WebCore/html/HTMLLinkElement.cpp - platform/external/webkit - Git at Google

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Rob Buis (rwlbuis@gmail.com)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */

 #include "config.h"
 #include "HTMLLinkElement.h"

 #include "CSSHelper.h"
 #include "CachedCSSStyleSheet.h"
 #include "DNS.h"
 #include "DocLoader.h"
 #include "Document.h"
 #include "Frame.h"
 #include "FrameLoader.h"
 #include "FrameLoaderClient.h"
 #include "FrameTree.h"
 #include "HTMLNames.h"
 #include "MappedAttribute.h"
 #include "MediaList.h"
 #include "MediaQueryEvaluator.h"
 #include "Page.h"
 #include "ScriptEventListener.h"
 #include "Settings.h"

 namespace WebCore {

 using namespace HTMLNames;

 HTMLLinkElement::HTMLLinkElement(const QualifiedName& qName, Document *doc, bool createdByParser)
     : HTMLElement(qName, doc)
     , m_cachedSheet(0)
     , m_disabledState(0)
     , m_loading(false)
     , m_alternate(false)
     , m_isStyleSheet(false)
     , m_isIcon(false)
 #ifdef ANDROID_APPLE_TOUCH_ICON
     , m_isTouchIcon(false)
     , m_isPrecomposedTouchIcon(false)
 #endif
     , m_isDNSPrefetch(false)
     , m_createdByParser(createdByParser)
 {
     ASSERT(hasTagName(linkTag));
 }

 HTMLLinkElement::~HTMLLinkElement()
 {
     if (m_cachedSheet) {
         m_cachedSheet->removeClient(this);
         if (m_loading && !isDisabled() && !isAlternate())
             document()->removePendingSheet();
     }
 }

 void HTMLLinkElement::setDisabledState(bool _disabled)
 {
     int oldDisabledState = m_disabledState;
     m_disabledState = _disabled ? 2 : 1;
     if (oldDisabledState != m_disabledState) {
         // If we change the disabled state while the sheet is still loading, then we have to
         // perform three checks:
         if (isLoading()) {
             // Check #1: If the sheet becomes disabled while it was loading, and if it was either
             // a main sheet or a sheet that was previously enabled via script, then we need
             // to remove it from the list of pending sheets.
             if (m_disabledState == 2 && (!m_alternate || oldDisabledState == 1))
                 document()->removePendingSheet();

             // Check #2: An alternate sheet becomes enabled while it is still loading.
             if (m_alternate && m_disabledState == 1)
                 document()->addPendingSheet();

             // Check #3: A main sheet becomes enabled while it was still loading and
             // after it was disabled via script.  It takes really terrible code to make this
             // happen (a double toggle for no reason essentially).  This happens on
             // virtualplastic.net, which manages to do about 12 enable/disables on only 3
             // sheets. :)
             if (!m_alternate && m_disabledState == 1 && oldDisabledState == 2)
                 document()->addPendingSheet();

             // If the sheet is already loading just bail.
             return;
         }

         // Load the sheet, since it's never been loaded before.
         if (!m_sheet && m_disabledState == 1)
             process();
         else
             document()->updateStyleSelector(); // Update the style selector.
     }
 }

 StyleSheet* HTMLLinkElement::sheet() const
 {
     return m_sheet.get();
 }

 void HTMLLinkElement::parseMappedAttribute(MappedAttribute *attr)
 {
     if (attr->name() == relAttr) {
 #ifdef ANDROID_APPLE_TOUCH_ICON
         tokenizeRelAttribute(attr->value(), m_isStyleSheet, m_alternate, m_isIcon, m_isTouchIcon, m_isPrecomposedTouchIcon, m_isDNSPrefetch);
 #else
         tokenizeRelAttribute(attr->value(), m_isStyleSheet, m_alternate, m_isIcon, m_isDNSPrefetch);
 #endif
         process();
     } else if (attr->name() == hrefAttr) {
         m_url = document()->completeURL(deprecatedParseURL(attr->value()));
         process();
     } else if (attr->name() == typeAttr) {
         m_type = attr->value();
         process();
     } else if (attr->name() == mediaAttr) {
         m_media = attr->value().string().lower();
         process();
     } else if (attr->name() == disabledAttr) {
         setDisabledState(!attr->isNull());
     } else if (attr->name() == onbeforeloadAttr)
         setAttributeEventListener(eventNames().beforeloadEvent, createAttributeEventListener(this, attr));
     else {
         if (attr->name() == titleAttr && m_sheet)
             m_sheet->setTitle(attr->value());
         HTMLElement::parseMappedAttribute(attr);
     }
 }

