/*
 * 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 "InspectorStyleSheet.h"

#include "CSSImportRule.h"
#include "CSSKeyframesRule.h"
#include "CSSMediaRule.h"
#include "CSSParser.h"
#include "CSSPropertyNames.h"
#include "CSSPropertySourceData.h"
#include "CSSRule.h"
#include "CSSRuleList.h"
#include "CSSStyleRule.h"
#include "CSSStyleSheet.h"
#include "CSSSupportsRule.h"
#include "ContentSecurityPolicy.h"
#include "Document.h"
#include "Element.h"
#include "HTMLHeadElement.h"
#include "HTMLNames.h"
#include "HTMLParserIdioms.h"
#include "HTMLStyleElement.h"
#include "InspectorCSSAgent.h"
#include "InspectorPageAgent.h"
#include "Node.h"
#include "SVGElement.h"
#include "SVGNames.h"
#include "StyleProperties.h"
#include "StyleResolver.h"
#include "StyleRule.h"
#include "StyleRuleImport.h"
#include "StyleSheetContents.h"
#include "StyleSheetList.h"
#include <inspector/ContentSearchUtilities.h>
#include <wtf/text/StringBuilder.h>
#include <yarr/RegularExpression.h>

using Inspector::Protocol::Array;
using WebCore::RuleSourceDataList;
using WebCore::CSSRuleSourceData;

class ParsedStyleSheet {
    WTF_MAKE_FAST_ALLOCATED;
public:
    ParsedStyleSheet();

    const String& text() const { ASSERT(m_hasText); return m_text; }
    void setText(const String& text);
    bool hasText() const { return m_hasText; }
    RuleSourceDataList* sourceData() const { return m_sourceData.get(); }
    void setSourceData(std::unique_ptr<RuleSourceDataList>);
    bool hasSourceData() const { return m_sourceData != nullptr; }
    RefPtr<WebCore::CSSRuleSourceData> ruleSourceDataAt(unsigned) const;

private:

    String m_text;
    bool m_hasText;
    std::unique_ptr<RuleSourceDataList> m_sourceData;
};

ParsedStyleSheet::ParsedStyleSheet()
    : m_hasText(false)
{
}

void ParsedStyleSheet::setText(const String& text)
{
    m_hasText = true;
    m_text = text;
    setSourceData(nullptr);
}

static void flattenSourceData(RuleSourceDataList* dataList, RuleSourceDataList* target)
{
    for (size_t i = 0; i < dataList->size(); ++i) {
        RefPtr<CSSRuleSourceData>& data = dataList->at(i);
        if (data->type == CSSRuleSourceData::STYLE_RULE)
            target->append(data);
        else if (data->type == CSSRuleSourceData::MEDIA_RULE)
            flattenSourceData(&data->childRules, target);
        else if (data->type == CSSRuleSourceData::SUPPORTS_RULE)
            flattenSourceData(&data->childRules, target);
    }
}

void ParsedStyleSheet::setSourceData(std::unique_ptr<RuleSourceDataList> sourceData)
{
    if (!sourceData) {
        m_sourceData.reset();
        return;
    }

    m_sourceData = std::make_unique<RuleSourceDataList>();

    // FIXME: This is a temporary solution to retain the original flat sourceData structure
    // containing only style rules, even though CSSParser now provides the full rule source data tree.
    // Normally, we should just assign m_sourceData = sourceData;
    flattenSourceData(sourceData.get(), m_sourceData.get());
}

RefPtr<WebCore::CSSRuleSourceData> ParsedStyleSheet::ruleSourceDataAt(unsigned index) const
{
    if (!hasSourceData() || index >= m_sourceData->size())
        return nullptr;

    return m_sourceData->at(index);
}

using namespace Inspector;

namespace WebCore {

enum MediaListSource {
    MediaListSourceLinkedSheet,
    MediaListSourceInlineSheet,
    MediaListSourceMediaRule,
    MediaListSourceImportRule
};

static RefPtr<Inspector::Protocol::CSS::SourceRange> buildSourceRangeObject(const SourceRange& range, Vector<size_t>* lineEndings)
{
    if (!lineEndings)
        return nullptr;
    TextPosition start = ContentSearchUtilities::textPositionFromOffset(range.start, *lineEndings);
    TextPosition end = ContentSearchUtilities::textPositionFromOffset(range.end, *lineEndings);

    return Inspector::Protocol::CSS::SourceRange::create()
        .setStartLine(start.m_line.zeroBasedInt())
        .setStartColumn(start.m_column.zeroBasedInt())
        .setEndLine(end.m_line.zeroBasedInt())
        .setEndColumn(end.m_column.zeroBasedInt())
        .release();
}

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

    auto mediaObject = Inspector::Protocol::CSS::CSSMedia::create()
        .setText(media->mediaText())
        .setSource(source)
        .release();

    if (!sourceURL.isEmpty()) {
        mediaObject->setSourceURL(sourceURL);
        mediaObject->setSourceLine(media->queries()->lastLine());
    }
    return WTF::move(mediaObject);
}

static RefPtr<CSSRuleList> asCSSRuleList(CSSStyleSheet* styleSheet)
{
    if (!styleSheet)
        return nullptr;

    RefPtr<StaticCSSRuleList> list = StaticCSSRuleList::create();
    Vector<RefPtr<CSSRule>>& listRules = list->rules();
    for (unsigned i = 0, size = styleSheet->length(); i < size; ++i) {
        CSSRule* item = styleSheet->item(i);
        if (item->type() == CSSRule::CHARSET_RULE)
            continue;
        listRules.append(item);
    }
    return WTF::move(list);
}

static RefPtr<CSSRuleList> asCSSRuleList(CSSRule* rule)
{
    if (!rule)
        return nullptr;

    if (is<CSSMediaRule>(*rule))
        return &downcast<CSSMediaRule>(*rule).cssRules();

    if (is<CSSKeyframesRule>(*rule))
        return &downcast<CSSKeyframesRule>(*rule).cssRules();

    if (is<CSSSupportsRule>(*rule))
        return &downcast<CSSSupportsRule>(*rule).cssRules();

    return nullptr;
}

static void fillMediaListChain(CSSRule* rule, Array<Inspector::Protocol::CSS::CSSMedia>& mediaArray)
{
    MediaList* mediaList;
    CSSRule* parentRule = rule;
    String sourceURL;
    while (parentRule) {
        CSSStyleSheet* parentStyleSheet = nullptr;
        bool isMediaRule = true;
        if (is<CSSMediaRule>(*parentRule)) {
            CSSMediaRule& mediaRule = downcast<CSSMediaRule>(*parentRule);
            mediaList = mediaRule.media();
            parentStyleSheet = mediaRule.parentStyleSheet();
        } else if (is<CSSImportRule>(*parentRule)) {
            CSSImportRule& importRule = downcast<CSSImportRule>(*parentRule);
            mediaList = &importRule.media();
            parentStyleSheet = importRule.parentStyleSheet();
            isMediaRule = false;
        } else
            mediaList = nullptr;

