValue->getIdent()) {
        case CSSValueThin:
        case CSSValueMedium:
        case CSSValueThick: {
            double result = 1.0 / 48;
            if (primitiveValue->getIdent() == CSSValueMedium)
                result *= 3;
            else if (primitiveValue->getIdent() == CSSValueThick)
                result *= 5;
            width = CSSPrimitiveValue::create(result, CSSPrimitiveValue::CSS_EMS)->computeLength<float>(state.style(), state.rootElementStyle(), zoomFactor);
            break;
        }
        default:
            width = primitiveValue->computeLength<float>(state.style(), state.rootElementStyle(), zoomFactor);
            break;
        }
        state.style()->setTextStrokeWidth(width);
        return;
    }
    case CSSPropertyWebkitTransform: {
        HANDLE_INHERIT_AND_INITIAL(transform, Transform);
        TransformOperations operations;
        createTransformOperations(value, state.style(), state.rootElementStyle(), operations);
        state.style()->setTransform(operations);
        return;
    }
    case CSSPropertyWebkitPerspective: {
        HANDLE_INHERIT_AND_INITIAL(perspective, Perspective)

        if (!primitiveValue)
            return;

        if (primitiveValue->getIdent() == CSSValueNone) {
            state.style()->setPerspective(0);
            return;
        }

        float perspectiveValue;
        if (primitiveValue->isLength())
            perspectiveValue = primitiveValue->computeLength<float>(state.style(), state.rootElementStyle(), zoomFactor);
        else if (primitiveValue->isNumber()) {
            // For backward compatibility, treat valueless numbers as px.
            perspectiveValue = CSSPrimitiveValue::create(primitiveValue->getDoubleValue(), CSSPrimitiveValue::CSS_PX)->computeLength<float>(state.style(), state.rootElementStyle(), zoomFactor);
        } else
            return;

        if (perspectiveValue >= 0.0f)
            state.style()->setPerspective(perspectiveValue);
        return;
    }
    case CSSPropertyWebkitAnimation:
        if (isInitial)
            state.style()->clearAnimations();
        else if (isInherit)
            state.style()->inheritAnimations(state.parentStyle()->animations());
        return;
    case CSSPropertyWebkitTransition:
        if (isInitial)
            state.style()->clearTransitions();
        else if (isInherit)
            state.style()->inheritTransitions(state.parentStyle()->transitions());
        return;
#if ENABLE(TOUCH_EVENTS)
    case CSSPropertyWebkitTapHighlightColor: {
        HANDLE_INHERIT_AND_INITIAL(tapHighlightColor, TapHighlightColor);
        if (!primitiveValue)
            break;

        Color col = colorFromPrimitiveValue(state, primitiveValue);
        state.style()->setTapHighlightColor(col);
        return;
    }
#endif
#if ENABLE(ACCELERATED_OVERFLOW_SCROLLING)
    case CSSPropertyWebkitOverflowScrolling: {
        HANDLE_INHERIT_AND_INITIAL(useTouchOverflowScrolling, UseTouchOverflowScrolling);
        if (!primitiveValue)
            break;
        state.style()->setUseTouchOverflowScrolling(primitiveValue->getIdent() == CSSValueTouch);
        return;
    }
#endif
    case CSSPropertyInvalid:
        return;
    // Directional properties are resolved by resolveDirectionAwareProperty() before the switch.
    case CSSPropertyWebkitBorderEnd:
    case CSSPropertyWebkitBorderEndColor:
    case CSSPropertyWebkitBorderEndStyle:
    case CSSPropertyWebkitBorderEndWidth:
    case CSSPropertyWebkitBorderStart:
    case CSSPropertyWebkitBorderStartColor:
    case CSSPropertyWebkitBorderStartStyle:
    case CSSPropertyWebkitBorderStartWidth:
    case CSSPropertyWebkitBorderBefore:
    case CSSPropertyWebkitBorderBeforeColor:
    case CSSPropertyWebkitBorderBeforeStyle:
    case CSSPropertyWebkitBorderBeforeWidth:
    case CSSPropertyWebkitBorderAfter:
    case CSSPropertyWebkitBorderAfterColor:
    case CSSPropertyWebkitBorderAfterStyle:
    case CSSPropertyWebkitBorderAfterWidth:
    case CSSPropertyWebkitMarginEnd:
    case CSSPropertyWebkitMarginStart:
    case CSSPropertyWebkitMarginBefore:
    case CSSPropertyWebkitMarginAfter:
    case CSSPropertyWebkitMarginCollapse:
    case CSSPropertyWebkitMarginBeforeCollapse:
    case CSSPropertyWebkitMarginTopCollapse:
    case CSSPropertyWebkitMarginAfterCollapse:
    case CSSPropertyWebkitMarginBottomCollapse:
    case CSSPropertyWebkitPaddingEnd:
    case CSSPropertyWebkitPaddingStart:
    case CSSPropertyWebkitPaddingBefore:
    case CSSPropertyWebkitPaddingAfter:
    case CSSPropertyWebkitLogicalWidth:
    case CSSPropertyWebkitLogicalHeight:
    case CSSPropertyWebkitMinLogicalWidth:
    case CSSPropertyWebkitMinLogicalHeight:
    case CSSPropertyWebkitMaxLogicalWidth:
    case CSSPropertyWebkitMaxLogicalHeight:
    {
        CSSPropertyID newId = CSSProperty::resolveDirectionAwareProperty(id, state.style()->direction(), state.style()->writingMode());
        ASSERT(newId != id);
        return applyProperty(state, newId, value);
    }
    case CSSPropertyFontStretch:
    case CSSPropertyPage:
    case CSSPropertyTextLineThrough:
    case CSSPropertyTextLineThroughColor:
    case CSSPropertyTextLineThroughMode:
    case CSSPropertyTextLineThroughStyle:
    case CSSPropertyTextLineThroughWidth:
    case CSSPropertyTextOverline:
    case CSSPropertyTextOverlineColor:
    case CSSPropertyTextOverlineMode:
    case CSSPropertyTextOverlineStyle:
    case CSSPropertyTextOverlineWidth:
    case CSSPropertyTextUnderline:
    case CSSPropertyTextUnderlineColor:
    case CSSPropertyTextUnderlineMode:
    case CSSPropertyTextUnderlineStyle:
    case CSSPropertyTextUnderlineWidth:
    case CSSPropertyWebkitFontSizeDelta:
    case CSSPropertyWebkitTextDecorationsInEffect:
    case CSSPropertyWebkitTextStroke:
    case CSSPropertyWebkitTextEmphasis:
        return;

    // CSS Text Layout Module Level 3: Vertical writing support
    case CSSPropertyWebkitWritingMode: {
        HANDLE_INHERIT_AND_INITIAL(writingMode, WritingMode);
        
        if (primitiveValue)
            state.setWritingMode(*primitiveValue);

        // FIXME: It is not ok to modify document state while applying style.
        if (state.element() && state.element() == state.document()->documentElement())
            state.document()->setWritingModeSetOnDocumentElement(true);
        return;
    }

    case CSSPropertyWebkitTextOrientation: {
        HANDLE_INHERIT_AND_INITIAL(textOrientation, TextOrientation);

        if (primitiveValue)
            state.setTextOrientation(*primitiveValue);

        return;
    }

    case CSSPropertyWebkitLineBoxContain: {
        HANDLE_INHERIT_AND_INITIAL(lineBoxContain, LineBoxContain)
        if (primitiveValue && primitiveValue->getIdent() == CSSValueNone) {
            state.style()->setLineBoxContain(LineBoxContainNone);
            return;
        }

        if (!value->isCSSLineBoxContainValue())
            return;

        CSSLineBoxContainValue* lineBoxContainValue = static_cast<CSSLineBoxContainValue*>(value);
        state.style()->setLineBoxContain(lineBoxContainValue->value());
        return;
    }

    // CSS Fonts Module Level 3
    case CSSPropertyWebkitFontFeatureSettings: {
        if (primitiveValue && primitiveValue->getIdent() == CSSValueNormal) {
            state.setFontDescription(state.style()->fontDescription().makeNormalFeatureSettings());
            return;
        }

        if (!value->isValueList())
            return;

        FontDescription fontDescription = state.style()->fontDescription();
        CSSValueList* list = static_cast<CSSValueList*>(value);
        RefPtr<FontFeatureSettings> settings = FontFeatureSettings::create();
        int len = list->length();
        for (int i = 0; i < len; ++i) {
            CSSValue* item = list->itemWithoutBoundsCheck(i);
            if (!item->isFontFeatureValue())
                continue;
            FontFeatureValue* feature = static_cast<FontFeatureValue*>(item);
            settings->append(FontFeature(feature->tag(), feature->value()));
        }
        fontDescription.setFeatureSettings(settings.release());
        state.setFontDescription(fontDescription);
        return;
    }

#if ENABLE(CSS_FILTERS)
    case CSSPropertyWebkitFilter: {
        HANDLE_INHERIT_AND_INITIAL(filter, Filter);
        FilterOperations operations;
        if (createFilterOperations(state, value, state.style(), state.rootElementStyle(), operations))
            state.style()->setFilter(operations);
        return;
    }
#endif
    case CSSPropertyWebkitGridColumns: {
        Vector<GridTrackSize> trackSizes;
        if (!createGridTrackList(value, trackSizes, state))
            return;
        state.style()->setGridColumns(trackSizes);
        return;
    }
    case CSSPropertyWebkitGridRows: {
        Vector<GridTrackSize> trackSizes;
        if (!createGridTrackList(value, trackSizes, state))
            return;
        state.style()->setGridRows(trackSizes);
        return;
    }

