From: Philipp Hagemeister <phihag@phihag.de>
Date: Wed, 21 Aug 2013 02:06:46 +0000 (+0200)
Subject: Cache suitable regular expressions
X-Git-Url: http://git.oshgnacknak.de/?a=commitdiff_plain;h=79cb25776f46e0b9b1e95052fbd84a59440fa34f;p=youtube-dl

Cache suitable regular expressions

This speeds up TestAllURLsMatching.test_no_duplicates by about 8000% at the cost of minimal memory overhead.
---

diff --git a/youtube_dl/extractor/common.py b/youtube_dl/extractor/common.py
index da50abfc1..8009c2d85 100644
--- a/youtube_dl/extractor/common.py
+++ b/youtube_dl/extractor/common.py
@@ -77,7 +77,13 @@ class InfoExtractor(object):
     @classmethod
     def suitable(cls, url):
         """Receives a URL and returns True if suitable for this IE."""
-        return re.match(cls._VALID_URL, url) is not None
+
+        # This does not use has/getattr intentionally - we want to know whether
+        # we have cached the regexp for *this* class, whereas getattr would also
+        # match the superclass
+        if '_VALID_URL_RE' not in cls.__dict__:
+            cls._VALID_URL_RE = re.compile(cls._VALID_URL)
+        return cls._VALID_URL_RE.match(url) is not None
 
     @classmethod
     def working(cls):