let upward = [ `Stay ; `Parent ; `Previous_sibling ] in
let downward = [ `Stay; `First_child; `Next_sibling ] in
let swap dir = if dir == upward then downward else upward in
- let is_satisfied q t =
- Move.for_all (fun _ set -> StateSet.(is_empty (remove q set))) t
+ let is_satisfied dir q t =
+ Move.for_all (fun d set ->
+ if List.mem d dir then
+ StateSet.(is_empty (remove q set))
+ else StateSet.is_empty set) t
in
let update_dependencies dir initacc =
let rec loop acc =
Move.set deps m (StateSet.diff (Move.get deps m) to_remove)
)
dir;
- if is_satisfied q deps then StateSet.add q acc else acc
+ if is_satisfied dir q deps then StateSet.add q acc else acc
) dependencies acc
in
if acc == new_acc then new_acc else loop new_acc