    case CSSPropertyWebkitGridColumn: {
        GridPosition column;
        if (!createGridPosition(value, column))
            return;
        state.style()->setGridItemColumn(column);
        return;
    }
    case CSSPropertyWebkitGridRow: {
        GridPosition row;
        if (!createGridPosition(value, row))
            return;
        state.style()->setGridItemRow(row);
        return;
    }
    // These properties are implemented in the StyleBuilder lookup table.
    case CSSPropertyBackgroundAttachment:
    case CSSPropertyBackgroundClip:
    case CSSPropertyBackgroundColor:
    case CSSPropertyBackgroundImage:
    case CSSPropertyBackgroundOrigin:
    case CSSPropertyBackgroundPosition:
    case CSSPropertyBackgroundPositionX:
    case CSSPropertyBackgroundPositionY:
    case CSSPropertyBackgroundRepeat:
    case CSSPropertyBackgroundRepeatX:
    case CSSPropertyBackgroundRepeatY:
    case CSSPropertyBackgroundSize:
    case CSSPropertyBorder:
    case CSSPropertyBorderBottom:
    case CSSPropertyBorderBottomColor:
    case CSSPropertyBorderBottomLeftRadius:
    case CSSPropertyBorderBottomRightRadius:
    case CSSPropertyBorderBottomStyle:
    case CSSPropertyBorderBottomWidth:
    case CSSPropertyBorderCollapse:
    case CSSPropertyBorderColor:
    case CSSPropertyBorderImage:
    case CSSPropertyBorderImageOutset:
    case CSSPropertyBorderImageRepeat:
    case CSSPropertyBorderImageSlice:
    case CSSPropertyBorderImageSource:
    case CSSPropertyBorderImageWidth:
    case CSSPropertyBorderLeft:
    case CSSPropertyBorderLeftColor:
    case CSSPropertyBorderLeftStyle:
    case CSSPropertyBorderLeftWidth:
    case CSSPropertyBorderRadius:
    case CSSPropertyBorderRight:
    case CSSPropertyBorderRightColor:
    case CSSPropertyBorderRightStyle:
    case CSSPropertyBorderRightWidth:
    case CSSPropertyBorderSpacing:
    case CSSPropertyBorderStyle:
    case CSSPropertyBorderTop:
    case CSSPropertyBorderTopColor:
    case CSSPropertyBorderTopLeftRadius:
    case CSSPropertyBorderTopRightRadius:
    case CSSPropertyBorderTopStyle:
    case CSSPropertyBorderTopWidth:
    case CSSPropertyBorderWidth:
    case CSSPropertyBottom:
    case CSSPropertyBoxSizing:
    case CSSPropertyCaptionSide:
    case CSSPropertyClear:
    case CSSPropertyClip:
    case CSSPropertyColor:
    case CSSPropertyCounterIncrement:
    case CSSPropertyCounterReset:
    case CSSPropertyCursor:
    case CSSPropertyDirection:
    case CSSPropertyDisplay:
    case CSSPropertyEmptyCells:
    case CSSPropertyFloat:
    case CSSPropertyFontSize:
    case CSSPropertyFontStyle:
    case CSSPropertyFontVariant:
    case CSSPropertyFontWeight:
    case CSSPropertyHeight:
#if ENABLE(CSS_IMAGE_ORIENTATION)
    case CSSPropertyImageOrientation:
#endif
    case CSSPropertyImageRendering:
#if ENABLE(CSS_IMAGE_RESOLUTION)
    case CSSPropertyImageResolution:
#endif
    case CSSPropertyLeft:
    case CSSPropertyLetterSpacing:
    case CSSPropertyLineHeight:
    case CSSPropertyListStyle:
    case CSSPropertyListStyleImage:
    case CSSPropertyListStylePosition:
    case CSSPropertyListStyleType:
    case CSSPropertyMargin:
    case CSSPropertyMarginBottom:
    case CSSPropertyMarginLeft:
    case CSSPropertyMarginRight:
    case CSSPropertyMarginTop:
    case CSSPropertyMaxHeight:
    case CSSPropertyMaxWidth:
    case CSSPropertyMinHeight:
    case CSSPropertyMinWidth:
    case CSSPropertyOpacity:
    case CSSPropertyOrphans:
    case CSSPropertyOutline:
    case CSSPropertyOutlineColor:
    case CSSPropertyOutlineOffset:
    case CSSPropertyOutlineStyle:
    case CSSPropertyOutlineWidth:
    case CSSPropertyOverflow:
    case CSSPropertyOverflowWrap:
    case CSSPropertyOverflowX:
    case CSSPropertyOverflowY:
    case CSSPropertyPadding:
    case CSSPropertyPaddingBottom:
    case CSSPropertyPaddingLeft:
    case CSSPropertyPaddingRight:
    case CSSPropertyPaddingTop:
    case CSSPropertyPageBreakAfter:
    case CSSPropertyPageBreakBefore:
    case CSSPropertyPageBreakInside:
    case CSSPropertyPointerEvents:
    case CSSPropertyPosition:
    case CSSPropertyResize:
    case CSSPropertyRight:
    case CSSPropertySize:
    case CSSPropertySpeak:
    case CSSPropertyTabSize:
    case CSSPropertyTableLayout:
    case CSSPropertyTextAlign:
    case CSSPropertyTextDecoration:
    case CSSPropertyTextIndent:
    case CSSPropertyTextOverflow:
    case CSSPropertyTextRendering:
    case CSSPropertyTextTransform:
    case CSSPropertyTop:
    case CSSPropertyUnicodeBidi:
#if ENABLE(CSS_VARIABLES)
    case CSSPropertyVariable:
#endif
    case CSSPropertyVerticalAlign:
    case CSSPropertyVisibility:
    case CSSPropertyWebkitAnimationDelay:
    case CSSPropertyWebkitAnimationDirection:
    case CSSPropertyWebkitAnimationDuration:
    case CSSPropertyWebkitAnimationFillMode:
    case CSSPropertyWebkitAnimationIterationCount:
    case CSSPropertyWebkitAnimationName:
    case CSSPropertyWebkitAnimationPlayState:
    case CSSPropertyWebkitAnimationTimingFunction:
    case CSSPropertyWebkitAppearance:
    case CSSPropertyWebkitAspectRatio:
    case CSSPropertyWebkitBackfaceVisibility:
    case CSSPropertyWebkitBackgroundClip:
    case CSSPropertyWebkitBackgroundComposite:
    case CSSPropertyWebkitBackgroundOrigin:
    case CSSPropertyWebkitBackgroundSize:
    case CSSPropertyWebkitBorderFit:
    case CSSPropertyWebkitBorderHorizontalSpacing:
    case CSSPropertyWebkitBorderImage:
    case CSSPropertyWebkitBorderRadius:
    case CSSPropertyWebkitBorderVerticalSpacing:
    case CSSPropertyWebkitBoxAlign:
#if ENABLE(CSS_BOX_DECORATION_BREAK)
    case CSSPropertyWebkitBoxDecorationBreak:
#endif
    case CSSPropertyWebkitBoxDirection:
    case CSSPropertyWebkitBoxFlex:
    case CSSPropertyWebkitBoxFlexGroup:
    case CSSPropertyWebkitBoxLines:
    case CSSPropertyWebkitBoxOrdinalGroup:
    case CSSPropertyWebkitBoxOrient:
    case CSSPropertyWebkitBoxPack:
    case CSSPropertyWebkitColorCorrection:
    case CSSPropertyWebkitColumnAxis:
    case CSSPropertyWebkitColumnBreakAfter:
    case CSSPropertyWebkitColumnBreakBefore:
    case CSSPropertyWebkitColumnBreakInside:
    case CSSPropertyWebkitColumnCount:
    case CSSPropertyWebkitColumnGap:
    case CSSPropertyWebkitColumnProgression:
    case CSSPropertyWebkitColumnRuleColor:
    case CSSPropertyWebkitColumnRuleStyle:
    case CSSPropertyWebkitColumnRuleWidth:
    case CSSPropertyWebkitColumns:
    case CSSPropertyWebkitColumnSpan:
    case CSSPropertyWebkitColumnWidth:
    case CSSPropertyWebkitAlignContent:
    case CSSPropertyWebkitAlignItems:
    case CSSPropertyWebkitAlignSelf:
    case CSSPropertyWebkitFlex:
    case CSSPropertyWebkitFlexBasis:
    case CSSPropertyWebkitFlexDirection:
    case CSSPropertyWebkitFlexFlow:
    case CSSPropertyWebkitFlexGrow:
    case CSSPropertyWebkitFlexShrink:
    case CSSPropertyWebkitFlexWrap:
    case CSSPropertyWebkitJustifyContent:
    case CSSPropertyWebkitOrder:
#if ENABLE(CSS_REGIONS)
    case CSSPropertyWebkitFlowFrom:
    case CSSPropertyWebkitFlowInto:
#endif
    case CSSPropertyWebkitFontKerning:
    case CSSPropertyWebkitFontSmoothing:
    case CSSPropertyWebkitFontVariantLigatures:
    case CSSPropertyWebkitHighlight:
    case CSSPropertyWebkitHyphenateCharacter:
    case CSSPropertyWebkitHyphenateLimitAfter:
    case CSSPropertyWebkitHyphenateLimitBefore:
    case CSSPropertyWebkitHyphenateLimitLines:
    case CSSPropertyWebkitHyphens:
    case CSSPropertyWebkitLineAlign:
    case CSSPropertyWebkitLineBreak:
    case CSSPropertyWebkitLineClamp:
    case CSSPropertyWebkitLineGrid:
    case CSSPropertyWebkitLineSnap:
    case CSSPropertyWebkitMarqueeDirection:
    case CSSPropertyWebkitMarqueeStyle:
    case CSSPropertyWebkitMaskBoxImage:
    case CSSPropertyWebkitMaskBoxImageOutset:
    case CSSPropertyWebkitMaskBoxImageRepeat:
    case CSSPropertyWebkitMaskBoxImageSlice:
    case CSSPropertyWebkitMaskBoxImageSource:
    case CSSPropertyWebkitMaskBoxImageWidth:
    case CSSPropertyWebkitMaskClip:
    case CSSPropertyWebkitMaskComposite:
    case CSSPropertyWebkitMaskImage:
    case CSSPropertyWebkitMaskOrigin:
    case CSSPropertyWebkitMaskPosition:
    case CSSPropertyWebkitMaskPositionX:
    case CSSPropertyWebkitMaskPositionY:
    case CSSPropertyWebkitMaskRepeat:
    case CSSPropertyWebkitMaskRepeatX:
    case CSSPropertyWebkitMaskRepeatY:
    case CSSPropertyWebkitMaskSize:
    case CSSPropertyWebkitNbspMode:
    case CSSPropertyWebkitPerspectiveOrigin:
    case CSSPropertyWebkitPerspectiveOriginX:
    case CSSPropertyWebkitPerspectiveOriginY:
    case CSSPropertyWebkitPrintColorAdjust:
#if ENABLE(CSS_REGIONS)
    case CSSPropertyWebkitRegionBreakAfter:
    case CSSPropertyWebkitRegionBreakBefore:
    case CSSPropertyWebkitRegionBreakInside:
    case CSSPropertyWebkitRegionOverflow:
#endif
    case CSSPropertyWebkitRtlOrdering:
    case CSSPropertyWebkitRubyPosition:
    case CSSPropertyWebkitTextCombine:
#if ENABLE(CSS3_TEXT)
    case CSSPropertyWebkitTextDecorationLine:
    case CSSPropertyWebkitTextDecorationStyle:
    case CSSPropertyWebkitTextAlignLast:
#endif // CSS3_TEXT
    case CSSPropertyWebkitTextEmphasisColor:
    case CSSPropertyWebkitTextEmphasisPosition:
    case CSSPropertyWebkitTextEmphasisStyle:
    case CSSPropertyWebkitTextFillColor:
    case CSSPropertyWebkitTextSecurity:
    case CSSPropertyWebkitTextStrokeColor:
    case CSSPropertyWebkitTransformOrigin:
    case CSSPropertyWebkitTransformOriginX:
    case CSSPropertyWebkitTransformOriginY:
    case CSSPropertyWebkitTransformOriginZ:
    case CSSPropertyWebkitTransformStyle:
    case CSSPropertyWebkitTransitionDelay:
    case CSSPropertyWebkitTransitionDuration:
    case CSSPropertyWebkitTransitionProperty:
    case CSSPropertyWebkitTransitionTimingFunction:
    case CSSPropertyWebkitUserDrag:
    case CSSPropertyWebkitUserModify:
    case CSSPropertyWebkitUserSelect:
    case CSSPropertyWebkitClipPath:
#if ENABLE(CSS_EXCLUSIONS)
    case CSSPropertyWebkitWrap:
    case CSSPropertyWebkitWrapFlow:
    case CSSPropertyWebkitShapeMargin:
    case CSSPropertyWebkitShapePadding:
    case CSSPropertyWebkitWrapThrough:
    case CSSPropertyWebkitShapeInside:
    case CSSPropertyWebkitShapeOutside:
#endif
    case CSSPropertyWhiteSpace:
    case CSSPropertyWidows:
    case CSSPropertyWidth:
    case CSSPropertyWordBreak:
    case CSSPropertyWordSpacing:
    case CSSPropertyWordWrap:
    case CSSPropertyZIndex:
    case CSSPropertyZoom:
#if ENABLE(CSS_DEVICE_ADAPTATION)
    case CSSPropertyMaxZoom:
    case CSSPropertyMinZoom:
    case CSSPropertyOrientation:
    case CSSPropertyUserZoom:
#endif
        ASSERT_NOT_REACHED();
        return;
    default:
#if ENABLE(SVG)
        // Try the SVG properties
        applySVGProperty(state, id, value);
#endif
        return;
    }
}

