view i18n/polib.LICENSE @ 28492:837f1c437d58

changelog: lazily parse date/extra field

This is probably the most complicated patch in the parsing
refactor.

Because the date and extras are encoded in the same field, we
stuff the entire field into a dedicated variable and add a
property for accessing the sub-components of each. There is
some duplicated code here. But the code is relatively simple,
so it shouldn't be a big deal.

We see revset performance wins across the board:

author(mpm)
0.896565
0.876713
0.822961

desc(bug)
0.887169
0.895514
0.847054

date(2015)
0.878797
0.820987
0.811613

extra(rebase_source)
0.865446
0.823811
0.797756

author(mpm) or author(greg)
1.801832
1.784160
1.668172

author(mpm) or desc(bug)
1.812438
1.822756
1.677608

date(2015) or branch(default)
0.968276
0.910981
0.896032

author(mpm) or desc(bug) or date(2015) or extra(rebase_source)
3.656193
3.516788
3.265024

We see a speed-up on revsets accessing date and extras because the new
parsing code only parses what you access. Even though they are stored
the same text field, we avoid parsing dates when accessing extras and
vice-versa.

But strangely revsets accessing both date and extras appeared to speed
up as well! I'm not sure if this is due to refactoring the parsing
code or due to an optimization in revsets. You can't argue with the
results!

copyright (c) 2006-2010 David JEAN LOUIS

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.