Add islhelper.c library to handle isl constants

[linpy.git] / pypol / isl.py

diff --git a/pypol/isl.py b/pypol/isl.py
index 758fb79..f1e63dc 100644 (file)
--- a/pypol/isl.py
+++ b/pypol/isl.py
@@ -1,19 +1,34 @@
+"""
+note: for islpy
+isl format: basic set: ("{[x, y] : x >= 0 and x < 5 and y >= 0 and y < x+4 }")
+"""
 
 import ctypes, ctypes.util
 import math
 import numbers
 import operator
 import re
+import functools
+
 
 from decimal import Decimal
 from fractions import Fraction
 from functools import wraps
 
-
 libisl = ctypes.CDLL(ctypes.util.find_library('isl'))
 
 libisl.isl_printer_get_str.restype = ctypes.c_char_p
 
+def _polymorphic_method(func):
+    @functools.wraps(func)
+    def wrapper(self, other):
+        if isinstance(other, Value):
+            return func(self, other)
+        if isinstance(other, numbers.Rational):
+            other = Value(self.context, other)
+            return func(self, other)
+        raise TypeError('operand should be a Value or a Rational')
+    return wrapper
 
 class Context:
 
@@ -25,9 +40,10 @@ class Context:
     @property
     def _as_parameter_(self):
         return self._ic
-
-    def __del__(self):
-        libisl.isl_ctx_free(self)
+    
+    #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):
@@ -104,12 +120,19 @@ class Value:
             numerator = libisl.isl_val_read_from_str(context, numerator)
             denominator = str(frac.denominator).encode()
             denominator = libisl.isl_val_read_from_str(context, denominator)
-            self._iv = libisl.isl_val_div(numerator, denominator)
+            self._iv = libisl.isl_val_div(numerator, denominator)       
         return self
 
+
     @property
     def _as_parameter_(self):
         return self._iv
+    
+    def symbols(self):
+        s = set()
+        for constraint in self.constraints():
+            s.update(constraint.symbols)
+        yield from sorted(s)
 
     def __del__(self):
         libisl.isl_val_free(self)
@@ -124,40 +147,29 @@ class Value:
     @property
     def denominator(self):
         if self._denominator is None:
-            raise ValueError('not a rational number')
+            raise ValueError('not a rational number')        
         return self._denominator
 
     def __bool__(self):
         return not bool(libisl.isl_val_is_zero(self))
 
-    def _polymorphic(func):
-        @wraps(func)
-        def wrapper(self, other):
-            if isinstance(other, Value):
-                return func(self, other)
-            if isinstance(other, numbers.Rational):
-                other = Value(self.context, other)
-                return func(self, other)
-            raise TypeError('operand should be a Value or a Rational')
-        return wrapper
-
-    @_polymorphic
+    @_polymorphic_method
     def __lt__(self, other):
         return bool(libisl.isl_val_lt(self, other))
 
-    @_polymorphic
+    @_polymorphic_method
     def __le__(self, other):
         return bool(libisl.isl_val_le(self, other))
 
-    @_polymorphic
+    @_polymorphic_method
     def __gt__(self, other):
         return bool(libisl.isl_val_gt(self, other))
 
-    @_polymorphic
+    @_polymorphic_method
     def __ge__(self, other):
         return bool(libisl.isl_val_ge(self, other))
 
-    @_polymorphic
+    @_polymorphic_method
     def __eq__(self, other):
         return bool(libisl.isl_val_eq(self, other))
 
@@ -192,7 +204,7 @@ class Value:
         val = libisl.isl_val_trunc(val)
         return self.__class__(self.context, self._ptr(val))
 
-    @_polymorphic
+    @_polymorphic_method
     def __add__(self, other):
         val1 = libisl.isl_val_copy(self)
         val2 = libisl.isl_val_copy(other)
@@ -201,7 +213,7 @@ class Value:
 
     __radd__ = __add__
 
-    @_polymorphic
+    @_polymorphic_method
     def __sub__(self, other):
         val1 = libisl.isl_val_copy(self)
         val2 = libisl.isl_val_copy(other)
@@ -210,7 +222,7 @@ class Value:
 
     __rsub__ = __sub__
 
-    @_polymorphic
+    @_polymorphic_method
     def __mul__(self, other):
         val1 = libisl.isl_val_copy(self)
         val2 = libisl.isl_val_copy(other)
@@ -219,7 +231,7 @@ class Value:
 
     __rmul__ = __mul__
 
-    @_polymorphic
+    @_polymorphic_method
     def __truediv__(self, other):
         val1 = libisl.isl_val_copy(self)
         val2 = libisl.isl_val_copy(other)
@@ -246,7 +258,7 @@ class Value:
         return bool(libisl.isl_val_is_infty(self) or
                 libisl.isl_val_is_neginfty(self))
 
-    def is_nan(self):
+    def is_nan(self): 
         return bool(libisl.isl_val_is_nan(self))
 
     def __str__(self):