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LibWeb: Rough implementation of CSS namespace rule

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This provides a rough implementation of the CSS @namespace rule.
Currently we just support default namespaces, namespace prefixes
are still to come.
This commit is contained in:
Jonah 2023-07-29 11:51:15 -05:00 • committed by Sam Atkins
parent 3f7d97f098
commit 60e35f2a97
18 changed files with 266 additions and 3 deletions
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32
Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
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@ -17,6 +17,7 @@
#include <LibWeb/CSS/CSSKeyframeRule.h>
#include <LibWeb/CSS/CSSKeyframesRule.h>
#include <LibWeb/CSS/CSSMediaRule.h>
#include <LibWeb/CSS/CSSNamespaceRule.h>
#include <LibWeb/CSS/CSSStyleDeclaration.h>
#include <LibWeb/CSS/CSSStyleRule.h>
#include <LibWeb/CSS/CSSStyleSheet.h>
@ -3241,6 +3242,37 @@ CSSRule* Parser::convert_to_rule(NonnullRefPtr<Rule> rule)
return CSSKeyframesRule::create(m_context.realm(), name, move(keyframes)).release_value_but_fixme_should_propagate_errors();
}
if (rule->at_rule_name().equals_ignoring_ascii_case("namespace"sv)) {
// https://drafts.csswg.org/css-namespaces/#syntax
auto token_stream = TokenStream { rule->prelude() };
token_stream.skip_whitespace();
auto token = token_stream.next_token();
Optional<StringView> prefix = {};
if (token.is(Token::Type::Ident)) {
prefix = token.token().ident();
token_stream.skip_whitespace();
token = token_stream.next_token();
}
DeprecatedString namespace_uri;
if (token.is(Token::Type::String)) {
namespace_uri = token.token().string();
} else if (auto url = parse_url_function(token, AllowedDataUrlType::None); url.has_value()) {
namespace_uri = url.value().to_deprecated_string();
} else {
dbgln_if(CSS_PARSER_DEBUG, "CSSParser: @namespace rule invalid; discarding.");
return {};
}
token_stream.skip_whitespace();
if (token_stream.has_next_token()) {
dbgln_if(CSS_PARSER_DEBUG, "CSSParser: @namespace rule invalid; discarding.");
return {};
}
return CSSNamespaceRule::create(m_context.realm(), prefix, namespace_uri).release_value_but_fixme_should_propagate_errors();
}
// FIXME: More at rules!
dbgln_if(CSS_PARSER_DEBUG, "Unrecognized CSS at-rule: @{}", rule->at_rule_name());