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|
(**************************************************************************)
(* *)
(* OCaml *)
(* *)
(* Jerome Vouillon, projet Cristal, INRIA Rocquencourt *)
(* OCaml port by John Malecki and Xavier Leroy *)
(* *)
(* Copyright 1996 Institut National de Recherche en Informatique et *)
(* en Automatique. *)
(* *)
(* All rights reserved. This file is distributed under the terms of *)
(* the GNU Lesser General Public License version 2.1, with the *)
(* special exception on linking described in the file LICENSE. *)
(* *)
(**************************************************************************)
(*********************** Basic functions and types *********************)
(*** Miscellaneous ***)
exception Out_of_range
let nothing _ = ()
(*** Operations on lists. ***)
(* Remove an element from a list *)
let except e l =
let rec except_e = function
[] -> []
| elem::l -> if e = elem then l else elem::except_e l
in except_e l
(* Position of an element in a list. Head of list has position 0. *)
let index a l =
let rec index_rec i = function
[] -> raise Not_found
| b::l -> if a = b then i else index_rec (i + 1) l
in index_rec 0 l
(* Return the `n' first elements of `l' *)
(* ### n l -> l' *)
let rec list_truncate =
fun
p0 p1 -> match (p0,p1) with (0, _) -> []
| (_, []) -> []
| (n, (a::l)) -> a::(list_truncate (n - 1) l)
(* Separate the `n' first elements of `l' and the others *)
(* ### n list -> (first, last) *)
let rec list_truncate2 =
fun
p0 p1 -> match (p0,p1) with (0, l) ->
([], l)
| (_, []) ->
([], [])
| (n, (a::l)) ->
let (first, last) = (list_truncate2 (n - 1) l) in
(a::first, last)
(* Replace x by y in list l *)
(* ### x y l -> l' *)
let list_replace x y =
let rec repl =
function
[] -> []
| a::l ->
if a == x then y::l
else a::(repl l)
in repl
(*** Operations on strings. ***)
(* Remove blanks (spaces and tabs) at beginning and end of a string. *)
let is_space = function
| ' ' | '\t' -> true | _ -> false
let string_trim s =
let l = String.length s and i = ref 0 in
while
!i < l && is_space (String.get s !i)
do
incr i
done;
let j = ref (l - 1) in
while
!j >= !i && is_space (String.get s !j)
do
decr j
done;
String.sub s !i (!j - !i + 1)
(* isprefix s1 s2 returns true if s1 is a prefix of s2. *)
let isprefix s1 s2 =
let l1 = String.length s1 and l2 = String.length s2 in
(l1 = l2 && s1 = s2) || (l1 < l2 && s1 = String.sub s2 0 l1)
(*** I/O channels ***)
type io_channel = {
io_in : in_channel;
io_out : out_channel;
io_fd : Unix.file_descr
}
let io_channel_of_descr fd = {
io_in = Unix.in_channel_of_descr fd;
io_out = Unix.out_channel_of_descr fd;
io_fd = fd
}
let close_io io_channel =
close_out_noerr io_channel.io_out;
close_in_noerr io_channel.io_in;
;;
let std_io = {
io_in = stdin;
io_out = stdout;
io_fd = Unix.stdin
}
|
