https://bugzilla.wikimedia.org/show_bug.cgi?id=17766
--- Comment #22 from Volker Haas <volker.h...@pediapress.com> 2011-08-05
09:39:29 UTC ---
I investigated the 'nukta issue'.
Some preliminary remarks:
We are using a python library which implements the bidi algorithm. This
algorithm basically reorders characters from their logical (the "direction" of
storage) to their visual ordering. The library uses the fribidi c library.
Details can be found at [1]
After the tests I have done, I believe the fribidi library screws up when
reordering:
word investigated:
חַיְפַא
logical ordering (this is how the string is stored)
ח 1495
1463
י 1497
1456
פ 1508
1463
א 1488
ERRONEOUS transformation by fribidi
א 1488
פ 1508
1463
י 1497
1456
ח 1495
1463
correct transformation (manually transformed):
א 1488
1463
פ 1508
1456
י 1497
1463
ח 1495
I checked the manual transformation in the PDF and the result is as expected
(same as in the browser).
Minimal example in python:
first install pyfribidi: easy_install pyfribidi
the run python (or ipython):
----
In [35]: import pyfribidi2
In [36]: text = unicode('חַיְפַא', 'utf-8')
In [37]: bidi_trans = lambda t: pyfribidi2.log2vis(t,
base_direction=pyfribidi2.RTL)
In [38]: for c in bidi_trans(text): print c, ord(c)
....:
א 1488
פ 1508
1463
י 1497
1456
ח 1495
1463
----
To me it looks as if the fribidi library needs to be fixed. Help is welcome ;)
[1] http://pypi.python.org/pypi/pyfribidi/0.10.0
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