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https://issues.apache.org/jira/browse/PDFBOX-2252?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14906851#comment-14906851
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Maruan Sahyoun commented on PDFBOX-2252:
----------------------------------------
[~AndreasMeier] I uploaded a text file for you where the output for
Characters.isMirrored() differs from the MIRRORING_PATTERN_ARRAY. Maybe you can
have a look at it if that could be valid as this was quickly generated from
{code}
Pattern p = Pattern.compile(MIRRORING_PATTERN_ARRAY);
for (int i = 0; i< Character.MAX_CODE_POINT; i++)
{
if (Character.isValidCodePoint(i))
{
Matcher m = p.matcher(new String(Character.toChars(i)));
if (Character.isMirrored(i) || m.matches())
{
if (Character.isMirrored(i) == true && m.matches() == false ||
Character.isMirrored(i) == false && m.matches() == true)
{
System.out.printf("Character %s isMirrored %s matches pattern
%s%n",new String(Character.toChars(i)), Character.isMirrored(i), m.matches());
}
}
}
}
{code}
to get an idea of possible differences.
> PDFTextStripper has problem with documents with mixed language directions
> -------------------------------------------------------------------------
>
> Key: PDFBOX-2252
> URL: https://issues.apache.org/jira/browse/PDFBOX-2252
> Project: PDFBox
> Issue Type: Bug
> Components: Text extraction
> Affects Versions: 1.8.6, 2.0.0
> Reporter: Amir
> Assignee: Maruan Sahyoun
> Priority: Critical
> Fix For: 2.1.0
>
> Attachments: BidiMirroring.txt, IsMirroredDeviations.txt,
> PDFTextStripper.java.patch, PDFTextStripper.java.patch, atest.pdf,
> overlap.jpg, test.pdf, wikipedia_dl_lyric_test.pdf
>
>
> When the input document of PDFTextStripper is a combination of right-to-left
> and left-to-right languages, the output characters of one language is
> reversed.
> A sample bilingual pdf document is attached.
> PDFTextStripper has a variable "isRtlDominant" in "writePage" function, which
> is defined as follows: boolean isRtlDominant = rtlCount > ltrCount;
> This class clearly count the number of rtl characters and decide if the whole
> content should be revered or not. It's not true, it must operate on each
> word, not the whole document.
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