273 lines
9.0 KiB
OCaml
273 lines
9.0 KiB
OCaml
(***********************************************************************)
|
|
(* *)
|
|
(* OCaml *)
|
|
(* *)
|
|
(* Damien Doligez, projet Para, INRIA Rocquencourt *)
|
|
(* *)
|
|
(* Copyright 1996 Institut National de Recherche en Informatique et *)
|
|
(* en Automatique. All rights reserved. This file is distributed *)
|
|
(* under the terms of the GNU Library General Public License, with *)
|
|
(* the special exception on linking described in file ../LICENSE. *)
|
|
(* *)
|
|
(***********************************************************************)
|
|
|
|
type key = string
|
|
type doc = string
|
|
type usage_msg = string
|
|
type anon_fun = (string -> unit)
|
|
|
|
type spec =
|
|
| Unit of (unit -> unit) (* Call the function with unit argument *)
|
|
| Bool of (bool -> unit) (* Call the function with a bool argument *)
|
|
| Set of bool ref (* Set the reference to true *)
|
|
| Clear of bool ref (* Set the reference to false *)
|
|
| String of (string -> unit) (* Call the function with a string argument *)
|
|
| Set_string of string ref (* Set the reference to the string argument *)
|
|
| Int of (int -> unit) (* Call the function with an int argument *)
|
|
| Set_int of int ref (* Set the reference to the int argument *)
|
|
| Float of (float -> unit) (* Call the function with a float argument *)
|
|
| Set_float of float ref (* Set the reference to the float argument *)
|
|
| Tuple of spec list (* Take several arguments according to the
|
|
spec list *)
|
|
| Symbol of string list * (string -> unit)
|
|
(* Take one of the symbols as argument and
|
|
call the function with the symbol. *)
|
|
| Rest of (string -> unit) (* Stop interpreting keywords and call the
|
|
function with each remaining argument *)
|
|
|
|
exception Bad of string
|
|
exception Help of string
|
|
|
|
type error =
|
|
| Unknown of string
|
|
| Wrong of string * string * string (* option, actual, expected *)
|
|
| Missing of string
|
|
| Message of string
|
|
|
|
exception Stop of error;; (* used internally *)
|
|
|
|
open Printf
|
|
|
|
let rec assoc3 x l =
|
|
match l with
|
|
| [] -> raise Not_found
|
|
| (y1, y2, y3) :: t when y1 = x -> y2
|
|
| _ :: t -> assoc3 x t
|
|
;;
|
|
|
|
let make_symlist prefix sep suffix l =
|
|
match l with
|
|
| [] -> "<none>"
|
|
| h::t -> (List.fold_left (fun x y -> x ^ sep ^ y) (prefix ^ h) t) ^ suffix
|
|
;;
|
|
|
|
let print_spec buf (key, spec, doc) =
|
|
if String.length doc > 0 then
|
|
match spec with
|
|
| Symbol (l, _) ->
|
|
bprintf buf " %s %s%s\n" key (make_symlist "{" "|" "}" l) doc
|
|
| _ ->
|
|
bprintf buf " %s %s\n" key doc
|
|
;;
|
|
|
|
let help_action () = raise (Stop (Unknown "-help"));;
|
|
|
|
let add_help speclist =
|
|
let add1 =
|
|
try ignore (assoc3 "-help" speclist); []
|
|
with Not_found ->
|
|
["-help", Unit help_action, " Display this list of options"]
|
|
and add2 =
|
|
try ignore (assoc3 "--help" speclist); []
|
|
with Not_found ->
|
|
["--help", Unit help_action, " Display this list of options"]
|
|
in
|
|
speclist @ (add1 @ add2)
|
|
;;
|
|
|
|
let usage_b buf speclist errmsg =
|
|
bprintf buf "%s\n" errmsg;
|
|
List.iter (print_spec buf) (add_help speclist);
|
|
;;
|
|
|
|
let usage_string speclist errmsg =
|
|
let b = Buffer.create 200 in
|
|
usage_b b speclist errmsg;
|
|
Buffer.contents b;
|
|
;;
|
|
|
|
let usage speclist errmsg =
|
|
eprintf "%s" (usage_string speclist errmsg);
|
|
;;
|
|
|
|
let current = ref 0;;
|
|
|
|
let parse_argv_dynamic ?(current=current) argv speclist anonfun errmsg =
|
|
let l = Array.length argv in
|
|
let b = Buffer.create 200 in
|
|
let initpos = !current in
|
|
let stop error =
|
|
let progname = if initpos < l then argv.(initpos) else "(?)" in
|
|
begin match error with
|
|
| Unknown "-help" -> ()
|
|
| Unknown "--help" -> ()
|
|
| Unknown s ->
|
|
bprintf b "%s: unknown option `%s'.\n" progname s
|
|
| Missing s ->
|
|
bprintf b "%s: option `%s' needs an argument.\n" progname s
|
|
| Wrong (opt, arg, expected) ->
|
|
bprintf b "%s: wrong argument `%s'; option `%s' expects %s.\n"
|
|
progname arg opt expected
|
|
| Message s ->
|
|
bprintf b "%s: %s.\n" progname s
|
|
end;
|
|
usage_b b !speclist errmsg;
|
|
if error = Unknown "-help" || error = Unknown "--help"
