[jira] [Comment Edited] (TIKA-3207) Invalid language code in TesseractOCRConfig

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[jira] [Comment Edited] (TIKA-3207) Invalid language code in TesseractOCRConfig

Nicholas DiPiazza (Jira)

    [ https://issues.apache.org/jira/browse/TIKA-3207?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17210490#comment-17210490 ]

Daniel Smyda edited comment on TIKA-3207 at 10/8/20, 10:20 PM:
---------------------------------------------------------------

FYI, the tesseract executable itself doesn't seem to validate the language pack input.

!tesseract_exe.PNG!

It seems like the underscores may just be convention for the official language packs.


was (Author: dsmyda):
FYI, the tesseract executable itself doesn't seem to validate the language pack input.

!tesseract_exe.PNG!

> Invalid language code in TesseractOCRConfig
> -------------------------------------------
>
>                 Key: TIKA-3207
>                 URL: https://issues.apache.org/jira/browse/TIKA-3207
>             Project: Tika
>          Issue Type: Bug
>          Components: ocr
>    Affects Versions: 1.24.1
>            Reporter: Daniel Smyda
>            Priority: Minor
>         Attachments: tesseract_exe.PNG
>
>
> Some language packs available on Tesseract's [github|https://github.com/tesseract-ocr/tessdata] support vertical orientations of Chinese (chi_sim_vert and chi_tra_vert). Trying to specify them via TesseractOCRConfig.setLanguage(String language) results in an exception because the regex is not expecting another underscore in the name.
> {code:java}
>     /**
>      * Set tesseract language dictionary to be used. Default is "eng".    
>      * Multiple languages may be specified, separated by plus characters.    
>      * e.g. "chi_tra+chi_sim"
>      */
>     public void setLanguage(String language) {
>         if (!language.matches("([a-zA-Z]{3}(_[a-zA-Z]{3,4})?(\\+?))+")
>                 || language.endsWith("+")) {
>             throw new IllegalArgumentException("Invalid language code");
>         }
>         this.language = language;
>     }
> {code}
> What is the reason behind validating language options?
> Either way, I'd be more than happy to supply a patch. Thank you.



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