ludic/docs/language/structure/kw-enum.md
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Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-08-29 17:53:22 +03:00

1.5 KiB

id name category kind tokens sig tip order
kw-enum enum structure keyword enum enum Name { A, B, C } A named set of integer constants — names for a magic-number space. 50

An enum gives names to a set of related integer values so a magic-number space — a menu selection, a game mode, a machine state — reads as names instead of bare literals. Variants number themselves from 0 in declaration order, and you access one as Name.Variant, which is a compile-time int usable anywhere an int is: in match patterns, comparisons, and assignments. Ludic has no distinct enum runtime type yet — an enum value lives in an ordinary int or var and is saved with it — so enum is best understood as a readable naming layer over int.

program BattleMenu {
  enum Action { Attack, Guard, Item, Flee }

  var current_action: int = Action.Attack

  handler ChooseAction phase Input {
    let pressed = Input.key()
    if pressed == 'a' { current_action = Action.Attack }
    if pressed == 'g' { current_action = Action.Guard }
    if pressed == 'f' { current_action = Action.Flee }
  }

  handler DrawWorld phase Render {
    Screen.clear(Color.MidnightBlue)
    match current_action {
      Action.Attack => Screen.draw_text(x: 8, y: 8, text: "ATTACK", color: Color.Crimson, scale: 2)
      Action.Guard  => Screen.draw_text(x: 8, y: 8, text: "GUARD", color: Color.White, scale: 2)
      _             => Screen.draw_text(x: 8, y: 8, text: "FLEE", color: Color.Gold, scale: 2)
    }
    Screen.show()
  }
}