lam_compile_const.ml

(* Copyright (C) 2015-2016 Bloomberg Finance L.P.
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module E = Js_exp_make

let rec translate (x : Lam.constant ) : J.expression = 
  match x with 
  | Const_int i -> E.int (Int32.of_int i)
  | Const_char i ->
    Js_of_lam_string.const_char i
  | Const_int32 i -> E.int i 
  (* E.float (Int32.to_string i) *)
  | Const_int64 i -> 
          (*
            TODO:
       {[
         Int64.to_string 0x7FFFFFFFFFFFFFFFL;;
         - : string = "9223372036854775807"
       ]}
       {[
         Int64.(to_float max_int);;
         - : float = 9.22337203685477581e+18
       ]}
       Note we should compile it to Int64 as JS's 
       speical representation -- 
       it is not representatble in JS number
    *)
    (* E.float (Int64.to_string i) *)
    Js_long.of_const i
  (* https://github.com/google/closure-library/blob/master/closure%2Fgoog%2Fmath%2Flong.js *)
  | Const_nativeint i -> E.nint i 
  | Const_float f -> E.float f (* TODO: preserve float *)
  | Const_string i (*TODO: here inline js*) -> 
    E.str  i 
  | Const_unicode i -> 
    E.unicode i 
    (* E.str i ~delimiter:Literals.escaped_j_delimiter *)   

  | Const_pointer (c,pointer_info) -> 
    E.int ?comment:(Lam_compile_util.comment_of_pointer_info pointer_info)
      (Int32.of_int c )

  | Const_block(tag, tag_info, xs ) -> 
    Js_of_lam_block.make_block NA tag_info 
      (E.small_int  tag) (List.map translate xs)

  | Const_float_array ars -> 
    (* according to the compiler 
        const_float_array is immutable 
       {[ Lprim(Pccall prim_obj_dup, [master]) ]},
        however, we can not translate 
       {[ prim_obj_dup(x) =>  x' ]}
        since x' is now mutable, prim_obj_dup does a copy,

        the compiler does this  is mainly to extract common data into data section, 
        we  deoptimized this in js backend? so it is actually mutable 
    *)
    (* TODO-- *)
    Js_of_lam_array.make_array Mutable Pfloatarray 
      (List.map (fun x ->  E.float  x ) ars)
  (* E.arr Mutable ~comment:"float array" *)
  (*   (List.map (fun x ->  E.float  x ) ars) *)

  | Const_immstring s ->  (*TODO *)
    E.str s  (* TODO: check *)


let translate_arg_cst (cst : Ast_arg.cst) = 
  match cst with 
   | Arg_int_lit i -> 
     E.int (Int32.of_int i)
   | Arg_string_lit i -> 
     E.str i
   | Arg_js_null  -> E.raw_js_code Exp "null"
   | Arg_js_json s 
     -> E.raw_js_code Exp s

   | Arg_js_true  -> E.js_bool true
   | Arg_js_false -> E.js_bool false