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LibWeb+CodeGenerators: Generate EnvironmentVariable enum and functions

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This commit is contained in:
Sam Atkins
2025-08-05 11:53:43 +01:00
committed by Alexander Kalenik
parent b03e829a49
commit 7b30c94fcf
Notes: github-actions[bot] 2025-08-07 14:41:56 +00:00 
Author: https://github.com/AtkinsSJ
Commit: https://github.com/LadybirdBrowser/ladybird/commit/7b30c94fcf7
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/5736
Reviewed-by: https://github.com/kalenikaliaksandr
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Documentation/CSSGeneratedFiles.md
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@@ -312,3 +312,24 @@ The generated code provides:
- `Optional<TransformFunction> transform_function_from_string(StringView)` to parse a string as a `TransformFunction`
- `StringView to_string(TransformFunction)` to convert a `TransformFunction` back to a string
- `TransformFunctionMetadata transform_function_metadata(TransformFunction)` to obtain metadata about the transform function, such as its parameter list
## EnvironmentVariables.json
This is a single JSON object, describing each [CSS environment variable](https://drafts.csswg.org/css-env/#css-environment-variable),
with the keys being the environment variable names, and the values being objects describing the variable's properties.
This generates `EnvironmentVariable.h` and `EnvironmentVariable.cpp`.
Each entry has 3 properties, all taken from the
| Field | Description |
|--------------|---------------------------------------------------------------------|
| `spec` | String. URL to the spec definition for this environment variable. |
| `type` | String. CSS value type of the variable, eg `<length>`. |
| `dimensions` | Integer. Number of dimensions for the variable, or `0` for scalars. |
The generated code provides:
- An `EnvironmentVariable` enum listing the environment variables
- `Optional<EnvironmentVariable> environment_variable_from_string(StringView)` to parse a string as an `EnvironmentVariable`
- `StringView to_string(EnvironmentVariable)` to convert the `EnvironmentVariable` back to a string
- `ValueType environment_variable_type(EnvironmentVariable)` to get the variable's value type
- `u32 environment_variable_dimension_count(EnvironmentVariable)` to get its dimension count