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
return Domain._fromislset(islset, dims)
def sample(self):
- from .polyhedra import Polyhedron
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:
libisl.isl_set_free(islset)
return value
+ _RE_COORDINATE = re.compile(r'\((?P<num>\-?\d+)\)(/(?P<den>\d+))?')
+
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)
+ points = {}
+ num = 0
+ vertices_points = []
for vertex in vertices:
- expr = libisl.isl_vertex_get_expr(vertex);
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:
+ points = []
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():
- 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)
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
self._dimension = len(self._symbols)
return self
+ @classmethod
def _toislset(cls, polyhedra, symbols):
polyhedron = polyhedra[0]
islbset = polyhedron._toislbasicset(polyhedron.equalities,