PassRefPtr<StyleImage> StyleResolver::styleImage(State& state, CSSPropertyID property, CSSValue* value)
{
    if (value->isImageValue())
        return cachedOrPendingFromValue(state, property, static_cast<CSSImageValue*>(value));

    if (value->isImageGeneratorValue()) {
        if (value->isGradientValue())
            return generatedOrPendingFromValue(state, property, static_cast<CSSGradientValue*>(value)->gradientWithStylesResolved(state).get());
        return generatedOrPendingFromValue(state, property, static_cast<CSSImageGeneratorValue*>(value));
    }

#if ENABLE(CSS_IMAGE_SET)
    if (value->isImageSetValue())
        return setOrPendingFromValue(state, property, static_cast<CSSImageSetValue*>(value));
#endif

    if (value->isCursorImageValue())
        return cursorOrPendingFromValue(state, property, static_cast<CSSCursorImageValue*>(value));

    return 0;
}

PassRefPtr<StyleImage> StyleResolver::cachedOrPendingFromValue(State& state, CSSPropertyID property, CSSImageValue* value)
{
    RefPtr<StyleImage> image = value->cachedOrPendingImage();
    if (image && image->isPendingImage())
        state.pendingImageProperties().set(property, value);
    return image.release();
}

PassRefPtr<StyleImage> StyleResolver::generatedOrPendingFromValue(State& state, CSSPropertyID property, CSSImageGeneratorValue* value)
{
    if (value->isPending()) {
        state.pendingImageProperties().set(property, value);
        return StylePendingImage::create(value);
    }
    return StyleGeneratedImage::create(value);
}

#if ENABLE(CSS_IMAGE_SET)
PassRefPtr<StyleImage> StyleResolver::setOrPendingFromValue(State& state, CSSPropertyID property, CSSImageSetValue* value)
{
    RefPtr<StyleImage> image = value->cachedOrPendingImageSet(state.document());
    if (image && image->isPendingImage())
        state.pendingImageProperties().set(property, value);
    return image.release();
}
#endif

PassRefPtr<StyleImage> StyleResolver::cursorOrPendingFromValue(State& state, CSSPropertyID property, CSSCursorImageValue* value)
{
    RefPtr<StyleImage> image = value->cachedOrPendingImage(state.document());
    if (image && image->isPendingImage())
        state.pendingImageProperties().set(property, value);
    return image.release();
}

void StyleResolver::checkForTextSizeAdjust(State& state)
{
    RenderStyle* style = state.style();

    if (style->textSizeAdjust())
        return;

    FontDescription newFontDescription(style->fontDescription());
    newFontDescription.setComputedSize(newFontDescription.specifiedSize());
    style->setFontDescription(newFontDescription);
}

void StyleResolver::checkForZoomChange(State& state, RenderStyle* style, RenderStyle* parentStyle)
{
    if (style->effectiveZoom() == parentStyle->effectiveZoom())
        return;

    const FontDescription& childFont = style->fontDescription();
    FontDescription newFontDescription(childFont);
    setFontSize(state, newFontDescription, childFont.specifiedSize());
    style->setFontDescription(newFontDescription);
}

void StyleResolver::checkForGenericFamilyChange(State& state, RenderStyle* style, RenderStyle* parentStyle)
{
    const FontDescription& childFont = style->fontDescription();

    if (childFont.isAbsoluteSize() || !parentStyle)
        return;

    const FontDescription& parentFont = parentStyle->fontDescription();
    if (childFont.useFixedDefaultSize() == parentFont.useFixedDefaultSize())
        return;

    // For now, lump all families but monospace together.
    if (childFont.genericFamily() != FontDescription::MonospaceFamily
        && parentFont.genericFamily() != FontDescription::MonospaceFamily)
        return;

    // We know the parent is monospace or the child is monospace, and that font
    // size was unspecified. We want to scale our font size as appropriate.
    // If the font uses a keyword size, then we refetch from the table rather than
    // multiplying by our scale factor.
    float size;
    if (childFont.keywordSize())
        size = fontSizeForKeyword(document(), CSSValueXxSmall + childFont.keywordSize() - 1, childFont.useFixedDefaultSize());
    else {
        Settings* settings = documentSettings();
        float fixedScaleFactor = (settings && settings->defaultFixedFontSize() && settings->defaultFontSize())
            ? static_cast<float>(settings->defaultFixedFontSize()) / settings->defaultFontSize()
            : 1;
        size = parentFont.useFixedDefaultSize() ?
                childFont.specifiedSize() / fixedScaleFactor :
                childFont.specifiedSize() * fixedScaleFactor;
    }

    FontDescription newFontDescription(childFont);
    setFontSize(state, newFontDescription, size);
    style->setFontDescription(newFontDescription);
}

void StyleResolver::initializeFontStyle(State& state, Settings* settings)
{
    FontDescription fontDescription;
    fontDescription.setGenericFamily(FontDescription::StandardFamily);
    fontDescription.setRenderingMode(settings->fontRenderingMode());
    fontDescription.setUsePrinterFont(document()->printing() || !settings->screenFontSubstitutionEnabled());
    const AtomicString& standardFontFamily = documentSettings()->standardFontFamily();
    if (!standardFontFamily.isEmpty()) {
        fontDescription.firstFamily().setFamily(standardFontFamily);
        fontDescription.firstFamily().appendFamily(0);
    }
    fontDescription.setKeywordSize(CSSValueMedium - CSSValueXxSmall + 1);
    setFontSize(state, fontDescription, fontSizeForKeyword(document(), CSSValueMedium, false));
    state.style()->setLineHeight(RenderStyle::initialLineHeight());
    state.setLineHeightValue(0);
    state.setFontDescription(fontDescription);
}

void StyleResolver::setFontSize(State& state, FontDescription& fontDescription, float size)
{
    fontDescription.setSpecifiedSize(size);
    fontDescription.setComputedSize(getComputedSizeFromSpecifiedSize(state.document(), state.style(), fontDescription.isAbsoluteSize(), size, state.useSVGZoomRules()));
}

float StyleResolver::getComputedSizeFromSpecifiedSize(Document* document, RenderStyle* style, bool isAbsoluteSize, float specifiedSize, bool useSVGZoomRules)
{
    float zoomFactor = 1.0f;
    if (!useSVGZoomRules) {
        zoomFactor = style->effectiveZoom();
        if (Frame* frame = document->frame())
            zoomFactor *= frame->textZoomFactor();
    }

    return StyleResolver::getComputedSizeFromSpecifiedSize(document, zoomFactor, isAbsoluteSize, specifiedSize);
}

float StyleResolver::getComputedSizeFromSpecifiedSize(Document* document, float zoomFactor, bool isAbsoluteSize, float specifiedSize, ESmartMinimumForFontSize useSmartMinimumForFontSize)
{
    // Text with a 0px font size should not be visible and therefore needs to be
    // exempt from minimum font size rules. Acid3 relies on this for pixel-perfect
    // rendering. This is also compatible with other browsers that have minimum
    // font size settings (e.g. Firefox).
    if (fabsf(specifiedSize) < std::numeric_limits<float>::epsilon())
        return 0.0f;

    // We support two types of minimum font size. The first is a hard override that applies to
    // all fonts. This is "minSize." The second type of minimum font size is a "smart minimum"
    // that is applied only when the Web page can't know what size it really asked for, e.g.,
    // when it uses logical sizes like "small" or expresses the font-size as a percentage of
    // the user's default font setting.

    // With the smart minimum, we never want to get smaller than the minimum font size to keep fonts readable.
    // However we always allow the page to set an explicit pixel size that is smaller,
    // since sites will mis-render otherwise (e.g., http://www.gamespot.com with a 9px minimum).

