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LibWeb: Implement basic CSS random() function

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At the moment this is limited to only fixed value sharing and does not
support step values
This commit is contained in:
Callum Law 2025-11-04 13:35:17 +13:00 • committed by Sam Atkins
parent 8944130fde
commit 2a5e389f63
Notes: github-actions[bot] 2025-12-01 11:02:05 +00:00
17 changed files with 380 additions and 31 deletions
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38
Libraries/LibWeb/CSS/Parser/ValueParsing.cpp
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@ -60,6 +60,7 @@
#include <LibWeb/CSS/StyleValues/PositionStyleValue.h>
#include <LibWeb/CSS/StyleValues/RGBColorStyleValue.h>
#include <LibWeb/CSS/StyleValues/RadialGradientStyleValue.h>
#include <LibWeb/CSS/StyleValues/RandomValueSharingStyleValue.h>
#include <LibWeb/CSS/StyleValues/RatioStyleValue.h>
#include <LibWeb/CSS/StyleValues/RectStyleValue.h>
#include <LibWeb/CSS/StyleValues/RepeatStyleStyleValue.h>
@ -3789,6 +3790,40 @@ RefPtr<CustomIdentStyleValue const> Parser::parse_custom_ident_value(TokenStream
return nullptr;
}
// https://drafts.csswg.org/css-values-5/#typedef-random-value-sharing
RefPtr<RandomValueSharingStyleValue const> Parser::parse_random_value_sharing(TokenStream<ComponentValue>& tokens)
{
// <random-value-sharing> = [ [ auto | <dashed-ident> ] || element-shared ] | fixed <number [0,1]>
auto transaction = tokens.begin_transaction();
tokens.discard_whitespace();
// fixed <number [0,1]>
if (tokens.next_token().is_ident("fixed"sv)) {
tokens.discard_a_token();
tokens.discard_whitespace();
auto context_guard = push_temporary_value_parsing_context(SpecialContext::RandomValueSharingFixedValue);
if (auto fixed_value = parse_number_value(tokens)) {
tokens.discard_whitespace();
if (tokens.has_next_token())
return nullptr;
if (fixed_value->is_number() && (fixed_value->as_number().number() < 0 || fixed_value->as_number().number() >= 1))
return nullptr;
transaction.commit();
return RandomValueSharingStyleValue::create_fixed(fixed_value.release_nonnull());
}
return nullptr;
}
// FIXME: Support non-fixed values
return nullptr;
}
// https://drafts.csswg.org/css-values-4/#typedef-dashed-ident
Optional<FlyString> Parser::parse_dashed_ident(TokenStream<ComponentValue>& tokens)
{
@ -4384,6 +4419,9 @@ RefPtr<CalculatedStyleValue const> Parser::parse_calculated_value(ComponentValue
case SpecialContext::CubicBezierFunctionXCoordinate:
// Coordinates on the X axis must be between 0 and 1
return CalculationContext { .accepted_type_ranges = { { ValueType::Number, { 0, 1 } } } };
case SpecialContext::RandomValueSharingFixedValue:
// Fixed values have to be less than one and numbers serialize with six digits of precision
return CalculationContext { .accepted_type_ranges = { { ValueType::Number, { 0, 0.999999 } } } };
case SpecialContext::StepsIntervalsJumpNone:
return CalculationContext { .resolve_numbers_as_integers = true, .accepted_type_ranges = { { ValueType::Integer, { 2, NumericLimits<float>::max() } } } };
case SpecialContext::StepsIntervalsNormal: