✏️ Editing: indic.php

<?php

class INDIC {
    /* FROM hb-ot-shape-complex-indic-private.hh */

// indic_category
    const OT_X = 0;
    const OT_C = 1;
    const OT_V = 2;
    const OT_N = 3;
    const OT_H = 4;
    const OT_ZWNJ = 5;
    const OT_ZWJ = 6;
    const OT_M = 7;  /* Matra or Dependent Vowel */
    const OT_SM = 8;
    const OT_VD = 9;
    const OT_A = 10;
    const OT_NBSP = 11;
    const OT_DOTTEDCIRCLE = 12; /* Not in the spec, but special in Uniscribe. /Very very/ special! */
    const OT_RS = 13;   /* Register Shifter, used in Khmer OT spec */
    const OT_Coeng = 14;
    const OT_Repha = 15;
    const OT_Ra = 16;   /* Not explicitly listed in the OT spec, but used in the grammar. */
    const OT_CM = 17;

// Based on indic_category used to make string to find syllables
// OT_ to string character (using e.g. OT_C from INDIC) hb-ot-shape-complex-indic-private.hh 
    public static $indic_category_char = array(
        'x',
        'C',
        'V',
        'N',
        'H',
        'Z',
        'J',
        'M',
        'S',
        'v',
        'A', /* Spec gives Andutta U+0952 as OT_A. However, testing shows that Uniscribe
         * treats U+0951..U+0952 all as OT_VD - see set_indic_properties */
        's',
        'D',
        'F', /* Register shift Khmer only */
        'G', /* Khmer only */
        'r', /* 0D4E (dot reph) only one in Malayalam */
        'R',
        'm', /* Consonant medial only used in Indic 0A75 in Gurmukhi  (0A00..0A7F)  : also in Lao, Myanmar, Tai Tham, Javanese & Cham  */
    );

/* Visual positions in a syllable from left to right. */
    /* FROM hb-ot-shape-complex-indic-private.hh */

// indic_position
    const POS_START = 0;
    const POS_RA_TO_BECOME_REPH = 1;
    const POS_PRE_M = 2;
    const POS_PRE_C = 3;
    const POS_BASE_C = 4;
    const POS_AFTER_MAIN = 5;
    const POS_ABOVE_C = 6;
    const POS_BEFORE_SUB = 7;
    const POS_BELOW_C = 8;
    const POS_AFTER_SUB = 9;
    const POS_BEFORE_POST = 10;
    const POS_POST_C = 11;
    const POS_AFTER_POST = 12;
    const POS_FINAL_C = 13;
    const POS_SMVD = 14;
    const POS_END = 15;

/*
     * Basic features.
     * These features are applied in order, one at a time, after initial_reordering.
     */
    /*
     * Must be in the same order as the indic_features array. Ones starting with _ are F_GLOBAL
     * Ones without the _ are only applied where the mask says!
     */
    const _NUKT = 0;
    const _AKHN = 1;
    const RPHF = 2;
    const _RKRF = 3;
    const PREF = 4;
    const BLWF = 5;
    const HALF = 6;
    const ABVF = 7;
    const PSTF = 8;
    const CFAR = 9; // Khmer only
    const _VATU = 10;
    const _CJCT = 11;
    const INIT = 12;

public static function set_indic_properties(&$info, $scriptblock) {
        $u = $info['uni'];
        $type = self::indic_get_categories($u);
        $cat = ($type & 0x7F);
        $pos = ($type >> 8);

/*
         * Re-assign category
         */

if ($u == 0x17D1)
            $cat = self::OT_X;

if ($cat == self::OT_X && self::in_range($u, 0x17CB, 0x17D3)) { /* Khmer Various signs */
            /* These are like Top Matras. */
            $cat = self::OT_M;
            $pos = self::POS_ABOVE_C;
        }

if ($u == 0x17C6)
            $cat = self::OT_N; /* Khmer Bindu doesn't like to be repositioned. */

if ($u == 0x17D2)
            $cat = self::OT_Coeng; /* Khmer coeng */

/* The spec says U+0952 is OT_A.	However, testing shows that Uniscribe
         * treats U+0951..U+0952 all as OT_VD.
         * TESTS:
         * U+092E,U+0947,U+0952
         * U+092E,U+0952,U+0947
         * U+092E,U+0947,U+0951
         * U+092E,U+0951,U+0947
         * */
        //if ($u == 0x0952) $cat = self::OT_A;
        if (self::in_range($u, 0x0951, 0x0954))
            $cat = self::OT_VD;

if ($u == 0x200C)
            $cat = self::OT_ZWNJ;
        else if ($u == 0x200D)
            $cat = self::OT_ZWJ;
        else if ($u == 0x25CC)
            $cat = self::OT_DOTTEDCIRCLE;
        else if ($u == 0x0A71)
            $cat = self::OT_SM; /* GURMUKHI ADDAK.	More like consonant medial. like 0A75. */

if ($cat == self::OT_Repha) {
            /* There are two kinds of characters marked as Repha:
             * - The ones that are GenCat=Mn are already positioned visually, ie. after base. (eg. Khmer)
             * - The ones that are GenCat=Lo is encoded logically, ie. beginning of syllable. (eg. Malayalam)
             *
             * We recategorize the first kind to look like a Nukta and attached to the base directly.
             */
            if ($info['general_category'] == UCDN::UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK)
                $cat = self::OT_N;
        }

/*
         * Re-assign position.
         */

if ((self::FLAG($cat) & (self::FLAG(self::OT_C) | self::FLAG(self::OT_CM) | self::FLAG(self::OT_Ra) | self::FLAG(self::OT_V) | self::FLAG(self::OT_NBSP) | self::FLAG(self::OT_DOTTEDCIRCLE)))) { // = CONSONANT_FLAGS like is_consonant
            if ($scriptblock == UCDN::SCRIPT_KHMER)
                $pos = self::POS_BELOW_C; /* Khmer differs from Indic here. */
            else
                $pos = self::POS_BASE_C; /* Will recategorize later based on font lookups. */

if (self::is_ra($u))
                $cat = self::OT_Ra;
        }
        else if ($cat == self::OT_M) {
            $pos = self::matra_position($u, $pos);
        } else if ($cat == self::OT_SM || $cat == self::OT_VD) {
            $pos = self::POS_SMVD;
        }

if ($u == 0x0B01)
            $pos = self::POS_BEFORE_SUB; /* Oriya Bindu is BeforeSub in the spec. */

