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https://github.com/RGBCube/serenity
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LibWeb: Allow calc() values in image sizes
attribute
Note that we currently can't resolve calc() values without a layout node, so when normalizing an image's source set, we'll flush any pending layout updates and hope that gives us an up-to-date layout node. I've left a FIXME about implementing this in a more elegant and less layout-thrashy way, as that will require more architectural work.
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7 changed files with 77 additions and 28 deletions
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@ -3460,6 +3460,23 @@ Optional<Parser::Dimension> Parser::parse_dimension(ComponentValue const& compon
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return {};
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}
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Optional<LengthOrCalculated> Parser::parse_source_size_value(ComponentValue const& component_value)
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{
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if (component_value.is(Token::Type::Ident) && component_value.token().ident().equals_ignoring_ascii_case("auto"sv)) {
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return LengthOrCalculated { Length::make_auto() };
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}
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if (auto dynamic_value = parse_dynamic_value(component_value); !dynamic_value.is_error() && dynamic_value.value()) {
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return LengthOrCalculated { dynamic_value.value()->as_calculated().as_calculated() };
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}
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if (auto length = parse_length(component_value); length.has_value()) {
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return LengthOrCalculated { length.release_value() };
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}
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return {};
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}
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Optional<Length> Parser::parse_length(ComponentValue const& component_value)
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{
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auto dimension = parse_dimension(component_value);
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@ -8152,44 +8169,48 @@ private:
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};
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// https://html.spec.whatwg.org/multipage/images.html#parsing-a-sizes-attribute
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Length Parser::Parser::parse_as_sizes_attribute()
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LengthOrCalculated Parser::Parser::parse_as_sizes_attribute()
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{
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Optional<Length> size;
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// When asked to parse a sizes attribute from an element,
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// parse a comma-separated list of component values from the value of the element's sizes attribute
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// (or the empty string, if the attribute is absent), and let unparsed sizes list be the result.
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// 1. Let unparsed sizes list be the result of parsing a comma-separated list of component values
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// from the value of element's sizes attribute (or the empty string, if the attribute is absent).
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auto unparsed_sizes_list = parse_a_comma_separated_list_of_component_values(m_token_stream);
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// For each unparsed size in unparsed sizes list:
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// 2. Let size be null.
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Optional<LengthOrCalculated> size;
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// 3. For each unparsed size in unparsed sizes list:
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for (auto& unparsed_size : unparsed_sizes_list) {
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// 1. Remove all consecutive <whitespace-token>s from the end of unparsed size.
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// If unparsed size is now empty, that is a parse error; continue.
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while (!unparsed_size.is_empty() && unparsed_size.last().is_token() && unparsed_size.last().token().is(Token::Type::Whitespace))
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unparsed_size.take_last();
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if (unparsed_size.is_empty())
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if (unparsed_size.is_empty()) {
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log_parse_error();
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continue;
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}
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// 2. If the last component value in unparsed size is a valid non-negative <source-size-value>,
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// let size be its value and remove the component value from unparsed size.
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// FIXME: Any CSS function other than the math functions is invalid.
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// Otherwise, there is a parse error; continue.
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auto length = parse_length(unparsed_size.last());
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if (length.has_value() && length.value().raw_value() >= 0) {
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size = length.value();
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if (auto source_size_value = parse_source_size_value(unparsed_size.last()); source_size_value.has_value()) {
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size = source_size_value.value();
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unparsed_size.take_last();
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} else {
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log_parse_error();
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continue;
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}
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// 3. Remove all consecutive <whitespace-token>s from the end of unparsed size.
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// If unparsed size is now empty, return size and exit this algorithm.
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// If this was not the last item in unparsed sizes list, that is a parse error.
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while (!unparsed_size.is_empty() && unparsed_size.last().is_token() && unparsed_size.last().token().is(Token::Type::Whitespace))
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unparsed_size.take_last();
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// If unparsed size is now empty, then return size.
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if (unparsed_size.is_empty())
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return size.value();
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// FIXME: If this was not the keyword auto and it was not the last item in unparsed sizes list, that is a parse error.
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// 4. Parse the remaining component values in unparsed size as a <media-condition>.
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// If it does not parse correctly, or it does parse correctly but the <media-condition> evaluates to false, continue.
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TokenStream<ComponentValue> token_stream { unparsed_size };
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@ -8199,6 +8220,10 @@ Length Parser::Parser::parse_as_sizes_attribute()
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} else {
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continue;
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}
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// 5. If size is not auto, then return size.
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if (size.value().is_calculated() || !size.value().value().is_auto())
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return size.value();
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}
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return Length(100, Length::Type::Vw);
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