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LibWeb: Parse the position-try-fallbacks property
This commit is contained in:
Tim Ledbetter
Sam Atkins
parent
27cdf3a2c8
commit
2bde14b148
Notes:
github-actions[bot]
2025-10-07 10:31:51 +00:00
Author: https://github.com/tcl3
Commit: 2bde14b148
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/6363
Reviewed-by: https://github.com/AtkinsSJ ✅
13 changed files with 520 additions and 226 deletions
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@ -748,7 +748,10 @@ Parser::ParseErrorOr<NonnullRefPtr<StyleValue const>> Parser::parse_css_value(Pr
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if (auto parsed_value = parse_position_area_value(tokens); parsed_value && !tokens.has_next_token())
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return parsed_value.release_nonnull();
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return ParseError::SyntaxError;
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case PropertyID::PositionTryFallbacks:
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if (auto parsed_value = parse_position_try_fallbacks_value(tokens); parsed_value && !tokens.has_next_token())
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return parsed_value.release_nonnull();
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return ParseError::SyntaxError;
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case PropertyID::Quotes:
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if (auto parsed_value = parse_quotes_value(tokens); parsed_value && !tokens.has_next_token())
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return parsed_value.release_nonnull();
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@ -4170,17 +4173,108 @@ RefPtr<StyleValue const> Parser::parse_position_anchor_value(TokenStream<Compone
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return CustomIdentStyleValue::create(*dashed_ident);
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}
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// https://drafts.csswg.org/css-anchor-position/#position-area
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RefPtr<StyleValue const> Parser::parse_position_area_value(TokenStream<ComponentValue>& tokens)
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// https://drafts.csswg.org/css-anchor-position/#position-try-fallbacks
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RefPtr<StyleValue const> Parser::parse_position_try_fallbacks_value(TokenStream<ComponentValue>& tokens)
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{
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// none | <position-area>
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// none | [ [<dashed-ident> || <try-tactic>] | <position-area> ]#
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// none
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if (auto none_keyword_value = parse_all_as_single_keyword_value(tokens, Keyword::None))
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return none_keyword_value;
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if (auto none = parse_all_as_single_keyword_value(tokens, Keyword::None))
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return none;
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// <position-area>
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// https://drafts.csswg.org/css-anchor-position/#position-area-syntax
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return parse_comma_separated_value_list(tokens, [&](auto& inner_tokens) {
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return parse_single_position_try_fallbacks_value(inner_tokens);
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});
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}
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RefPtr<StyleValue const> Parser::parse_single_position_try_fallbacks_value(TokenStream<ComponentValue>& tokens)
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{
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// [<dashed-ident> || <try-tactic>] | <position-area>
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auto transaction = tokens.begin_transaction();
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tokens.discard_whitespace();
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if (auto position_area = parse_position_area(tokens)) {
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transaction.commit();
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return position_area;
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}
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Optional<FlyString> dashed_ident;
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RefPtr<StyleValue const> try_tactic;
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while (tokens.has_next_token()) {
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if (auto try_tactic_value = parse_try_tactic_value(tokens)) {
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if (try_tactic)
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return {};
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try_tactic = try_tactic_value.release_nonnull();
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} else if (auto maybe_dashed_ident = parse_dashed_ident(tokens); maybe_dashed_ident.has_value()) {
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if (dashed_ident.has_value())
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return {};
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dashed_ident = maybe_dashed_ident.release_value();
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} else {
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break;
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}
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tokens.discard_whitespace();
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}
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StyleValueVector values;
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if (dashed_ident.has_value())
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values.append(CustomIdentStyleValue::create(dashed_ident.release_value()));
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if (try_tactic)
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values.append(try_tactic.release_nonnull());
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if (values.is_empty())
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return {};
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transaction.commit();
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return StyleValueList::create(move(values), StyleValueList::Separator::Space);
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}
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// https://drafts.csswg.org/css-anchor-position-1/#typedef-position-try-fallbacks-try-tactic
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RefPtr<StyleValue const> Parser::parse_try_tactic_value(TokenStream<ComponentValue>& tokens)
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{
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// <try-tactic> = flip-block || flip-inline || flip-start
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auto transaction = tokens.begin_transaction();
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tokens.discard_whitespace();
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StyleValueVector values;
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bool has_flip_block = false;
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bool has_flip_inline = false;
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bool has_flip_start = false;
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while (tokens.has_next_token()) {
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auto keyword_value = parse_keyword_value(tokens);
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if (!keyword_value)
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break;
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switch (keyword_value->to_keyword()) {
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case Keyword::FlipBlock:
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if (has_flip_block)
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return {};
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has_flip_block = true;
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values.append(keyword_value.release_nonnull());
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break;
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case Keyword::FlipInline:
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if (has_flip_inline)
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return {};
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has_flip_inline = true;
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values.append(keyword_value.release_nonnull());
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break;
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case Keyword::FlipStart:
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if (has_flip_start)
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return {};
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has_flip_start = true;
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values.append(keyword_value.release_nonnull());
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break;
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default:
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return {};
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}
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tokens.discard_whitespace();
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}
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transaction.commit();
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if (values.is_empty())
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return {};
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return StyleValueList::create(move(values), StyleValueList::Separator::Space);
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}
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// https://drafts.csswg.org/css-anchor-position/#position-area-syntax
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RefPtr<StyleValue const> Parser::parse_position_area(TokenStream<ComponentValue>& tokens)
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{
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// <position-area> = [
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// [ left | center | right | span-left | span-right
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// | x-start | x-end | span-x-start | span-x-end
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@ -4367,7 +4461,7 @@ RefPtr<StyleValue const> Parser::parse_position_area_value(TokenStream<Component
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transaction.commit();
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// If only a single keyword is given, it behaves as if the second keyword is span-all if the given keyword is
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// unambigous about its axis.
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// unambiguous about its axis.
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// These conditions ensure the span-all keyword is omitted when it would be implied.
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if (!is_axis_ambiguous(first.as_keyword().keyword()) && second.as_keyword().keyword() == Keyword::SpanAll)
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return first;
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@ -4382,16 +4476,14 @@ RefPtr<StyleValue const> Parser::parse_position_area_value(TokenStream<Component
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return nullptr;
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tokens.discard_whitespace();
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if (!tokens.has_next_token()) {
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auto second_keyword_value = parse_keyword_value(tokens);
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if (!second_keyword_value) {
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auto first_position_area_keyword = keyword_to_position_area(first_keyword_value->as_keyword().keyword());
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if (!first_position_area_keyword.has_value())
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return nullptr;
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transaction.commit();
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return first_keyword_value;
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}
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auto second_keyword_value = parse_keyword_value(tokens);
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if (!second_keyword_value)
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return nullptr;
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auto first_keyword = first_keyword_value->as_keyword().keyword();
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auto second_keyword = second_keyword_value->as_keyword().keyword();
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@ -4419,6 +4511,19 @@ RefPtr<StyleValue const> Parser::parse_position_area_value(TokenStream<Component
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return nullptr;
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}
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// https://drafts.csswg.org/css-anchor-position/#position-area
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RefPtr<StyleValue const> Parser::parse_position_area_value(TokenStream<ComponentValue>& tokens)
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{
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// none | <position-area>
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// none
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if (auto none_keyword_value = parse_all_as_single_keyword_value(tokens, Keyword::None))
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return none_keyword_value;
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// <position-area>
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return parse_position_area(tokens);
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}
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RefPtr<StyleValue const> Parser::parse_quotes_value(TokenStream<ComponentValue>& tokens)
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{
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// https://www.w3.org/TR/css-content-3/#quotes-property
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