parse_env.ml 9.19 KB
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(*pp camlp4o *)
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(*-----------------------------------------------------------------------
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** Copyright (C) 2001, 2002 - Verimag.
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** This file may only be copied under the terms of the GNU Library General
** Public License 
**-----------------------------------------------------------------------
**
** File: parse_env.ml
** Main author: jahier@imag.fr
*)

open Formula

  
type read_arc = Arc of node * arc_info * node

type read_automata = Automata of 
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  node        (* Initial node *)
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  * vnt list  (* Input var list *)
  * vnt list  (* Output var list *)
  * vnt list  (* Local var list *)
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  * vnt list  (* pre var list *)
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  * read_arc list  (* Transition list *)

(* Keywords of the automata format *)
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let lexer = Genlex.make_lexer ["["; "]"; "("; ")"; ","; ":"; ";";
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			       "And"; "Or"; "Not"; "true"; "false";
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			       "="; ">"; ">="; "<"; "<=";
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			       "+"; "-"; "*"; "/"; "mod"; "%"]

type aut_token = Genlex.token Stream.t

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let print_genlex_token = 
  fun tok -> 
    let _ =
      match tok with
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	  Genlex.Kwd(str)    -> print_string (str ^ " \t(Kwd)")
	| Genlex.Ident(str)  -> print_string (str ^ " \t(Ident)")
	| Genlex.Int(i)      -> print_int i; print_string " \t(Int)"
	| Genlex.Float(f)    -> print_float f; print_string " \t(Float)"
	| Genlex.String(str) -> print_string (str ^ " \t(String)")
	| Genlex.Char(c)     -> print_char c ; print_string " \t(Char)"
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    in
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      print_string "\n\t"
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(* false by default because it produces outputs even if everything is fine *)
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let debug_parsing = false

let print_err_msg tok_list func =
  if debug_parsing then
    begin
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      print_string ("* Parse error in " ^ func ^ ". ");
      print_string ("The next 10 tokens are:\n\t");
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      List.iter (print_genlex_token) tok_list ;
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      print_string ("\n");
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      flush stdout
    end 
  else ()
  

(** Parsing lists *)
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let rec
  (parse_list: (aut_token -> 'a) -> aut_token -> 'a list) = 
  fun parse tok -> 
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    let tok_list = Stream.npeek 10 tok in
      try
	match tok with parser  
            [< vnt = parse ; tail = (parse_list_var_tail (parse)) >]
	    -> vnt :: tail  
	  | [< >] -> [] (* empty list *)
	with e ->
	  print_err_msg tok_list "parse_list";
	  raise e
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and (parse_list_var_tail: (aut_token -> 'a) -> aut_token -> 'a list) = 
  fun parse tok -> 
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    let tok_list = Stream.npeek 10 tok in
      try
	match tok with parser 
	  | [< 'Genlex.Kwd ";" ; a = parse ;
	       tail = (parse_list_var_tail (parse)) >]
	    -> a :: tail  
	  | [< >] -> [] (* end of the list *)
	with e ->
	  print_err_msg tok_list "parse_list_var_tail";
	  raise e
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let rec (parse_automata: aut_token -> read_automata) = 
  fun tok -> 
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    let tok_list = Stream.npeek 20 tok in
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      try
	match tok with parser  
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	    [< 'Genlex.Ident "start"; 'Genlex.Ident "node"; 'Genlex.Kwd "="; 
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	       'Genlex.Int node_id ; 'Genlex.Kwd "," ;
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	       'Genlex.Ident "input"; 'Genlex.Ident "vars"; 'Genlex.Kwd "="; 
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	       'Genlex.Kwd "[" ; li = parse_list_var ; 'Genlex.Kwd "]" ; 
	       'Genlex.Kwd "," ;
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	       'Genlex.Ident "output"; 'Genlex.Ident "vars"; 'Genlex.Kwd "="; 
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	       'Genlex.Kwd "[" ; lo = parse_list_var ; 'Genlex.Kwd "]" ; 
	       'Genlex.Kwd "," ;
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	       'Genlex.Ident "local"; 'Genlex.Ident "vars"; 'Genlex.Kwd "=";  
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	       'Genlex.Kwd "[" ; ll = parse_list_var ; 'Genlex.Kwd "]" ; 
	       'Genlex.Kwd "," ;
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	       'Genlex.Ident "pre"; 'Genlex.Ident "vars"; 'Genlex.Kwd "=";  
	       'Genlex.Kwd "[" ; lpre = parse_list_var ; 'Genlex.Kwd "]" ; 
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	       'Genlex.Kwd "," ;
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	       'Genlex.Ident "arcs"; 'Genlex.Kwd "="; 
	       'Genlex.Kwd "[" ; la = parse_list_arc ; 'Genlex.Kwd "]"
	    >]
            -> Automata(node_id, li, lo, ll, lpre, la)
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	with e ->
	  print_err_msg tok_list "parse_automata";
	  raise e
	    
