(* types à définir

(*** regexp ***)
type 'a regexp =
  | Vide
  | Epsilon
  | Lettre of 'a
  | Union of 'a regexp list
  | Concat of 'a regexp list
  | Etoile of 'a regexp
(*** regexp_fin ***)

(*** langloc ***)
type 'a langloc = {
        eps : bool;           (* indique si ε est dans le langage *)
        p     : 'a list;        (* liste représentant P(L) *)
        s     : 'a list;        (* liste représentant S(L) *)
        f     : ('a * 'a) list;}(* liste représentant F(L) *)
(*** langloc_fin ***)

(*** automate ***)
type 'a nda =
    {nQ : int ;      (* nombre d'états *)
    i : int list;         (* états initiaux *)
    f : int list; (* états finals *)
    t : (int * 'a * int) list;}  (* table de transition *)
(*** automate_fin ***)

 *)

#require "unix";;

module Affichage =
  struct
    let s_o_c a =  if a = '"' then
                     "\\\\guill"
                   else if a = '\\' then
                     "\\\\ligne"
                   else if a = ' ' then
                     "\\\\espace"
                   else
                     String.make 1 a

    let s_o_l a =
      let lettre = s_o_c a
      in "\"" ^ lettre ^ "\""

    let s_o_m (a, n) =
      let lettre  = s_o_c a in
      "\"$\	ext{" ^ lettre ^ "}_{" ^ (string_of_int n) ^ "}$\""

    let dot_auto print string_of_lettre auto =
      let lien = "->" in
      print ("digraph G {\n");
      for x = 0 to auto.nQ - 1 do
        print ((string_of_int x) ^ "[style=\"state");
        if List.mem x  auto.i  then
          print ",initial";
        if List.mem x auto.f then
          print ",accepting";
        print ("\", label=\"" ^ (string_of_int x) ^ "\"];\n")
      done;
      List.iter (
          fun (q, a, q') ->
      print ((string_of_int q) ^ lien ^ (string_of_int q'));
      print (" [label=" ^ (string_of_lettre a) ^ "]");
      print ";\n"
        )
        auto.t;
      print "}
"

    let auto_to_file fn string_of_lettre auto =
      let os = open_out fn in
      let print = output_string os in
      print "\\documentclass[tikz]{standalone}\n";
      print "\\usetikzlibrary{automata, positioning, shapes, snakes, arrows}\n";
      print "\\usepackage{dot2texi, amsmath}\n";
      print "\\def\\guill{\"}\n\\def\\ligne{\\textbackslash\\textbackslash}\n\\def\\espace{\\textvisiblespace}\n";
      print "\\begin{document}\n";
      print "\\begin{tikzpicture}[scale=.75,shorten >=1pt,node distance=1cm,auto, initial text={}]\n";
      print "\\begin{dot2tex}[tikz, codeonly, styleonly, options={-t raw}]\n";
      dot_auto (output_string os) string_of_lettre auto;
      print "\\end{dot2tex}\n";
      (*flush os;
      let fd_pipe_exit, fd_pipe_input = Unix.pipe () in
      let outch_input = Unix.out_channel_of_descr fd_pipe_input in
      let pid = Unix.create_process "dot2tex" [|"-f"; "tikz"; "-t"; "raw"; "--codeonly"; "--styleonly"|] (Unix.descr_of_out_channel os) fd_pipe_input Unix.stderr
      in
      dot_auto (output_string outch_input) string_of_lettre auto;
      flush outch_input;
      ignore (Unix.waitpid [Unix.WNOHANG] pid);
      flush os;*)
      print "\\end{tikzpicture}\n";
      print "\\end{document}";
      close_out os


    let run wait cmd =
      if wait then
        ignore (Unix.system cmd)
      else
        ignore (Unix.open_process cmd)

    let rundot fn =
      let bn = try Filename.chop_extension fn with Invalid_argument _ -> fn in
      let pdfn = bn^".pdf" in
      run true ("latexmk -xelatex -cd -shell-escape " ^ (Filename.quote fn));
      pdfn

    let openPDF wait fn =
      run wait ("xdg-open " ^ (Filename.quote fn))

    let vizgraph wait fn =
      let pdfn = rundot fn in
      openPDF wait pdfn

    let rec string_of_regexp sol = function
      | Vide -> "∅"
      | Epsilon -> "ε"
      | Lettre(x) -> sol x
      | Union([]) ->  "∅"
      | Union([x]) -> string_of_regexp sol x
      | Union(le) -> "(" ^ (String.concat "|" (List.map (fun x -> string_of_regexp sol x) le)) ^ ")"
      | Concat(le) -> String.concat "" (List.map (fun x -> string_of_regexp sol x) le)
      | Etoile(x) -> (string_of_regexp sol x)^"*"


end

let string_of_char = String.make 1
let string_of_charint (a, n) = (String.make 1 a) ^ (string_of_int n)

let string_of_regexp = Affichage.string_of_regexp string_of_char
let string_of_regexp_marques = Affichage.string_of_regexp string_of_charint

let afficher_auto a = let fn = (Filename.temp_file "auto" ".tex") in
                      Affichage.auto_to_file fn Affichage.s_o_l a;
                      Affichage.vizgraph false fn

let afficher_auto_marques a = let fn = (Filename.temp_file "auto" ".tex") in
                      Affichage.auto_to_file fn Affichage.s_o_m a;
                      Affichage.vizgraph false fn

let string_of_list f l = "[" ^ (String.concat "; " (List.map f l)) ^"]"