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