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and (parse_list_var: aut_token -> vnt list) = 
  fun tok -> 
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    let tok_list = Stream.npeek 10 tok in
      try
	parse_list (parse_var) tok
      with e ->
	print_err_msg tok_list "parse_list_var" ;
	raise e
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and (parse_var: aut_token -> vnt) = 
  fun tok -> 
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    let tok_list = Stream.npeek 10 tok in
      try
	match tok with parser  
	    [< 'Genlex.Kwd "("; 'Genlex.Ident var; 'Genlex.Kwd ","; 
	       'Genlex.Ident typ ; 'Genlex.Kwd ")" >]
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	    -> 
	      ( match typ with
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		  "bool" -> (var, BoolT)
		    (* XXX Rajouter dans le format un moyen de prciser ces bornes *)
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		| "float" -> (var, FloatT(-.max_float, max_float))
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		| "int" -> (var, IntT(min_int, max_int))
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		| str -> failwith ("*** Bad type in .env: " ^ str )
	      )
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	with e ->
	  print_err_msg tok_list "parse_var" ;
	  raise e
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and (parse_list_arc: aut_token -> read_arc list) = 
  fun tok -> 
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    let tok_list = Stream.npeek 10 tok in
      try
	parse_list (parse_arc) tok
      with e ->
	print_err_msg tok_list "parse_list_arc" ;
	raise e
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and (parse_arc: aut_token -> read_arc) = 
  fun tok -> 
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    let tok_list = Stream.npeek 10 tok in
      try
	match tok with parser  
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	    [< 'Genlex.Kwd "("; 'Genlex.Int node_from ; 
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	       'Genlex.Kwd ","; arc_info = parse_arc_info ; 
	       'Genlex.Kwd "," ; 'Genlex.Int node_to ; 'Genlex.Kwd ")";  >]
	    -> Arc(node_from, arc_info, node_to)
	with e ->
	  print_err_msg tok_list "parse_arc" ;
	  raise e
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and (parse_arc_info: aut_token -> arc_info) = 
  fun tok -> 
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    let tok_list = Stream.npeek 10 tok in
      try
	match tok with parser  
	    [< 'Genlex.Int weigth ; 'Genlex.Kwd ":"; expr = parse_formula_eps >] 
	    -> (weigth, expr)
	with e ->
	  print_err_msg tok_list "parse_arc_info" ;
	  raise e
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and (parse_formula_eps: aut_token -> formula_eps) = 
  fun tok -> 
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    let tok_list = Stream.npeek 10 tok in
      try
	match tok with parser   
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	    [< 'Genlex.Ident "eps" >] -> Eps
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	  | [< f = parse_formula >] -> Form(f)
	with e ->
	  print_err_msg tok_list "parse_formula_eps" ;
	  raise e
	    
