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(********************************************************************)
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(*                                                                  *)
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(*  The LustreC compiler toolset   /  The LustreC Development Team  *)
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(*  Copyright 2012 -    --   ONERA - CNRS - INPT - LIFL             *)
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(*                                                                  *)
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(*  LustreC is free software, distributed WITHOUT ANY WARRANTY      *)
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(*  under the terms of the GNU Lesser General Public License        *)
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(*  version 2.1.                                                    *)
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(*                                                                  *)
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(********************************************************************)
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(* Parts of this file come from the Prelude compiler *)
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open LustreSpec
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open Type_predef
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open Clock_predef
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open Delay_predef
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open Dimension
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module TE = Env
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let static_op ty =
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  type_static (mkdim_var ()) ty
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let type_env =
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  List.fold_left
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    (fun env (op, op_type) -> TE.add_value env op op_type)
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    TE.initial
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    [
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      "true", (static_op type_bool);
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      "false", (static_op type_bool);
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      "+", (static_op type_bin_poly_op);
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      "uminus", (static_op type_unary_poly_op);
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      "-", (static_op type_bin_poly_op);
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      "*", (static_op type_bin_poly_op);
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      "/", (static_op type_bin_poly_op);
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      "mod", (static_op type_bin_int_op);
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      "&&", (static_op type_bin_bool_op);
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      "||", (static_op type_bin_bool_op);
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      "xor", (static_op type_bin_bool_op);
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      "equi", (static_op type_bin_bool_op);
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      "impl", (static_op type_bin_bool_op);
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      "<", (static_op type_bin_comp_op);
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      "<=", (static_op type_bin_comp_op);
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      ">", (static_op type_bin_comp_op);
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      ">=", (static_op type_bin_comp_op);
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      "!=", (static_op type_bin_comp_op);
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      "=", (static_op type_bin_comp_op);
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      "not", (static_op type_unary_bool_op)
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]
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module CE = Env
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let clock_env =
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  let init_env = CE.initial in
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  let env' =
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    List.fold_right (fun op env -> CE.add_value env op ck_nullary_univ)
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      ["true"; "false"] init_env in
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  let env' =
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    List.fold_right (fun op env -> CE.add_value env op ck_unary_univ)
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      ["uminus"; "not"] env' in
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  let env' =
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    List.fold_right (fun op env -> CE.add_value env op ck_bin_univ)
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      ["+"; "-"; "*"; "/"; "mod"; "&&"; "||"; "xor"; "equi"; "impl"; "<"; "<="; ">"; ">="; "!="; "="] env' in
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  env'
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module DE = Env
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let delay_env =
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  let init_env = DE.initial in
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  let env' =
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    List.fold_right (fun op env -> DE.add_value env op delay_nullary_poly_op)
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      ["true"; "false"] init_env in
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  let env' =
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    List.fold_right (fun op env -> DE.add_value env op delay_unary_poly_op)
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      ["uminus"; "not"] env' in
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  let env' =
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    List.fold_right (fun op env -> DE.add_value env op delay_binary_poly_op)
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      ["+"; "-"; "*"; "/"; "mod"; "&&"; "||"; "xor"; "equi"; "impl"; "<"; "<="; ">"; ">="; "!="; "="] env' in
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  let env' =
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    List.fold_right (fun op env -> DE.add_value env op delay_ternary_poly_op)
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      [] env' in
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  env'
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module VE = Env
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let eval_env =
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  let defs = [
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    "uminus", (function [Dint a] -> Dint (-a)           | _ -> assert false);
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    "not", (function [Dbool b] -> Dbool (not b)         | _ -> assert false);
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    "+", (function [Dint a; Dint b] -> Dint (a+b)       | _ -> assert false);
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    "-", (function [Dint a; Dint b] -> Dint (a-b)       | _ -> assert false);
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    "*", (function [Dint a; Dint b] -> Dint (a*b)       | _ -> assert false);
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    "/", (function [Dint a; Dint b] -> Dint (a/b)       | _ -> assert false);
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    "mod", (function [Dint a; Dint b] -> Dint (a mod b) | _ -> assert false);
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    "&&", (function [Dbool a; Dbool b] -> Dbool (a&&b)  | _ -> assert false);
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    "||", (function [Dbool a; Dbool b] -> Dbool (a||b)  | _ -> assert false);
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    "xor", (function [Dbool a; Dbool b] -> Dbool (a<>b) | _ -> assert false);
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    "equi", (function [Dbool a; Dbool b] -> Dbool (a=b) | _ -> assert false);
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    "impl", (function [Dbool a; Dbool b] -> Dbool (a<=b)| _ -> assert false);
