Source Code for Module gavo.grammars.dictlistgrammar

 1  """ 
 2  A (quite trivial) grammar that iterates over lists of dicts. 
 3  """ 
 4   
 5  #c Copyright 2008-2019, the GAVO project 
 6  #c 
 7  #c This program is free software, covered by the GNU GPL.  See the 
 8  #c COPYING file in the source distribution. 
 9   
10   
11  from gavo import base 
12  from gavo.grammars.common import Grammar, RowIterator 
13   
14   
15 -class ListIterator(RowIterator): 
16 -        def __init__(self, *args, **kwargs): 
17                  RowIterator.__init__(self, *args, **kwargs) 
18                  self.recNo = 0 
19                  if self.grammar.asPars: 
20                          self.sourceRow = self.sourceToken[0] 
21   
22 -        def _iterRows(self): 
23                  if self.grammar.asPars: 
24                          return 
25                  self.recNo = 1 
26                  for rec in self.sourceToken: 
27                          res = rec.copy() 
28                          yield res 
29                          self.recNo += 1 
30   
31 -        def getLocator(self): 
32                  return "List, index=%d"%self.recNo 
33   
34   
35 -class DictlistGrammar(Grammar): 
36          """A grammar that "parses" from lists of dicts. 
37   
38          Actually, it will just return the dicts as they are passed.  This is 
39          mostly useful internally, though it might come in handy in custom code. 
40          """ 
41          name_ = "dictlistGrammar" 
42          rowIterator = ListIterator 
43   
44          _asPars = base.BooleanAttribute("asPars", default=False, description= 
45                  "Just return the first item of the list as parameters row and exit?") 
46