58 lines
1.2 KiB
OCaml
58 lines
1.2 KiB
OCaml
type typ =
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| Int of int
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| Float of float
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| Unit
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let typ_to_string = function
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| Int n -> Printf.sprintf "%d" n
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| Float n -> Printf.sprintf "%f" n
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| Unit -> "()"
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type binop =
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| Add | Sub | Mul | Div (* arithmetics *)
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| Mod (* modular operation *)
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| Exp (* exponentation *)
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let binop_to_string = function
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| Add -> "+"
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| Sub -> "-"
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| Mul -> "*"
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| Div -> "/"
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| Mod -> "%"
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| Exp -> "^"
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type t =
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| Value of typ
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| Binop of t * binop * t
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| Set_binop_pre of binop * t
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| Get_binop_pre of binop
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let value v = Value v
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let binop left op right =
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Binop (left, op, right)
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let set_binop_pre op pre =
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Set_binop_pre (op, pre)
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(* print ast LISP style. *)
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let print ast =
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let pr = Printf.printf in
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let pv v = pr "%s" @@ typ_to_string v in
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let rec aux = function
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| Value n -> pv n
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| Binop (left, op, right) -> begin
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pr "(%s " @@ binop_to_string op;
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aux left;
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pr " ";
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aux right;
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pr ")";
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end
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| Set_binop_pre (op, pre) ->
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pr "(set_pre %s " (binop_to_string op);
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aux pre;
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pr ")"
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| Get_binop_pre op ->
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pr "(get_pre %s)" (binop_to_string op)
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in
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aux ast; pr "\n"
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