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std.ml
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std.ml
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(*
* Std - Additional functions
* Copyright (C) 2003 Nicolas Cannasse and Markus Mottl
* Copyright (C) 2007 Zheng Li (extracts of SDFlow)
* Copyright (C) 2008 David Teller
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version,
* with the special exception on linking described in file LICENSE.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*)
let input_lines ch =
Enum.from (fun () ->
try input_line ch with End_of_file -> raise Enum.No_more_elements)
let input_chars ch =
Enum.from (fun () ->
try input_char ch with End_of_file -> raise Enum.No_more_elements)
type 'a _mut_list = {
hd : 'a;
mutable tl : 'a _mut_list;
}
let input_list ch =
let _empty = Obj.magic [] in
let rec loop dst =
let r = { hd = input_line ch; tl = _empty } in
dst.tl <- r;
loop r in
let r = { hd = Obj.magic(); tl = _empty } in
try loop r
with
End_of_file ->
Obj.magic r.tl
let buf_len = 8192
let input_all ic =
let rec loop acc total buf ofs =
let n = input ic buf ofs (buf_len - ofs) in
if n = 0 then
let res = String.create total in
let pos = total - ofs in
let _ = String.blit buf 0 res pos ofs in
let coll pos buf =
let new_pos = pos - buf_len in
String.blit buf 0 res new_pos buf_len;
new_pos in
let _ = List.fold_left coll pos acc in
res
else
let new_ofs = ofs + n in
let new_total = total + n in
if new_ofs = buf_len then
loop (buf :: acc) new_total (String.create buf_len) 0
else loop acc new_total buf new_ofs in
loop [] 0 (String.create buf_len) 0
let input_file ?(bin=false) fname =
let ch = (if bin then open_in_bin else open_in) fname in
let str = input_all ch in
close_in ch;
str
let output_file ~filename ~text =
let ch = open_out filename in
output_string ch text;
close_out ch
let print_bool = function
| true -> print_string "true"
| false -> print_string "false"
let prerr_bool = function
| true -> prerr_string "true"
| false -> prerr_string "false"
let string_of_char c = String.make 1 c
external identity : 'a -> 'a = "%identity"
let rec dump r =
if Obj.is_int r then
string_of_int (Obj.magic r : int)
else (* Block. *)
let rec get_fields acc = function
| 0 -> acc
| n -> let n = n-1 in get_fields (Obj.field r n :: acc) n
in
let rec is_list r =
if Obj.is_int r then
r = Obj.repr 0 (* [] *)
else
let s = Obj.size r and t = Obj.tag r in
t = 0 && s = 2 && is_list (Obj.field r 1) (* h :: t *)
in
let rec get_list r =
if Obj.is_int r then
[]
else
let h = Obj.field r 0 and t = get_list (Obj.field r 1) in
h :: t
in
let opaque name =
(* XXX In future, print the address of value 'r'. Not possible in
* pure OCaml at the moment.
*)
"<" ^ name ^ ">"
in
let s = Obj.size r and t = Obj.tag r in
(* From the tag, determine the type of block. *)
match t with
| _ when is_list r ->
let fields = get_list r in
"[" ^ String.concat "; " (List.map dump fields) ^ "]"
| 0 ->
let fields = get_fields [] s in
"(" ^ String.concat ", " (List.map dump fields) ^ ")"
| x when x = Obj.lazy_tag ->
(* Note that [lazy_tag .. forward_tag] are < no_scan_tag. Not
* clear if very large constructed values could have the same
* tag. XXX *)
opaque "lazy"
| x when x = Obj.closure_tag ->
opaque "closure"
| x when x = Obj.object_tag ->
let fields = get_fields [] s in
let clasz, id, slots =
match fields with
| h::h'::t -> h, h', t
| _ -> assert false
in
(* No information on decoding the class (first field). So just print
* out the ID and the slots. *)
"Object #" ^ dump id ^ " (" ^ String.concat ", " (List.map dump slots) ^ ")"
| x when x = Obj.infix_tag ->
opaque "infix"
| x when x = Obj.forward_tag ->
opaque "forward"
| x when x < Obj.no_scan_tag ->
let fields = get_fields [] s in
"Tag" ^ string_of_int t ^
" (" ^ String.concat ", " (List.map dump fields) ^ ")"
| x when x = Obj.string_tag ->
"\"" ^ String.escaped (Obj.magic r : string) ^ "\""
| x when x = Obj.double_tag ->
string_of_float (Obj.magic r : float)
| x when x = Obj.abstract_tag ->
opaque "abstract"
| x when x = Obj.custom_tag ->
opaque "custom"
| x when x = Obj.final_tag ->
opaque "final"
| _ ->
failwith ("Std.dump: impossible tag (" ^ string_of_int t ^ ")")
let dump v = dump (Obj.repr v)
let print v = print_endline (dump v)
let finally handler f x =
let r = (
try
f x
with
e -> handler(); raise e
) in
handler();
r
let __unique_counter = ref 0
let unique() =
incr __unique_counter;
!__unique_counter
type ('a, 'b) result =
| Ok of 'a
| Bad of 'b
(** {6 Operators}*)
let ( |> ) x f = f x
let ( <| ) f x = f x
let ( |- ) f g x = g (f x)
let ( -| ) f g x = f (g x)
let flip f x y = f y x
let ( *** ) f g = fun (x,y) -> (f x, g y)
let ( &&& ) f g = fun x -> (f x, g x)
let first f x = fst (f x)
let second f x = snd (f x)
let curry f x y = f (x,y)
let uncurry f (x,y) = f x y
let const x _ = x
let invisible_args = ref 1
(* the number or arguments to ignore at the beginning of Sys.argv,
usually because program-name is put in argv.(0) *)
let args () =
let e = BatArray.enum Sys.argv in
Enum.drop !invisible_args e;
e
let exe =
Array.get Sys.argv 0
let argv = Sys.argv