    Settings* settings = document->settings();
    if (!settings)
        return 1.0f;

    int minSize = settings->minimumFontSize();
    int minLogicalSize = settings->minimumLogicalFontSize();
    float zoomedSize = specifiedSize * zoomFactor;

    // Apply the hard minimum first. We only apply the hard minimum if after zooming we're still too small.
    if (zoomedSize < minSize)
        zoomedSize = minSize;

    // Now apply the "smart minimum." This minimum is also only applied if we're still too small
    // after zooming. The font size must either be relative to the user default or the original size
    // must have been acceptable. In other words, we only apply the smart minimum whenever we're positive
    // doing so won't disrupt the layout.
    if (useSmartMinimumForFontSize && zoomedSize < minLogicalSize && (specifiedSize >= minLogicalSize || !isAbsoluteSize))
        zoomedSize = minLogicalSize;

    // Also clamp to a reasonable maximum to prevent insane font sizes from causing crashes on various
    // platforms (I'm looking at you, Windows.)
    return min(maximumAllowedFontSize, zoomedSize);
}

const int fontSizeTableMax = 16;
const int fontSizeTableMin = 9;
const int totalKeywords = 8;

// WinIE/Nav4 table for font sizes. Designed to match the legacy font mapping system of HTML.
static const int quirksFontSizeTable[fontSizeTableMax - fontSizeTableMin + 1][totalKeywords] =
{
      { 9,    9,     9,     9,    11,    14,    18,    28 },
      { 9,    9,     9,    10,    12,    15,    20,    31 },
      { 9,    9,     9,    11,    13,    17,    22,    34 },
      { 9,    9,    10,    12,    14,    18,    24,    37 },
      { 9,    9,    10,    13,    16,    20,    26,    40 }, // fixed font default (13)
      { 9,    9,    11,    14,    17,    21,    28,    42 },
      { 9,   10,    12,    15,    17,    23,    30,    45 },
      { 9,   10,    13,    16,    18,    24,    32,    48 } // proportional font default (16)
};
// HTML       1      2      3      4      5      6      7
// CSS  xxs   xs     s      m      l     xl     xxl
//                          |
//                      user pref

// Strict mode table matches MacIE and Mozilla's settings exactly.
static const int strictFontSizeTable[fontSizeTableMax - fontSizeTableMin + 1][totalKeywords] =
{
      { 9,    9,     9,     9,    11,    14,    18,    27 },
      { 9,    9,     9,    10,    12,    15,    20,    30 },
      { 9,    9,    10,    11,    13,    17,    22,    33 },
      { 9,    9,    10,    12,    14,    18,    24,    36 },
      { 9,   10,    12,    13,    16,    20,    26,    39 }, // fixed font default (13)
      { 9,   10,    12,    14,    17,    21,    28,    42 },
      { 9,   10,    13,    15,    18,    23,    30,    45 },
      { 9,   10,    13,    16,    18,    24,    32,    48 } // proportional font default (16)
};
// HTML       1      2      3      4      5      6      7
// CSS  xxs   xs     s      m      l     xl     xxl
//                          |
//                      user pref

// For values outside the range of the table, we use Todd Fahrner's suggested scale
// factors for each keyword value.
static const float fontSizeFactors[totalKeywords] = { 0.60f, 0.75f, 0.89f, 1.0f, 1.2f, 1.5f, 2.0f, 3.0f };

float StyleResolver::fontSizeForKeyword(Document* document, int keyword, bool shouldUseFixedDefaultSize)
{
    Settings* settings = document->settings();
    if (!settings)
        return 1.0f;

    bool quirksMode = document->inQuirksMode();
    int mediumSize = shouldUseFixedDefaultSize ? settings->defaultFixedFontSize() : settings->defaultFontSize();
    if (mediumSize >= fontSizeTableMin && mediumSize <= fontSizeTableMax) {
        // Look up the entry in the table.
        int row = mediumSize - fontSizeTableMin;
        int col = (keyword - CSSValueXxSmall);
        return quirksMode ? quirksFontSizeTable[row][col] : strictFontSizeTable[row][col];
    }

    // Value is outside the range of the table. Apply the scale factor instead.
    float minLogicalSize = max(settings->minimumLogicalFontSize(), 1);
    return max(fontSizeFactors[keyword - CSSValueXxSmall]*mediumSize, minLogicalSize);
}

template<typename T>
static int findNearestLegacyFontSize(int pixelFontSize, const T* table, int multiplier)
{
    // Ignore table[0] because xx-small does not correspond to any legacy font size.
    for (int i = 1; i < totalKeywords - 1; i++) {
        if (pixelFontSize * 2 < (table[i] + table[i + 1]) * multiplier)
            return i;
    }
    return totalKeywords - 1;
}

int StyleResolver::legacyFontSize(Document* document, int pixelFontSize, bool shouldUseFixedDefaultSize)
{
    Settings* settings = document->settings();
    if (!settings)
        return 1;

    bool quirksMode = document->inQuirksMode();
    int mediumSize = shouldUseFixedDefaultSize ? settings->defaultFixedFontSize() : settings->defaultFontSize();
    if (mediumSize >= fontSizeTableMin && mediumSize <= fontSizeTableMax) {
        int row = mediumSize - fontSizeTableMin;
        return findNearestLegacyFontSize<int>(pixelFontSize, quirksMode ? quirksFontSizeTable[row] : strictFontSizeTable[row], 1);
    }

    return findNearestLegacyFontSize<float>(pixelFontSize, fontSizeFactors, mediumSize);
}

static Color colorForCSSValue(int cssValueId)
{
    struct ColorValue {
        int cssValueId;
        RGBA32 color;
    };

    static const ColorValue colorValues[] = {
        { CSSValueAqua, 0xFF00FFFF },
        { CSSValueBlack, 0xFF000000 },
        { CSSValueBlue, 0xFF0000FF },
        { CSSValueFuchsia, 0xFFFF00FF },
        { CSSValueGray, 0xFF808080 },
        { CSSValueGreen, 0xFF008000  },
        { CSSValueGrey, 0xFF808080 },
        { CSSValueLime, 0xFF00FF00 },
        { CSSValueMaroon, 0xFF800000 },
        { CSSValueNavy, 0xFF000080 },
        { CSSValueOlive, 0xFF808000  },
        { CSSValueOrange, 0xFFFFA500 },
        { CSSValuePurple, 0xFF800080 },
        { CSSValueRed, 0xFFFF0000 },
        { CSSValueSilver, 0xFFC0C0C0 },
        { CSSValueTeal, 0xFF008080  },
        { CSSValueTransparent, 0x00000000 },
        { CSSValueWhite, 0xFFFFFFFF },
        { CSSValueYellow, 0xFFFFFF00 },
        { 0, 0 }
    };

    for (const ColorValue* col = colorValues; col->cssValueId; ++col) {
        if (col->cssValueId == cssValueId)
            return col->color;
    }
    return RenderTheme::defaultTheme()->systemColor(cssValueId);
}

bool StyleResolver::colorFromPrimitiveValueIsDerivedFromElement(CSSPrimitiveValue* value)
{
    int ident = value->getIdent();
    switch (ident) {
    case CSSValueWebkitText:
    case CSSValueWebkitLink:
    case CSSValueWebkitActivelink:
    case CSSValueCurrentcolor:
        return true;
    default:
        return false;
    }
}

Color StyleResolver::colorFromPrimitiveValue(const StyleResolver::State& state, CSSPrimitiveValue* value, bool forVisitedLink)
{
    if (value->isRGBColor())
        return Color(value->getRGBA32Value());

    int ident = value->getIdent();
    switch (ident) {
    case 0:
        return Color();
    case CSSValueWebkitText:
        return state.document()->textColor();
    case CSSValueWebkitLink:
        return (state.element()->isLink() && forVisitedLink) ? state.document()->visitedLinkColor() : state.document()->linkColor();
    case CSSValueWebkitActivelink:
        return state.document()->activeLinkColor();
    case CSSValueWebkitFocusRingColor:
        return RenderTheme::focusRingColor();
    case CSSValueCurrentcolor:
        return state.style()->color();
    default:
        return colorForCSSValue(ident);
    }
}

void StyleResolver::addViewportDependentMediaQueryResult(const MediaQueryExp* expr, bool result)
{
    m_viewportDependentMediaQueryResults.append(adoptPtr(new MediaQueryResult(*expr, result)));
}

bool StyleResolver::affectedByViewportChange() const
{
    unsigned s = m_viewportDependentMediaQueryResults.size();
    for (unsigned i = 0; i < s; i++) {
        if (m_medium->eval(&m_viewportDependentMediaQueryResults[i]->m_expression) != m_viewportDependentMediaQueryResults[i]->m_result)
            return true;
    }
    return false;
}

static TransformOperation::OperationType getTransformOperationType(WebKitCSSTransformValue::TransformOperationType type)
{
    switch (type) {
    case WebKitCSSTransformValue::ScaleTransformOperation: return TransformOperation::SCALE;
    case WebKitCSSTransformValue::ScaleXTransformOperation: return TransformOperation::SCALE_X;
    case WebKitCSSTransformValue::ScaleYTransformOperation: return TransformOperation::SCALE_Y;
    case WebKitCSSTransformValue::ScaleZTransformOperation: return TransformOperation::SCALE_Z;
    case WebKitCSSTransformValue::Scale3DTransformOperation: return TransformOperation::SCALE_3D;
    case WebKitCSSTransformValue::TranslateTransformOperation: return TransformOperation::TRANSLATE;
    case WebKitCSSTransformValue::TranslateXTransformOperation: return TransformOperation::TRANSLATE_X;
    case WebKitCSSTransformValue::TranslateYTransformOperation: return TransformOperation::TRANSLATE_Y;
    case WebKitCSSTransformValue::TranslateZTransformOperation: return TransformOperation::TRANSLATE_Z;
    case WebKitCSSTransformValue::Translate3DTransformOperation: return TransformOperation::TRANSLATE_3D;
    case WebKitCSSTransformValue::RotateTransformOperation: return TransformOperation::ROTATE;
    case WebKitCSSTransformValue::RotateXTransformOperation: return TransformOperation::ROTATE_X;
    case WebKitCSSTransformValue::RotateYTransformOperation: return TransformOperation::ROTATE_Y;
    case WebKitCSSTransformValue::RotateZTransformOperation: return TransformOperation::ROTATE_Z;
    case WebKitCSSTransformValue::Rotate3DTransformOperation: return TransformOperation::ROTATE_3D;
    case WebKitCSSTransformValue::SkewTransformOperation: return TransformOperation::SKEW;
    case WebKitCSSTransformValue::SkewXTransformOperation: return TransformOperation::SKEW_X;
    case WebKitCSSTransformValue::SkewYTransformOperation: return TransformOperation::SKEW_Y;
    case WebKitCSSTransformValue::MatrixTransformOperation: return TransformOperation::MATRIX;
    case WebKitCSSTransformValue::Matrix3DTransformOperation: return TransformOperation::MATRIX_3D;
    case WebKitCSSTransformValue::PerspectiveTransformOperation: return TransformOperation::PERSPECTIVE;
    case WebKitCSSTransformValue::UnknownTransformOperation: return TransformOperation::NONE;
    }
    return TransformOperation::NONE;
}

bool StyleResolver::createTransformOperations(CSSValue* inValue, RenderStyle* style, RenderStyle* rootStyle, TransformOperations& outOperations)
{
    if (!inValue || !inValue->isValueList()) {
        outOperations.clear();
        return false;
    }

    float zoomFactor = style ? style->effectiveZoom() : 1;
    TransformOperations operations;
    for (CSSValueListIterator i = inValue; i.hasMore(); i.advance()) {
        CSSValue* currValue = i.value();

        if (!currValue->isWebKitCSSTransformValue())
            continue;

