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(* source: Synario VHDL Reference Manual - March 1997 *)

(************************************************************************************)		   

(*                       Types                                                      *)

(************************************************************************************)		   

type vhdl_type_t =

  | Base of string

  | Range of string option * int * int

  | Bit_vector of int * int			  

  | Array of int * int * vhdl_type_t 

  | Enumerated of string list

let rec pp_vhdl_type fmt t =

  match t with

  | Base s -> Format.fprintf fmt "%s" s 

  | Bit_vector (n,m) -> Format.fprintf fmt "bit_vector(%i downto %i)" n m

  | Range(base, n, m) -> Format.fprintf fmt "%trange %i to %i" (fun fmt -> match base with Some s -> Format.fprintf fmt "%s " s | None -> ()) n m

  | Array (n, m, base) -> Format.fprintf fmt "array (%i to %i) of %a" n m pp_vhdl_type base

  | Enumerated sl -> Format.fprintf fmt "(%a)" (Utils.fprintf_list ~sep:", " Format.pp_print_string) sl

type cst_val_t = CstInt of int | CstStdLogic of string | CstBV of string * string

  | CstBV (pref,suff) -> Format.fprintf fmt "%s\"%s\"" pref suff

(************************************************************************************)		   

(*                     Declarations                                                 *)

(************************************************************************************)		   

(* TODO ? Shall we merge definition / declaration ? Do they appear at the same

place or at different ones ? *)

type vhdl_definition_t =

  | Type of {name : string ; definition: vhdl_type_t}

  | Subtype of {name : string ; definition: vhdl_type_t}

let pp_vhdl_definition fmt def =

  match def with

  | Type s -> Format.fprintf fmt "type %s is %a;" s.name pp_vhdl_type s.definition

  | Subtype s -> Format.fprintf fmt "subtype %s is %a;" s.name pp_vhdl_type s.definition

type vhdl_declaration_t =

  | VarDecl of { name : string; typ : vhdl_type_t; init_val : cst_val_t option }

  | CstDecl of { name : string; typ : vhdl_type_t; init_val : cst_val_t  }

  | SigDecl of { name : string; typ : vhdl_type_t; init_val : cst_val_t option }

let pp_vhdl_declaration fmt decl =

  match decl with

  | VarDecl v -> Format.fprintf

		   fmt

		   "variable %s : %a%t;"

		   v.name

		   pp_vhdl_type v.typ

		   (fun fmt -> match v.init_val with Some initv -> Format.fprintf fmt " := %a" pp_cst_val initv | _ -> ())

  | CstDecl v -> Format.fprintf

		   fmt

		   "constant %s : %a := %a;"

		   v.name

		   pp_vhdl_type v.typ

		   pp_cst_val v.init_val

  | SigDecl v -> Format.fprintf

		   fmt

		   "signal %s : %a%t;"

		   v.name

		   pp_vhdl_type v.typ

		   (fun fmt -> match v.init_val with Some initv -> Format.fprintf fmt " := %a" pp_cst_val initv | _ -> ())

let pp_type_attribute pp_val fmt tatt =

  match tatt with

  | TAttNoArg a -> Format.fprintf fmt "'%s" a.id

  | TAttIntArg a -> Format.fprintf fmt "'%s(%i)" a.id a.arg

  | TAttValArg a -> Format.fprintf fmt "'%s(%a)" a.id pp_val a.arg

  | TAttStringArg a -> Format.fprintf fmt "'%s(%s)" a.id a.arg

type vhdl_array_attributes_t = AAttInt of { id: string; arg: int; } | AAttAscending

let pp_array_attribute fmt aatt =

  match aatt with

  | AAttInt a -> Format.fprintf fmt "'%s(%i)" a.id a.arg

  | AAttAscending -> Format.fprintf fmt "'ascending"

type vhdl_signal_attributes_t = SigAtt of string

let pp_signal_attribute fmt sa = match sa with

  | SigAtt s -> Format.fprintf fmt "'%s" s

let signal_att = [ "event"; "stable"; "last_value" ]

type vhdl_string_attributes_t = StringAtt of string

let pp_string_attribute fmt sa = match sa with

  | StringAtt s -> Format.fprintf fmt "'%s" s

let signal_att = [ "simple_name"; "path_name"; "instance_name" ]

(* TODO: call to functions? procedures? component instanciations ? *)

type suffix_selection_t = Idx of int | Range of int * int

let pp_suffix_selection fmt sel =

  match sel with

  | Idx n -> Format.fprintf fmt "(%i)" n

  | Range(n,m) -> Format.fprintf fmt "(%i downto %i)" n m

type vhdl_expr_t =

  | Cst of cst_val_t 

  | Var of string (* a signal or a variable *)

  | Sig of { name: string; att: vhdl_signal_attributes_t option }

  | SuffixMod of { expr : vhdl_expr_t; selection : suffix_selection_t }

  | Op of { id: string; args: vhdl_expr_t list } 

let rec pp_vhdl_expr fmt e =

  match e with

  | Cst c ->  pp_cst_val fmt c

  | Var s -> Format.fprintf fmt "%s" s

  | Sig s -> Format.fprintf

	       fmt

	       "%s%t"

	       s.name

	       (fun fmt -> match s.att with None -> () | Some att -> pp_signal_attribute fmt att)

  | SuffixMod s ->

     Format.fprintf fmt "%a %a"

		    pp_vhdl_expr s.expr

		    pp_suffix_selection s.selection

  | Op op -> (

    match op.args with

    | [] -> assert false

    | [ e1; e2] -> Format.fprintf fmt "@[<hov 3>%a %s %a@]" pp_vhdl_expr e1 op.id pp_vhdl_expr e2

    | _ -> assert false (* all ops are binary up to now *)