        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));

        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));
                }
                parentRule = styleSheet->ownerRule();
                if (parentRule)
                    break;
                styleSheet = styleSheet->parentStyleSheet();
            }
        }
    }
}

static std::unique_ptr<CSSParser> createCSSParser(Document* document)
{
    return std::make_unique<CSSParser>(document ? CSSParserContext(*document) : strictCSSParserContext());
}

Ref<InspectorStyle> InspectorStyle::create(const InspectorCSSId& styleId, RefPtr<CSSStyleDeclaration>&& style, InspectorStyleSheet* parentStyleSheet)
{
    return adoptRef(*new InspectorStyle(styleId, WTF::move(style), parentStyleSheet));
}

InspectorStyle::InspectorStyle(const InspectorCSSId& styleId, RefPtr<CSSStyleDeclaration>&& style, InspectorStyleSheet* parentStyleSheet)
    : m_styleId(styleId)
    , m_style(style)
    , m_parentStyleSheet(parentStyleSheet)
{
    ASSERT(m_style);
}

InspectorStyle::~InspectorStyle()
{
}

RefPtr<Inspector::Protocol::CSS::CSSStyle> InspectorStyle::buildObjectForStyle() const
{
    Ref<Inspector::Protocol::CSS::CSSStyle> result = styleWithProperties();
    if (!m_styleId.isEmpty())
        result->setStyleId(m_styleId.asProtocolValue<Inspector::Protocol::CSS::CSSStyleId>());

    result->setWidth(m_style->getPropertyValue("width"));
    result->setHeight(m_style->getPropertyValue("height"));

    RefPtr<CSSRuleSourceData> sourceData = extractSourceData();
    if (sourceData)
        result->setRange(buildSourceRangeObject(sourceData->ruleBodyRange, m_parentStyleSheet->lineEndings().get()));

    return WTF::move(result);
}

Ref<Inspector::Protocol::Array<Inspector::Protocol::CSS::CSSComputedStyleProperty>> InspectorStyle::buildArrayForComputedStyle() const
{
    auto result = Inspector::Protocol::Array<Inspector::Protocol::CSS::CSSComputedStyleProperty>::create();
    Vector<InspectorStyleProperty> properties;
    populateAllProperties(&properties);

    for (Vector<InspectorStyleProperty>::iterator it = properties.begin(), itEnd = properties.end(); it != itEnd; ++it) {
        const CSSPropertySourceData& propertyEntry = it->sourceData;
        auto entry = Inspector::Protocol::CSS::CSSComputedStyleProperty::create()
            .setName(propertyEntry.name)
            .setValue(propertyEntry.value)
            .release();
        result->addItem(WTF::move(entry));
    }

    return WTF::move(result);
}

bool InspectorStyle::getText(String* result) const
{
    // Precondition: m_parentStyleSheet->ensureParsedDataReady() has been called successfully.
    RefPtr<CSSRuleSourceData> sourceData = extractSourceData();
    if (!sourceData)
        return false;

    String styleSheetText;
    bool success = m_parentStyleSheet->getText(&styleSheetText);
    if (!success)
        return false;

    SourceRange& bodyRange = sourceData->ruleBodyRange;
    *result = styleSheetText.substring(bodyRange.start, bodyRange.end - bodyRange.start);
    return true;
}

bool InspectorStyle::populateAllProperties(Vector<InspectorStyleProperty>* result) const
{
    HashSet<String> sourcePropertyNames;

    RefPtr<CSSRuleSourceData> sourceData = extractSourceData();
    Vector<CSSPropertySourceData>* sourcePropertyData = sourceData ? &(sourceData->styleSourceData->propertyData) : nullptr;
    if (sourcePropertyData) {
        String styleDeclaration;
        bool isStyleTextKnown = getText(&styleDeclaration);
        ASSERT_UNUSED(isStyleTextKnown, isStyleTextKnown);
        for (Vector<CSSPropertySourceData>::const_iterator it = sourcePropertyData->begin(); it != sourcePropertyData->end(); ++it) {
            InspectorStyleProperty p(*it, true, false);
            p.setRawTextFromStyleDeclaration(styleDeclaration);
            result->append(p);
            sourcePropertyNames.add(it->name.lower());
        }
    }

    for (int i = 0, size = m_style->length(); i < size; ++i) {
        String name = m_style->item(i);
        if (sourcePropertyNames.contains(name.lower()))
            continue;

        sourcePropertyNames.add(name.lower());
        result->append(InspectorStyleProperty(CSSPropertySourceData(name, m_style->getPropertyValue(name), !m_style->getPropertyPriority(name).isEmpty(), true, SourceRange()), false, false));
    }

    return true;
}

Ref<Inspector::Protocol::CSS::CSSStyle> InspectorStyle::styleWithProperties() const
{
    Vector<InspectorStyleProperty> properties;
    populateAllProperties(&properties);

    auto propertiesObject = Array<Inspector::Protocol::CSS::CSSProperty>::create();
    auto shorthandEntries = Array<Inspector::Protocol::CSS::ShorthandEntry>::create();
    HashMap<String, RefPtr<Inspector::Protocol::CSS::CSSProperty>> propertyNameToPreviousActiveProperty;
    HashSet<String> foundShorthands;
    String previousPriority;
    String previousStatus;
    std::unique_ptr<Vector<size_t>> lineEndings(m_parentStyleSheet ? m_parentStyleSheet->lineEndings() : nullptr);
    RefPtr<CSSRuleSourceData> sourceData = extractSourceData();
    unsigned ruleBodyRangeStart = sourceData ? sourceData->ruleBodyRange.start : 0;

    for (Vector<InspectorStyleProperty>::iterator it = properties.begin(), itEnd = properties.end(); it != itEnd; ++it) {
        const CSSPropertySourceData& propertyEntry = it->sourceData;
        const String& name = propertyEntry.name;

