1 files changed, 31 insertions, 0 deletions
diff --git a/source/xi_lib/types.ml b/source/xi_lib/types.ml
new file mode 100644
index 0000000..14809cc
--- /dev/null
+++ b/source/xi_lib/types.ml
@@ -0,0 +1,31 @@
+
+type normal_type
+  = TP_Int
+  | TP_Bool
+  | TP_Array of normal_type
+
+let rec string_of_normal_type = function
+  | TP_Int -> "int"
+  | TP_Bool -> "bool"
+  | TP_Array el -> string_of_normal_type el ^ "[]"
+
+type extended_type = normal_type list
+
+let string_of_extended_type xs =
+    String.concat ", " @@ List.map string_of_normal_type xs
+
+type result_type
+  = RT_Unit
+  | RT_Void
+
+type env_type
+  = ENVTP_Var of normal_type
+  | ENVTP_Fn of extended_type * extended_type
+
+let string_of_env_type = function
+  | ENVTP_Var t -> string_of_normal_type t
+  | ENVTP_Fn (xs, []) -> Format.sprintf "fn(%s)"
+    (string_of_extended_type xs)
+  | ENVTP_Fn (xs, rs) -> Format.sprintf "fn(%s) -> (%s)"
+    (string_of_extended_type xs)
+    (string_of_extended_type rs)
\ No newline at end of file