[lsb@lsb.org: [EAI] (summary) display of RightToLeft chars in localparts and hostnames]

[Soobok Lee]

On Thu, Dec 07, 2006 at 10:12:31AM +0100, Harald Alvestrand wrote:
> I suppose it's possible to execute the whole bidi algorithm of UAX#9 and 
> re-code the result as some kind of "normalized RTL". Is there a 
> normalization algorithm for bidi in Unicode?

http://www.unicode.org/reports/tr9/BidiReferenceJava/

bidi.getReordering() seems to exist for such purpose, though
I am not sure.

(excerpts from BidiReferenceTest.java.txt)
  /**
     * Run the BidiReference algorithm over the string using the current character to direction code mapping.
     */
    void runSample(String str) {
        try {
            byte[] codes = charmap.getCodes(str);

            BidiReference bidi = new BidiReference(codes, baseDirection);

            int[] reorder = bidi.getReordering(new int[] { codes.length });

            writer.println("base level: " + bidi.getBaseLevel() + (baseDirection != -1 ? " (forced)" : ""));

            // output original text
            for (int i = 0; i < str.length(); ++i) {
                displayChar(str.charAt(i));
            }
            writer.println();

            // output visually ordered text
            for (int i = 0; i < str.length(); ++i) {
                displayChar(str.charAt(reorder[i]));
            }
            writer.println();
        }
        catch (Exception e) {
            writer.println(e);
        }
        writer.println();
    }