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(***********************************************************************)
(* ocamldsort *)
(* *)
(* Copyright (C) 2002 Dimitri Ara *)
(* *)
(* 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. *)
(***********************************************************************)
exception Unmet_dependency of Files.file_type
exception Cyclic_dependency of Files.file_type list
exception Unknown_error
let find_local_cycle seen (target, deps) =
let rec check_dep aux = function
| (dep, hd :: tl) ->
if dep = hd then
List.rev (hd :: aux)
else
check_dep (hd :: aux) (dep, tl)
| (dep, []) -> [] in
let rec check_all_deps = function
| hd :: tl ->
begin match check_dep [] (hd, seen) with
| [] -> check_all_deps tl
| end_of_cycle ->
hd :: target :: end_of_cycle
end
| [] -> [] in
check_all_deps deps
let find_cycle all_dependencies =
let make_full_dependency dep =
try
List.find (fun (tar,_) -> tar = dep) all_dependencies
with Not_found -> raise (Unmet_dependency dep) in
let rec check_deps seen = function
| hd :: tl ->
begin match check_dependency seen hd with
| [] -> check_deps seen tl
| cycle -> cycle
end
| [] -> []
and check_dependency seen (target, deps) =
match find_local_cycle seen (target, deps) with
| [] ->
check_deps (target :: seen)
(List.map make_full_dependency deps)
| cycle -> cycle in
List.rev (check_deps [] all_dependencies)
let raise_error deps =
match find_cycle deps with
| [] -> raise Unknown_error
| cycle -> raise (Cyclic_dependency cycle)
let string_of_cycle cycle =
let buf = Buffer.create 64 in
let cycle = List.map Files.source_filename_of_file cycle in
let rec buffer_of_cycle cycle =
match cycle with
| [dep] ->
Printf.bprintf buf "%s" dep;
buffer_of_cycle []
| dep :: rest ->
Printf.bprintf buf "%s -> " dep;
buffer_of_cycle rest
| [] -> buf in
Buffer.contents (buffer_of_cycle cycle)
|
