Source/core/inspector/InspectorCSSAgent.cpp

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This source file includes following definitions.
computePseudoClassMask
StyleSheetAction
m_styleSheets
setCSSStyleSheet
m_text
perform
undo
redo
mergeId
merge
m_overwrite
toString
perform
undo
redo
mergeId
merge
m_selector
perform
undo
redo
m_selector
perform
undo
redo
newRuleId
asCSSStyleRule
vendorPrefixLowerCase
m_isSettingStyleSheetText
setFrontend
clearFrontend
discardAgent
restore
flushPendingFrontendMessages
reset
resetNonPersistentData
enable
wasEnabled
disable
didCommitLoadForMainFrame
mediaQueryResultChanged
willMutateRules
didMutateRules
willMutateStyle
didMutateStyle
activeStyleSheetsUpdated
updateActiveStyleSheets
setActiveStyleSheets
documentDetached
forcePseudoState
getMatchedStylesForNode
getInlineStylesForNode
getComputedStyleForNode
collectPlatformFontsForRenderer
getPlatformFontsForNode
getStyleSheetText
setStyleSheetText
extractRangeComponent
jsonRangeToSourceRange
setPropertyText
setRuleSelector
createStyleSheet
addRule
forcePseudoState
buildMediaObject
buildMediaListChain
asInspectorStyleSheet
elementForId
collectAllStyleSheets
collectAllDocumentStyleSheets
collectStyleSheets
bindStyleSheet
unbindStyleSheet
viaInspectorStyleSheet
assertInspectorStyleSheetForId
assertStyleSheetForId
detectOrigin
buildObjectForRule
matchesPseudoElement
buildArrayForMatchedRuleList
buildObjectForAttributesStyle
didRemoveDocument
didRemoveDOMNode
didModifyDOMAttr
styleSheetChanged
willReparseStyleSheet
didReparseStyleSheet
resetPseudoStates
/*
 * Copyright (C) 2010, Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 2.  Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"
#include "core/inspector/InspectorCSSAgent.h"

#include "CSSPropertyNames.h"
#include "FetchInitiatorTypeNames.h"
#include "InspectorTypeBuilder.h"
#include "StylePropertyShorthand.h"
#include "bindings/v8/ExceptionState.h"
#include "bindings/v8/ExceptionStatePlaceholder.h"
#include "core/css/CSSComputedStyleDeclaration.h"
#include "core/css/CSSDefaultStyleSheets.h"
#include "core/css/CSSImportRule.h"
#include "core/css/CSSMediaRule.h"
#include "core/css/CSSRule.h"
#include "core/css/CSSRuleList.h"
#include "core/css/CSSStyleRule.h"
#include "core/css/CSSStyleSheet.h"
#include "core/css/MediaList.h"
#include "core/css/StylePropertySet.h"
#include "core/css/StyleRule.h"
#include "core/css/StyleSheet.h"
#include "core/css/StyleSheetContents.h"
#include "core/css/StyleSheetList.h"
#include "core/css/resolver/StyleResolver.h"
#include "core/dom/Node.h"
#include "core/dom/NodeList.h"
#include "core/fetch/CSSStyleSheetResource.h"
#include "core/fetch/ResourceClient.h"
#include "core/fetch/ResourceFetcher.h"
#include "core/fetch/StyleSheetResourceClient.h"
#include "core/frame/LocalFrame.h"
#include "core/html/HTMLHeadElement.h"
#include "core/inspector/InspectorHistory.h"
#include "core/inspector/InspectorPageAgent.h"
#include "core/inspector/InspectorResourceAgent.h"
#include "core/inspector/InspectorState.h"
#include "core/inspector/InstrumentingAgents.h"
#include "core/loader/DocumentLoader.h"
#include "core/page/Page.h"
#include "core/rendering/InlineTextBox.h"
#include "core/rendering/RenderObject.h"
#include "core/rendering/RenderText.h"
#include "core/rendering/RenderTextFragment.h"
#include "platform/fonts/Font.h"
#include "platform/fonts/GlyphBuffer.h"
#include "platform/fonts/WidthIterator.h"
#include "platform/text/TextRun.h"
#include "wtf/CurrentTime.h"
#include "wtf/text/CString.h"
#include "wtf/text/StringConcatenate.h"

namespace CSSAgentState {
static const char cssAgentEnabled[] = "cssAgentEnabled";
}

typedef WebCore::InspectorBackendDispatcher::CSSCommandHandler::EnableCallback EnableCallback;

namespace WebCore {

enum ForcePseudoClassFlags {
    PseudoNone = 0,
    PseudoHover = 1 << 0,
    PseudoFocus = 1 << 1,
    PseudoActive = 1 << 2,
    PseudoVisited = 1 << 3
};

static unsigned computePseudoClassMask(JSONArray* pseudoClassArray)
{
    DEFINE_STATIC_LOCAL(String, active, ("active"));
    DEFINE_STATIC_LOCAL(String, hover, ("hover"));
    DEFINE_STATIC_LOCAL(String, focus, ("focus"));
    DEFINE_STATIC_LOCAL(String, visited, ("visited"));
    if (!pseudoClassArray || !pseudoClassArray->length())
        return PseudoNone;

    unsigned result = PseudoNone;
    for (size_t i = 0; i < pseudoClassArray->length(); ++i) {
        RefPtr<JSONValue> pseudoClassValue = pseudoClassArray->get(i);
        String pseudoClass;
        bool success = pseudoClassValue->asString(&pseudoClass);
        if (!success)
            continue;
        if (pseudoClass == active)
            result |= PseudoActive;
        else if (pseudoClass == hover)
            result |= PseudoHover;
        else if (pseudoClass == focus)
            result |= PseudoFocus;
        else if (pseudoClass == visited)
            result |= PseudoVisited;
    }

    return result;
}

class InspectorCSSAgent::StyleSheetAction : public InspectorHistory::Action {
    WTF_MAKE_NONCOPYABLE(StyleSheetAction);
public:
    StyleSheetAction(const String& name)
        : InspectorHistory::Action(name)
    {
    }
};

class InspectorCSSAgent::EnableResourceClient FINAL : public StyleSheetResourceClient {
public:
    EnableResourceClient(InspectorCSSAgent*, const Vector<InspectorStyleSheet*>&, PassRefPtr<EnableCallback>);

    virtual void setCSSStyleSheet(const String&, const KURL&, const String&, const CSSStyleSheetResource*) OVERRIDE;

private:
    RefPtr<EnableCallback> m_callback;
    InspectorCSSAgent* m_cssAgent;
    int m_pendingResources;
    Vector<InspectorStyleSheet*> m_styleSheets;
};

InspectorCSSAgent::EnableResourceClient::EnableResourceClient(InspectorCSSAgent* cssAgent, const Vector<InspectorStyleSheet*>& styleSheets, PassRefPtr<EnableCallback> callback)
    : m_callback(callback)
    , m_cssAgent(cssAgent)
    , m_pendingResources(styleSheets.size())
    , m_styleSheets(styleSheets)
{
    for (size_t i = 0; i < styleSheets.size(); ++i) {
        InspectorStyleSheet* styleSheet = styleSheets.at(i);
        Document* document = styleSheet->ownerDocument();
        FetchRequest request(ResourceRequest(styleSheet->finalURL()), FetchInitiatorTypeNames::internal);
        ResourcePtr<Resource> resource = document->fetcher()->fetchCSSStyleSheet(request);
        resource->addClient(this);
    }
}

void InspectorCSSAgent::EnableResourceClient::setCSSStyleSheet(const String&, const KURL& url, const String&, const CSSStyleSheetResource* resource)
{
    const_cast<CSSStyleSheetResource*>(resource)->removeClient(this);
    --m_pendingResources;
    if (m_pendingResources)
        return;

