parse_env.ml 6.45 KB
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(*-----------------------------------------------------------------------
** Copyright (C) 2001 - Verimag.
** 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
**
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** Implements a .env parser, which format is described in XXX
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*)

open Formula

  
type read_arc = Arc of node * arc_info * node

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

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

type aut_token = Genlex.token Stream.t

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(* 
** Parsing lists 
*)
let rec
  (parse_list: (aut_token -> 'a) -> aut_token -> 'a list) = 
  fun parse tok -> 
    match tok with parser  
        [< vnt = parse ; tail = (parse_list_var_tail (parse)) >]  
	-> vnt :: tail  
      | [< >] -> [] (* empty list *)
and (parse_list_var_tail: (aut_token -> 'a) -> aut_token -> 'a list) = 
  fun parse tok -> 
    match tok with parser 
      | [< 'Genlex.Kwd ";" ; a = parse ;
	   tail = (parse_list_var_tail (parse)) >]
	-> a :: tail  
      | [< >] -> [] (* end of the list *)



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let rec (parse_automata: aut_token -> read_automata) = 
  fun tok -> 
    match tok with parser  
	[< 'Genlex.Kwd "automata" ;
	   'Genlex.Kwd "(" ; 
	   'Genlex.Int node_id ; 'Genlex.Kwd "," ;
	   'Genlex.Kwd "[" ; li = parse_list_var ; 'Genlex.Kwd "]" ; 
	   'Genlex.Kwd "," ;
	   'Genlex.Kwd "[" ; lo = parse_list_var ; 'Genlex.Kwd "]" ; 
	   'Genlex.Kwd "," ;
	   'Genlex.Kwd "[" ; ll = parse_list_var ; 'Genlex.Kwd "]" ; 
	   'Genlex.Kwd "," ;
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	   'Genlex.Kwd "[" ; lpe = parse_list_pre_expr ; 'Genlex.Kwd "]" ; 
	   'Genlex.Kwd "," ;
	   'Genlex.Kwd "[" ; lpf = parse_list_pre_form ; 'Genlex.Kwd "]" ; 
	   'Genlex.Kwd "," ;
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	   'Genlex.Kwd "[" ; la = parse_list_arc ; 'Genlex.Kwd "]" ;
	   'Genlex.Kwd ")" >] 
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        -> Automata(node_id, li, lo, ll, lpe, lpf, la)
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and (parse_list_var: aut_token -> vnt list) = 
  fun tok -> 
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    parse_list (parse_var) tok
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and (parse_var: aut_token -> vnt) = 
  fun tok -> 
    match tok with parser  
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	[< 'Genlex.Kwd "("; 'Genlex.Ident var; 'Genlex.Kwd ","; 
	   'Genlex.Ident typ ; 'Genlex.Kwd ")" >]
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	-> (var, typ)

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and (parse_list_pre_expr: aut_token -> vne list) = 
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  fun tok -> 
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    parse_list (parse_pre_expr) tok
and (parse_pre_expr: aut_token -> vne) = 
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  fun tok -> 
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    match tok with parser  
	[< 'Genlex.Kwd "("; 'Genlex.Ident var; 'Genlex.Kwd ","; 
	    e = parse_expr ; 'Genlex.Kwd ","; init = parse_expr ; 'Genlex.Kwd ")" >]
	-> (var, (e, init))

and (parse_list_pre_form: aut_token -> vnf list) = 
  fun tok -> 
    parse_list (parse_pre_form) tok
and (parse_pre_form: aut_token -> vnf) = 
  fun tok -> 
    match tok with parser  
	[< 'Genlex.Kwd "("; 'Genlex.Ident var; 'Genlex.Kwd ","; 
	    f = parse_formula ; 'Genlex.Kwd ","; init = parse_formula; 'Genlex.Kwd ")" >]
	-> (var, (f, init))


and (parse_list_arc: aut_token -> read_arc list) = 
  fun tok -> 
    parse_list (parse_arc) tok
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and (parse_arc: aut_token -> read_arc) = 
  fun tok -> 
    match tok with parser  
	[< 'Genlex.Kwd "arc"; 'Genlex.Kwd "("; 'Genlex.Int node_from ; 
	   'Genlex.Kwd ","; arc_info = parse_arc_info ; 
	   'Genlex.Kwd "," ; 'Genlex.Int node_to ; 'Genlex.Kwd ")";  >]
	-> Arc(node_from, arc_info, node_to)
and (parse_arc_info: aut_token -> arc_info) = 
  fun tok -> 
    match tok with parser  
	[< 'Genlex.Int weigth ; 'Genlex.Kwd ":"; expr = parse_formula_eps >] 
	-> (weigth, expr)

and (parse_formula_eps: aut_token -> formula_eps) = 
  fun tok -> 
    match tok with parser   
	[< 'Genlex.Kwd "eps" >] -> Eps
      | [< f = parse_formula >] -> Form(f)
	  
and (parse_formula: aut_token -> formula) = 
  fun tok -> 
    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 b ; f = parse_more_formula (Bvar(b)) >] -> f
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      | [< e1 = parse_expr; f1 = parse_expr_right e1 ; 
	   f = parse_more_formula f1 >] -> f

and (parse_more_formula: formula -> aut_token -> formula) = 
  fun f1 tok -> 
    match tok with parser  
	[< 'Genlex.Kwd "Or";  f2 = parse_formula >] -> Or(f1, f2)
      | [< 'Genlex.Kwd "And"; f2 = parse_formula >] -> And(f1, f2) 
      | [< >] -> f1
and (parse_expr_right : expr -> aut_token -> formula) = 
  fun e1 tok -> 
    match tok with parser
	[< 'Genlex.Kwd "=";  e2 = parse_expr >] -> Eq(e1, e2) 
      | [< 'Genlex.Kwd ">";  e2 = parse_expr >] -> G(e1, e2) 
      | [< 'Genlex.Kwd ">="; e2 = parse_expr >] -> Ge(e1, e2)
 

(* 
** The following is copy-paste-adapted from sec 1.8 of the ocaml ref man 
** untitled ``pretty printing and parsing''.
*)
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