|
|
then raise (Help (Buffer.contents b))
|
|
else raise (Bad (Buffer.contents b))
|
|
in
|
|
incr current;
|
|
while !current < l do
|
|
let s = argv.(!current) in
|
|
if String.length s >= 1 && String.get s 0 = '-' then begin
|
|
let action =
|
|
try assoc3 s !speclist
|
|
with Not_found -> stop (Unknown s)
|
|
in
|
|
begin try
|
|
let rec treat_action = function
|
|
| Unit f -> f ();
|
|
| Bool f when !current + 1 < l ->
|
|
let arg = argv.(!current + 1) in
|
|
begin try f (bool_of_string arg)
|
|
with Invalid_argument "bool_of_string" ->
|
|
raise (Stop (Wrong (s, arg, "a boolean")))
|
|
end;
|
|
incr current;
|
|
| Set r -> r := true;
|
|
| Clear r -> r := false;
|
|
| String f when !current + 1 < l ->
|
|
f argv.(!current + 1);
|
|
incr current;
|
|
| Symbol (symb, f) when !current + 1 < l ->
|
|
let arg = argv.(!current + 1) in
|
|
if List.mem arg symb then begin
|
|
f argv.(!current + 1);
|
|
incr current;
|
|
end else begin
|
|
raise (Stop (Wrong (s, arg, "one of: "
|
|
^ (make_symlist "" " " "" symb))))
|
|
end
|
|
| Set_string r when !current + 1 < l ->
|
|
r := argv.(!current + 1);
|
|
incr current;
|
|
| Int f when !current + 1 < l ->
|
|
let arg = argv.(!current + 1) in
|
|
begin try f (int_of_string arg)
|
|
with Failure "int_of_string" ->
|
|
raise (Stop (Wrong (s, arg, "an integer")))
|
|
end;
|
|
incr current;
|
|
| Set_int r when !current + 1 < l ->
|
|
let arg = argv.(!current + 1) in
|
|
begin try r := (int_of_string arg)
|
|
with Failure "int_of_string" ->
|
|
raise (Stop (Wrong (s, arg, "an integer")))
|
|
end;
|
|
incr current;
|
|
| Float f when !current + 1 < l ->
|
|
let arg = argv.(!current + 1) in
|
|
begin try f (float_of_string arg);
|
|
with Failure "float_of_string" ->
|
|
raise (Stop (Wrong (s, arg, "a float")))
|
|
end;
|
|
incr current;
|
|
| Set_float r when !current + 1 < l ->
|
|
let arg = argv.(!current + 1) in
|
|
begin try r := (float_of_string arg);
|
|
with Failure "float_of_string" ->
|
|
raise (Stop (Wrong (s, arg, "a float")))
|
|
end;
|
|
incr current;
|
|
| Tuple specs ->
|
|
List.iter treat_action specs;
|
|
| Rest f ->
|
|
while !current < l - 1 do
|
|
f argv.(!current + 1);
|
|
incr current;
|
|
done;
|
|
| _ -> raise (Stop (Missing s))
|
|
in
|
|
treat_action action
|
|
with Bad m -> stop (Message m);
|
|
| Stop e -> stop e;
|
|
end;
|
|
incr current;
|
|
end else begin
|
|
(try anonfun s with Bad m -> stop (Message m));
|
|
incr current;
|
|
end;
|
|
done;
|
|
;;
|
|
|
|
let parse_argv ?(current=current) argv speclist anonfun errmsg =
|
|
parse_argv_dynamic ~current:current argv (ref speclist) anonfun errmsg;
|
|
;;
|
|
|
|
let parse l f msg =
|
|
try
|
|
parse_argv Sys.argv l f msg;
|
|
with
|
|
| Bad msg -> eprintf "%s" msg; exit 2;
|
|
| Help msg -> printf "%s" msg; exit 0;
|
|
;;
|
|
|
|
let parse_dynamic l f msg =
|
|
try
|
|
parse_argv_dynamic Sys.argv l f msg;
|
|
with
|
|
| Bad msg -> eprintf "%s" msg; exit 2;
|
|
| Help msg -> printf "%s" msg; exit 0;
|
|
;;
|
|
|
|
let second_word s =
|
|
let len = String.length s in
|
|
let rec loop n =
|
|
if n >= len then len
|
|
else if s.[n] = ' ' then loop (n+1)
|
|
else n
|
|
in
|
|
try loop (String.index s ' ')
|
|
with Not_found -> len
|
|
;;
|
|
|
|
let max_arg_len cur (kwd, spec, doc) =
|
|
match spec with
|
|
| Symbol _ -> max cur (String.length kwd)
|
|
| _ -> max cur (String.length kwd + second_word doc)
|
|
;;
|
|
|
|
let add_padding len ksd =
|
|
match ksd with
|
|
| (_, _, "") ->
|
|
(* Do not pad undocumented options, so that they still don't show up when
|
|
* run through [usage] or [parse]. *)
|
|
ksd
|
|
| (kwd, (Symbol (l, _) as spec), msg) ->
|
|
let cutcol = second_word msg in
|
|
let spaces = String.make (len - cutcol + 3) ' ' in
|
|
(kwd, spec, "\n" ^ spaces ^ msg)
|
|
| (kwd, spec, msg) ->
|
|
let cutcol = second_word msg in
|
|
let spaces = String.make (len - String.length kwd - cutcol) ' ' in
|
|
let prefix = String.sub msg 0 cutcol in
|
|
let suffix = String.sub msg cutcol (String.length msg - cutcol) in
|
|
(kwd, spec, prefix ^ spaces ^ suffix)
|
|
;;
|
|
|
|
let align speclist =
|
|
let completed = add_help speclist in
|
|
let len = List.fold_left max_arg_len 0 completed in
|
|
List.map (add_padding len) completed
|
|
;;
|