arabicligaturizer.java

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        if ((options & DIGITS_MASK) != 0) {
            char digitBase = '\u0030'; // European digits
            switch (options & DIGIT_TYPE_MASK) {
                case DIGIT_TYPE_AN:
                    digitBase = '\u0660';  // Arabic-Indic digits
                    break;
                    
                case DIGIT_TYPE_AN_EXTENDED:
                    digitBase = '\u06f0';  // Eastern Arabic-Indic digits (Persian and Urdu)
                    break;
                    
                default:
                    break;
            }
            
            switch (options & DIGITS_MASK) {
                case DIGITS_EN2AN: {
                    int digitDelta = digitBase - '\u0030';
                    for (int i = offset; i < limit; ++i) {
                        char ch = text[i];
                        if (ch <= '\u0039' && ch >= '\u0030') {
                            text[i] += digitDelta;
                        }
                    }
                }
                break;
                
                case DIGITS_AN2EN: {
                    char digitTop = (char)(digitBase + 9);
                    int digitDelta = '\u0030' - digitBase;
                    for (int i = offset; i < limit; ++i) {
                        char ch = text[i];
                        if (ch <= digitTop && ch >= digitBase) {
                            text[i] += digitDelta;
                        }
                    }
                }
                break;
                
                case DIGITS_EN2AN_INIT_LR:
                    shapeToArabicDigitsWithContext(text, 0, length, digitBase, false);
                    break;
                    
                case DIGITS_EN2AN_INIT_AL:
                    shapeToArabicDigitsWithContext(text, 0, length, digitBase, true);
                    break;
                    
                default:
                    break;
            }
        }
    }
    
    static void shapeToArabicDigitsWithContext(char[] dest, int start, int length, char digitBase,  boolean lastStrongWasAL) {
        digitBase -= '0'; // move common adjustment out of loop
 
        int limit = start + length;
        for(int i = start; i < limit; ++i) {
            char ch = dest[i];
            switch (BidiOrder.getDirection(ch)) {
            case BidiOrder.L:
            case BidiOrder.R:
                lastStrongWasAL = false;
                break;
            case BidiOrder.AL:
                lastStrongWasAL = true;
                break;
            case BidiOrder.EN:
                if (lastStrongWasAL && ch <= '\u0039') {
                    dest[i] = (char)(ch + digitBase);
                }
                break;
            default:
                break;
            }
        }
    }

    private static final char ALEF = 0x0627;
    private static final char ALEFHAMZA = 0x0623;
    private static final char ALEFHAMZABELOW = 0x0625;
    private static final char ALEFMADDA = 0x0622;
    private static final char LAM = 0x0644;
    private static final char HAMZA = 0x0621;
    private static final char TATWEEL = 0x0640;
    private static final char ZWJ = 0x200D;

    private static final char HAMZAABOVE = 0x0654;
    private static final char HAMZABELOW = 0x0655;

    private static final char WAWHAMZA = 0x0624;
    private static final char YEHHAMZA = 0x0626;
    private static final char WAW = 0x0648;
    private static final char ALEFMAKSURA = 0x0649;
    private static final char YEH = 0x064A;
    private static final char FARSIYEH = 0x06CC;

    private static final char SHADDA = 0x0651;
    private static final char KASRA = 0x0650;
    private static final char FATHA = 0x064E;
    private static final char DAMMA = 0x064F;
    private static final char MADDA = 0x0653;

    private static final char LAM_ALEF = 0xFEFB;
    private static final char LAM_ALEFHAMZA = 0xFEF7;
    private static final char LAM_ALEFHAMZABELOW = 0xFEF9;
    private static final char LAM_ALEFMADDA = 0xFEF5;

