Add plot method

[linpy.git] / pypol / domains.py

diff --git a/pypol/domains.py b/pypol/domains.py
index 632335b..375be85 100644 (file)
--- a/pypol/domains.py
+++ b/pypol/domains.py
@@ -2,8 +2,9 @@ import ast
 import functools
 import re
 
 import functools
 import re
 

-from . import islhelper
+from fractions import Fraction

 
 

+from . import islhelper

 from .islhelper import mainctx, libisl, isl_set_basic_sets
 from .linexprs import Expression, Symbol
 
 from .islhelper import mainctx, libisl, isl_set_basic_sets
 from .linexprs import Expression, Symbol
 


@@ -168,12 +169,19 @@ class Domain:
         return Domain._fromislset(islset, dims)
 
     def sample(self):
         return Domain._fromislset(islset, dims)
 
     def sample(self):

-        from .polyhedra import Polyhedron

         islset = self._toislset(self.polyhedra, self.symbols)
         islset = self._toislset(self.polyhedra, self.symbols)

-        islbset = libisl.isl_set_sample(islset)
-        # next instruction should NOT be required
-        islbset = libisl.isl_basic_set_finalize(islbset)
-        return Polyhedron._fromislbasicset(islbset, self.symbols)
+        islpoint = libisl.isl_set_sample_point(islset)
+        if bool(libisl.isl_point_is_void(islpoint)):
+            libisl.isl_point_free(islpoint)
+            raise ValueError('domain must be non-empty')
+        point = {}
+        for index, symbol in enumerate(self.symbols):
+            coordinate = libisl.isl_point_get_coordinate_val(islpoint,
+                libisl.isl_dim_set, index)
+            coordinate = islhelper.isl_val_to_int(coordinate)
+            point[symbol] = coordinate
+        libisl.isl_point_free(islpoint)
+        return point

 
     def intersection(self, *others):
         if len(others) == 0:
 
     def intersection(self, *others):
         if len(others) == 0:


@@ -249,21 +257,48 @@ class Domain:
         libisl.isl_set_free(islset)
         return value
 
         libisl.isl_set_free(islset)
         return value
 

+    _RE_COORDINATE = re.compile(r'\((?P<num>\-?\d+)\)(/(?P<den>\d+))?')
+

     def vertices(self):
     def vertices(self):

+        #returning list of verticies
+        from .polyhedra import Polyhedron

         islbset = self._toislbasicset(self.equalities, self.inequalities, self.symbols)
         vertices = libisl.isl_basic_set_compute_vertices(islbset);
         vertices = islhelper.isl_vertices_vertices(vertices)
         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 = []

         for vertex in vertices:
         for vertex in vertices:

-            expr = libisl.isl_vertex_get_expr(vertex);

             if islhelper.isl_version < '0.13':
             if islhelper.isl_version < '0.13':

-                string = islhelper.isl_set_to_str(expr)
+                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
+                        if coefficient != 0:
+                            num = -Fraction(constant, coefficient)
+                            points[dim]= float(num)
+                vertices_points.append(points.copy())

             else:
             else:

+                points = []

                 string = islhelper.isl_multi_aff_to_str(expr)
                 string = islhelper.isl_multi_aff_to_str(expr)

-            print(string)
-
+                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
+    

     def points(self):
         if not self.isbounded():
     def points(self):
         if not self.isbounded():

-            raise ValueError('domain must be unbounded')
+            raise ValueError('domain must be bounded')

         from .polyhedra import Universe, Eq
         islset = self._toislset(self.polyhedra, self.symbols)
         islpoints = islhelper.isl_set_points(islset)
         from .polyhedra import Universe, Eq
         islset = self._toislset(self.polyhedra, self.symbols)
         islpoints = islhelper.isl_set_points(islset)


@@ -278,6 +313,11 @@ class Domain:
             points.append(point)
         return points
 
             points.append(point)
         return points
 

+    def subs(self, symbol, expression=None):
+        polyhedra = [polyhedron.subs(symbol, expression)
+            for polyhedron in self.polyhedra]
+        return Domain(*polyhedra)
+

     @classmethod
     def _fromislset(cls, islset, symbols):
         from .polyhedra import Polyhedron
     @classmethod
     def _fromislset(cls, islset, symbols):
         from .polyhedra import Polyhedron


@@ -300,6 +340,7 @@ class Domain:
             self._dimension = len(self._symbols)
             return self
 
             self._dimension = len(self._symbols)
             return self
 

+    @classmethod

     def _toislset(cls, polyhedra, symbols):
         polyhedron = polyhedra[0]
         islbset = polyhedron._toislbasicset(polyhedron.equalities,
     def _toislset(cls, polyhedra, symbols):
         polyhedron = polyhedra[0]
         islbset = polyhedron._toislbasicset(polyhedron.equalities,