[TIKA-3207] Invalid language code in TesseractOCRConfig

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 1.24.1
• Fix Version/s: 1.25
• Component/s: ocr
• Assignee: Tim Allison
• Reporter: Daniel Smyda
• Created: 08/Oct/20 21:52
• Updated: 09/Oct/20 16:39
• Resolved: 09/Oct/20 15:56

Description

Some language packs available on Tesseract's github 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.

    /**
     * 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;
    }

What is the reason behind validating language options?

Either way, I'd be more than happy to supply a patch. Thank you.

Issue Links

• is related to: TIKA-2231 Invalid language code exception