        // Visual Studio disagrees with other compilers as to whether 'class' is needed here.
#if COMPILER(MSVC)
        enum class Protocol::CSS::CSSPropertyStatus status;
#else
        enum Inspector::Protocol::CSS::CSSPropertyStatus status;
#endif
        status = it->disabled ? Inspector::Protocol::CSS::CSSPropertyStatus::Disabled : Inspector::Protocol::CSS::CSSPropertyStatus::Active;

        RefPtr<Inspector::Protocol::CSS::CSSProperty> property = Inspector::Protocol::CSS::CSSProperty::create()
            .setName(name.lower())
            .setValue(propertyEntry.value)
            .release();

        propertiesObject->addItem(property.copyRef());

        // Default "parsedOk" == true.
        if (!propertyEntry.parsedOk)
            property->setParsedOk(false);
        if (it->hasRawText())
            property->setText(it->rawText);

        // Default "priority" == "".
        if (propertyEntry.important)
            property->setPriority("important");
        if (!it->disabled) {
            if (it->hasSource) {
                ASSERT(sourceData);
                property->setImplicit(false);
                // The property range is relative to the style body start.
                // Should be converted into an absolute range (relative to the stylesheet start)
                // for the proper conversion into line:column.
                SourceRange absolutePropertyRange = propertyEntry.range;
                absolutePropertyRange.start += ruleBodyRangeStart;
                absolutePropertyRange.end += ruleBodyRangeStart;
                property->setRange(buildSourceRangeObject(absolutePropertyRange, lineEndings.get()));

                // Parsed property overrides any property with the same name. Non-parsed property overrides
                // previous non-parsed property with the same name (if any).
                bool shouldInactivate = false;
                CSSPropertyID propertyId = cssPropertyID(name);
                // Canonicalize property names to treat non-prefixed and vendor-prefixed property names the same (opacity vs. -webkit-opacity).
                String canonicalPropertyName = propertyId ? getPropertyNameString(propertyId) : name;
                HashMap<String, RefPtr<Inspector::Protocol::CSS::CSSProperty>>::iterator activeIt = propertyNameToPreviousActiveProperty.find(canonicalPropertyName);
                if (activeIt != propertyNameToPreviousActiveProperty.end()) {
                    if (propertyEntry.parsedOk) {
                        bool successPriority = activeIt->value->getString(Inspector::Protocol::CSS::CSSProperty::Priority, previousPriority);
                        bool successStatus = activeIt->value->getString(Inspector::Protocol::CSS::CSSProperty::Status, previousStatus);
                        if (successStatus && previousStatus != "inactive") {
                            if (propertyEntry.important || !successPriority) // Priority not set == "not important".
                                shouldInactivate = true;
                            else if (status == Inspector::Protocol::CSS::CSSPropertyStatus::Active) {
                                // Inactivate a non-important property following the same-named important property.
                                status = Inspector::Protocol::CSS::CSSPropertyStatus::Inactive;
                            }
                        }
                    } else {
                        bool previousParsedOk;
                        bool success = activeIt->value->getBoolean(Inspector::Protocol::CSS::CSSProperty::ParsedOk, previousParsedOk);
                        if (success && !previousParsedOk)
                            shouldInactivate = true;
                    }
                } else
                    propertyNameToPreviousActiveProperty.set(canonicalPropertyName, property);

                if (shouldInactivate) {
                    activeIt->value->setStatus(Inspector::Protocol::CSS::CSSPropertyStatus::Inactive);
                    propertyNameToPreviousActiveProperty.set(canonicalPropertyName, property);
                }
            } else {
                bool implicit = m_style->isPropertyImplicit(name);
                // Default "implicit" == false.
                if (implicit)
                    property->setImplicit(true);
                status = Inspector::Protocol::CSS::CSSPropertyStatus::Style;

                String shorthand = m_style->getPropertyShorthand(name);
                if (!shorthand.isEmpty()) {
                    if (!foundShorthands.contains(shorthand)) {
                        foundShorthands.add(shorthand);
                        auto entry = Inspector::Protocol::CSS::ShorthandEntry::create()
                            .setName(shorthand)
                            .setValue(shorthandValue(shorthand))
                            .release();
                        shorthandEntries->addItem(WTF::move(entry));
                    }
                }
            }
        }

        // Default "status" == "style".
        if (status != Inspector::Protocol::CSS::CSSPropertyStatus::Style)
            property->setStatus(status);
    }

    return Inspector::Protocol::CSS::CSSStyle::create()
        .setCssProperties(WTF::move(propertiesObject))
        .setShorthandEntries(WTF::move(shorthandEntries))
        .release();
}

RefPtr<CSSRuleSourceData> InspectorStyle::extractSourceData() const
{
    if (!m_parentStyleSheet || !m_parentStyleSheet->ensureParsedDataReady())
        return nullptr;
    return m_parentStyleSheet->ruleSourceDataFor(m_style.get());
}

bool InspectorStyle::setText(const String& text, ExceptionCode& ec)
{
    return m_parentStyleSheet->setStyleText(m_style.get(), text, ec);
}

String InspectorStyle::shorthandValue(const String& shorthandProperty) const
{
    String value = m_style->getPropertyValue(shorthandProperty);
    if (!value.isEmpty())
        return value;
    StringBuilder builder;
    for (unsigned i = 0; i < m_style->length(); ++i) {
        String individualProperty = m_style->item(i);
        if (m_style->getPropertyShorthand(individualProperty) != shorthandProperty)
            continue;
        if (m_style->isPropertyImplicit(individualProperty))
            continue;
        String individualValue = m_style->getPropertyValue(individualProperty);
        if (individualValue == "initial")
            continue;
        if (!builder.isEmpty())
            builder.append(' ');
        builder.append(individualValue);
    }
    return builder.toString();
}

