1 // -*- coding: utf-8 -*-
2 // Copyright (C) 2011, 2012, 2013, 2014, 2016 Laboratoire de Recherche
3 // et Développement de l'Epita (LRDE).
4 //
5 // This file is part of Spot, a model checking library.
6 //
7 // Spot is free software; you can redistribute it and/or modify it
8 // under the terms of the GNU General Public License as published by
9 // the Free Software Foundation; either version 3 of the License, or
10 // (at your option) any later version.
11 //
12 // Spot is distributed in the hope that it will be useful, but WITHOUT
13 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14 // or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
15 // License for more details.
16 //
17 // You should have received a copy of the GNU General Public License
18 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
19 
20 #pragma once
21 
22 #include <spot/twa/twa.hh>
23 #include <spot/twa/twaproduct.hh>
24 #include <spot/misc/fixpool.hh>
25 #include <spot/kripke/kripke.hh>
26 #include <spot/ta/tgta.hh>
27 
28 namespace spot
29 {
30 
31   /// \brief A lazy product.  (States are computed on the fly.)
32   class SPOT_API tgta_product : public twa_product
33   {
34   public:
35     tgta_product(const const_kripke_ptr& left,
36                  const const_tgta_ptr& right);
37 
38     virtual const state* get_init_state() const override;
39 
40     virtual twa_succ_iterator*
41     succ_iter(const state* local_state) const override;
42   };
43 
product(const const_kripke_ptr & left,const const_tgta_ptr & right)44   inline twa_ptr product(const const_kripke_ptr& left,
45                           const const_tgta_ptr& right)
46   {
47     return std::make_shared<tgta_product>(left, right);
48   }
49 
50   /// \brief Iterate over the successors of a product computed on the fly.
51   class SPOT_API tgta_succ_iterator_product final : public twa_succ_iterator
52   {
53   public:
54     tgta_succ_iterator_product(const state_product* s,
55                                const const_kripke_ptr& k,
56                                const const_tgta_ptr& tgta,
57                                fixed_size_pool<pool_type::Safe>* pool);
58 
59     virtual
60     ~tgta_succ_iterator_product();
61 
62     // iteration
63     bool first() override;
64     bool next() override;
65     bool done() const override;
66 
67     // inspection
68     state_product* dst() const override;
69     bdd cond() const override;
70     acc_cond::mark_t acc() const override;
71 
72   private:
73     //@{
74     /// Internal routines to advance to the next successor.
75     void
76     step_();
77     bool find_next_succ_();
78 
79     void
80     next_kripke_dest();
81 
82     //@}
83 
84   protected:
85     const state_product* source_;
86     const_tgta_ptr tgta_;
87     const_kripke_ptr kripke_;
88     fixed_size_pool<pool_type::Safe>* pool_;
89     twa_succ_iterator* tgta_succ_it_;
90     twa_succ_iterator* kripke_succ_it_;
91     state_product* current_state_;
92     bdd current_condition_;
93     acc_cond::mark_t current_acceptance_conditions_;
94     bdd kripke_source_condition;
95     const state* kripke_current_dest_state;
96   };
97 }
98