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open Lang
open Lang.F
type binding =
| Bind of var * var
| Join of var * var
type t = binding list
let empty = []
let is_empty n = n = []
let union = List.append
let bind ~fresh ~bound bs = Bind(fresh,bound) :: bs
let join x y bs =
if Var.equal x y then bs else Join(x,y) :: bs
let eq x y = F.p_equal (e_var x) (e_var y)
let rec collect phi hs = function
| [] -> hs
| Bind(x,y)::bs -> collect phi (if phi y then eq x y :: hs else hs) bs
| Join(x,y)::bs -> collect phi (if phi x || phi y then eq x y :: hs else hs) bs
let apply bindings p =
let xs = varsp p in
let hs = collect (fun x -> Vars.mem x xs) [] bindings in
p_conj (p::hs)
let conditions bindings phi = collect phi [] bindings
let iter = List.iter
let pretty fmt =
List.iter
begin function
| Bind(x,y) ->
Format.fprintf fmt "@ @[%a:=%a@]"
F.pp_var x F.pp_var y
| Join(x,y) ->
Format.fprintf fmt "@ @[%a==%a@]"
F.pp_var x F.pp_var y
end