Simplify BasicSet.__str__

[linpy.git] / pypol / linear.py

diff --git a/pypol/linear.py b/pypol/linear.py
index 9584609..8e96f35 100644 (file)
--- a/pypol/linear.py
+++ b/pypol/linear.py
@@ -1,15 +1,12 @@
+import ctypes, ctypes.util

 import functools
 import numbers
 import functools
 import numbers

-import json
-import ctypes, ctypes.util
-from pypol import isl
-from . import isl, islhelper

 
 from fractions import Fraction, gcd
 
 
 from fractions import Fraction, gcd
 

-libisl = ctypes.CDLL(ctypes.util.find_library('isl'))
+from . import isl
+from .isl import libisl

 
 

-libisl.isl_printer_get_str.restype = ctypes.c_char_p

 
 __all__ = [
     'Expression',
 
 __all__ = [
     'Expression',


@@ -19,16 +16,6 @@ __all__ = [
     'empty', 'universe'
 ]
 
     'empty', 'universe'
 ]
 

-ids = {}
-
-def get_ids(co):
-    if co in ids:
-        return ids.get(co)
-    else:
-        idd = len(ids)
-        ids[co] = idd
-        #print(ids)
-        return idd

 
 def _polymorphic_method(func):
     @functools.wraps(func)
 
 def _polymorphic_method(func):
     @functools.wraps(func)


@@ -54,27 +41,8 @@ def _polymorphic_operator(func):
         raise TypeError('arguments must be linear expressions')
     return wrapper
 
         raise TypeError('arguments must be linear expressions')
     return wrapper
 

-class Context:
-
-    __slots__ = ('_ic')
-
-    def __init__(self):
-        self._ic = libisl.isl_ctx_alloc()
-
-    @property
-    def _as_parameter_(self):
-        return self._ic
-    
-    #comment out so does not delete itself after being created 
-    #def __del__(self):
-    #   libisl.isl_ctx_free(self)
-
-    def __eq__(self, other):
-        if not isinstance(other, Context):
-            return False
-        return self._ic == other._ic
-

 
 

+_main_ctx = isl.Context()

 
 
 class Expression:
 
 
 class Expression:


@@ -148,7 +116,6 @@ class Expression:
             return self.coefficient(symbol)
         return int(self.constant)
 
             return self.coefficient(symbol)
         return int(self.constant)
 

-

     def symbol(self):
         if not self.issymbol():
             raise ValueError('not a symbol: {}'.format(self))
     def symbol(self):
         if not self.issymbol():
             raise ValueError('not a symbol: {}'.format(self))


@@ -193,7 +160,7 @@ class Expression:
 
     def __rsub__(self, other):
         return -(self - other)
 
     def __rsub__(self, other):
         return -(self - other)

-    
+

     @_polymorphic_method
     def __mul__(self, other):
         if other.isconstant():
     @_polymorphic_method
     def __mul__(self, other):
         if other.isconstant():


@@ -392,16 +359,9 @@ class Polyhedron:
                     if value.denominator != 1:
                         raise TypeError('non-integer constraint: '
                                 '{} <= 0'.format(constraint))
                     if value.denominator != 1:
                         raise TypeError('non-integer constraint: '
                                 '{} <= 0'.format(constraint))

-                self._inequalities.append(constraint)      
-        self._bset = self.to_isl()
-        #print(self._bset)
-        #put this here just to test from isl method
-        #from_isl = self.from_isl(self._bset)
-        #print(from_isl)
-        #rint(self)
-        return self 
-   
-  
+                self._inequalities.append(constraint)
+        return self
+

     @property
     def equalities(self):
         yield from self._equalities
     @property
     def equalities(self):
         yield from self._equalities


@@ -409,15 +369,14 @@ class Polyhedron:
     @property
     def inequalities(self):
         yield from self._inequalities
     @property
     def inequalities(self):
         yield from self._inequalities

