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LibWeb: Spec-comment parse_a_component_value()

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Sam Atkins 2022-03-30 12:32:42 +01:00 • committed by Andreas Kling
parent bcf4254331
commit 34b3c09462
2 changed files with 16 additions and 15 deletions
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27
Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
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@ -1979,31 +1979,32 @@ Vector<DeclarationOrAtRule> Parser::parse_a_list_of_declarations(TokenStream<T>&
return consume_a_list_of_declarations(tokens);
}
Optional<StyleComponentValueRule> Parser::parse_as_component_value()
{
return parse_a_component_value(m_token_stream);
}
// 5.3.9. Parse a component value
// https://www.w3.org/TR/css-syntax-3/#parse-component-value
template<typename T>
Optional<StyleComponentValueRule> Parser::parse_a_component_value(TokenStream<T>& tokens)
{
// To parse a component value from input:
// 1. Normalize input, and set input to the result.
// Note: This is done when initializing the Parser.
// 2. While the next input token from input is a <whitespace-token>, consume the next input token from input.
tokens.skip_whitespace();
auto& token = tokens.peek_token();
if (token.is(Token::Type::EndOfFile)) {
// 3. If the next input token from input is an <EOF-token>, return a syntax error.
if (tokens.peek_token().is(Token::Type::EndOfFile))
return {};
}
// 4. Consume a component value from input and let value be the return value.
auto value = consume_a_component_value(tokens);
// 5. While the next input token from input is a <whitespace-token>, consume the next input token.
tokens.skip_whitespace();
auto& maybe_eof = tokens.peek_token();
if (maybe_eof.is(Token::Type::EndOfFile)) {
// 6. If the next input token from input is an <EOF-token>, return value. Otherwise, return a syntax error.
if (tokens.peek_token().is(Token::Type::EndOfFile))
return value;
}
return {};
}