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LibWeb: Support non-fixed <random-value-sharing>

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This works by generating random values using XorShift128PlusRNG at
compute time and then caching them on the document using the relevant
random-caching-key
This commit is contained in:
Callum Law 2025-11-05 13:27:48 +13:00 • committed by Sam Atkins
parent 86e6aa0291
commit 12e8f503aa
Notes: github-actions[bot] 2025-12-01 11:01:47 +00:00
15 changed files with 226 additions and 54 deletions
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50
Libraries/LibWeb/CSS/Parser/ValueParsing.cpp
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@ -3798,6 +3798,9 @@ RefPtr<RandomValueSharingStyleValue const> Parser::parse_random_value_sharing(To
tokens.discard_whitespace();
if (!tokens.has_next_token())
return nullptr;
// fixed <number [0,1]>
if (tokens.next_token().is_ident("fixed"sv)) {
tokens.discard_a_token();
@ -3820,8 +3823,51 @@ RefPtr<RandomValueSharingStyleValue const> Parser::parse_random_value_sharing(To
return nullptr;
}
// FIXME: Support non-fixed values
return nullptr;
// [ [ auto | <dashed-ident> ] || element-shared ]
bool has_explicit_auto = false;
Optional<FlyString> dashed_ident;
bool element_shared = false;
while (tokens.has_next_token()) {
if (auto maybe_dashed_ident_value = parse_dashed_ident_value(tokens)) {
if (has_explicit_auto || dashed_ident.has_value())
return nullptr;
dashed_ident = maybe_dashed_ident_value->custom_ident();
tokens.discard_whitespace();
continue;
}
auto maybe_keyword_value = parse_keyword_value(tokens);
if (maybe_keyword_value && maybe_keyword_value->to_keyword() == Keyword::Auto) {
if (has_explicit_auto || dashed_ident.has_value())
return nullptr;
has_explicit_auto = true;
tokens.discard_whitespace();
continue;
}
if (maybe_keyword_value && maybe_keyword_value->to_keyword() == Keyword::ElementShared) {
if (element_shared)
return nullptr;
element_shared = true;
tokens.discard_whitespace();
continue;
}
return nullptr;
}
if (!dashed_ident.has_value())
return RandomValueSharingStyleValue::create_auto(random_value_sharing_auto_name(), element_shared);
return RandomValueSharingStyleValue::create_dashed_ident(dashed_ident.value(), element_shared);
}
// https://drafts.csswg.org/css-values-4/#typedef-dashed-ident