Hide counter inside closure

[tiger.ml.git] / compiler / src / lib / tiger / tiger_symbol.ml

diff --git a/compiler/src/lib/tiger/tiger_symbol.ml b/compiler/src/lib/tiger/tiger_symbol.ml
index eb32942..a850406 100644 (file)
--- a/compiler/src/lib/tiger/tiger_symbol.ml
+++ b/compiler/src/lib/tiger/tiger_symbol.ml
@@ -5,19 +5,31 @@ type t =
   ; 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