        WebKitCSSTransformValue* transformValue = static_cast<WebKitCSSTransformValue*>(i.value());
        if (!transformValue->length())
            continue;

        bool haveNonPrimitiveValue = false;
        for (unsigned j = 0; j < transformValue->length(); ++j) {
            if (!transformValue->itemWithoutBoundsCheck(j)->isPrimitiveValue()) {
                haveNonPrimitiveValue = true;
                break;
            }
        }
        if (haveNonPrimitiveValue)
            continue;

        CSSPrimitiveValue* firstValue = static_cast<CSSPrimitiveValue*>(transformValue->itemWithoutBoundsCheck(0));

        switch (transformValue->operationType()) {
        case WebKitCSSTransformValue::ScaleTransformOperation:
        case WebKitCSSTransformValue::ScaleXTransformOperation:
        case WebKitCSSTransformValue::ScaleYTransformOperation: {
            double sx = 1.0;
            double sy = 1.0;
            if (transformValue->operationType() == WebKitCSSTransformValue::ScaleYTransformOperation)
                sy = firstValue->getDoubleValue();
            else {
                sx = firstValue->getDoubleValue();
                if (transformValue->operationType() != WebKitCSSTransformValue::ScaleXTransformOperation) {
                    if (transformValue->length() > 1) {
                        CSSPrimitiveValue* secondValue = static_cast<CSSPrimitiveValue*>(transformValue->itemWithoutBoundsCheck(1));
                        sy = secondValue->getDoubleValue();
                    } else
                        sy = sx;
                }
            }
            operations.operations().append(ScaleTransformOperation::create(sx, sy, 1.0, getTransformOperationType(transformValue->operationType())));
            break;
        }
        case WebKitCSSTransformValue::ScaleZTransformOperation:
        case WebKitCSSTransformValue::Scale3DTransformOperation: {
            double sx = 1.0;
            double sy = 1.0;
            double sz = 1.0;
            if (transformValue->operationType() == WebKitCSSTransformValue::ScaleZTransformOperation)
                sz = firstValue->getDoubleValue();
            else if (transformValue->operationType() == WebKitCSSTransformValue::ScaleYTransformOperation)
                sy = firstValue->getDoubleValue();
            else {
                sx = firstValue->getDoubleValue();
                if (transformValue->operationType() != WebKitCSSTransformValue::ScaleXTransformOperation) {
                    if (transformValue->length() > 2) {
                        CSSPrimitiveValue* thirdValue = static_cast<CSSPrimitiveValue*>(transformValue->itemWithoutBoundsCheck(2));
                        sz = thirdValue->getDoubleValue();
                    }
                    if (transformValue->length() > 1) {
                        CSSPrimitiveValue* secondValue = static_cast<CSSPrimitiveValue*>(transformValue->itemWithoutBoundsCheck(1));
                        sy = secondValue->getDoubleValue();
                    } else
                        sy = sx;
                }
            }
            operations.operations().append(ScaleTransformOperation::create(sx, sy, sz, getTransformOperationType(transformValue->operationType())));
            break;
        }
        case WebKitCSSTransformValue::TranslateTransformOperation:
        case WebKitCSSTransformValue::TranslateXTransformOperation:
        case WebKitCSSTransformValue::TranslateYTransformOperation: {
            Length tx = Length(0, Fixed);
            Length ty = Length(0, Fixed);
            if (transformValue->operationType() == WebKitCSSTransformValue::TranslateYTransformOperation)
                ty = convertToFloatLength(firstValue, style, rootStyle, zoomFactor);
            else {
                tx = convertToFloatLength(firstValue, style, rootStyle, zoomFactor);
                if (transformValue->operationType() != WebKitCSSTransformValue::TranslateXTransformOperation) {
                    if (transformValue->length() > 1) {
                        CSSPrimitiveValue* secondValue = static_cast<CSSPrimitiveValue*>(transformValue->itemWithoutBoundsCheck(1));
                        ty = convertToFloatLength(secondValue, style, rootStyle, zoomFactor);
                    }
                }
            }

            if (tx.isUndefined() || ty.isUndefined())
                return false;

            operations.operations().append(TranslateTransformOperation::create(tx, ty, Length(0, Fixed), getTransformOperationType(transformValue->operationType())));
            break;
        }
        case WebKitCSSTransformValue::TranslateZTransformOperation:
        case WebKitCSSTransformValue::Translate3DTransformOperation: {
            Length tx = Length(0, Fixed);
            Length ty = Length(0, Fixed);
            Length tz = Length(0, Fixed);
            if (transformValue->operationType() == WebKitCSSTransformValue::TranslateZTransformOperation)
                tz = convertToFloatLength(firstValue, style, rootStyle, zoomFactor);
            else if (transformValue->operationType() == WebKitCSSTransformValue::TranslateYTransformOperation)
                ty = convertToFloatLength(firstValue, style, rootStyle, zoomFactor);
            else {
                tx = convertToFloatLength(firstValue, style, rootStyle, zoomFactor);
                if (transformValue->operationType() != WebKitCSSTransformValue::TranslateXTransformOperation) {
                    if (transformValue->length() > 2) {
                        CSSPrimitiveValue* thirdValue = static_cast<CSSPrimitiveValue*>(transformValue->itemWithoutBoundsCheck(2));
                        tz = convertToFloatLength(thirdValue, style, rootStyle, zoomFactor);
                    }
                    if (transformValue->length() > 1) {
                        CSSPrimitiveValue* secondValue = static_cast<CSSPrimitiveValue*>(transformValue->itemWithoutBoundsCheck(1));
                        ty = convertToFloatLength(secondValue, style, rootStyle, zoomFactor);
                    }
                }
            }

            if (tx.isUndefined() || ty.isUndefined() || tz.isUndefined())
                return false;

            operations.operations().append(TranslateTransformOperation::create(tx, ty, tz, getTransformOperationType(transformValue->operationType())));
            break;
        }
        case WebKitCSSTransformValue::RotateTransformOperation: {
            double angle = firstValue->computeDegrees();
            operations.operations().append(RotateTransformOperation::create(0, 0, 1, angle, getTransformOperationType(transformValue->operationType())));
            break;
        }
        case WebKitCSSTransformValue::RotateXTransformOperation:
        case WebKitCSSTransformValue::RotateYTransformOperation:
        case WebKitCSSTransformValue::RotateZTransformOperation: {
            double x = 0;
            double y = 0;
            double z = 0;
            double angle = firstValue->computeDegrees();

            if (transformValue->operationType() == WebKitCSSTransformValue::RotateXTransformOperation)
                x = 1;
            else if (transformValue->operationType() == WebKitCSSTransformValue::RotateYTransformOperation)
                y = 1;
            else
                z = 1;
            operations.operations().append(RotateTransformOperation::create(x, y, z, angle, getTransformOperationType(transformValue->operationType())));
            break;
        }
        case WebKitCSSTransformValue::Rotate3DTransformOperation: {
            if (transformValue->length() < 4)
                break;
            CSSPrimitiveValue* secondValue = static_cast<CSSPrimitiveValue*>(transformValue->itemWithoutBoundsCheck(1));
            CSSPrimitiveValue* thirdValue = static_cast<CSSPrimitiveValue*>(transformValue->itemWithoutBoundsCheck(2));
            CSSPrimitiveValue* fourthValue = static_cast<CSSPrimitiveValue*>(transformValue->itemWithoutBoundsCheck(3));
            double x = firstValue->getDoubleValue();
            double y = secondValue->getDoubleValue();
            double z = thirdValue->getDoubleValue();
            double angle = fourthValue->computeDegrees();
            operations.operations().append(RotateTransformOperation::create(x, y, z, angle, getTransformOperationType(transformValue->operationType())));
            break;
        }
        case WebKitCSSTransformValue::SkewTransformOperation:
        case WebKitCSSTransformValue::SkewXTransformOperation:
        case WebKitCSSTransformValue::SkewYTransformOperation: {
            double angleX = 0;
            double angleY = 0;
            double angle = firstValue->computeDegrees();
            if (transformValue->operationType() == WebKitCSSTransformValue::SkewYTransformOperation)
                angleY = angle;
            else {
                angleX = angle;
                if (transformValue->operationType() == WebKitCSSTransformValue::SkewTransformOperation) {
                    if (transformValue->length() > 1) {
                        CSSPrimitiveValue* secondValue = static_cast<CSSPrimitiveValue*>(transformValue->itemWithoutBoundsCheck(1));
                        angleY = secondValue->computeDegrees();
                    }
                }
            }
            operations.operations().append(SkewTransformOperation::create(angleX, angleY, getTransformOperationType(transformValue->operationType())));
            break;
        }
        case WebKitCSSTransformValue::MatrixTransformOperation: {
            if (transformValue->length() < 6)
                break;
            double a = firstValue->getDoubleValue();
            double b = static_cast<CSSPrimitiveValue*>(transformValue->itemWithoutBoundsCheck(1))->getDoubleValue();
            double c = static_cast<CSSPrimitiveValue*>(transformValue->itemWithoutBoundsCheck(2))->getDoubleValue();
            double d = static_cast<CSSPrimitiveValue*>(transformValue->itemWithoutBoundsCheck(3))->getDoubleValue();
            double e = zoomFactor * static_cast<CSSPrimitiveValue*>(transformValue->itemWithoutBoundsCheck(4))->getDoubleValue();
            double f = zoomFactor * static_cast<CSSPrimitiveValue*>(transformValue->itemWithoutBoundsCheck(5))->getDoubleValue();
            operations.operations().append(MatrixTransformOperation::create(a, b, c, d, e, f));
            break;
        }
        case WebKitCSSTransformValue::Matrix3DTransformOperation: {
            if (transformValue->length() < 16)
                break;
            TransformationMatrix matrix(static_cast<CSSPrimitiveValue*>(transformValue->itemWithoutBoundsCheck(0))->getDoubleValue(),
                               static_cast<CSSPrimitiveValue*>(transformValue->itemWithoutBoundsCheck(1))->getDoubleValue(),
                               static_cast<CSSPrimitiveValue*>(transformValue->itemWithoutBoundsCheck(2))->getDoubleValue(),
                               static_cast<CSSPrimitiveValue*>(transformValue->itemWithoutBoundsCheck(3))->getDoubleValue(),
                               static_cast<CSSPrimitiveValue*>(transformValue->itemWithoutBoundsCheck(4))->getDoubleValue(),
                               static_cast<CSSPrimitiveValue*>(transformValue->itemWithoutBoundsCheck(5))->getDoubleValue(),
                               static_cast<CSSPrimitiveValue*>(transformValue->itemWithoutBoundsCheck(6))->getDoubleValue(),
                               static_cast<CSSPrimitiveValue*>(transformValue->itemWithoutBoundsCheck(7))->getDoubleValue(),
                               static_cast<CSSPrimitiveValue*>(transformValue->itemWithoutBoundsCheck(8))->getDoubleValue(),
                               static_cast<CSSPrimitiveValue*>(transformValue->itemWithoutBoundsCheck(9))->getDoubleValue(),
                               static_cast<CSSPrimitiveValue*>(transformValue->itemWithoutBoundsCheck(10))->getDoubleValue(),
                               static_cast<CSSPrimitiveValue*>(transformValue->itemWithoutBoundsCheck(11))->getDoubleValue(),
                               zoomFactor * static_cast<CSSPrimitiveValue*>(transformValue->itemWithoutBoundsCheck(12))->getDoubleValue(),
                               zoomFactor * static_cast<CSSPrimitiveValue*>(transformValue->itemWithoutBoundsCheck(13))->getDoubleValue(),
                               static_cast<CSSPrimitiveValue*>(transformValue->itemWithoutBoundsCheck(14))->getDoubleValue(),
                               static_cast<CSSPrimitiveValue*>(transformValue->itemWithoutBoundsCheck(15))->getDoubleValue());
            operations.operations().append(Matrix3DTransformOperation::create(matrix));
            break;
        }
        case WebKitCSSTransformValue::PerspectiveTransformOperation: {
            Length p = Length(0, Fixed);
            if (firstValue->isLength())
                p = convertToFloatLength(firstValue, style, rootStyle, zoomFactor);
            else {
                // This is a quirk that should go away when 3d transforms are finalized.
                double val = firstValue->getDoubleValue();
                p = val >= 0 ? Length(clampToPositiveInteger(val), Fixed) : Length(Undefined);
            }