    // enable always succeeds.
    if (m_callback->isActive())
        m_cssAgent->wasEnabled(m_callback.release());
    delete this;
}

class InspectorCSSAgent::SetStyleSheetTextAction FINAL : public InspectorCSSAgent::StyleSheetAction {
    WTF_MAKE_NONCOPYABLE(SetStyleSheetTextAction);
public:
    SetStyleSheetTextAction(InspectorStyleSheetBase* styleSheet, const String& text)
        : InspectorCSSAgent::StyleSheetAction("SetStyleSheetText")
        , m_styleSheet(styleSheet)
        , m_text(text)
    {
    }

    virtual bool perform(ExceptionState& exceptionState) OVERRIDE
    {
        if (!m_styleSheet->getText(&m_oldText))
            return false;
        return redo(exceptionState);
    }

    virtual bool undo(ExceptionState& exceptionState) OVERRIDE
    {
        return m_styleSheet->setText(m_oldText, exceptionState);
    }

    virtual bool redo(ExceptionState& exceptionState) OVERRIDE
    {
        return m_styleSheet->setText(m_text, exceptionState);
    }

    virtual String mergeId() OVERRIDE
    {
        return String::format("SetStyleSheetText %s", m_styleSheet->id().utf8().data());
    }

    virtual void merge(PassRefPtr<Action> action) OVERRIDE
    {
        ASSERT(action->mergeId() == mergeId());

        SetStyleSheetTextAction* other = static_cast<SetStyleSheetTextAction*>(action.get());
        m_text = other->m_text;
    }

private:
    RefPtr<InspectorStyleSheetBase> m_styleSheet;
    String m_text;
    String m_oldText;
};

class InspectorCSSAgent::SetPropertyTextAction FINAL : public InspectorCSSAgent::StyleSheetAction {
    WTF_MAKE_NONCOPYABLE(SetPropertyTextAction);
public:
    SetPropertyTextAction(InspectorStyleSheetBase* styleSheet, const InspectorCSSId& cssId, unsigned propertyIndex, const String& text, bool overwrite)
        : InspectorCSSAgent::StyleSheetAction("SetPropertyText")
        , m_styleSheet(styleSheet)
        , m_cssId(cssId)
        , m_propertyIndex(propertyIndex)
        , m_text(text)
        , m_overwrite(overwrite)
    {
    }

    virtual String toString() OVERRIDE
    {
        return mergeId() + ": " + m_oldStyleText + " -> " + m_text;
    }

    virtual bool perform(ExceptionState& exceptionState) OVERRIDE
    {
        return redo(exceptionState);
    }

    virtual bool undo(ExceptionState& exceptionState) OVERRIDE
    {
        String placeholder;
        return m_styleSheet->setStyleText(m_cssId, m_oldStyleText);
    }

    virtual bool redo(ExceptionState& exceptionState) OVERRIDE
    {
        if (!m_styleSheet->getStyleText(m_cssId, &m_oldStyleText))
            return false;
        bool result = m_styleSheet->setPropertyText(m_cssId, m_propertyIndex, m_text, m_overwrite, exceptionState);
        return result;
    }

    virtual String mergeId() OVERRIDE
    {
        return String::format("SetPropertyText %s:%u:%s", m_styleSheet->id().utf8().data(), m_propertyIndex, m_overwrite ? "true" : "false");
    }

    virtual void merge(PassRefPtr<Action> action) OVERRIDE
    {
        ASSERT(action->mergeId() == mergeId());

        SetPropertyTextAction* other = static_cast<SetPropertyTextAction*>(action.get());
        m_text = other->m_text;
    }

private:
    RefPtr<InspectorStyleSheetBase> m_styleSheet;
    InspectorCSSId m_cssId;
    unsigned m_propertyIndex;
    String m_text;
    String m_oldStyleText;
    bool m_overwrite;
};

class InspectorCSSAgent::SetRuleSelectorAction FINAL : public InspectorCSSAgent::StyleSheetAction {
    WTF_MAKE_NONCOPYABLE(SetRuleSelectorAction);
public:
    SetRuleSelectorAction(InspectorStyleSheet* styleSheet, const InspectorCSSId& cssId, const String& selector)
        : InspectorCSSAgent::StyleSheetAction("SetRuleSelector")
        , m_styleSheet(styleSheet)
        , m_cssId(cssId)
        , m_selector(selector)
    {
    }

    virtual bool perform(ExceptionState& exceptionState) OVERRIDE
    {
        m_oldSelector = m_styleSheet->ruleSelector(m_cssId, exceptionState);
        if (exceptionState.hadException())
            return false;
        return redo(exceptionState);
    }

    virtual bool undo(ExceptionState& exceptionState) OVERRIDE
    {
        return m_styleSheet->setRuleSelector(m_cssId, m_oldSelector, exceptionState);
    }

    virtual bool redo(ExceptionState& exceptionState) OVERRIDE
    {
        return m_styleSheet->setRuleSelector(m_cssId, m_selector, exceptionState);
    }

private:
    RefPtr<InspectorStyleSheet> m_styleSheet;
    InspectorCSSId m_cssId;
    String m_selector;
    String m_oldSelector;
};

class InspectorCSSAgent::AddRuleAction FINAL : public InspectorCSSAgent::StyleSheetAction {
    WTF_MAKE_NONCOPYABLE(AddRuleAction);
public:
    AddRuleAction(InspectorStyleSheet* styleSheet, const String& selector)
        : InspectorCSSAgent::StyleSheetAction("AddRule")
        , m_styleSheet(styleSheet)
        , m_selector(selector)
    {
    }

    virtual bool perform(ExceptionState& exceptionState) OVERRIDE
    {
        return redo(exceptionState);
    }

    virtual bool undo(ExceptionState& exceptionState) OVERRIDE
    {
        return m_styleSheet->deleteRule(m_newId, exceptionState);
    }

    virtual bool redo(ExceptionState& exceptionState) OVERRIDE
    {
        CSSStyleRule* cssStyleRule = m_styleSheet->addRule(m_selector, exceptionState);
        if (exceptionState.hadException())
            return false;
        m_newId = m_styleSheet->ruleId(cssStyleRule);
        return true;
    }

    InspectorCSSId newRuleId() { return m_newId; }

private:
    RefPtr<InspectorStyleSheet> m_styleSheet;
    InspectorCSSId m_newId;
    String m_selector;
    String m_oldSelector;
};

// static
CSSStyleRule* InspectorCSSAgent::asCSSStyleRule(CSSRule* rule)
{
    if (!rule || rule->type() != CSSRule::STYLE_RULE)
        return 0;
    return toCSSStyleRule(rule);
}

template <typename CharType, size_t bufferLength>
static size_t vendorPrefixLowerCase(const CharType* string, size_t stringLength, char (&buffer)[bufferLength])
{
    static const char lowerCaseOffset = 'a' - 'A';

    if (string[0] != '-')
        return 0;

    for (size_t i = 0; i < stringLength - 1; i++) {
        CharType c = string[i + 1];
        if (c == '-')
            return i;
        if (i == bufferLength)
            break;
        if (c < 'A' || c > 'z')
            break;
        if (c >= 'a')
            buffer[i] = c;
        else if (c <= 'Z')
            buffer[i] = c + lowerCaseOffset;
        else
            break;
    }
    return 0;
}

InspectorCSSAgent::InspectorCSSAgent(InspectorDOMAgent* domAgent, InspectorPageAgent* pageAgent, InspectorResourceAgent* resourceAgent)
    : InspectorBaseAgent<InspectorCSSAgent>("CSS")
    , m_frontend(0)
    , m_domAgent(domAgent)
    , m_pageAgent(pageAgent)
    , m_resourceAgent(resourceAgent)
    , m_lastStyleSheetId(1)
    , m_styleSheetsPendingMutation(0)
    , m_styleDeclarationPendingMutation(false)
    , m_creatingViaInspectorStyleSheet(false)
    , m_isSettingStyleSheetText(false)
{
    m_domAgent->setDOMListener(this);
}

