; symbol : int
}
-let nextsym = ref 0
+let next =
+ let counter = ref 0 in
+ fun () ->
+ incr counter;
+ !counter
let symbols = H.create 16
+let unique_of_string name =
+ {name; symbol = next ()}
+
let of_string name =
match H.find_opt symbols name with
| Some symbol ->
{name; symbol}
| None ->
- incr nextsym;
- let symbol = !nextsym in
- H.replace symbols ~key:name ~data:symbol;
- {name; symbol}
+ let t = unique_of_string name in
+ H.replace symbols ~key:t.name ~data:t.symbol;
+ t
let to_string {name; _} =
name
let is_equal {symbol=s1; _} {symbol=s2; _} =
s1 = s2
+
+let show {name; symbol} =
+ Printf.sprintf "Symbol[%S, %d]" name symbol