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module T = Sounds
(** Transform the S into Z if the S is the opening consonant and
there is no ending consonant before *)
let process
: 'a Sig.modifier
= fun init ->
let (((v1, v2), c) , ending) = init in
match c with
| None -> init
| Some op ->
(* The voyel may be none in case of ending word. In such case, we shall
not transform the S into Z *)
let is_voyel = T.is_voyel v1 && T.is_voyel v2 in
match is_voyel, op.Sig.opening, op.Sig.ending with
| true, hd::[], None when hd = T.sz ->
let c = Some { op with opening = [T.z] } in
(((v1, v2), c) , ending)
| true, hd::n::[], None when hd = T.sz && T.is_voyel n->
(* The s is followed by a semi-voyel *)
let c = Some { op with opening = [T.z; n] } in
(((v1, v2), c) , ending)
| _ -> init
|