InspectorCSSAgent::~InspectorCSSAgent()
{
    ASSERT(!m_domAgent);
    reset();
}

void InspectorCSSAgent::setFrontend(InspectorFrontend* frontend)
{
    ASSERT(!m_frontend);
    m_frontend = frontend->css();
}

void InspectorCSSAgent::clearFrontend()
{
    ASSERT(m_frontend);
    ErrorString error;
    disable(&error);
    m_frontend = 0;
    resetNonPersistentData();
}

void InspectorCSSAgent::discardAgent()
{
    m_domAgent->setDOMListener(0);
    m_domAgent = 0;
}

void InspectorCSSAgent::restore()
{
    if (m_state->getBoolean(CSSAgentState::cssAgentEnabled))
        wasEnabled(nullptr);
}

void InspectorCSSAgent::flushPendingFrontendMessages()
{
    if (!m_invalidatedDocuments.size())
        return;
    HashSet<Document*> invalidatedDocuments;
    m_invalidatedDocuments.swap(&invalidatedDocuments);
    for (HashSet<Document*>::iterator it = invalidatedDocuments.begin(); it != invalidatedDocuments.end(); ++it)
        updateActiveStyleSheets(*it, ExistingFrontendRefresh);
}

void InspectorCSSAgent::reset()
{
    m_idToInspectorStyleSheet.clear();
    m_idToInspectorStyleSheetForInlineStyle.clear();
    m_cssStyleSheetToInspectorStyleSheet.clear();
    m_documentToCSSStyleSheets.clear();
    m_invalidatedDocuments.clear();
    m_nodeToInspectorStyleSheet.clear();
    m_documentToViaInspectorStyleSheet.clear();
    resetNonPersistentData();
}

void InspectorCSSAgent::resetNonPersistentData()
{
    resetPseudoStates();
}

void InspectorCSSAgent::enable(ErrorString*, PassRefPtr<EnableCallback> prpCallback)
{
    m_state->setBoolean(CSSAgentState::cssAgentEnabled, true);

    Vector<InspectorStyleSheet*> styleSheets;
    collectAllStyleSheets(styleSheets);

    // Re-issue stylesheet requets for resources that are no longer in memory cache.
    Vector<InspectorStyleSheet*> styleSheetsToFetch;
    HashSet<String> urlsToFetch;
    for (size_t i = 0; i < styleSheets.size(); ++i) {
        InspectorStyleSheet* styleSheet = styleSheets.at(i);
        String url = styleSheet->finalURL();
        if (urlsToFetch.contains(url))
            continue;
        CSSStyleSheet* pageStyleSheet = styleSheet->pageStyleSheet();
        if (pageStyleSheet->isInline() || !pageStyleSheet->contents()->loadCompleted())
            continue;
        Document* document = styleSheet->ownerDocument();
        if (!document)
            continue;
        Resource* cachedResource = document->fetcher()->cachedResource(document->completeURL(url));
        if (cachedResource)
            continue;
        urlsToFetch.add(styleSheet->finalURL());
        styleSheetsToFetch.append(styleSheet);
    }

    if (styleSheetsToFetch.isEmpty()) {
        wasEnabled(prpCallback);
        return;
    }
    new EnableResourceClient(this, styleSheetsToFetch, prpCallback);
}

void InspectorCSSAgent::wasEnabled(PassRefPtr<EnableCallback> callback)
{
    if (!m_state->getBoolean(CSSAgentState::cssAgentEnabled)) {
        // We were disabled while fetching resources.
        return;
    }

    m_instrumentingAgents->setInspectorCSSAgent(this);
    Vector<Document*> documents = m_domAgent->documents();
    for (Vector<Document*>::iterator it = documents.begin(); it != documents.end(); ++it)
        updateActiveStyleSheets(*it, InitialFrontendLoad);

    if (callback)
        callback->sendSuccess();
}

void InspectorCSSAgent::disable(ErrorString*)
{
    reset();
    m_instrumentingAgents->setInspectorCSSAgent(0);
    m_state->setBoolean(CSSAgentState::cssAgentEnabled, false);
}

void InspectorCSSAgent::didCommitLoadForMainFrame()
{
    reset();
}

void InspectorCSSAgent::mediaQueryResultChanged()
{
    flushPendingFrontendMessages();
    m_frontend->mediaQueryResultChanged();
}

void InspectorCSSAgent::willMutateRules()
{
    ++m_styleSheetsPendingMutation;
}

void InspectorCSSAgent::didMutateRules(CSSStyleSheet* styleSheet)
{
    --m_styleSheetsPendingMutation;
    ASSERT(m_styleSheetsPendingMutation >= 0);

    if (!styleSheetEditInProgress()) {
        Document* owner = styleSheet->ownerDocument();
        if (owner)
            owner->modifiedStyleSheet(styleSheet, RecalcStyleDeferred, FullStyleUpdate);
    }
}

void InspectorCSSAgent::willMutateStyle()
{
    m_styleDeclarationPendingMutation = true;
}

void InspectorCSSAgent::didMutateStyle(CSSStyleDeclaration* style, bool isInlineStyle)
{
    ASSERT(m_styleDeclarationPendingMutation);
    m_styleDeclarationPendingMutation = false;
    if (!styleSheetEditInProgress() && !isInlineStyle) {
        CSSStyleSheet* parentSheet = style->parentStyleSheet();
        Document* owner = parentSheet ? parentSheet->ownerDocument() : 0;
        if (owner)
            owner->modifiedStyleSheet(parentSheet, RecalcStyleDeferred, FullStyleUpdate);
    }
}

void InspectorCSSAgent::activeStyleSheetsUpdated(Document* document)
{
    if (styleSheetEditInProgress())
        return;
    m_invalidatedDocuments.add(document);
    if (m_creatingViaInspectorStyleSheet)
        flushPendingFrontendMessages();
}

void InspectorCSSAgent::updateActiveStyleSheets(Document* document, StyleSheetsUpdateType styleSheetsUpdateType)
{
    Vector<CSSStyleSheet*> newSheetsVector;
    collectAllDocumentStyleSheets(document, newSheetsVector);
    setActiveStyleSheets(document, newSheetsVector, styleSheetsUpdateType);
}

void InspectorCSSAgent::setActiveStyleSheets(Document* document, const Vector<CSSStyleSheet*>& allSheetsVector, StyleSheetsUpdateType styleSheetsUpdateType)
{
    bool isInitialFrontendLoad = styleSheetsUpdateType == InitialFrontendLoad;

    HashSet<CSSStyleSheet*>* documentCSSStyleSheets = m_documentToCSSStyleSheets.get(document);
    if (!documentCSSStyleSheets) {
        documentCSSStyleSheets = new HashSet<CSSStyleSheet*>();
        OwnPtr<HashSet<CSSStyleSheet*> > documentCSSStyleSheetsPtr = adoptPtr(documentCSSStyleSheets);
        m_documentToCSSStyleSheets.set(document, documentCSSStyleSheetsPtr.release());
    }

    HashSet<CSSStyleSheet*> removedSheets(*documentCSSStyleSheets);