            if (p.isUndefined())
                return false;

            operations.operations().append(PerspectiveTransformOperation::create(p));
            break;
        }
        case WebKitCSSTransformValue::UnknownTransformOperation:
            ASSERT_NOT_REACHED();
            break;
        }
    }

    outOperations = operations;
    return true;
}

#if ENABLE(CSS_FILTERS)
static FilterOperation::OperationType filterOperationForType(WebKitCSSFilterValue::FilterOperationType type)
{
    switch (type) {
    case WebKitCSSFilterValue::ReferenceFilterOperation:
        return FilterOperation::REFERENCE;
    case WebKitCSSFilterValue::GrayscaleFilterOperation:
        return FilterOperation::GRAYSCALE;
    case WebKitCSSFilterValue::SepiaFilterOperation:
        return FilterOperation::SEPIA;
    case WebKitCSSFilterValue::SaturateFilterOperation:
        return FilterOperation::SATURATE;
    case WebKitCSSFilterValue::HueRotateFilterOperation:
        return FilterOperation::HUE_ROTATE;
    case WebKitCSSFilterValue::InvertFilterOperation:
        return FilterOperation::INVERT;
    case WebKitCSSFilterValue::OpacityFilterOperation:
        return FilterOperation::OPACITY;
    case WebKitCSSFilterValue::BrightnessFilterOperation:
        return FilterOperation::BRIGHTNESS;
    case WebKitCSSFilterValue::ContrastFilterOperation:
        return FilterOperation::CONTRAST;
    case WebKitCSSFilterValue::BlurFilterOperation:
        return FilterOperation::BLUR;
    case WebKitCSSFilterValue::DropShadowFilterOperation:
        return FilterOperation::DROP_SHADOW;
#if ENABLE(CSS_SHADERS)
    case WebKitCSSFilterValue::CustomFilterOperation:
        return FilterOperation::CUSTOM;
#endif
    case WebKitCSSFilterValue::UnknownFilterOperation:
        return FilterOperation::NONE;
    }
    return FilterOperation::NONE;
}

#if ENABLE(CSS_FILTERS) && ENABLE(SVG)
void StyleResolver::loadPendingSVGDocuments(State& state)
{
    if (!state.style()->hasFilter() || state.pendingSVGDocuments().isEmpty())
        return;

    CachedResourceLoader* cachedResourceLoader = state.document()->cachedResourceLoader();
    Vector<RefPtr<FilterOperation> >& filterOperations = state.style()->mutableFilter().operations();
    for (unsigned i = 0; i < filterOperations.size(); ++i) {
        RefPtr<FilterOperation> filterOperation = filterOperations.at(i);
        if (filterOperation->getOperationType() == FilterOperation::REFERENCE) {
            ReferenceFilterOperation* referenceFilter = static_cast<ReferenceFilterOperation*>(filterOperation.get());

            WebKitCSSSVGDocumentValue* value = state.pendingSVGDocuments().get(referenceFilter).get();
            if (!value)
                continue;
            CachedSVGDocument* cachedDocument = value->load(cachedResourceLoader);
            if (!cachedDocument)
                continue;

            // Stash the CachedSVGDocument on the reference filter.
            referenceFilter->setCachedSVGDocumentReference(adoptPtr(new CachedSVGDocumentReference(cachedDocument)));
        }
    }
    state.pendingSVGDocuments().clear();
}
#endif

#if ENABLE(CSS_SHADERS)
StyleShader* StyleResolver::styleShader(State& state, CSSValue* value)
{
    if (value->isWebKitCSSShaderValue())
        return cachedOrPendingStyleShaderFromValue(state, static_cast<WebKitCSSShaderValue*>(value));
    return 0;
}

StyleShader* StyleResolver::cachedOrPendingStyleShaderFromValue(State& state, WebKitCSSShaderValue* value)
{
    StyleShader* shader = value->cachedOrPendingShader();
    if (shader && shader->isPendingShader())
        state.setHasPendingShaders(true);
    return shader;
}

void StyleResolver::loadPendingShaders(State& state)
{
    if (!state.style()->hasFilter() || !state.hasPendingShaders())
        return;

    CachedResourceLoader* cachedResourceLoader = state.document()->cachedResourceLoader();

    Vector<RefPtr<FilterOperation> >& filterOperations = state.style()->mutableFilter().operations();
    for (unsigned i = 0; i < filterOperations.size(); ++i) {
        RefPtr<FilterOperation> filterOperation = filterOperations.at(i);
        if (filterOperation->getOperationType() == FilterOperation::CUSTOM) {
            CustomFilterOperation* customFilter = static_cast<CustomFilterOperation*>(filterOperation.get());
            ASSERT(customFilter->program());
            StyleCustomFilterProgram* program = static_cast<StyleCustomFilterProgram*>(customFilter->program());
            if (program->vertexShader() && program->vertexShader()->isPendingShader()) {
                WebKitCSSShaderValue* shaderValue = static_cast<StylePendingShader*>(program->vertexShader())->cssShaderValue();
                program->setVertexShader(shaderValue->cachedShader(cachedResourceLoader));
            }
            if (program->fragmentShader() && program->fragmentShader()->isPendingShader()) {
                WebKitCSSShaderValue* shaderValue = static_cast<StylePendingShader*>(program->fragmentShader())->cssShaderValue();
                program->setFragmentShader(shaderValue->cachedShader(cachedResourceLoader));
            }
        }
    }
    state.setHasPendingShaders(false);
}

static bool sortParametersByNameComparator(const RefPtr<CustomFilterParameter>& a, const RefPtr<CustomFilterParameter>& b)
{
    return codePointCompareLessThan(a->name(), b->name());
}

PassRefPtr<CustomFilterParameter> StyleResolver::parseCustomFilterArrayParameter(const String& name, CSSValueList* values)
{
    RefPtr<CustomFilterArrayParameter> arrayParameter = CustomFilterArrayParameter::create(name);
    for (unsigned i = 0, length = values->length(); i < length; ++i) {
        CSSValue* value = values->itemWithoutBoundsCheck(i);
        if (!value->isPrimitiveValue())
            return 0;
        CSSPrimitiveValue* primitiveValue = static_cast<CSSPrimitiveValue*>(value);
        if (primitiveValue->primitiveType() != CSSPrimitiveValue::CSS_NUMBER)
            return 0;
        arrayParameter->addValue(primitiveValue->getDoubleValue());
    }
    return arrayParameter.release();
}

PassRefPtr<CustomFilterParameter> StyleResolver::parseCustomFilterNumberParameter(const String& name, CSSValueList* values)
{
    RefPtr<CustomFilterNumberParameter> numberParameter = CustomFilterNumberParameter::create(name);
    for (unsigned i = 0; i < values->length(); ++i) {
        CSSValue* value = values->itemWithoutBoundsCheck(i);
        if (!value->isPrimitiveValue())
            return 0;
        CSSPrimitiveValue* primitiveValue = static_cast<CSSPrimitiveValue*>(value);
        if (primitiveValue->primitiveType() != CSSPrimitiveValue::CSS_NUMBER)
            return 0;
        numberParameter->addValue(primitiveValue->getDoubleValue());
    }
    return numberParameter.release();
}

PassRefPtr<CustomFilterParameter> StyleResolver::parseCustomFilterTransformParameter(State& state, const String& name, CSSValueList* values)
{
    RefPtr<CustomFilterTransformParameter> transformParameter = CustomFilterTransformParameter::create(name);
    TransformOperations operations;
    createTransformOperations(values, state.style(), state.rootElementStyle(), operations);
    transformParameter->setOperations(operations);
    return transformParameter.release();
}

PassRefPtr<CustomFilterParameter> StyleResolver::parseCustomFilterParameter(State& state, const String& name, CSSValue* parameterValue)
{
    // FIXME: Implement other parameters types parsing.
    // booleans: https://bugs.webkit.org/show_bug.cgi?id=76438
    // textures: https://bugs.webkit.org/show_bug.cgi?id=71442
    // mat2, mat3, mat4: https://bugs.webkit.org/show_bug.cgi?id=71444
    // Number parameters are wrapped inside a CSSValueList and all
    // the other functions values inherit from CSSValueList.
    if (!parameterValue->isValueList())
        return 0;

    CSSValueList* values = static_cast<CSSValueList*>(parameterValue);
    if (!values->length())
        return 0;

    if (parameterValue->isWebKitCSSArrayFunctionValue())
        return parseCustomFilterArrayParameter(name, values);

    // If the first value of the list is a transform function,
    // then we could safely assume that all the remaining items
    // are transforms. parseCustomFilterTransformParameter will
    // return 0 if that assumption is incorrect.
    if (values->itemWithoutBoundsCheck(0)->isWebKitCSSTransformValue())
        return parseCustomFilterTransformParameter(state, name, values);

    // We can have only arrays of booleans or numbers, so use the first value to choose between those two.
    // We need up to 4 values (all booleans or all numbers).
    if (!values->itemWithoutBoundsCheck(0)->isPrimitiveValue() || values->length() > 4)
        return 0;
    
    CSSPrimitiveValue* firstPrimitiveValue = static_cast<CSSPrimitiveValue*>(values->itemWithoutBoundsCheck(0));
    if (firstPrimitiveValue->primitiveType() == CSSPrimitiveValue::CSS_NUMBER)
        return parseCustomFilterNumberParameter(name, values);