String InspectorStyle::shorthandPriority(const String& shorthandProperty) const
{
    String priority = m_style->getPropertyPriority(shorthandProperty);
    if (priority.isEmpty()) {
        for (unsigned i = 0; i < m_style->length(); ++i) {
            String individualProperty = m_style->item(i);
            if (m_style->getPropertyShorthand(individualProperty) != shorthandProperty)
                continue;
            priority = m_style->getPropertyPriority(individualProperty);
            break;
        }
    }
    return priority;
}

Vector<String> InspectorStyle::longhandProperties(const String& shorthandProperty) const
{
    Vector<String> properties;
    HashSet<String> foundProperties;
    for (unsigned i = 0; i < m_style->length(); ++i) {
        String individualProperty = m_style->item(i);
        if (foundProperties.contains(individualProperty) || m_style->getPropertyShorthand(individualProperty) != shorthandProperty)
            continue;

        foundProperties.add(individualProperty);
        properties.append(individualProperty);
    }
    return properties;
}

Ref<InspectorStyleSheet> InspectorStyleSheet::create(InspectorPageAgent* pageAgent, const String& id, RefPtr<CSSStyleSheet>&& pageStyleSheet, Inspector::Protocol::CSS::StyleSheetOrigin origin, const String& documentURL, Listener* listener)
{
    return adoptRef(*new InspectorStyleSheet(pageAgent, id, WTF::move(pageStyleSheet), origin, documentURL, listener));
}

// static
String InspectorStyleSheet::styleSheetURL(CSSStyleSheet* pageStyleSheet)
{
    if (pageStyleSheet && !pageStyleSheet->contents().baseURL().isEmpty())
        return pageStyleSheet->contents().baseURL().string();
    return emptyString();
}

InspectorStyleSheet::InspectorStyleSheet(InspectorPageAgent* pageAgent, const String& id, RefPtr<CSSStyleSheet>&& pageStyleSheet, Inspector::Protocol::CSS::StyleSheetOrigin origin, const String& documentURL, Listener* listener)
    : m_pageAgent(pageAgent)
    , m_id(id)
    , m_pageStyleSheet(WTF::move(pageStyleSheet))
    , m_origin(origin)
    , m_documentURL(documentURL)
    , m_listener(listener)
{
    m_parsedStyleSheet = new ParsedStyleSheet();
}

InspectorStyleSheet::~InspectorStyleSheet()
{
    delete m_parsedStyleSheet;
}

String InspectorStyleSheet::finalURL() const
{
    String url = styleSheetURL(m_pageStyleSheet.get());
    return url.isEmpty() ? m_documentURL : url;
}

void InspectorStyleSheet::reparseStyleSheet(const String& text)
{
    {
        // Have a separate scope for clearRules() (bug 95324).
        CSSStyleSheet::RuleMutationScope mutationScope(m_pageStyleSheet.get());
        m_pageStyleSheet->contents().clearRules();
    }
    {
        CSSStyleSheet::RuleMutationScope mutationScope(m_pageStyleSheet.get());
        m_pageStyleSheet->contents().parseString(text);
        m_pageStyleSheet->clearChildRuleCSSOMWrappers();
        fireStyleSheetChanged();
    }

    // We just wiped the entire contents of the stylesheet. Clear the mutation flag.
    m_pageStyleSheet->clearHadRulesMutation();
}

bool InspectorStyleSheet::setText(const String& text, ExceptionCode& ec)
{
    if (!checkPageStyleSheet(ec))
        return false;
    if (!m_parsedStyleSheet)
        return false;

    m_parsedStyleSheet->setText(text);
    m_flatRules.clear();

    return true;
}

String InspectorStyleSheet::ruleSelector(const InspectorCSSId& id, ExceptionCode& ec)
{
    CSSStyleRule* rule = ruleForId(id);
    if (!rule) {
        ec = NOT_FOUND_ERR;
        return "";
    }
    return rule->selectorText();
}

static bool isValidSelectorListString(const String& selector, Document* document)
{
    CSSSelectorList selectorList;
    createCSSParser(document)->parseSelector(selector, selectorList);
    return selectorList.isValid();
}

bool InspectorStyleSheet::setRuleSelector(const InspectorCSSId& id, const String& selector, ExceptionCode& ec)
{
    if (!checkPageStyleSheet(ec))
        return false;

    // If the selector is invalid, do not proceed any further.
    if (!isValidSelectorListString(selector, m_pageStyleSheet->ownerDocument())) {
        ec = SYNTAX_ERR;
        return false;
    }

    CSSStyleRule* rule = ruleForId(id);
    if (!rule) {
        ec = NOT_FOUND_ERR;
        return false;
    }

    CSSStyleSheet* styleSheet = rule->parentStyleSheet();
    if (!styleSheet || !ensureParsedDataReady()) {
        ec = NOT_FOUND_ERR;
        return false;
    }

    // If the stylesheet is already mutated at this point, that must mean that our data has been modified
    // elsewhere. This should never happen as ensureParsedDataReady would return false in that case.
    ASSERT(!styleSheetMutated());

    rule->setSelectorText(selector);
    RefPtr<CSSRuleSourceData> sourceData = ruleSourceDataFor(&rule->style());
    if (!sourceData) {
        ec = NOT_FOUND_ERR;
        return false;
    }

    String sheetText = m_parsedStyleSheet->text();
    sheetText.replace(sourceData->ruleHeaderRange.start, sourceData->ruleHeaderRange.length(), selector);
    m_parsedStyleSheet->setText(sheetText);
    m_pageStyleSheet->clearHadRulesMutation();
    fireStyleSheetChanged();
    return true;
}

CSSStyleRule* InspectorStyleSheet::addRule(const String& selector, ExceptionCode& ec)
{
    if (!checkPageStyleSheet(ec))
        return nullptr;
    if (!isValidSelectorListString(selector, m_pageStyleSheet->ownerDocument())) {
        ec = SYNTAX_ERR;
        return nullptr;
    }

    String text;
    bool success = getText(&text);
    if (!success) {
        ec = NOT_FOUND_ERR;
        return nullptr;
    }
    StringBuilder styleSheetText;
    styleSheetText.append(text);

    m_pageStyleSheet->addRule(selector, "", ec);
    if (ec)
        return nullptr;
    ASSERT(m_pageStyleSheet->length());
    unsigned lastRuleIndex = m_pageStyleSheet->length() - 1;
    CSSRule* rule = m_pageStyleSheet->item(lastRuleIndex);
    ASSERT(rule);