    HashSet<CSSStyleSheet*> addedSheets;
    for (Vector<CSSStyleSheet*>::const_iterator it = allSheetsVector.begin(); it != allSheetsVector.end(); ++it) {
        CSSStyleSheet* cssStyleSheet = *it;
        if (removedSheets.contains(cssStyleSheet)) {
            removedSheets.remove(cssStyleSheet);
            if (isInitialFrontendLoad)
                addedSheets.add(cssStyleSheet);
        } else {
            addedSheets.add(cssStyleSheet);
        }
    }

    for (HashSet<CSSStyleSheet*>::iterator it = removedSheets.begin(); it != removedSheets.end(); ++it) {
        CSSStyleSheet* cssStyleSheet = *it;
        RefPtr<InspectorStyleSheet> inspectorStyleSheet = m_cssStyleSheetToInspectorStyleSheet.get(cssStyleSheet);
        ASSERT(inspectorStyleSheet);

        documentCSSStyleSheets->remove(cssStyleSheet);
        if (m_idToInspectorStyleSheet.contains(inspectorStyleSheet->id())) {
            String id = unbindStyleSheet(inspectorStyleSheet.get());
            if (m_frontend && !isInitialFrontendLoad)
                m_frontend->styleSheetRemoved(id);
        }
    }

    for (HashSet<CSSStyleSheet*>::iterator it = addedSheets.begin(); it != addedSheets.end(); ++it) {
        CSSStyleSheet* cssStyleSheet = *it;
        bool isNew = isInitialFrontendLoad || !m_cssStyleSheetToInspectorStyleSheet.contains(cssStyleSheet);
        if (isNew) {
            InspectorStyleSheet* newStyleSheet = bindStyleSheet(cssStyleSheet);
            documentCSSStyleSheets->add(cssStyleSheet);
            if (m_frontend)
                m_frontend->styleSheetAdded(newStyleSheet->buildObjectForStyleSheetInfo());
        }
    }

    if (documentCSSStyleSheets->isEmpty())
        m_documentToCSSStyleSheets.remove(document);
}

void InspectorCSSAgent::documentDetached(Document* document)
{
    m_invalidatedDocuments.remove(document);
    setActiveStyleSheets(document, Vector<CSSStyleSheet*>(), ExistingFrontendRefresh);
}

bool InspectorCSSAgent::forcePseudoState(Element* element, CSSSelector::PseudoType pseudoType)
{
    if (m_nodeIdToForcedPseudoState.isEmpty())
        return false;

    int nodeId = m_domAgent->boundNodeId(element);
    if (!nodeId)
        return false;

    NodeIdToForcedPseudoState::iterator it = m_nodeIdToForcedPseudoState.find(nodeId);
    if (it == m_nodeIdToForcedPseudoState.end())
        return false;

    unsigned forcedPseudoState = it->value;
    switch (pseudoType) {
    case CSSSelector::PseudoActive:
        return forcedPseudoState & PseudoActive;
    case CSSSelector::PseudoFocus:
        return forcedPseudoState & PseudoFocus;
    case CSSSelector::PseudoHover:
        return forcedPseudoState & PseudoHover;
    case CSSSelector::PseudoVisited:
        return forcedPseudoState & PseudoVisited;
    default:
        return false;
    }
}

void InspectorCSSAgent::getMatchedStylesForNode(ErrorString* errorString, int nodeId, const bool* includePseudo, const bool* includeInherited, RefPtr<TypeBuilder::Array<TypeBuilder::CSS::RuleMatch> >& matchedCSSRules, RefPtr<TypeBuilder::Array<TypeBuilder::CSS::PseudoIdMatches> >& pseudoIdMatches, RefPtr<TypeBuilder::Array<TypeBuilder::CSS::InheritedStyleEntry> >& inheritedEntries)
{
    Element* element = elementForId(errorString, nodeId);
    if (!element)
        return;

    Element* originalElement = element;
    PseudoId elementPseudoId = element->pseudoId();
    if (elementPseudoId)
        element = element->parentOrShadowHostElement();

    Document* ownerDocument = element->ownerDocument();
    // A non-active document has no styles.
    if (!ownerDocument->isActive())
        return;

    // FIXME: It's really gross for the inspector to reach in and access StyleResolver
    // directly here. We need to provide the Inspector better APIs to get this information
    // without grabbing at internal style classes!

    // Matched rules.
    StyleResolver& styleResolver = ownerDocument->ensureStyleResolver();

    RefPtrWillBeRawPtr<CSSRuleList> matchedRules = styleResolver.pseudoCSSRulesForElement(element, elementPseudoId, StyleResolver::AllCSSRules);
    matchedCSSRules = buildArrayForMatchedRuleList(matchedRules.get(), originalElement);

    // Pseudo elements.
    if (!elementPseudoId && (!includePseudo || *includePseudo)) {
        RefPtr<TypeBuilder::Array<TypeBuilder::CSS::PseudoIdMatches> > pseudoElements = TypeBuilder::Array<TypeBuilder::CSS::PseudoIdMatches>::create();
        for (PseudoId pseudoId = FIRST_PUBLIC_PSEUDOID; pseudoId < AFTER_LAST_INTERNAL_PSEUDOID; pseudoId = static_cast<PseudoId>(pseudoId + 1)) {
            RefPtrWillBeRawPtr<CSSRuleList> matchedRules = styleResolver.pseudoCSSRulesForElement(element, pseudoId, StyleResolver::AllCSSRules);
            if (matchedRules && matchedRules->length()) {
                RefPtr<TypeBuilder::CSS::PseudoIdMatches> matches = TypeBuilder::CSS::PseudoIdMatches::create()
                    .setPseudoId(static_cast<int>(pseudoId))
                    .setMatches(buildArrayForMatchedRuleList(matchedRules.get(), element));
                pseudoElements->addItem(matches.release());
            }
        }

        pseudoIdMatches = pseudoElements.release();
    }

    // Inherited styles.
    if (!elementPseudoId && (!includeInherited || *includeInherited)) {
        RefPtr<TypeBuilder::Array<TypeBuilder::CSS::InheritedStyleEntry> > entries = TypeBuilder::Array<TypeBuilder::CSS::InheritedStyleEntry>::create();
        Element* parentElement = element->parentElement();
        while (parentElement) {
            StyleResolver& parentStyleResolver = parentElement->ownerDocument()->ensureStyleResolver();
            RefPtrWillBeRawPtr<CSSRuleList> parentMatchedRules = parentStyleResolver.cssRulesForElement(parentElement, StyleResolver::AllCSSRules);
            RefPtr<TypeBuilder::CSS::InheritedStyleEntry> entry = TypeBuilder::CSS::InheritedStyleEntry::create()
                .setMatchedCSSRules(buildArrayForMatchedRuleList(parentMatchedRules.get(), parentElement));
            if (parentElement->style() && parentElement->style()->length()) {
                InspectorStyleSheetForInlineStyle* styleSheet = asInspectorStyleSheet(parentElement);
                if (styleSheet)
                    entry->setInlineStyle(styleSheet->buildObjectForStyle(styleSheet->styleForId(InspectorCSSId(styleSheet->id(), 0))));
            }

            entries->addItem(entry.release());
            parentElement = parentElement->parentElement();
        }

        inheritedEntries = entries.release();
    }
}

void InspectorCSSAgent::getInlineStylesForNode(ErrorString* errorString, int nodeId, RefPtr<TypeBuilder::CSS::CSSStyle>& inlineStyle, RefPtr<TypeBuilder::CSS::CSSStyle>& attributesStyle)
{
    Element* element = elementForId(errorString, nodeId);
    if (!element)
        return;

    InspectorStyleSheetForInlineStyle* styleSheet = asInspectorStyleSheet(element);
    if (!styleSheet)
        return;

    inlineStyle = styleSheet->buildObjectForStyle(element->style());
    RefPtr<TypeBuilder::CSS::CSSStyle> attributes = buildObjectForAttributesStyle(element);
    attributesStyle = attributes ? attributes.release() : nullptr;
}

void InspectorCSSAgent::getComputedStyleForNode(ErrorString* errorString, int nodeId, RefPtr<TypeBuilder::Array<TypeBuilder::CSS::CSSComputedStyleProperty> >& style)
{
    Node* node = m_domAgent->assertNode(errorString, nodeId);
    if (!node)
        return;