 #ifdef ANDROID_APPLE_TOUCH_ICON
 void HTMLLinkElement::tokenizeRelAttribute(const AtomicString& rel, bool& styleSheet, bool& alternate, bool& icon, bool& touchIcon, bool& precomposedTouchIcon, bool& dnsPrefetch)
 #else
 void HTMLLinkElement::tokenizeRelAttribute(const AtomicString& rel, bool& styleSheet, bool& alternate, bool& icon, bool& dnsPrefetch)
 #endif
 {
     styleSheet = false;
     icon = false;
     alternate = false;
     dnsPrefetch = false;
 #ifdef ANDROID_APPLE_TOUCH_ICON
     touchIcon = false;
     precomposedTouchIcon = false;
 #endif
     if (equalIgnoringCase(rel, "stylesheet"))
         styleSheet = true;
     else if (equalIgnoringCase(rel, "icon") || equalIgnoringCase(rel, "shortcut icon"))
         icon = true;
 #ifdef ANDROID_APPLE_TOUCH_ICON
     else if (equalIgnoringCase(rel, "apple-touch-icon"))
         touchIcon = true;
     else if (equalIgnoringCase(rel, "apple-touch-icon-precomposed"))
         precomposedTouchIcon = true;
 #endif
     else if (equalIgnoringCase(rel, "dns-prefetch"))
         dnsPrefetch = true;
     else if (equalIgnoringCase(rel, "alternate stylesheet") || equalIgnoringCase(rel, "stylesheet alternate")) {
         styleSheet = true;
         alternate = true;
     } else {
         // Tokenize the rel attribute and set bits based on specific keywords that we find.
         String relString = rel.string();
         relString.replace('\n', ' ');
         Vector<String> list;
         relString.split(' ', list);
         Vector<String>::const_iterator end = list.end();
         for (Vector<String>::const_iterator it = list.begin(); it != end; ++it) {
             if (equalIgnoringCase(*it, "stylesheet"))
                 styleSheet = true;
             else if (equalIgnoringCase(*it, "alternate"))
                 alternate = true;
             else if (equalIgnoringCase(*it, "icon"))
                 icon = true;
         }
     }
 }

 void HTMLLinkElement::process()
 {
     if (!inDocument())
         return;

     String type = m_type.lower();

     // IE extension: location of small icon for locationbar / bookmarks
     // We'll record this URL per document, even if we later only use it in top level frames
     if (m_isIcon && m_url.isValid() && !m_url.isEmpty())
         document()->setIconURL(m_url.string(), type);

 #ifdef ANDROID_APPLE_TOUCH_ICON
     if ((m_isTouchIcon || m_isPrecomposedTouchIcon) && m_url.isValid()
             && !m_url.isEmpty())
         document()->frame()->loader()->client()
                 ->dispatchDidReceiveTouchIconURL(m_url.string(),
                         m_isPrecomposedTouchIcon);
 #endif

     if (m_isDNSPrefetch && m_url.isValid() && !m_url.isEmpty())
         prefetchDNS(m_url.host());

     bool acceptIfTypeContainsTextCSS = document()->page() && document()->page()->settings() && document()->page()->settings()->treatsAnyTextCSSLinkAsStylesheet();

     // Stylesheet
     // This was buggy and would incorrectly match <link rel="alternate">, which has a different specified meaning. -dwh
     if (m_disabledState != 2 && (m_isStyleSheet || acceptIfTypeContainsTextCSS && type.contains("text/css")) && document()->frame() && m_url.isValid()) {
         // also, don't load style sheets for standalone documents

