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(********************************************************************)
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(*                                                                  *)
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(*  The LustreC compiler toolset   /  The LustreC Development Team  *)
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(*  Copyright 2012 -    --   ONERA - CNRS - INPT                    *)
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(*                                                                  *)
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(*  LustreC is free software, distributed WITHOUT ANY WARRANTY      *)
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(*  under the terms of the GNU Lesser General Public License        *)
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(*  version 2.1.                                                    *)
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(*                                                                  *)
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(********************************************************************)
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open Graph
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type rat = int*int
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type ident = string
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type tag = int
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type longident = (string * tag) list
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exception TransposeError of int*int
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(** General utility functions. *)
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let create_hashtable size init =
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  let tbl = Hashtbl.create size in
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  List.iter (fun (key, data) -> Hashtbl.add tbl key data) init;
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  tbl
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module IdentModule =
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struct (* Node module *)
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  type t = ident
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  let compare = compare
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  let hash n = Hashtbl.hash n
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  let equal n1 n2 = n1 = n2
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end
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module IMap = Map.Make(IdentModule)
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module ISet = Set.Make(IdentModule)
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exception DeSome
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let desome x = match x with Some x -> x | None -> raise DeSome
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let option_map f o =
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  match o with
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  | None   -> None
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  | Some e -> Some (f e)
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let add_cons x l =
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 if List.mem x l then l else x::l
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let rec remove_duplicates l =
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 match l with
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 | [] -> []
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 | t::q -> add_cons t (remove_duplicates q)
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let position pred l =
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  let rec pos p l =
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    match l with
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    | [] -> assert false
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    | t::q -> if pred t then p else pos (p+1) q
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  in pos 0 l
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let rec duplicate x n =
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 if n < 0 then [] else x :: duplicate x (n - 1)
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let enumerate n =
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  let rec aux i =
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    if i >= n then [] else i :: aux (i+1)
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  in aux 0
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let rec repeat n f x =
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 if n <= 0 then x else repeat (n-1) f (f x)
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let transpose_list ll =
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  let rec transpose ll =
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    match ll with
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    | []   -> []
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    | [l]  -> List.map (fun el -> [el]) l
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    | l::q -> List.map2 (fun el eq -> el::eq) l (transpose q)
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  in match ll with
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  | []   -> []
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  | l::q -> let length_l = List.length l in
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	    List.iter (fun l' -> let length_l' = List.length l'
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				 in if length_l <> length_l' then raise (TransposeError (length_l, length_l'))) q;
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	    transpose ll
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let rec filter_upto p n l =
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 if n = 0 then [] else
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 match l with
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 | [] -> []
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 | t::q -> if p t then t :: filter_upto p (n-1) q else filter_upto p n q
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(* Warning: bad complexity *)
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let list_of_imap imap =
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  IMap.fold (fun i v (il,vl) -> (i::il,v::vl)) imap ([],[])
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(** [gcd a b] returns the greatest common divisor of [a] and [b]. *)
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let rec gcd a b =
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  if b = 0 then a
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  else gcd b (a mod b)
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(** [lcm a b] returns the least common multiple of [a] and [b]. *)
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let lcm a b =
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  if a = 0 && b = 0 then
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    0
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  else a*b/(gcd a b)
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(** [sum_rat (a,b) (a',b')] returns the sum of rationals [(a,b)] and
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    [(a',b')] *)
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let sum_rat (a,b) (a',b') =
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  if a = 0 && b = 0 then
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    (a',b')
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  else if a'=0 && b'=0 then
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    (a,b)
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  else
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    let lcm_bb' = lcm b b' in
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    (a*lcm_bb'/b+a'*lcm_bb'/b',lcm_bb')
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let simplify_rat (a,b) =
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  let gcd = gcd a b in
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  if (gcd =0) then
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    (a,b)
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  else (a/gcd,b/gcd)
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let max_rat (a,b) (a',b') =
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  let ratio_ab = (float_of_int a)/.(float_of_int b) in
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  let ratio_ab' = (float_of_int a')/.(float_of_int b') in
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  if ratio_ab > ratio_ab' then
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    (a,b)
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  else
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    (a',b')
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(** [list_union l1 l2] returns the union of list [l1] and [l2]. The
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    result contains no duplicates. *)
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let list_union l1 l2 =
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  let rec aux l acc =
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    match l with
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    | [] -> acc
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    | x::tl ->
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        if List.mem x acc then
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          aux tl acc
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        else
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          aux tl (x::acc)
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  in
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  let l1' = aux l1 [] in
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  aux l2 l1'
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(** [hashtbl_add h1 h2] adds all the bindings in [h2] to [h1]. If the
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    intersection is not empty, it replaces the former binding *)
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let hashtbl_add h1 h2 =
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  Hashtbl.iter (fun key value -> Hashtbl.replace h1 key value) h2
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let hashtbl_iterlast h f1 f2 =
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  let l = Hashtbl.length h in
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  ignore(
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  Hashtbl.fold
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    (fun k v cpt ->
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      if cpt = l then
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        begin f2 k v; cpt+1 end
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      else
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        begin f1 k v; cpt+1 end)
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    h 1)
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(** Match types variables to 'a, 'b, ..., for pretty-printing. Type
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    variables are identified by integers. *)
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let tnames = ref ([]: (int * string) list)
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let tname_counter = ref 0
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(* Same for carriers *)
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let crnames = ref ([]: (int * string) list)
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let crname_counter = ref 0
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(* Same for dimension *)
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let dnames = ref ([]: (int * string) list)
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let dname_counter = ref 0
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(* Same for delays *)
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let inames = ref ([]: (int * string) list)
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let iname_counter = ref 0
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let reset_names () =