$info['indic_category'] = $cat;
        $info['indic_position'] = $pos;
    }

// syllable_type
    const CONSONANT_SYLLABLE = 0;
    const VOWEL_SYLLABLE = 1;
    const STANDALONE_CLUSTER = 2;
    const BROKEN_CLUSTER = 3;
    const NON_INDIC_CLUSTER = 4;

public static function set_syllables(&$o, $s, &$broken_syllables) {
        $ptr = 0;
        $syllable_serial = 1;
        $broken_syllables = false;

while ($ptr < strlen($s)) {
            $match = '';
            $syllable_length = 1;
            $syllable_type = self::NON_INDIC_CLUSTER;
            // CONSONANT_SYLLABLE Consonant syllable
            // From OT spec:
            if (preg_match('/^([CR]m*[N]?(H[ZJ]?|[ZJ]H))*[CR]m*[N]?[A]?(H[ZJ]?|[M]*[N]?[H]?)?[S]?[v]{0,2}/', substr($s, $ptr), $ma)) {
                // From HarfBuzz:
                //if (preg_match('/^r?([CR]J?(Z?[N]{0,2})?[ZJ]?H(J[N]?)?){0,4}[CR]J?(Z?[N]{0,2})?A?((([ZJ]?H(J[N]?)?)|HZ)|(HJ)?([ZJ]{0,3}M[N]?(H|JHJR)?){0,4})?(S[Z]?)?[v]{0,2}/', substr($s,$ptr), $ma)) {
                $syllable_length = strlen($ma[0]);
                $syllable_type = self::CONSONANT_SYLLABLE;
            }
            // VOWEL_SYLLABLE Vowel-based syllable
            // From OT spec:
            else if (preg_match('/^(RH|r)?V[N]?([ZJ]?H[CR]m*|J[CR]m*)?([M]*[N]?[H]?)?[S]?[v]{0,2}/', substr($s, $ptr), $ma)) {
                // From HarfBuzz:
                //else if (preg_match('/^(RH|r)?V(Z?[N]{0,2})?(J|([ZJ]?H(J[N]?)?[CR]J?(Z?[N]{0,2})?){0,4}((([ZJ]?H(J[N]?)?)|HZ)|(HJ)?([ZJ]{0,3}M[N]?(H|JHJR)?){0,4})?(S[Z]?)?[v]{0,2})/', substr($s,$ptr), $ma)) {
                $syllable_length = strlen($ma[0]);
                $syllable_type = self::VOWEL_SYLLABLE;
            }

/* Apply only if it's a word start. */
            // STANDALONE_CLUSTER Stand Alone syllable at start of word
            // From OT spec:
            else if (($ptr == 0 ||
                    $o[$ptr - 1]['general_category'] < UCDN::UNICODE_GENERAL_CATEGORY_LOWERCASE_LETTER ||
                    $o[$ptr - 1]['general_category'] > UCDN::UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK
                    ) && (preg_match('/^(RH|r)?[sD][N]?([ZJ]?H[CR]m*)?([M]*[N]?[H]?)?[S]?[v]{0,2}/', substr($s, $ptr), $ma))) {
                // From HarfBuzz:
                // && (preg_match('/^(RH|r)?[sD](Z?[N]{0,2})?(([ZJ]?H(J[N]?)?)[CR]J?(Z?[N]{0,2})?){0,4}((([ZJ]?H(J[N]?)?)|HZ)|(HJ)?([ZJ]{0,3}M[N]?(H|JHJR)?){0,4})?(S[Z]?)?[v]{0,2}/', substr($s,$ptr), $ma)) {
                $syllable_length = strlen($ma[0]);
                $syllable_type = self::STANDALONE_CLUSTER;
            }

// BROKEN_CLUSTER syllable
            else if (preg_match('/^(RH|r)?[N]?([ZJ]?H[CR])?([M]*[N]?[H]?)?[S]?[v]{0,2}/', substr($s, $ptr), $ma)) {
                // From HarfBuzz:
                //else if (preg_match('/^(RH|r)?(Z?[N]{0,2})?(([ZJ]?H(J[N]?)?)[CR]J?(Z?[N]{0,2})?){0,4}((([ZJ]?H(J[N]?)?)|HZ)|(HJ)?([ZJ]{0,3}M[N]?(H|JHJR)?){0,4})(S[Z]?)?[v]{0,2}/', substr($s,$ptr), $ma)) {
                if (strlen($ma[0])) { // May match blank
                    $syllable_length = strlen($ma[0]);
                    $syllable_type = self::BROKEN_CLUSTER;
                    $broken_syllables = true;
                }
            }

for ($i = $ptr; $i < $ptr + $syllable_length; $i++) {
                $o[$i]['syllable'] = ($syllable_serial << 4) | $syllable_type;
            }
            $ptr += $syllable_length;
            $syllable_serial++;
            if ($syllable_serial == 16)
                $syllable_serial = 1;
        }
    }

public static function set_syllables_sinhala(&$o, $s, &$broken_syllables) {
        $ptr = 0;
        $syllable_serial = 1;
        $broken_syllables = false;

while ($ptr < strlen($s)) {
            $match = '';
            $syllable_length = 1;
            $syllable_type = self::NON_INDIC_CLUSTER;
            // CONSONANT_SYLLABLE Consonant syllable
            // From OT spec:
            if (preg_match('/^([CR]HJ|[CR]JH){0,8}[CR][HM]{0,3}[S]{0,1}/', substr($s, $ptr), $ma)) {
                $syllable_length = strlen($ma[0]);
                $syllable_type = self::CONSONANT_SYLLABLE;
            }
            // VOWEL_SYLLABLE Vowel-based syllable
            // From OT spec:
            else if (preg_match('/^V[S]{0,1}/', substr($s, $ptr), $ma)) {
                $syllable_length = strlen($ma[0]);
                $syllable_type = self::VOWEL_SYLLABLE;
            }

public static function set_syllables_khmer(&$o, $s, &$broken_syllables) {
        $ptr = 0;
        $syllable_serial = 1;
        $broken_syllables = false;

while ($ptr < strlen($s)) {
            $match = '';
            $syllable_length = 1;
            $syllable_type = self::NON_INDIC_CLUSTER;
            // CONSONANT_SYLLABLE Consonant syllable
            if (preg_match('/^r?([CR]J?((Z?F)?[N]{0,2})?[ZJ]?G(JN?)?){0,4}[CR]J?((Z?F)?[N]{0,2})?A?((([ZJ]?G(JN?)?)|GZ)|(GJ)?([ZJ]{0,3}MN?(H|JHJR)?){0,4})?(G([CR]J?((Z?F)?[N]{0,2})?|V))?(SZ?)?[v]{0,2}/', substr($s, $ptr), $ma)) {
                $syllable_length = strlen($ma[0]);
                $syllable_type = self::CONSONANT_SYLLABLE;
            }
            // VOWEL_SYLLABLE Vowel-based syllable
            else if (preg_match('/^(RH|r)?V((Z?F)?[N]{0,2})?(J|([ZJ]?G(JN?)?[CR]J?((Z?F)?[N]{0,2})?){0,4}((([ZJ]?G(JN?)?)|GZ)|(GJ)?([ZJ]{0,3}MN?(H|JHJR)?){0,4})?(G([CR]J?((Z?F)?[N]{0,2})?|V))?(SZ?)?[v]{0,2})/', substr($s, $ptr), $ma)) {
                $syllable_length = strlen($ma[0]);
                $syllable_type = self::VOWEL_SYLLABLE;
            }

