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LibWeb: Add MathML Element presentational hints

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Lorenz A 2025-09-20 22:54:45 +02:00 • committed by Jelle Raaijmakers
parent f1571c4217
commit 96b34ea744
Notes: github-actions[bot] 2025-10-21 23:48:01 +00:00
13 changed files with 380 additions and 2 deletions
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71
Libraries/LibWeb/MathML/MathMLElement.cpp
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@ -6,6 +6,13 @@
#include <LibWeb/Bindings/ExceptionOrUtils.h>
#include <LibWeb/Bindings/MathMLElementPrototype.h>
#include <LibWeb/CSS/Parser/Parser.h>
#include <LibWeb/CSS/StyleValues/IntegerStyleValue.h>
#include <LibWeb/CSS/StyleValues/KeywordStyleValue.h>
#include <LibWeb/CSS/StyleValues/MathDepthStyleValue.h>
#include <LibWeb/HTML/Numbers.h>
#include <LibWeb/HTML/Parser/HTMLParser.h>
#include <LibWeb/MathML/AttributeNames.h>
#include <LibWeb/MathML/MathMLElement.h>
#include <LibWeb/MathML/TagNames.h>
@ -59,4 +66,68 @@ void MathMLElement::visit_edges(JS::Cell::Visitor& visitor)
HTMLOrSVGElement::visit_edges(visitor);
}
bool MathMLElement::is_presentational_hint(FlyString const& name) const
{
return first_is_one_of(name, AttributeNames::dir, AttributeNames::mathcolor, AttributeNames::mathbackground,
AttributeNames::mathsize, AttributeNames::displaystyle, AttributeNames::scriptlevel);
}
void MathMLElement::apply_presentational_hints(GC::Ref<CSS::CascadedProperties> cascaded_properties) const
{
for_each_attribute([&](auto& name, auto& value) {
if (name == AttributeNames::dir) {
// https://w3c.github.io/mathml-core/#attributes-common-to-html-and-mathml-elements
// The dir attribute, if present, must be an ASCII case-insensitive match to ltr or rtl. In that case, the
// user agent is expected to treat the attribute as a presentational hint setting the element's direction
// property to the corresponding value. More precisely, an ASCII case-insensitive match to rtl is mapped to
// rtl while an ASCII case-insensitive match to ltr is mapped to ltr.
if (value.equals_ignoring_ascii_case("ltr"sv))
cascaded_properties->set_property_from_presentational_hint(CSS::PropertyID::Direction, CSS::KeywordStyleValue::create(CSS::Keyword::Ltr));
else if (value.equals_ignoring_ascii_case("rtl"sv))
cascaded_properties->set_property_from_presentational_hint(CSS::PropertyID::Direction, CSS::KeywordStyleValue::create(CSS::Keyword::Rtl));
} else if (name == AttributeNames::mathcolor) {
// https://w3c.github.io/mathml-core/#legacy-mathml-style-attributes
// The mathcolor and mathbackground attributes, if present, must have a value that is a <color>. In that case,
// the user agent is expected to treat these attributes as a presentational hint setting the element's color
// and background-color properties to the corresponding values.
if (auto parsed_value = parse_css_value(CSS::Parser::ParsingParams { document() }, value, CSS::PropertyID::Color))
cascaded_properties->set_property_from_presentational_hint(CSS::PropertyID::Color, parsed_value.release_nonnull());
} else if (name == AttributeNames::mathbackground) {
if (auto parsed_value = parse_css_value(CSS::Parser::ParsingParams { document() }, value, CSS::PropertyID::BackgroundColor))
cascaded_properties->set_property_from_presentational_hint(CSS::PropertyID::BackgroundColor, parsed_value.release_nonnull());
} else if (name == AttributeNames::mathsize) {
// https://w3c.github.io/mathml-core/#dfn-mathsize
// The mathsize attribute, if present, must have a value that is a valid <length-percentage>.
// In that case, the user agent is expected to treat the attribute as a presentational hint setting the
// element's font-size property to the corresponding value.
if (auto parsed_value = HTML::parse_dimension_value(value))
cascaded_properties->set_property_from_presentational_hint(CSS::PropertyID::FontSize, parsed_value.release_nonnull());
} else if (name == AttributeNames::displaystyle) {
// https://w3c.github.io/mathml-core/#dfn-displaystyle
// The displaystyle attribute, if present, must have a value that is a boolean. In that case, the user agent
// is expected to treat the attribute as a presentational hint setting the element's math-style property to
// the corresponding value. More precisely, an ASCII case-insensitive match to true is mapped to normal while
// an ASCII case-insensitive match to false is mapped to compact.
if (value.equals_ignoring_ascii_case("true"sv))
cascaded_properties->set_property_from_presentational_hint(CSS::PropertyID::MathStyle, CSS::KeywordStyleValue::create(CSS::Keyword::Normal));
else if (value.equals_ignoring_ascii_case("false"sv))
cascaded_properties->set_property_from_presentational_hint(CSS::PropertyID::MathStyle, CSS::KeywordStyleValue::create(CSS::Keyword::Compact));
} else if (name == AttributeNames::scriptlevel) {
// https://w3c.github.io/mathml-core/#dfn-scriptlevel
// The scriptlevel attribute, if present, must have value +<U>, -<U> or <U> where <U> is an unsigned-integer.
// In that case the user agent is expected to treat the scriptlevel attribute as a presentational hint
// setting the element's math-depth property to the corresponding value. More precisely, +<U>, -<U> and <U>
// are respectively mapped to add(<U>) add(<-U>) and <U>.
if (Optional<StringView> parsed_value = HTML::parse_integer_digits(value); parsed_value.has_value()) {
auto string_value = parsed_value.value();
if (auto value = parsed_value->to_number<i32>(TrimWhitespace::No); value.has_value()) {
auto style_value = string_value[0] == '+' || string_value[0] == '-' ? CSS::MathDepthStyleValue::create_add(CSS::IntegerStyleValue::create(value.release_value()))
: CSS::MathDepthStyleValue::create_integer(CSS::IntegerStyleValue::create(value.release_value()));
cascaded_properties->set_property_from_presentational_hint(CSS::PropertyID::MathDepth, style_value);
}
}
}
});
}
}