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(*
Copyright © 2011 MLstate
This file is part of OPA.
OPA is free software: you can redistribute it and/or modify it under the
terms of the GNU Affero General Public License, version 3, as published by
the Free Software Foundation.
OPA 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 Affero General Public License for
more details.
You should have received a copy of the GNU Affero General Public License
along with OPA. If not, see <http://www.gnu.org/licenses/>.
*)
(* some syntactical loop functions
e.g.
fold(datastructure[,accumulator])(fun key [val,acc] ->
loop code
)
accumulator is always in last position in the argument function
key is always in the first position (index is considered as a key)
*)
module For =
struct
let range a b acc fct =
let rec aux i acc =
if i >= b then acc
else
let acc = fct i acc in
aux (succ i) acc
in
aux a acc
end
module Fold = struct
let list(l,acc)(f) = Base.List.foldl f l acc
let array(a,acc)(f) =
let len = Array.length a in
let rec aux f len i acc =
if i = len then acc
else aux f len (i+1) (f i (Array.unsafe_get a i) acc)
in
aux f len 0 acc
let rev_array(a,acc)(f) =
let len = Array.length a in
let rec aux f i acc =
if i = (-1) then acc
else aux f (i-1) (f i (Array.unsafe_get a i) acc)
in
aux f (len-1) acc
let option((o:'a option),(acc:'b))((f:'a->'b->'b)) = Option.fold (fun acc v->f v acc) acc o
end
module InitAcc = struct
(** init the list with [ fst( f i _) : i C {0..n-1} ] and return the folded accumulator *)
let list(n,acc)(f) =
let rec aux f i acc l =
if i<0 then l,acc
else let fi,acc = f i acc in
let i = i-1
and l = fi::l in
aux f i acc l
in aux f (n-1) acc []
end
module FilterMap = struct
(* warning : the filter function should be pure, it is called two times for each element *)
let array(a)(filter)(image) =
let nb = Fold.array(a,0)(fun i v nb-> if filter i v then nb+1 else nb) in
Fold.array(a,[||])(fun i v narray ->
if filter i v then (
let image = image i v in
if narray = [||] then Array.create nb image
else (narray.(i) <- image; narray)
) else narray)
end
module Map = struct
let list(l)(f) = Base.List.map f l
let array(l)(f) = Base.Array.mapi f l
let option(o)(f) = Option.map f o
end
module FoldMap = struct
(* rewrite because would by inefficient otherwise *)
let list(l,acc)(f) =
let rec aux f il ol acc =
match il with
| x::il ->
let x,acc = (f x acc) in
aux f il (x::ol) acc
| _ -> List.rev ol,acc
in aux f l [] acc
let array(array,accu)(f) =
let len = Array.length array in
if len = 0 then [||],accu else
let v0,accu = f 0 array.(0) accu in
let res = Array.create len v0 in
let rec aux i ecu =
if i = len then ecu
else
let v,accu = (f i array.(i) ecu) in
res.(i) <- v;
aux (i+1) accu
in
let accu = aux 1 accu in
res,accu
end
module Iter = struct
let list(l)(f) = Base.List.iter f l
let array(l)(f) = Base.Array.iteri f l
end
module Deprecated = struct
let l_fold = Fold.list
let l_map = Map.list
let l_filter(l)(f) = List.filter f l
let l_filter_map(l)(f) = Base.List.filter_map f l
let l_for_all(l)(f) = List.for_all f l
let l_map_flat(l) (f) = List.flatten (Base.List.map f l)
let l_map_sort(l) (f) = List.sort compare (Base.List.map f l)
let l_iter (l) (f) = List.iter f l
end
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