Adding SNLPath methods (#120)

src/snl/python/snl_wrapping/PySNLPath.cpp

@@ -51,13 +51,22 @@ ManagedTypeDeallocMethod(SNLPath)
 
 GetBoolAttribute(Path, empty)
 GetSizetAttribute(Path, size)
+GetObjectMethod(Path, Instance, getHeadInstance)
+GetObjectMethod(Path, Instance, getTailInstance)
 GetObjectMethod(Path, Path, getHeadPath)
+GetObjectMethod(Path, Path, getTailPath)
 
 PyMethodDef PySNLPath_Methods[] = {
   { "empty", (PyCFunction)PySNLPath_empty, METH_NOARGS,
     "Returns True if this path is empty"},
+  { "getHeadInstance", (PyCFunction)PySNLPath_getHeadInstance, METH_NOARGS,
+    "Returns the head instance of this path"},
+  { "getTailInstance", (PyCFunction)PySNLPath_getTailInstance, METH_NOARGS,
+    "Returns the tail instance of this path"},
   { "getHeadPath", (PyCFunction)PySNLPath_getHeadPath, METH_NOARGS,
     "Returns the head path of this path"},
+  { "getTailPath", (PyCFunction)PySNLPath_getTailPath, METH_NOARGS,
+    "Returns the tail path of this path"},
   { "size", (PyCFunction)PySNLPath_size, METH_NOARGS,
     "Returns the size of this path"},
   {NULL, NULL, 0, NULL} /* sentinel */

test/snl/python/snl_wrapping/test_snlpath.py

@@ -23,27 +23,32 @@ def testFunctions(self):
     ins1 = snl.SNLInstance.create(self.top, self.model, "ins1")
 
     path0 = snl.SNLPath()
-    print(path0)
     self.assertIsNotNone(path0)
     self.assertTrue(path0.empty())
     self.assertEqual(0, path0.size())
     self.assertEqual(snl.SNLPath(), path0.getHeadPath())
+    self.assertEqual(snl.SNLPath(), path0.getTailPath())
+    self.assertIsNone(path0.getHeadInstance())
+    self.assertIsNone(path0.getTailInstance())
 
     path1 = snl.SNLPath(ins1)
     self.assertIsNotNone(path1)
     self.assertFalse(path1.empty())
     self.assertEqual(1, path1.size())
     self.assertEqual(snl.SNLPath(), path1.getHeadPath())
+    self.assertEqual(snl.SNLPath(), path1.getTailPath())
+    self.assertEqual(ins1, path1.getHeadInstance())
+    self.assertEqual(ins1, path1.getTailInstance())
 
     path2 = snl.SNLPath(path1, ins2)
     self.assertIsNotNone(path2)
     self.assertFalse(path2.empty())
     self.assertEqual(2, path2.size())
     self.assertEqual(path1, path2.getHeadPath())
+    self.assertEqual(snl.SNLPath(ins2), path2.getTailPath())
+    self.assertEqual(ins1, path2.getHeadInstance())
+    self.assertEqual(ins2, path2.getTailInstance())
 
-    path3 = snl.SNLPath(ins2)
-    path4 = snl.SNLPath(ins1, path3)
-
     with self.assertRaises(RuntimeError) as context: snl.SNLPath(path1)
     with self.assertRaises(RuntimeError) as context: snl.SNLPath(path1, path2)
     with self.assertRaises(RuntimeError) as context: snl.SNLPath(1, 1, 1)