Tilman Hausherr created PDFBOX-4531:
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Summary: Extraction of Arabic PDF has incorrect ordering of
normalized ligatures
Key: PDFBOX-4531
URL: https://issues.apache.org/jira/browse/PDFBOX-4531
Project: PDFBox
Issue Type: Bug
Components: Text extraction
Affects Versions: 2.0.15
Reporter: Tilman Hausherr
As reported by Elias Peterson in the mailing list:
{quote}
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
...
{quote}
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