Package lepl :: Package matchers :: Module monitor
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Source Code for Module lepl.matchers.monitor

 1   
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12  # The Original Code is LEPL (http://www.acooke.org/lepl) 
13  # The Initial Developer of the Original Code is Andrew Cooke. 
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29   
30  ''' 
31  Matchers that interact with monitors. 
32  ''' 
33   
34  from lepl.matchers.core import OperatorMatcher 
35  from lepl.core.trace import _TraceStack 
36  from lepl.core.parser import tagged 
37 38 39 # pylint: disable-msg=E1101, W0212 40 -class Trace(OperatorMatcher):
41 ''' 42 Enable trace logging for the sub-matcher. 43 ''' 44
45 - def __init__(self, matcher, trace=True):
46 super(Trace, self).__init__() 47 self._arg(matcher=matcher) 48 self._karg(trace=trace) 49 self.monitor_class = _TraceStack
50 51 @tagged
52 - def _match(self, stream):
53 ''' 54 Attempt to match the stream. 55 ''' 56 try: 57 generator = self.matcher._match(stream) 58 while True: 59 yield (yield generator) 60 except StopIteration: 61 pass
62
63 - def on_push(self, monitor):
64 ''' 65 On entering, switch monitor on. 66 ''' 67 monitor.switch(1 if self.trace else -1)
68
69 - def on_pop(self, monitor):
70 ''' 71 On leaving, switch monitor off. 72 ''' 73 monitor.switch(-1 if self.trace else 1)
74