python: better support for explicit Kripke

Part of issue #376, reported by Hashim Ali.

* python/spot/impl.i: Add bindings for kripke_graph.
* python/spot/__init__.py (automaton): Add a want_kripke option.
* spot/kripke/kripkegraph.hh: Honnor the "state-names" property
when displaying states.
* spot/twaalgos/hoa.cc: Preserve names of Kripke states.
* tests/python/ltsmin-dve.ipynb: Illustrate all the above.
* NEWS: Mention those changes.
* THANKS: Add Hashim.

NEWS

@@ -4,7 +4,7 @@ New in spot 2.7.0.dev (not yet release)
 
   - Work around GCC bug #89303, that causes memory leaks and std::weak_bad_ptr
     exceptions when Spot is compiled with the version of g++ 8.2 currently
-    distributed with Debian (starting with 8.2.0-15).
+    distributed by Debian unstable (starting with g++ 8.2.0-15).
 
   Python:
 
@@ -17,6 +17,20 @@ New in spot 2.7.0.dev (not yet release)
     - unregister_all_my_variables(for_me)
     - unregister_variable(var, for_me)
 
+  - Better support for explicit Kripke structures
+    - the kripke_graph type now has bindings
+    - spot.automaton() and spot.automata() now support a want_kripke=True
+      to return a kripke_graph
+      See the bottom of https://spot.lrde.epita.fr/ipynb/ltsmin-dve.html
+      for some examples.
+
+  Library:
+
+  - Printing Kripke structures via print_hoa() will save state names.
+
+  - kripke_graph_ptr objects now honnor any "state-names" property
+    when formating states.
+
   Bugs fixed:
 
   - The print_dot_psl() function would incorrectly number all but the
@@ -38,7 +52,7 @@ New in spot 2.7.0.dev (not yet release)
     suspendable automaton could incorrectly build transition-based
     automata when multipliying two state-based automata.  This caused
     ltl2tgba to emit error messages such as: "automaton has
-    transition-based acceptance despite prop_state_acc()==true"
+    transition-based acceptance despite prop_state_acc()==true".
 
 New in spot 2.7 (2018-12-11)
 

THANKS

@@ -17,6 +17,7 @@ Felix Klaedtke
 Florian Perlié-Long
 František Blahoudek
 Gerard J. Holzmann
+Hashim Ali
 Heikki Tauriainen
 Henrich Lauko
 Jan Strejček

python/spot/__init__.py

@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-# Copyright (C) 2014-2018  Laboratoire de
+# Copyright (C) 2014-2019  Laboratoire de
 # Recherche et Développement de l'Epita (LRDE).
 #
 # This file is part of Spot, a model checking library.
@@ -367,7 +367,8 @@ class atomic_prop_set:
 
 
 def automata(*sources, timeout=None, ignore_abort=True,
-             trust_hoa=True, no_sid=False, debug=False):
+             trust_hoa=True, no_sid=False, debug=False,
+             want_kripke=False):
     """Read automata from a list of sources.
 
     Parameters
@@ -386,6 +387,10 @@ def automata(*sources, timeout=None, ignore_abort=True,
     trust_hoa : bool, optional
         If True (the default), supported HOA properies that
         cannot be easily verified are trusted.
+    want_kripke : bool, optional
+        If True, the input is expected to discribe Kripke
+        structures, in the HOA format, and the returned type
+        will be of type kripke_graph_ptr.
     no_sid : bool, optional
         When an automaton is obtained from a subprocess, this
         subprocess is started from a shell with its own session
@@ -445,6 +450,8 @@ def automata(*sources, timeout=None, ignore_abort=True,
     o.ignore_abort = ignore_abort
     o.trust_hoa = trust_hoa
     o.raise_errors = True
+    o.want_kripke = want_kripke
+
     for filename in sources:
         try:
             p = None
@@ -496,8 +503,9 @@ def automata(*sources, timeout=None, ignore_abort=True,
             mgr = proc if proc else _supress()
             with mgr:
                 while a:
-                    # This returns None when we reach the end of the file.
+                    # the automaton is None when we reach the end of the file.
-                    a = p.parse(_bdd_dict).aut
+                    res = p.parse(_bdd_dict)
+                    a = res.ks if want_kripke else res.aut
                     if a:
                         yield a
         finally:

python/spot/impl.i

@@ -47,7 +47,6 @@
 %shared_ptr(spot::fair_kripke)
 %shared_ptr(spot::kripke)
 %shared_ptr(spot::kripke_graph)
-%shared_ptr(spot::kripke)
 %shared_ptr(spot::ta)
 %shared_ptr(spot::ta_explicit)
 %shared_ptr(spot::ta_product)
@@ -172,8 +171,9 @@
 
 #include <spot/parseaut/public.hh>
 
-#include <spot/kripke/kripke.hh>
 #include <spot/kripke/fairkripke.hh>
+#include <spot/kripke/kripke.hh>
+#include <spot/kripke/kripkegraph.hh>
 