    RefPtr<CSSComputedStyleDeclaration> computedStyleInfo = CSSComputedStyleDeclaration::create(node, true);
    RefPtr<InspectorStyle> inspectorStyle = InspectorStyle::create(InspectorCSSId(), computedStyleInfo, 0);
    style = inspectorStyle->buildArrayForComputedStyle();
}

void InspectorCSSAgent::collectPlatformFontsForRenderer(RenderText* renderer, HashCountedSet<String>* fontStats)
{
    for (InlineTextBox* box = renderer->firstTextBox(); box; box = box->nextTextBox()) {
        RenderStyle* style = renderer->style(box->isFirstLineStyle());
        const Font& font = style->font();
        TextRun run = box->constructTextRunForInspector(style, font);
        WidthIterator it(&font, run, 0, false);
        GlyphBuffer glyphBuffer;
        it.advance(run.length(), &glyphBuffer);
        for (unsigned i = 0; i < glyphBuffer.size(); ++i) {
            String familyName = glyphBuffer.fontDataAt(i)->platformData().fontFamilyName();
            if (familyName.isNull())
                familyName = "";
            fontStats->add(familyName);
        }
    }
}

void InspectorCSSAgent::getPlatformFontsForNode(ErrorString* errorString, int nodeId,
    String* cssFamilyName, RefPtr<TypeBuilder::Array<TypeBuilder::CSS::PlatformFontUsage> >& platformFonts)
{
    Node* node = m_domAgent->assertNode(errorString, nodeId);
    if (!node)
        return;

    RefPtr<CSSComputedStyleDeclaration> computedStyleInfo = CSSComputedStyleDeclaration::create(node, true);
    *cssFamilyName = computedStyleInfo->getPropertyValue(CSSPropertyFontFamily);

    Vector<Node*> textNodes;
    if (node->nodeType() == Node::TEXT_NODE) {
        if (node->renderer())
            textNodes.append(node);
    } else {
        for (Node* child = node->firstChild(); child; child = child->nextSibling()) {
            if (child->nodeType() == Node::TEXT_NODE && child->renderer())
                textNodes.append(child);
        }
    }

    HashCountedSet<String> fontStats;
    for (size_t i = 0; i < textNodes.size(); ++i) {
        RenderText* renderer = toRenderText(textNodes[i]->renderer());
        collectPlatformFontsForRenderer(renderer, &fontStats);
        if (renderer->isTextFragment()) {
            RenderTextFragment* textFragment = toRenderTextFragment(renderer);
            if (textFragment->firstLetter()) {
                RenderObject* firstLetter = textFragment->firstLetter();
                for (RenderObject* current = firstLetter->firstChild(); current; current = current->nextSibling()) {
                    if (current->isText())
                        collectPlatformFontsForRenderer(toRenderText(current), &fontStats);
                }
            }
        }
    }

    platformFonts = TypeBuilder::Array<TypeBuilder::CSS::PlatformFontUsage>::create();
    for (HashCountedSet<String>::iterator it = fontStats.begin(), end = fontStats.end(); it != end; ++it) {
        RefPtr<TypeBuilder::CSS::PlatformFontUsage> platformFont = TypeBuilder::CSS::PlatformFontUsage::create()
            .setFamilyName(it->key)
            .setGlyphCount(it->value);
        platformFonts->addItem(platformFont);
    }
}

void InspectorCSSAgent::getStyleSheetText(ErrorString* errorString, const String& styleSheetId, String* result)
{
    InspectorStyleSheetBase* inspectorStyleSheet = assertStyleSheetForId(errorString, styleSheetId);
    if (!inspectorStyleSheet)
        return;

    inspectorStyleSheet->getText(result);
}

void InspectorCSSAgent::setStyleSheetText(ErrorString* errorString, const String& styleSheetId, const String& text)
{
    InspectorStyleSheetBase* inspectorStyleSheet = assertStyleSheetForId(errorString, styleSheetId);
    if (!inspectorStyleSheet) {
        *errorString = "Style sheet with id " + styleSheetId + " not found";
        return;
    }

    TrackExceptionState exceptionState;
    m_domAgent->history()->perform(adoptRef(new SetStyleSheetTextAction(inspectorStyleSheet, text)), exceptionState);
    *errorString = InspectorDOMAgent::toErrorString(exceptionState);
}

static bool extractRangeComponent(ErrorString* errorString, const RefPtr<JSONObject>& range, const String& component, unsigned& result)
{
    int parsedValue;
    if (!range->getNumber(component, &parsedValue) || parsedValue < 0) {
        *errorString = "range." + component + " must be a non-negative integer";
        return false;
    }
    result = parsedValue;
    return true;
}

static bool jsonRangeToSourceRange(ErrorString* errorString, InspectorStyleSheetBase* inspectorStyleSheet, const RefPtr<JSONObject>& range, SourceRange* sourceRange)
{
    unsigned startLineNumber;
    unsigned startColumn;
    unsigned endLineNumber;
    unsigned endColumn;
    if (!extractRangeComponent(errorString, range, "startLine", startLineNumber)
        || !extractRangeComponent(errorString, range, "startColumn", startColumn)
        || !extractRangeComponent(errorString, range, "endLine", endLineNumber)
        || !extractRangeComponent(errorString, range, "endColumn", endColumn))
        return false;

    unsigned startOffset;
    unsigned endOffset;
    bool success = inspectorStyleSheet->lineNumberAndColumnToOffset(startLineNumber, startColumn, &startOffset)
        && inspectorStyleSheet->lineNumberAndColumnToOffset(endLineNumber, endColumn, &endOffset);
    if (!success) {
        *errorString = "Specified range is out of bounds";
        return false;
    }

    if (startOffset > endOffset) {
        *errorString = "Range start must not succeed its end";
        return false;
    }
    sourceRange->start = startOffset;
    sourceRange->end = endOffset;
    return true;
}

void InspectorCSSAgent::setPropertyText(ErrorString* errorString, const String& styleSheetId, const RefPtr<JSONObject>& range, const String& text, RefPtr<TypeBuilder::CSS::CSSStyle>& result)
{
    InspectorStyleSheetBase* inspectorStyleSheet = assertStyleSheetForId(errorString, styleSheetId);
    if (!inspectorStyleSheet)
        return;
    SourceRange propertyRange;
    if (!jsonRangeToSourceRange(errorString, inspectorStyleSheet, range, &propertyRange))
        return;
    InspectorCSSId compoundId;
    unsigned propertyIndex;
    bool overwrite;
    if (!inspectorStyleSheet->findPropertyByRange(propertyRange, &compoundId, &propertyIndex, &overwrite)) {
        *errorString = "Source range didn't match any existing property source range nor any property insertion point";
        return;
    }

    TrackExceptionState exceptionState;
    bool success = m_domAgent->history()->perform(adoptRef(new SetPropertyTextAction(inspectorStyleSheet, compoundId, propertyIndex, text, overwrite)), exceptionState);
    if (success)
        result = inspectorStyleSheet->buildObjectForStyle(inspectorStyleSheet->styleForId(compoundId));
    *errorString = InspectorDOMAgent::toErrorString(exceptionState);
}

void InspectorCSSAgent::setRuleSelector(ErrorString* errorString, const RefPtr<JSONObject>& fullRuleId, const String& selector, RefPtr<TypeBuilder::CSS::CSSRule>& result)
{
    InspectorCSSId compoundId(fullRuleId);
    ASSERT(!compoundId.isEmpty());

