ludic/docs/language/control/kw-machine.md

id	name	category	kind	tokens	sig	tip	order
kw-machine	machine	control	keyword	machine	machine store { state Name { … } }	An explicit state machine over an int var — dispatches on the store's value.	6

A machine turns an integer store into an explicit state machine, replacing brittle if phase == N chains. It reads the store — a named program-scope var is the modern choice — and dispatches to the matching state block; inside a state, become Name transitions to another state of the same machine. States number themselves by declaration order (the first is 0, the next 1, and so on), so you never write magic constants, though state Name = expr is accepted when a state needs a specific value. Because become compiles to a single store back into the var, the whole machine lowers to plain branches with no dispatch table. Place a machine inside a handler so it runs each frame.

program TurnOrder {
  enum Phase { KnightMenu, KnightResolve, EnemyTurn }
  var battle_phase: int = Phase.KnightMenu

  handler RunTurn phase Update {
    machine battle_phase {
      state KnightMenu {
        if Input.key() == ' ' { become KnightResolve }
      }
      state KnightResolve {
        become EnemyTurn
      }
      state EnemyTurn {
        become KnightMenu
      }
    }
  }

  handler DrawWorld phase Render {
    Screen.clear(Color.MidnightBlue)
    Screen.draw_number(x: 8, y: 8, value: battle_phase, color: Color.Gold, scale: 2)
    Screen.show()
  }
}