// BROKEN_CLUSTER syllable
            else if (preg_match('/^(RH|r)?((Z?F)?[N]{0,2})?(([ZJ]?G(JN?)?)[CR]J?((Z?F)?[N]{0,2})?){0,4}((([ZJ]?G(JN?)?)|GZ)|(GJ)?([ZJ]{0,3}MN?(H|JHJR)?){0,4})(G([CR]J?((Z?F)?[N]{0,2})?|V))?(SZ?)?[v]{0,2}/', substr($s, $ptr), $ma)) {
                if (strlen($ma[0])) { // May match blank
                    $syllable_length = strlen($ma[0]);
                    $syllable_type = self::BROKEN_CLUSTER;
                    $broken_syllables = true;
                }
            }

public static function initial_reordering(&$info, $GSUBdata, $broken_syllables, $indic_config, $scriptblock, $is_old_spec, $dottedcircle) {

self::update_consonant_positions($info, $GSUBdata);

if ($broken_syllables && $dottedcircle) {
            self::insert_dotted_circles($info, $dottedcircle);
        }

$count = count($info);
        if (!$count)
            return;
        $last = 0;
        $last_syllable = $info[0]['syllable'];
        for ($i = 1; $i < $count; $i++) {
            if ($last_syllable != $info[$i]['syllable']) {
                self::initial_reordering_syllable($info, $GSUBdata, $indic_config, $scriptblock, $is_old_spec, $last, $i);
                $last = $i;
                $last_syllable = $info[$last]['syllable'];
            }
        }
        self::initial_reordering_syllable($info, $GSUBdata, $indic_config, $scriptblock, $is_old_spec, $last, $count);
    }

public static function update_consonant_positions(&$info, $GSUBdata) {
        $count = count($info);
        for ($i = 0; $i < $count; $i++) {
            if ($info[$i]['indic_position'] == self::POS_BASE_C) {
                $c = $info[$i]['uni'];
                // If would substitute...
                if (isset($GSUBdata['pref'][$c])) {
                    $info[$i]['indic_position'] = self::POS_POST_C;
                } else if (isset($GSUBdata['blwf'][$c])) {
                    $info[$i]['indic_position'] = self::POS_BELOW_C;
                } else if (isset($GSUBdata['pstf'][$c])) {
                    $info[$i]['indic_position'] = self::POS_POST_C;
                }
            }
        }
    }

public static function insert_dotted_circles(&$info, $dottedcircle) {
        $idx = 0;
        $last_syllable = 0;
        while ($idx < count($info)) {
            $syllable = $info[$idx]['syllable'];
            $syllable_type = ($syllable & 0x0F);
            if ($last_syllable != $syllable && $syllable_type == self::BROKEN_CLUSTER) {
                $last_syllable = $syllable;

$dottedcircle[0]['syllable'] = $info[$idx]['syllable'];

/* Insert dottedcircle after possible Repha. */
                while ($idx < count($info) && $last_syllable == $info[$idx]['syllable'] && $info[$idx]['indic_category'] == self::OT_Repha)
                    $idx++;
                array_splice($info, $idx, 0, $dottedcircle);
            } else
                $idx++;
        }
        // I am not sue how this code below got in here, since $idx should now be > count($info) and thus invalid.
        // In case I am missing something(!) I'll leave a warning here for now:
        if (isset($info[$idx])) {
            die("This shouldn't happen (in otl.php)");
            exit;
        }
        // In case of final bloken cluster...
        //$syllable = $info[$idx]['syllable'];
        //$syllable_type = ($syllable & 0x0F);
        //if ($last_syllable != $syllable && $syllable_type == self::BROKEN_CLUSTER) {
        //	$dottedcircle[0]['syllable'] = $info[$idx]['syllable'];
        //	array_splice($info, $idx, 0, $dottedcircle);
        //}
    }

/* Rules from:
     * https://www.microsoft.com/typography/otfntdev/devanot/shaping.aspx */

public static function initial_reordering_syllable(&$info, $GSUBdata, $indic_config, $scriptblock, $is_old_spec, $start, $end) {
        /* vowel_syllable: We made the vowels look like consonants. So uses the consonant logic! */
        /* broken_cluster: We already inserted dotted-circles, so just call the standalone_cluster. */
        /* standalone_cluster: We treat NBSP/dotted-circle as if they are consonants, so we should just chain. */

$syllable_type = ($info[$start]['syllable'] & 0x0F);
        if ($syllable_type == self::NON_INDIC_CLUSTER) {
            return;
        }
        if ($syllable_type == self::BROKEN_CLUSTER || $syllable_type == self::STANDALONE_CLUSTER) {
            //if ($uniscribe_bug_compatible) {
            /* For dotted-circle, this is what Uniscribe does:
             * If dotted-circle is the last glyph, it just does nothing.
             * i.e. It doesn't form Reph. */
            if ($info[$end - 1]['indic_category'] == self::OT_DOTTEDCIRCLE) {
                return;
            }
        }

/* 1. Find base consonant:
         *
         * The shaping engine finds the base consonant of the syllable, using the
         * following algorithm: starting from the end of the syllable, move backwards
         * until a consonant is found that does not have a below-base or post-base
         * form (post-base forms have to follow below-base forms), or that is not a
         * pre-base reordering Ra, or arrive at the first consonant. The consonant
         * stopped at will be the base.
         *
         * 	o If the syllable starts with Ra + Halant (in a script that has Reph)
         * 	and has more than one consonant, Ra is excluded from candidates for
         * 	base consonants.
         */

