Start working on pretty-printing

4 files changed, 144 insertions, 6 deletions

diff --git a/src/Interpreter.ml b/src/Interpreter.ml
index b8daf38d..ca821f5b 100644
--- a/src/Interpreter.ml
+++ b/src/Interpreter.ml
@@ -91,13 +91,13 @@ and end_borrow_get_borrow_in_values config l outer_borrows vl0 :
           (res, v' :: vl')
       | _ -> (res, v' :: vl))
 
-(*let rec end_borrow_get_borrow_in_env config l env : borrow_lres * env =
-  match env with
+(*let rec end_borrow_get_borrow_in_env config l env0 : borrow_lres * env =
+  match env0 with
   | [] -> NotFound
-  | Var (x, v) :: env' -> (
+  | Var (x, v) :: env -> (
       match end_borrow_get_borrow_in_value config None l v with
       | NotFound, v' ->
-          let res, env'' = end_borrow_get_borrow_in_env config l env' in
+          let res, env' = end_borrow_get_borrow_in_env config l env' in
           (res, Var (x, v') :: env'')
       | res, v' -> (res, Var (x, v') :: env'))
   | Abs _ :: _ -> unimplemented __LOC__*)
diff --git a/src/Print.ml b/src/Print.ml
new file mode 100644
index 00000000..adcce831
--- /dev/null
+++ b/src/Print.ml
@@ -0,0 +1,133 @@
+open Errors
+open Identifiers
+open Types
+
+let type_var_to_string (tv : type_var) : string = tv.tv_name
+
+let region_var_to_string (rv : region_var) : string =
+  match rv.rv_name with
+  | Some name -> name
+  | None -> RegionVarId.to_string rv.rv_index
+
+let region_to_string (rid_to_string : 'rid -> string) (r : 'rid region) : string
+    =
+  match r with Static -> "'static" | Var rid -> rid_to_string rid
+
+let erased_region_to_string (_ : erased_region) : string = "'_"
+
+let ref_kind_to_string (rk : ref_kind) : string =
+  match rk with Mut -> "Mut" | Shared -> "Shared"
+
+let assumed_ty_to_string (_ : assumed_ty) : string = "Box"
+
+(* TODO: This is probably not the most OCaml-like way of doing this *)
+type 'r type_formatter = {
+  r_to_string : 'r -> string;
+  type_var_id_to_string : TypeVarId.id -> string;
+  type_def_id_to_string : TypeDefId.id -> string;
+}
+
+let integer_type_to_string = function
+  | Isize -> "isize"
+  | I8 -> "i8"
+  | I16 -> "i16"
+  | I32 -> "i32"
+  | I64 -> "i64"
+  | I128 -> "i128"
+  | Usize -> "usize"
+  | U8 -> "u8"
+  | U16 -> "u16"
+  | U32 -> "u32"
+  | U64 -> "u64"
+  | U128 -> "u128"
+
+let rec ty_to_string (fmt : 'r type_formatter) (ty : 'r ty) : string =
+  match ty with
+  | Adt (id, regions, tys) ->
+      let params = params_to_string fmt regions tys in
+      fmt.type_def_id_to_string id ^ params
+  | TypeVar tv -> fmt.type_var_id_to_string tv
+  | Bool -> "bool"
+  | Char -> "char"
+  | Never -> "⊥"
+  | Integer int_ty -> integer_type_to_string int_ty
+  | Str -> "str"
+  | Array aty -> "[" ^ ty_to_string fmt aty ^ "; ?]"
+  | Slice sty -> "[" ^ ty_to_string fmt sty ^ "]"
+  | Ref (r, rty, ref_kind) -> (
+      match ref_kind with
+      | Mut -> "&" ^ fmt.r_to_string r ^ " mut (" ^ ty_to_string fmt rty ^ ")"
+      | Shared -> "&" ^ fmt.r_to_string r ^ " (" ^ ty_to_string fmt rty ^ ")")
+  | Tuple tys ->
+      "(" ^ String.concat ",  " (List.map (ty_to_string fmt) tys) ^ ")"
+  | Assumed (aty, regions, tys) -> (
+      let params = params_to_string fmt regions tys in
+      match aty with Box -> "std::boxed::Box" ^ params)
+
+and params_to_string fmt (regions : 'r list) (types : 'r ty list) : string =
+  if List.length regions + List.length types > 0 then
+    let regions = List.map fmt.r_to_string regions in
