void CSSStyleSheet::addSubresourceURLStrings(HashSet<String>& urls, const String& base) const { RefPtr<CSSRuleList> ruleList = const_cast<CSSStyleSheet*>(this)->cssRules(); // Add the URLs for each child import rule, and recurse for the stylesheet belonging to each of those rules. for (unsigned i = 0; i < ruleList->length(); ++i) { CSSRule* rule = ruleList->item(i); if (rule->type() != CSSRule::IMPORT_RULE) continue; CSSImportRule* importRule = static_cast<CSSImportRule*>(rule); CSSStyleSheet* ruleSheet = importRule->styleSheet(); if (!ruleSheet) continue; KURL fullURL(KURL(base), importRule->href()); urls.add(fullURL.string()); ruleSheet->addSubresourceURLStrings(urls, fullURL.string()); } }