Find a way if NFC Passport have RTL/LTR embedded locale details

[rjmangubat23]

Current Behaviour

Force app to define if Scanner uses RTL/LTR via nfcLocale in ScannerOptions

Expected Behaviour

Find a way if NFC Passport have RTL/LTR embedded locale details

[typelogic]

The e-passport's human-readable personal details content data structure and encoding is via ASN.1/BER TLV; Unicode/UTF-8. There is no dedicated field in the ICAO spec for RTL/LTR directionality. The determination of directionality whether a displayable string is right-to-left or left-to-right can be deduced via the string content itself.

Since Unicode / UTF-8 is used in the encoding of human-readable contents using national characters, therefore the content string itself can be used for the determination of directionality. Using Java's native support for Unicode:

/**
 * Determine if String s is right-to-left or RTL.
 * Example of RTL languages: Arabic, Hebrew, etc
 */
private boolean isRTL(String s) {
    for (int i = 0; i < s.length(); i++) {
        byte d = Character.getDirectionality(s.charAt(i));
        if (d == Character.DIRECTIONALITY_RIGHT_TO_LEFT ||
            d == Character.DIRECTIONALITY_RIGHT_TO_LEFT_ARABIC ||
            d == Character.DIRECTIONALITY_RIGHT_TO_LEFT_EMBEDDING ||
            d == Character.DIRECTIONALITY_RIGHT_TO_LEFT_OVERRIDE
        ) {
            return true;
        }
    }

    return false;
}

[rjmangubat23]

okay thank you closing this issue as current solution is proper workaround.