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