1 files changed, 48 insertions, 0 deletions
diff --git a/src/Verilog/PrettyPrint.ml b/src/Verilog/PrettyPrint.ml
new file mode 100644
index 0000000..786d962
--- /dev/null
+++ b/src/Verilog/PrettyPrint.ml
@@ -0,0 +1,48 @@
+open Extraction.VerilogAST
+
+let concat = String.concat ""
+
+let indent i = String.make (2 * i) ' '
+
+let fold_map f s = List.map f s |> concat
+
+let rec pprint_value = function
+  | VBool l -> if l then "1" else "0"
+  (* Assume that array is flat if it's a literal, should probably be changed to a nat or int *)
+  | VArray a -> concat [List.length a |> string_of_int; "'b"; fold_map pprint_value a]
+
+let pprint_binop = function
+  | Plus -> " + "
+  | Minus -> " - "
+  | Times -> " * "
+  | Divide -> " / "
+  | LT -> " < "
+  | GT -> " > "
+  | LE -> " <= "
+  | GE -> " >= "
+  | Eq -> " == "
+  | And -> " & "
+  | Or -> " | "
+  | Xor -> "^"
+
+let rec pprint_expr = function
+  | Lit l -> pprint_value l
+  | Var s -> List.to_seq s |> String.of_seq
+  | Neg e -> concat ["(-"; pprint_expr e; ")"]
+  | BinOp (op, a, b) -> concat ["("; pprint_expr a; pprint_binop op; pprint_expr b; ")"]
+  | Ternary (c, t, f) -> concat ["("; pprint_expr c; " ? "; pprint_expr t; " : "; pprint_expr f; ")"]
+
+let rec pprint_stmnt i =
+  let pprint_case (e, s) = concat [indent (i + 1); pprint_expr e; ":\n"; pprint_stmnt (i+2) s]
+  in function
+  | Skip -> concat [indent i; ";\n"]
+  | Block s -> concat [indent i; "begin\n"; fold_map (pprint_stmnt (i+1)) s; indent i; "end\n"]
+  | Cond (e, st, sf) -> concat [indent i; "if ("; pprint_expr e; ")\n";
+                                pprint_stmnt (i + 1) st; indent i; "else\n";
+                                pprint_stmnt (i + 1) sf]
+  | Case (e, es) -> concat [indent i; "case ("; pprint_expr e; ")\n";
+                            fold_map pprint_case es; indent i; "endcase"]
+  | Blocking (a, b) -> concat [indent i; pprint_expr a; " = "; pprint_expr b; ";\n"]
+  | Nonblocking (a, b) -> concat [indent i; pprint_expr a; " <= "; pprint_expr b; ";\n"]
+
+let prettyprint = fold_map (pprint_stmnt 0)