 #include <spot/ta/ta.hh>
 #include <spot/ta/tgta.hh>
@@ -678,10 +678,11 @@ def state_is_accepting(self, src) -> "bool":
 
 %include <spot/twaalgos/complement.hh>
 
-%include <spot/parseaut/public.hh>
-
 %include <spot/kripke/fairkripke.hh>
 %include <spot/kripke/kripke.hh>
+%include <spot/kripke/kripkegraph.hh>
+
+%include <spot/parseaut/public.hh>
 
 %include <spot/ta/ta.hh>
 %include <spot/ta/tgta.hh>

spot/kripke/kripkegraph.hh

@@ -1,5 +1,5 @@
 // -*- coding: utf-8 -*-
-// Copyright (C) 2011-2018 Laboratoire de Recherche et Développement de
+// Copyright (C) 2011-2019 Laboratoire de Recherche et Développement de
 // l'Epita (LRDE)
 //
 // This file is part of Spot, a model checking library.
@@ -239,9 +239,11 @@ namespace spot
 
     std::string format_state(unsigned n) const
     {
-      std::stringstream ss;
+      auto named = get_named_prop<std::vector<std::string>>("state-names");
-      ss << n;
+      if (named && n < named->size())
-      return ss.str();
+        return (*named)[n];
+
+      return std::to_string(n);
     }
 
     virtual std::string format_state(const state* st) const override

spot/twaalgos/hoa.cc

@@ -1,5 +1,5 @@
 // -*- coding: utf-8 -*-
-// Copyright (C) 2014-2018 Laboratoire de Recherche et
+// Copyright (C) 2014-2019 Laboratoire de Recherche et
 // Developpement de l'Epita (LRDE).
 //
 // This file is part of Spot, a model checking library.
@@ -304,6 +304,9 @@ namespace spot
             case 'k':
               state_labels = true;
               break;
+            case 'K':
+              state_labels = false;
+              break;
             case 'l':
               newline = false;
               break;
@@ -732,14 +735,12 @@ namespace spot
             const const_twa_ptr& aut,
             const char* opt)
   {
-
+    bool preserve_names = false;
-    auto a = std::dynamic_pointer_cast<const twa_graph>(aut);
-    if (!a)
-      a = make_twa_graph(aut, twa::prop_set::all());
-
     // for Kripke structures, automatically append "k" to the options.
+    // (Unless "K" was given.)
     char* tmpopt = nullptr;
-    if (std::dynamic_pointer_cast<const fair_kripke>(aut))
+    if (std::dynamic_pointer_cast<const fair_kripke>(aut) &&
+        (!opt || (strchr(opt, 'K') == nullptr)))
       {
         unsigned n = opt ? strlen(opt) : 0;
         tmpopt = new char[n + 2];
@@ -747,7 +748,13 @@ namespace spot
           strcpy(tmpopt, opt);
         tmpopt[n] = 'k';
         tmpopt[n + 1] = 0;
+        preserve_names = true;
       }
+
+    auto a = std::dynamic_pointer_cast<const twa_graph>(aut);
+    if (!a)
+      a = make_twa_graph(aut, twa::prop_set::all(), preserve_names);
+
     print_hoa(os, a, tmpopt ? tmpopt : opt);
     delete[] tmpopt;
     return os;

