list.opa

/*
    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/>.
*/
Nil = {nil} : list

list =
  cons(e, l) = { hd = e; tl = l } : list
  empty = {nil} : list
  fold_left(f,accu,l) =
    rec aux(accu, l) =
          match l with
          | [] -> accu
          | [hd | tl] -> aux((f(accu, hd)), tl)
          end
    aux(accu,l)
  length(l) =
    rec aux(len, l) =
          match l with
          | [] -> len
          | [hd | tl] -> aux((len + 1), tl)
          end
    aux(0, l)
  map(f,l) =
    rec aux(l) =
          match l with
          | [] -> Nil
          | [hd | tl] -> cons((f(hd)), (aux(tl)))
          end
    aux(l)
  rec rev_append(l1, l2) =
        match l1 with
        | [] -> l2
        | [hd | tl] -> rev_append(tl, (cons(hd, l2)))
        end
  rec iter(f, l) =
        match l with
        | [] -> {} : {}
        | [hd | tl] ->
            match { _f0 = f(hd) } with
            | {_f0 = {}} -> iter(f, tl)
            end
        end
  sc = %%BslString.concat%% : string, string -> string
  rec ponctuate(s, f, l) =
        match l with
        | [] -> ""
        | [hd | tl] ->
            match tl with
            | [] -> f(hd)
            | [_ | _] -> sc((sc((f(hd)), s)), (ponctuate(s, f, tl)))
            end
        end
  formodule_cons = cons
  formodule_empty = empty
  formodule_fold_left = fold_left
  formodule_length = length
  formodule_map = map
  formodule_rev = l -> rev_append(l, Nil)
  formodule_ponctuate = ponctuate
  formodule_iter = iter
  {{
     cons = formodule_cons //used by test
  ; empty = formodule_empty //used by test
  ; fold_left = formodule_fold_left // used by magic
  ; length = formodule_length // used by test
  ; map = formodule_map //used by magic
  ; rev = formodule_rev // used by test
  ; ponctuate = formodule_ponctuate // used by test
  ; iter = formodule_iter //used by test
   }}