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LibWeb: Extract attr() substitution into its own method

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No functional changes.
This commit is contained in:
Sam Atkins 2023-09-04 11:34:22 +01:00 • committed by Andreas Kling
parent 7d10484660
commit 9735f474a2
2 changed files with 41 additions and 33 deletions
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73
Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
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@ -6670,40 +6670,9 @@ bool Parser::expand_unresolved_values(DOM::Element& element, StringView property
auto const& value = source.next_token();
if (value.is_function()) {
if (value.function().name().equals_ignoring_ascii_case("attr"sv)) {
// https://drafts.csswg.org/css-values-5/#attr-substitution
TokenStream attr_contents { value.function().values() };
attr_contents.skip_whitespace();
if (!attr_contents.has_next_token())
if (!substitute_attr_function(element, property_name, value.function(), dest))
return false;
auto const& attr_name_token = attr_contents.next_token();
if (!attr_name_token.is(Token::Type::Ident))
return false;
auto attr_name = attr_name_token.token().ident();
auto attr_value = element.get_attribute(attr_name);
// 1. If the attr() function has a substitution value, replace the attr() function by the substitution value.
if (!attr_value.is_null()) {
// FIXME: attr() should also accept an optional type argument, not just strings.
dest.empend(Token::of_string(FlyString::from_deprecated_fly_string(attr_value).release_value_but_fixme_should_propagate_errors()));
continue;
}
// 2. Otherwise, if the attr() function has a fallback value as its last argument, replace the attr() function by the fallback value.
// If there are any var() or attr() references in the fallback, substitute them as well.
attr_contents.skip_whitespace();
if (attr_contents.has_next_token()) {
auto const& comma_token = attr_contents.next_token();
if (!comma_token.is(Token::Type::Comma))
return false;
attr_contents.skip_whitespace();
if (!expand_unresolved_values(element, property_name, attr_contents, dest))
return false;
continue;
}
// 3. Otherwise, the property containing the attr() function is invalid at computed-value time.
return false;
continue;
}
if (auto maybe_calc_value = parse_calculated_value(value); maybe_calc_value && maybe_calc_value->is_calculated()) {
@ -6765,4 +6734,42 @@ bool Parser::expand_unresolved_values(DOM::Element& element, StringView property
return true;
}
// https://drafts.csswg.org/css-values-5/#attr-substitution
bool Parser::substitute_attr_function(DOM::Element& element, StringView property_name, Function const& attr_function, Vector<ComponentValue>& dest)
{
TokenStream attr_contents { attr_function.values() };
attr_contents.skip_whitespace();
if (!attr_contents.has_next_token())
return false;
auto const& attr_name_token = attr_contents.next_token();
if (!attr_name_token.is(Token::Type::Ident))
return false;
auto attr_name = attr_name_token.token().ident();
auto attr_value = element.get_attribute(attr_name);
// 1. If the attr() function has a substitution value, replace the attr() function by the substitution value.
if (!attr_value.is_null()) {
// FIXME: attr() should also accept an optional type argument, not just strings.
dest.empend(Token::of_string(FlyString::from_deprecated_fly_string(attr_value).release_value_but_fixme_should_propagate_errors()));
return true;
}
// 2. Otherwise, if the attr() function has a fallback value as its last argument, replace the attr() function by the fallback value.
// If there are any var() or attr() references in the fallback, substitute them as well.
attr_contents.skip_whitespace();
if (attr_contents.has_next_token()) {
auto const& comma_token = attr_contents.next_token();
if (!comma_token.is(Token::Type::Comma))
return false;
attr_contents.skip_whitespace();
if (!expand_unresolved_values(element, property_name, attr_contents, dest))
return false;
return true;
}
// 3. Otherwise, the property containing the attr() function is invalid at computed-value time.
return false;
}
}