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LibWeb: Support top-level tree counting functions

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Adds support for `sibling-index()` and `sibling-count()` when parsing
`<number>` and `<integer>`. This is achieved by a new
`TreeCountingFunctionStyleValue` class which is converted within
`absolutized` to `NumberStyleValue` and `IntegerStyleValue` respectively

There are still a few kinks to work out in order to support these
everywhere, namely:
 - There are some `StyleValue`s which aren't absolutized (i.e. those
   which are stored within another `StyleValue` without an
   `absolutize()` method.
 - We don't have a way to represent this new `StyleValue` within
   `{Number,Integer}OrCalculated`. This would be fixed if we were to
   instead just use the `StyleValue` classes until style computation at
   which time they would be absolutized into their respective
   primitives (double, i64, etc) bypassing the need for *OrCalculated
   entirely.
This commit is contained in:
Callum Law 2025-10-01 20:02:33 +13:00 • committed by Tim Ledbetter
parent 9cd23e3ae5
commit 831e471444
Notes: github-actions[bot] 2025-10-20 15:13:44 +00:00
17 changed files with 184 additions and 32 deletions
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1
Libraries/LibWeb/CMakeLists.txt
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@ -275,6 +275,7 @@ set(SOURCES
CSS/StyleValues/TextUnderlinePositionStyleValue.cpp
CSS/StyleValues/TransformationStyleValue.cpp
CSS/StyleValues/TransitionStyleValue.cpp
CSS/StyleValues/TreeCountingFunctionStyleValue.cpp
CSS/StyleValues/UnicodeRangeStyleValue.cpp
CSS/StyleValues/UnresolvedStyleValue.cpp
CSS/Supports.cpp