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(*
This file is part of licht.
licht is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
licht 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with licht. If not, see <http://www.gnu.org/licenses/>.
*)
(** All the types used in the spreadsheet. *)
let u = UTF8.from_utf8string
exception Error
module DataFormat = struct
type _ t =
| Date: DataType.Num.t t (* Date *)
| Number: DataType.Num.t t (* Number *)
| String: DataType.String.t t(* String *)
| Bool: DataType.Bool.t t (* Boolean *)
type formats = F : 'a t -> formats [@@unboxed]
let priority: type a. a t -> int = function
| Date -> 1
| Number -> 0
| String -> 0
| Bool -> 0
let collect_format: DataType.Num.t t -> formats -> DataType.Num.t t = begin
fun dataFormat -> function
| F Date -> Date
| _ -> dataFormat
end
let default_value_for: type a. a t -> a = function
| Date -> DataType.Num.zero
| Number -> DataType.Num.zero
| Bool -> false
| String -> UTF8.empty
type ('a, 'b) equality = Eq : ('a, 'a) equality
let compare_format: type a b. a t -> b t -> (a, b) equality =
fun a b -> begin match a, b with
| Date, Date -> Eq
| String, String -> Eq
| Number, Number -> Eq
| Date, Number -> Eq
| Number, Date -> Eq
| Bool, Bool -> Eq
| _, _ -> raise Errors.TypeError
end
end
module Type = struct
type 'a t =
| Num : DataType.Num.t DataFormat.t * DataType.Num.t -> DataType.Num.t t (** A number *)
| Str : DataType.String.t -> DataType.String.t t (** A string *)
| Bool : DataType.Bool.t -> DataType.Bool.t t (** A boolean *)
let number n = Num (Number, n)
let string s = Str s
let date d = Num (Date, d)
let boolean b = Bool b
let (=) : type a b. a t -> b t -> bool = fun t1 t2 ->
match t1, t2 with
| Num (_, n1), Num (_, n2) -> DataType.Num.eq n1 n2
| Bool b1, Bool b2 -> b1 = b2
| Str s1, Str s2 -> s1 = s2
| _, _ -> false
module Eval(T:Sym_type.SYM_TYPE) = struct
let eval_type : type a. a t -> a T.t = function
| Str s -> T.str s
| Bool b -> T.bool b
| Num (f, n) ->
match f with
| DataFormat.Number -> T.num n
| DataFormat.Date -> T.date n
| _ -> raise Errors.TypeError
let eval t = T.observe (eval_type t)
end
end
module Refs = struct
type t =
| Cell of Cell.t (** A cell *)
| Range of Cell.t * Cell.t (** An area of cells *)
let cell c = Cell c
let range c1 c2 = Range (c1, c2)
module Eval(R:Sym_ref.SYM_REF) = struct
let eval_ref = function
| Cell c -> R.cell c
| Range(c1, c2) -> R.range c1 c2
let eval t = R.observe (eval_ref t)
end
end
module Expr = struct
type ident = UTF8.t
type t =
| Value : 'a Type.t -> t (** A direct value *)
| Ref : Refs.t -> t (** A reference to another cell *)
| Call0 : ident -> t (** A call to a 0 arg function *)
| Call1 : ident * t -> t (** A call to a 1 arg function *)
| Call2 : ident * t * t -> t (** A call to a 2 arg function *)
| Call3 : ident * t * t * t -> t (** A call to a 3 arg function *)
| CallN : ident * t list -> t (** A call to a function *)
| Expression : t -> t (** An expression *)
let value v = Value v
let ref r = Ref r
let call0 ident = Call0 ident
let call1 ident expr = Call1 (ident, expr)
let call2 ident expr1 expr2 = Call2(ident, expr1, expr2)
let call3 ident expr1 expr2 expr3 = Call3(ident, expr1, expr2, expr3)
let callN ident params = CallN(ident, params)
let expression e = Expression e
module Eval(E:Sym_expr.SYM_EXPR) = struct
module T = Type.Eval(E.T)
module R = Refs.Eval(E.R)
let eval e = begin
let rec _eval v k = begin match v with
| Ref r -> k @@ E.ref (R.eval_ref r)
| Value v -> k @@ E.value (T.eval_type v)
| Call0 ident -> k @@ E.call0 ident
| Call1 (ident, p1) ->
_eval p1 (fun v1 ->
k @@ E.call1 ident v1)
| Call2 (ident, p1, p2) ->
_eval p1 (fun v1 ->
_eval p2 (fun v2 ->
k @@ E.call2 ident v1 v2))
| Call3 (ident, p1, p2, p3) ->
(_eval[@tailcall]) p1 (fun v1 ->
(_eval[@tailcall]) p2 (fun v2 ->
(_eval[@tailcall]) p3 (fun v3 ->
k @@ E.call3 ident v1 v2 v3)))
| CallN (ident, exprs) ->
let mapped = List.map (fun x -> _eval x (fun x -> x)) exprs in
k @@ E.callN ident mapped
| Expression e ->
(_eval[@tailcall]) e (fun v1 -> k @@ E.expression v1)
end in
E.observe (_eval e (fun x -> x))
end
end
end
module TypeRepr = Type.Eval(Show_type)
module Result = struct
(** Result from a computation *)
type t =
| Ok : 'a Type.t -> t
| Error : exn -> t
let (=) t1 t2 =
match t1, t2 with
| Ok v1, Ok v2 -> Type.(=) v1 v2
| _, _ -> t1 = t2
let show = begin function
| Error x ->
(*
let buffer = Buffer.create 16 in
let b = Format.formatter_of_buffer buffer in
Errors.printf b x;
Format.pp_print_flush b ();
u(Buffer.contents buffer)
*)
u"#Error"
| Ok v ->
let buffer = UTF8.Buffer.create 16 in
TypeRepr.eval v buffer;
UTF8.Buffer.contents buffer
end
end
module ReturnType = struct
type 'a t =
| Num : DataType.Num.t DataFormat.t option -> DataType.Num.t t (** A number *)
| Str : DataType.String.t t (** A string *)
| Bool : DataType.Bool.t t (** A boolean *)
let f_num: DataType.Num.t t = Num None
let f_date: DataType.Num.t t = Num (Some Date)
let f_number: DataType.Num.t t = Num (Some Number)
let f_string: DataType.String.t t = Str
let f_bool: DataType.Bool.t t = Bool
let guess_format_result: type a. a t -> (unit -> DataFormat.formats list) -> a DataFormat.t =
fun return params -> begin match return with
| Str -> DataFormat.String
| Bool -> DataFormat.Bool
| Num (Some x) -> x
| Num None -> List.fold_left DataFormat.collect_format DataFormat.Number (params ())
end
end
|
