221 lines
8.2 KiB
OCaml
221 lines
8.2 KiB
OCaml
(***********************************************************************)
|
|
(* *)
|
|
(* Objective Caml *)
|
|
(* *)
|
|
(* Xavier Leroy, projet Cristal, 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. *)
|
|
(* *)
|
|
(***********************************************************************)
|
|
|
|
(* $Id$ *)
|
|
|
|
external format_int: string -> int -> string = "format_int"
|
|
external format_int32: string -> int32 -> string = "int32_format"
|
|
external format_nativeint: string -> nativeint -> string = "nativeint_format"
|
|
external format_int64: string -> int64 -> string = "int64_format"
|
|
external format_float: string -> float -> string = "format_float"
|
|
|
|
let bad_format fmt pos =
|
|
invalid_arg
|
|
("printf: bad format " ^ String.sub fmt pos (String.length fmt - pos))
|
|
|
|
(* Format a string given a %s format, e.g. %40s or %-20s.
|
|
To do: ignore other flags (#, +, etc)? *)
|
|
|
|
let format_string format s =
|
|
let rec parse_format neg i =
|
|
if i >= String.length format then (0, neg) else
|
|
match String.unsafe_get format i with
|
|
| '1'..'9' ->
|
|
(int_of_string (String.sub format i (String.length format - i - 1)),
|
|
neg)
|
|
| '-' ->
|
|
parse_format true (succ i)
|
|
| _ ->
|
|
parse_format neg (succ i) in
|
|
let (p, neg) =
|
|
try parse_format false 1 with Failure _ -> bad_format format 0 in
|
|
if String.length s < p then begin
|
|
let res = String.make p ' ' in
|
|
if neg
|
|
then String.blit s 0 res 0 (String.length s)
|
|
else String.blit s 0 res (p - String.length s) (String.length s);
|
|
res
|
|
end else
|
|
s
|
|
|
|
(* Extract a %format from [fmt] between [start] and [stop] inclusive.
|
|
'*' in the format are replaced by integers taken from the [widths] list.
|
|
The function is somewhat optimized for the "no *" case. *)
|
|
|
|
let extract_format fmt start stop widths =
|
|
match widths with
|
|
| [] -> String.sub fmt start (stop - start + 1)
|
|
| _ ->
|
|
let b = Buffer.create (stop - start + 10) in
|
|
let rec fill_format i w =
|
|
if i > stop then Buffer.contents b else
|
|
match (String.unsafe_get fmt i, w) with
|
|
('*', h::t) ->
|
|
Buffer.add_string b (string_of_int h); fill_format (succ i) t
|
|
| ('*', []) ->
|
|
bad_format fmt start (* should not happen *)
|
|
| (c, _) ->
|
|
Buffer.add_char b c; fill_format (succ i) w
|
|
in fill_format start (List.rev widths)
|
|
|
|
(* Decode a %format and act on it.
|
|
[fmt] is the printf format style, and [pos] points to a [%] character.
|
|
After consuming the appropriate number of arguments and formatting
|
|
them, one of the three continuations is called:
|
|
[cont_s] for outputting a string (args: string, next pos)
|
|
[cont_a] for performing a %a action (args: fn, arg, next pos)
|
|
[cont_t] for performing a %t action (args: fn, next pos)
|
|
"next pos" is the position in [fmt] of the first character following
|
|
the %format in [fmt]. *)
|
|
|
|
(* Note: here, rather than test explicitly against [String.length fmt]
|
|
to detect the end of the format, we use [String.unsafe_get] and
|
|
rely on the fact that we'll get a "nul" character if we access
|
|
one past the end of the string. These "nul" characters are then
|
|
caught by the [_ -> bad_format] clauses below.