    CSSStyleRule* styleRule = InspectorCSSAgent::asCSSStyleRule(*rule);
    if (!styleRule) {
        // What we just added has to be a CSSStyleRule - we cannot handle other types of rules yet.
        // If it is not a style rule, pretend we never touched the stylesheet.
        m_pageStyleSheet->deleteRule(lastRuleIndex, ASSERT_NO_EXCEPTION);
        ec = SYNTAX_ERR;
        return nullptr;
    }

    if (!styleSheetText.isEmpty())
        styleSheetText.append('\n');

    styleSheetText.append(selector);
    styleSheetText.appendLiteral(" {}");
    // Using setText() as this operation changes the style sheet rule set.
    setText(styleSheetText.toString(), ASSERT_NO_EXCEPTION);

    fireStyleSheetChanged();

    return styleRule;
}

bool InspectorStyleSheet::deleteRule(const InspectorCSSId& id, ExceptionCode& ec)
{
    if (!checkPageStyleSheet(ec))
        return false;
    RefPtr<CSSStyleRule> rule = ruleForId(id);
    if (!rule) {
        ec = NOT_FOUND_ERR;
        return false;
    }
    CSSStyleSheet* styleSheet = rule->parentStyleSheet();
    if (!styleSheet || !ensureParsedDataReady()) {
        ec = NOT_FOUND_ERR;
        return false;
    }

    RefPtr<CSSRuleSourceData> sourceData = ruleSourceDataFor(&rule->style());
    if (!sourceData) {
        ec = NOT_FOUND_ERR;
        return false;
    }

    styleSheet->deleteRule(id.ordinal(), ec);
    // |rule| MAY NOT be addressed after this line!

    if (ec)
        return false;

    String sheetText = m_parsedStyleSheet->text();
    sheetText.remove(sourceData->ruleHeaderRange.start, sourceData->ruleBodyRange.end - sourceData->ruleHeaderRange.start + 1);
    setText(sheetText, ASSERT_NO_EXCEPTION);
    fireStyleSheetChanged();
    return true;
}

CSSStyleRule* InspectorStyleSheet::ruleForId(const InspectorCSSId& id) const
{
    if (!m_pageStyleSheet)
        return nullptr;

    ASSERT(!id.isEmpty());
    ensureFlatRules();
    return id.ordinal() >= m_flatRules.size() ? nullptr : m_flatRules.at(id.ordinal()).get();
}

RefPtr<Inspector::Protocol::CSS::CSSStyleSheetBody> InspectorStyleSheet::buildObjectForStyleSheet()
{
    CSSStyleSheet* styleSheet = pageStyleSheet();
    if (!styleSheet)
        return nullptr;

    RefPtr<CSSRuleList> cssRuleList = asCSSRuleList(styleSheet);

    auto result = Inspector::Protocol::CSS::CSSStyleSheetBody::create()
        .setStyleSheetId(id())
        .setRules(buildArrayForRuleList(cssRuleList.get()))
        .release();

    String styleSheetText;
    bool success = getText(&styleSheetText);
    if (success)
        result->setText(styleSheetText);

    return WTF::move(result);
}

RefPtr<Inspector::Protocol::CSS::CSSStyleSheetHeader> InspectorStyleSheet::buildObjectForStyleSheetInfo()
{
    CSSStyleSheet* styleSheet = pageStyleSheet();
    if (!styleSheet)
        return nullptr;

    Document* document = styleSheet->ownerDocument();
    Frame* frame = document ? document->frame() : nullptr;
    return Inspector::Protocol::CSS::CSSStyleSheetHeader::create()
        .setStyleSheetId(id())
        .setOrigin(m_origin)
        .setDisabled(styleSheet->disabled())
        .setSourceURL(finalURL())
        .setTitle(styleSheet->title())
        .setFrameId(m_pageAgent->frameId(frame))
        .release();
}

static bool hasDynamicSpecificity(const CSSSelector& simpleSelector)
{
    // It is possible that these can have a static specificity if each selector in the list has
    // equal specificity, but lets always report that they can be dynamic.
    for (const CSSSelector* selector = &simpleSelector; selector; selector = selector->tagHistory()) {
        if (selector->match() == CSSSelector::PseudoClass) {
            CSSSelector::PseudoClassType pseudoClassType = selector->pseudoClassType();
            if (pseudoClassType == CSSSelector::PseudoClassMatches)
                return true;
            if (pseudoClassType == CSSSelector::PseudoClassNthChild || pseudoClassType == CSSSelector::PseudoClassNthLastChild) {
                if (selector->selectorList())
                    return true;
                return false;
            }
        }
    }

    return false;
}

static Ref<Inspector::Protocol::CSS::CSSSelector> buildObjectForSelectorHelper(const String& selectorText, const CSSSelector& selector, Element* element)
{
    auto inspectorSelector = Inspector::Protocol::CSS::CSSSelector::create()
        .setText(selectorText)
        .release();

    if (element) {
        bool dynamic = hasDynamicSpecificity(selector);
        if (dynamic)
            inspectorSelector->setDynamic(true);

        SelectorChecker::CheckingContext context(SelectorChecker::Mode::CollectingRules);
        SelectorChecker selectorChecker(element->document());

        unsigned specificity;
        bool okay = selectorChecker.match(&selector, element, context, specificity);
        if (!okay)
            specificity = selector.staticSpecificity(okay);

        if (okay) {
            auto tuple = Inspector::Protocol::Array<int>::create();
            tuple->addItem(static_cast<int>((specificity & CSSSelector::idMask) >> 16));
            tuple->addItem(static_cast<int>((specificity & CSSSelector::classMask) >> 8));
            tuple->addItem(static_cast<int>(specificity & CSSSelector::elementMask));
            inspectorSelector->setSpecificity(WTF::move(tuple));
        }
    }

    return WTF::move(inspectorSelector);
}

static Ref<Inspector::Protocol::Array<Inspector::Protocol::CSS::CSSSelector>> selectorsFromSource(const CSSRuleSourceData* sourceData, const String& sheetText, const CSSSelectorList& selectorList, Element* element)
{
    DEPRECATED_DEFINE_STATIC_LOCAL(JSC::Yarr::RegularExpression, comment, ("/\\*[^]*?\\*/", TextCaseSensitive, JSC::Yarr::MultilineEnabled));

    auto result = Inspector::Protocol::Array<Inspector::Protocol::CSS::CSSSelector>::create();
    const SelectorRangeList& ranges = sourceData->selectorRanges;
    const CSSSelector* selector = selectorList.first();
    for (size_t i = 0, size = ranges.size(); i < size; ++i) {
        // If we don't have a selector, that means the SourceData for this CSSStyleSheet
        // no longer matches up with the actual rules in the CSSStyleSheet.
        ASSERT(selector);
        if (!selector)
            break;

        const SourceRange& range = ranges.at(i);
        String selectorText = sheetText.substring(range.start, range.length());

