Mercurial > hg
annotate mercurial/py3kcompat.py @ 26402:05871262acd5
treemanifest: rework lazy-copying code (issue4840)
The old lazy-copy code formed a chain of copied manifests with each
copy. Under typical operation, the stack never got more than a couple
of manifests deep and was fine. Under conditions like hgsubversion or
convert, the stack could get hundreds of manifests deep, and
eventually overflow the recursion limit for Python. I was able to
consistently reproduce this by converting an hgsubversion clone of
svn's history to treemanifests.
This may result in fewer manifests staying in memory during operations
like convert when treemanifests are in use, and should make those
operations faster since there will be significantly fewer noop
function calls going on.
A previous attempt (never mailed) of mine to fix this problem tried to
simply have all treemanifests only have a loadfunc - that caused
somewhat weird problems because the gettext() callable passed into
read() wasn't idempotent, so the easy solution is to have a loadfunc
and a copyfunc.
author | Augie Fackler <augie@google.com> |
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date | Fri, 25 Sep 2015 22:54:46 -0400 |
parents | a7a9d84f5e4a |
children | 5bfd01a3c2a9 |
rev | line source |
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1 # py3kcompat.py - compatibility definitions for running hg in py3k |
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2 # |
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3 # Copyright 2010 Renato Cunha <renatoc@gmail.com> |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
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6 # GNU General Public License version 2 or any later version. |
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7 |
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8 import builtins |
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9 |
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10 from numbers import Number |
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11 |
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12 def bytesformatter(format, args): |
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13 '''Custom implementation of a formatter for bytestrings. |
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14 |
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15 This function currently relies on the string formatter to do the |
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16 formatting and always returns bytes objects. |
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17 |
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18 >>> bytesformatter(20, 10) |
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19 0 |
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20 >>> bytesformatter('unicode %s, %s!', ('string', 'foo')) |
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21 b'unicode string, foo!' |
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22 >>> bytesformatter(b'test %s', 'me') |
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23 b'test me' |
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24 >>> bytesformatter('test %s', 'me') |
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25 b'test me' |
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26 >>> bytesformatter(b'test %s', b'me') |
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27 b'test me' |
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28 >>> bytesformatter('test %s', b'me') |
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29 b'test me' |
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30 >>> bytesformatter('test %d: %s', (1, b'result')) |
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31 b'test 1: result' |
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32 ''' |
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33 # The current implementation just converts from bytes to unicode, do |
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34 # what's needed and then convert the results back to bytes. |
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35 # Another alternative is to use the Python C API implementation. |
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36 if isinstance(format, Number): |
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37 # If the fixer erroneously passes a number remainder operation to |
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38 # bytesformatter, we just return the correct operation |
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39 return format % args |
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40 if isinstance(format, bytes): |
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41 format = format.decode('utf-8', 'surrogateescape') |
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42 if isinstance(args, bytes): |
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43 args = args.decode('utf-8', 'surrogateescape') |
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44 if isinstance(args, tuple): |
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45 newargs = [] |
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46 for arg in args: |
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47 if isinstance(arg, bytes): |
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48 arg = arg.decode('utf-8', 'surrogateescape') |
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49 newargs.append(arg) |
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50 args = tuple(newargs) |
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51 ret = format % args |
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52 return ret.encode('utf-8', 'surrogateescape') |
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53 builtins.bytesformatter = bytesformatter |
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54 |
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55 origord = builtins.ord |
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56 def fakeord(char): |
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57 if isinstance(char, int): |
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58 return char |
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59 return origord(char) |
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60 builtins.ord = fakeord |
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61 |
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62 if __name__ == '__main__': |
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63 import doctest |
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64 doctest.testmod() |
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65 |