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|
(************************************************************************)
(* * The Coq Proof Assistant / The Coq Development Team *)
(* v * INRIA, CNRS and contributors - Copyright 1999-2018 *)
(* <O___,, * (see CREDITS file for the list of authors) *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(* * (see LICENSE file for the text of the license) *)
(************************************************************************)
(* Mapping under pairs *)
let on_fst f (a,b) = (f a,b)
let on_snd f (a,b) = (a,f b)
let map_pair f (a,b) = (f a,f b)
(* Mapping under pairs *)
let on_pi1 f (a,b,c) = (f a,b,c)
let on_pi2 f (a,b,c) = (a,f b,c)
let on_pi3 f (a,b,c) = (a,b,f c)
(* Projections from triplets *)
let pi1 (a,_,_) = a
let pi2 (_,a,_) = a
let pi3 (_,_,a) = a
(* Characters *)
let is_letter c = (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')
let is_digit c = (c >= '0' && c <= '9')
let is_ident_tail c =
is_letter c || is_digit c || c = '\'' || c = '_'
let is_blank = function
| ' ' | '\r' | '\t' | '\n' -> true
| _ -> false
module Empty =
struct
type t
let abort (x : t) = assert false
end
(* Strings *)
module String : CString.ExtS = CString
let subst_command_placeholder s t =
let buff = Buffer.create (String.length s + String.length t) in
let i = ref 0 in
while (!i < String.length s) do
if s.[!i] = '%' && !i+1 < String.length s && s.[!i+1] = 's'
then (Buffer.add_string buff t;incr i)
else Buffer.add_char buff s.[!i];
incr i
done;
Buffer.contents buff
(* Lists *)
module List : CList.ExtS = CList
let (@) = CList.append
(* Arrays *)
module Array : CArray.ExtS = CArray
(* Sets *)
module Set = CSet
(* Maps *)
module Map = CMap
(* Stacks *)
module Stack = CStack
(* Matrices *)
let matrix_transpose mat =
List.fold_right (List.map2 (fun p c -> p::c)) mat
(if List.is_empty mat then [] else List.map (fun _ -> []) (List.hd mat))
(* Functions *)
let identity x = x
(** Left-to-right function composition:
[f1 %> f2] is [fun x -> f2 (f1 x)].
[f1 %> f2 %> f3] is [fun x -> f3 (f2 (f1 x))].
[f1 %> f2 %> f3 %> f4] is [fun x -> f4 (f3 (f2 (f1 x)))]
etc.
*)
let (%>) f g x = g (f x)
let const x _ = x
let iterate =
let rec iterate_f f n x =
if n <= 0 then x else iterate_f f (pred n) (f x)
in
iterate_f
let repeat n f x =
let rec loop i = if i <> 0 then (f x; loop (i - 1)) in loop n
let app_opt f x =
match f with
| Some f -> f x
| None -> x
(* Stream *)
let stream_nth n st =
try List.nth (Stream.npeek (n+1) st) n
with Failure _ -> raise Stream.Failure
let stream_njunk n st =
repeat n Stream.junk st
(* Delayed computations *)
type 'a delayed = unit -> 'a
let delayed_force f = f ()
(* Misc *)
type ('a, 'b) union = ('a, 'b) CSig.union = Inl of 'a | Inr of 'b
type 'a until = 'a CSig.until = Stop of 'a | Cont of 'a
type ('a, 'b) eq = ('a, 'b) CSig.eq = Refl : ('a, 'a) eq
let sym : type a b. (a, b) eq -> (b, a) eq = fun Refl -> Refl
module Union =
struct
let map f g = function
| Inl a -> Inl (f a)
| Inr b -> Inr (g b)
(** Lifting equality onto union types. *)
let equal f g x y = match x, y with
| Inl x, Inl y -> f x y
| Inr x, Inr y -> g x y
| _, _ -> false
let fold_left f g a = function
| Inl y -> f a y
| Inr y -> g a y
end
let map_union = Union.map
type iexn = Exninfo.iexn
let iraise = Exninfo.iraise
let open_utf8_file_in fname =
let is_bom s =
Int.equal (Char.code (Bytes.get s 0)) 0xEF &&
Int.equal (Char.code (Bytes.get s 1)) 0xBB &&
Int.equal (Char.code (Bytes.get s 2)) 0xBF
in
let in_chan = open_in fname in
let s = Bytes.make 3 ' ' in
if input in_chan s 0 3 < 3 || not (is_bom s) then seek_in in_chan 0;
in_chan
(** A trick which can typically be used to store on the fly the
computation of values in the "when" clause of a "match" then
retrieve the evaluated result in the r.h.s of the clause *)
let set_temporary_memory () =
let a = ref None in
(fun x -> assert (!a = None); a := Some x; x),
(fun () -> match !a with Some x -> x | None -> assert false)
|