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  tnames := []; tname_counter := 0; crnames := []; crname_counter := 0; dnames := []; dname_counter := 0; inames := []; iname_counter := 0
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(* From OCaml compiler *)
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let new_tname () =
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  let tname =
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    if !tname_counter < 26
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    then String.make 1 (Char.chr(97 + !tname_counter))
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    else String.make 1 (Char.chr(97 + !tname_counter mod 26)) ^
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      string_of_int(!tname_counter / 26) in
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  incr tname_counter;
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  tname
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let new_crname () =
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  incr crname_counter;
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  Format.sprintf "c%i" (!crname_counter-1)
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let name_of_type id =
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  try List.assoc id !tnames with Not_found ->
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    let name = new_tname () in
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    tnames := (id, name) :: !tnames;
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    name
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let name_of_carrier id =
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  let pp_id =
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    try List.assoc id !crnames with Not_found ->
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      let name = new_crname () in
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      crnames := (id,name) :: !crnames;
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      name
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  in
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  pp_id
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let new_dname () =
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  incr dname_counter;
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  Format.sprintf "d%i" (!dname_counter-1)
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let name_of_dimension id =
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  try List.assoc id !dnames with Not_found ->
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    let name = new_dname () in
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    dnames := (id, name) :: !dnames;
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    name
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let new_iname () =
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  incr iname_counter;
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  Format.sprintf "t%i" (!iname_counter-1)
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let name_of_delay id =
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  try List.assoc id !inames with Not_found ->
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    let name = new_iname () in
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    inames := (id, name) :: !inames;
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    name
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open Format
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let print_rat fmt (a,b) =
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  if b=1 then
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    Format.fprintf fmt "%i" a
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  else
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    if b < 0 then
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      Format.fprintf fmt "%i/%i" (-a) (-b)
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    else
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      Format.fprintf fmt "%i/%i" a b
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(* Generic pretty printing *)
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let pp_final_char_if_non_empty c l =
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  (fun fmt -> match l with [] -> () | _ -> Format.fprintf fmt "%(%)" c)
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let pp_newline_if_non_empty l =
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  (fun fmt -> match l with [] -> () | _ -> Format.fprintf fmt "@,")
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let rec fprintf_list ~sep:sep f fmt = function
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  | []   -> ()
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  | [e]  -> f fmt e
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  | x::r -> Format.fprintf fmt "%a%(%)%a" f x sep (fprintf_list ~sep f) r
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let pp_list l pp_fun beg_str end_str sep_str =
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  if (beg_str="\n") then
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    print_newline ()
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  else
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    print_string beg_str;
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  let rec pp_l l =
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    match l with
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    | [] -> ()
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    | [hd] -> 
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        pp_fun hd
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    | hd::tl ->
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        pp_fun hd;
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        if (sep_str="\n") then
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          print_newline ()
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        else
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          print_string sep_str;
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        pp_l tl
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  in
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  pp_l l;
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  if (end_str="\n") then
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    print_newline ()
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  else
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    print_string end_str
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let pp_array a pp_fun beg_str end_str sep_str =
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  if (beg_str="\n") then
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    print_newline ()
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  else
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    print_string beg_str;
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  let n = Array.length a in
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  if n > 0 then
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    begin
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      Array.iter (fun x -> pp_fun x; print_string sep_str) (Array.sub a 0 (n-1));
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      pp_fun a.(n-1)
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    end;
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  if (end_str="\n") then
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    print_newline ()
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  else
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    print_string end_str
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let pp_iset fmt t =
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  begin
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    Format.fprintf fmt "{@ ";
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    ISet.iter (fun s -> Format.fprintf fmt "%s@ " s) t;
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    Format.fprintf fmt "}@."
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  end
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let pp_hashtbl t pp_fun beg_str end_str sep_str =
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  if (beg_str="\n") then
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    print_newline ()
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  else
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    print_string beg_str;
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  let pp_fun1 k v =
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    pp_fun k v;
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    if (sep_str="\n") then
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      print_newline ()
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    else
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      print_string sep_str
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  in
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  hashtbl_iterlast t pp_fun1 pp_fun;
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  if (end_str="\n") then
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    print_newline ()
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  else
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    print_string end_str
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let pp_longident lid =
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  let pp_fun (nid, tag) =
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    print_string nid;
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    print_string "(";
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    print_int tag;
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    print_string ")"
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  in
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  pp_list lid pp_fun "" "." "."  
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let pp_date fmt tm =
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  Format.fprintf fmt "%i/%i/%i, %i:%i:%i"
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    (tm.Unix.tm_year + 1900)
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    tm.Unix.tm_mon
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    tm.Unix.tm_mday
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    tm.Unix.tm_hour
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    tm.Unix.tm_min
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    tm.Unix.tm_sec
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(* Used for uid in variables *)
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let var_id_cpt = ref 0
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let get_new_id () = incr var_id_cpt;!var_id_cpt
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let track_exception () =
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 if !Options.track_exceptions
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 then (Printexc.print_backtrace stdout; flush stdout)
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 else ()
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(* for lexing purposes *)
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(* Update line number for location info *)
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let incr_line lexbuf =
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  let pos = lexbuf.Lexing.lex_curr_p in
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  lexbuf.Lexing.lex_curr_p <- { pos with
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    Lexing.pos_lnum = pos.Lexing.pos_lnum + 1;
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    Lexing.pos_bol = pos.Lexing.pos_cnum;
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  }
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let last_tag = ref (-1)
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let new_tag () =
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  incr last_tag; !last_tag
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(* Local Variables: *)
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(* compile-command:"make -C .." *)
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(* End: *)