$base = $end;
        $has_reph = false;
        $limit = $start;

if ($scriptblock != UCDN::SCRIPT_KHMER) {
            /* -> If the syllable starts with Ra + Halant (in a script that has Reph)
             * 	and has more than one consonant, Ra is excluded from candidates for
             * 	base consonants. */
            if (count($GSUBdata['rphf']) /* ?? $indic_plan->mask_array[RPHF] */ && $start + 3 <= $end &&
                    (
                    ($indic_config[4] == self::REPH_MODE_IMPLICIT && !self::is_joiner($info[$start + 2])) ||
                    ($indic_config[4] == self::REPH_MODE_EXPLICIT && $info[$start + 2]['indic_category'] == self::OT_ZWJ)
                    )) {
                /* See if it matches the 'rphf' feature. */
                //$glyphs = array($info[$start]['uni'], $info[$start + 1]['uni']);
                //if ($indic_plan->rphf->would_substitute ($glyphs, count($glyphs), true, face)) {
                if (isset($GSUBdata['rphf'][$info[$start]['uni']]) && self::is_halant_or_coeng($info[$start + 1])) {
                    $limit += 2;
                    while ($limit < $end && self::is_joiner($info[$limit]))
                        $limit++;
                    $base = $start;
                    $has_reph = true;
                }
            } else if ($indic_config[4] == self::REPH_MODE_LOG_REPHA && $info[$start]['indic_category'] == self::OT_Repha) {
                $limit += 1;
                while ($limit < $end && self::is_joiner($info[$limit]))
                    $limit++;
                $base = $start;
                $has_reph = true;
            }
        }

switch ($indic_config[2]) { // base_pos
            case self::BASE_POS_LAST:
                /* -> starting from the end of the syllable, move backwards */
                $i = $end;
                $seen_below = false;
                do {
                    $i--;
                    /* -> until a consonant is found */
                    if (self::is_consonant($info[$i])) {
                        /* -> that does not have a below-base or post-base form
                         * (post-base forms have to follow below-base forms), */
                        if ($info[$i]['indic_position'] != self::POS_BELOW_C && ($info[$i]['indic_position'] != self::POS_POST_C || $seen_below)) {
                            $base = $i;
                            break;
                        }
                        if ($info[$i]['indic_position'] == self::POS_BELOW_C)
                            $seen_below = true;

/* -> or that is not a pre-base reordering Ra,
                         *
                         * IMPLEMENTATION NOTES:
                         *
                         * Our pre-base reordering Ra's are marked POS_POST_C, so will be skipped
                         * by the logic above already.
                         */

/* -> or arrive at the first consonant. The consonant stopped at will
                         * be the base. */
                        $base = $i;
                    }
                    else {
                        /* A ZWJ after a Halant stops the base search, and requests an explicit
                         * half form. 
                         * [A ZWJ before a Halant, requests a subjoined form instead, and hence
                         * search continues. This is particularly important for Bengali
                         * sequence Ra,H,Ya that should form Ya-Phalaa by subjoining Ya] */
                        if ($start < $i && $info[$i]['indic_category'] == self::OT_ZWJ && $info[$i - 1]['indic_category'] == self::OT_H) {
                            if (!defined("OMIT_INDIC_FIX_1") || OMIT_INDIC_FIX_1 != 1) {
                                $base = $i;
                            } // INDIC_FIX_1
                            break;
                        }
                        // ZKI8
                        if ($start < $i && $info[$i]['indic_category'] == self::OT_ZWNJ) {
                            break;
                        }
                    }
                } while ($i > $limit);
                break;

case self::BASE_POS_FIRST:
                /* In scripts without half forms (eg. Khmer), the first consonant is always the base. */

if (!$has_reph)
                    $base = $limit;

/* Find the last base consonant that is not blocked by ZWJ.	If there is
                 * a ZWJ right before a base consonant, that would request a subjoined form. */
                for ($i = $limit; $i < $end; $i++) {
                    if (self::is_consonant($info[$i]) && $info[$i]['indic_position'] == self::POS_BASE_C) {
                        if ($limit < $i && $info[$i - 1]['indic_category'] == self::OT_ZWJ)
                            break;
                        else
                            $base = $i;
                    }
                }

/* Mark all subsequent consonants as below. */
                for ($i = $base + 1; $i < $end; $i++) {
                    if (self::is_consonant($info[$i]) && $info[$i]['indic_position'] == self::POS_BASE_C)
                        $info[$i]['indic_position'] = self::POS_BELOW_C;
                }
                break;
            //default:
            //assert (false);
            /* fallthrough */
        }

/* -> If the syllable starts with Ra + Halant (in a script that has Reph)
         * 	and has more than one consonant, Ra is excluded from candidates for
         * 	base consonants.
         *
         * 	Only do this for unforced Reph. (ie. not for Ra,H,ZWJ. */
        if ($scriptblock != UCDN::SCRIPT_KHMER) {
            if ($has_reph && $base == $start && $limit - $base <= 2) {
                /* Have no other consonant, so Reph is not formed and Ra becomes base. */
                $has_reph = false;
            }
        }

/* 2. Decompose and reorder Matras:
         *
         * Each matra and any syllable modifier sign in the cluster are moved to the
         * appropriate position relative to the consonant(s) in the cluster. The
         * shaping engine decomposes two- or three-part matras into their constituent
         * parts before any repositioning. Matra characters are classified by which
         * consonant in a conjunct they have affinity for and are reordered to the
         * following positions:
         *
         * 		o Before first half form in the syllable
         * 		o After subjoined consonants
         * 		o After post-form consonant
         * 		o After main consonant (for above marks)
         *
         * IMPLEMENTATION NOTES:
         *
         * The normalize() routine has already decomposed matras for us, so we don't
         * need to worry about that.
         */

/* 3.	Reorder marks to canonical order:
         *
         * Adjacent nukta and halant or nukta and vedic sign are always repositioned
         * if necessary, so that the nukta is first.
         *
         * IMPLEMENTATION NOTES:
         *
         * Use the combining Class from Unicode categories? to bubble_sort.
         */

/* Reorder characters */

for ($i = $start; $i < $base; $i++)
            $info[$i]['indic_position'] = min(self::POS_PRE_C, $info[$i]['indic_position']);

if ($base < $end)
            $info[$base]['indic_position'] = self::POS_BASE_C;

/* Mark final consonants. A final consonant is one appearing after a matra,
         * ? only in Khmer. */
        for ($i = $base + 1; $i < $end; $i++)
            if ($info[$i]['indic_category'] == self::OT_M) {
                for ($j = $i + 1; $j < $end; $j++)
                    if (self::is_consonant($info[$j])) {
                        $info[$j]['indic_position'] = self::POS_FINAL_C;
                        break;
                    }
                break;
            }

/* Handle beginning Ra */
        if ($scriptblock != UCDN::SCRIPT_KHMER) {
            if ($has_reph)
                $info[$start]['indic_position'] = self::POS_RA_TO_BECOME_REPH;
        }

/* For old-style Indic script tags, move the first post-base Halant after
         * last consonant.	Only do this if there is *not* a Halant after last
         * consonant. Otherwise it becomes messy. */
        if ($is_old_spec) {
            for ($i = $base + 1; $i < $end; $i++) {
                if ($info[$i]['indic_category'] == self::OT_H) {
                    for ($j = $end - 1; $j > $i; $j--) {
                        if (self::is_consonant($info[$j]) || $info[$j]['indic_category'] == self::OT_H) {
                            break;
                        }
                    }
                    if ($info[$j]['indic_category'] != self::OT_H && $j > $i) {
                        /* Move Halant to after last consonant. */
                        self::_move_info_pos($info, $i, $j + 1);
                    }
                    break;
                }
            }
        }

