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  • Committer: Mark Hammond
  • Date: 2009-01-12 01:55:34 UTC
  • mto: (3995.8.2 prepare-1.12)
  • mto: This revision was merged to the branch mainline in revision 4007.
  • Revision ID: mhammond@skippinet.com.au-20090112015534-yfxg50p7mpds9j4v
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bzrlib/cache_utf8.py
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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# TODO: Some kind of command-line display of revision properties:
 
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# TODO: Some kind of command-line display of revision properties: 
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# perhaps show them in log -v and allow them as options to the commit command.
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"""Some functions to enable caching the conversion between unicode to utf8"""
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import codecs
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_utf8_encode = codecs.utf_8_encode
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_utf8_decode = codecs.utf_8_decode
 
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_utf8_encode = codecs.getencoder("utf-8")
 
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_utf8_decode = codecs.getdecoder("utf-8")
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def _utf8_decode_with_None(bytestring, _utf8_decode=_utf8_decode):
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    """wrap _utf8_decode to support None->None for optional strings.
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    """Take this unicode revision id, and get a unicode version"""
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    # If the key is in the cache try/KeyError is 50% faster than
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    # val = dict.get(key), if val is None:
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    # On jam's machine the difference is
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    # try/KeyError:  900ms
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    #      if None: 1250ms
 
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    # On jam's machine the difference is 
 
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    # try/KeyError:  900ms 
 
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    #      if None: 1250ms 
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    # Since these are primarily used when iterating over a knit entry
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    # *most* of the time the key will already be in the cache, so use the
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    # fast path