bin: add --check=unambiguous

* src/bin/common_aoutput.cc: Add --check=unambiguous.
* src/twa/twa.hh: New unambiguous property.
* src/twaalgos/hoa.cc: Print it.
* src/twaalgos/ltl2tgba_fm.cc: Set it.
* src/twaalgos/isunamb.cc, src/twaalgos/isunamb.hh
(check_unambiguous): New function.
* src/tests/unambig.test: More tests.

src/twaalgos/hoa.cc

@@ -296,7 +296,6 @@ namespace spot
     os << aut->acc().get_acceptance();
     os << nl;
     os << "properties:";
-
     // Make sure the property line is not too large,
     // otherwise our test cases do not fit in 80 columns...
     unsigned prop_len = 60;
@@ -327,6 +326,8 @@ namespace spot
       prop(" complete");
     if (md.is_deterministic)
       prop(" deterministic");
+    if (aut->is_unambiguous())
+      prop(" unambiguous");
     assert(!(aut->is_stutter_invariant() && aut->is_stutter_sensitive()));
     if (aut->is_stutter_invariant())
       prop(" stutter-invariant");

src/twaalgos/isunamb.cc

@@ -28,7 +28,7 @@ namespace spot
 {
   bool is_unambiguous(const const_twa_graph_ptr& aut)
   {
-    if (aut->is_deterministic())
+    if (aut->is_deterministic() || aut->is_unambiguous())
       return true;
     auto clean_a = scc_filter_states(aut);
     auto prod = product(clean_a, clean_a);
@@ -37,4 +37,10 @@ namespace spot
     tgba_statistics sp = stats_reachable(clean_p);
     return sa.states == sp.states && sa.transitions == sp.transitions;
   }
+
+  bool check_unambiguous(const twa_graph_ptr& aut)
+  {
+    aut->prop_unambiguous(is_unambiguous(aut));
+    return aut->is_unambiguous();
+  }
 }

src/twaalgos/isunamb.hh

@@ -25,7 +25,7 @@ namespace spot
 {
   class tgba;
 
-  /// \addtogroup tgba_misc
+  /// \addtogroup twa_misc
   /// @{
 
   /// \brief Whether the automaton \a aut is unambiguous.
@@ -40,5 +40,8 @@ namespace spot
   SPOT_API bool
   is_unambiguous(const const_twa_graph_ptr& aut);
 
+  /// Like is_unambiguous(), but also sets the property in the twa.
+  SPOT_API bool
+  check_unambiguous(const twa_graph_ptr& aut);
   /// @}
 }

src/twaalgos/ltl2tgba_fm.cc

@@ -2555,6 +2555,9 @@ namespace spot
     a->prop_inherently_weak(f->is_syntactic_persistence());
     a->prop_stutter_invariant(f->is_syntactic_stutter_invariant());
 
+    // Currently the unambiguous option work only with LTL.
+    a->prop_unambiguous(f->is_ltl_formula() && unambiguous);
+
     if (!simplifier)
       // This should not be deleted before we have registered all propositions.
       delete s;