        // We don't want to see any comments in the selector components, only the meaningful parts.
        replace(selectorText, comment, String());
        result->addItem(buildObjectForSelectorHelper(selectorText.stripWhiteSpace(), *selector, element));

        selector = CSSSelectorList::next(selector);
    }
    return WTF::move(result);
}

Ref<Inspector::Protocol::CSS::CSSSelector> InspectorStyleSheet::buildObjectForSelector(const CSSSelector* selector, Element* element)
{
    return buildObjectForSelectorHelper(selector->selectorText(), *selector, element);
}

Ref<Inspector::Protocol::CSS::SelectorList> InspectorStyleSheet::buildObjectForSelectorList(CSSStyleRule* rule, Element* element)
{
    RefPtr<CSSRuleSourceData> sourceData;
    if (ensureParsedDataReady())
        sourceData = ruleSourceDataFor(&rule->style());
    RefPtr<Inspector::Protocol::Array<Inspector::Protocol::CSS::CSSSelector>> selectors;

    // This intentionally does not rely on the source data to avoid catching the trailing comments (before the declaration starting '{').
    String selectorText = rule->selectorText();

    if (sourceData)
        selectors = selectorsFromSource(sourceData.get(), m_parsedStyleSheet->text(), rule->styleRule().selectorList(), element);
    else {
        selectors = Inspector::Protocol::Array<Inspector::Protocol::CSS::CSSSelector>::create();
        const CSSSelectorList& selectorList = rule->styleRule().selectorList();
        for (const CSSSelector* selector = selectorList.first(); selector; selector = CSSSelectorList::next(selector))
            selectors->addItem(buildObjectForSelector(selector, element));
    }
    auto result = Inspector::Protocol::CSS::SelectorList::create()
        .setSelectors(selectors.release())
        .setText(selectorText)
        .release();
    if (sourceData)
        result->setRange(buildSourceRangeObject(sourceData->ruleHeaderRange, lineEndings().get()));
    return WTF::move(result);
}

RefPtr<Inspector::Protocol::CSS::CSSRule> InspectorStyleSheet::buildObjectForRule(CSSStyleRule* rule, Element* element)
{
    CSSStyleSheet* styleSheet = pageStyleSheet();
    if (!styleSheet)
        return nullptr;

    auto result = Inspector::Protocol::CSS::CSSRule::create()
        .setSelectorList(buildObjectForSelectorList(rule, element))
        .setSourceLine(rule->styleRule().sourceLine())
        .setOrigin(m_origin)
        .setStyle(buildObjectForStyle(&rule->style()))
        .release();

    // "sourceURL" is present only for regular rules, otherwise "origin" should be used in the frontend.
    if (m_origin == Inspector::Protocol::CSS::StyleSheetOrigin::Regular)
        result->setSourceURL(finalURL());

    if (canBind()) {
        InspectorCSSId id(ruleId(rule));
        if (!id.isEmpty())
            result->setRuleId(id.asProtocolValue<Inspector::Protocol::CSS::CSSRuleId>());
    }

    auto mediaArray = Array<Inspector::Protocol::CSS::CSSMedia>::create();

    fillMediaListChain(rule, mediaArray.get());
    if (mediaArray->length())
        result->setMedia(WTF::move(mediaArray));

    return WTF::move(result);
}

RefPtr<Inspector::Protocol::CSS::CSSStyle> InspectorStyleSheet::buildObjectForStyle(CSSStyleDeclaration* style)
{
    RefPtr<CSSRuleSourceData> sourceData;
    if (ensureParsedDataReady())
        sourceData = ruleSourceDataFor(style);

    InspectorCSSId id = ruleOrStyleId(style);
    if (id.isEmpty()) {
        return Inspector::Protocol::CSS::CSSStyle::create()
            .setCssProperties(Array<Inspector::Protocol::CSS::CSSProperty>::create())
            .setShorthandEntries(Array<Inspector::Protocol::CSS::ShorthandEntry>::create())
            .release();
    }
    RefPtr<InspectorStyle> inspectorStyle = inspectorStyleForId(id);
    RefPtr<Inspector::Protocol::CSS::CSSStyle> result = inspectorStyle->buildObjectForStyle();

    // Style text cannot be retrieved without stylesheet, so set cssText here.
    if (sourceData) {
        String sheetText;
        bool success = getText(&sheetText);
        if (success) {
            const SourceRange& bodyRange = sourceData->ruleBodyRange;
            result->setCssText(sheetText.substring(bodyRange.start, bodyRange.end - bodyRange.start));
        }
    }

    return WTF::move(result);
}

bool InspectorStyleSheet::setStyleText(const InspectorCSSId& id, const String& text, String* oldText, ExceptionCode& ec)
{
    RefPtr<InspectorStyle> inspectorStyle = inspectorStyleForId(id);
    if (!inspectorStyle) {
        ec = NOT_FOUND_ERR;
        return false;
    }

    if (oldText && !inspectorStyle->getText(oldText))
        return false;

    bool success = inspectorStyle->setText(text, ec);
    if (success)
        fireStyleSheetChanged();
    return success;
}

bool InspectorStyleSheet::getText(String* result) const
{
    if (!ensureText())
        return false;
    *result = m_parsedStyleSheet->text();
    return true;
}

