third_party/WebKit/Source/core/css/StyleRuleImport.cpp

   1 /*
   2  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
   3  * (C) 2002-2003 Dirk Mueller (mueller@kde.org)
   4  * Copyright (C) 2002, 2005, 2006, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Library General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Library General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Library General Public License
  17  * along with this library; see the file COPYING.LIB.  If not, write to
  18  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  19  * Boston, MA 02110-1301, USA.
  20  */
  21
  22 #include "config.h"
  23 #include "core/css/StyleRuleImport.h"
  24
  25 #include "core/css/StyleSheetContents.h"
  26 #include "core/dom/Document.h"
  27 #include "core/fetch/CSSStyleSheetResource.h"
  28 #include "core/fetch/FetchInitiatorTypeNames.h"
  29 #include "core/fetch/FetchRequest.h"
  30 #include "core/fetch/ResourceFetcher.h"
  31
  32 namespace blink {
  33
  34 PassRefPtrWillBeRawPtr<StyleRuleImport> StyleRuleImport::create(const String& href, PassRefPtrWillBeRawPtr<MediaQuerySet> media)
  35 {
  36     return adoptRefWillBeNoop(new StyleRuleImport(href, media));
  37 }
  38
  39 StyleRuleImport::StyleRuleImport(const String& href, PassRefPtrWillBeRawPtr<MediaQuerySet> media)
  40     : StyleRuleBase(Import)
  41     , m_parentStyleSheet(nullptr)
  42     , m_styleSheetClient(this)
  43     , m_strHref(href)
  44     , m_mediaQueries(media)
  45     , m_resource(nullptr)
  46     , m_loading(false)
  47 {
  48     if (!m_mediaQueries)
  49         m_mediaQueries = MediaQuerySet::create(String());
  50 }
  51
  52 StyleRuleImport::~StyleRuleImport()
  53 {
  54 #if !ENABLE(OILPAN)
  55     if (m_styleSheet)
  56         m_styleSheet->clearOwnerRule();
  57 #endif
  58     if (m_resource)
  59         m_resource->removeClient(&m_styleSheetClient);
  60 }
  61
  62 DEFINE_TRACE_AFTER_DISPATCH(StyleRuleImport)
  63 {
  64     visitor->trace(m_parentStyleSheet);
  65     visitor->trace(m_mediaQueries);
  66     visitor->trace(m_styleSheet);
  67     StyleRuleBase::traceAfterDispatch(visitor);
  68 }
  69
  70 void StyleRuleImport::setCSSStyleSheet(const String& href, const KURL& baseURL, const String& charset, const CSSStyleSheetResource* cachedStyleSheet)
  71 {
  72     if (m_styleSheet)
  73         m_styleSheet->clearOwnerRule();
  74
  75     CSSParserContext context = m_parentStyleSheet ? m_parentStyleSheet->parserContext() : strictCSSParserContext();
  76     context.setCharset(charset);
  77     Document* document = m_parentStyleSheet ? m_parentStyleSheet->singleOwnerDocument() : nullptr;
  78     if (!baseURL.isNull()) {
  79         context.setBaseURL(baseURL);
  80         if (document)
  81             context.setReferrer(Referrer(baseURL.strippedForUseAsReferrer(), document->referrerPolicy()));
  82     }
  83
  84     m_styleSheet = StyleSheetContents::create(this, href, context);
  85
  86     m_styleSheet->parseAuthorStyleSheet(cachedStyleSheet, document ? document->securityOrigin() : 0);
  87
  88     m_loading = false;
  89
  90     if (m_parentStyleSheet) {
  91         m_parentStyleSheet->notifyLoadedSheet(cachedStyleSheet);
  92         m_parentStyleSheet->checkLoaded();
  93     }
  94 }
  95
  96 bool StyleRuleImport::isLoading() const
  97 {
  98     return m_loading || (m_styleSheet && m_styleSheet->isLoading());
  99 }
 100
 101 void StyleRuleImport::requestStyleSheet()
 102 {
 103     if (!m_parentStyleSheet)
 104         return;
 105     Document* document = m_parentStyleSheet->singleOwnerDocument();
 106     if (!document)
 107         return;
 108
 109     ResourceFetcher* fetcher = document->fetcher();
 110     if (!fetcher)
 111         return;
 112
 113     KURL absURL;
 114     if (!m_parentStyleSheet->baseURL().isNull()) {
 115         // use parent styleheet's URL as the base URL
 116         absURL = KURL(m_parentStyleSheet->baseURL(), m_strHref);
 117     } else {
 118         absURL = document->completeURL(m_strHref);
 119     }
 120
 121     // Check for a cycle in our import chain.  If we encounter a stylesheet
 122     // in our parent chain with the same URL, then just bail.
 123     StyleSheetContents* rootSheet = m_parentStyleSheet;
 124     for (StyleSheetContents* sheet = m_parentStyleSheet; sheet; sheet = sheet->parentStyleSheet()) {
 125         if (equalIgnoringFragmentIdentifier(absURL, sheet->baseURL())
 126             || equalIgnoringFragmentIdentifier(absURL, document->completeURL(sheet->originalURL())))
 127             return;
 128         rootSheet = sheet;
 129     }
 130
 131     FetchRequest request(ResourceRequest(absURL), FetchInitiatorTypeNames::css, m_parentStyleSheet->charset());
 132     m_resource = CSSStyleSheetResource::fetch(request, fetcher);
 133     if (m_resource) {
 134         // if the import rule is issued dynamically, the sheet may be
 135         // removed from the pending sheet count, so let the doc know
 136         // the sheet being imported is pending.
 137         if (m_parentStyleSheet && m_parentStyleSheet->loadCompleted() && rootSheet == m_parentStyleSheet)
 138             m_parentStyleSheet->startLoadingDynamicSheet();
 139         m_loading = true;
 140         m_resource->addClient(&m_styleSheetClient);
 141     }
 142 }
 143
 144 } // namespace blink