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LibWeb: Parse the view-timeline-inset CSS property

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Callum Law 2025-11-21 19:29:31 +13:00 • committed by Sam Atkins
parent 21ff35691a
commit e093c76eea
Notes: github-actions[bot] 2025-11-28 13:26:03 +00:00
13 changed files with 191 additions and 0 deletions
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39
Libraries/LibWeb/CSS/Parser/ValueParsing.cpp
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@ -1377,6 +1377,43 @@ RefPtr<StyleValue const> Parser::parse_time_percentage_value(TokenStream<Compone
return nullptr;
}
// https://drafts.csswg.org/scroll-animations-1/#view-timeline-inset
RefPtr<StyleValue const> Parser::parse_view_timeline_inset_value(TokenStream<ComponentValue>& tokens)
{
// [ [ auto | <length-percentage> ]{1,2} ]
auto transaction = tokens.begin_transaction();
StyleValueVector inset_values;
while (tokens.has_next_token() && inset_values.size() < 2) {
tokens.discard_whitespace();
if (tokens.next_token().is_ident("auto"sv)) {
tokens.discard_a_token(); // auto
inset_values.append(KeywordStyleValue::create(Keyword::Auto));
continue;
}
if (auto length_percentage = parse_length_percentage_value(tokens)) {
inset_values.append(length_percentage.release_nonnull());
continue;
}
break;
}
if (inset_values.is_empty())
return nullptr;
transaction.commit();
// If the second value is omitted, it is set to the first.
if (inset_values.size() == 1)
return StyleValueList::create({ inset_values[0], inset_values[0] }, StyleValueList::Separator::Space);
return StyleValueList::create(move(inset_values), StyleValueList::Separator::Space);
}
RefPtr<StyleValue const> Parser::parse_keyword_value(TokenStream<ComponentValue>& tokens)
{
tokens.discard_whitespace();
@ -5049,6 +5086,8 @@ RefPtr<StyleValue const> Parser::parse_value(ValueType value_type, TokenStream<C
return parse_transform_list_value(tokens);
case ValueType::Url:
return parse_url_value(tokens);
case ValueType::ViewTimelineInset:
return parse_view_timeline_inset_value(tokens);
}
VERIFY_NOT_REACHED();
}