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and (parse_formula: aut_token -> formula) = 
  fun tok -> 
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    let tok_list = Stream.npeek 10 tok in
      try
	match tok with parser  
	    [< 'Genlex.Kwd "Not"; f1 = parse_formula ; 
	       f = parse_more_formula (Not(f1)) >] -> f  
	  | [< 'Genlex.Kwd "("; f1 = parse_formula; 'Genlex.Kwd ")" ; 
	       f = parse_more_formula f1 >] -> f 
	  | [< 'Genlex.Kwd "true" ; f = parse_more_formula True >] -> f
	  | [< 'Genlex.Kwd "false" ; f = parse_more_formula False >] -> f
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	  | [< 'Genlex.Ident id ; f1 = parse_expr_or_bool_ident id ; 
	       f = parse_more_formula f1>] -> f
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	  | [< e1 = parse_expr; f1 = parse_expr_right e1 ; 
	       f = parse_more_formula f1 >] -> f
	with e ->
	  print_err_msg tok_list "parse_formula" ;
	  raise e
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and (parse_expr_or_bool_ident: string -> aut_token -> formula) = 
  fun id tok -> 
    let tok_list = Stream.npeek 10 tok in
      try
	match tok with parser  
	    [< 'Genlex.Kwd "=";  e2 = parse_expr >] -> Eq(Nvar(id), e2) 
	  | [< 'Genlex.Kwd ">";  e2 = parse_expr >] -> Sup(Nvar(id), e2) 
	  | [< 'Genlex.Kwd ">="; e2 = parse_expr >] -> SupEq(Nvar(id), e2)
	  | [< 'Genlex.Kwd "<";  e2 = parse_expr >] -> Inf(Nvar(id), e2) 
	  | [< 'Genlex.Kwd "<="; e2 = parse_expr >] -> InfEq(Nvar(id), e2)
	  | [< f = parse_more_formula (Bvar(id)) >] -> f 
	with e ->
	  print_err_msg tok_list "parse_expr_or_bool_ident" ;
	  raise e

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and (parse_more_formula: formula -> aut_token -> formula) = 
  fun f1 tok -> 
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    let tok_list = Stream.npeek 10 tok in
      try
	match tok with parser  
	    [< 'Genlex.Kwd "Or";  f2 = parse_formula >] -> Or(f1, f2)
	  | [< 'Genlex.Kwd "And"; f2 = parse_formula >] -> And(f1, f2) 
	  | [< >] -> f1
	with e ->
	  print_err_msg tok_list "parse_more_formula" ;
	  raise e
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and (parse_expr_right : expr -> aut_token -> formula) = 
  fun e1 tok -> 
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    let tok_list = Stream.npeek 10 tok in
      try
	match tok with parser
	    [< 'Genlex.Kwd "=";  e2 = parse_expr >] -> Eq(e1, e2) 
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	  | [< 'Genlex.Kwd ">";  e2 = parse_expr >] -> Sup(e1, e2) 
	  | [< 'Genlex.Kwd ">="; e2 = parse_expr >] -> SupEq(e1, e2)
	  | [< 'Genlex.Kwd "<";  e2 = parse_expr >] -> Inf(e1, e2) 
	  | [< 'Genlex.Kwd "<="; e2 = parse_expr >] -> InfEq(e1, e2)
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	with e ->
	  print_err_msg tok_list "parse_expr_rigth" ;
	  raise e
	    
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(* 
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 ** The following is copy-paste-adapted from sec 1.8 of the ocaml ref man 
 ** untitled ``pretty printing and parsing''.
 *)
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and (parse_expr: aut_token -> expr) = 
  fun tok -> 
    match tok with parser  
	[< e1 = parse_mult; e = parse_more_adds e1 >] -> e
and (parse_more_adds: expr -> aut_token -> expr) = 
  fun e1 tok -> 
    match tok with parser  
	[< 'Genlex.Kwd "+"; e2 = parse_mult; 
	   e = parse_more_adds (Sum(e1, e2)) >] -> e
      | [< 'Genlex.Kwd "-"; e2 = parse_mult; 
	   e = parse_more_adds (Diff(e1, e2)) >] -> e
      | [<  >] -> e1
and (parse_mult: aut_token -> expr) = 
  fun tok -> 
    match tok with parser  
	[< e1 = parse_simple; e = parse_more_mults e1 >] -> e
and (parse_more_mults: expr -> aut_token -> expr) = 
  fun e1 tok -> 
    match tok with parser  
	[< 'Genlex.Kwd "*";   e2 = parse_simple; 
	   e = parse_more_mults (Prod(e1, e2)) >] -> e
      | [< 'Genlex.Kwd "/";   e2 = parse_simple; 
	   e = parse_more_mults (Quot(e1, e2)) >] -> e
      | [< 'Genlex.Kwd "mod"; e2 = parse_simple; 
	   e = parse_more_mults (Mod(e1, e2)) >] -> e
      | [<  >] -> e1
and (parse_simple: aut_token -> expr) = 
  fun tok -> 
    match tok with parser  
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	[< 'Genlex.Ident s >] -> Nvar(s)
      | [< 'Genlex.Int i >]   -> Ival(i)
      | [< 'Genlex.Float f >] -> Fval(f)
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      | [< 'Genlex.Kwd "("; e = parse_expr; 'Genlex.Kwd ")" >] -> e