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
+from .linexprs import Expression, Symbol
__all__ = [
symbols = set()
for item in iterator:
symbols.update(item.symbols)
- return tuple(sorted(symbols, key=lambda symbol: symbol.name))
+ return tuple(sorted(symbols, key=Symbol.sortkey))
@property
def polyhedra(self):
islset = libisl.isl_set_remove_redundancies(islset)
return self._fromislset(islset, self.symbols)
- def polyhedral_hull(self):
+ def aspolyhedron(self):
# several types of hull are available
# polyhedral seems to be the more appropriate, to be checked
from .polyhedra import Polyhedron
islbset = libisl.isl_set_polyhedral_hull(islset)
return Polyhedron._fromislbasicset(islbset, self.symbols)
- def project_out(self, symbols):
+ def project(self, dims):
# use to remove certain variables
islset = self._toislset(self.polyhedra, self.symbols)
n = 0
for index, symbol in reversed(list(enumerate(self.symbols))):
- if symbol in symbols:
+ if symbol in dims:
n += 1
elif n > 0:
islset = libisl.isl_set_project_out(islset, libisl.isl_dim_set, index + 1, n)
n = 0
if n > 0:
islset = libisl.isl_set_project_out(islset, libisl.isl_dim_set, 0, n)
- symbols = [symbol for symbol in self.symbols if symbol not in symbols]
- return Domain._fromislset(islset, symbols)
+ dims = [symbol for symbol in self.symbols if symbol not in dims]
+ 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)
- 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:
islset = libisl.isl_set_lexmax(islset)
return self._fromislset(islset, self.symbols)
+ def num_parameters(self):
+ #could be useful with large, complicated polyhedrons
+ islbset = self._toislbasicset(self.equalities, self.inequalities, self.symbols)
+ num = libisl.isl_basic_set_dim(islbset, libisl.isl_dim_set)
+ return num
+
+ def involves_dims(self, dims):
+ #could be useful with large, complicated polyhedrons
+ islset = self._toislset(self.polyhedra, self.symbols)
+ dims = sorted(dims)
+ symbols = sorted(list(self.symbols))
+ n = 0
+ if len(dims)>0:
+ for dim in dims:
+ if dim in symbols:
+ first = symbols.index(dims[0])
+ n +=1
+ else:
+ first = 0
+ else:
+ return False
+ value = bool(libisl.isl_set_involves_dims(islset, libisl.isl_dim_set, first, n))
+ 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 = []
+ symbols = list(self.symbols)
+ for vertex in vertices:
+ expr = libisl.isl_vertex_get_expr(vertex); #make vertices a bset
+ if islhelper.isl_version < '0.13':
+ constraints = islhelper.isl_basic_set_constraints(expr) #get bset constraints
+ for dim in symbols:
+ index = symbols.index(dim)
+ for c in constraints: #for each constraint
+ constant = libisl.isl_constraint_get_constant_val(c) #get contant 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.update({dim:num})
+ vertices_points.append(points)
+ print(points)
+
+ else:
+ points = []
+ 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
+
+ def points(self):
+ if not self.isbounded():
+ 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 = []
+ for islpoint in islpoints:
+ 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
+ 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,
projects / linpy.git / blobdiff