From dba7d8fa774455d02d3cd3e0ab740fa9a727e4bb Mon Sep 17 00:00:00 2001
From: Vivien Maisonneuve <v.maisonneuve@gmail.com>
Date: Wed, 9 Jul 2014 18:07:44 +0200
Subject: [PATCH] Fix Polyhedron.vertices() for ISL 0.13

---
 pypol/domains.py | 36 +++++++++++++++++-------------------
 1 file changed, 17 insertions(+), 19 deletions(-)

diff --git a/pypol/domains.py b/pypol/domains.py
index 375be85..45040c8 100644
--- a/pypol/domains.py
+++ b/pypol/domains.py
@@ -265,37 +265,35 @@ class Domain:
         islbset = self._toislbasicset(self.equalities, self.inequalities, self.symbols)
         vertices = libisl.isl_basic_set_compute_vertices(islbset);
         vertices = islhelper.isl_vertices_vertices(vertices)
-        points = {}
-        num = 0
-        vertices_points = []
+        points = []
         for vertex in vertices:
+            expr = libisl.isl_vertex_get_expr(vertex)
+            point = {}
             if islhelper.isl_version < '0.13':
-                expr = libisl.isl_vertex_get_expr(vertex)
-                constraints = islhelper.isl_basic_set_constraints(expr) #get bset constraints
-                for index, dim in enumerate(self.symbols):
-                    for c in constraints: #for each constraint
-                        constant = libisl.isl_constraint_get_constant_val(c) #get constant value
-                        constant = islhelper.isl_val_to_int(constant)
-                        coefficient = libisl.isl_constraint_get_coefficient_val(c,libisl.isl_dim_set, index)
-                        coefficient = islhelper.isl_val_to_int(coefficient) #get coefficient
+                constraints = islhelper.isl_basic_set_constraints(expr)
+                for constraint in constraints:
+                    constant = libisl.isl_constraint_get_constant_val(constraint)
+                    constant = islhelper.isl_val_to_int(constant)
+                    for index, symbol in enumerate(self.symbols):
+                        coefficient = libisl.isl_constraint_get_coefficient_val(constraint,
+                            libisl.isl_dim_set, index)
+                        coefficient = islhelper.isl_val_to_int(coefficient)
                         if coefficient != 0:
-                            num = -Fraction(constant, coefficient)
-                            points[dim]= float(num)
-                vertices_points.append(points.copy())
+                            coordinate = -Fraction(constant, coefficient)
+                            point[symbol]= coordinate
             else:
-                points = []
+                # horrible hack, find a cleaner solution
                 string = islhelper.isl_multi_aff_to_str(expr)
                 matches = self._RE_COORDINATE.finditer(string)
-                point = {}
                 for symbol, match in zip(self.symbols, matches):
                     numerator = int(match.group('num'))
                     denominator = match.group('den')
                     denominator = 1 if denominator is None else int(denominator)
                     coordinate = Fraction(numerator, denominator)
                     point[symbol] = coordinate
-                points.append(point)
-        return vertices_points
-    
+            points.append(point)
+        return points
+
     def points(self):
         if not self.isbounded():
             raise ValueError('domain must be bounded')
-- 
2.20.1