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LibWeb: Spec-comment consume_a_list_of_rules()

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Sam Atkins 2022-03-30 13:03:00 +01:00 • committed by Andreas Kling
parent a4f8056828
commit d77de5ccec
1 changed files with 34 additions and 12 deletions
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46
Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
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@ -1516,50 +1516,72 @@ Optional<GeneralEnclosed> Parser::parse_general_enclosed(TokenStream<StyleCompon
return {};
}
// 5.4.1. Consume a list of rules
// https://www.w3.org/TR/css-syntax-3/#consume-list-of-rules
template<typename T>
NonnullRefPtrVector<StyleRule> Parser::consume_a_list_of_rules(TokenStream<T>& tokens, TopLevel top_level)
{
// To consume a list of rules, given a top-level flag:
// Create an initially empty list of rules.
NonnullRefPtrVector<StyleRule> rules;
// Repeatedly consume the next input token:
for (;;) {
auto& token = tokens.next_token();
// <whitespace-token>
if (token.is(Token::Type::Whitespace)) {
// Do nothing.
continue;
}
// <EOF-token>
if (token.is(Token::Type::EndOfFile)) {
break;
// Return the list of rules.
return rules;
}
// <CDO-token>
// <CDC-token>
if (token.is(Token::Type::CDO) || token.is(Token::Type::CDC)) {
if (top_level == TopLevel::Yes) {
// If the top-level flag is set, do nothing.
if (top_level == TopLevel::Yes)
continue;
}
// Otherwise, reconsume the current input token.
tokens.reconsume_current_input_token();
auto maybe_qualified = consume_a_qualified_rule(tokens);
if (maybe_qualified) {
// Consume a qualified rule. If anything is returned, append it to the list of rules.
if (auto maybe_qualified = consume_a_qualified_rule(tokens))
rules.append(maybe_qualified.release_nonnull());
}
continue;
}
// <at-keyword-token>
if (token.is(Token::Type::AtKeyword)) {
// Reconsume the current input token.
tokens.reconsume_current_input_token();
// Consume an at-rule, and append the returned value to the list of rules.
rules.append(consume_an_at_rule(tokens));
continue;
}
tokens.reconsume_current_input_token();
auto maybe_qualified = consume_a_qualified_rule(tokens);
if (maybe_qualified) {
rules.append(maybe_qualified.release_nonnull());
// anything else
{
// Reconsume the current input token.
tokens.reconsume_current_input_token();
// Consume a qualified rule. If anything is returned, append it to the list of rules.
if (auto maybe_qualified = consume_a_qualified_rule(tokens))
rules.append(maybe_qualified.release_nonnull());
continue;
}
}
return rules;
}
template<typename T>