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(*pp camlp4o *)
(* arch-tag: Stream parser-related utilities
Copyright (C) 2004 John Goerzen <jgoerzen@complete.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*)
open Composeoper;;
let rec of_channel_lines ifd =
match (try Some (input_line ifd) with End_of_file -> None) with
None -> [< >]
| Some line -> [< 'line; of_channel_lines ifd >];;
let of_channel_blocks ifd blocksize =
let buf = String.make blocksize '\000' in
let rec forceread bytestoread =
if bytestoread = 0 then 0 else begin
let len = input ifd buf (blocksize - bytestoread) bytestoread in
if len = 0 then len else len + forceread (bytestoread - len)
end
in
let rec worker () =
let len = forceread blocksize in
if len = 0 then [< >] else
[< '(String.sub buf 0 len); worker () >]
in
worker () ;;
let rec filter func = parser
[< 'x; xs >] -> if func x then [< 'x; filter func xs >] else
[< filter func xs >]
| [< >] -> [< >];;
let rec map func = parser
[< 'x; xs >] -> [< 'func x; map func xs >]
| [< >] -> [< >];;
let rec map_stream func = parser
[< 'x; xs >] -> [< func x; map_stream func xs >]
| [< >] -> [< >];;
let rec fold_left func firstval = parser
[< 'x; xs >] -> fold_left func (func firstval x) xs
| [< >] -> firstval;;
let rec to_list = parser
[< 'x; xs >] -> x :: to_list xs
| [< >] -> [];;
let rec take n s =
let p = parser [< 'x; xs >] -> [< 'x; take (n - 1) xs >] in
match n with
0 -> [< >]
| n -> if n < 1 then raise (Failure "take stream") else p s;;
let rec drop n s = match n with
0 -> ()
| n -> if n < 1 then raise (Failure "drop stream") else Stream.next s; drop (n-1) s;;
let output_lines ofd s =
Stream.iter (fun line -> output_string ofd line; output_char ofd '\n') s;;
let output_chars ofd s =
Stream.iter (fun c -> output_char ofd c) s;;
let rec optparse func accum args = match try Some (func args) with
Stream.Failure ->
None with
None -> (List.rev accum)
| Some x -> optparse func (x :: accum) args;;
let rec optparse_1 funchead functail accum args =
(* Note: :: appears to evaluate right side first! Use this let to force left
* side to go first instead. *)
let item1 = funchead args in
item1 :: optparse functail accum args;;
let optparse_1_folded func combinefunc startval args =
let result = optparse_1 func func [] args in
List.fold_left combinefunc startval result;;
let optparse_1_string func args =
optparse_1_folded func (^) "" args;;
|
