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https://issues.apache.org/jira/browse/PDFBOX-3096?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14998529#comment-14998529
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Maruan Sahyoun commented on PDFBOX-3096:
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To better understand the potential issues and if that is related to Bidi or
happens because of other text extraction issues I'd like to
- know which version of PDFBox you were using for your tests
- have a sample PDF
- have a sample text extracted with a description where that text is wrong
{quote}
2. Bidi engine compliant with UBA (http://unicode.org/reports/tr9/) should be
used for resolution of the issue.
{quote}
Although we can use a different engine for Bidi support could you elaborate a
little bit where the text extraction fails **because** we are currently using
the Java (Oracle JDK) Bidi engine?
> Lack of Bidi (Arabic / Hebrew) text reordering in text extracted with PDFbox
> ----------------------------------------------------------------------------
>
> Key: PDFBOX-3096
> URL: https://issues.apache.org/jira/browse/PDFBOX-3096
> Project: PDFBox
> Issue Type: Bug
> Components: Text extraction
> Reporter: TOMER MAHLIN
> Attachments: PDFBox_HebrewExtractedText.PNG
>
>
> Rendering rules for Bidi (Arabic / Hebrew) text in regular Windows / Android
> / iOS environment and Adobe environment are different. Adobe expect text to
> appear in visual bidi layout while modern system are working with logical
> bidi layout.
> When text is extracted from PDF file it should be converted / normalized to
> logical bidi layout.
> Example:
> Assuming capital letters stand for Bidi letters.
> 1. In Adobe document you see: CBA
> 2. When you extract the content and display it in Notepad (or web browser or
> any similar tool) you will see ABC while the expectation is to see CBA.
> Assuming you have a real text with both Hebrew and English (or Arabic and
> English) characters the result display is completely ruined after text
> extraction. Moreover, even if we ignore the display and focus on text
> manipulation (search, comparison, concatenation etc.), it will fail if the
> same text authored in Notepad and extracted from PDF file are compared.
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