    (* | _ -> Format.fprintf fmt "@[<hov 3>%s (%a)@]" op.id (Utils.fprintf_list ~sep:",@ " pp_vhdl_expr) op.args *)

  )

(* Available operators in the standard library. There are some restrictions on

types. See reference doc. *)

let arith_funs = ["+";"-";"*";"/";"mod"; "rem";"abs";"**"]

let rel_funs   = ["<";">";"<=";">=";"/=";"="]

type vhdl_if_case_t = {

  }	   

 and vhdl_sequential_stmt_t = 

   | VarAssign of { lhs: string; rhs: vhdl_expr_t }

   | SigSeqAssign of { lhs: string; rhs: vhdl_expr_t }

   | If of { if_cases: vhdl_if_case_t list;

	    default: (vhdl_sequential_stmt_t list) option; }

   | Case of { guard: vhdl_expr_t; branches: vhdl_case_item_t list }

and vhdl_case_item_t = {

    when_cond: vhdl_expr_t;

    when_stmt: vhdl_sequential_stmt_t;

let rec pp_vhdl_sequential_stmt fmt stmt =

  match stmt with

  | VarAssign va -> Format.fprintf fmt "%s := %a;" va.lhs pp_vhdl_expr va.rhs

  | SigSeqAssign va -> Format.fprintf fmt "%s <= %a;" va.lhs pp_vhdl_expr va.rhs

  | If ifva -> (

     List.iteri (fun idx ifcase ->

		 if idx = 0 then

		   Format.fprintf fmt "@[<v 3>if"

		 else

		   Format.fprintf fmt "@ @[<v 3>elsif";

		 Format.fprintf fmt " %a then@ %a@]"

				pp_vhdl_expr ifcase.if_cond

				pp_vhdl_sequential_stmts ifcase.if_block

		) ifva.if_cases;

     let _ =

       match ifva.default with

       | None -> ()

       | Some bl -> Format.fprintf fmt "@ @[<v 3>else@ %a@]" pp_vhdl_sequential_stmts bl

     in

     Format.fprintf fmt "@ end if;"

  )

  | Case caseva -> (

    Format.fprintf fmt "@[<v 3>case %a is@ %a@]@ end case;"

		   pp_vhdl_expr caseva.guard

		   (Utils.fprintf_list ~sep:"@ " pp_vhdl_case) caseva.branches

  )

and pp_vhdl_sequential_stmts fmt l  = Utils.fprintf_list ~sep:"@ " pp_vhdl_sequential_stmt fmt l

and pp_vhdl_case fmt case =

  Format.fprintf fmt "when %a => %a"

		 pp_vhdl_expr case.when_cond

		 pp_vhdl_sequential_stmt case.when_stmt

type signal_condition_t =

    expr: vhdl_expr_t;              (* when expression *)

    else_case: vhdl_expr_t option;  (* optional else case expression. 

type signal_selection_t =

    sel_lhs: string;

    when_sel: vhdl_expr_t option;

type conditional_signal_t =

      lhs: string;                        (* assigned signal *)

      rhs: vhdl_expr_t;                   (* expression *)

      cond: signal_condition_t option     (* conditional signal statement *)

type process_t =

  { id: string option; active_sigs: string list; body: vhdl_sequential_stmt_t list }

type selected_signal_t = { sel: vhdl_expr_t;  branches: signal_selection_t list }

  | SigAssign of conditional_signal_t 

  | Process of process_t 

  | SelectedSig of selected_signal_t

let pp_vhdl_concurrent_stmt fmt stmt =

  let pp_sig_cond fmt va = 

    Format.fprintf

      fmt

      "%s <= %a%t;"

      va.lhs

      pp_vhdl_expr va.rhs

      (fun fmt -> match va.cond with

		  | None -> ()

		  | Some cond ->

		     Format.fprintf

		       fmt

		       " when %a%t"

		       pp_vhdl_expr cond.expr

		       (fun fmt -> match cond.else_case with

				   | None -> ()

				   | Some else_case ->

				      Format.fprintf

					fmt

					" else %a"

					pp_vhdl_expr else_case

		       )

      )

  in

  let pp_process fmt p =

    Format.fprintf

      fmt

      "@[<v 0>%tprocess %a@ @[<v 3>begin@ %a@]@ end process;@]"

      (fun fmt -> match p.id with Some id -> Format.fprintf fmt "%s: " id| None -> ())

