Replace english digit with persian digit in String except URL's

Question

I wrote a custom TextView for persian String, this TextView should replace english digit's to persian digit's

public class PersianTextView extends TextView {

    public PersianTextView(Context context) {
        super(context);
    }

    public PersianTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public PersianTextView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @Override
    public void setText(CharSequence text, BufferType type) {
        String t = text.toString();
        t = t.replaceAll("0", "۰");
        t = t.replaceAll("1", "۱");
        t = t.replaceAll("2", "۲");
        t = t.replaceAll("3", "۳");
        t = t.replaceAll("4", "۴");
        t = t.replaceAll("5", "۵");
        t = t.replaceAll("6", "۶");
        t = t.replaceAll("7", "۷");
        t = t.replaceAll("8", "۸");
        t = t.replaceAll("9", "۹");
        super.setText((CharSequence)t, type);
    }
}

this View work correctly, but if i set a text from HTML, the links which contain english digits will not show as link! what is the easiest way to solve problem?

Answer 1

One needs in some form do pattern matching on links.

private static final Pattern DIGIT_OR_LINK_PATTERN =
    Pattern.compile("(\\d|https?:[\\w_/+%?=&.]+)");
// Pattern:          (dig|link                 )

private static final Map<String, String> PERSIAN_DIGITS = new HashMap<>();
static {
   PERSIAN_DIGITS.put("0", "۰");
   PERSIAN_DIGITS.put("1", "۱");
   PERSIAN_DIGITS.put("2", "۲");
   PERSIAN_DIGITS.put("3", "۳");
   PERSIAN_DIGITS.put("4", "۴");
   PERSIAN_DIGITS.put("5", "۵");
   PERSIAN_DIGITS.put("6", "۶");
   PERSIAN_DIGITS.put("7", "۷");
   PERSIAN_DIGITS.put("8", "۸");
   PERSIAN_DIGITS.put("9", "۹");
}

public static String persianDigits(String s) {
    StringBuffer sb = new StringBuffer();
    Matcher m = DIGIT_OR_LINK_PATTERN.matcher(s);
    while (m.find()) {
        String t = m.group(1);
        if (t.length() == 1) {
            // Digit.
            t = PERSIAN_DIGITS.get(t);
        }
        m.appendReplacement(sb, t);
    }
    m.appendTail(sb);
    return sb.toString();
}

P.S.

Depending on what text, it might be better to only replace digits outside HTML tags, that is between > and <.

private static final Pattern DIGIT_OR_LINK_PATTERN =
    Pattern.compile("(\\d|<[^>]*>)",
        Pattern.DOTALL|Pattern.MULTILINE);