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LibWeb: Implement @supports selector(.foo)
This is defined in https://www.w3.org/TR/css-conditional-4/#at-supports-ext which just became a CR. :^)
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4 changed files with 93 additions and 9 deletions
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@ -1,7 +1,7 @@
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/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2020-2021, the SerenityOS developers.
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* Copyright (c) 2021, Sam Atkins <atkinssj@serenityos.org>
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* Copyright (c) 2021-2022, Sam Atkins <atkinssj@serenityos.org>
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* Copyright (c) 2021, Tobias Christiansen <tobyase@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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@ -1309,12 +1309,23 @@ Optional<Supports::Feature> Parser::parse_supports_feature(TokenStream<StyleComp
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// `<supports-decl>`
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if (first_token.is_block() && first_token.block().is_paren()) {
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TokenStream block_tokens { first_token.block().values() };
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// FIXME: Parsing and then converting back to a string is weird.
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if (auto declaration = consume_a_declaration(block_tokens); declaration.has_value()) {
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return Supports::Feature {
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.declaration = declaration->to_string()
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Supports::Declaration { declaration->to_string() }
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};
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}
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}
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// `<supports-selector-fn>`
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if (first_token.is_function() && first_token.function().name().equals_ignoring_case("selector"sv)) {
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// FIXME: Parsing and then converting back to a string is weird.
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StringBuilder builder;
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for (auto const& item : first_token.function().values())
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builder.append(item.to_string());
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return Supports::Feature {
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Supports::Selector { builder.to_string() }
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};
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}
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tokens.rewind_to_position(start_position);
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return {};
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