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LibWeb: Parse and resolve UnresolvedStyleValues

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If a property is custom or contains a `var()` reference, it cannot be
parsed into a proper StyleValue immediately, so we store it as an
UnresolvedStyleValue until the property is compute. Then, at compute
time, we resolve them by expanding out any `var()` references, and
parsing the result.

The implementation here is very naive, and involves copying the
UnresolvedStyleValue's tree of StyleComponentValueRules while copying
the contents of any `var()`s it finds along the way. This is quite an
expensive operation to do every time that the style is computed.
This commit is contained in:
Sam Atkins 2021-12-03 12:32:12 +00:00 • committed by Andreas Kling
parent 000fb5a70d
commit 23dc0dac88
6 changed files with 138 additions and 6 deletions
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4
Userland/Libraries/LibWeb/CSS/StyleComputer.h
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@ -9,6 +9,7 @@
#include <AK/NonnullRefPtrVector.h>
#include <AK/OwnPtr.h>
#include <LibWeb/CSS/CSSStyleDeclaration.h>
#include <LibWeb/CSS/Parser/StyleComponentValueRule.h>
#include <LibWeb/CSS/StyleProperties.h>
#include <LibWeb/Forward.h>
@ -60,6 +61,9 @@ private:
void compute_defaulted_property_value(StyleProperties&, DOM::Element const*, CSS::PropertyID) const;
RefPtr<StyleValue> resolve_unresolved_style_value(DOM::Element&, PropertyID, UnresolvedStyleValue const&) const;
bool expand_unresolved_values(DOM::Element&, Vector<StyleComponentValueRule> const& source, Vector<StyleComponentValueRule>& dest) const;
template<typename Callback>
void for_each_stylesheet(CascadeOrigin, Callback) const;