CSSStyleDeclaration* InspectorStyleSheet::styleForId(const InspectorCSSId& id) const
{
    CSSStyleRule* rule = ruleForId(id);
    if (!rule)
        return nullptr;

    return &rule->style();
}

void InspectorStyleSheet::fireStyleSheetChanged()
{
    if (m_listener)
        m_listener->styleSheetChanged(this);
}

RefPtr<InspectorStyle> InspectorStyleSheet::inspectorStyleForId(const InspectorCSSId& id)
{
    CSSStyleDeclaration* style = styleForId(id);
    if (!style)
        return nullptr;

    return InspectorStyle::create(id, style, this);
}

InspectorCSSId InspectorStyleSheet::ruleOrStyleId(CSSStyleDeclaration* style) const
{
    unsigned index = ruleIndexByStyle(style);
    if (index != UINT_MAX)
        return InspectorCSSId(id(), index);
    return InspectorCSSId();
}

Document* InspectorStyleSheet::ownerDocument() const
{
    return m_pageStyleSheet->ownerDocument();
}

RefPtr<CSSRuleSourceData> InspectorStyleSheet::ruleSourceDataFor(CSSStyleDeclaration* style) const
{
    return m_parsedStyleSheet->ruleSourceDataAt(ruleIndexByStyle(style));
}

std::unique_ptr<Vector<size_t>> InspectorStyleSheet::lineEndings() const
{
    if (!m_parsedStyleSheet->hasText())
        return nullptr;
    return ContentSearchUtilities::lineEndings(m_parsedStyleSheet->text());
}

unsigned InspectorStyleSheet::ruleIndexByStyle(CSSStyleDeclaration* pageStyle) const
{
    ensureFlatRules();
    unsigned index = 0;
    for (unsigned i = 0, size = m_flatRules.size(); i < size; ++i) {
        if (&m_flatRules.at(i)->style() == pageStyle)
            return index;

        ++index;
    }
    return UINT_MAX;
}

bool InspectorStyleSheet::checkPageStyleSheet(ExceptionCode& ec) const
{
    if (!m_pageStyleSheet) {
        ec = NOT_SUPPORTED_ERR;
        return false;
    }
    return true;
}

bool InspectorStyleSheet::styleSheetMutated() const
{
    return m_pageStyleSheet && m_pageStyleSheet->hadRulesMutation();
}

bool InspectorStyleSheet::ensureParsedDataReady()
{
    bool allowParsedData = m_origin == Inspector::Protocol::CSS::StyleSheetOrigin::Inspector || !styleSheetMutated();
    return allowParsedData && ensureText() && ensureSourceData();
}

bool InspectorStyleSheet::ensureText() const
{
    if (!m_parsedStyleSheet)
        return false;
    if (m_parsedStyleSheet->hasText())
        return true;

    String text;
    bool success = originalStyleSheetText(&text);
    if (success)
        m_parsedStyleSheet->setText(text);
    // No need to clear m_flatRules here - it's empty.

    return success;
}

bool InspectorStyleSheet::ensureSourceData()
{
    if (m_parsedStyleSheet->hasSourceData())
        return true;

    if (!m_parsedStyleSheet->hasText())
        return false;

    RefPtr<StyleSheetContents> newStyleSheet = StyleSheetContents::create();
    auto ruleSourceDataResult = std::make_unique<RuleSourceDataList>();
    createCSSParser(m_pageStyleSheet->ownerDocument())->parseSheet(newStyleSheet.get(), m_parsedStyleSheet->text(), TextPosition(), ruleSourceDataResult.get(), false);
    m_parsedStyleSheet->setSourceData(WTF::move(ruleSourceDataResult));
    return m_parsedStyleSheet->hasSourceData();
}

void InspectorStyleSheet::ensureFlatRules() const
{
    // We are fine with redoing this for empty stylesheets as this will run fast.
    if (m_flatRules.isEmpty())
        collectFlatRules(asCSSRuleList(pageStyleSheet()), &m_flatRules);
}

bool InspectorStyleSheet::setStyleText(CSSStyleDeclaration* style, const String& text, ExceptionCode& ec)
{
    if (!m_pageStyleSheet)
        return false;
    if (!ensureParsedDataReady())
        return false;

    String patchedStyleSheetText;
    bool success = styleSheetTextWithChangedStyle(style, text, &patchedStyleSheetText);
    if (!success)
        return false;

    InspectorCSSId id = ruleOrStyleId(style);
    if (id.isEmpty())
        return false;

    style->setCssText(text, ec);
    if (!ec)
        m_parsedStyleSheet->setText(patchedStyleSheetText);

    return !ec;
}

bool InspectorStyleSheet::styleSheetTextWithChangedStyle(CSSStyleDeclaration* style, const String& newStyleText, String* result)
{
    if (!style)
        return false;

    if (!ensureParsedDataReady())
        return false;

    RefPtr<CSSRuleSourceData> sourceData = ruleSourceDataFor(style);
    unsigned bodyStart = sourceData->ruleBodyRange.start;
    unsigned bodyEnd = sourceData->ruleBodyRange.end;
    ASSERT(bodyStart <= bodyEnd);

    String text = m_parsedStyleSheet->text();
    ASSERT_WITH_SECURITY_IMPLICATION(bodyEnd <= text.length()); // bodyEnd is exclusive

    text.replace(bodyStart, bodyEnd - bodyStart, newStyleText);
    *result = text;
    return true;
}

InspectorCSSId InspectorStyleSheet::ruleId(CSSStyleRule* rule) const
{
    return ruleOrStyleId(&rule->style());
}

bool InspectorStyleSheet::originalStyleSheetText(String* result) const
{
    bool success = inlineStyleSheetText(result);
    if (!success)
        success = resourceStyleSheetText(result);
    return success;
}

bool InspectorStyleSheet::resourceStyleSheetText(String* result) const
{
    if (m_origin == Inspector::Protocol::CSS::StyleSheetOrigin::User || m_origin == Inspector::Protocol::CSS::StyleSheetOrigin::UserAgent)
        return false;

    if (!m_pageStyleSheet || !ownerDocument() || !ownerDocument()->frame())
        return false;

    String error;
    bool base64Encoded;
    InspectorPageAgent::resourceContent(error, ownerDocument()->frame(), URL(ParsedURLString, m_pageStyleSheet->href()), result, &base64Encoded);
    return error.isEmpty() && !base64Encoded;
}

bool InspectorStyleSheet::inlineStyleSheetText(String* result) const
{
    if (!m_pageStyleSheet)
        return false;

