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LibWeb/CSS: Add ability to reify a StyleValue

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When no better reification form is available, we produce an opaque
CSSStyleValue with a serialized value. For starters, this will be the
only way to reify, and then we'll add others later.
This commit is contained in:
Sam Atkins 2025-08-13 14:46:21 +01:00
parent b80930ae34
commit 276540fbe9
4 changed files with 13 additions and 4 deletions
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4
Libraries/LibWeb/CSS/CSSStyleValue.cpp
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@ -13,12 +13,12 @@ namespace Web::CSS {
GC_DEFINE_ALLOCATOR(CSSStyleValue);
GC::Ref<CSSStyleValue> CSSStyleValue::create(JS::Realm& realm, Optional<String> associated_property, Optional<String> constructed_from_string)
GC::Ref<CSSStyleValue> CSSStyleValue::create(JS::Realm& realm, String associated_property, String constructed_from_string)
{
return realm.create<CSSStyleValue>(realm, move(associated_property), move(constructed_from_string));
}
CSSStyleValue::CSSStyleValue(JS::Realm& realm, Optional<String> associated_property, Optional<String> constructed_from_string)
CSSStyleValue::CSSStyleValue(JS::Realm& realm, String associated_property, String constructed_from_string)
: PlatformObject(realm)
, m_associated_property(move(associated_property))
, m_constructed_from_string(move(constructed_from_string))

4
Libraries/LibWeb/CSS/CSSStyleValue.h
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@ -16,14 +16,14 @@ class CSSStyleValue : public Bindings::PlatformObject {
GC_DECLARE_ALLOCATOR(CSSStyleValue);
public:
[[nodiscard]] static GC::Ref<CSSStyleValue> create(JS::Realm&, Optional<String> associated_property = {}, Optional<String> constructed_from_string = {});
[[nodiscard]] static GC::Ref<CSSStyleValue> create(JS::Realm&, String associated_property, String constructed_from_string);
virtual ~CSSStyleValue() override = default;
virtual String to_string() const;
private:
explicit CSSStyleValue(JS::Realm&, Optional<String> associated_property = {}, Optional<String> constructed_from_string = {});
explicit CSSStyleValue(JS::Realm&, String associated_property, String constructed_from_string);
virtual void initialize(JS::Realm&) override;

8
Libraries/LibWeb/CSS/StyleValues/StyleValue.cpp
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@ -10,6 +10,7 @@
#include <LibGfx/Font/Font.h>
#include <LibGfx/Font/FontStyleMapping.h>
#include <LibGfx/Font/FontWeight.h>
#include <LibWeb/CSS/CSSStyleValue.h>
#include <LibWeb/CSS/Parser/Parser.h>
#include <LibWeb/CSS/StyleValues/AbstractImageStyleValue.h>
#include <LibWeb/CSS/StyleValues/AnchorSizeStyleValue.h>
@ -142,6 +143,13 @@ Vector<Parser::ComponentValue> StyleValue::tokenize() const
return Parser::Parser::create(Parser::ParsingParams {}, to_string(SerializationMode::Normal)).parse_as_list_of_component_values();
}
// https://drafts.css-houdini.org/css-typed-om-1/#reify-as-a-cssstylevalue
GC::Ref<CSSStyleValue> StyleValue::reify(JS::Realm& realm, String const& associated_property) const
{
// 1. Return a new CSSStyleValue object representing value whose [[associatedProperty]] internal slot is set to property.
return CSSStyleValue::create(realm, associated_property, to_string(SerializationMode::Normal));
}
int StyleValue::to_font_weight() const
{
if (is_keyword()) {

1
Libraries/LibWeb/CSS/StyleValues/StyleValue.h
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@ -207,6 +207,7 @@ public:
virtual String to_string(SerializationMode) const = 0;
virtual Vector<Parser::ComponentValue> tokenize() const;
virtual GC::Ref<CSSStyleValue> reify(JS::Realm&, String const& associated_property) const;
[[nodiscard]] int to_font_weight() const;
[[nodiscard]] int to_font_slope() const;