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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.
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

View file

@ -20,7 +20,8 @@ class StyleFunctionRule : public RefCounted<StyleFunctionRule> {
friend class Parser;
public:
StyleFunctionRule(String name);
explicit StyleFunctionRule(String name);
StyleFunctionRule(String name, Vector<StyleComponentValueRule>&& values);
~StyleFunctionRule();
String const& name() const { return m_name; }