+    let types = List.map (ty_to_string fmt) types in
+    let params = String.concat ", " (List.append regions types) in
+    "<" ^ params ^ ">"
+  else ""
+
+let rty_to_string fmt (ty : rty) : string = ty_to_string fmt ty
+
+let ety_to_string fmt (ty : ety) : string = ty_to_string fmt ty
+
+let field_to_string fmt (f : field) : string =
+  f.field_name ^ " : " ^ ty_to_string fmt f.field_ty
+
+let variant_to_string fmt (v : variant) : string =
+  v.variant_name ^ "("
+  ^ String.concat ", "
+      (List.map (field_to_string fmt) (FieldId.vector_to_list v.fields))
+  ^ ")"
+
+let name_to_string (name : name) : string = String.concat "::" name
+
+let type_def_to_string (type_def_id_to_string : TypeDefId.id -> string)
+    (def : type_def) : string =
+  let regions : region_var list =
+    RegionVarId.vector_to_list def.region_params
+  in
+  let types : type_var list = TypeVarId.vector_to_list def.type_params in
+  let rid_to_string rid =
+    match List.find_opt (fun rv -> rv.rv_index = rid) regions with
+    | Some rv -> region_var_to_string rv
+    | None -> unreachable __LOC__
+  in
+  let r_to_string = region_to_string rid_to_string in
+  let type_var_id_to_string id =
+    match List.find_opt (fun tv -> tv.tv_index = id) types with
+    | Some tv -> type_var_to_string tv
+    | None -> unreachable __LOC__
+  in
+  let fmt = { r_to_string; type_var_id_to_string; type_def_id_to_string } in
+  let name = name_to_string def.name in
+  let params =
+    if List.length regions + List.length types > 0 then
+      let regions = List.map region_var_to_string regions in
+      let types = List.map type_var_to_string types in
+      let params = String.concat ", " (List.append regions types) in
+      "<" ^ params ^ ">"
+    else ""
+  in
+  match def.kind with
+  | Struct fields ->
+      let fields = FieldId.vector_to_list fields in
+      if List.length fields > 0 then
+        let fields =
+          String.concat ","
+            (List.map (fun f -> "\n  " ^ field_to_string fmt f) fields)
+        in
+        "struct " ^ name ^ params ^ "{" ^ fields ^ "}"
+      else "struct" ^ name ^ params ^ "{}"
+  | Enum variants ->
+      let variants = VariantId.vector_to_list variants in
+      let variants =
+        List.map (fun v -> "|  " ^ variant_to_string fmt v) variants
+      in
+      let variants = String.concat "\n" variants in
+      "enum " ^ name ^ params ^ " =\n" ^ variants
diff --git a/src/Types.ml b/src/Types.ml
index ef8eccf1..da01d73f 100644
--- a/src/Types.ml
+++ b/src/Types.ml
@@ -11,12 +11,15 @@ module FieldId = IdGen ()
 module RegionVarId = IdGen ()
 
 type type_var = {
-  tv_index : TypeVarId.id;  (** Unique index identifying the variable *)
+  tv_index : TypeVarId.id;
+      (** Unique index identifying the variable - TODO: may be redundant with
+          using indexed vectors *)
   tv_name : string;  (** Variable name *)
 }
 
 type region_var = {
-  rv_index : RegionVarId.id;  (** Unique index identifying the region *)
+  rv_index : RegionVarId.id;
+      (** Unique index identifying the region - TODO: may be redundant *)
   rv_name : string option;  (** Region name *)
 }
 
diff --git a/src/main.ml b/src/main.ml
index 9ba76a18..024209ff 100644
--- a/src/main.ml
+++ b/src/main.ml
@@ -1,5 +1,7 @@
 open CfimOfJson
+
 (*open Interpreter*)
+open Print
 
 let () =
   let json = Yojson.Basic.from_file "../charon/charon/tests/test1.cfim" in