|
|
Don't do this at home, kids. *)
|
|
|
|
let scan_format fmt pos cont_s cont_a cont_t =
|
|
let rec scan_flags widths i =
|
|
match String.unsafe_get fmt i with
|
|
| '*' ->
|
|
Obj.magic(fun w -> scan_flags (w :: widths) (succ i))
|
|
| '0'..'9' | '.' | '#' | '-' | ' ' | '+' -> scan_flags widths (succ i)
|
|
| _ -> scan_conv widths i
|
|
and scan_conv widths i =
|
|
match String.unsafe_get fmt i with
|
|
| '%' ->
|
|
cont_s "%" (succ i)
|
|
| 's' | 'S' as conv ->
|
|
Obj.magic (fun (s: string) ->
|
|
let s = if conv = 's' then s else "\"" ^ String.escaped s ^ "\"" in
|
|
if i = succ pos (* optimize for common case %s *)
|
|
then cont_s s (succ i)
|
|
else cont_s (format_string (extract_format fmt pos i widths) s)
|
|
(succ i))
|
|
| 'c' | 'C' as conv ->
|
|
Obj.magic (fun (c: char) ->
|
|
if conv = 'c'
|
|
then cont_s (String.make 1 c) (succ i)
|
|
else cont_s ("'" ^ Char.escaped c ^ "'") (succ i))
|
|
| 'd' | 'i' | 'o' | 'x' | 'X' | 'u' ->
|
|
Obj.magic(fun (n: int) ->
|
|
cont_s (format_int (extract_format fmt pos i widths) n) (succ i))
|
|
| 'f' | 'e' | 'E' | 'g' | 'G' | 'F' as conv ->
|
|
Obj.magic(fun (f: float) ->
|
|
let s = format_float (extract_format fmt pos i widths) f in
|
|
cont_s (if conv = 'F' then valid_float_lexem s else s) (succ i))
|
|
| 'b' | 'B' ->
|
|
Obj.magic(fun (b: bool) ->
|
|
cont_s (string_of_bool b) (succ i))
|
|
| 'a' ->
|
|
Obj.magic (fun printer arg ->
|
|
cont_a printer arg (succ i))
|
|
| 't' ->
|
|
Obj.magic (fun printer ->
|
|
cont_t printer (succ i))
|
|
| 'l' ->
|
|
begin match String.unsafe_get fmt (succ i) with
|
|
| 'd' | 'i' | 'o' | 'x' | 'X' | 'u' ->
|
|
Obj.magic(fun (n: int32) ->
|
|
cont_s (format_int32 (extract_format fmt pos (succ i) widths) n)
|
|
(i + 2))
|
|
| _ ->
|
|
bad_format fmt pos
|
|
end
|
|
| 'n' ->
|
|
begin match String.unsafe_get fmt (succ i) with
|
|
| 'd' | 'i' | 'o' | 'x' | 'X' | 'u' ->
|
|
Obj.magic(fun (n: nativeint) ->
|
|
cont_s (format_nativeint
|
|
(extract_format fmt pos (succ i) widths)
|
|
n)
|
|
(i + 2))
|
|
| _ ->
|
|
bad_format fmt pos
|
|
end
|
|
| 'L' ->
|
|
begin match String.unsafe_get fmt (succ i) with
|
|
| 'd' | 'i' | 'o' | 'x' | 'X' | 'u' ->
|
|
Obj.magic(fun (n: int64) ->
|
|
cont_s (format_int64 (extract_format fmt pos (succ i) widths) n)
|
|
(i + 2))
|
|
| _ ->
|
|
bad_format fmt pos
|
|
end
|
|
| _ ->
|
|
bad_format fmt pos
|
|
in scan_flags [] (pos + 1)
|
|
|
|
(* Application to [fprintf], etc. See also [Format.*printf]. *)
|
|
|
|
let fprintf chan fmt =
|
|
let fmt = (Obj.magic fmt : string) in
|
|
let len = String.length fmt in
|
|
let rec doprn i =
|
|
if i >= len then Obj.magic () else
|
|
match String.unsafe_get fmt i with
|
|
| '%' -> scan_format fmt i cont_s cont_a cont_t
|
|
| c -> output_char chan c; doprn (succ i)
|
|
and cont_s s i =
|
|
output_string chan s; doprn i
|
|
and cont_a printer arg i =
|
|
printer chan arg; doprn i
|
|
and cont_t printer i =
|
|
printer chan; doprn i
|
|
in doprn 0
|
|
|
|
let printf fmt = fprintf stdout fmt
|
|
let eprintf fmt = fprintf stderr fmt
|
|
|
|
let kprintf kont fmt =
|
|
let fmt = (Obj.magic fmt : string) in
|
|
let len = String.length fmt in
|
|
let dest = Buffer.create (len + 16) in
|
|
let rec doprn i =
|
|
if i >= len then begin
|
|
let res = Buffer.contents dest in
|
|
Buffer.clear dest; (* just in case kprintf is partially applied *)
|
|
Obj.magic (kont res)
|
|
end else
|
|
match String.unsafe_get fmt i with
|
|
| '%' -> scan_format fmt i cont_s cont_a cont_t
|
|
| c -> Buffer.add_char dest c; doprn (succ i)
|
|
and cont_s s i =
|
|
Buffer.add_string dest s; doprn i
|
|
and cont_a printer arg i =
|
|
Buffer.add_string dest (printer () arg); doprn i
|
|
and cont_t printer i =
|
|
Buffer.add_string dest (printer ()); doprn i
|
|
in doprn 0
|
|
|
|
let sprintf fmt = kprintf (fun x -> x) fmt;;
|
|
|
|
let bprintf dest fmt =
|
|
let fmt = (Obj.magic fmt : string) in
|
|
let len = String.length fmt in
|
|
let rec doprn i =
|
|
if i >= len then Obj.magic () else
|
|
match String.unsafe_get fmt i with
|
|
| '%' -> scan_format fmt i cont_s cont_a cont_t
|
|
| c -> Buffer.add_char dest c; doprn (succ i)
|
|
and cont_s s i =
|
|
Buffer.add_string dest s; doprn i
|
|
and cont_a printer arg i =
|
|
printer dest arg; doprn i
|
|
and cont_t printer i =
|
|
printer dest; doprn i
|
|
in doprn 0
|
|
|
|
|