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LibWeb/CSS: Implement guaranteed-invalid value

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This is a special value produced when var/attr substitution fails, and
is also the initial value for custom properties.
This commit is contained in:
Sam Atkins 2025-03-12 15:29:12 +00:00
commit d1dadd43a1
Notes: github-actions[bot] 2025-05-14 10:48:18 +00:00
4 changed files with 46 additions and 0 deletions
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7
Libraries/LibWeb/CSS/CSSStyleValue.cpp
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@ -40,6 +40,7 @@
#include <LibWeb/CSS/StyleValues/GridTemplateAreaStyleValue.h>
#include <LibWeb/CSS/StyleValues/GridTrackPlacementStyleValue.h>
#include <LibWeb/CSS/StyleValues/GridTrackSizeListStyleValue.h>
#include <LibWeb/CSS/StyleValues/GuaranteedInvalidStyleValue.h>
#include <LibWeb/CSS/StyleValues/ImageStyleValue.h>
#include <LibWeb/CSS/StyleValues/IntegerStyleValue.h>
#include <LibWeb/CSS/StyleValues/LengthStyleValue.h>
@ -240,6 +241,12 @@ GridTrackSizeListStyleValue const& CSSStyleValue::as_grid_track_size_list() cons
return static_cast<GridTrackSizeListStyleValue const&>(*this);
}
GuaranteedInvalidStyleValue const& CSSStyleValue::as_guaranteed_invalid() const
{
VERIFY(is_guaranteed_invalid());
return static_cast<GuaranteedInvalidStyleValue const&>(*this);
}
CSSKeywordValue const& CSSStyleValue::as_keyword() const
{
VERIFY(is_keyword());

5
Libraries/LibWeb/CSS/CSSStyleValue.h
View file

@ -113,6 +113,7 @@ public:
GridTemplateArea,
GridTrackPlacement,
GridTrackSizeList,
GuaranteedInvalid,
Image,
Integer,
Keyword,
@ -258,6 +259,10 @@ public:
GridTrackSizeListStyleValue const& as_grid_track_size_list() const;
GridTrackSizeListStyleValue& as_grid_track_size_list() { return const_cast<GridTrackSizeListStyleValue&>(const_cast<CSSStyleValue const&>(*this).as_grid_track_size_list()); }
bool is_guaranteed_invalid() const { return type() == Type::GuaranteedInvalid; }
GuaranteedInvalidStyleValue const& as_guaranteed_invalid() const;
GuaranteedInvalidStyleValue& as_guaranteed_invalid() { return const_cast<GuaranteedInvalidStyleValue&>(const_cast<CSSStyleValue const&>(*this).as_guaranteed_invalid()); }
bool is_image() const { return type() == Type::Image; }
ImageStyleValue const& as_image() const;
ImageStyleValue& as_image() { return const_cast<ImageStyleValue&>(const_cast<CSSStyleValue const&>(*this).as_image()); }

33
Libraries/LibWeb/CSS/StyleValues/GuaranteedInvalidStyleValue.h Normal file
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@ -0,0 +1,33 @@
/*
* Copyright (c) 2025, Sam Atkins <sam@ladybird.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <LibWeb/CSS/CSSStyleValue.h>
namespace Web::CSS {
// https://drafts.csswg.org/css-variables/#guaranteed-invalid-value
class GuaranteedInvalidStyleValue final : public StyleValueWithDefaultOperators<GuaranteedInvalidStyleValue> {
public:
static ValueComparingNonnullRefPtr<GuaranteedInvalidStyleValue> create()
{
static ValueComparingNonnullRefPtr<GuaranteedInvalidStyleValue> instance = adopt_ref(*new (nothrow) GuaranteedInvalidStyleValue());
return instance;
}
virtual ~GuaranteedInvalidStyleValue() override = default;
virtual String to_string(SerializationMode) const override { return {}; }
bool properties_equal(GuaranteedInvalidStyleValue const&) const { return true; }
private:
GuaranteedInvalidStyleValue()
: StyleValueWithDefaultOperators(Type::GuaranteedInvalid)
{
}
};
}

1
Libraries/LibWeb/Forward.h
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@ -245,6 +245,7 @@ class GridTrackPlacement;
class GridTrackPlacementStyleValue;
class GridTrackSizeList;
class GridTrackSizeListStyleValue;
class GuaranteedInvalidStyleValue;
class ImageStyleValue;
class IntegerOrCalculated;
class IntegerStyleValue;