    // FIXME: Implement the boolean array parameter here.
    // https://bugs.webkit.org/show_bug.cgi?id=76438

    return 0;
}

bool StyleResolver::parseCustomFilterParameterList(State& state, CSSValue* parametersValue, CustomFilterParameterList& parameterList)
{
    HashSet<String> knownParameterNames;
    CSSValueListIterator parameterIterator(parametersValue);
    for (; parameterIterator.hasMore(); parameterIterator.advance()) {
        if (!parameterIterator.value()->isValueList())
            return false;
        CSSValueListIterator iterator(parameterIterator.value());
        if (!iterator.isPrimitiveValue())
            return false;
        CSSPrimitiveValue* primitiveValue = static_cast<CSSPrimitiveValue*>(iterator.value());
        if (primitiveValue->primitiveType() != CSSPrimitiveValue::CSS_STRING)
            return false;
        
        String name = primitiveValue->getStringValue();
        // Do not allow duplicate parameter names.
        if (knownParameterNames.contains(name))
            return false;
        knownParameterNames.add(name);
        
        iterator.advance();
        
        if (!iterator.hasMore())
            return false;
        
        RefPtr<CustomFilterParameter> parameter = parseCustomFilterParameter(state, name, iterator.value());
        if (!parameter)
            return false;
        parameterList.append(parameter.release());
    }
    
    // Make sure we sort the parameters before passing them down to the CustomFilterOperation.
    std::sort(parameterList.begin(), parameterList.end(), sortParametersByNameComparator);
    
    return true;
}

PassRefPtr<CustomFilterOperation> StyleResolver::createCustomFilterOperationWithAtRuleReferenceSyntax(WebKitCSSFilterValue* filterValue)
{
    // FIXME: Implement style resolution for the custom filter at-rule reference syntax.
    UNUSED_PARAM(filterValue);
    return 0;
}

PassRefPtr<CustomFilterOperation> StyleResolver::createCustomFilterOperationWithInlineSyntax(State& state, WebKitCSSFilterValue* filterValue)
{
    CSSValue* shadersValue = filterValue->itemWithoutBoundsCheck(0);
    ASSERT_WITH_SECURITY_IMPLICATION(shadersValue->isValueList());
    CSSValueList* shadersList = static_cast<CSSValueList*>(shadersValue);

    unsigned shadersListLength = shadersList->length();
    ASSERT(shadersListLength);

    RefPtr<StyleShader> vertexShader = styleShader(state, shadersList->itemWithoutBoundsCheck(0));
    RefPtr<StyleShader> fragmentShader;
    CustomFilterProgramType programType = PROGRAM_TYPE_BLENDS_ELEMENT_TEXTURE;
    CustomFilterProgramMixSettings mixSettings;

    if (shadersListLength > 1) {
        CSSValue* fragmentShaderOrMixFunction = shadersList->itemWithoutBoundsCheck(1);

        if (fragmentShaderOrMixFunction->isWebKitCSSMixFunctionValue()) {
            WebKitCSSMixFunctionValue* mixFunction = static_cast<WebKitCSSMixFunctionValue*>(fragmentShaderOrMixFunction);
            CSSValueListIterator iterator(mixFunction);

            ASSERT(mixFunction->length());
            fragmentShader = styleShader(state, iterator.value());
            iterator.advance();

            ASSERT(mixFunction->length() <= 3);
            while (iterator.hasMore()) {
                CSSPrimitiveValue* primitiveValue = static_cast<CSSPrimitiveValue*>(iterator.value());
                if (CSSParser::isBlendMode(primitiveValue->getIdent()))
                    mixSettings.blendMode = *primitiveValue;
                else if (CSSParser::isCompositeOperator(primitiveValue->getIdent()))
                    mixSettings.compositeOperator = *primitiveValue;
                else
                    ASSERT_NOT_REACHED();
                iterator.advance();
            }
        } else {
            programType = PROGRAM_TYPE_NO_ELEMENT_TEXTURE;
            fragmentShader = styleShader(state, fragmentShaderOrMixFunction);
        }
    }
    
    unsigned meshRows = 1;
    unsigned meshColumns = 1;
    CustomFilterMeshType meshType = MeshTypeAttached;
    
    CSSValue* parametersValue = 0;
    
    if (filterValue->length() > 1) {
        CSSValueListIterator iterator(filterValue->itemWithoutBoundsCheck(1));
        
        // The second value might be the mesh box or the list of parameters:
        // If it starts with a number or any of the mesh-box identifiers it is 
        // the mesh-box list, if not it means it is the parameters list.

        if (iterator.hasMore() && iterator.isPrimitiveValue()) {
            CSSPrimitiveValue* primitiveValue = static_cast<CSSPrimitiveValue*>(iterator.value());
            if (primitiveValue->isNumber()) {
                // If only one integer value is specified, it will set both
                // the rows and the columns.
                meshColumns = meshRows = primitiveValue->getIntValue();
                iterator.advance();
                
                // Try to match another number for the rows.
                if (iterator.hasMore() && iterator.isPrimitiveValue()) {
                    CSSPrimitiveValue* primitiveValue = static_cast<CSSPrimitiveValue*>(iterator.value());
                    if (primitiveValue->isNumber()) {
                        meshRows = primitiveValue->getIntValue();
                        iterator.advance();
                    }
                }
            }
        }
        
        if (iterator.hasMore() && iterator.isPrimitiveValue()) {
            CSSPrimitiveValue* primitiveValue = static_cast<CSSPrimitiveValue*>(iterator.value());
            if (primitiveValue->getIdent() == CSSValueDetached) {
                meshType = MeshTypeDetached;
                iterator.advance();
            }
        }
        
        if (!iterator.index()) {
            // If no value was consumed from the mesh value, then it is just a parameter list, meaning that we end up
            // having just two CSSListValues: list of shaders and list of parameters.
            ASSERT(filterValue->length() == 2);
            parametersValue = filterValue->itemWithoutBoundsCheck(1);
        }
    }
    
    if (filterValue->length() > 2 && !parametersValue)
        parametersValue = filterValue->itemWithoutBoundsCheck(2);
    
    CustomFilterParameterList parameterList;
    if (parametersValue && !parseCustomFilterParameterList(state, parametersValue, parameterList))
        return 0;
    
    RefPtr<StyleCustomFilterProgram> program = StyleCustomFilterProgram::create(vertexShader.release(), fragmentShader.release(), programType, mixSettings, meshType);
    return CustomFilterOperation::create(program.release(), parameterList, meshRows, meshColumns, meshType);
}

PassRefPtr<CustomFilterOperation> StyleResolver::createCustomFilterOperation(State& state, WebKitCSSFilterValue* filterValue)
{
    ASSERT(filterValue->length());
    bool isAtRuleReferenceSyntax = filterValue->itemWithoutBoundsCheck(0)->isPrimitiveValue();
    return isAtRuleReferenceSyntax ? createCustomFilterOperationWithAtRuleReferenceSyntax(filterValue) : createCustomFilterOperationWithInlineSyntax(state, filterValue);
}

#endif

bool StyleResolver::createFilterOperations(State& state, CSSValue* inValue, RenderStyle* style, RenderStyle* rootStyle, FilterOperations& outOperations)
{
    ASSERT(outOperations.isEmpty());
    
    if (!inValue)
        return false;
    
    if (inValue->isPrimitiveValue()) {
        CSSPrimitiveValue* primitiveValue = static_cast<CSSPrimitiveValue*>(inValue);
        if (primitiveValue->getIdent() == CSSValueNone)
            return true;
    }
    
    if (!inValue->isValueList())
        return false;

    float zoomFactor = style ? style->effectiveZoom() : 1;
    FilterOperations operations;
    for (CSSValueListIterator i = inValue; i.hasMore(); i.advance()) {
        CSSValue* currValue = i.value();
        if (!currValue->isWebKitCSSFilterValue())
            continue;

        WebKitCSSFilterValue* filterValue = static_cast<WebKitCSSFilterValue*>(i.value());
        FilterOperation::OperationType operationType = filterOperationForType(filterValue->operationType());

#if ENABLE(CSS_SHADERS)
        if (operationType == FilterOperation::VALIDATED_CUSTOM) {
            // ValidatedCustomFilterOperation is not supposed to end up in the RenderStyle.
            ASSERT_NOT_REACHED();
            continue;
        }
        if (operationType == FilterOperation::CUSTOM) {
            RefPtr<CustomFilterOperation> operation = createCustomFilterOperation(state, filterValue);
            if (!operation)
                return false;
            
            operations.operations().append(operation);
            continue;
        }
#endif
        if (operationType == FilterOperation::REFERENCE) {
#if ENABLE(SVG)
            if (filterValue->length() != 1)
                continue;
            CSSValue* argument = filterValue->itemWithoutBoundsCheck(0);

            if (!argument->isWebKitCSSSVGDocumentValue())
                continue;

            WebKitCSSSVGDocumentValue* svgDocumentValue = static_cast<WebKitCSSSVGDocumentValue*>(argument);
            KURL url = state.document()->completeURL(svgDocumentValue->url());

            RefPtr<ReferenceFilterOperation> operation = ReferenceFilterOperation::create(svgDocumentValue->url(), url.fragmentIdentifier(), operationType);
            if (SVGURIReference::isExternalURIReference(svgDocumentValue->url(), state.document())) {
                if (!svgDocumentValue->loadRequested())
                    state.pendingSVGDocuments().set(operation.get(), svgDocumentValue);
                else if (svgDocumentValue->cachedSVGDocument())
                    operation->setCachedSVGDocumentReference(adoptPtr(new CachedSVGDocumentReference(svgDocumentValue->cachedSVGDocument())));
            }
            operations.operations().append(operation);
#endif
            continue;
        }

        // Check that all parameters are primitive values, with the
        // exception of drop shadow which has a ShadowValue parameter.
        if (operationType != FilterOperation::DROP_SHADOW) {
            bool haveNonPrimitiveValue = false;
            for (unsigned j = 0; j < filterValue->length(); ++j) {
                if (!filterValue->itemWithoutBoundsCheck(j)->isPrimitiveValue()) {
                    haveNonPrimitiveValue = true;
                    break;
                }
            }
            if (haveNonPrimitiveValue)
                continue;
        }