         String charset = getAttribute(charsetAttr);
         if (charset.isEmpty() && document()->frame())
             charset = document()->frame()->loader()->encoding();

         if (m_cachedSheet) {
             if (m_loading)
                 document()->removePendingSheet();
             m_cachedSheet->removeClient(this);
             m_cachedSheet = 0;
         }

         if (!dispatchBeforeLoadEvent(m_url))
             return;

         m_loading = true;

         // Add ourselves as a pending sheet, but only if we aren't an alternate
         // stylesheet.  Alternate stylesheets don't hold up render tree construction.
         if (!isAlternate())
             document()->addPendingSheet();

         m_cachedSheet = document()->docLoader()->requestCSSStyleSheet(m_url, charset);

         if (m_cachedSheet)
             m_cachedSheet->addClient(this);
         else {
             // The request may have been denied if (for example) the stylesheet is local and the document is remote.
             m_loading = false;
             if (!isAlternate())
                 document()->removePendingSheet();
         }
     } else if (m_sheet) {
         // we no longer contain a stylesheet, e.g. perhaps rel or type was changed
         m_sheet = 0;
         document()->updateStyleSelector();
     }
 }

 void HTMLLinkElement::insertedIntoDocument()
 {
     HTMLElement::insertedIntoDocument();
     document()->addStyleSheetCandidateNode(this, m_createdByParser);
     process();
 }

 void HTMLLinkElement::removedFromDocument()
 {
     HTMLElement::removedFromDocument();

     document()->removeStyleSheetCandidateNode(this);

     // FIXME: It's terrible to do a synchronous update of the style selector just because a <style> or <link> element got removed.
     if (document()->renderer())
         document()->updateStyleSelector();
 }

 void HTMLLinkElement::finishParsingChildren()
 {
     m_createdByParser = false;
     HTMLElement::finishParsingChildren();
 }

 void HTMLLinkElement::setCSSStyleSheet(const String& url, const String& charset, const CachedCSSStyleSheet* sheet)
 {
     m_sheet = CSSStyleSheet::create(this, url, charset);

     bool strictParsing = !document()->inCompatMode();
     bool enforceMIMEType = strictParsing;

     // Check to see if we should enforce the MIME type of the CSS resource in strict mode.
     // Running in iWeb 2 is one example of where we don't want to - <rdar://problem/6099748>
     if (enforceMIMEType && document()->page() && !document()->page()->settings()->enforceCSSMIMETypeInStrictMode())
         enforceMIMEType = false;

     String sheetText = sheet->sheetText(enforceMIMEType);
     m_sheet->parseString(sheetText, strictParsing);

     if (strictParsing && document()->settings() && document()->settings()->needsSiteSpecificQuirks()) {
         // Work around <https://bugs.webkit.org/show_bug.cgi?id=28350>.
         DEFINE_STATIC_LOCAL(const String, slashKHTMLFixesDotCss, ("/KHTMLFixes.css"));
         DEFINE_STATIC_LOCAL(const String, mediaWikiKHTMLFixesStyleSheet, ("/* KHTML fix stylesheet */\n/* work around the horizontal scrollbars */\n#column-content { margin-left: 0; }\n\n"));
         // There are two variants of KHTMLFixes.css. One is equal to mediaWikiKHTMLFixesStyleSheet,
         // while the other lacks the second trailing newline.
         if (url.endsWith(slashKHTMLFixesDotCss) && !sheetText.isNull() && mediaWikiKHTMLFixesStyleSheet.startsWith(sheetText)
                 && sheetText.length() >= mediaWikiKHTMLFixesStyleSheet.length() - 1) {
             ASSERT(m_sheet->length() == 1);
             ExceptionCode ec;
             m_sheet->deleteRule(0, ec);
         }
     }

     m_sheet->setTitle(title());