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    "<", (function [Dint a; Dint b] -> Dbool (a<b)      | _ -> assert false);
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    ">", (function [Dint a; Dint b] -> Dbool (a>b)      | _ -> assert false);
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    "<=", (function [Dint a; Dint b] -> Dbool (a<=b)    | _ -> assert false);
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    ">=", (function [Dint a; Dint b] -> Dbool (a>=b)    | _ -> assert false);
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    "!=", (function [a; b] -> Dbool (a<>b)              | _ -> assert false);
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    "=", (function [a; b] -> Dbool (a=b)                | _ -> assert false);
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  ]
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  in
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  List.fold_left
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    (fun env (op, op_eval) -> VE.add_value env op op_eval)
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    VE.initial
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    defs
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let arith_funs = ["+";"-";"*";"/";"mod"; "uminus"]
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let bool_funs  = ["&&";"||";"xor";"equi";"impl"; "not"]
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let rel_funs   = ["<";">";"<=";">=";"!=";"="]
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let internal_funs = arith_funs@bool_funs@rel_funs
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let rec is_internal_fun x targs =
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(*Format.eprintf "is_internal_fun %s %a@." x Types.print_ty (List.hd targs);*)
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  match targs with
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  | []                              -> assert false
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  | t::_ when Types.is_real_type t  -> List.mem x internal_funs && not !Options.mpfr 
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  | t::_ when Types.is_array_type t -> is_internal_fun x [Types.array_element_type t]
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  | _                               -> List.mem x internal_funs
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let is_expr_internal_fun expr =
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  match expr.expr_desc with
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  | Expr_appl (f, e, _) -> is_internal_fun f (Types.type_list_of_type e.expr_type)
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  | _                   -> assert false
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let is_value_internal_fun v =
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  match v.value_desc with
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  | Fun (f, vl) -> is_internal_fun f (List.map (fun v -> v.value_type) vl)
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  | _           -> assert false
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let is_homomorphic_fun x =
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  List.mem x internal_funs
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let is_stateless_fun x =
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  List.mem x internal_funs
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let pp_c i pp_val fmt vl =
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  match i, vl with
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  (*  | "ite", [v1; v2; v3] -> Format.fprintf fmt "(%a?(%a):(%a))" pp_val v1 pp_val v2 pp_val v3 *)
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    | "uminus", [v] -> Format.fprintf fmt "(- %a)" pp_val v
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    | "not", [v] -> Format.fprintf fmt "(!%a)" pp_val v
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    | "impl", [v1; v2] -> Format.fprintf fmt "(!%a || %a)" pp_val v1 pp_val v2
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    | "=", [v1; v2] -> Format.fprintf fmt "(%a == %a)" pp_val v1 pp_val v2
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    | "mod", [v1; v2] -> Format.fprintf fmt "(%a %% %a)" pp_val v1 pp_val v2
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    | "equi", [v1; v2] -> Format.fprintf fmt "(!%a == !%a)" pp_val v1 pp_val v2
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    | "xor", [v1; v2] -> Format.fprintf fmt "(!%a != !%a)" pp_val v1 pp_val v2
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    | _, [v1; v2] -> Format.fprintf fmt "(%a %s %a)" pp_val v1 i pp_val v2
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    | _ -> (Format.eprintf "internal error: Basic_library.pp_c %s@." i; assert false)
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let pp_java i pp_val fmt vl =
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  match i, vl with
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  (*  | "ite", [v1; v2; v3] -> Format.fprintf fmt "(%a?(%a):(%a))" pp_val v1 pp_val v2 pp_val v3 *)
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    | "uminus", [v] -> Format.fprintf fmt "(- %a)" pp_val v
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    | "not", [v] -> Format.fprintf fmt "(!%a)" pp_val v
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    | "impl", [v1; v2] -> Format.fprintf fmt "(!%a || %a)" pp_val v1 pp_val v2
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    | "=", [v1; v2] -> Format.fprintf fmt "(%a == %a)" pp_val v1 pp_val v2
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    | "mod", [v1; v2] -> Format.fprintf fmt "(%a %% %a)" pp_val v1 pp_val v2
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    | "equi", [v1; v2] -> Format.fprintf fmt "(%a == %a)" pp_val v1 pp_val v2
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    | "xor", [v1; v2] -> Format.fprintf fmt "(%a != %a)" pp_val v1 pp_val v2
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    | _, [v1; v2] -> Format.fprintf fmt "(%a %s %a)" pp_val v1 i pp_val v2
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    | _ -> (Format.eprintf "internal error: Basic_library.pp_java %s@." i; assert false)
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let pp_horn i pp_val fmt vl =
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  match i, vl with
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  | "ite", [v1; v2; v3] -> Format.fprintf fmt "(@[<hov 2>ite %a@ %a@ %a@])" pp_val v1 pp_val v2 pp_val v3
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  | "uminus", [v] -> Format.fprintf fmt "(- %a)" pp_val v
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  | "not", [v] -> Format.fprintf fmt "(not %a)" pp_val v
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  | "=", [v1; v2] -> Format.fprintf fmt "(= %a %a)" pp_val v1 pp_val v2
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  | "&&", [v1; v2] -> Format.fprintf fmt "(and %a %a)" pp_val v1 pp_val v2
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  | "||", [v1; v2] -> Format.fprintf fmt "(or %a %a)" pp_val v1 pp_val v2
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  | "impl", [v1; v2] -> Format.fprintf fmt "(=> %a %a)" pp_val v1 pp_val v2
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  | "mod", [v1; v2] -> Format.fprintf fmt "(mod %a %a)" pp_val v1 pp_val v2
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  | "equi", [v1; v2] -> Format.fprintf fmt "(%a = %a)" pp_val v1 pp_val v2
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  | "xor", [v1; v2] -> Format.fprintf fmt "(%a xor %a)" pp_val v1 pp_val v2
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  | "!=", [v1; v2] -> Format.fprintf fmt "(not (= %a %a))" pp_val v1 pp_val v2
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  | "/", [v1; v2] -> Format.fprintf fmt "(div %a %a)" pp_val v1 pp_val v2
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  | _, [v1; v2] -> Format.fprintf fmt "(%s %a %a)" i pp_val v1 pp_val v2
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  | _ -> (Format.eprintf "internal error: Basic_library.pp_horn %s@." i; assert false)
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(*  | "mod", [v1; v2] -> Format.fprintf fmt "(%a %% %a)" pp_val v1 pp_val v2
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*)
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(* Local Variables: *)
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(* compile-command:"make -C .." *)
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(* End: *)