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(* arch-tag: Hash table utilities implementation
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 Hashtbl;;
open Hashtbloper;;
open Composeoper;;
let merge original newitems =
let mergef = replace original in
iter mergef newitems;;
let map f hash = Hashtbl.fold (fun key value l -> (f key value) :: l) hash [];;
let keys hash = map (fun key value -> key) hash;;
let values hash = map (fun key value -> value) hash;;
let items hash = map (fun key value -> key, value) hash;;
let length hash = (keys %% List.length) hash;;
let convkeys hasht convfunc =
let doconv key value =
let newkey = convfunc key in
if newkey != key then
remove hasht key;
replace hasht newkey value in
iter doconv hasht;;
let convkeys_copy hasht convfunc =
let newhash = copy hasht in
convkeys newhash convfunc;
newhash;;
let str_of_stritem key value =
Printf.sprintf "%S,%S\n" key value;;
let stritem_of_str instr =
Scanf.sscanf instr "%S,%S" (fun k v -> k,v);;
let strhash_to_ochan hasht ochan =
Hashtbl.iter (fun k v -> output_string ochan (str_of_stritem k v)) hasht;;
let ichan_to_strhash ichan =
let hasht = create 5 in
let s = Streamutil.of_channel_lines ichan in
Stream.iter (fun line -> let v = stritem_of_str line in
add hasht (fst v) (snd v)) s;
hasht;;
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