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List:       kde-core-devel
Subject:    Re: Review Request: Switch implementation of formatDate() and
From:       "John Layt" <johnlayt () googlemail ! com>
Date:       2009-08-17 16:11:02
Message-ID: 20090817161102.8725.70066 () localhost
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This is an automatically generated e-mail. To reply, visit:
http://reviewboard.kde.org/r/1285/
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(Updated 2009-08-17 16:11:02.234419)


Review request for kdelibs.


Changes
-------

Bump.  Any comments?  I need to commit this so I can put my Plasma Clock/Calendar changes up for review.  \
If no response I'll commit Tuesday.


Summary (updated)
-------

[Bump.  Any comments?  I need to commit this so I can put my Plasma Clock/Calendar changes up for review. \
If no response I'll commit Tuesday.]

This review request is more for the refactoring model to see if there is a scenario I have missed, rather \
than for the code which is mostly a cleaned-up copy-and-paste.

Currently the KCalendarSystem implementations of formatDate() and readDate() point to the KLocale \
implementations.  The problem with this is that the KLocale implementations in turn point to the global \
calendar when obtaining date components like month name or year.  This is fine when you only ever show \
the global calendar, but if you want to show a different calendar at the same time, e.g. the Hebrew \
calendar alongside the global Gregorian, then calling KCalendarSystem::formatDate() on the Hebrew \
calendar returns the Gregorian date and not the Hebrew date as expected.  There is a workaround to this \
by creating a new KLocale instance, creating the new KCalendarSystem using this and pointing the KLocale \
back at the new KCalendarSystem.  This however is an ugly hack and we shouldn't expect the app programmer \
to know to do this.  The app programmer would expect they can create a new KCalendarSystem instance and \
have the correct dates returned.  Only if they want dates formatted in a different format than the global \
format should they have to create a new KLocale first.

The solution is to reverse the situation by moving the formatDate() and readDate() implementations from \
KLocale into KCalendarSystem, with the KLocale implementations pointing to its internal calendar instance \
for formatDate() and readDate(), and KCalendarSystem using its correct internal date component routines \
and pointing back to KLocale only to get the layout formats.  Another advantage to this model is that any \
calendar system that needs non-standard date formatting rules can now override the formatDate() directly \
without adding complexity to the standard routines.

A couple of code clean-ups and bug-fixes are included, especially around FancyDate format and date \
validity checking.


Diffs
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  trunk/KDE/kdelibs/kdecore/date/kcalendarsystem.h 1010188 
  trunk/KDE/kdelibs/kdecore/date/kcalendarsystem.cpp 1010188 
  trunk/KDE/kdelibs/kdecore/date/kcalendarsystemhebrew.cpp 1010188 
  trunk/KDE/kdelibs/kdecore/localization/klocale.cpp 1010188 

Diff: http://reviewboard.kde.org/r/1285/diff


Testing
-------

All current klocaletest unit test cases for formatDaet(), formatDateTime(), readDate(), and \
readDateTime() pass the same as they did before the changes.

I have implemented support in the plasma calendar widget to allow the user to select what calendar system \
to display.  Without this change the wrong dates are displayed/read.  With these changes the correct \
dates are displayed/read.


Thanks,

John


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