[jira] [Commented] (PDFBOX-4531) Extraction of Arabic PDF has incorrect ordering of normalized ligatures

["Mohamed M NourElDin (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PDFBOX-4531?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17690852#comment-17690852 ] 

Mohamed M NourElDin commented on PDFBOX-4531:
---------------------------------------------

Hi Team,
This is my first time contributing to this project. I would like to fix Arabic related issues here.

I have just created [PR#154 PDFBOX-4531: Reverse the order of decomposed Arabic letters|https://github.com/apache/pdfbox/pull/154] to extract the letters in the correct order when using 
{{java -jar ./app/target/pdfbox-app-3.0.0-SNAPSHOT.jar export:text -sort -i filename.pdf}}

I know that there may be other methods that are not covered in my commit but I would like to have an initial review first before applying my fixes to those methods as well.
Thanks

> 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
>            Priority: Major
>              Labels: Arabic, regression
>         Attachments: PDFBOX-4531-reduced.pdf, RAND_PE122z1.arabic.pdf
>
>
> 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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