     RefPtr<MediaList> media = MediaList::createAllowingDescriptionSyntax(m_media);
     m_sheet->setMedia(media.get());

     m_loading = false;
     m_sheet->checkLoaded();
 }

 bool HTMLLinkElement::isLoading() const
 {
     if (m_loading)
         return true;
     if (!m_sheet)
         return false;
     return static_cast<CSSStyleSheet *>(m_sheet.get())->isLoading();
 }

 bool HTMLLinkElement::sheetLoaded()
 {
     if (!isLoading() && !isDisabled() && !isAlternate()) {
         document()->removePendingSheet();
         return true;
     }
     return false;
 }

 bool HTMLLinkElement::isURLAttribute(Attribute *attr) const
 {
     return attr->name() == hrefAttr;
 }

 bool HTMLLinkElement::disabled() const
 {
     return !getAttribute(disabledAttr).isNull();
 }

 void HTMLLinkElement::setDisabled(bool disabled)
 {
     setAttribute(disabledAttr, disabled ? "" : 0);
 }

 String HTMLLinkElement::charset() const
 {
     return getAttribute(charsetAttr);
 }

 void HTMLLinkElement::setCharset(const String& value)
 {
     setAttribute(charsetAttr, value);
 }

 KURL HTMLLinkElement::href() const
 {
     return document()->completeURL(getAttribute(hrefAttr));
 }

 void HTMLLinkElement::setHref(const String& value)
 {
     setAttribute(hrefAttr, value);
 }

 String HTMLLinkElement::hreflang() const
 {
     return getAttribute(hreflangAttr);
 }

 void HTMLLinkElement::setHreflang(const String& value)
 {
     setAttribute(hreflangAttr, value);
 }

 String HTMLLinkElement::media() const
 {
     return getAttribute(mediaAttr);
 }

 void HTMLLinkElement::setMedia(const String& value)
 {
     setAttribute(mediaAttr, value);
 }

 String HTMLLinkElement::rel() const
 {
     return getAttribute(relAttr);
 }

 void HTMLLinkElement::setRel(const String& value)
 {
     setAttribute(relAttr, value);
 }

 String HTMLLinkElement::rev() const
 {
     return getAttribute(revAttr);
 }

 void HTMLLinkElement::setRev(const String& value)
 {
     setAttribute(revAttr, value);
 }

 String HTMLLinkElement::target() const
 {
     return getAttribute(targetAttr);
 }

 void HTMLLinkElement::setTarget(const String& value)
 {
     setAttribute(targetAttr, value);
 }

 String HTMLLinkElement::type() const
 {
     return getAttribute(typeAttr);
 }

 void HTMLLinkElement::setType(const String& value)
 {
     setAttribute(typeAttr, value);
 }

 void HTMLLinkElement::addSubresourceAttributeURLs(ListHashSet<KURL>& urls) const
 {
     HTMLElement::addSubresourceAttributeURLs(urls);

     // Favicons are handled by a special case in LegacyWebArchive::create()
     if (m_isIcon)
         return;

     if (!m_isStyleSheet)
         return;

     // Append the URL of this link element.
     addSubresourceURL(urls, href());

     // Walk the URLs linked by the linked-to stylesheet.
     if (StyleSheet* styleSheet = const_cast<HTMLLinkElement*>(this)->sheet())
         styleSheet->addSubresourceStyleURLs(urls);
 }

 #ifdef ANDROID_INSTRUMENT
 void* HTMLLinkElement::operator new(size_t size)
 {
     return Node::operator new(size);
 }

 void* HTMLLinkElement::operator new[](size_t size)
 {
     return Node::operator new[](size);
 }

 void HTMLLinkElement::operator delete(void* p, size_t size)
 {
     Node::operator delete(p, size);
 }

 void HTMLLinkElement::operator delete[](void* p, size_t size)
 {
     Node::operator delete[](p, size);
 }
 #endif