    InspectorStyleSheet* inspectorStyleSheet = assertInspectorStyleSheetForId(errorString, compoundId.styleSheetId());
    if (!inspectorStyleSheet)
        return;

    TrackExceptionState exceptionState;
    bool success = m_domAgent->history()->perform(adoptRef(new SetRuleSelectorAction(inspectorStyleSheet, compoundId, selector)), exceptionState);

    if (success) {
        CSSStyleRule* rule = inspectorStyleSheet->ruleForId(compoundId);
        result = inspectorStyleSheet->buildObjectForRule(rule, buildMediaListChain(rule));
    }
    *errorString = InspectorDOMAgent::toErrorString(exceptionState);
}

void InspectorCSSAgent::createStyleSheet(ErrorString* errorString, const String& frameId, TypeBuilder::CSS::StyleSheetId* outStyleSheetId)
{
    LocalFrame* frame = m_pageAgent->frameForId(frameId);
    if (!frame) {
        *errorString = "Frame not found";
        return;
    }

    Document* document = frame->document();
    if (!document) {
        *errorString = "Frame does not have a document";
        return;
    }

    InspectorStyleSheet* inspectorStyleSheet = viaInspectorStyleSheet(document, true);
    if (!inspectorStyleSheet) {
        *errorString = "No target stylesheet found";
        return;
    }

    updateActiveStyleSheets(document, ExistingFrontendRefresh);

    *outStyleSheetId = inspectorStyleSheet->id();
}

void InspectorCSSAgent::addRule(ErrorString* errorString, const String& styleSheetId, const String& selector, RefPtr<TypeBuilder::CSS::CSSRule>& result)
{
    InspectorStyleSheet* inspectorStyleSheet = assertInspectorStyleSheetForId(errorString, styleSheetId);
    if (!inspectorStyleSheet)
        return;

    TrackExceptionState exceptionState;
    RefPtr<AddRuleAction> action = adoptRef(new AddRuleAction(inspectorStyleSheet, selector));
    bool success = m_domAgent->history()->perform(action, exceptionState);
    if (!success) {
        *errorString = InspectorDOMAgent::toErrorString(exceptionState);
        return;
    }

    InspectorCSSId ruleId = action->newRuleId();
    CSSStyleRule* rule = inspectorStyleSheet->ruleForId(ruleId);
    result = inspectorStyleSheet->buildObjectForRule(rule, buildMediaListChain(rule));
}

void InspectorCSSAgent::forcePseudoState(ErrorString* errorString, int nodeId, const RefPtr<JSONArray>& forcedPseudoClasses)
{
    Element* element = m_domAgent->assertElement(errorString, nodeId);
    if (!element)
        return;

    unsigned forcedPseudoState = computePseudoClassMask(forcedPseudoClasses.get());
    NodeIdToForcedPseudoState::iterator it = m_nodeIdToForcedPseudoState.find(nodeId);
    unsigned currentForcedPseudoState = it == m_nodeIdToForcedPseudoState.end() ? 0 : it->value;
    bool needStyleRecalc = forcedPseudoState != currentForcedPseudoState;
    if (!needStyleRecalc)
        return;

    if (forcedPseudoState)
        m_nodeIdToForcedPseudoState.set(nodeId, forcedPseudoState);
    else
        m_nodeIdToForcedPseudoState.remove(nodeId);
    element->ownerDocument()->setNeedsStyleRecalc(SubtreeStyleChange);
}

PassRefPtr<TypeBuilder::CSS::CSSMedia> InspectorCSSAgent::buildMediaObject(const MediaList* media, MediaListSource mediaListSource, const String& sourceURL, CSSStyleSheet* parentStyleSheet)
{
    // Make certain compilers happy by initializing |source| up-front.
    TypeBuilder::CSS::CSSMedia::Source::Enum source = TypeBuilder::CSS::CSSMedia::Source::InlineSheet;
    switch (mediaListSource) {
    case MediaListSourceMediaRule:
        source = TypeBuilder::CSS::CSSMedia::Source::MediaRule;
        break;
    case MediaListSourceImportRule:
        source = TypeBuilder::CSS::CSSMedia::Source::ImportRule;
        break;
    case MediaListSourceLinkedSheet:
        source = TypeBuilder::CSS::CSSMedia::Source::LinkedSheet;
        break;
    case MediaListSourceInlineSheet:
        source = TypeBuilder::CSS::CSSMedia::Source::InlineSheet;
        break;
    }

    RefPtr<TypeBuilder::CSS::CSSMedia> mediaObject = TypeBuilder::CSS::CSSMedia::create()
        .setText(media->mediaText())
        .setSource(source);

    if (parentStyleSheet && mediaListSource != MediaListSourceLinkedSheet) {
        if (InspectorStyleSheet* inspectorStyleSheet = m_cssStyleSheetToInspectorStyleSheet.get(parentStyleSheet))
            mediaObject->setParentStyleSheetId(inspectorStyleSheet->id());
    }
    if (!sourceURL.isEmpty()) {
        mediaObject->setSourceURL(sourceURL);

        CSSRule* parentRule = media->parentRule();
        if (!parentRule)
            return mediaObject.release();
        InspectorStyleSheet* inspectorStyleSheet = bindStyleSheet(parentRule->parentStyleSheet());
        RefPtr<TypeBuilder::CSS::SourceRange> mediaRange = inspectorStyleSheet->ruleHeaderSourceRange(parentRule);
        if (mediaRange)
            mediaObject->setRange(mediaRange);
    }
    return mediaObject.release();
}

PassRefPtr<TypeBuilder::Array<TypeBuilder::CSS::CSSMedia> > InspectorCSSAgent::buildMediaListChain(CSSRule* rule)
{
    if (!rule)
        return nullptr;
    RefPtr<TypeBuilder::Array<TypeBuilder::CSS::CSSMedia> > mediaArray = TypeBuilder::Array<TypeBuilder::CSS::CSSMedia>::create();
    bool hasItems = false;
    MediaList* mediaList;
    CSSRule* parentRule = rule;
    String sourceURL;
    while (parentRule) {
        CSSStyleSheet* parentStyleSheet = 0;
        bool isMediaRule = true;
        if (parentRule->type() == CSSRule::MEDIA_RULE) {
            CSSMediaRule* mediaRule = toCSSMediaRule(parentRule);
            mediaList = mediaRule->media();
            parentStyleSheet = mediaRule->parentStyleSheet();
        } else if (parentRule->type() == CSSRule::IMPORT_RULE) {
            CSSImportRule* importRule = toCSSImportRule(parentRule);
            mediaList = importRule->media();
            parentStyleSheet = importRule->parentStyleSheet();
            isMediaRule = false;
        } else {
            mediaList = 0;
        }

        if (parentStyleSheet) {
            sourceURL = parentStyleSheet->contents()->baseURL();
            if (sourceURL.isEmpty())
                sourceURL = InspectorDOMAgent::documentURLString(parentStyleSheet->ownerDocument());
        } else {
            sourceURL = "";
        }

        if (mediaList && mediaList->length()) {
            mediaArray->addItem(buildMediaObject(mediaList, isMediaRule ? MediaListSourceMediaRule : MediaListSourceImportRule, sourceURL, parentStyleSheet));
            hasItems = true;
        }

        if (parentRule->parentRule()) {
            parentRule = parentRule->parentRule();
        } else {
            CSSStyleSheet* styleSheet = parentRule->parentStyleSheet();
            while (styleSheet) {
                mediaList = styleSheet->media();
                if (mediaList && mediaList->length()) {
                    Document* doc = styleSheet->ownerDocument();
                    if (doc)
                        sourceURL = doc->url();
                    else if (!styleSheet->contents()->baseURL().isEmpty())
                        sourceURL = styleSheet->contents()->baseURL();
                    else
                        sourceURL = "";
                    mediaArray->addItem(buildMediaObject(mediaList, styleSheet->ownerNode() ? MediaListSourceLinkedSheet : MediaListSourceInlineSheet, sourceURL, styleSheet));
                    hasItems = true;
                }
                parentRule = styleSheet->ownerRule();
                if (parentRule)
                    break;
                styleSheet = styleSheet->parentStyleSheet();
            }
        }
    }
    return hasItems ? mediaArray : nullptr;
}