tests/python/ltsmin-dve.ipynb

@@ -436,7 +436,7 @@
        "</svg>\n"
       ],
       "text/plain": [
-       "<spot.impl.kripke; proxy of <Swig Object of type 'std::shared_ptr< spot::kripke > *' at 0x7f0f044132a0> >"
+       "<spot.impl.kripke; proxy of <Swig Object of type 'std::shared_ptr< spot::kripke > *' at 0x7fb8f84f9870> >"
       ]
      },
      "execution_count": 9,
@@ -1265,7 +1265,7 @@
        "</svg>\n"
       ],
       "text/plain": [
-       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f0f04381d50> >"
+       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fb8f84691e0> >"
       ]
      },
      "execution_count": 12,
@@ -1453,7 +1453,7 @@
        "</svg>\n"
       ],
       "text/plain": [
-       "<spot.impl.twa_product; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_product > *' at 0x7f0f04381b10> >"
+       "<spot.impl.twa_product; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_product > *' at 0x7fb8f8469360> >"
       ]
      },
      "execution_count": 13,
@@ -1548,7 +1548,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 19,
+   "execution_count": 18,
    "metadata": {},
    "outputs": [
     {
@@ -1582,7 +1582,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 20,
+   "execution_count": 19,
    "metadata": {},
    "outputs": [
     {
@@ -1663,10 +1663,10 @@
        "</svg>\n"
       ],
       "text/plain": [
-       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f0f04392d80> >"
+       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fb8f85624e0> >"
       ]
      },
-     "execution_count": 20,
+     "execution_count": 19,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -1676,11 +1676,338 @@
    ]
   },
   {
-   "cell_type": "code",
+   "cell_type": "markdown",
-   "execution_count": null,
    "metadata": {},
-   "outputs": [],
+   "source": [
-   "source": []
+    "# Saving Kripke structures to some file\n",
+    "\n",
+    "For experiments, it is sometime useful to save a Kripke structure in the HOA format.  The HOA printer will automatically use `state-labels` for Kripke structures."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 20,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "HOA: v1\n",
+      "States: 22\n",
+      "Start: 0\n",
+      "AP: 3 \"a<1\" \"b>2\" \"dead\"\n",
+      "acc-name: all\n",
+      "Acceptance: 0 t\n",
+      "properties: state-labels explicit-labels state-acc\n",
+      "--BODY--\n",
+      "State: [0&!1&!2] 0 \"a=0, b=0, Q=0\"\n",
+      "1 2\n",
+      "State: [!0&!1&!2] 1 \"a=1, b=0, Q=0\"\n",
+      "3 4\n",
+      "State: [0&!1&!2] 2 \"a=0, b=1, Q=0\"\n",
+      "4 5\n",
+      "State: [!0&!1&!2] 3 \"a=2, b=0, Q=0\"\n",
+      "6 7\n",
+      "State: [!0&!1&!2] 4 \"a=1, b=1, Q=0\"\n",
+      "7 8\n",
+      "State: [0&!1&!2] 5 \"a=0, b=2, Q=0\"\n",
+      "8 9 10\n",
+      "State: [!0&!1&2] 6 \"a=3, b=0, Q=0\"\n",
+      "6\n",
+      "State: [!0&!1&!2] 7 \"a=2, b=1, Q=0\"\n",
+      "11 12\n",
+      "State: [!0&!1&!2] 8 \"a=1, b=2, Q=0\"\n",
+      "12 13 14\n",
+      "State: [0&1&!2] 9 \"a=0, b=3, Q=0\"\n",
+      "15\n",
+      "State: [0&!1&!2] 10 \"a=0, b=2, Q=1\"\n",
+      "14 15\n",
+      "State: [!0&!1&2] 11 \"a=3, b=1, Q=0\"\n",
+      "11\n",
+      "State: [!0&!1&!2] 12 \"a=2, b=2, Q=0\"\n",
+      "16 17 18\n",
+      "State: [!0&1&!2] 13 \"a=1, b=3, Q=0\"\n",
+      "19\n",
+      "State: [!0&!1&!2] 14 \"a=1, b=2, Q=1\"\n",
+      "18 19\n",
+      "State: [0&1&2] 15 \"a=0, b=3, Q=1\"\n",
+      "15\n",
+      "State: [!0&!1&!2] 16 \"a=3, b=2, Q=0\"\n",
+      "20\n",
+      "State: [!0&1&!2] 17 \"a=2, b=3, Q=0\"\n",
+      "21\n",
+      "State: [!0&!1&!2] 18 \"a=2, b=2, Q=1\"\n",
+      "20 21 12\n",
+      "State: [!0&1&2] 19 \"a=1, b=3, Q=1\"\n",
+      "19\n",
+      "State: [!0&!1&!2] 20 \"a=3, b=2, Q=1\"\n",
+      "16\n",
+      "State: [!0&1&!2] 21 \"a=2, b=3, Q=1\"\n",
+      "17\n",
+      "--END--\n"
+     ]
+    }
+   ],
+   "source": [
+    "string = k.to_str('hoa')\n",
+    "print(string)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "You can load this as a Kripke structure by passing the `want_kripke` option to `spot.automaton()`.  The type `kripke_graph` stores the Kripke structure explicitely (like a `twa_graph` stores an automaton explicitely), so you may want to avoid it for very large modelsand use it only for development."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 21,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "<class 'spot.impl.kripke_graph'>\n"
+     ]
+    },
+    {
+     "data": {
+      "image/svg+xml": [
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+       "</g>\n",
+       "<!-- I&#45;&gt;0 -->\n",
+       "<g id=\"edge1\" class=\"edge\">\n",
+       "<title>I&#45;&gt;0</title>\n",
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+       "<!-- 0&#45;&gt;1 -->\n",
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+       "<title>9&#45;&gt;u9</title>\n",
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+       "</g>\n",
+       "</g>\n",
+       "</svg>\n"
+      ],
+      "text/plain": [
+       "<spot.impl.kripke_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::kripke_graph > *' at 0x7fb8f84690f0> >"
+      ]
+     },
+     "execution_count": 21,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "k2 = spot.automaton(string, want_kripke=True)\n",
+    "print(type(k2))\n",
+    "k2"
+   ]
   }
  ],
  "metadata": {
@@ -1699,7 +2026,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.6.7"
+   "version": "3.7.2+"
   }
  },
  "nbformat": 4,