Source Code for Module ZenUtils.ZenTales

 1  ########################################################################### 
 2  # 
 3  # This program is part of Zenoss Core, an open source monitoring platform. 
 4  # Copyright (C) 2007, Zenoss Inc. 
 5  # 
 6  # This program is free software; you can redistribute it and/or modify it 
 7  # under the terms of the GNU General Public License version 2 as published by 
 8  # the Free Software Foundation. 
 9  # 
10  # For complete information please visit: http://www.zenoss.com/oss/ 
11  # 
12  ########################################################################### 
13   
14  from Products.PageTemplates.Expressions import getEngine 
15  from DateTime import DateTime 
16   
17  _compiled = {} 
18   
19 -def talesEvalStr(expression, context, extra=None): 
20      return talesEval('string:%s' % expression, context, extra) 
21   
22   
23 -def talesEval(express, context, extra=None): 
24      """Perform a TALES eval on the express using context. 
25      """ 
26      compiled = talesCompile(express) 
27      contextDict = { 'here':context,  
28                      'nothing':None, 
29                      'now': DateTime(), 
30                      } 
31      if isinstance(extra, dict): 
32          contextDict.update(extra) 
33      res = compiled(getEngine().getContext(contextDict)) 
34      if isinstance(res, Exception): 
35          raise res 
36      return res 
37   
38 -def talesCompile(express): 
39      compiled = _compiled.get(express, None) 
40      if not compiled: 
41          _compiled[express] = compiled = getEngine().compile(express) 
42      return compiled 
43