/* Attach misc marks to previous char to move with them. */
        $last_pos = self::POS_START;
        for ($i = $start; $i < $end; $i++) {
            if ((self::FLAG($info[$i]['indic_category']) & (self::FLAG(self::OT_ZWJ) | self::FLAG(self::OT_ZWNJ) | self::FLAG(self::OT_N) | self::FLAG(self::OT_RS) | self::FLAG(self::OT_H) | self::FLAG(self::OT_Coeng) ))) {
                $info[$i]['indic_position'] = $last_pos;
                if ($info[$i]['indic_category'] == self::OT_H && $info[$i]['indic_position'] == self::POS_PRE_M) {
                    /*
                     * Uniscribe doesn't move the Halant with Left Matra.
                     * TEST: U+092B,U+093F,U+094DE
                     * We follow.	This is important for the Sinhala
                     * U+0DDA split matra since it decomposes to U+0DD9,U+0DCA
                     * where U+0DD9 is a left matra and U+0DCA is the virama.
                     * We don't want to move the virama with the left matra.
                     * TEST: U+0D9A,U+0DDA
                     */
                    for ($j = $i; $j > $start; $j--)
                        if ($info[$j - 1]['indic_position'] != self::POS_PRE_M) {
                            $info[$i]['indic_position'] = $info[$j - 1]['indic_position'];
                            break;
                        }
                }
            } else if ($info[$i]['indic_position'] != self::POS_SMVD) {
                $last_pos = $info[$i]['indic_position'];
            }
        }

/* Re-attach ZWJ, ZWNJ, and halant to next char, for after-base consonants. */
        $last_halant = $end;
        for ($i = $base + 1; $i < $end; $i++) {
            if (self::is_halant_or_coeng($info[$i]))
                $last_halant = $i;
            else if (self::is_consonant($info[$i])) {
                for ($j = $last_halant; $j < $i; $j++)
                    if ($info[$j]['indic_position'] != self::POS_SMVD)
                        $info[$j]['indic_position'] = $info[$i]['indic_position'];
            }
        }

if ($scriptblock == UCDN::SCRIPT_KHMER) {
            /* KHMER_FIX_2 */
            /* Move Coeng+RO (Halant,Ra) sequence before base consonant. */
            for ($i = $base + 1; $i < $end; $i++) {
                if (self::is_halant_or_coeng($info[$i]) && self::is_ra($info[$i + 1]['uni'])) {
                    $info[$i]['indic_position'] = self::POS_PRE_C;
                    $info[$i + 1]['indic_position'] = self::POS_PRE_C;
                    break;
                }
            }
        }

/*
          if (!defined("OMIT_INDIC_FIX_2") || OMIT_INDIC_FIX_2 != 1) {
          // INDIC_FIX_2
          $ZWNJ_found = false;
          $POST_ZWNJ_c_found = false;
          for ($i = $base + 1; $i < $end; $i++) {
          if ($info[$i]['indic_category'] == self::OT_ZWNJ) { $ZWNJ_found = true; }
          else if ($ZWNJ_found && $info[$i]['indic_category'] == self::OT_C) { $POST_ZWNJ_c_found = true; }
          else if ($POST_ZWNJ_c_found && $info[$i]['indic_position'] == self::POS_BEFORE_SUB) { $info[$i]['indic_position'] = self::POS_AFTER_SUB; }
          }
          }
         */

/* Setup masks now */
        for ($i = $start; $i < $end; $i++) {
            $info[$i]['mask'] = 0;
        }

if ($scriptblock == UCDN::SCRIPT_KHMER) {
            /* Find a Coeng+RO (Halant,Ra) sequence and mark it for pre-base processing. */
            $mask = self::FLAG(self::PREF);
            for ($i = $base; $i < $end - 1; $i++) { /* KHMER_FIX_1 From $start (not base) */
                if (self::is_halant_or_coeng($info[$i]) && self::is_ra($info[$i + 1]['uni'])) {

$info[$i]['mask'] |= self::FLAG(self::PREF);
                    $info[$i + 1]['mask'] |= self::FLAG(self::PREF);

/* Mark the subsequent stuff with 'cfar'.  Used in Khmer.
                     * Read the feature spec.
                     * This allows distinguishing the following cases with MS Khmer fonts:
                     * U+1784,U+17D2,U+179A,U+17D2,U+1782  [C+Coeng+RO+Coeng+C] => Should activate CFAR
                     * U+1784,U+17D2,U+1782,U+17D2,U+179A  [C+Coeng+C+Coeng+RO] => Should NOT activate CFAR
                     */
                    for ($j = ($i + 2); $j < $end; $j++)
                        $info[$j]['mask'] |= self::FLAG(self::CFAR);

break;
                }
            }
        }

/* Sit tight, rock 'n roll! */
        self::bubble_sort($info, $start, $end - $start);

/* Find base again */
        $base = $end;
        for ($i = $start; $i < $end; $i++) {
            if ($info[$i]['indic_position'] == self::POS_BASE_C) {
                $base = $i;
                break;
            }
        }

if ($scriptblock != UCDN::SCRIPT_KHMER) {
            /* Reph */
            for ($i = $start; $i < $end; $i++) {
                if ($info[$i]['indic_position'] == self::POS_RA_TO_BECOME_REPH) {
                    $info[$i]['mask'] |= self::FLAG(self::RPHF);
                }
            }

/* Pre-base */
            $mask = self::FLAG(self::HALF);
            for ($i = $start; $i < $base; $i++) {
                $info[$i]['mask'] |= $mask;
            }
        }

/* Post-base */
        $mask = (self::FLAG(self::BLWF) | self::FLAG(self::ABVF) | self::FLAG(self::PSTF));
        for ($i = $base + 1; $i < $end; $i++) {
            $info[$i]['mask'] |= $mask;
        }

if ($scriptblock != UCDN::SCRIPT_KHMER) {
            if (!defined("OMIT_INDIC_FIX_3") || OMIT_INDIC_FIX_3 != 1) {
                /* INDIC_FIX_3 */
                /* Find a (pre-base) Consonant, Halant,Ra sequence and mark Halant|Ra for below-base BLWF processing. */
                // TEST CASE &#x995;&#x9cd;&#x9b0;&#x9cd;&#x995; in FreeSans versus Vrinda
                if (($base - $start) >= 3) {
                    for ($i = $start; $i < ($base - 2); $i++) {
                        if (self::is_consonant($info[$i])) {
                            if (self::is_halant_or_coeng($info[$i + 1]) && self::is_ra($info[$i + 2]['uni'])) {
                                // If would substitute Halant+Ra...BLWF
                                if (isset($GSUBdata['blwf'][$info[$i + 2]['uni']])) {
                                    $info[$i + 1]['mask'] |= self::FLAG(self::BLWF);
                                    $info[$i + 2]['mask'] |= self::FLAG(self::BLWF);
                                }
                                /* If would not substitute as blwf, mark Ra+Halant for RPHF using following Halant (if present) */ else if (self::is_halant_or_coeng($info[$i + 3])) {
                                    $info[$i + 2]['mask'] |= self::FLAG(self::RPHF);
                                    $info[$i + 3]['mask'] |= self::FLAG(self::RPHF);
                                }
                                break;
                            }
                        }
                    }
                }
            }
        }