InspectorStyleSheetForInlineStyle* InspectorCSSAgent::asInspectorStyleSheet(Element* element)
{
    NodeToInspectorStyleSheet::iterator it = m_nodeToInspectorStyleSheet.find(element);
    if (it != m_nodeToInspectorStyleSheet.end())
        return it->value.get();

    CSSStyleDeclaration* style = element->isStyledElement() ? element->style() : 0;
    if (!style)
        return 0;

    String newStyleSheetId = String::number(m_lastStyleSheetId++);
    RefPtr<InspectorStyleSheetForInlineStyle> inspectorStyleSheet = InspectorStyleSheetForInlineStyle::create(newStyleSheetId, element, this);
    m_idToInspectorStyleSheetForInlineStyle.set(newStyleSheetId, inspectorStyleSheet);
    m_nodeToInspectorStyleSheet.set(element, inspectorStyleSheet);
    return inspectorStyleSheet.get();
}

Element* InspectorCSSAgent::elementForId(ErrorString* errorString, int nodeId)
{
    Node* node = m_domAgent->nodeForId(nodeId);
    if (!node) {
        *errorString = "No node with given id found";
        return 0;
    }
    if (!node->isElementNode()) {
        *errorString = "Not an element node";
        return 0;
    }
    return toElement(node);
}

void InspectorCSSAgent::collectAllStyleSheets(Vector<InspectorStyleSheet*>& result)
{
    Vector<CSSStyleSheet*> cssStyleSheets;
    Vector<Document*> documents = m_domAgent->documents();
    for (Vector<Document*>::iterator it = documents.begin(); it != documents.end(); ++it)
        collectAllDocumentStyleSheets(*it, cssStyleSheets);
    for (Vector<CSSStyleSheet*>::iterator it = cssStyleSheets.begin(); it != cssStyleSheets.end(); ++it)
        result.append(bindStyleSheet(*it));
}

void InspectorCSSAgent::collectAllDocumentStyleSheets(Document* document, Vector<CSSStyleSheet*>& result)
{
    const WillBeHeapVector<RefPtrWillBeMember<StyleSheet> > activeStyleSheets = document->styleEngine()->activeStyleSheetsForInspector();
    for (WillBeHeapVector<RefPtrWillBeMember<StyleSheet> >::const_iterator it = activeStyleSheets.begin(); it != activeStyleSheets.end(); ++it) {
        StyleSheet* styleSheet = (*it).get();
        if (styleSheet->isCSSStyleSheet())
            collectStyleSheets(toCSSStyleSheet(styleSheet), result);
    }
}

void InspectorCSSAgent::collectStyleSheets(CSSStyleSheet* styleSheet, Vector<CSSStyleSheet*>& result)
{
    result.append(styleSheet);
    for (unsigned i = 0, size = styleSheet->length(); i < size; ++i) {
        CSSRule* rule = styleSheet->item(i);
        if (rule->type() == CSSRule::IMPORT_RULE) {
            CSSStyleSheet* importedStyleSheet = toCSSImportRule(rule)->styleSheet();
            if (importedStyleSheet)
                collectStyleSheets(importedStyleSheet, result);
        }
    }
}

InspectorStyleSheet* InspectorCSSAgent::bindStyleSheet(CSSStyleSheet* styleSheet)
{
    RefPtr<InspectorStyleSheet> inspectorStyleSheet = m_cssStyleSheetToInspectorStyleSheet.get(styleSheet);
    if (!inspectorStyleSheet) {
        String id = String::number(m_lastStyleSheetId++);
        Document* document = styleSheet->ownerDocument();
        inspectorStyleSheet = InspectorStyleSheet::create(m_pageAgent, m_resourceAgent, id, styleSheet, detectOrigin(styleSheet, document), InspectorDOMAgent::documentURLString(document), this);
        m_idToInspectorStyleSheet.set(id, inspectorStyleSheet);
        m_cssStyleSheetToInspectorStyleSheet.set(styleSheet, inspectorStyleSheet);
        if (m_creatingViaInspectorStyleSheet)
            m_documentToViaInspectorStyleSheet.add(document, inspectorStyleSheet);
    }
    return inspectorStyleSheet.get();
}

String InspectorCSSAgent::unbindStyleSheet(InspectorStyleSheet* inspectorStyleSheet)
{
    String id = inspectorStyleSheet->id();
    m_idToInspectorStyleSheet.remove(id);
    if (inspectorStyleSheet->pageStyleSheet())
        m_cssStyleSheetToInspectorStyleSheet.remove(inspectorStyleSheet->pageStyleSheet());
    return id;
}

InspectorStyleSheet* InspectorCSSAgent::viaInspectorStyleSheet(Document* document, bool createIfAbsent)
{
    if (!document) {
        ASSERT(!createIfAbsent);
        return 0;
    }

    if (!document->isHTMLDocument() && !document->isSVGDocument())
        return 0;

    RefPtr<InspectorStyleSheet> inspectorStyleSheet = m_documentToViaInspectorStyleSheet.get(document);
    if (inspectorStyleSheet || !createIfAbsent)
        return inspectorStyleSheet.get();

    TrackExceptionState exceptionState;
    RefPtr<Element> styleElement = document->createElement("style", exceptionState);
    if (!exceptionState.hadException())
        styleElement->setAttribute("type", "text/css", exceptionState);
    if (!exceptionState.hadException()) {
        ContainerNode* targetNode;
        // HEAD is absent in ImageDocuments, for example.
        if (document->head())
            targetNode = document->head();
        else if (document->body())
            targetNode = document->body();
        else
            return 0;

        InlineStyleOverrideScope overrideScope(document);
        m_creatingViaInspectorStyleSheet = true;
        targetNode->appendChild(styleElement, exceptionState);
        // At this point the added stylesheet will get bound through the updateActiveStyleSheets() invocation.
        // We just need to pick the respective InspectorStyleSheet from m_documentToViaInspectorStyleSheet.
        m_creatingViaInspectorStyleSheet = false;
    }
    if (exceptionState.hadException())
        return 0;

    return m_documentToViaInspectorStyleSheet.get(document);
}

InspectorStyleSheet* InspectorCSSAgent::assertInspectorStyleSheetForId(ErrorString* errorString, const String& styleSheetId)
{
    IdToInspectorStyleSheet::iterator it = m_idToInspectorStyleSheet.find(styleSheetId);
    if (it == m_idToInspectorStyleSheet.end()) {
        *errorString = "No style sheet with given id found";
        return 0;
    }
    return it->value.get();
}

InspectorStyleSheetBase* InspectorCSSAgent::assertStyleSheetForId(ErrorString* errorString, const String& styleSheetId)
{
    String placeholder;
    InspectorStyleSheetBase* result = assertInspectorStyleSheetForId(&placeholder, styleSheetId);
    if (result)
        return result;
    IdToInspectorStyleSheetForInlineStyle::iterator it = m_idToInspectorStyleSheetForInlineStyle.find(styleSheetId);
    if (it == m_idToInspectorStyleSheetForInlineStyle.end()) {
        *errorString = "No style sheet with given id found";
        return 0;
    }
    return it->value.get();
}

