/usr/lib/ocaml/oasis/OASISGraph.ml is in liboasis-ocaml-dev 0.4.5-1build3.
This file is owned by root:root, with mode 0o644.
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(* OASIS: architecture for building OCaml libraries and applications *)
(* *)
(* Copyright (C) 2011-2013, Sylvain Le Gall *)
(* Copyright (C) 2008-2011, OCamlCore SARL *)
(* *)
(* This library is free software; you can redistribute it and/or modify it *)
(* under the terms of the GNU Lesser General Public License as published by *)
(* the Free Software Foundation; either version 2.1 of the License, or (at *)
(* your option) any later version, with the OCaml static compilation *)
(* exception. *)
(* *)
(* This library 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 file COPYING for more *)
(* details. *)
(* *)
(* You should have received a copy of the GNU Lesser General Public License *)
(* along with this library; if not, write to the Free Software Foundation, *)
(* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA *)
(******************************************************************************)
type vertex = int
module SetInt =
Set.Make
(struct
type t = int
let compare = ( - )
end)
type 'a t =
{
mutable vertexes: ('a * SetInt.t ref) array;
values: ('a, int) Hashtbl.t;
}
let create len =
{
vertexes = [||];
values = Hashtbl.create len;
}
let copy t =
{
vertexes = Array.copy t.vertexes;
values = Hashtbl.copy t.values;
}
let value_of_vertex t v =
if 0 <= v && v < Array.length t.vertexes then
fst (Array.unsafe_get t.vertexes v)
else
invalid_arg "get_vertex"
let vertex_of_value t e =
Hashtbl.find t.values e
let add_vertex t e =
if Hashtbl.mem t.values e then
Hashtbl.find t.values e
else
begin
let v = Array.length t.vertexes in
let nvertexes =
Array.init
(v + 1)
(fun i ->
if i = v then
e, ref SetInt.empty
else
t.vertexes.(i))
in
t.vertexes <- nvertexes;
Hashtbl.add t.values e v;
v
end
let add_edge t v1 v2 =
let size = Array.length t.vertexes in
if 0 <= v1 && v1 < size &&
0 <= v2 && v2 < size then
begin
let _, edges = t.vertexes.(v1) in
edges := SetInt.add v2 !edges
end
else
invalid_arg "add_edge"
let topological_sort t =
let size = Array.length t.vertexes in
(* Empty list that will contain the sorted vertexes *)
let l = ref [] in
(* Visited vertexes *)
let visited = Array.make size false in
let reverted_edges =
let arr = Array.make size [] in
for v1 = 0 to size - 1 do
SetInt.iter
(fun v2 -> arr.(v2) <- v1 :: arr.(v2))
!(snd t.vertexes.(v1))
done;
arr
in
let rec visit v =
if not visited.(v) then
begin
visited.(v) <- true;
List.iter visit reverted_edges.(v);
l := v :: !l
end
in
(* Go through all vertexes with no outgoing edges *)
for v = 0 to size - 1 do
visit v
done;
!l
let fold_edges f t acc =
let racc = ref acc in
for v1 = 0 to Array.length t.vertexes - 1 do
SetInt.iter
(fun v2 -> racc := f v1 v2 !racc)
!(snd t.vertexes.(v1))
done;
!racc
let transitive_closure t =
let size = Array.length t.vertexes in
let visited = Array.make size false in
let rec visit set v =
if not visited.(v) then begin
let () = visited.(v) <- true in
(* The set of outgoing edges is not complete *)
let current_set = snd t.vertexes.(v) in
let set' =
SetInt.fold
(fun v set' -> visit set' v)
!current_set !current_set
in
current_set := set';
SetInt.union set set'
end else begin
(* The set is complete *)
SetInt.union set !(snd t.vertexes.(v))
end
in
for v = 0 to size - 1 do
let _set: SetInt.t = visit SetInt.empty v in
()
done
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