-        
+

     @property
     def constant(self):
         return self._constant
 
     def isconstant(self):
         return len(self._coefficients) == 0
     @property
     def constant(self):
         return self._constant
 
     def isconstant(self):
         return len(self._coefficients) == 0

-    
-        
+

     def isempty(self):
         return bool(libisl.isl_basic_set_is_empty(self._bset))
 
     def isempty(self):
         return bool(libisl.isl_basic_set_is_empty(self._bset))
 


@@ -425,13 +384,12 @@ class Polyhedron:
         yield from self.equalities
         yield from self.inequalities
 
         yield from self.equalities
         yield from self.inequalities
 

-

     def symbols(self):
         s = set()
         for constraint in self.constraints():
             s.update(constraint.symbols())
         return sorted(s)
     def symbols(self):
         s = set()
         for constraint in self.constraints():
             s.update(constraint.symbols())
         return sorted(s)

-                    
+

     @property
     def dimension(self):
         return len(self.symbols())
     @property
     def dimension(self):
         return len(self.symbols())


@@ -442,7 +400,6 @@ class Polyhedron:
             return False
         else:
             return True
             return False
         else:
             return True

-        

 
     def __contains__(self, value):
         # is the value in the polyhedron?
 
     def __contains__(self, value):
         # is the value in the polyhedron?


@@ -474,9 +431,9 @@ class Polyhedron:
         # test whether every element in other is in the polyhedron
         for value in other:
             if value == self.constraints():
         # test whether every element in other is in the polyhedron
         for value in other:
             if value == self.constraints():

-                return True 
+                return True

             else:
             else:

-                return False     
+                return False

         raise NotImplementedError
 
     def __ge__(self, other):
         raise NotImplementedError
 
     def __ge__(self, other):


@@ -533,25 +490,19 @@ class Polyhedron:
     @classmethod
     def fromstring(cls, string):
         raise NotImplementedError
     @classmethod
     def fromstring(cls, string):
         raise NotImplementedError

-    
-    def _symbolunion(self, *others): 
-        print(self)
+
+    def _symbolunion(self, *others):

         symbols = set(self.symbols())
         for other in others:
             symbols.update(other.symbols())
         return sorted(symbols)
         symbols = set(self.symbols())
         for other in others:
             symbols.update(other.symbols())
         return sorted(symbols)

-    
-    def to_isl(self, symbols=None):
+
+    def _to_isl(self, symbols=None):

         if symbols is None:
             symbols = self.symbols()
         if symbols is None:
             symbols = self.symbols()

-            print(symbols)
-        print('>>>', self)
-        print('eq:', list(self.equalities))
-        print('ineq:', list(self.inequalities)) 

         num_coefficients = len(symbols)
         num_coefficients = len(symbols)

-        ctx = Context()
-        space = libisl.isl_space_set_alloc(ctx, 0, num_coefficients)
-        bset = libisl.isl_basic_set_universe(libisl.isl_space_copy(space)) 
+        space = libisl.isl_space_set_alloc(_main_ctx, 0, num_coefficients)
+        bset = libisl.isl_basic_set_universe(libisl.isl_space_copy(space))

         ls = libisl.isl_local_space_from_space(space)
         ceq = libisl.isl_equality_alloc(libisl.isl_local_space_copy(ls))
         cin = libisl.isl_inequality_alloc(libisl.isl_local_space_copy(ls))
         ls = libisl.isl_local_space_from_space(space)
         ceq = libisl.isl_equality_alloc(libisl.isl_local_space_copy(ls))
         cin = libisl.isl_inequality_alloc(libisl.isl_local_space_copy(ls))


@@ -565,9 +516,8 @@ class Polyhedron:
                 for eq in coeff_eq:
                     num = coeff_eq.get(eq)
                     iden = symbols.index(eq)
                 for eq in coeff_eq:
                     num = coeff_eq.get(eq)
                     iden = symbols.index(eq)

