mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2025-10-30 21:01:00 +00:00
89b59cb5c3
Technically, env() should not be an ASF. (😱) This is why some tests
still fail - env() as specced is expected to have its syntax checked
fully at parse-time, whereas ASFs are not properly syntax-checked until
later. However, I think this approach was worth doing for a few reasons:
- env() behaves like an ASF otherwise. (It is replaced with a set of
arbitrary component-values that are not known until computed-value
time.)
- env() was defined before the ASF concept existed, so I strongly
suspect it will be updated in the future to match that definition,
with a couple of adjustments. (eg, env() is allowed in some extra
places compared to var() and attr().)
- This was much quicker and easier to implement (under 3 hours in total)
compared to the greater amount of work to implement a whole separate
system just for env().
- Most of these tests are marked tentative, and the spec definition of
env() is still somewhat in flux, so failing some is not a huge deal.
If in the future I turn out to be wrong on this, we can convert it to
its own special thing.
55 lines
1.7 KiB
C++
55 lines
1.7 KiB
C++
/*
|
|
* Copyright (c) 2025, Sam Atkins <sam@ladybird.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <LibWeb/CSS/Parser/Parser.h>
|
|
|
|
namespace Web::CSS::Parser {
|
|
|
|
// https://drafts.csswg.org/css-values-5/#substitution-context
|
|
struct SubstitutionContext {
|
|
enum class DependencyType : u8 {
|
|
Property,
|
|
Attribute,
|
|
Function,
|
|
};
|
|
DependencyType dependency_type;
|
|
String first;
|
|
Optional<String> second {};
|
|
|
|
bool is_cyclic { false };
|
|
|
|
bool operator==(SubstitutionContext const&) const;
|
|
String to_string() const;
|
|
};
|
|
|
|
class GuardedSubstitutionContexts {
|
|
public:
|
|
void guard(SubstitutionContext&);
|
|
void unguard(SubstitutionContext const&);
|
|
|
|
private:
|
|
Vector<SubstitutionContext&> m_contexts;
|
|
};
|
|
|
|
enum class ArbitrarySubstitutionFunction : u8 {
|
|
Attr,
|
|
Env,
|
|
Var,
|
|
};
|
|
[[nodiscard]] Optional<ArbitrarySubstitutionFunction> to_arbitrary_substitution_function(FlyString const& name);
|
|
|
|
bool contains_guaranteed_invalid_value(Vector<ComponentValue> const&);
|
|
|
|
[[nodiscard]] Vector<ComponentValue> substitute_arbitrary_substitution_functions(DOM::AbstractElement&, GuardedSubstitutionContexts&, Vector<ComponentValue> const&, Optional<SubstitutionContext> = {});
|
|
|
|
using ArbitrarySubstitutionFunctionArguments = Vector<Vector<ComponentValue>>;
|
|
[[nodiscard]] Optional<ArbitrarySubstitutionFunctionArguments> parse_according_to_argument_grammar(ArbitrarySubstitutionFunction, Vector<ComponentValue> const&);
|
|
|
|
[[nodiscard]] Vector<ComponentValue> replace_an_arbitrary_substitution_function(DOM::AbstractElement&, GuardedSubstitutionContexts&, ArbitrarySubstitutionFunction, ArbitrarySubstitutionFunctionArguments const&);
|
|
|
|
}
|