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(* Locations *)
type position = Lexing.position
let position_unknown = Lexing.dummy_pos
type extent = position * position
let extent_unknown = (position_unknown, position_unknown)
(* Exceptions *)
exception NoLocError of string
let error x = raise (NoLocError x)
exception LocError of extent list * string
let loc_error l f x =
try f x with
| NoLocError e -> raise (LocError([l], e))
| LocError(q, e) -> raise (LocError(l::q, e))
(* Varmaps *)
module VarMap = Mapext.Make(String)
let disjoint_union k a b = match a, b with
| Some x, None -> Some x
| None, Some y -> Some y
| _ -> error ("Duplicate name in disjoint union: " ^ k)
let rec fix equal f s =
let fs = f s in
if equal fs s
then fs
else fix equal f fs
let (@@) f x = f x
let print_list x l =
Format.printf "%s: " x;
let rec aux = function
| [] -> ()
| [a] -> Format.printf "%s" a
| p::q -> Format.printf "%s, " p; aux q
in
Format.printf "["; aux l; Format.printf "]@."
let uid =
let c = ref 0 in
fun () -> c := !c + 1; string_of_int !c
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