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LibWeb/CSS: Add flag to disable create-internal-rep type checking

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CSSTransformComponents hold other CSSStyleValues as their parameters. We
want to be able to create internal representations from those parameters
without them caring if they would be valid when directly assigned to the
property.

This is a temporary solution to make transform functions work. To be
completely correct, we need to know what is allowed in that context,
along with value ranges - a combination of the contexts we create when
parsing, and when computing calculations. For transform functions, this
doesn't matter, as there's no limit to the range of allowed values.
This commit is contained in:
Sam Atkins
2025-10-13 16:37:54 +01:00
parent 35fd3bda79
commit 5178d1ebe3
Notes: github-actions[bot] 2025-10-14 12:42:59 +00:00 
Author: https://github.com/AtkinsSJ
Commit: https://github.com/LadybirdBrowser/ladybird/commit/5178d1ebe3d
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/6466
13 changed files with 52 additions and 18 deletions
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33
Libraries/LibWeb/CSS/CSSUnitValue.cpp
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@@ -326,7 +326,7 @@ static Optional<CalculationNode::NumericValue> create_numeric_value(double value
}
// https://drafts.css-houdini.org/css-typed-om-1/#create-an-internal-representation
WebIDL::ExceptionOr<NonnullRefPtr<StyleValue const>> CSSUnitValue::create_an_internal_representation(PropertyNameAndID const& property) const
WebIDL::ExceptionOr<NonnullRefPtr<StyleValue const>> CSSUnitValue::create_an_internal_representation(PropertyNameAndID const& property, PerformTypeCheck perform_type_check) const
{
// If value is a CSSStyleValue subclass,
// If value does not match the grammar of a list-valued property iteration of property, throw a TypeError.
@@ -338,7 +338,7 @@ WebIDL::ExceptionOr<NonnullRefPtr<StyleValue const>> CSSUnitValue::create_an_int
// Return the value.
// NB: We store all custom properties as UnresolvedStyleValue, so we always need to create one here.
if (property.is_custom_property()) {
if (perform_type_check == PerformTypeCheck::Yes && property.is_custom_property()) {
auto token = [this]() {
if (m_unit == "number"_fly_string)
return Parser::Token::create_number(Number { Number::Type::Number, m_value });
@@ -361,6 +361,35 @@ WebIDL::ExceptionOr<NonnullRefPtr<StyleValue const>> CSSUnitValue::create_an_int
return WebIDL::SimpleException { WebIDL::SimpleExceptionType::TypeError, MUST(String::formatted("Unrecognized unit '{}'.", m_unit)) };
}
if (perform_type_check == PerformTypeCheck::No) {
return value->visit(
[&](Number const& number) -> RefPtr<StyleValue const> {
return NumberStyleValue::create(number.value());
},
[&](Percentage const& percentage) -> RefPtr<StyleValue const> {
return PercentageStyleValue::create(percentage);
},
[&](Angle const& angle) -> RefPtr<StyleValue const> {
return AngleStyleValue::create(angle);
},
[&](Flex const& flex) -> RefPtr<StyleValue const> {
return FlexStyleValue::create(flex);
},
[&](Frequency const& frequency) -> RefPtr<StyleValue const> {
return FrequencyStyleValue::create(frequency);
},
[&](Length const& length) -> RefPtr<StyleValue const> {
return LengthStyleValue::create(length);
},
[&](Resolution const& resolution) -> RefPtr<StyleValue const> {
return ResolutionStyleValue::create(resolution);
},
[&](Time const& time) -> RefPtr<StyleValue const> {
return TimeStyleValue::create(time);
})
.release_nonnull();
}
// FIXME: Check types allowed by registered custom properties.
auto style_value = value->visit(
[&](Number const& number) -> RefPtr<StyleValue const> {