1 files changed, 62 insertions, 0 deletions
diff --git a/src/expressions/show_expr.ml b/src/expressions/show_expr.ml
new file mode 100755
index 0000000..3a54929
--- /dev/null
+++ b/src/expressions/show_expr.ml
@@ -0,0 +1,62 @@
+let u = UTF8.from_utf8string
+
+module Show_Expr
+  (R:Sym_ref.SYM_REF with type 'a obs = (UTF8.Buffer.buffer -> unit))
+  (T:Sym_type.SYM_TYPE with type 'a obs = (UTF8.Buffer.buffer -> unit)) = struct
+
+  module T = T
+  module R = R
+
+  type t = unit
+  type repr = UTF8.Buffer.buffer -> unit
+  type obs = UTF8.Buffer.buffer -> unit
+
+  let observe buffer value = buffer value
+
+  let value v () buffer = T.observe v buffer
+
+  let ref r () buffer = R.observe r buffer
+
+  let call0 ident () buffer =
+    let utf8ident = UTF8.to_utf8string ident in
+    UTF8.Printf.bprintf buffer "%s()" utf8ident
+
+  let call1 ident p1 () buffer =
+    let utf8ident = UTF8.to_utf8string ident in
+    UTF8.Printf.bprintf buffer "%s(%a)"
+      utf8ident
+      (fun x b -> observe b x) p1
+
+  let call2 ident p1 p2 () buffer =
+    let utf8ident = UTF8.to_utf8string ident in
+    begin match utf8ident with
+    | "+" | "*" | "-" | "/" | "^" | "="
+    | "<>" | "<=" | ">=" | "<" | ">" ->
+        UTF8.Printf.bprintf buffer "%a%s%a"
+        (fun x b -> observe b x) p1
+          utf8ident
+        (fun x b -> observe b x) p2
+    | _ ->
+      UTF8.Printf.bprintf buffer "%s(%a;%a)"
+        utf8ident
+        (fun x b -> observe b x) p1
+        (fun x b -> observe b x) p2
+    end
+
+  let call3 ident p1 p2 p3 () buffer =
+    let utf8ident = UTF8.to_utf8string ident in
+    UTF8.Printf.bprintf buffer "%s(%a;%a;%a)"
+      utf8ident
+      (fun x b -> observe b x) p1
+      (fun x b -> observe b x) p2
+      (fun x b -> observe b x) p3
+
+  let callN ident (params: repr list) () buffer =
+    UTF8.Buffer.add_string buffer ident;
+    Tools.List.printb ~sep:(u";") (fun buffer value -> value buffer) buffer params
+
+  let expression e () buffer =
+    UTF8.Printf.bprintf buffer "(%a)"
+    (fun x b -> b x) e
+
+end