    private static final char chartable[][] = {
        {0x0621, 0xFE80}, /* HAMZA */
        {0x0622, 0xFE81, 0xFE82}, /* ALEF WITH MADDA ABOVE */
        {0x0623, 0xFE83, 0xFE84}, /* ALEF WITH HAMZA ABOVE */
        {0x0624, 0xFE85, 0xFE86}, /* WAW WITH HAMZA ABOVE */
        {0x0625, 0xFE87, 0xFE88}, /* ALEF WITH HAMZA BELOW */
        {0x0626, 0xFE89, 0xFE8A, 0xFE8B, 0xFE8C}, /* YEH WITH HAMZA ABOVE */
        {0x0627, 0xFE8D, 0xFE8E}, /* ALEF */
        {0x0628, 0xFE8F, 0xFE90, 0xFE91, 0xFE92}, /* BEH */
        {0x0629, 0xFE93, 0xFE94}, /* TEH MARBUTA */
        {0x062A, 0xFE95, 0xFE96, 0xFE97, 0xFE98}, /* TEH */
        {0x062B, 0xFE99, 0xFE9A, 0xFE9B, 0xFE9C}, /* THEH */
        {0x062C, 0xFE9D, 0xFE9E, 0xFE9F, 0xFEA0}, /* JEEM */
        {0x062D, 0xFEA1, 0xFEA2, 0xFEA3, 0xFEA4}, /* HAH */
        {0x062E, 0xFEA5, 0xFEA6, 0xFEA7, 0xFEA8}, /* KHAH */
        {0x062F, 0xFEA9, 0xFEAA}, /* DAL */
        {0x0630, 0xFEAB, 0xFEAC}, /* THAL */
        {0x0631, 0xFEAD, 0xFEAE}, /* REH */
        {0x0632, 0xFEAF, 0xFEB0}, /* ZAIN */
        {0x0633, 0xFEB1, 0xFEB2, 0xFEB3, 0xFEB4}, /* SEEN */
        {0x0634, 0xFEB5, 0xFEB6, 0xFEB7, 0xFEB8}, /* SHEEN */
        {0x0635, 0xFEB9, 0xFEBA, 0xFEBB, 0xFEBC}, /* SAD */
        {0x0636, 0xFEBD, 0xFEBE, 0xFEBF, 0xFEC0}, /* DAD */
        {0x0637, 0xFEC1, 0xFEC2, 0xFEC3, 0xFEC4}, /* TAH */
        {0x0638, 0xFEC5, 0xFEC6, 0xFEC7, 0xFEC8}, /* ZAH */
        {0x0639, 0xFEC9, 0xFECA, 0xFECB, 0xFECC}, /* AIN */
        {0x063A, 0xFECD, 0xFECE, 0xFECF, 0xFED0}, /* GHAIN */
        {0x0640, 0x0640, 0x0640, 0x0640, 0x0640}, /* TATWEEL */
        {0x0641, 0xFED1, 0xFED2, 0xFED3, 0xFED4}, /* FEH */
        {0x0642, 0xFED5, 0xFED6, 0xFED7, 0xFED8}, /* QAF */
        {0x0643, 0xFED9, 0xFEDA, 0xFEDB, 0xFEDC}, /* KAF */
        {0x0644, 0xFEDD, 0xFEDE, 0xFEDF, 0xFEE0}, /* LAM */
        {0x0645, 0xFEE1, 0xFEE2, 0xFEE3, 0xFEE4}, /* MEEM */
        {0x0646, 0xFEE5, 0xFEE6, 0xFEE7, 0xFEE8}, /* NOON */
        {0x0647, 0xFEE9, 0xFEEA, 0xFEEB, 0xFEEC}, /* HEH */
        {0x0648, 0xFEED, 0xFEEE}, /* WAW */
        {0x0649, 0xFEEF, 0xFEF0, 0xFBE8, 0xFBE9}, /* ALEF MAKSURA */
        {0x064A, 0xFEF1, 0xFEF2, 0xFEF3, 0xFEF4}, /* YEH */
        {0x0671, 0xFB50, 0xFB51}, /* ALEF WASLA */
        {0x0679, 0xFB66, 0xFB67, 0xFB68, 0xFB69}, /* TTEH */
        {0x067A, 0xFB5E, 0xFB5F, 0xFB60, 0xFB61}, /* TTEHEH */
        {0x067B, 0xFB52, 0xFB53, 0xFB54, 0xFB55}, /* BEEH */
        {0x067E, 0xFB56, 0xFB57, 0xFB58, 0xFB59}, /* PEH */
        {0x067F, 0xFB62, 0xFB63, 0xFB64, 0xFB65}, /* TEHEH */
        {0x0680, 0xFB5A, 0xFB5B, 0xFB5C, 0xFB5D}, /* BEHEH */
        {0x0683, 0xFB76, 0xFB77, 0xFB78, 0xFB79}, /* NYEH */
        {0x0684, 0xFB72, 0xFB73, 0xFB74, 0xFB75}, /* DYEH */
        {0x0686, 0xFB7A, 0xFB7B, 0xFB7C, 0xFB7D}, /* TCHEH */
        {0x0687, 0xFB7E, 0xFB7F, 0xFB80, 0xFB81}, /* TCHEHEH */
        {0x0688, 0xFB88, 0xFB89}, /* DDAL */
        {0x068C, 0xFB84, 0xFB85}, /* DAHAL */
        {0x068D, 0xFB82, 0xFB83}, /* DDAHAL */
        {0x068E, 0xFB86, 0xFB87}, /* DUL */
        {0x0691, 0xFB8C, 0xFB8D}, /* RREH */
        {0x0698, 0xFB8A, 0xFB8B}, /* JEH */
        {0x06A4, 0xFB6A, 0xFB6B, 0xFB6C, 0xFB6D}, /* VEH */
        {0x06A6, 0xFB6E, 0xFB6F, 0xFB70, 0xFB71}, /* PEHEH */
        {0x06A9, 0xFB8E, 0xFB8F, 0xFB90, 0xFB91}, /* KEHEH */
        {0x06AD, 0xFBD3, 0xFBD4, 0xFBD5, 0xFBD6}, /* NG */
        {0x06AF, 0xFB92, 0xFB93, 0xFB94, 0xFB95}, /* GAF */
        {0x06B1, 0xFB9A, 0xFB9B, 0xFB9C, 0xFB9D}, /* NGOEH */
        {0x06B3, 0xFB96, 0xFB97, 0xFB98, 0xFB99}, /* GUEH */
        {0x06BA, 0xFB9E, 0xFB9F}, /* NOON GHUNNA */
        {0x06BB, 0xFBA0, 0xFBA1, 0xFBA2, 0xFBA3}, /* RNOON */
        {0x06BE, 0xFBAA, 0xFBAB, 0xFBAC, 0xFBAD}, /* HEH DOACHASHMEE */
        {0x06C0, 0xFBA4, 0xFBA5}, /* HEH WITH YEH ABOVE */
        {0x06C1, 0xFBA6, 0xFBA7, 0xFBA8, 0xFBA9}, /* HEH GOAL */
        {0x06C5, 0xFBE0, 0xFBE1}, /* KIRGHIZ OE */
        {0x06C6, 0xFBD9, 0xFBDA}, /* OE */
        {0x06C7, 0xFBD7, 0xFBD8}, /* U */
        {0x06C8, 0xFBDB, 0xFBDC}, /* YU */
        {0x06C9, 0xFBE2, 0xFBE3}, /* KIRGHIZ YU */
        {0x06CB, 0xFBDE, 0xFBDF}, /* VE */
        {0x06CC, 0xFBFC, 0xFBFD, 0xFBFE, 0xFBFF}, /* FARSI YEH */
        {0x06D0, 0xFBE4, 0xFBE5, 0xFBE6, 0xFBE7}, /* E */
        {0x06D2, 0xFBAE, 0xFBAF}, /* YEH BARREE */
        {0x06D3, 0xFBB0, 0xFBB1} /* YEH BARREE WITH HAMZA ABOVE */
        };

