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comparison tests/test-encoding-func.py @ 33927:853574db5b12

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encoding: add fast path of from/tolocal() for ASCII strings This is micro optimization, but seems not bad since to/fromlocal() is called lots of times and isasciistr() is cheap and simple. We boldly assume that any non-ASCII characters have at least one 8-bit byte. This isn't true for some email character sets (e.g. ISO-2022-JP and UTF-7), but I believe no such encodings are used as a platform default. Shift_JIS, a major crap, is okay as it should have a leading byte in 0x80-0xff range. (with mercurial repo) $ export HGRCPATH=/dev/null HGPLAIN= $ hg log --time --config experimental.stabilization=all > /dev/null (original) time: real 7.460 secs (user 7.420+0.000 sys 0.030+0.000) time: real 7.670 secs (user 7.590+0.000 sys 0.080+0.000) time: real 7.560 secs (user 7.510+0.000 sys 0.040+0.000) (this patch) time: real 7.340 secs (user 7.260+0.000 sys 0.060+0.000) time: real 7.260 secs (user 7.210+0.000 sys 0.030+0.000) time: real 7.310 secs (user 7.260+0.000 sys 0.060+0.000)
author Yuya Nishihara <yuya@tcha.org>
date Sun, 23 Apr 2017 13:06:23 +0900
parents f4433f2713d0
children 6c119dbfd0c0
comparison
equal deleted inserted replaced
33926:f4433f2713d0 33927:853574db5b12
26 for i in range(len(s)): 26 for i in range(len(s)):
27 t = bytearray(s) 27 t = bytearray(s)
28 t[i] |= 0x80 28 t[i] |= 0x80
29 self.assertFalse(encoding.isasciistr(bytes(t))) 29 self.assertFalse(encoding.isasciistr(bytes(t)))
30 30
31 class LocalEncodingTest(unittest.TestCase):
32 def testasciifastpath(self):
33 s = b'\0' * 100
34 self.assertTrue(s is encoding.tolocal(s))
35 self.assertTrue(s is encoding.fromlocal(s))
36
31 if __name__ == '__main__': 37 if __name__ == '__main__':
32 import silenttestrunner 38 import silenttestrunner
33 silenttestrunner.main(__name__) 39 silenttestrunner.main(__name__)