no errors: dim type and id value updated

diff --git a/pypol/linear.py b/pypol/linear.py
index 2ef0d2a..5dfddfe 100644 (file)
--- a/pypol/linear.py
+++ b/pypol/linear.py
@@ -1,5 +1,6 @@
 import functools
 import numbers
+import json
 import ctypes, ctypes.util
 from pypol import isl
 
@@ -17,8 +18,28 @@ __all__ = [
     'empty', 'universe'
 ]
 
-
-_CONTEXT = isl.Context()
+'''
+def symbolToInt(self):
+     make dictionary of key:value (letter:integer)
+        iterate through the dictionary to find matching symbol
+        return the given integer value
+    d = {'a': 1, 'b': 2, 'c': 3, 'd': 4, 'e': 5, 'f': 6, 'g': 7, 'h': 8, 'i': 6, 'j': 10, 'k': 11, 'l': 12, 'm': 13, 'n': 14, 
+         'o': 15, 'p': 16, 'q': 17, 'r': 18, 's': 19, 't': 20, 'u': 21, 'v': 22, 'w': 23, 'x': 24, 'y': 25, 'z': 26}
+    if self in d:
+        num = d.get(self)
+    return num
+'''
+
+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)
@@ -44,6 +65,28 @@ def _polymorphic_operator(func):
         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
+
+
+
 
 class Expression:
     """
@@ -361,6 +404,11 @@ class Polyhedron:
                                 '{} <= 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._bset 
    
   
@@ -393,13 +441,7 @@ class Polyhedron:
         for constraint in self.constraints():
             s.update(constraint.symbols)
             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())
@@ -503,24 +545,26 @@ class Polyhedron:
         raise NotImplementedError
     
     def to_isl(self):
-        space = libisl.isl_space_set_alloc(_CONTEXT, 0, len(self.symbol_count()))
+        #d = Expression().__dict__  #write expression values to dictionary in form {'_constant': value, '_coefficients': value}
+        d = {'_constant': 2, '_coefficients': {'b':1}}  
+        coeff = d.get('_coefficients')
+        num_coefficients = len(coeff)
+        space = libisl.isl_space_set_alloc(Context(), 0, num_coefficients)
         bset = libisl.isl_basic_set_empty(libisl.isl_space_copy(space))
         ls = libisl.isl_local_space_from_space(libisl.isl_space_copy(space))
         ceq = libisl.isl_equality_alloc(libisl.isl_local_space_copy(ls))
         cin = libisl.isl_inequality_alloc(libisl.isl_local_space_copy(ls))
-        d = Expression().__dict__  #write expression values to dictionary in form {'_constant': value, '_coefficients': value}      
-        '''
-        if there are equalities/inequalities, take each constant and coefficient and add as a constraint to the basic set
-        need to change the symbols method to a lookup table for the integer value for each letter that could be a symbol
-        '''
+        '''if there are equalities/inequalities, take each constant and coefficient and add as a constraint to the basic set
+        need to change the symbols method to a lookup table for the integer value for each letter that could be a symbol'''
         if self._equalities:
             if '_constant' in d:
                 value = d.get('_constant')
                 ceq = libisl.isl_constraint_set_constant_si(ceq, value)
             if '_coefficients' in d: 
                 value_co = d.get('_coefficients')
-                if value_co:   #if dictionary not empty add coefficient as to constraint    
-                    ceq = libisl.isl_constraint_set_coefficient_si(ceq, libisl.isl_set_dim, self.symbols(), value_co)  
+                for co in value_co:
+                    num = value_co.get(co)
+                    ceq = libisl.isl_constraint_set_coefficient_si(ceq, 3, get_ids(co), num)  #use 3 for type isl_dim_set 
             bset = libisl.isl_set_add_constraint(bset, ceq) 
                        
         if self._inequalities:     
@@ -528,17 +572,29 @@ class Polyhedron:
                 value = d.get('_constant')
                 cin = libisl.isl_constraint_set_constant_si(cin, value)   
             if '_coefficients' in d: 
-                value_co = d.get('_coefficients')   
-                if value_co: #if dictionary not empty add coefficient as to constraint
-                    cin = libisl.isl_constraint_set_coefficient_si(cin, libisl.isl_set_dim, self.symbols(), value_co)
+                value_co = d.get('_coefficients') 
+                for co in value_co:
+                    num = value_co.get(co)
+                    if value_co: #if dictionary not empty add coefficient as to constraint
+                        cin = libisl.isl_constraint_set_coefficient_si(cin, 3, get_ids(co), num) #use 3 for type isl_dim_set
             bset = libisl.isl_set_add_constraint(bset, cin) 
-        ip = libisl.isl_printer_to_str(_CONTEXT) #create string printer
+        ip = libisl.isl_printer_to_str(Context()) #create string printer
         ip = libisl.isl_printer_print_set(ip, bset) #print set to printer 
         string = libisl.isl_printer_get_str(ip)   #get string from printer
+        string = str(string)
         print(string)
-        return bset
+        return string
+    
+    
+    def from_isl(self, bset):
+        '''takes basic set in isl form and puts back into python version of polyhedron
+        isl example code gives idl form as:
+            "{[i] : exists (a : i = 2a and i >= 10 and i <= 42)}");'''
+        
+        poly = 0
+        return poly
 
-empty = eq(1, 1)
+empty = eq(1,1)
 
 
 universe = Polyhedron()