    Node* ownerNode = m_pageStyleSheet->ownerNode();
    if (!is<Element>(ownerNode))
        return false;
    Element& ownerElement = downcast<Element>(*ownerNode);

    if (!is<HTMLStyleElement>(ownerElement) && !is<SVGStyleElement>(ownerElement))
        return false;
    *result = ownerElement.textContent();
    return true;
}

Ref<Inspector::Protocol::Array<Inspector::Protocol::CSS::CSSRule>> InspectorStyleSheet::buildArrayForRuleList(CSSRuleList* ruleList)
{
    auto result = Inspector::Protocol::Array<Inspector::Protocol::CSS::CSSRule>::create();
    if (!ruleList)
        return WTF::move(result);

    RefPtr<CSSRuleList> refRuleList = ruleList;
    CSSStyleRuleVector rules;
    collectFlatRules(WTF::move(refRuleList), &rules);

    for (unsigned i = 0, size = rules.size(); i < size; ++i)
        result->addItem(buildObjectForRule(rules.at(i).get(), nullptr));

    return WTF::move(result);
}

void InspectorStyleSheet::collectFlatRules(RefPtr<CSSRuleList>&& ruleList, CSSStyleRuleVector* result)
{
    if (!ruleList)
        return;

    for (unsigned i = 0, size = ruleList->length(); i < size; ++i) {
        CSSRule* rule = ruleList->item(i);
        CSSStyleRule* styleRule = InspectorCSSAgent::asCSSStyleRule(*rule);
        if (styleRule)
            result->append(styleRule);
        else {
            RefPtr<CSSRuleList> childRuleList = asCSSRuleList(rule);
            if (childRuleList)
                collectFlatRules(WTF::move(childRuleList), result);
        }
    }
}

Ref<InspectorStyleSheetForInlineStyle> InspectorStyleSheetForInlineStyle::create(InspectorPageAgent* pageAgent, const String& id, RefPtr<Element>&& element, Inspector::Protocol::CSS::StyleSheetOrigin origin, Listener* listener)
{
    return adoptRef(*new InspectorStyleSheetForInlineStyle(pageAgent, id, WTF::move(element), origin, listener));
}

InspectorStyleSheetForInlineStyle::InspectorStyleSheetForInlineStyle(InspectorPageAgent* pageAgent, const String& id, RefPtr<Element>&& element, Inspector::Protocol::CSS::StyleSheetOrigin origin, Listener* listener)
    : InspectorStyleSheet(pageAgent, id, nullptr, origin, String(), listener)
    , m_element(WTF::move(element))
    , m_ruleSourceData(nullptr)
    , m_isStyleTextValid(false)
{
    ASSERT(m_element);
    m_inspectorStyle = InspectorStyle::create(InspectorCSSId(id, 0), inlineStyle(), this);
    m_styleText = m_element->isStyledElement() ? m_element->getAttribute("style").string() : String();
}

void InspectorStyleSheetForInlineStyle::didModifyElementAttribute()
{
    m_isStyleTextValid = false;
    if (m_element->isStyledElement() && m_element->style() != m_inspectorStyle->cssStyle())
        m_inspectorStyle = InspectorStyle::create(InspectorCSSId(id(), 0), inlineStyle(), this);
    m_ruleSourceData = nullptr;
}

bool InspectorStyleSheetForInlineStyle::getText(String* result) const
{
    if (!m_isStyleTextValid) {
        m_styleText = elementStyleText();
        m_isStyleTextValid = true;
    }
    *result = m_styleText;
    return true;
}

bool InspectorStyleSheetForInlineStyle::setStyleText(CSSStyleDeclaration* style, const String& text, ExceptionCode& ec)
{
    ASSERT_UNUSED(style, style == inlineStyle());

    {
        InspectorCSSAgent::InlineStyleOverrideScope overrideScope(&m_element->document());
        m_element->setAttribute("style", text, ec);
    }

    m_styleText = text;
    m_isStyleTextValid = true;
    m_ruleSourceData = nullptr;
    return !ec;
}

std::unique_ptr<Vector<size_t>> InspectorStyleSheetForInlineStyle::lineEndings() const
{
    return ContentSearchUtilities::lineEndings(elementStyleText());
}

Document* InspectorStyleSheetForInlineStyle::ownerDocument() const
{
    return &m_element->document();
}

bool InspectorStyleSheetForInlineStyle::ensureParsedDataReady()
{
    // The "style" property value can get changed indirectly, e.g. via element.style.borderWidth = "2px".
    const String& currentStyleText = elementStyleText();
    if (m_styleText != currentStyleText) {
        m_ruleSourceData = nullptr;
        m_styleText = currentStyleText;
        m_isStyleTextValid = true;
    }

    if (m_ruleSourceData)
        return true;

    m_ruleSourceData = CSSRuleSourceData::create(CSSRuleSourceData::STYLE_RULE);
    bool success = getStyleAttributeRanges(m_ruleSourceData.get());
    if (!success)
        return false;

    return true;
}

RefPtr<InspectorStyle> InspectorStyleSheetForInlineStyle::inspectorStyleForId(const InspectorCSSId& id)
{
    ASSERT_UNUSED(id, !id.ordinal());
    return m_inspectorStyle.copyRef();
}

CSSStyleDeclaration* InspectorStyleSheetForInlineStyle::inlineStyle() const
{
    return m_element->style();
}

const String& InspectorStyleSheetForInlineStyle::elementStyleText() const
{
    return m_element->getAttribute("style").string();
}

bool InspectorStyleSheetForInlineStyle::getStyleAttributeRanges(CSSRuleSourceData* result) const
{
    if (!m_element->isStyledElement())
        return false;

    if (m_styleText.isEmpty()) {
        result->ruleBodyRange.start = 0;
        result->ruleBodyRange.end = 0;
        return true;
    }

    RefPtr<MutableStyleProperties> tempDeclaration = MutableStyleProperties::create();
    createCSSParser(&m_element->document())->parseDeclaration(tempDeclaration.get(), m_styleText, result, &m_element->document().elementSheet().contents());
    return true;
}

} // namespace WebCore