if ($is_old_spec && $scriptblock == UCDN::SCRIPT_DEVANAGARI) {
            /* Old-spec eye-lash Ra needs special handling.	From the spec:
             * "The feature 'below-base form' is applied to consonants
             * having below-base forms and following the base consonant.
             * The exception is vattu, which may appear below half forms
             * as well as below the base glyph. The feature 'below-base
             * form' will be applied to all such occurrences of Ra as well."
             *
             * Test case: U+0924,U+094D,U+0930,U+094d,U+0915
             * with Sanskrit 2003 font.
             *
             * However, note that Ra,Halant,ZWJ is the correct way to
             * request eyelash form of Ra, so we wouldbn't inhibit it
             * in that sequence.
             *
             * Test case: U+0924,U+094D,U+0930,U+094d,U+200D,U+0915
             */
            for ($i = $start; ($i + 1) < $base; $i++) {
                if ($info[$i]['indic_category'] == self::OT_Ra && $info[$i + 1]['indic_category'] == self::OT_H &&
                        ($i + 2 == $base || $info[$i + 2]['indic_category'] != self::OT_ZWJ)) {
                    $info[$i]['mask'] |= self::FLAG(self::BLWF);
                    $info[$i + 1]['mask'] |= self::FLAG(self::BLWF);
                }
            }
        }

if ($scriptblock != UCDN::SCRIPT_KHMER) {
            if (count($GSUBdata['pref']) && $base + 2 < $end) {
                /* Find a Halant,Ra sequence and mark it for pre-base processing. */
                for ($i = $base + 1; $i + 1 < $end; $i++) {
                    // If old_spec find Ra-Halant...
                    if ((isset($GSUBdata['pref'][$info[$i + 1]['uni']]) && self::is_halant_or_coeng($info[$i]) && self::is_ra($info[$i + 1]['uni']) ) ||
                            ($is_old_spec && isset($GSUBdata['pref'][$info[$i]['uni']]) && self::is_halant_or_coeng($info[$i + 1]) && self::is_ra($info[$i]['uni']) )
                    ) {
                        $info[$i++]['mask'] |= self::FLAG(self::PREF);
                        $info[$i++]['mask'] |= self::FLAG(self::PREF);
                        break;
                    }
                }
            }
        }

/* Apply ZWJ/ZWNJ effects */
        for ($i = $start + 1; $i < $end; $i++) {
            if (self::is_joiner($info[$i])) {
                $non_joiner = ($info[$i]['indic_category'] == self::OT_ZWNJ);
                $j = $i;
                while ($j > $start) {
                    if (defined("OMIT_INDIC_FIX_4") && OMIT_INDIC_FIX_4 == 1) {
                        // INDIC_FIX_4 = do nothing - carry on //
                        // ZWNJ should block H C from forming blwf post-base - need to unmask backwards beyond first consonant arrived at //
                        if (!self::is_consonant($info[$j])) {
                            break;
                        }
                    }
                    $j--;

/* ZWJ/ZWNJ should disable CJCT.	They do that by simply
                     * being there, since we don't skip them for the CJCT
                     * feature (ie. F_MANUAL_ZWJ) */

/* A ZWNJ disables HALF. */
                    if ($non_joiner) {
                        $info[$j]['mask'] &= ~(self::FLAG(self::HALF) | self::FLAG(self::BLWF));
                    }
                }
            }
        }
    }

public static function final_reordering(&$info, $GSUBdata, $indic_config, $scriptblock, $is_old_spec) {
        $count = count($info);
        if (!$count)
            return;
        $last = 0;
        $last_syllable = $info[0]['syllable'];
        for ($i = 1; $i < $count; $i++) {
            if ($last_syllable != $info[$i]['syllable']) {
                self::final_reordering_syllable($info, $GSUBdata, $indic_config, $scriptblock, $is_old_spec, $last, $i);
                $last = $i;
                $last_syllable = $info[$last]['syllable'];
            }
        }
        self::final_reordering_syllable($info, $GSUBdata, $indic_config, $scriptblock, $is_old_spec, $last, $count);
    }

public static function final_reordering_syllable(&$info, $GSUBdata, $indic_config, $scriptblock, $is_old_spec, $start, $end) {

/* 4. Final reordering:
         *
         * After the localized forms and basic shaping forms GSUB features have been
         * applied (see below), the shaping engine performs some final glyph
         * reordering before applying all the remaining font features to the entire
         * cluster.
         */

/* Find base again */
        for ($base = $start; $base < $end; $base++)
            if ($info[$base]['indic_position'] >= self::POS_BASE_C) {
                if ($start < $base && $info[$base]['indic_position'] > self::POS_BASE_C)
                    $base--;
                break;
            }
        if ($base == $end && $start < $base && $info[$base - 1]['indic_category'] != self::OT_ZWJ)
            $base--;
        while ($start < $base && isset($info[$base]) && ($info[$base]['indic_category'] == self::OT_H || $info[$base]['indic_category'] == self::OT_N))
            $base--;

/* 	o Reorder matras:
         *
         * 	If a pre-base matra character had been reordered before applying basic
         * 	features, the glyph can be moved closer to the main consonant based on
         * 	whether half-forms had been formed. Actual position for the matra is
         * 	defined as "after last standalone halant glyph, after initial matra
         * 	position and before the main consonant". If ZWJ or ZWNJ follow this
         * 	halant, position is moved after it.
         */

if ($start + 1 < $end && $start < $base) { /* Otherwise there can't be any pre-base matra characters. */
            /* If we lost track of base, alas, position before last thingy. */
            $new_pos = ($base == $end) ? $base - 2 : $base - 1;

/* Malayalam / Tamil do not have "half" forms or explicit virama forms.
             * The glyphs formed by 'half' are Chillus or ligated explicit viramas.
             * We want to position matra after them.
             */
            if ($scriptblock != UCDN::SCRIPT_MALAYALAM && $scriptblock != UCDN::SCRIPT_TAMIL) {
                while ($new_pos > $start && !(self::is_one_of($info[$new_pos], (self::FLAG(self::OT_M) | self::FLAG(self::OT_H) | self::FLAG(self::OT_Coeng)))))
                    $new_pos--;