 }
	/*
	* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
	* (C) 1999 Antti Koivisto (koivisto@kde.org)
	* (C) 2001 Dirk Mueller (mueller@kde.org)
	* Copyright (C) 2003, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
	* Copyright (C) 2009 Rob Buis (rwlbuis@gmail.com)
	*
	* This library is free software; you can redistribute it and/or
	* modify it under the terms of the GNU Library General Public
	* License as published by the Free Software Foundation; either
	* version 2 of the License, or (at your option) any later version.
	*
	* This library is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* Library General Public License for more details.
	*
	* You should have received a copy of the GNU Library General Public License
	* along with this library; see the file COPYING.LIB. If not, write to
	* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
	* Boston, MA 02110-1301, USA.
	*/

	#include "config.h"
	#include "HTMLLinkElement.h"

	#include "CSSHelper.h"
	#include "CachedCSSStyleSheet.h"
	#include "DNS.h"
	#include "DocLoader.h"
	#include "Document.h"
	#include "Frame.h"
	#include "FrameLoader.h"
	#include "FrameLoaderClient.h"
	#include "FrameTree.h"
	#include "HTMLNames.h"
	#include "MappedAttribute.h"
	#include "MediaList.h"
	#include "MediaQueryEvaluator.h"
	#include "Page.h"
	#include "ScriptEventListener.h"
	#include "Settings.h"

	namespace WebCore {

	using namespace HTMLNames;

	HTMLLinkElement::HTMLLinkElement(const QualifiedName& qName, Document *doc, bool createdByParser)
	: HTMLElement(qName, doc)
	, m_cachedSheet(0)
	, m_disabledState(0)
	, m_loading(false)
	, m_alternate(false)
	, m_isStyleSheet(false)
	, m_isIcon(false)
	#ifdef ANDROID_APPLE_TOUCH_ICON
	, m_isTouchIcon(false)
	, m_isPrecomposedTouchIcon(false)
	#endif
	, m_isDNSPrefetch(false)
	, m_createdByParser(createdByParser)
	{
	ASSERT(hasTagName(linkTag));
	}

	HTMLLinkElement::~HTMLLinkElement()
	{
	if (m_cachedSheet) {
	m_cachedSheet->removeClient(this);
	if (m_loading && !isDisabled() && !isAlternate())
	document()->removePendingSheet();
	}
	}

	void HTMLLinkElement::setDisabledState(bool _disabled)
	{
	int oldDisabledState = m_disabledState;
	m_disabledState = _disabled ? 2 : 1;
	if (oldDisabledState != m_disabledState) {
	// If we change the disabled state while the sheet is still loading, then we have to
	// perform three checks:
	if (isLoading()) {
	// Check #1: If the sheet becomes disabled while it was loading, and if it was either
	// a main sheet or a sheet that was previously enabled via script, then we need
	// to remove it from the list of pending sheets.
	if (m_disabledState == 2 && (!m_alternate \|\| oldDisabledState == 1))
	document()->removePendingSheet();

	// Check #2: An alternate sheet becomes enabled while it is still loading.
	if (m_alternate && m_disabledState == 1)
	document()->addPendingSheet();

	// Check #3: A main sheet becomes enabled while it was still loading and
	// after it was disabled via script. It takes really terrible code to make this
	// happen (a double toggle for no reason essentially). This happens on
	// virtualplastic.net, which manages to do about 12 enable/disables on only 3
	// sheets. :)
	if (!m_alternate && m_disabledState == 1 && oldDisabledState == 2)
	document()->addPendingSheet();

	// If the sheet is already loading just bail.
	return;
	}

	// Load the sheet, since it's never been loaded before.
	if (!m_sheet && m_disabledState == 1)
	process();
	else
	document()->updateStyleSelector(); // Update the style selector.
	}
	}

