text: # Copyright 2018 Michael DeHaan LLC, <michael@michaeldehaan.net>
  # 
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #    http://www.apache.org/licenses/LICENSE-2.0
  # 
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  from opsmop.core.template import Template
  from opsmop.lookups.lookup import Lookup
  
  class Eval(Lookup):
  
      """
      when=Eval("a > b")
      """
  
      def __init__(self, expr):
          super().__init__()
          self.expr = expr
  
      def evaluate(self, resource):
          return Template.native_eval(self.expr, resource)
  
      def __str__(self):
          return "Eval: <'%s'>" % self.expr
  