-                    print('id of var {} is {}, coeff is {}'.format(eq, iden, num))
-                    ceq = libisl.isl_constraint_set_coefficient_si(ceq, islhelper.isl_dim_set, iden, num)  #use 3 for type isl_dim_set 
-            bset = libisl.isl_basic_set_add_constraint(bset, ceq)                   
+                    ceq = libisl.isl_constraint_set_coefficient_si(ceq, libisl.isl_dim_set, iden, num)  #use 3 for type isl_dim_set
+            bset = libisl.isl_basic_set_add_constraint(bset, ceq)

         if list(self.inequalities): #check if any inequalities exist
             for ineq in self.inequalities:
                 coeff_in = dict(ineq.coefficients)
         if list(self.inequalities): #check if any inequalities exist
             for ineq in self.inequalities:
                 coeff_in = dict(ineq.coefficients)


@@ -577,17 +527,11 @@ class Polyhedron:
                 for ineq in coeff_in:
                     num = coeff_in.get(ineq)
                     iden = symbols.index(ineq)
                 for ineq in coeff_in:
                     num = coeff_in.get(ineq)
                     iden = symbols.index(ineq)

-                    print('id of var {} is {}, coeff is {}'.format(ineq, iden, num))
-                    cin = libisl.isl_constraint_set_coefficient_si(cin, islhelper.isl_dim_set, iden, num)  #use 3 for type isl_dim_set 
-            bset = libisl.isl_basic_set_add_constraint(bset, cin)                   
-        ip = libisl.isl_printer_to_str(ctx) #create string printer
-        ip = libisl.isl_printer_print_basic_set(ip, bset) #print basic set to printer 
-        string = libisl.isl_printer_get_str(ip)   #get string from printer
-        string = str(string.decode())    
-        print(string)
+                    cin = libisl.isl_constraint_set_coefficient_si(cin, libisl.isl_dim_set, iden, num)  #use 3 for type isl_dim_set
+            bset = libisl.isl_basic_set_add_constraint(bset, cin)
+        bset = isl.BasicSet(bset)

         return bset
         return bset

-    
-    
+

     def from_isl(self, bset):
         '''takes basic set in isl form and puts back into python version of polyhedron
         isl example code gives isl form as:
     def from_isl(self, bset):
         '''takes basic set in isl form and puts back into python version of polyhedron
         isl example code gives isl form as:


@@ -596,21 +540,18 @@ class Polyhedron:
             b'{ [i0] : 1 = 0 }' '''
         #bset = self
         if self._equalities:
             b'{ [i0] : 1 = 0 }' '''
         #bset = self
         if self._equalities:

-            constraints = libisl.isl_basic_set_equalities_matrix(bset, 3) 
+            constraints = libisl.isl_basic_set_equalities_matrix(bset, 3)

         elif self._inequalities:
         elif self._inequalities:

-            constraints = libisl.isl_basic_set_inequalities_matrix(bset, 3)    
+            constraints = libisl.isl_basic_set_inequalities_matrix(bset, 3)

         print(constraints)
         return constraints
 
         print(constraints)
         return constraints
 

-#empty = eq(0,1)
-empty = None
-universe = None
+empty = None #eq(0,1)
+universe = None #Polyhedron()

 
 if __name__ == '__main__':
     ex1 = Expression(coefficients={'a': 1, 'x': 2}, constant=2)
     ex2 = Expression(coefficients={'a': 3  , 'b': 2}, constant=3)
     p = Polyhedron(inequalities=[ex1, ex2])
 
 if __name__ == '__main__':
     ex1 = Expression(coefficients={'a': 1, 'x': 2}, constant=2)
     ex2 = Expression(coefficients={'a': 3  , 'b': 2}, constant=3)
     p = Polyhedron(inequalities=[ex1, ex2])

-    #p = eq(ex2, 0)# 2a+4 = 0, in fact 6a+3 = 0
-    #p.to_isl()
-
-#universe = Polyhedron()
+    bs = p._to_isl()
+    print(bs)