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Cache suitable regular expressions
This speeds up TestAllURLsMatching.test_no_duplicates by about 8000% at the cost of minimal memory overhead.
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@ -77,7 +77,13 @@ def __init__(self, downloader=None):
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@classmethod
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def suitable(cls, url):
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"""Receives a URL and returns True if suitable for this IE."""
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return re.match(cls._VALID_URL, url) is not None
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# This does not use has/getattr intentionally - we want to know whether
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# we have cached the regexp for *this* class, whereas getattr would also
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# match the superclass
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if '_VALID_URL_RE' not in cls.__dict__:
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cls._VALID_URL_RE = re.compile(cls._VALID_URL)
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return cls._VALID_URL_RE.match(url) is not None
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@classmethod
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def working(cls):
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