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