        public static final int ar_nothing  = 0x0;
        public static final int ar_novowel = 0x1;
        public static final int ar_composedtashkeel = 0x4;
        public static final int ar_lig = 0x8;
        /**
         * Digit shaping option: Replace European digits (U+0030...U+0039) by Arabic-Indic digits.
         */
        public static final int DIGITS_EN2AN = 0x20;
        
        /**
         * Digit shaping option: Replace Arabic-Indic digits by European digits (U+0030...U+0039).
         */
        public static final int DIGITS_AN2EN = 0x40;
        
        /**
         * Digit shaping option:
         * Replace European digits (U+0030...U+0039) by Arabic-Indic digits
         * if the most recent strongly directional character
         * is an Arabic letter (its Bidi direction value is RIGHT_TO_LEFT_ARABIC).
         * The initial state at the start of the text is assumed to be not an Arabic,
         * letter, so European digits at the start of the text will not change.
         * Compare to DIGITS_ALEN2AN_INIT_AL.
         */
        public static final int DIGITS_EN2AN_INIT_LR = 0x60;
        
        /**
         * Digit shaping option:
         * Replace European digits (U+0030...U+0039) by Arabic-Indic digits
         * if the most recent strongly directional character
         * is an Arabic letter (its Bidi direction value is RIGHT_TO_LEFT_ARABIC).
         * The initial state at the start of the text is assumed to be an Arabic,
         * letter, so European digits at the start of the text will change.
         * Compare to DIGITS_ALEN2AN_INT_LR.
         */
        public static final int DIGITS_EN2AN_INIT_AL = 0x80;
        
        /** Not a valid option value. */
        private static final int DIGITS_RESERVED = 0xa0;
        
        /**
         * Bit mask for digit shaping options.
         */
        public static final int DIGITS_MASK = 0xe0;
        
        /**
         * Digit type option: Use Arabic-Indic digits (U+0660...U+0669).
         */
        public static final int DIGIT_TYPE_AN = 0;
        
        /**
         * Digit type option: Use Eastern (Extended) Arabic-Indic digits (U+06f0...U+06f9).
         */
        public static final int DIGIT_TYPE_AN_EXTENDED = 0x100;

        /**
         * Bit mask for digit type options.
         */
        public static final int DIGIT_TYPE_MASK = 0x0100; // 0x3f00?

        static class charstruct {
            char basechar;
            char mark1;               /* has to be initialized to zero */
            char vowel;
            int lignum;           /* is a ligature with lignum aditional characters */
            int numshapes = 1;
        };


}