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

["Pavel Pisarev (JIRA)" <ji...@apache.org>]

    [ 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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