implement callable interface for evaluating a specification

stl/ast.py

@@ -1,11 +1,12 @@
 # -*- coding: utf-8 -*-
-
 from collections import deque, namedtuple
 from functools import lru_cache
 
 import funcy as fn
 from lenses import lens, bind
 
+import stl
+
 
 def flatten_binary(phi, op, dropT, shortT):
     def f(x):
@@ -47,6 +48,9 @@ class AST(object):
 
         return phi
 
+    def __call__(self, trace, time):
+        return stl.pointwise_sat(self)(trace, time)
+
     @property
     def children(self):
         return tuple()