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LibWeb: Parse scroll() for the animation-timeline CSS property

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Callum Law 2025-11-22 16:58:10 +13:00 • committed by Sam Atkins
parent 5bbcd0a48f
commit 7d70714eac
Notes: github-actions[bot] 2025-11-28 13:25:32 +00:00
16 changed files with 181 additions and 34 deletions
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58
Libraries/LibWeb/CSS/Parser/ValueParsing.cpp
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@ -64,6 +64,7 @@
#include <LibWeb/CSS/StyleValues/RectStyleValue.h>
#include <LibWeb/CSS/StyleValues/RepeatStyleStyleValue.h>
#include <LibWeb/CSS/StyleValues/ResolutionStyleValue.h>
#include <LibWeb/CSS/StyleValues/ScrollFunctionStyleValue.h>
#include <LibWeb/CSS/StyleValues/StringStyleValue.h>
#include <LibWeb/CSS/StyleValues/StyleValueList.h>
#include <LibWeb/CSS/StyleValues/SuperellipseStyleValue.h>
@ -1429,6 +1430,61 @@ RefPtr<StyleValue const> Parser::parse_keyword_value(TokenStream<ComponentValue>
return nullptr;
}
// https://drafts.csswg.org/scroll-animations-1/#funcdef-scroll
RefPtr<ScrollFunctionStyleValue const> Parser::parse_scroll_function_value(TokenStream<ComponentValue>& tokens)
{
// <scroll()> = scroll( [ <scroller> || <axis> ]? )
auto transaction = tokens.begin_transaction();
auto const& function_token = tokens.consume_a_token();
if (!function_token.is_function("scroll"sv))
return nullptr;
Optional<Scroller> scroller;
Optional<Axis> axis;
auto argument_tokens = TokenStream { function_token.function().value };
while (argument_tokens.has_next_token()) {
tokens.discard_whitespace();
if (!argument_tokens.has_next_token())
break;
auto keyword_value = parse_keyword_value(argument_tokens);
if (!keyword_value)
return nullptr;
if (auto maybe_scroller = keyword_to_scroller(keyword_value->to_keyword()); maybe_scroller.has_value()) {
if (scroller.has_value())
return nullptr;
scroller = maybe_scroller;
continue;
}
if (auto maybe_axis = keyword_to_axis(keyword_value->to_keyword()); maybe_axis.has_value()) {
if (axis.has_value())
return nullptr;
axis = maybe_axis;
continue;
}
return nullptr;
}
// By default, scroll() references the block axis of the nearest ancestor scroll container.
if (!scroller.has_value())
scroller = Scroller::Nearest;
if (!axis.has_value())
axis = Axis::Block;
transaction.commit();
return ScrollFunctionStyleValue::create(scroller.value(), axis.value());
}
// https://www.w3.org/TR/CSS2/visufx.html#value-def-shape
RefPtr<StyleValue const> Parser::parse_rect_value(TokenStream<ComponentValue>& tokens)
{
@ -5074,6 +5130,8 @@ RefPtr<StyleValue const> Parser::parse_value(ValueType value_type, TokenStream<C
return parse_rect_value(tokens);
case ValueType::Resolution:
return parse_resolution_value(tokens);
case ValueType::ScrollFunction:
return parse_scroll_function_value(tokens);
case ValueType::String:
return parse_string_value(tokens);
case ValueType::Time: