[jira] Commented: (PDFBOX-939) Lost whitespaces when extracting Arabic text

[Pavel Pisarev (JIRA)]

    [ 
https://issues.apache.org/jira/browse/PDFBOX-939?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12986058#action_12986058
 ] 

Pavel Pisarev commented on PDFBOX-939:
--------------------------------------

Hi Anton, 

I've checked your example and found that each arabic line lost only two final 
spaces. The reason is located in the method 
PDFTextStripper#writeLine(List<String> line, boolean isRtlDominant). 

The original source code is:
int numberOfStrings = line.size();
        if (isRtlDominant) {
            for(int i=numberOfStrings-1; i>=0; i--){
                if (i > 1)
                    writeWordSeparator();
                writeString(line.get(i));
            }
        }
        else {
            for(int i=0; i<numberOfStrings; i++){
                writeString(line.get(i));
                if (!isRtlDominant && i < numberOfStrings-1)
                    writeWordSeparator();
            }
        }

I f you change condition "if (i > 1)" to "if (i < numberOfStrings-1)" text 
extraction will be correct. I suppose this is a bug.

> Lost whitespaces when extracting Arabic text
> --------------------------------------------
>
>                 Key: PDFBOX-939
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-939
>             Project: PDFBox
>          Issue Type: Bug
>          Components: Text extraction
>    Affects Versions: 1.4.0
>            Reporter: Anton 
>         Attachments: extracted.txt, test.pdf
>
>
> I tried to extract text from an arabic PDF. Result looks good for the first 
> look, but if you look closer, you may notice that some of whitespaces is 
> missing comparing to copy/pasted text from the same PDF.
> Copy/pasted line from attached PDF:
> بعد ما اكتشف حقيقة المثلث الغامض
> Extracted text:
> بعد ما اكتشف حقيقةالمثلثالغامض
>  

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