From 23787dd83c4990ca14e52ce3ddff256e26397cdc Mon Sep 17 00:00:00 2001
From: Danielle Bolan <n02702451@hawkmail.newpaltz.edu>
Date: Fri, 6 Jun 2014 16:53:46 +0200
Subject: [PATCH] current update:very messy and very broken!

---
 pypol/linear.py | 97 ++++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 87 insertions(+), 10 deletions(-)

diff --git a/pypol/linear.py b/pypol/linear.py
index a5f55fa..d1aa882 100644
--- a/pypol/linear.py
+++ b/pypol/linear.py
@@ -1,9 +1,17 @@
+'''
+VERY MESSY, made notes on where I will change things
+'''
 
 import functools
 import numbers
+import ctypes, ctypes.util
+from pypol import isl
 
 from fractions import Fraction, gcd
 
+libisl = ctypes.CDLL(ctypes.util.find_library('isl'))
+
+libisl.isl_printer_get_str.restype = ctypes.c_char_p
 
 __all__ = [
     'Expression',
@@ -14,6 +22,8 @@ __all__ = [
 ]
 
 
+_CONTEXT = isl.Context()
+
 def _polymorphic_method(func):
     @functools.wraps(func)
     def wrapper(a, b):
@@ -68,6 +78,7 @@ class Expression:
         self._constant = constant
         return self
 
+
     def symbols(self):
         yield from sorted(self._coefficients)
 
@@ -103,6 +114,12 @@ class Expression:
             yield self.coefficient(symbol)
         yield self.constant
 
+    def values_int(self):
+        for symbol in self.symbols():
+            return self.coefficient(symbol)
+        return int(self.constant)
+
+
     def symbol(self):
         if not self.issymbol():
             raise ValueError('not a symbol: {}'.format(self))
@@ -177,7 +194,7 @@ class Expression:
         return NotImplemented
 
     def __rtruediv__(self, other):
-        if isinstance(other, Rational):
+        if isinstance(other, self):
             if self.isconstant():
                 constant = Fraction(other, self.constant)
                 return Expression(constant=constant)
@@ -345,9 +362,14 @@ class Polyhedron:
                     if value.denominator != 1:
                         raise TypeError('non-integer constraint: '
                                 '{} <= 0'.format(constraint))
-                self._inequalities.append(constraint)
-        return self
-
+                self._inequalities.append(constraint)      
+        print('in polyhedron')  
+        #print(self.constraints())
+        self._bset = self.to_isl()
+        #print(self._bset)
+        return self 
+   
+  
     @property
     def equalities(self):
         yield from self._equalities
@@ -355,24 +377,46 @@ class Polyhedron:
     @property
     def inequalities(self):
         yield from self._inequalities
+        
+    @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 constraints(self):
         yield from self.equalities
         yield from self.inequalities
 
+
     def symbols(self):
         s = set()
         for constraint in self.constraints():
             s.update(constraint.symbols)
-        yield from sorted(s)
-
+            yield from sorted(s)
+            
+    def symbol_count(self):
+        s = []
+        for constraint in self.constraints():
+            s.append(constraint.symbols)
+        return s     
+        
     @property
     def dimension(self):
         return len(self.symbols())
 
     def __bool__(self):
         # return false if the polyhedron is empty, true otherwise
-        raise NotImplementedError
+        if self._equalities or self._inequalities:
+            return False
+        else:
+            return True
+        
 
     def __contains__(self, value):
         # is the value in the polyhedron?
@@ -381,8 +425,8 @@ class Polyhedron:
     def __eq__(self, other):
         raise NotImplementedError
 
-    def isempty(self):
-        return self == empty
+    def is_empty(self):
+        return
 
     def isuniverse(self):
         return self == universe
@@ -402,6 +446,11 @@ class Polyhedron:
 
     def issuperset(self, other):
         # test whether every element in other is in the polyhedron
+        for value in other:
+            if value == self.constraints():
+                return True 
+            else:
+                return False     
         raise NotImplementedError
 
     def __ge__(self, other):
@@ -458,8 +507,36 @@ class Polyhedron:
     @classmethod
     def fromstring(cls, string):
         raise NotImplementedError
+    
+    def to_isl(self):
+        space = libisl.isl_space_set_alloc(_CONTEXT, 0, len(self.symbol_count()))
+        bset = libisl.isl_basic_set_universe(libisl.isl_space_copy(space))
+        copy = libisl.isl_basic_set_copy(bset)
+        ls = libisl.isl_local_space_from_space(libisl.isl_space_copy(space))
+        ceq = libisl.isl_equality_alloc(libisl.isl_local_space_copy(ls))
+        for value in self.equalities:    
+            for value in self.equalities:
+                #need method to get expression value 
+                if self._equalities:
+                    value = self._equalities.method_get_value_from_expression()
+                    ceq = libisl.isl_constraint_set_constant_val(ceq, value ) 
+                    #ceq = libisl.isl_constraint_set_coefficient_si(ceq, libisl.isl_set_dim, self.symbols(), value)                              
+        '''
+        cin = libisl.isl_inequality_alloc(libisl.isl_local_space_copy(ls))
+        for item in self.inequalities:     
+                   for item in self.inequalities:
+                if isinstance(item, int):
+                    cin = libisl.isl_constraint_set_constant_si(cin, item) 
+                else:    
+                    cin = libisl.isl_constraint_set_coefficient_si(cin, libisl.isl_set_dim, self.symbols(), item)
+                    '''
+        bsetfinal = libisl.isl_basic_set_add_contraint(copy, ceq)
+        #bsetfinal = libisl.isl_basic_set_add_contraint(copy, cin)
+        string = libisl.isl_printer_print_basic_set(bsetfinal)
+        print(string)
+        return self
 
+empty = eq(1, 1)
 
-empty = le(1, 0)
 
 universe = Polyhedron()
-- 
2.20.1