254 lines
8.2 KiB
C++
254 lines
8.2 KiB
C++
/*
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* Copyright (C) 2006, 2007 Rob Buis
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* Copyright (C) 2008-2016 Apple, Inc. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#include "config.h"
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#include "InlineStyleSheetOwner.h"
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#include "ContentSecurityPolicy.h"
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#include "Element.h"
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#include "Logging.h"
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#include "MediaList.h"
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#include "MediaQueryEvaluator.h"
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#include "MediaQueryParser.h"
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#include "ScriptableDocumentParser.h"
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#include "ShadowRoot.h"
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#include "StyleScope.h"
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#include "StyleSheetContents.h"
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#include "TextNodeTraversal.h"
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#include <wtf/HashMap.h>
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#include <wtf/NeverDestroyed.h>
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namespace WebCore {
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using InlineStyleSheetCacheKey = std::pair<String, CSSParserContext>;
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using InlineStyleSheetCache = HashMap<InlineStyleSheetCacheKey, RefPtr<StyleSheetContents>>;
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static InlineStyleSheetCache& inlineStyleSheetCache()
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{
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static NeverDestroyed<InlineStyleSheetCache> cache;
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return cache;
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}
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static CSSParserContext parserContextForElement(const Element& element)
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{
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auto* shadowRoot = element.containingShadowRoot();
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// User agent shadow trees can't contain document-relative URLs. Use blank URL as base allowing cross-document sharing.
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auto& baseURL = shadowRoot && shadowRoot->mode() == ShadowRootMode::UserAgent ? aboutBlankURL() : element.document().baseURL();
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CSSParserContext result = CSSParserContext { element.document(), baseURL, element.document().characterSetWithUTF8Fallback() };
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if (shadowRoot && shadowRoot->mode() == ShadowRootMode::UserAgent)
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result.mode = UASheetMode;
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return result;
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}
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static std::optional<InlineStyleSheetCacheKey> makeInlineStyleSheetCacheKey(const String& text, const Element& element)
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{
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// Only cache for shadow trees. Main document inline stylesheets are generally unique and can't be shared between documents.
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// FIXME: This could be relaxed when a stylesheet does not contain document-relative URLs (or #urls).
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if (!element.isInShadowTree())
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return { };
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return std::make_pair(text, parserContextForElement(element));
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}
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InlineStyleSheetOwner::InlineStyleSheetOwner(Document& document, bool createdByParser)
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: m_isParsingChildren(createdByParser)
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, m_loading(false)
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, m_startTextPosition()
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{
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if (createdByParser && document.scriptableDocumentParser() && !document.isInDocumentWrite())
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m_startTextPosition = document.scriptableDocumentParser()->textPosition();
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}
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InlineStyleSheetOwner::~InlineStyleSheetOwner()
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{
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if (m_sheet)
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clearSheet();
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}
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void InlineStyleSheetOwner::insertedIntoDocument(Element& element)
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{
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m_styleScope = &Style::Scope::forNode(element);
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m_styleScope->addStyleSheetCandidateNode(element, m_isParsingChildren);
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if (m_isParsingChildren)
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return;
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createSheetFromTextContents(element);
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}
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void InlineStyleSheetOwner::removedFromDocument(Element& element)
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{
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if (m_styleScope) {
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m_styleScope->removeStyleSheetCandidateNode(element);
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m_styleScope = nullptr;
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}
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if (m_sheet)
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clearSheet();
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}
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void InlineStyleSheetOwner::clearDocumentData(Element& element)
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{
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if (m_sheet)
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m_sheet->clearOwnerNode();
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if (m_styleScope) {
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m_styleScope->removeStyleSheetCandidateNode(element);
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m_styleScope = nullptr;
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}
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}
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void InlineStyleSheetOwner::childrenChanged(Element& element)
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{
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if (m_isParsingChildren)
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return;
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if (!element.isConnected())
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return;
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createSheetFromTextContents(element);
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}
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void InlineStyleSheetOwner::finishParsingChildren(Element& element)
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{
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if (element.isConnected())
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createSheetFromTextContents(element);
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m_isParsingChildren = false;
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}
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void InlineStyleSheetOwner::createSheetFromTextContents(Element& element)
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{
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createSheet(element, TextNodeTraversal::contentsAsString(element));
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}
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void InlineStyleSheetOwner::clearSheet()
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{
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ASSERT(m_sheet);
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auto sheet = WTFMove(m_sheet);
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sheet->clearOwnerNode();
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}
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inline bool isValidCSSContentType(Element& element, const AtomString& type)
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{
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if (type.isEmpty())
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return true;
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// FIXME: Should MIME types really be case sensitive in XML documents? Doesn't seem like they should,
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// even though other things are case sensitive in that context. MIME types should never be case sensitive.
