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LibWeb/DOM: Add ability to query Document for environment variables

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Currently this returns them in ComponentValue form, as that's what's
needed by env().
This commit is contained in:
Sam Atkins 2025-08-05 12:32:33 +01:00 • committed by Alexander Kalenik
commit 22e00451b9
Notes: github-actions[bot] 2025-08-07 14:41:50 +00:00
2 changed files with 46 additions and 0 deletions
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43
Libraries/LibWeb/DOM/Document.cpp
View file

@ -6597,6 +6597,49 @@ String Document::dump_display_list()
return display_list->dump();
}
Optional<Vector<CSS::Parser::ComponentValue>> Document::environment_variable_value(CSS::EnvironmentVariable environment_variable, Span<i64> indices) const
{
auto invalid = [] {
return Vector { CSS::Parser::ComponentValue { CSS::Parser::GuaranteedInvalidValue {} } };
};
switch (environment_variable) {
case CSS::EnvironmentVariable::PreferredTextScale:
// FIXME: Report the user's preferred text scale, once we have that as a setting.
if (!indices.is_empty())
return invalid();
return Vector {
CSS::Parser::ComponentValue {
CSS::Parser::Token::create_number(CSS::Number { CSS::Number::Type::Number, 1 }) }
};
case CSS::EnvironmentVariable::SafeAreaInsetBottom:
case CSS::EnvironmentVariable::SafeAreaInsetLeft:
case CSS::EnvironmentVariable::SafeAreaInsetRight:
case CSS::EnvironmentVariable::SafeAreaInsetTop:
case CSS::EnvironmentVariable::SafeAreaMaxInsetBottom:
case CSS::EnvironmentVariable::SafeAreaMaxInsetLeft:
case CSS::EnvironmentVariable::SafeAreaMaxInsetRight:
case CSS::EnvironmentVariable::SafeAreaMaxInsetTop:
// FIXME: Report the safe area, once we can detect our display's shape (and it's not rectangular).
if (!indices.is_empty())
return invalid();
return Vector {
CSS::Parser::ComponentValue { CSS::Parser::Token::create_dimension(0, "px"_fly_string) }
};
case CSS::EnvironmentVariable::ViewportSegmentBottom:
case CSS::EnvironmentVariable::ViewportSegmentHeight:
case CSS::EnvironmentVariable::ViewportSegmentLeft:
case CSS::EnvironmentVariable::ViewportSegmentRight:
case CSS::EnvironmentVariable::ViewportSegmentTop:
case CSS::EnvironmentVariable::ViewportSegmentWidth:
// "These variables are only defined when there are at least two such segments."
// https://drafts.csswg.org/css-env/#viewport-segments
// FIXME: Report the viewport segment areas, once we can detect that and there are multiple of them.
return Vector { CSS::Parser::ComponentValue { CSS::Parser::GuaranteedInvalidValue {} } };
}
VERIFY_NOT_REACHED();
}
HashMap<FlyString, GC::Ref<Web::CSS::CSSPropertyRule>>& Document::registered_custom_properties()
{
return m_registered_custom_properties;

3
Libraries/LibWeb/DOM/Document.h
View file

@ -23,6 +23,7 @@
#include <LibUnicode/Forward.h>
#include <LibWeb/CSS/CSSPropertyRule.h>
#include <LibWeb/CSS/CSSStyleSheet.h>
#include <LibWeb/CSS/EnvironmentVariable.h>
#include <LibWeb/CSS/StyleSheetList.h>
#include <LibWeb/Cookie/Cookie.h>
#include <LibWeb/DOM/ParentNode.h>
@ -909,6 +910,8 @@ public:
StyleInvalidator& style_invalidator() { return m_style_invalidator; }
Optional<Vector<CSS::Parser::ComponentValue>> environment_variable_value(CSS::EnvironmentVariable, Span<i64> indices = {}) const;
// https://www.w3.org/TR/css-properties-values-api-1/#dom-window-registeredpropertyset-slot
HashMap<FlyString, GC::Ref<Web::CSS::CSSPropertyRule>>& registered_custom_properties();