Mercurial > public > mercurial-scm > hg
comparison mercurial/utils/stringutil.py @ 40684:e6c9ef5e11a0
match: provide and use a quick way to escape a single byte
The previous function has a lot of overhead (including being a function). In
the `_globre` case, we always escape a single byte. So we provide a dictionary
dedicated to this use case. We directly use the dictionary to avoid a function
call, these are expensive in Python.
Again, this raise a very significant performance gain:
Before: ! wall 0.059793 comb 0.060000 user 0.060000 sys 0.000000 (median of 100)
After: ! wall 0.020390 comb 0.020000 user 0.020000 sys 0.000000 (median of 146)
Total improvement for the full series:
Before: ! wall 0.153153 comb 0.150000 user 0.150000 sys 0.000000 (median of 66)
After: ! wall 0.020390 comb 0.020000 user 0.020000 sys 0.000000 (median of 146)
| author | Boris Feld <boris.feld@octobus.net> |
|---|---|
| date | Mon, 19 Nov 2018 18:54:44 +0000 |
| parents | be57c7019c70 |
| children | 2372284d9457 |
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| 40683:d7936a9dad47 | 40684:e6c9ef5e11a0 |
|---|---|
| 26 | 26 |
| 27 # regex special chars pulled from https://bugs.python.org/issue29995 | 27 # regex special chars pulled from https://bugs.python.org/issue29995 |
| 28 # which was part of Python 3.7. | 28 # which was part of Python 3.7. |
| 29 _respecial = pycompat.bytestr(b'()[]{}?*+-|^$\\.&~# \t\n\r\v\f') | 29 _respecial = pycompat.bytestr(b'()[]{}?*+-|^$\\.&~# \t\n\r\v\f') |
| 30 _regexescapemap = {ord(i): (b'\\' + i).decode('latin1') for i in _respecial} | 30 _regexescapemap = {ord(i): (b'\\' + i).decode('latin1') for i in _respecial} |
| 31 regexbytesescapemap = {i: (b'\\' + i) for i in _respecial} | |
| 31 | 32 |
| 32 def reescape(pat): | 33 def reescape(pat): |
| 33 """Drop-in replacement for re.escape.""" | 34 """Drop-in replacement for re.escape.""" |
| 34 # NOTE: it is intentional that this works on unicodes and not | 35 # NOTE: it is intentional that this works on unicodes and not |
| 35 # bytes, as it's only possible to do the escaping with | 36 # bytes, as it's only possible to do the escaping with |