1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
|
(**************************************************************************)
(* *)
(* OCamlFormat *)
(* *)
(* Copyright (c) Facebook, Inc. and its affiliates. *)
(* *)
(* This source code is licensed under the MIT license found in *)
(* the LICENSE file in the root directory of this source tree. *)
(* *)
(**************************************************************************)
module type S = sig
(** Defines the blocking interface for reading and writing to Cohttp
streams *)
(** ['a t] represents a blocking monad state *)
type 'a t
val ( >>= ) : 'a t -> ('a -> 'b t) -> 'b t
(** [a >>= b] will pass the result of [a] to the [b] function. This is a
monadic [bind]. *)
val return : 'a -> 'a t
(** [return a] will construct a constant IO value. *)
(** [ic] represents an input channel *)
type ic
(** [oc] represents an output channel *)
type oc
val read : ic -> Csexp.t option t
val write : oc -> Csexp.t list -> unit t
(** A basic implementation of this module can be:
{[
module IO = struct
type 'a t = 'a
type ic = in_channel
type oc = out_channel
let ( >>= ) x f = f x
let return x = x
let read ic =
match Csexp.input ic with
| Ok x -> return (Some x)
| Error _ -> return None
let write oc lx =
List.iter (Csexp.to_channel oc) lx ;
Stdlib.flush oc ;
return ()
end
]} *)
end
|