/* If we found no Halant we are done.
                 * Otherwise only proceed if the Halant does
                 * not belong to the Matra itself! */
                if (self::is_halant_or_coeng($info[$new_pos]) && $info[$new_pos]['indic_position'] != self::POS_PRE_M) {
                    /* -> If ZWJ or ZWNJ follow this halant, position is moved after it. */
                    if ($new_pos + 1 < $end && self::is_joiner($info[$new_pos + 1]))
                        $new_pos++;
                } else
                    $new_pos = $start; /* No move. */
            }

if ($start < $new_pos && $info[$new_pos]['indic_position'] != self::POS_PRE_M) {
                /* Now go see if there's actually any matras... */
                for ($i = $new_pos; $i > $start; $i--)
                    if ($info[$i - 1]['indic_position'] == self::POS_PRE_M) {
                        $old_pos = $i - 1;
                        //memmove (&info[$old_pos], &info[$old_pos + 1], ($new_pos - $old_pos) * sizeof ($info[0]));
                        self::_move_info_pos($info, $old_pos, $new_pos + 1);

if ($old_pos < $base && $base <= $new_pos) /* Shouldn't actually happen. */
                            $base--;
                        $new_pos--;
                    }
            }
        }

/* 	o Reorder reph:
         *
         * 	Reph's original position is always at the beginning of the syllable,
         * 	(i.e. it is not reordered at the character reordering stage). However,
         * 	it will be reordered according to the basic-forms shaping results.
         * 	Possible positions for reph, depending on the script, are; after main,
         * 	before post-base consonant forms, and after post-base consonant forms.
         */

/* If there's anything after the Ra that has the REPH pos, it ought to be halant.
         * Which means that the font has failed to ligate the Reph.	In which case, we
         * shouldn't move. */
        if ($start + 1 < $end &&
                $info[$start]['indic_position'] == self::POS_RA_TO_BECOME_REPH && $info[$start + 1]['indic_position'] != self::POS_RA_TO_BECOME_REPH) {
            $reph_pos = $indic_config[3];
            $skip_to_reph_step_5 = false;
            $skip_to_reph_move = false;

/* 	1. If reph should be positioned after post-base consonant forms,
             * 	proceed to step 5.
             */
            if ($reph_pos == self::REPH_POS_AFTER_POST) {
                $skip_to_reph_step_5 = true;
            }

/* 	2. If the reph repositioning class is not after post-base: target
             * 	position is after the first explicit halant glyph between the
             * 	first post-reph consonant and last main consonant. If ZWJ or ZWNJ
             * 	are following this halant, position is moved after it. If such
             * 	position is found, this is the target position. Otherwise,
             * 	proceed to the next step.
             *
             * 	Note: in old-implementation fonts, where classifications were
             * 	fixed in shaping engine, there was no case where reph position
             * 	will be found on this step.
             */

if (!$skip_to_reph_step_5) {

$new_reph_pos = $start + 1;

while ($new_reph_pos < $base && !self::is_halant_or_coeng($info[$new_reph_pos]))
                    $new_reph_pos++;

if ($new_reph_pos < $base && self::is_halant_or_coeng($info[$new_reph_pos])) {
                    /* ->If ZWJ or ZWNJ are following this halant, position is moved after it. */
                    if ($new_reph_pos + 1 < $base && self::is_joiner($info[$new_reph_pos + 1]))
                        $new_reph_pos++;
                    $skip_to_reph_move = true;
                }
            }

/* 	3. If reph should be repositioned after the main consonant: find the
             * 	first consonant not ligated with main, or find the first
             * 	consonant that is not a potential pre-base reordering Ra.
             */
            if ($reph_pos == self::REPH_POS_AFTER_MAIN && !$skip_to_reph_move && !$skip_to_reph_step_5) {
                $new_reph_pos = $base;
                /* XXX Skip potential pre-base reordering Ra. */
                while ($new_reph_pos + 1 < $end && $info[$new_reph_pos + 1]['indic_position'] <= self::POS_AFTER_MAIN)
                    $new_reph_pos++;
                if ($new_reph_pos < $end)
                    $skip_to_reph_move = true;
            }

/* 	4. If reph should be positioned before post-base consonant, find
             * 	first post-base classified consonant not ligated with main. If no
             * 	consonant is found, the target position should be before the
             * 	first matra, syllable modifier sign or vedic sign.
             */
            /* This is our take on what step 4 is trying to say (and failing, BADLY). */
            if ($reph_pos == self::REPH_POS_AFTER_SUB && !$skip_to_reph_move && !$skip_to_reph_step_5) {
                $new_reph_pos = $base;
                while ($new_reph_pos < $end && isset($info[$new_reph_pos + 1]['indic_position']) &&
                !( self::FLAG($info[$new_reph_pos + 1]['indic_position']) & (self::FLAG(self::POS_POST_C) | self::FLAG(self::POS_AFTER_POST) | self::FLAG(self::POS_SMVD)))) {
                    $new_reph_pos++;
                }
                if ($new_reph_pos < $end) {
                    $skip_to_reph_move = true;
                }
            }

/* 	5. If no consonant is found in steps 3 or 4, move reph to a position
             * 		immediately before the first post-base matra, syllable modifier
             * 		sign or vedic sign that has a reordering class after the intended
             * 		reph position. For example, if the reordering position for reph
             * 		is post-main, it will skip above-base matras that also have a
             * 		post-main position.
             */
            if (!$skip_to_reph_move) {
                /* Copied from step 2. */
                $new_reph_pos = $start + 1;
                while ($new_reph_pos < $base && !self::is_halant_or_coeng($info[$new_reph_pos]))
                    $new_reph_pos++;

/* 	6. Otherwise, reorder reph to the end of the syllable.
             */
            if (!$skip_to_reph_move) {
                $new_reph_pos = $end - 1;
                while ($new_reph_pos > $start && $info[$new_reph_pos]['indic_position'] == self::POS_SMVD)
                    $new_reph_pos--;

/*
                 * If the Reph is to be ending up after a Matra,Halant sequence,
                 * position it before that Halant so it can interact with the Matra.
                 * However, if it's a plain Consonant,Halant we shouldn't do that.
                 * Uniscribe doesn't do this.
                 * TEST: U+0930,U+094D,U+0915,U+094B,U+094D
                 */
                //if (!$hb_options.uniscribe_bug_compatible && self::is_halant_or_coeng($info[$new_reph_pos])) {
                if (self::is_halant_or_coeng($info[$new_reph_pos])) {
                    for ($i = $base + 1; $i < $new_reph_pos; $i++)
                        if ($info[$i]['indic_category'] == self::OT_M) {
                            /* Ok, got it. */
                            $new_reph_pos--;
                        }
                }
            }

/* Move */
            self::_move_info_pos($info, $start, $new_reph_pos + 1);

if ($start < $base && $base <= $new_reph_pos) {
                $base--;
            }
        }