	StyleSheet* HTMLLinkElement::sheet() const
	{
	return m_sheet.get();
	}

	void HTMLLinkElement::parseMappedAttribute(MappedAttribute *attr)
	{
	if (attr->name() == relAttr) {
	#ifdef ANDROID_APPLE_TOUCH_ICON
	tokenizeRelAttribute(attr->value(), m_isStyleSheet, m_alternate, m_isIcon, m_isTouchIcon, m_isPrecomposedTouchIcon, m_isDNSPrefetch);
	#else
	tokenizeRelAttribute(attr->value(), m_isStyleSheet, m_alternate, m_isIcon, m_isDNSPrefetch);
	#endif
	process();
	} else if (attr->name() == hrefAttr) {
	m_url = document()->completeURL(deprecatedParseURL(attr->value()));
	process();
	} else if (attr->name() == typeAttr) {
	m_type = attr->value();
	process();
	} else if (attr->name() == mediaAttr) {
	m_media = attr->value().string().lower();
	process();
	} else if (attr->name() == disabledAttr) {
	setDisabledState(!attr->isNull());
	} else if (attr->name() == onbeforeloadAttr)
	setAttributeEventListener(eventNames().beforeloadEvent, createAttributeEventListener(this, attr));
	else {
	if (attr->name() == titleAttr && m_sheet)
	m_sheet->setTitle(attr->value());
	HTMLElement::parseMappedAttribute(attr);
	}
	}

	#ifdef ANDROID_APPLE_TOUCH_ICON
	void HTMLLinkElement::tokenizeRelAttribute(const AtomicString& rel, bool& styleSheet, bool& alternate, bool& icon, bool& touchIcon, bool& precomposedTouchIcon, bool& dnsPrefetch)
	#else
	void HTMLLinkElement::tokenizeRelAttribute(const AtomicString& rel, bool& styleSheet, bool& alternate, bool& icon, bool& dnsPrefetch)
	#endif
	{
	styleSheet = false;
	icon = false;
	alternate = false;
	dnsPrefetch = false;
	#ifdef ANDROID_APPLE_TOUCH_ICON
	touchIcon = false;
	precomposedTouchIcon = false;
	#endif
	if (equalIgnoringCase(rel, "stylesheet"))
	styleSheet = true;
	else if (equalIgnoringCase(rel, "icon") \|\| equalIgnoringCase(rel, "shortcut icon"))
	icon = true;
	#ifdef ANDROID_APPLE_TOUCH_ICON
	else if (equalIgnoringCase(rel, "apple-touch-icon"))
	touchIcon = true;
	else if (equalIgnoringCase(rel, "apple-touch-icon-precomposed"))
	precomposedTouchIcon = true;
	#endif
	else if (equalIgnoringCase(rel, "dns-prefetch"))
	dnsPrefetch = true;
	else if (equalIgnoringCase(rel, "alternate stylesheet") \|\| equalIgnoringCase(rel, "stylesheet alternate")) {
	styleSheet = true;
	alternate = true;
	} else {
	// Tokenize the rel attribute and set bits based on specific keywords that we find.
	String relString = rel.string();
	relString.replace('\n', ' ');
	Vector<String> list;
	relString.split(' ', list);
	Vector<String>::const_iterator end = list.end();
	for (Vector<String>::const_iterator it = list.begin(); it != end; ++it) {
	if (equalIgnoringCase(*it, "stylesheet"))
	styleSheet = true;
	else if (equalIgnoringCase(*it, "alternate"))
	alternate = true;
	else if (equalIgnoringCase(*it, "icon"))
	icon = true;
	}
	}
	}

	void HTMLLinkElement::process()
	{
	if (!inDocument())
	return;

	String type = m_type.lower();

	// IE extension: location of small icon for locationbar / bookmarks
	// We'll record this URL per document, even if we later only use it in top level frames
	if (m_isIcon && m_url.isValid() && !m_url.isEmpty())
	document()->setIconURL(m_url.string(), type);

	#ifdef ANDROID_APPLE_TOUCH_ICON
	if ((m_isTouchIcon \|\| m_isPrecomposedTouchIcon) && m_url.isValid()
	&& !m_url.isEmpty())
	document()->frame()->loader()->client()
	->dispatchDidReceiveTouchIconURL(m_url.string(),
	m_isPrecomposedTouchIcon);
	#endif

	if (m_isDNSPrefetch && m_url.isValid() && !m_url.isEmpty())
	prefetchDNS(m_url.host());

	bool acceptIfTypeContainsTextCSS = document()->page() && document()->page()->settings() && document()->page()->settings()->treatsAnyTextCSSLinkAsStylesheet();

