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|
type position_type =
[ `Above
| `Below ]
(** Consonant category *)
type category =
| I
| II
| III
type 'a voyel =
{ opened : bool
; position : position_type
; app : ('a -> string) }
type 'a consonant =
{ position : 'a
; muted: string option
; repr : string
; primary : bool
; category : category }
type 'a glyph =
{ tengwa : 'a consonant option
(* The eventual Tehta above the tengwa *)
; tehta_above : 'a voyel option
(* And below *)
; tehta_below : 'a voyel option
}
let empty_glyph =
{ tengwa = None
; tehta_above = None
; tehta_below = None }
let pair
: 'a voyel -> 'a consonant -> string
= fun voyel consonant ->
voyel.app consonant.position
let repr_glyph
: portant:'a consonant -> 'a glyph -> Buffer.t -> unit
= fun ~portant { tengwa; tehta_above; tehta_below } b ->
let () = match tengwa with
| None -> Buffer.add_string b @@ portant.repr
| Some c ->Buffer.add_string b @@ c.repr in
let () = match tehta_above, tengwa with
| None, _ -> ()
| Some v, Some c -> Buffer.add_string b @@ pair v c
| Some v, None -> Buffer.add_string b @@ pair v portant in
let () = match tehta_below, tengwa with
| None, _ -> ()
| Some v, Some c -> Buffer.add_string b @@ pair v c
| Some v, None -> Buffer.add_string b @@ pair v portant in
()
let combine_glyph
: 'a glyph -> 'a glyph -> 'a glyph option
= fun g1 g2 ->
let tengwa = match g1.tengwa, g2.tengwa with
| Some _, Some _ -> Error ()
| None, any -> Ok (any)
| any, None -> Ok (any) in
let above = match g1.tehta_above, g2.tehta_above with
| Some _, Some _ -> Error ()
| None, any -> Ok any
| any, None -> Ok any in
let below = match g1.tehta_below, g2.tehta_below with
| Some _, Some _ -> Error ()
| None, any -> Ok any
| any, None -> Ok any in
(* Combine only if everything is ok *)
match tengwa, above, below with
| Ok tengwa, Ok tehta_above, Ok tehta_below ->
Some { tengwa; tehta_above; tehta_below}
| _, _, _ -> None
let add_voyel_to_glyph
: 'a glyph -> 'a voyel -> 'a glyph
= fun g v ->
match v.position with
| `Above -> { g with tehta_above = Some v }
| `Below -> { g with tehta_below = Some v }
type 'a t =
| Consonant of 'a consonant
| Voyel of 'a voyel
| Application of ('a t -> 'a t list)
| Repr of string
| Glyph of 'a glyph
| Nothing
let none = Nothing
let space s = Repr s
let nasal m ng n letter =
Application
( function
| Consonant { category = II; _} as f ->
let Consonant c = m [@@warning "-8"] in
let g = Glyph
{empty_glyph with
tengwa = Some c
; tehta_above = Some letter } in
g::f::[]
| Consonant { category = III; _} as f ->
let Consonant c = ng [@@warning "-8"] in
let g = Glyph
{empty_glyph with
tengwa = Some c
; tehta_above = Some letter } in
g::f::[]
| f ->
let Consonant c = n [@@warning "-8"] in
let g = Glyph
{empty_glyph with
tengwa = Some c
; tehta_above = Some letter } in
g::f::[]
)
let diphtongue
: 'a t -> 'a t -> 'a t
= fun t1 t2 ->
match t1 with
| Consonant c->
let semi_voyel =
Glyph
{ empty_glyph with tengwa = Some c} in
Application (fun t -> semi_voyel::t2::t::[])
| _ ->
print_endline "Ignoring diphtongue";
Nothing
let fold
: portant:'a consonant -> 'a t list -> string
= fun ~portant elems ->
let buff = Buffer.create 16 in
let rec _fold
: 'a glyph option -> 'a t list -> unit
= fun init -> function
| [] ->
begin match init with
| None -> ()
| Some glyph ->
repr_glyph ~portant glyph buff
end
| hd::tl ->
match init, hd with
| any, Nothing -> _fold any tl
| None, Consonant c ->
_fold
(Some {empty_glyph with tengwa = Some c})
tl
| None, Voyel v ->
_fold
(Some (
add_voyel_to_glyph
{empty_glyph with tehta_above = Some v}
v) )
tl
| None, Repr r ->
Buffer.add_string buff r;
_fold
None tl
| any, Application n ->
let next, rest = match tl with
| [] -> Nothing, []
| other::ll -> other, ll in
let result = n next in
_fold any (result @ rest)
| Some t, Repr s ->
repr_glyph ~portant t buff;
Buffer.add_string buff s;
_fold
None
tl
| Some ({ tengwa = Some _ ; _} as t), Consonant c ->
repr_glyph ~portant t buff;
_fold
(Some {empty_glyph with tengwa = Some c})
tl
| Some ({ tehta_below = Some _ ; _} as t), Voyel ({position = `Below; _} as v) ->
repr_glyph ~portant t buff;
_fold
(Some {empty_glyph with tehta_below = Some v})
tl
| Some ({ tehta_below = Some _ ; _} as t), Consonant c ->
repr_glyph ~portant t buff;
_fold
(Some {empty_glyph with tengwa = Some c})
tl
| Some t, Voyel ({position = `Above; _} as v) ->
repr_glyph ~portant t buff;
_fold
(Some {empty_glyph with tehta_above = Some v})
tl
| Some t, Voyel v ->
_fold
(Some (add_voyel_to_glyph t v))
tl
| Some ({ tengwa = None ; _} as t), Consonant c ->
_fold
(Some {t with tengwa = Some c})
tl
| None, Glyph g ->
_fold
(Some g)
tl
| Some g1, Glyph g2 ->
begin match combine_glyph g1 g2 with
| Some _ as res ->
_fold
res
tl
| None ->
repr_glyph ~portant g1 buff;
_fold
(Some g2)
tl
end
in
_fold None elems;
Buffer.contents buff
|
