source: code/trunk/lib/id.ml@ 53

Last change on this file since 53 was 39, checked in by fox, 2 years ago

Read References field; referred by listing; test & tidy documentation

File size: 956 bytes
Line 
1let random_state = Random.State.make_self_init
2
3(*module UUID = struct*)
4(*type t = Uuidm.t*)
5(*let compare = Uuidm.compare*)
6(*let to_string = Uuidm.to_string*)
7(*let of_string = Uuidm.of_string*)
8(*let to_bytes = Uuidm.to_bytes*)
9(*let of_bytes = Uuidm.of_bytes*)
10(*let generate ?(random_state=random_state ()) = Uuidm.v4_gen random_state*)
11(*let nil = Uuidm.nil*)
12(*end*)
13
14type t = string
15let compare = String.compare
16let nil = ""
17
18let short ?(len) id =
19 let id_len = String.length id in
20 let l = match len with Some l -> l | None -> if id_len = 36 then 8 else 6 in
21 String.sub id 0 (min l id_len)
22
23let generate ?(len=6) ?(seed=random_state ()) () =
24 let b32 i = char_of_int @@
25 if i < 10 then i+48 else
26 if i < 18 then i+87 else
27 if i < 20 then i+88 else
28 if i < 22 then i+89 else
29 if i < 27 then i+90 else
30 if i < 32 then i+91 else
31 (invalid_arg ("id.char" ^ string_of_int i)) in
32 let c _ = b32 (Random.State.int seed 31) in
33 String.init len c
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