parseaut: keep track of the format of each parsed automaton

* src/parseaut/public.hh (parsed_aut): Add a type field.
* src/parseaut/parseaut.yy: Fill it.
* src/dstarparse/dstarparse.yy: Use this field instead of
the private enumeration.

src/dstarparse/dstarparse.yy

@@ -38,12 +38,9 @@
   {
     typedef std::map<int, bdd> map_t;
 
-    enum dstar_type { Rabin, Streett };
-
     struct result_
     {
       spot::parsed_aut_ptr d;
-      dstar_type type;
       spot::ltl::environment* env;
       std::vector<bdd> guards;
       std::vector<bdd>::const_iterator cur_guard;
@@ -128,13 +125,13 @@ opt_eols: | opt_eols EOL
 
 auttype: DRA
        {
-         result.type = Rabin;
+         result.d->type = spot::parsed_aut_type::DRA;
          result.plus = 1;
          result.minus = 0;
        }
        | DSA
        {
-	 result.type = Streett;
+	 result.d->type = spot::parsed_aut_type::DSA;
          result.plus = 0;
          result.minus = 1;
        }
@@ -189,9 +186,9 @@ sizes:
     result.accpair_count = $4;
     result.accpair_count_seen = true;
     result.d->aut->set_acceptance(2 * $4,
-				  result.type == Rabin ?
-				  spot::acc_cond::acc_code::rabin($4) :
-				  spot::acc_cond::acc_code::streett($4));
+				  result.d->type == spot::parsed_aut_type::DRA
+				  ? spot::acc_cond::acc_code::rabin($4)
+				  : spot::acc_cond::acc_code::streett($4));
   }
   | sizes STATES opt_eols NUMBER opt_eols
   {

src/parseaut/parseaut.yy

@@ -246,10 +246,9 @@ aut: aut-1     { res.h->loc = @$; YYACCEPT; }
    | ENDOFFILE { YYABORT; }
    | error ENDOFFILE { YYABORT; }
 
-aut-1: hoa
-     | never
-     | lbtt
-
+aut-1: hoa    { res.h->type = spot::parsed_aut_type::HOA; }
+     | never  { res.h->type = spot::parsed_aut_type::NeverClaim; }
+     | lbtt   { res.h->type = spot::parsed_aut_type::LBTT; }
 
 /**********************************************************************/
 /*                          Rules for HOA                             */

src/parseaut/public.hh

@@ -43,6 +43,8 @@ namespace spot
   struct parse_aut_error_list {};
 #endif
 
+  enum class parsed_aut_type { HOA, NeverClaim, LBTT, DRA, DSA, Unknown };
+
   /// \brief Temporary encoding of an omega automaton produced by
   /// the parser.
   struct SPOT_API parsed_aut
@@ -52,6 +54,7 @@ namespace spot
     twa_graph_ptr aut;
     bool aborted = false;
     spot::location loc;
+    parsed_aut_type type = parsed_aut_type::Unknown;
   };
 
   typedef std::shared_ptr<parsed_aut> parsed_aut_ptr;