        CSSPrimitiveValue* firstValue = filterValue->length() ? static_cast<CSSPrimitiveValue*>(filterValue->itemWithoutBoundsCheck(0)) : 0;
        switch (filterValue->operationType()) {
        case WebKitCSSFilterValue::GrayscaleFilterOperation:
        case WebKitCSSFilterValue::SepiaFilterOperation:
        case WebKitCSSFilterValue::SaturateFilterOperation: {
            double amount = 1;
            if (filterValue->length() == 1) {
                amount = firstValue->getDoubleValue();
                if (firstValue->isPercentage())
                    amount /= 100;
            }

            operations.operations().append(BasicColorMatrixFilterOperation::create(amount, operationType));
            break;
        }
        case WebKitCSSFilterValue::HueRotateFilterOperation: {
            double angle = 0;
            if (filterValue->length() == 1)
                angle = firstValue->computeDegrees();

            operations.operations().append(BasicColorMatrixFilterOperation::create(angle, operationType));
            break;
        }
        case WebKitCSSFilterValue::InvertFilterOperation:
        case WebKitCSSFilterValue::BrightnessFilterOperation:
        case WebKitCSSFilterValue::ContrastFilterOperation:
        case WebKitCSSFilterValue::OpacityFilterOperation: {
            double amount = (filterValue->operationType() == WebKitCSSFilterValue::BrightnessFilterOperation) ? 0 : 1;
            if (filterValue->length() == 1) {
                amount = firstValue->getDoubleValue();
                if (firstValue->isPercentage())
                    amount /= 100;
            }

            operations.operations().append(BasicComponentTransferFilterOperation::create(amount, operationType));
            break;
        }
        case WebKitCSSFilterValue::BlurFilterOperation: {
            Length stdDeviation = Length(0, Fixed);
            if (filterValue->length() >= 1)
                stdDeviation = convertToFloatLength(firstValue, style, rootStyle, zoomFactor);
            if (stdDeviation.isUndefined())
                return false;

            operations.operations().append(BlurFilterOperation::create(stdDeviation, operationType));
            break;
        }
        case WebKitCSSFilterValue::DropShadowFilterOperation: {
            if (filterValue->length() != 1)
                return false;

            CSSValue* cssValue = filterValue->itemWithoutBoundsCheck(0);
            if (!cssValue->isShadowValue())
                continue;

            ShadowValue* item = static_cast<ShadowValue*>(cssValue);
            IntPoint location(item->x->computeLength<int>(style, rootStyle, zoomFactor),
                              item->y->computeLength<int>(style, rootStyle, zoomFactor));
            int blur = item->blur ? item->blur->computeLength<int>(style, rootStyle, zoomFactor) : 0;
            Color color;
            if (item->color)
                color = colorFromPrimitiveValue(state, item->color.get());

            operations.operations().append(DropShadowFilterOperation::create(location, blur, color.isValid() ? color : Color::transparent, operationType));
            break;
        }
        case WebKitCSSFilterValue::UnknownFilterOperation:
        default:
            ASSERT_NOT_REACHED();
            break;
        }
    }

    outOperations = operations;
    return true;
}

#endif

PassRefPtr<StyleImage> StyleResolver::loadPendingImage(State& state, StylePendingImage* pendingImage)
{
    CachedResourceLoader* cachedResourceLoader = state.document()->cachedResourceLoader();

    if (pendingImage->cssImageValue()) {
        CSSImageValue* imageValue = pendingImage->cssImageValue();
        return imageValue->cachedImage(cachedResourceLoader);
    }

    if (pendingImage->cssImageGeneratorValue()) {
        CSSImageGeneratorValue* imageGeneratorValue = pendingImage->cssImageGeneratorValue();
        imageGeneratorValue->loadSubimages(cachedResourceLoader);
        return StyleGeneratedImage::create(imageGeneratorValue);
    }

    if (pendingImage->cssCursorImageValue()) {
        CSSCursorImageValue* cursorImageValue = pendingImage->cssCursorImageValue();
        return cursorImageValue->cachedImage(cachedResourceLoader);
    }

#if ENABLE(CSS_IMAGE_SET)
    if (pendingImage->cssImageSetValue()) {
        CSSImageSetValue* imageSetValue = pendingImage->cssImageSetValue();
        return imageSetValue->cachedImageSet(cachedResourceLoader);
    }
#endif

    return 0;
}

void StyleResolver::loadPendingImages(State& state)
{
    if (state.pendingImageProperties().isEmpty())
        return;

    PendingImagePropertyMap::const_iterator::Keys end = state.pendingImageProperties().end().keys();
    for (PendingImagePropertyMap::const_iterator::Keys it = state.pendingImageProperties().begin().keys(); it != end; ++it) {
        CSSPropertyID currentProperty = *it;

        switch (currentProperty) {
        case CSSPropertyBackgroundImage: {
            for (FillLayer* backgroundLayer = state.style()->accessBackgroundLayers(); backgroundLayer; backgroundLayer = backgroundLayer->next()) {
                if (backgroundLayer->image() && backgroundLayer->image()->isPendingImage())
                    backgroundLayer->setImage(loadPendingImage(state, static_cast<StylePendingImage*>(backgroundLayer->image())));
            }
            break;
        }
        case CSSPropertyContent: {
            for (ContentData* contentData = const_cast<ContentData*>(state.style()->contentData()); contentData; contentData = contentData->next()) {
                if (contentData->isImage()) {
                    StyleImage* image = static_cast<ImageContentData*>(contentData)->image();
                    if (image->isPendingImage()) {
                        RefPtr<StyleImage> loadedImage = loadPendingImage(state, static_cast<StylePendingImage*>(image));
                        if (loadedImage)
                            static_cast<ImageContentData*>(contentData)->setImage(loadedImage.release());
                    }
                }
            }
            break;
        }
        case CSSPropertyCursor: {
            if (CursorList* cursorList = state.style()->cursors()) {
                for (size_t i = 0; i < cursorList->size(); ++i) {
                    CursorData& currentCursor = cursorList->at(i);
                    if (StyleImage* image = currentCursor.image()) {
                        if (image->isPendingImage())
                            currentCursor.setImage(loadPendingImage(state, static_cast<StylePendingImage*>(image)));
                    }
                }
            }
            break;
        }
        case CSSPropertyListStyleImage: {
            if (state.style()->listStyleImage() && state.style()->listStyleImage()->isPendingImage())
                state.style()->setListStyleImage(loadPendingImage(state, static_cast<StylePendingImage*>(state.style()->listStyleImage())));
            break;
        }
        case CSSPropertyBorderImageSource: {
            if (state.style()->borderImageSource() && state.style()->borderImageSource()->isPendingImage())
                state.style()->setBorderImageSource(loadPendingImage(state, static_cast<StylePendingImage*>(state.style()->borderImageSource())));
            break;
        }
        case CSSPropertyWebkitBoxReflect: {
            if (StyleReflection* reflection = state.style()->boxReflect()) {
                const NinePieceImage& maskImage = reflection->mask();
                if (maskImage.image() && maskImage.image()->isPendingImage()) {
                    RefPtr<StyleImage> loadedImage = loadPendingImage(state, static_cast<StylePendingImage*>(maskImage.image()));
                    reflection->setMask(NinePieceImage(loadedImage.release(), maskImage.imageSlices(), maskImage.fill(), maskImage.borderSlices(), maskImage.outset(), maskImage.horizontalRule(), maskImage.verticalRule()));
                }
            }
            break;
        }
        case CSSPropertyWebkitMaskBoxImageSource: {
            if (state.style()->maskBoxImageSource() && state.style()->maskBoxImageSource()->isPendingImage())
                state.style()->setMaskBoxImageSource(loadPendingImage(state, static_cast<StylePendingImage*>(state.style()->maskBoxImageSource())));
            break;
        }
        case CSSPropertyWebkitMaskImage: {
            for (FillLayer* maskLayer = state.style()->accessMaskLayers(); maskLayer; maskLayer = maskLayer->next()) {
                if (maskLayer->image() && maskLayer->image()->isPendingImage())
                    maskLayer->setImage(loadPendingImage(state, static_cast<StylePendingImage*>(maskLayer->image())));
            }
            break;
        }
        default:
            ASSERT_NOT_REACHED();
        }
    }

    state.pendingImageProperties().clear();
}

void StyleResolver::loadPendingResources(State& state)
{
    // Start loading images referenced by this style.
    loadPendingImages(state);

#if ENABLE(CSS_SHADERS)
    // Start loading the shaders referenced by this style.
    loadPendingShaders(state);
#endif
    
#if ENABLE(CSS_FILTERS) && ENABLE(SVG)
    // Start loading the SVG Documents referenced by this style.
    loadPendingSVGDocuments(state);
#endif
}

void StyleResolver::MatchedProperties::reportMemoryUsage(MemoryObjectInfo* memoryObjectInfo) const
{
    MemoryClassInfo info(memoryObjectInfo, this, WebCoreMemoryTypes::CSS);
    info.addMember(properties, "properties");
}

void StyleResolver::MatchedPropertiesCacheItem::reportMemoryUsage(MemoryObjectInfo* memoryObjectInfo) const
{
    MemoryClassInfo info(memoryObjectInfo, this, WebCoreMemoryTypes::CSS);
    info.addMember(matchedProperties, "matchedProperties");
    info.addMember(ranges, "ranges");
    info.addMember(renderStyle, "renderStyle");
    info.addMember(parentRenderStyle, "parentRenderStyle");
}

void MediaQueryResult::reportMemoryUsage(MemoryObjectInfo* memoryObjectInfo) const
{
    MemoryClassInfo info(memoryObjectInfo, this, WebCoreMemoryTypes::CSS);
    info.addMember(m_expression, "expression");
}

void StyleResolver::reportMemoryUsage(MemoryObjectInfo* memoryObjectInfo) const
{
    MemoryClassInfo info(memoryObjectInfo, this, WebCoreMemoryTypes::CSS);
    info.addMember(m_ruleSets, "ruleSets");
    info.addMember(m_keyframesRuleMap, "keyframesRuleMap");
    info.addMember(m_matchedPropertiesCache, "matchedPropertiesCache");
    info.addMember(m_matchedPropertiesCacheSweepTimer, "matchedPropertiesCacheSweepTimer");

    info.addMember(m_medium, "medium");
    info.addMember(m_rootDefaultStyle, "rootDefaultStyle");
    info.addMember(m_document, "document");

    info.addMember(m_fontSelector, "fontSelector");
    info.addMember(m_viewportDependentMediaQueryResults, "viewportDependentMediaQueryResults");
    info.ignoreMember(m_styleBuilder);
    info.addMember(m_inspectorCSSOMWrappers);
    info.addMember(m_scopeResolver, "scopeResolver");

    // FIXME: move this to a place where it would be called only once?
    info.addMember(CSSDefaultStyleSheets::defaultStyle, "defaultStyle");
    info.addMember(CSSDefaultStyleSheets::defaultQuirksStyle, "defaultQuirksStyle");
    info.addMember(CSSDefaultStyleSheets::defaultPrintStyle,"defaultPrintStyle");
    info.addMember(CSSDefaultStyleSheets::defaultViewSourceStyle, "defaultViewSourceStyle");
}

} // namespace WebCore
