unsigned CSSStyleSheet::insertRule(const String& rule, unsigned index, ExceptionCode& ec)
{
ec = 0;
if (index > length()) {
ec = INDEX_SIZE_ERR;
return 0;
}
CSSParser p(useStrictParsing());
RefPtr<CSSRule> r = p.parseRule(this, rule);
if (!r) {
ec = SYNTAX_ERR;
return 0;
}
// Throw a HIERARCHY_REQUEST_ERR exception if the rule cannot be inserted at the specified index. The best
// example of this is an @import rule inserted after regular rules.
if (index > 0) {
if (r->isImportRule()) {
// Check all the rules that come before this one to make sure they are only @charset and @import rules.
for (unsigned i = 0; i < index; ++i) {
if (!item(i)->isCharsetRule() && !item(i)->isImportRule()) {
ec = HIERARCHY_REQUEST_ERR;
return 0;
}
}
} else if (r->isCharsetRule()) {
// The @charset rule has to come first and there can be only one.
ec = HIERARCHY_REQUEST_ERR;
return 0;
}
}
CSSRule* c = r.get();
m_children.insert(index, r.release());
c->insertedIntoParent();
styleSheetChanged();
return index;
}
void CSSStyleSheet::append(PassRefPtr<CSSRule> child)
{
CSSRule* c = child.get();
m_children.append(child);
c->insertedIntoParent();
}