TypeBuilder::CSS::StyleSheetOrigin::Enum InspectorCSSAgent::detectOrigin(CSSStyleSheet* pageStyleSheet, Document* ownerDocument)
{
    if (m_creatingViaInspectorStyleSheet)
        return TypeBuilder::CSS::StyleSheetOrigin::Inspector;

    TypeBuilder::CSS::StyleSheetOrigin::Enum origin = TypeBuilder::CSS::StyleSheetOrigin::Regular;
    if (pageStyleSheet && !pageStyleSheet->ownerNode() && pageStyleSheet->href().isEmpty())
        origin = TypeBuilder::CSS::StyleSheetOrigin::User_agent;
    else if (pageStyleSheet && pageStyleSheet->ownerNode() && pageStyleSheet->ownerNode()->isDocumentNode())
        origin = TypeBuilder::CSS::StyleSheetOrigin::User;
    else {
        InspectorStyleSheet* viaInspectorStyleSheetForOwner = viaInspectorStyleSheet(ownerDocument, false);
        if (viaInspectorStyleSheetForOwner && pageStyleSheet == viaInspectorStyleSheetForOwner->pageStyleSheet())
            origin = TypeBuilder::CSS::StyleSheetOrigin::Inspector;
    }
    return origin;
}

PassRefPtr<TypeBuilder::CSS::CSSRule> InspectorCSSAgent::buildObjectForRule(CSSStyleRule* rule)
{
    if (!rule)
        return nullptr;

    // CSSRules returned by StyleResolver::pseudoCSSRulesForElement lack parent pointers if they are coming from
    // user agent stylesheets. To work around this issue, we use CSSOM wrapper created by inspector.
    if (!rule->parentStyleSheet()) {
        if (!m_inspectorUserAgentStyleSheet)
            m_inspectorUserAgentStyleSheet = CSSStyleSheet::create(CSSDefaultStyleSheets::instance().defaultStyleSheet());
        rule->setParentStyleSheet(m_inspectorUserAgentStyleSheet.get());
    }
    return bindStyleSheet(rule->parentStyleSheet())->buildObjectForRule(rule, buildMediaListChain(rule));
}

static inline bool matchesPseudoElement(const CSSSelector* selector, PseudoId elementPseudoId)
{
    // According to http://www.w3.org/TR/css3-selectors/#pseudo-elements, "Only one pseudo-element may appear per selector."
    // As such, check the last selector in the tag history.
    for (; !selector->isLastInTagHistory(); ++selector) { }
    PseudoId selectorPseudoId = selector->matchesPseudoElement() ? CSSSelector::pseudoId(selector->pseudoType()) : NOPSEUDO;

    // FIXME: This only covers the case of matching pseudo-element selectors against PseudoElements.
    // We should come up with a solution for matching pseudo-element selectors against ordinary Elements, too.
    return selectorPseudoId == elementPseudoId;
}

PassRefPtr<TypeBuilder::Array<TypeBuilder::CSS::RuleMatch> > InspectorCSSAgent::buildArrayForMatchedRuleList(CSSRuleList* ruleList, Element* element)
{
    RefPtr<TypeBuilder::Array<TypeBuilder::CSS::RuleMatch> > result = TypeBuilder::Array<TypeBuilder::CSS::RuleMatch>::create();
    if (!ruleList)
        return result.release();

    for (unsigned i = 0, size = ruleList->length(); i < size; ++i) {
        CSSStyleRule* rule = asCSSStyleRule(ruleList->item(i));
        RefPtr<TypeBuilder::CSS::CSSRule> ruleObject = buildObjectForRule(rule);
        if (!ruleObject)
            continue;
        RefPtr<TypeBuilder::Array<int> > matchingSelectors = TypeBuilder::Array<int>::create();
        const CSSSelectorList& selectorList = rule->styleRule()->selectorList();
        long index = 0;
        PseudoId elementPseudoId = element->pseudoId();
        for (const CSSSelector* selector = selectorList.first(); selector; selector = CSSSelectorList::next(*selector)) {
            const CSSSelector* firstTagHistorySelector = selector;
            bool matched = false;
            if (elementPseudoId)
                matched = matchesPseudoElement(selector, elementPseudoId); // Modifies |selector|.
            matched |= element->matches(firstTagHistorySelector->selectorText(), IGNORE_EXCEPTION);
            if (matched)
                matchingSelectors->addItem(index);
            ++index;
        }
        RefPtr<TypeBuilder::CSS::RuleMatch> match = TypeBuilder::CSS::RuleMatch::create()
            .setRule(ruleObject.release())
            .setMatchingSelectors(matchingSelectors.release());
        result->addItem(match);
    }

    return result;
}

PassRefPtr<TypeBuilder::CSS::CSSStyle> InspectorCSSAgent::buildObjectForAttributesStyle(Element* element)
{
    if (!element->isStyledElement())
        return nullptr;

    // FIXME: Ugliness below.
    StylePropertySet* attributeStyle = const_cast<StylePropertySet*>(element->presentationAttributeStyle());
    if (!attributeStyle)
        return nullptr;

    MutableStylePropertySet* mutableAttributeStyle = toMutableStylePropertySet(attributeStyle);

    RefPtr<InspectorStyle> inspectorStyle = InspectorStyle::create(InspectorCSSId(), mutableAttributeStyle->ensureCSSStyleDeclaration(), 0);
    return inspectorStyle->buildObjectForStyle();
}

void InspectorCSSAgent::didRemoveDocument(Document* document)
{
    if (document)
        m_documentToViaInspectorStyleSheet.remove(document);
}

void InspectorCSSAgent::didRemoveDOMNode(Node* node)
{
    if (!node)
        return;

    int nodeId = m_domAgent->boundNodeId(node);
    if (nodeId)
        m_nodeIdToForcedPseudoState.remove(nodeId);

    NodeToInspectorStyleSheet::iterator it = m_nodeToInspectorStyleSheet.find(node);
    if (it == m_nodeToInspectorStyleSheet.end())
        return;

    m_idToInspectorStyleSheetForInlineStyle.remove(it->value->id());
    m_nodeToInspectorStyleSheet.remove(node);
}

void InspectorCSSAgent::didModifyDOMAttr(Element* element)
{
    if (!element)
        return;

    NodeToInspectorStyleSheet::iterator it = m_nodeToInspectorStyleSheet.find(element);
    if (it == m_nodeToInspectorStyleSheet.end())
        return;

    it->value->didModifyElementAttribute();
}

void InspectorCSSAgent::styleSheetChanged(InspectorStyleSheetBase* styleSheet)
{
    flushPendingFrontendMessages();
    m_frontend->styleSheetChanged(styleSheet->id());
}

void InspectorCSSAgent::willReparseStyleSheet()
{
    ASSERT(!m_isSettingStyleSheetText);
    m_isSettingStyleSheetText = true;
}

void InspectorCSSAgent::didReparseStyleSheet()
{
    ASSERT(m_isSettingStyleSheetText);
    m_isSettingStyleSheetText = false;
}

void InspectorCSSAgent::resetPseudoStates()
{
    HashSet<Document*> documentsToChange;
    for (NodeIdToForcedPseudoState::iterator it = m_nodeIdToForcedPseudoState.begin(), end = m_nodeIdToForcedPseudoState.end(); it != end; ++it) {
        Element* element = toElement(m_domAgent->nodeForId(it->key));
        if (element && element->ownerDocument())
            documentsToChange.add(element->ownerDocument());
    }

    m_nodeIdToForcedPseudoState.clear();
    for (HashSet<Document*>::iterator it = documentsToChange.begin(), end = documentsToChange.end(); it != end; ++it)
        (*it)->setNeedsStyleRecalc(SubtreeStyleChange);
}

} // namespace WebCore
/* [<][>][^][v][top][bottom][index][help] */
root/Source/core/inspector/InspectorCSSAgent.cpp

DEFINITIONS
