void ProcessingInstruction::setCSSStyleSheet(
const String& href,
const KURL& baseURL,
const String& charset,
const CSSStyleSheetResource* sheet) {
if (!isConnected()) {
DCHECK(!m_sheet);
return;
}
DCHECK(m_isCSS);
CSSParserContext parserContext(document(), nullptr, baseURL, charset);
StyleSheetContents* newSheet =
StyleSheetContents::create(href, parserContext);
CSSStyleSheet* cssSheet = CSSStyleSheet::create(newSheet, *this);
cssSheet->setDisabled(m_alternate);
cssSheet->setTitle(m_title);
if (!m_alternate && !m_title.isEmpty())
document().styleEngine().setPreferredStylesheetSetNameIfNotSet(
m_title, StyleEngine::DontUpdateActiveSheets);
cssSheet->setMediaQueries(MediaQuerySet::create(m_media));
m_sheet = cssSheet;
// We don't need the cross-origin security check here because we are
// getting the sheet text in "strict" mode. This enforces a valid CSS MIME
// type.
parseStyleSheet(sheet->sheetText());
}
StyleElement::ProcessingResult StyleElement::createSheet(Element& element,
const String& text) {
DCHECK(element.isConnected());
Document& document = element.document();
const ContentSecurityPolicy* csp = document.contentSecurityPolicy();
bool passesContentSecurityPolicyChecks =
shouldBypassMainWorldCSP(element) ||
csp->allowStyleWithHash(text, ContentSecurityPolicy::InlineType::Block) ||
csp->allowInlineStyle(&element, document.url(),
element.fastGetAttribute(HTMLNames::nonceAttr),
m_startPosition.m_line, text);
// Clearing the current sheet may remove the cache entry so create the new
// sheet first
CSSStyleSheet* newSheet = nullptr;
// If type is empty or CSS, this is a CSS style sheet.
const AtomicString& type = this->type();
if (isCSS(element, type) && passesContentSecurityPolicyChecks) {
MediaQuerySet* mediaQueries = MediaQuerySet::create(media());
MediaQueryEvaluator screenEval("screen");
MediaQueryEvaluator printEval("print");
if (screenEval.eval(mediaQueries) || printEval.eval(mediaQueries)) {
m_loading = true;
TextPosition startPosition =
m_startPosition == TextPosition::belowRangePosition()
? TextPosition::minimumPosition()
: m_startPosition;
newSheet = document.styleEngine().createSheet(
element, text, startPosition, m_styleEngineContext);
newSheet->setMediaQueries(mediaQueries);
m_loading = false;
}
}
if (m_sheet)
clearSheet(element);
m_sheet = newSheet;
if (m_sheet)
m_sheet->contents()->checkLoaded();
return passesContentSecurityPolicyChecks ? ProcessingSuccessful
: ProcessingFatalError;
}