void DocumentStyleSheetCollection::collectActiveStyleSheets(Vector<RefPtr<StyleSheet> >& sheets)
{
if (m_document->settings() && !m_document->settings()->authorAndUserStylesEnabled())
return;
StyleSheetCandidateListHashSet::iterator begin = m_styleSheetCandidateNodes.begin();
StyleSheetCandidateListHashSet::iterator end = m_styleSheetCandidateNodes.end();
for (StyleSheetCandidateListHashSet::iterator it = begin; it != end; ++it) {
Node* n = *it;
StyleSheet* sheet = 0;
if (n->nodeType() == Node::PROCESSING_INSTRUCTION_NODE) {
// Processing instruction (XML documents only).
// We don't support linking to embedded CSS stylesheets, see <https://bugs.webkit.org/show_bug.cgi?id=49281> for discussion.
ProcessingInstruction* pi = static_cast<ProcessingInstruction*>(n);
sheet = pi->sheet();
#if ENABLE(XSLT)
// Don't apply XSL transforms to already transformed documents -- <rdar://problem/4132806>
if (pi->isXSL() && !m_document->transformSourceDocument()) {
// Don't apply XSL transforms until loading is finished.
if (!m_document->parsing())
m_document->applyXSLTransform(pi);
return;
}
#endif
} else if ((n->isHTMLElement() && (n->hasTagName(linkTag) || n->hasTagName(styleTag)))
#if ENABLE(SVG)
|| (n->isSVGElement() && n->hasTagName(SVGNames::styleTag))
#endif
) {
Element* e = toElement(n);
AtomicString title = e->getAttribute(titleAttr);
bool enabledViaScript = false;
if (e->hasTagName(linkTag)) {
// <LINK> element
HTMLLinkElement* linkElement = static_cast<HTMLLinkElement*>(n);
if (linkElement->isDisabled())
continue;
enabledViaScript = linkElement->isEnabledViaScript();
if (linkElement->styleSheetIsLoading()) {
// it is loading but we should still decide which style sheet set to use
if (!enabledViaScript && !title.isEmpty() && m_preferredStylesheetSetName.isEmpty()) {
const AtomicString& rel = e->getAttribute(relAttr);
if (!rel.contains("alternate")) {
m_preferredStylesheetSetName = title;
m_selectedStylesheetSetName = title;
}
}
continue;
}
if (!linkElement->sheet())
title = nullAtom;
}
// Get the current preferred styleset. This is the
// set of sheets that will be enabled.
#if ENABLE(SVG)
if (e->hasTagName(SVGNames::styleTag))
sheet = static_cast<SVGStyleElement*>(n)->sheet();
else
#endif
{
if (e->hasTagName(linkTag))
sheet = static_cast<HTMLLinkElement*>(n)->sheet();
else
// <STYLE> element
sheet = toHTMLStyleElement(e)->sheet();
}
// Check to see if this sheet belongs to a styleset
// (thus making it PREFERRED or ALTERNATE rather than
// PERSISTENT).
AtomicString rel = e->getAttribute(relAttr);
if (!enabledViaScript && !title.isEmpty()) {
// Yes, we have a title.
if (m_preferredStylesheetSetName.isEmpty()) {
// No preferred set has been established. If
// we are NOT an alternate sheet, then establish
// us as the preferred set. Otherwise, just ignore
// this sheet.
if (e->hasTagName(styleTag) || !rel.contains("alternate"))
m_preferredStylesheetSetName = m_selectedStylesheetSetName = title;
}
if (title != m_preferredStylesheetSetName)
sheet = 0;
}
if (rel.contains("alternate") && title.isEmpty())
sheet = 0;
}
if (sheet)
sheets.append(sheet);
}
}
