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LibWeb: Parse and resolve UnresolvedStyleValues
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.
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6 changed files with 138 additions and 6 deletions
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@ -113,6 +113,8 @@ public:
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RefPtr<StyleValue> parse_as_css_value(PropertyID);
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static RefPtr<StyleValue> parse_css_value(Badge<StyleComputer>, ParsingContext const&, PropertyID, Vector<StyleComponentValueRule> const&);
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private:
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enum class ParsingResult {
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Done,
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