python: better interface for sat_minimize()

* NEWS: Mention it.
* wrap/python/spot.py: Rewrite the sat_minimize() function.
* wrap/python/tests/satmin.py: New file.
* wrap/python/tests/Makefile.am (TESTS): Add it.

NEWS

@@ -66,6 +66,7 @@ New in spot 1.99.5a (not yet released)
 
   Python:
   * Add bindings for is_unambiguous().
+  * Better interface for sat_minimize().
 
   Bug fixes:
   * automaton parser was ignoring the "unambiguous" property.

wrap/python/spot.py

@@ -846,3 +846,29 @@ for fun in dir(formula):
 for fun in ['remove_x', 'relabel', 'relabel_bse',
             'simplify', 'unabbreviate']:
     _addmap(fun)
+
+
+
+# Better interface to the corresponding C++ function.
+def sat_minimize(aut, acc=None, colored=False,
+                 state_based=False, states=0,
+                 max_states=0, dichotomy=False):
+    args=''
+    if acc is not None:
+        if type(acc) is not str:
+            raise ValueError("argument 'acc' should be a string")
+        args += ',acc="' + acc + '"'
+    if colored:
+        args += ',colored'
+    if states:
+        if type(states) is not int or states < 0:
+            raise ValueError("argument 'states' should be a positive integer")
+        args += ',states=' + str(states)
+    if max_states:
+        if type(max_states) is not int or max_states < 0:
+            raise ValueError("argument 'states' should be a positive integer")
+        args += ',max-states=' + str(max_states)
+    if dichotomy:
+        args += ',dichotomy';
+    from spot_impl import sat_minimize as sm
+    return sm(aut, args, state_based)

wrap/python/tests/Makefile.am

@@ -53,6 +53,7 @@ TESTS = \
   randltl.ipynb \
   relabel.py \
   remfin.py \
+  satmin.py \
   setxor.py \
   testingaut.ipynb
 

wrap/python/tests/satmin.py

@@ -0,0 +1,49 @@
+# -*- mode: python; coding: utf-8 -*-
+# Copyright (C) 2015  Laboratoire de Recherche et Développement
+# de l'Epita
+#
+# 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/>.
+
+import shutil
+import sys
+import spot
+
+# Ignore the test if glucose is not installed.
+if shutil.which("glucose") == None:
+    sys.exit(77)
+
+aut = spot.translate('GFa & GFb', 'BA')
+assert aut.num_sets() == 1
+assert aut.num_states() == 3
+assert aut.is_deterministic()
+
+min1 = spot.sat_minimize(aut, acc='Rabin 1')
+assert min1.num_sets() == 2
+assert min1.num_states() == 2
+
+min2 = spot.sat_minimize(aut, acc='Streett 2', dichotomy=True)
+assert min2.num_sets() == 4
+assert min2.num_states() == 1
+
+min3 = spot.sat_minimize(aut, acc='Rabin 2',
+                         state_based=True, max_states=5, dichotomy=True)
+assert min3.num_sets() == 4
+assert min3.num_states() == 3
+
+min4 = spot.sat_minimize(aut, acc='parity max odd 3',
+                         colored=True, dichotomy=True)
+assert min4.num_sets() == 3
+assert min4.num_states() == 2