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annotate piecrust/events.py @ 381:4c9eab0e283b

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data: Fix problems with using non-existing metadata on a linked page. The page data wrapper now has supports for loader to raise a custom exception to declare that they can't return a value after all (this is especially useful for the wildcard loader). The returned value, if any, is also now cached properly.
author Ludovic Chabant <ludovic@chabant.com>
date Sun, 10 May 2015 00:37:28 -0700
parents f485ba500df3
children f070a4fc033c
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f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
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2 class Event(object):
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3 def __init__(self):
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4 self._handlers = []
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6 def __iadd__(self, handler):
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7 self._handlers.append(handler)
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8 return self
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10 def __isub__(self, handler):
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11 self._handlers.remove(handler)
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12 return self
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14 def fire(self, *args, **kwargs):
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15 # Make a copy of the handlers list in case some handler removes
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16 # itself while executing.
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17 handlers = list(self._handlers)
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18 for handler in handlers:
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19 handler(*args, **kwargs)
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