75 lines
2.4 KiB
OCaml
75 lines
2.4 KiB
OCaml
(***********************************************************************)
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(* *)
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(* OCaml *)
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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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(* Character operations *)
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external code: char -> int = "%identity"
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external unsafe_chr: int -> char = "%identity"
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let chr n =
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if n < 0 || n > 255 then invalid_arg "Char.chr" else unsafe_chr n
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external string_create: int -> string = "caml_create_string"
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external string_unsafe_get : string -> int -> char = "%string_unsafe_get"
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external string_unsafe_set : string -> int -> char -> unit
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= "%string_unsafe_set"
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let escaped = function
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| '\'' -> "\\'"
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| '\\' -> "\\\\"
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| '\n' -> "\\n"
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| '\t' -> "\\t"
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| '\r' -> "\\r"
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| '\b' -> "\\b"
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| ' ' .. '~' as c ->
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let s = string_create 1 in
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string_unsafe_set s 0 c;
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s
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| c ->
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let n = code c in
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let s = string_create 4 in
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string_unsafe_set s 0 '\\';
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string_unsafe_set s 1 (unsafe_chr (48 + n / 100));
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string_unsafe_set s 2 (unsafe_chr (48 + (n / 10) mod 10));
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string_unsafe_set s 3 (unsafe_chr (48 + n mod 10));
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s
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let lowercase c =
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if (c >= 'A' && c <= 'Z')
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|| (c >= '\192' && c <= '\214')
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|| (c >= '\216' && c <= '\222')
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then unsafe_chr(code c + 32)
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else c
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let uppercase c =
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if (c >= 'a' && c <= 'z')
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|| (c >= '\224' && c <= '\246')
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|| (c >= '\248' && c <= '\254')
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then unsafe_chr(code c - 32)
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else c
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let lowercase_ascii c =
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if (c >= 'A' && c <= 'Z')
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then unsafe_chr(code c + 32)
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else c
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let uppercase_ascii c =
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if (c >= 'a' && c <= 'z')
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then unsafe_chr(code c - 32)
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else c
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type t = char
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let compare c1 c2 = code c1 - code c2
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let equal (c1: t) (c2: t) = compare c1 c2 = 0
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