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LibWeb: Spec-comment consume_a_qualified_rule()

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Sam Atkins 2022-03-30 13:50:44 +01:00 • committed by Andreas Kling
parent fe86718035
commit e72f42bea1
1 changed files with 20 additions and 3 deletions
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23
Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
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@ -1643,35 +1643,52 @@ NonnullRefPtr<StyleRule> Parser::consume_an_at_rule(TokenStream<T>& tokens)
}
}
// 5.4.3. Consume a qualified rule
// https://www.w3.org/TR/css-syntax-3/#consume-qualified-rule
template<typename T>
RefPtr<StyleRule> Parser::consume_a_qualified_rule(TokenStream<T>& tokens)
{
// To consume a qualified rule:
// Create a new qualified rule with its prelude initially set to an empty list, and its value initially set to nothing.
auto rule = make_ref_counted<StyleRule>(StyleRule::Type::Qualified);
// Repeatedly consume the next input token:
for (;;) {
auto& token = tokens.next_token();
// <EOF-token>
if (token.is(Token::Type::EndOfFile)) {
// This is a parse error. Return nothing.
log_parse_error();
return {};
}
// <{-token>
if (token.is(Token::Type::OpenCurly)) {
// Consume a simple block and assign it to the qualified rule’s block. Return the qualified rule.
rule->m_block = consume_a_simple_block(tokens);
return rule;
}
// simple block with an associated token of <{-token>
if constexpr (IsSame<T, StyleComponentValueRule>) {
StyleComponentValueRule const& component_value = token;
if (component_value.is_block() && component_value.block().is_curly()) {
// Assign the block to the qualified rule’s block. Return the qualified rule.
rule->m_block = component_value.block();
return rule;
}
}
tokens.reconsume_current_input_token();
auto value = consume_a_component_value(tokens);
rule->m_prelude.append(value);
// anything else
{
// Reconsume the current input token.
tokens.reconsume_current_input_token();
// Consume a component value. Append the returned value to the qualified rule’s prelude.
rule->m_prelude.append(consume_a_component_value(tokens));
}
}
return rule;