heptagon/compiler/utilities/misc.ml

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(**************************************************************************)
(* *)
(* Heptagon *)
(* *)
(* Author : Marc Pouzet *)
(* Organization : Demons, LRI, University of Paris-Sud, Orsay *)
(* *)
(**************************************************************************)
(* useful stuff *)
let optional f = function
| None -> None
| Some x -> Some (f x)
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let optional_wacc f acc = function
| None -> None, acc
| Some x -> let x, acc = f acc x in Some x, acc
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let optunit f = function
| None -> ()
| Some x -> f x
(** [split_string s c] splits the string [s] in a list of sub-strings according
to separator [c]. *)
let rec split_string s c =
try
let id = String.index s c in
let rest = String.sub s (id + 1) (String.length s - id - 1) in
String.sub s 0 id :: split_string rest c
with Not_found -> [s]
(* creation of names. Ensure unicity for the whole compilation chain *)
let symbol = ref 0
let gen_symbol () = incr symbol; "_"^(string_of_int !symbol)
let reset_symbol () = symbol := (*!min_symbol*) 0
let unique l =
let tbl = Hashtbl.create (List.length l) in
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List.iter (fun i -> Hashtbl.replace tbl i ()) l;
Hashtbl.fold (fun key _ accu -> key :: accu) tbl []
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let rec incomplete_map f l =
match l with
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| [] -> []
| [a] -> [a]
| a::l -> (f a)::(incomplete_map f l)
let rec last_element l =
match l with
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| [] -> assert false
| [v] -> v
| _::l -> last_element l
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(** [split_last l] returns l without its last element and
the last element of l. *)
let rec split_last = function
| [] -> assert false
| [a] -> [], a
| v::l ->
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let l, a = split_last l in
v::l, a
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let remove x l =
List.filter (fun y -> x <> y) l
let list_compare c l1 l2 =
let rec aux l1 l2 = match (l1, l2) with
| (h1::t1, h2::t2) ->
let result = c h1 h2 in
if result = 0 then aux t1 t2 else result
| ([], [] ) -> 0
| (_, [] ) -> 1
| ([], _ ) -> -1
in aux l1 l2
let option_compare f ox1 ox2 = match ox1, ox2 with
| None, None -> 0
| Some x1, Some x2 -> f x1 x2
| None, _ -> -1
| _, None -> 1
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let is_empty = function
| [] -> true
| _ -> false
(** [repeat_list v n] returns a list with n times the value v. *)
let repeat_list v n =
let rec aux = function
| 0 -> []
| n -> v::(aux (n-1))
in
aux n
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(** Same as List.mem_assoc but using the value instead of the key. *)
let rec memd_assoc value = function
| [] -> false
| (_,d)::l -> (d = value) or (memd_assoc value l)
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(** Same as List.assoc but searching for a data and returning the key. *)
let rec assocd value = function
| [] -> raise Not_found
| (k,d)::l ->
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if d = value then
k
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else
assocd value l
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(** { 3 Compiler iterators } *)
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(** Mapfold *)
let mapfold f acc l =
let l,acc = List.fold_left
(fun (l,acc) e -> let e,acc = f acc e in e::l, acc)
([],acc) l in
List.rev l, acc
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let mapfold_right f l acc =
List.fold_right (fun e (acc, l) -> let acc, e = f e acc in (acc, e :: l))
l (acc, [])
let mapi f l =
let rec aux i = function
| [] -> []
| v::l -> (f i v)::(aux (i+1) l)
in
aux 0 l
let mapi2 f l1 l2 =
let rec aux i l1 l2 =
match l1, l2 with
| [], [] -> []
| [], _ -> invalid_arg ""
| _, [] -> invalid_arg ""
| v1::l1, v2::l2 -> (f i v1 v2)::(aux (i+1) l1 l2)
in
aux 0 l1 l2
let mapi3 f l1 l2 l3 =
let rec aux i l1 l2 l3 =
match l1, l2, l3 with
| [], [], [] -> []
| [], _, _ -> invalid_arg ""
| _, [], _ -> invalid_arg ""
| _, _, [] -> invalid_arg ""
| v1::l1, v2::l2, v3::l3 ->
(f i v1 v2 v3)::(aux (i+1) l1 l2 l3)
in
aux 0 l1 l2 l3
let fold_righti f l acc =
let rec aux i l acc = match l with
| [] -> acc
| h :: l -> f i h (aux (i + 1) l acc) in
aux 0 l acc
(* Functions to decompose a list into a tuple *)
let _arity_error i l =
Format.eprintf "Internal compiler error: \
wrong list size (found %d, expected %d).@." (List.length l) i;
assert false
let _arity_min_error i l =
Format.eprintf "Internal compiler error: \
wrong list size (found %d, expected %d at least).@." (List.length l) i;
assert false
let assert_empty = function
| [] -> ()
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| l -> _arity_error 0 l
let assert_1 = function
| [v] -> v
| l -> _arity_error 1 l
let assert_1min = function
| v::l -> v, l
| l -> _arity_min_error 1 l
let assert_2 = function
| [v1; v2] -> v1, v2
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| l -> _arity_error 2 l
let assert_2min = function
| v1::v2::l -> v1, v2, l
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| l -> _arity_min_error 2 l
let assert_3 = function
| [v1; v2; v3] -> v1, v2, v3
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| l -> _arity_error 3 l