	// Stylesheet
	// This was buggy and would incorrectly match <link rel="alternate">, which has a different specified meaning. -dwh
	if (m_disabledState != 2 && (m_isStyleSheet \|\| acceptIfTypeContainsTextCSS && type.contains("text/css")) && document()->frame() && m_url.isValid()) {
	// also, don't load style sheets for standalone documents

	String charset = getAttribute(charsetAttr);
	if (charset.isEmpty() && document()->frame())
	charset = document()->frame()->loader()->encoding();

	if (m_cachedSheet) {
	if (m_loading)
	document()->removePendingSheet();
	m_cachedSheet->removeClient(this);
	m_cachedSheet = 0;
	}

	if (!dispatchBeforeLoadEvent(m_url))
	return;

	m_loading = true;

	// Add ourselves as a pending sheet, but only if we aren't an alternate
	// stylesheet. Alternate stylesheets don't hold up render tree construction.
	if (!isAlternate())
	document()->addPendingSheet();

	m_cachedSheet = document()->docLoader()->requestCSSStyleSheet(m_url, charset);

	if (m_cachedSheet)
	m_cachedSheet->addClient(this);
	else {
	// The request may have been denied if (for example) the stylesheet is local and the document is remote.
	m_loading = false;
	if (!isAlternate())
	document()->removePendingSheet();
	}
	} else if (m_sheet) {
	// we no longer contain a stylesheet, e.g. perhaps rel or type was changed
	m_sheet = 0;
	document()->updateStyleSelector();
	}
	}

	void HTMLLinkElement::insertedIntoDocument()
	{
	HTMLElement::insertedIntoDocument();
	document()->addStyleSheetCandidateNode(this, m_createdByParser);
	process();
	}

	void HTMLLinkElement::removedFromDocument()
	{
	HTMLElement::removedFromDocument();

	document()->removeStyleSheetCandidateNode(this);

	// FIXME: It's terrible to do a synchronous update of the style selector just because a <style> or <link> element got removed.
	if (document()->renderer())
	document()->updateStyleSelector();
	}

	void HTMLLinkElement::finishParsingChildren()
	{
	m_createdByParser = false;
	HTMLElement::finishParsingChildren();
	}

	void HTMLLinkElement::setCSSStyleSheet(const String& url, const String& charset, const CachedCSSStyleSheet* sheet)
	{
	m_sheet = CSSStyleSheet::create(this, url, charset);

	bool strictParsing = !document()->inCompatMode();
	bool enforceMIMEType = strictParsing;

	// Check to see if we should enforce the MIME type of the CSS resource in strict mode.
	// Running in iWeb 2 is one example of where we don't want to - <rdar://problem/6099748>
	if (enforceMIMEType && document()->page() && !document()->page()->settings()->enforceCSSMIMETypeInStrictMode())
	enforceMIMEType = false;

	String sheetText = sheet->sheetText(enforceMIMEType);
	m_sheet->parseString(sheetText, strictParsing);

	if (strictParsing && document()->settings() && document()->settings()->needsSiteSpecificQuirks()) {
	// Work around <https://bugs.webkit.org/show_bug.cgi?id=28350>.
	DEFINE_STATIC_LOCAL(const String, slashKHTMLFixesDotCss, ("/KHTMLFixes.css"));
	DEFINE_STATIC_LOCAL(const String, mediaWikiKHTMLFixesStyleSheet, ("/* KHTML fix stylesheet /\n/ work around the horizontal scrollbars */\n#column-content { margin-left: 0; }\n\n"));
	// There are two variants of KHTMLFixes.css. One is equal to mediaWikiKHTMLFixesStyleSheet,
	// while the other lacks the second trailing newline.
	if (url.endsWith(slashKHTMLFixesDotCss) && !sheetText.isNull() && mediaWikiKHTMLFixesStyleSheet.startsWith(sheetText)
	&& sheetText.length() >= mediaWikiKHTMLFixesStyleSheet.length() - 1) {
	ASSERT(m_sheet->length() == 1);
	ExceptionCode ec;
	m_sheet->deleteRule(0, ec);
	}
	}

	m_sheet->setTitle(title());

