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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/>.
*)
module Tuple2 = Tools.Tuple2
let u = UTF8.from_utf8string
type t =
| Basic: 'a ScTypes.Type.t -> t (** A direct type *)
| Formula: formula -> t (** A formula *)
| Undefined: t (** The content is not defined *)
and formula =
| Expression of ScTypes.Expr.t (** A valid expression *)
| Error of int * UTF8.t (** When the expression cannot be parsed *)
let is_defined = function
| Undefined -> false
| _ -> true
let load content = begin
let content = UTF8.to_utf8string content in
if String.length content > 0 then (
if content.[0] = '=' then (
(* If the string start with a '=', load it as a formula *)
Formula (
try
Expression (
Lexing.from_string content
|> ExpressionParser.value ExpressionLexer.read)
with _ -> Error (1, UTF8.from_utf8string content)
)
) else (
(* First try to load the data with basic types, and fallback with string *)
let content' =
try String.sub content 0 (String.index content '\000')
with Not_found -> content in
try
let ScTypes.Result.Ok r =
ExpressionParser.content ExpressionLexer.read
@@ Lexing.from_string content' in
Basic r
with _ -> Basic (ScTypes.Type.string (UTF8.from_utf8string content'))
)
) else (
(* If the string in empty, build an undefined value *)
Undefined
)
end
let load_expr expr = expr
module EvalExpr = ScTypes.Expr.Eval(Evaluate)
(** Extract the parameters to give to a function.
return an Error if one of them is an error
*)
let eval expr catalog mapper = begin
begin try match expr with
| Basic value -> ScTypes.Result.Ok value
| Formula (Expression e) -> EvalExpr.eval e (catalog, mapper)
| Formula (Error (i, s)) -> ScTypes.Result.Error ScTypes.Error
| Undefined -> ScTypes.Result.Error Not_found
with ex -> ScTypes.Result.Error ex
end
end
module EvalSources = ScTypes.Expr.Eval(Collect_sources)
let collect_sources = begin function
| Formula (Expression f) -> EvalSources.eval f Cell.Set.empty
| _ -> Cell.Set.empty
end
module Shifter = ScTypes.Expr.Eval(Shift_expr)
module Printer = ScTypes.Expr.Eval(Show_expr.Show_Expr(Show_ref)(Show_type))
(** Inherit the default representation, but print the float with all decimals *)
module LongPrinter = ScTypes.Type.Eval(struct
include Show_type
let num n buffer =
if DataType.Num.is_integer n then
DataType.Num.to_int n
|> string_of_int
|> UTF8.from_utf8string
|> UTF8.Buffer.add_string buffer
else
let f = DataType.Num.to_float n
and to_b = UTF8.Format.formatter_of_buffer buffer in
ignore @@ UTF8.Format.fprintf to_b "%f" f;
Format.pp_print_flush to_b ()
end)
let show e =
let buffer = UTF8.Buffer.create 16 in
begin match e with
| Formula (Expression f) ->
UTF8.Buffer.add_char buffer '=';
Printer.eval f buffer
| Basic b -> LongPrinter.eval b buffer
| Formula (Error (i,s)) -> UTF8.Buffer.add_string buffer s
| Undefined -> ()
end;
UTF8.Buffer.contents buffer
let shift vector = function
| Formula (Expression f) -> Formula (Expression (Shifter.eval f vector))
| other -> other
let (=) t1 t2 = match t1, t2 with
| Basic b1, Basic b2 -> ScTypes.Type.(=) b1 b2
| o1, o2 -> Pervasives.(=) o1 o2
|
