[PP-1] Enum cases stored in config

No idea how to solve the value retrieval from the backend (see the step where the test fails)

Related: #2951046: Allow parsing and writing PHP constants and enums in YAML files → .

I think we can achieve almost the same without adding new concepts:

enum Fruits: string {
  case APPLE = 'apple';
  case PINEAPPLE = 'pineapple';
  case PLUM = 'plum';
  public static function choices(): array {
      return array_map(fn ($case) => $case->value, static::cases());
  }
}

+

mymodule.settings:
  type: config_object
  mapping:
    fruit:
      type: string
      constraints:
        Choice:
          callback: '\F\Q\C\Fruits::choices'

Well, is doing the job, but you still need to handle scalars and do the conversion in your custom code. Actually, with the Choice constraint you can directly enumerate the cases in the schema and you’ll drop the enum. You’re back in pre-enum era.

The idea was to offer a nice way to work with enums in your code without the need to know about their scalar representation. Same as for constants

without the need to know about their scalar representation

But if in your code you use Fruits::PLUM->value, you still don't need to know about the scalar representation? 🤔

@Wim Leers,

Discussed in Slack with @alexpott to rescope this on top of #2951046: Allow parsing and writing PHP constants and enums in YAML files → to offer here the schema types and validation part. Postponing on #2951046: Allow parsing and writing PHP constants and enums in YAML files →

👍