Improve error messages in linexprs.py

[linpy.git] / pypol / domains.py

diff --git a/pypol/domains.py b/pypol/domains.py
index 255c995..d80fd91 100644 (file)
--- a/pypol/domains.py
+++ b/pypol/domains.py
@@ -5,8 +5,8 @@ import re
 from fractions import Fraction
 
 from . import islhelper
-from .islhelper import mainctx, libisl, isl_set_basic_sets
-from .coordinates import Point
+from .islhelper import mainctx, libisl
+from .geometry import GeometricObject, Point
 from .linexprs import Expression, Symbol
 
 
@@ -17,7 +17,7 @@ __all__ = [
 
 
 @functools.total_ordering
-class Domain:
+class Domain(GeometricObject):
 
     __slots__ = (
         '_polyhedra',
@@ -28,14 +28,14 @@ class Domain:
     def __new__(cls, *polyhedra):
         from .polyhedra import Polyhedron
         if len(polyhedra) == 1:
-            polyhedron = polyhedra[0]
-            if isinstance(polyhedron, str):
-                return cls.fromstring(polyhedron)
-            elif isinstance(polyhedron, Polyhedron):
-                return polyhedron
+            argument = polyhedra[0]
+            if isinstance(argument, str):
+                return cls.fromstring(argument)
+            elif isinstance(argument, GeometricObject):
+                return argument.aspolyhedron()
             else:
                 raise TypeError('argument must be a string '
-                    'or a Polyhedron instance')
+                    'or a GeometricObject instance')
         else:
             for polyhedron in polyhedra:
                 if not isinstance(polyhedron, Polyhedron):
@@ -154,6 +154,9 @@ class Domain:
         islbset = libisl.isl_set_polyhedral_hull(islset)
         return Polyhedron._fromislbasicset(islbset, self.symbols)
 
+    def asdomain(self):
+        return self
+
     def project(self, dims):
         # use to remove certain variables
         islset = self._toislset(self.polyhedra, self.symbols)
@@ -327,7 +330,7 @@ class Domain:
     def _fromislset(cls, islset, symbols):
         from .polyhedra import Polyhedron
         islset = libisl.isl_set_remove_divs(islset)
-        islbsets = isl_set_basic_sets(islset)
+        islbsets = islhelper.isl_set_basic_sets(islset)
         libisl.isl_set_free(islset)
         polyhedra = []
         for islbset in islbsets: