merge ltlvisit/ ltlast/ ltlenv/ into a single tl/ directory

The ltl prefix does not make a lot of sens anymore (since we
support psl as well).  ltlast/ and ltlenv/ were almost empty.
And ltlvisit/ did not contain any visitor anymore.

* src/ltlvisit/, src/ltlast/, src/ltlenv/: Merge into...
* src/tl/: ...this.
* NEWS: Mention the change.
* README, bench/stutter/stutter_invariance_formulas.cc,
bench/stutter/stutter_invariance_randomgraph.cc, configure.ac,
doc/org/tut01.org, doc/org/tut02.org, doc/org/tut10.org, doc/tl/tl.tex,
iface/ltsmin/ltsmin.hh, iface/ltsmin/modelcheck.cc, src/Makefile.am,
src/bin/autfilt.cc, src/bin/common_output.cc, src/bin/common_output.hh,
src/bin/common_r.hh, src/bin/common_trans.cc, src/bin/genltl.cc,
src/bin/ltl2tgba.cc, src/bin/ltl2tgta.cc, src/bin/ltlcross.cc,
src/bin/ltldo.cc, src/bin/ltlfilt.cc, src/bin/ltlgrind.cc,
src/bin/randltl.cc, src/kripke/kripkeexplicit.hh,
src/kripkeparse/public.hh, src/parseaut/public.hh, src/priv/accmap.hh,
src/ta/taexplicit.hh, src/ta/tgtaexplicit.hh, src/tests/equalsf.cc,
src/tests/ikwiad.cc, src/tests/length.cc, src/tests/ltlrel.cc,
src/tests/randtgba.cc, src/tests/readltl.cc, src/tests/reduc.cc,
src/tests/syntimpl.cc, src/tests/taatgba.cc, src/tests/tostring.cc,
src/tests/twagraph.cc, src/twa/acc.hh, src/twa/bdddict.cc,
src/twa/bdddict.hh, src/twa/bddprint.cc, src/twa/taatgba.cc,
src/twa/taatgba.hh, src/twa/twa.hh, src/twa/twagraph.cc,
src/twa/twagraph.hh, src/twa/twasafracomplement.cc,
src/twaalgos/compsusp.cc, src/twaalgos/compsusp.hh,
src/twaalgos/dtgbasat.cc, src/twaalgos/hoa.cc,
src/twaalgos/isweakscc.cc, src/twaalgos/lbtt.cc,
src/twaalgos/ltl2taa.cc, src/twaalgos/ltl2taa.hh,
src/twaalgos/ltl2tgba_fm.cc, src/twaalgos/ltl2tgba_fm.hh,
src/twaalgos/minimize.hh, src/twaalgos/neverclaim.cc,
src/twaalgos/randomgraph.hh, src/twaalgos/relabel.hh,
src/twaalgos/remprop.hh, src/twaalgos/stats.cc, src/twaalgos/stutter.cc,
src/twaalgos/translate.hh, wrap/python/spot_impl.i,
src/ltlparse/ltlparse.yy, src/ltlparse/public.hh: Adjust.

src/tl/contain.cc

@@ -0,0 +1,140 @@
+// -*- coding: utf-8 -*-
+// Copyright (C) 2009, 2010, 2011, 2012, 2014, 2015 Laboratoire de
+// Recherche et Développement de l'Epita (LRDE).
+// Copyright (C) 2006, 2007 Laboratoire d'Informatique de Paris 6 (LIP6),
+// département Systèmes Répartis Coopératifs (SRC), Université Pierre
+// et Marie Curie.
+//
+// This file is part of Spot, a model checking library.
+//
+// Spot is free software; you can redistribute it and/or modify it
+// under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 3 of the License, or
+// (at your option) any later version.
+//
+// Spot is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+// or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
+// License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+#include "contain.hh"
+#include "simplify.hh"
+#include "formula.hh"
+#include "twaalgos/product.hh"
+
+namespace spot
+{
+  namespace ltl
+  {
+
+    language_containment_checker::language_containment_checker
+      (const bdd_dict_ptr& dict, bool exprop, bool symb_merge,
+       bool branching_postponement, bool fair_loop_approx)
+      : dict_(dict), exprop_(exprop), symb_merge_(symb_merge),
+      branching_postponement_(branching_postponement),
+      fair_loop_approx_(fair_loop_approx)
+    {
+    }
+
+    language_containment_checker::~language_containment_checker()
+    {
+      clear();
+    }
+
+    void
+    language_containment_checker::clear()
+    {
+      translated_.clear();
+    }
+
+    bool
+    language_containment_checker::incompatible_(record_* l, record_* g)
+    {
+      record_::incomp_map::const_iterator i = l->incompatible.find(g);
+      if (i != l->incompatible.end())
+	return i->second;
+
+      bool res = product(l->translation, g->translation)->is_empty();
+      l->incompatible[g] = res;
+      g->incompatible[l] = res;
+      return res;
+    }
+
+
+    // Check whether L(l) is a subset of L(g).
+    bool
+    language_containment_checker::contained(formula l,
+					    formula g)
+    {
+      if (l == g)
+	return true;
+      record_* rl = register_formula_(l);
+      record_* rng = register_formula_(formula::Not(g));
+      return incompatible_(rl, rng);
+    }
+
+    // Check whether L(!l) is a subset of L(g).
+    bool
+    language_containment_checker::neg_contained(formula l,
+						formula g)
+    {
+      if (l == g)
+	return false;
+      formula nl = formula::Not(l);
+      record_* rnl = register_formula_(nl);
+      record_* rng = register_formula_(formula::Not(g));
+      if (nl == g)
+	return true;
+      return incompatible_(rnl, rng);
+    }
+
+    // Check whether L(l) is a subset of L(!g).
+    bool
+    language_containment_checker::contained_neg(formula l,
+						formula g)
+    {
+      if (l == g)
+	return false;
+      record_* rl = register_formula_(l);
+      record_* rg = register_formula_(g);
+      return incompatible_(rl, rg);
+    }
+
+    // Check whether L(l) = L(g).
+    bool
+    language_containment_checker::equal(formula l, formula g)
+    {
+      return contained(l, g) && contained(g, l);
+    }
+
+    language_containment_checker::record_*
+    language_containment_checker::register_formula_(formula f)
+    {
+      trans_map::iterator i = translated_.find(f);
+      if (i != translated_.end())
+	return &i->second;
+
+      auto e = ltl_to_tgba_fm(f, dict_, exprop_, symb_merge_,
+			      branching_postponement_, fair_loop_approx_);
+      record_& r = translated_[f];
+      r.translation = e;
+      return &r;
+    }
+
+
+    formula
+    reduce_tau03(formula f, bool stronger)
+    {
+      if (!f.is_psl_formula())
+	return f;
+
+      ltl_simplifier_options opt(false, false, false,
+				 true, stronger);
+      ltl_simplifier simpl(opt);
+      return simpl.simplify(f);
+    }
+  }
+}