Initial code for TGBA (Transition Generalized B�chi Automata).

Contains tgba_bdd, a BDD-encoded TGBA, and ltl_to_tgba,
a LTL-to-TGBA translator using Couvreur's algorithm.

* src/Makefile.am (SUBDIRS): Add tgba.
(libspot_la_LIBADD): Add tgba/libtgba.la.
* src/tgba/Makefile.am, src/tgba/bddfactory.cc,
src/tgba/bddfactory.hh, src/tgba/dictunion.cc,
src/tgba/dictunion.hh, src/tgba/ltl2tgba.cc, src/tgba/ltl2tgba.hh,
src/tgba/state.hh, src/tgba/statebdd.cc, src/tgba/statebdd.hh,
src/tgba/succiter.hh, src/tgba/succiterconcrete.cc,
src/tgba/succiterconcrete.hh, src/tgba/succlist.hh,
src/tgba/tgba.hh, src/tgba/tgbabddconcrete.cc,
src/tgba/tgbabddconcrete.hh, src/tgba/tgbabddconcretefactory.cc,
src/tgba/tgbabddconcretefactory.hh,
src/tgba/tgbabddconcreteproduct.cc,
src/tgba/tgbabddconcreteproduct.hh, src/tgba/tgbabddcoredata.cc,
src/tgba/tgbabddcoredata.hh, src/tgba/tgbabdddict.cc,
src/tgba/tgbabdddict.hh, src/tgba/tgbabddfactory.hh,
src/tgba/tgbabddtranslatefactory.cc,
src/tgba/tgbabddtranslatefactory.hh: New files.

src/tgba/succiterconcrete.cc

@@ -0,0 +1,64 @@
+#include "succiterconcrete.hh"
+
+namespace spot
+{
+  tgba_succ_iterator_concrete::tgba_succ_iterator_concrete
+  (const tgba_bdd_core_data& d, bdd successors)
+    : data_(d), succ_set_(successors), next_succ_set_(successors),
+      current_(bddfalse)
+  {
+  }
+  
+  tgba_succ_iterator_concrete::~tgba_succ_iterator_concrete()
+  {
+  }
+  
+  void
+  tgba_succ_iterator_concrete::first()
+  {
+    next_succ_set_ = succ_set_;
+    if (!done())
+      next();
+  }
+  
+  void
+  tgba_succ_iterator_concrete::next()
+  {
+    assert(!done());
+  
+    // FIXME: Iterating on the successors this way (calling bdd_satone
+    // and NANDing out the result from the set) requires several descent
+    // of the BDD.  Maybe it would be faster to compute all satisfying
+    // formula in one operation.
+    next_succ_set_ &= !current_;
+    current_ = bdd_satone(next_succ_set_);
+  }
+  
+  bool
+  tgba_succ_iterator_concrete::done()
+  {
+    return next_succ_set_ == bddfalse;
+  }
+  
+  state_bdd
+  tgba_succ_iterator_concrete::current_state()
+  {
+    assert(!done());
+    return bdd_exist(current_, data_.notnow_set);
+  }
+  
+  bdd
+  tgba_succ_iterator_concrete::current_condition()
+  {
+    assert(!done());
+    return bdd_exist(current_, data_.notvar_set);
+  }
+  
+  bdd
+  tgba_succ_iterator_concrete::current_promise()
+  {
+    assert(!done());
+    return bdd_exist(current_, data_.notprom_set);
+  }
+
+}