27 lines
765 B
OCaml
27 lines
765 B
OCaml
(* Character operations *)
|
|
|
|
external code: char -> int = "%identity"
|
|
external unsafe_chr: int -> char = "%identity"
|
|
|
|
let chr n =
|
|
if n < 0 or n > 255 then invalid_arg "Char.chr" else unsafe_chr n
|
|
|
|
external is_printable: char -> bool = "is_printable"
|
|
|
|
let escaped = function
|
|
'\'' -> "\\'"
|
|
| '\\' -> "\\\\"
|
|
| '\n' -> "\\n"
|
|
| '\t' -> "\\t"
|
|
| c -> if is_printable c then
|
|
String.make 1 c
|
|
else begin
|
|
let n = code c in
|
|
let s = String.create 4 in
|
|
String.unsafe_set s 0 '\\';
|
|
String.unsafe_set s 1 (unsafe_chr (48 + n / 100));
|
|
String.unsafe_set s 2 (unsafe_chr (48 + (n / 10) mod 10));
|
|
String.unsafe_set s 3 (unsafe_chr (48 + n mod 10));
|
|
s
|
|
end
|