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// We should verify this and then remove the isHTMLElement check here.
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static MainThreadNeverDestroyed<const AtomString> cssContentType("text/css", AtomString::ConstructFromLiteral);
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return element.isHTMLElement() ? equalLettersIgnoringASCIICase(type, "text/css") : type == cssContentType;
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}
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void InlineStyleSheetOwner::createSheet(Element& element, const String& text)
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{
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ASSERT(element.isConnected());
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Document& document = element.document();
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if (m_sheet) {
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if (m_sheet->isLoading() && m_styleScope)
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m_styleScope->removePendingSheet(element);
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clearSheet();
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}
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if (!isValidCSSContentType(element, m_contentType))
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return;
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ASSERT(document.contentSecurityPolicy());
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const ContentSecurityPolicy& contentSecurityPolicy = *document.contentSecurityPolicy();
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bool hasKnownNonce = contentSecurityPolicy.allowStyleWithNonce(element.attributeWithoutSynchronization(HTMLNames::nonceAttr), element.isInUserAgentShadowTree());
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if (!contentSecurityPolicy.allowInlineStyle(document.url().string(), m_startTextPosition.m_line, text, hasKnownNonce))
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return;
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auto mediaQueries = MediaQuerySet::create(m_media, MediaQueryParserContext(document));
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if (m_styleScope)
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m_styleScope->addPendingSheet(element);
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auto cacheKey = makeInlineStyleSheetCacheKey(text, element);
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if (cacheKey) {
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if (auto* cachedSheet = inlineStyleSheetCache().get(*cacheKey)) {
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ASSERT(cachedSheet->isCacheable());
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m_sheet = CSSStyleSheet::createInline(*cachedSheet, element, m_startTextPosition);
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m_sheet->setMediaQueries(WTFMove(mediaQueries));
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if (!element.isInShadowTree())
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m_sheet->setTitle(element.title());
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sheetLoaded(element);
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element.notifyLoadedSheetAndAllCriticalSubresources(false);
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return;
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}
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}
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m_loading = true;
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auto contents = StyleSheetContents::create(String(), parserContextForElement(element));
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m_sheet = CSSStyleSheet::createInline(contents.get(), element, m_startTextPosition);
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m_sheet->setMediaQueries(WTFMove(mediaQueries));
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if (!element.isInShadowTree())
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m_sheet->setTitle(element.title());
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contents->parseString(text);
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m_loading = false;
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contents->checkLoaded();
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if (cacheKey && contents->isCacheable()) {
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m_sheet->contents().addedToMemoryCache();
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inlineStyleSheetCache().add(*cacheKey, &m_sheet->contents());
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// Prevent pathological growth.
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const size_t maximumInlineStyleSheetCacheSize = 50;
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if (inlineStyleSheetCache().size() > maximumInlineStyleSheetCacheSize) {
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auto toRemove = inlineStyleSheetCache().random();
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toRemove->value->removedFromMemoryCache();
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inlineStyleSheetCache().remove(toRemove);
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}
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}
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}
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bool InlineStyleSheetOwner::isLoading() const
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{
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if (m_loading)
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return true;
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return m_sheet && m_sheet->isLoading();
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}
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bool InlineStyleSheetOwner::sheetLoaded(Element& element)
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{
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if (isLoading())
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return false;
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if (m_styleScope)
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m_styleScope->removePendingSheet(element);
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return true;
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}
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void InlineStyleSheetOwner::startLoadingDynamicSheet(Element& element)
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{
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if (m_styleScope)
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m_styleScope->addPendingSheet(element);
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}
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void InlineStyleSheetOwner::clearCache()
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{
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inlineStyleSheetCache().clear();
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}
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}
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