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|
(* Small things *)
let ord_couple (a, b) = if a < b then a, b else b, a
(* uniq_sorted : 'a list -> 'a list *)
let rec uniq_sorted = function
| [] -> []
| [a] -> [a]
| a::b::q when a = b -> uniq_sorted (b::q)
| a::r -> a::(uniq_sorted r)
(* list_fold_op : ('a -> 'a -> 'a) -> 'a list -> 'a *)
let rec list_fold_op op = function
| [] -> invalid_arg "list_fold_opt on empty list"
| [a] -> a
| x::q -> op x (list_fold_op op q)
(* Either type *)
type ('a, 'b) either =
| Left of 'a
| Right of 'b
(* 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))
let not_implemented e = error ("Not implemented: " ^ 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)
module SSet = Set.Make(String)
(* Fixpoint *)
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 f sep fmt l =
let rec aux = function
| [] -> ()
| [a] -> f fmt a
| a::b -> f fmt a; Format.fprintf fmt "%s@," sep; aux b
in
aux l
let uid =
let c = ref 0 in
fun () -> c := !c + 1; string_of_int !c
|