	RefPtr<MediaList> media = MediaList::createAllowingDescriptionSyntax(m_media);
	m_sheet->setMedia(media.get());

	m_loading = false;
	m_sheet->checkLoaded();
	}

	bool HTMLLinkElement::isLoading() const
	{
	if (m_loading)
	return true;
	if (!m_sheet)
	return false;
	return static_cast<CSSStyleSheet *>(m_sheet.get())->isLoading();
	}

	bool HTMLLinkElement::sheetLoaded()
	{
	if (!isLoading() && !isDisabled() && !isAlternate()) {
	document()->removePendingSheet();
	return true;
	}
	return false;
	}

	bool HTMLLinkElement::isURLAttribute(Attribute *attr) const
	{
	return attr->name() == hrefAttr;
	}

	bool HTMLLinkElement::disabled() const
	{
	return !getAttribute(disabledAttr).isNull();
	}

	void HTMLLinkElement::setDisabled(bool disabled)
	{
	setAttribute(disabledAttr, disabled ? "" : 0);
	}

	String HTMLLinkElement::charset() const
	{
	return getAttribute(charsetAttr);
	}

	void HTMLLinkElement::setCharset(const String& value)
	{
	setAttribute(charsetAttr, value);
	}

	KURL HTMLLinkElement::href() const
	{
	return document()->completeURL(getAttribute(hrefAttr));
	}

	void HTMLLinkElement::setHref(const String& value)
	{
	setAttribute(hrefAttr, value);
	}

	String HTMLLinkElement::hreflang() const
	{
	return getAttribute(hreflangAttr);
	}

	void HTMLLinkElement::setHreflang(const String& value)
	{
	setAttribute(hreflangAttr, value);
	}

	String HTMLLinkElement::media() const
	{
	return getAttribute(mediaAttr);
	}

	void HTMLLinkElement::setMedia(const String& value)
	{
	setAttribute(mediaAttr, value);
	}

	String HTMLLinkElement::rel() const
	{
	return getAttribute(relAttr);
	}

	void HTMLLinkElement::setRel(const String& value)
	{
	setAttribute(relAttr, value);
	}

	String HTMLLinkElement::rev() const
	{
	return getAttribute(revAttr);
	}

	void HTMLLinkElement::setRev(const String& value)
	{
	setAttribute(revAttr, value);
	}

	String HTMLLinkElement::target() const
	{
	return getAttribute(targetAttr);
	}

	void HTMLLinkElement::setTarget(const String& value)
	{
	setAttribute(targetAttr, value);
	}

	String HTMLLinkElement::type() const
	{
	return getAttribute(typeAttr);
	}

	void HTMLLinkElement::setType(const String& value)
	{
	setAttribute(typeAttr, value);
	}

	void HTMLLinkElement::addSubresourceAttributeURLs(ListHashSet<KURL>& urls) const
	{
	HTMLElement::addSubresourceAttributeURLs(urls);

	// Favicons are handled by a special case in LegacyWebArchive::create()
	if (m_isIcon)
	return;

	if (!m_isStyleSheet)
	return;

	// Append the URL of this link element.
	addSubresourceURL(urls, href());

	// Walk the URLs linked by the linked-to stylesheet.
	if (StyleSheet* styleSheet = const_cast<HTMLLinkElement*>(this)->sheet())
	styleSheet->addSubresourceStyleURLs(urls);
	}

	#ifdef ANDROID_INSTRUMENT
	void* HTMLLinkElement::operator new(size_t size)
	{
	return Node::operator new(size);
	}

	void* HTMLLinkElement::operator new[](size_t size)
	{
	return Node::operator new[](size);
	}

	void HTMLLinkElement::operator delete(void* p, size_t size)
	{
	Node::operator delete(p, size);
	}

	void HTMLLinkElement::operator delete[](void* p, size_t size)
	{
	Node::operator delete[](p, size);
	}
	#endif

	}