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LibWeb: Parse CSS Supports

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... according to
https://www.w3.org/TR/css-conditional-3/#typedef-supports-condition

This works very similarly to `@media`, but is different enough to
require its own parsing. (Though, the draft of Conditional-4 currently
mentions combining the two into a `@when` rule.)

Made some small changes to parsing code to make this work. Notably,
making `consume_a_declaration()` fail gracefully instead of
`VERIFY()`ing.
This commit is contained in:
Sam Atkins 2021-10-08 15:54:16 +01:00 • committed by Andreas Kling
parent 87a30418bf
commit b1f8a73a05
2 changed files with 203 additions and 1 deletions
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17
Userland/Libraries/LibWeb/CSS/Parser/Parser.h
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@ -12,6 +12,7 @@
#include <AK/RefPtr.h>
#include <AK/Result.h>
#include <AK/Vector.h>
#include <LibWeb/CSS/CSSStyleDeclaration.h>
#include <LibWeb/CSS/MediaQuery.h>
#include <LibWeb/CSS/Parser/DeclarationOrAtRule.h>
#include <LibWeb/CSS/Parser/StyleBlockRule.h>
@ -22,6 +23,7 @@
#include <LibWeb/CSS/Parser/Tokenizer.h>
#include <LibWeb/CSS/Selector.h>
#include <LibWeb/CSS/StyleValue.h>
#include <LibWeb/CSS/Supports.h>
namespace Web::CSS {
@ -104,6 +106,8 @@ public:
NonnullRefPtrVector<MediaQuery> parse_as_media_query_list();
RefPtr<MediaQuery> parse_as_media_query();
RefPtr<Supports> parse_as_supports();
RefPtr<StyleValue> parse_as_css_value(PropertyID);
// FIXME: This is a hack, while CSS::Supports is using a StyleDeclarationRule
@ -142,6 +146,8 @@ private:
Result<SelectorList, ParsingResult> parse_a_relative_selector_list(TokenStream<T>&);
template<typename T>
NonnullRefPtrVector<MediaQuery> parse_a_media_query_list(TokenStream<T>&);
template<typename T>
RefPtr<Supports> parse_a_supports(TokenStream<T>&);
Optional<Selector::SimpleSelector::ANPlusBPattern> parse_a_n_plus_b_pattern(TokenStream<StyleComponentValueRule>&);
@ -177,6 +183,12 @@ private:
template<typename T>
[[nodiscard]] NonnullRefPtr<StyleFunctionRule> consume_a_function(TokenStream<T>&);
struct GeneralEnclosed {
};
[[nodiscard]] Optional<GeneralEnclosed> parse_general_enclosed();
template<typename T>
[[nodiscard]] Optional<GeneralEnclosed> parse_general_enclosed(TokenStream<T>&);
[[nodiscard]] RefPtr<CSSRule> convert_to_rule(NonnullRefPtr<StyleRule>);
[[nodiscard]] RefPtr<PropertyOwningCSSStyleDeclaration> convert_to_declaration(NonnullRefPtr<StyleBlockRule>);
@ -234,6 +246,10 @@ private:
Optional<MediaQuery::MediaFeature> consume_media_feature(TokenStream<StyleComponentValueRule>&);
Optional<MediaQuery::MediaType> consume_media_type(TokenStream<StyleComponentValueRule>&);
OwnPtr<Supports::Condition> parse_supports_condition(TokenStream<StyleComponentValueRule>&);
Optional<Supports::InParens> parse_supports_in_parens(TokenStream<StyleComponentValueRule>&);
Optional<Supports::Feature> parse_supports_feature(TokenStream<StyleComponentValueRule>&);
static bool has_ignored_vendor_prefix(StringView const&);
ParsingContext m_context;
@ -254,6 +270,7 @@ Optional<CSS::SelectorList> parse_selector(CSS::ParsingContext const&, StringVie
RefPtr<CSS::CSSRule> parse_css_rule(CSS::ParsingContext const&, StringView);
RefPtr<CSS::MediaQuery> parse_media_query(CSS::ParsingContext const&, StringView const&);
NonnullRefPtrVector<CSS::MediaQuery> parse_media_query_list(CSS::ParsingContext const&, StringView const&);
RefPtr<CSS::Supports> parse_css_supports(CSS::ParsingContext const&, StringView const&);
RefPtr<CSS::StyleValue> parse_html_length(DOM::Document const&, StringView const&);