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LibWeb: Generate IDL attributes for all supported CSS properties

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The CSSOM spec tells us to potentially add up to three different IDL
attributes to CSSStyleDeclaration for every CSS property we support:
- A camelCased attribute, where a dash indicates the next character
  should be uppercase
- A camelCased attribute for every -webkit- prefixed property, with the
  first letter always being lowercase
- A dashed-attribute for every property with a dash in it.

Additionally, every attribute must have the CEReactions and
LegacyNullToEmptyString extended attributes specified on it.

Since we specify every property we support with Properties.json, we can
use that file to generate the IDL file and it's implementation.

We import it from the Build directory with the help of multiple import
base paths. Then, we add it to CSSStyleDeclaration via the mixin
functionality and inheriting the generated class in
CSSStyleDeclaration.
This commit is contained in:
Luke Wilde 2024-11-14 16:57:14 +00:00 • committed by Andreas Kling
commit aacf9b08ed
Notes: github-actions[bot] 2024-11-14 18:51:20 +00:00
12 changed files with 909 additions and 60 deletions
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Documentation/CSSGeneratedFiles.md
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@ -11,7 +11,7 @@ They are run automatically as part of the build, and most of the time you can ig
## Properties.json
Each CSS property has an entry here, which describes what values it accepts, whether it's inherited, and similar data.
This generates `PropertyID.h` and `PropertyID.cpp`.
This generates `PropertyID.h`, `PropertyID.cpp`, `GeneratedCSSStyleProperties.h`, `GeneratedCSSStyleProperties.cpp` and `GeneratedCSSStyleProperties.idl`.
Most of this data is found in the information box for that property in the relevant CSS spec.
The file is organized as a single JSON object, with keys being property names, and the values being the data for that property.