      (fun fmt asigs ->

       if asigs <> [] then

	 Format.fprintf

	   fmt

	   "(@[<hov 0>%a)@]"

	   (Utils.fprintf_list ~sep:",@ " Format.pp_print_string) asigs)

      p.active_sigs

      (Utils.fprintf_list ~sep:"@ " pp_vhdl_sequential_stmt) p.body

  in

  let pp_sig_sel fmt va =

    Format.fprintf fmt "@[<v 3>with %a select@ %a;@]"

		   pp_vhdl_expr va.sel

		   (Utils.fprintf_list

		      ~sep:"@ "

		      (fun fmt b ->

		       Format.fprintf

			 fmt

			 "%s <= %a when %t"

			 b.sel_lhs

			 pp_vhdl_expr b.expr

			 (fun fmt -> match b.when_sel with

				     | None -> Format.fprintf fmt "others"

				     | Some w -> pp_vhdl_expr fmt w

			 ))

		   ) va.branches  in

  match stmt with

  | SigAssign va -> pp_sig_cond fmt va       

  | Process p -> pp_process fmt p

  | SelectedSig va -> pp_sig_sel fmt va

(* TODO? Seems to appear optionally in entities *)

type vhdl_generic_t = unit

let pp_vhdl_generic fmt g = ()

type vhdl_port_kind_t = InPort | OutPort | InoutPort | BufferPort

let pp_vhdl_port_kind fmt p =

  match p with

  | InPort -> Format.fprintf fmt "in"

  | OutPort -> Format.fprintf fmt "in"

  | InoutPort -> Format.fprintf fmt "inout"

  | BufferPort -> Format.fprintf fmt "buffer"

    name: string;

    kind: vhdl_port_kind_t;

    typ: vhdl_type_t;

let pp_vhdl_port fmt p =

  Format.fprintf fmt "%s : %a %a"

		 p.name

		 pp_vhdl_port_kind p.kind

		 pp_vhdl_type p.typ

    name: string;

    generics: vhdl_generic_t list;

    ports: vhdl_port_t list;

let pp_vhdl_entity fmt e =

  Format.fprintf

    fmt

    "@[<v 3>entity %s is@ %t%t@]@ end %s;@ "

    e.name

    (fun fmt -> List.iter (fun g -> Format.fprintf fmt "generic %a;@ " pp_vhdl_generic g) e.generics)

    (fun fmt ->

     if e.ports = [] then () else

       Format.fprintf fmt "port (@[<hov 0>%a@]);" (Utils.fprintf_list ~sep:",@ " pp_vhdl_port) e.ports)

    e.name

    name: string;

    shared_defs: vhdl_definition_t list;

let pp_vhdl_package fmt p =

  Format.fprintf

    fmt

    "@[<v 3>package %s is@ %a@]@ end %s;@ "

    p.name

    (Utils.fprintf_list  ~sep:"@ " pp_vhdl_definition) p.shared_defs

    p.name

type vhdl_load_t = Library of string | Use of string list

let pp_vhdl_load fmt l =

  match l with

  | Library s -> Format.fprintf fmt "library %s;@ " s

  | Use sl -> Format.fprintf fmt "use %a;@ " (Utils.fprintf_list ~sep:"." Format.pp_print_string) sl

    name: string;

    entity: string;

    declarations: vhdl_declaration_t list;

    body: vhdl_concurrent_stmt_t list;

let pp_vhdl_architecture fmt a =

  Format.fprintf

    fmt

    "@[<v 3>architecture %s of %s is@ %a@]@ @[<v 3>begin@ %a@]@ end %s;"

    a.name

    a.entity

    (Utils.fprintf_list ~sep:"@ " pp_vhdl_declaration) a.declarations

    (Utils.fprintf_list ~sep:"@ " pp_vhdl_concurrent_stmt) a.body

    a.name

(* TODO. Configuraiton is optional *)

let pp_vhdl_configuration fmt c = ()

type vhdl_design_t =

    packages: vhdl_package_t list;

    libraries: vhdl_load_t list;

    entities: vhdl_entity_t list;

    architectures: vhdl_architecture_t list;

    configuration: vhdl_configuration_t option;

let pp_vhdl_design fmt d =

  Format.fprintf

    fmt

    "@[<v 0>%a%t%a%t%a%t%a%t@]"

    (Utils.fprintf_list ~sep:"@ " pp_vhdl_package) d.packages

    (fun fmt -> if d.packages <> [] then Format.fprintf fmt "@ ")

    (Utils.fprintf_list ~sep:"@ " pp_vhdl_load) d.libraries

    (fun fmt -> if d.libraries <> [] then Format.fprintf fmt "@ ")

    (Utils.fprintf_list ~sep:"@ " pp_vhdl_entity) d.entities

    (fun fmt -> if d.entities <> [] then Format.fprintf fmt "@ ")

    (Utils.fprintf_list ~sep:"@ " pp_vhdl_architecture) d.architectures

    (fun fmt -> if d.architectures <> [] then Format.fprintf fmt "@ ")