src/sage/features/sat.py: New

Author: Matthias Koeppe

src/sage/features/sat.py

@@ -0,0 +1,80 @@
+# sage_setup: distribution = sagemath-environment
+r"""
+Feature for testing the presence of SAT solvers
+"""
+
+from . import Executable, PythonModule
+
+
+class Glucose(Executable):
+    r"""
+    A :class:`~sage.features.Feature` describing the presence of an
+    executable from the :ref:`Glucose SAT solver <spkg_glucose>`.
+
+    EXAMPLES::
+
+        sage: from sage.features.sat import Glucose
+        sage: GlucoseExecutable().is_present()                  # optional - glucose
+        FeatureTestResult('glucose', True)
+    """
+    def __init__(self, executable="glucose"):
+        r"""
+        TESTS::
+
+            sage: from sage.features.sat import Glucose
+            sage: isinstance(Glucose(), Glucose)
+            True
+        """
+        Executable.__init__(self, name=executable, executable=executable,
+                            spkg="glucose", type="optional")
+
+
+class Kissat(Executable):
+    r"""
+    A :class:`~sage.features.Feature` describing the presence of the
+    :ref:`Kissat SAT solver <spkg_kissat>`.
+
+    EXAMPLES::
+
+        sage: from sage.features.sat import Kissat
+        sage: Kissat().is_present()                             # optional - kissat
+        FeatureTestResult('kissat', True)
+    """
+    def __init__(self):
+        r"""
+        TESTS::
+
+            sage: from sage.features.sat import Kissat
+            sage: isinstance(Kissat(), Kissat)
+            True
+        """
+        Executable.__init__(self, name="kissat", executable="kissat",
+                            spkg="kissat", type="optional")
+
+
+class Pycosat(PythonModule):
+    r"""
+    A :class:`~sage.features.Feature` describing the presence of :ref:`spkg_pycosat`.
+
+    EXAMPLES::
+
+        sage: from sage.features.sat import Pycosat
+        sage: PycosatExecutable().is_present()                  # optional - pycosat
+        FeatureTestResult('pycosat', True)
+    """
+    def __init__(self):
+        r"""
+        TESTS::
+
+            sage: from sage.features.sat import Pycosat
+            sage: isinstance(Pycosat(), Pycosat)
+            True
+        """
+        PythonModule.__init__(self, "pycosat",
+                              spkg="pycosat", type="optional")
+
+
+def all_features():
+    return [Glucose(),
+            Kissat(),
+            Pycosat()]

src/sage/sat/solvers/picosat.py

@@ -21,9 +21,9 @@
 from .satsolver import SatSolver
 
 from sage.misc.lazy_import import lazy_import
-from sage.features import PythonModule
-lazy_import('pycosat', ['solve'],
-            feature=PythonModule('pycosat', spkg='pycosat'))
+from sage.features.sat import Pycosat
+
+lazy_import('pycosat', ['solve'], feature=Pycosat())
 
 
 class PicoSAT(SatSolver):