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LibWeb: Implement @supports rule :^)

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The main thing missing is that we don't serialize the supports clause,
but for actually using a `@supports (something: cool) {}` rule in CSS,
it works!
This commit is contained in:
Sam Atkins 2021-10-08 17:48:14 +01:00 • committed by Andreas Kling
parent 439d978ea5
commit 57a25139a5
9 changed files with 129 additions and 0 deletions
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24
Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
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@ -16,6 +16,7 @@
#include <LibWeb/CSS/CSSStyleDeclaration.h>
#include <LibWeb/CSS/CSSStyleRule.h>
#include <LibWeb/CSS/CSSStyleSheet.h>
#include <LibWeb/CSS/CSSSupportsRule.h>
#include <LibWeb/CSS/Parser/DeclarationOrAtRule.h>
#include <LibWeb/CSS/Parser/Parser.h>
#include <LibWeb/CSS/Parser/StyleBlockRule.h>
@ -1735,6 +1736,29 @@ RefPtr<CSSRule> Parser::convert_to_rule(NonnullRefPtr<StyleRule> rule)
return CSSImportRule::create(url.value());
else
dbgln("Unable to parse url from @import rule");
} else if (rule->m_name.equals_ignoring_case("supports"sv)) {
auto supports_tokens = TokenStream { rule->prelude() };
auto supports = parse_a_supports(supports_tokens);
if (!supports) {
if constexpr (CSS_PARSER_DEBUG) {
dbgln("CSSParser: @supports rule invalid; discarding.");
supports_tokens.dump_all_tokens();
}
return {};
}
auto child_tokens = TokenStream { rule->block().values() };
auto parser_rules = consume_a_list_of_rules(child_tokens, false);
NonnullRefPtrVector<CSSRule> child_rules;
for (auto& raw_rule : parser_rules) {
if (auto child_rule = convert_to_rule(raw_rule))
child_rules.append(*child_rule);
}
return CSSSupportsRule::create(supports.release_nonnull(), move(child_rules));
} else {
dbgln("Unrecognized CSS at-rule: @{}", rule->m_name);
}