Hi,
I've created https://issues.apache.org/jira/browse/PDFBOX-4531 and also
attached a reduced version of the problem PDF.
Please verify that these are really the two lines.
But don't expect this to be fixed soon - none of us knows Arabic and it
is extremely difficult to understand what is going on. I had one failed
attempt to produce a reduced file because it is difficult to recognize
the glyphs in different fonts (your mail / the PDF / the extraction).
This might also be similar to another (also unsolved) issue related to
Thai ligatures.
1.8.* may have worked because it used icu4j and 2.0 doesn't.
What we'd really need is people who can not only fix this, also check
the extraction of other arabic test PDFs, also keep hanging around here
to decide whether any extraction changes are regressions, improvements
or irrelevant.
Tilman
Am 30.04.2019 um 04:35 schrieb Elias Peterson:
Hello,
I think I'm seeing some issues concerning the handling of the Arabic
lam-with-alef ligature. I'm attempting to process the PDF here:
https://www.rand.org/content/dam/rand/pubs/perspectives/PE100/PE122/RAND_PE122z1.arabic.pdf
When I run the ExtractText command with 2.0.15 I get the following:
$ java -jar pdfbox-app-2.0.15.jar ExtractText -encoding UTF-8
RAND_PE122z1.arabic.pdf output.txt
$ head output.txt
C O R P O R A T I O N
منظور تحليلي
رؤى خبير بشأن قضايا السياسات اآلنية
االتفاق مع إيران
األيام التي تلي
...
The issue being with the last two lines in the above snippet where my
understanding is that the ligature لا was normalized but that the two letters
that compose it are in the wrong order. I was thinking that PDFBOX-684 sounded
similar, and running the same PDF through 1.8.16 I see the ligature is
normalized in the way I think is expected (although the interspersed
English-language words are backwards here).
$ java -jar pdfbox-app-1.8.16.jar ExtractText -encoding UTF-8
RAND_PE122z1.arabic.pdf output.txt
...
$ head output.txt
N O I T A R O P R O C
منظور تحليلي
رؤى خبير بشأن قضايا السياسات الآنية
الاتفاق مع إيران
الأيام التي تلي
...
Does this look like a regression or is there possibly something else I should
be trying? Thank you for any assistance.
--Elias Peterson
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