/* 	o Reorder pre-base reordering consonants:
         *
         * 	If a pre-base reordering consonant is found, reorder it according to
         * 	the following rules:
         */

if (count($GSUBdata['pref']) && $base + 1 < $end) { /* Otherwise there can't be any pre-base reordering Ra. */
            for ($i = $base + 1; $i < $end; $i++) {
                if ($info[$i]['mask'] & self::FLAG(self::PREF)) {
                    /* 	1. Only reorder a glyph produced by substitution during application
                     * 	of the <pref> feature. (Note that a font may shape a Ra consonant with
                     * 	the feature generally but block it in certain contexts.)
                     */
// ??? Need to TEST if actual substitution has occurred
                    if ($i + 1 == $end || ($info[$i + 1]['mask'] & self::FLAG(self::PREF)) == 0) {
                        /*
                         * 	2. Try to find a target position the same way as for pre-base matra.
                         * 	If it is found, reorder pre-base consonant glyph.
                         *
                         * 	3. If position is not found, reorder immediately before main
                         * 	consonant.
                         */
                        $new_pos = $base;
                        /* Malayalam / Tamil do not have "half" forms or explicit virama forms.
                         * The glyphs formed by 'half' are Chillus or ligated explicit viramas.
                         * We want to position matra after them.
                         */
                        if ($scriptblock != UCDN::SCRIPT_MALAYALAM && $scriptblock != UCDN::SCRIPT_TAMIL) {
                            while ($new_pos > $start &&
                            !(self::is_one_of($info[$new_pos - 1], self::FLAG(self::OT_M) | self::FLAG(self::OT_H) | self::FLAG(self::OT_Coeng))))
                                $new_pos--;

/* In Khmer coeng model, a V,Ra can go *after* matras. If it goes after a
                             * split matra, it should be reordered to *before* the left part of such matra. */
                            if ($new_pos > $start && $info[$new_pos - 1]['indic_category'] == self::OT_M) {
                                $old_pos = i;
                                for ($i = $base + 1; $i < $old_pos; $i++)
                                    if ($info[$i]['indic_category'] == self::OT_M) {
                                        $new_pos--;
                                        break;
                                    }
                            }
                        }

if ($new_pos > $start && self::is_halant_or_coeng($info[$new_pos - 1])) {
                            /* -> If ZWJ or ZWNJ follow this halant, position is moved after it. */
                            if ($new_pos < $end && self::is_joiner($info[$new_pos]))
                                $new_pos++;
                        }

$old_pos = $i;
                        self::_move_info_pos($info, $old_pos, $new_pos);

if ($new_pos <= $base && $base < $old_pos)
                            $base++;
                    }

break;
                }
            }
        }

/* Apply 'init' to the Left Matra if it's a word start. */
        if ($info[$start]['indic_position'] == self::POS_PRE_M &&
                ($start == 0 ||
                ($info[$start - 1]['general_category'] < UCDN::UNICODE_GENERAL_CATEGORY_FORMAT || $info[$start - 1]['general_category'] > UCDN::UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK)
                )) {
            $info[$start]['mask'] |= self::FLAG(self::INIT);
        }

/*
         * Finish off and go home!
         */
    }

public static $ra_chars = array(
        0x0930 => 1, /* Devanagari */
        0x09B0 => 1, /* Bengali */
        0x09F0 => 1, /* Bengali (Assamese) */
        0x0A30 => 1, /* Gurmukhi */ /* No Reph */
        0x0AB0 => 1, /* Gujarati */
        0x0B30 => 1, /* Oriya */
        0x0BB0 => 1, /* Tamil */ /* No Reph */
        0x0C30 => 1, /* Telugu */ /* Reph formed only with ZWJ */
        0x0CB0 => 1, /* Kannada */
        0x0D30 => 1, /* Malayalam */ /* No Reph, Logical Repha */
        0x0DBB => 1, /* Sinhala */ /* Reph formed only with ZWJ */
        0x179A => 1, /* Khmer */ /* No Reph, Visual Repha */
    );

public static function is_ra($u) {
        if (isset(self::$ra_chars[$u]))
            return true;
        return false;
    }

public static function is_one_of($info, $flags) {
        if (isset($info['is_ligature']) && $info['is_ligature'])
            return false; /* If it ligated, all bets are off. */
        return !!(self::FLAG($info['indic_category']) & $flags);
    }

public static function is_joiner($info) {
        return self::is_one_of($info, (self::FLAG(self::OT_ZWJ) | self::FLAG(self::OT_ZWNJ)));
    }

/* Vowels and placeholders treated as if they were consonants. */

public static function is_consonant($info) {
        return self::is_one_of($info, (self::FLAG(self::OT_C) | self::FLAG(self::OT_CM) | self::FLAG(self::OT_Ra) | self::FLAG(self::OT_V) | self::FLAG(self::OT_NBSP) | self::FLAG(self::OT_DOTTEDCIRCLE)));
    }

public static function is_halant_or_coeng($info) {
        return self::is_one_of($info, (self::FLAG(self::OT_H) | self::FLAG(self::OT_Coeng)));
    }

// From hb-private.hh
    public static function in_range($u, $lo, $hi) {
        if ((($lo ^ $hi) & $lo) == 0 && (($lo ^ $hi) & $hi) == ($lo ^ $hi) && (($lo ^ $hi) & (($lo ^ $hi) + 1)) == 0)
            return ($u & ~($lo ^ $hi)) == $lo;
        else
            return $lo <= $u && $u <= $hi;
    }

// From hb-private.hh
    public static function FLAG($x) {
        return (1 << ($x));
    }

// BELOW from hb-ot-shape-complex-indic.cc

/*
     * Indic configurations.	
     */

// base_position
    const BASE_POS_FIRST = 0;
    const BASE_POS_LAST = 1;
// reph_position
    const REPH_POS_DEFAULT = 10; // POS_BEFORE_POST,
    const REPH_POS_AFTER_MAIN = 5; // POS_AFTER_MAIN,
    const REPH_POS_BEFORE_SUB = 7; // POS_BEFORE_SUB,
    const REPH_POS_AFTER_SUB = 9; // POS_AFTER_SUB,
    const REPH_POS_BEFORE_POST = 10; // POS_BEFORE_POST,
    const REPH_POS_AFTER_POST = 12; // POS_AFTER_POST
// reph_mode
    const REPH_MODE_IMPLICIT = 0;  /* Reph formed out of initial Ra,H sequence. */
    const REPH_MODE_EXPLICIT = 1;  /* Reph formed out of initial Ra,H,ZWJ sequence. */
    const REPH_MODE_VIS_REPHA = 2; /* Encoded Repha character, no reordering needed. */
    const REPH_MODE_LOG_REPHA = 3; /* Encoded Repha character, needs reordering. */

/*
      struct of indic_configs{
      KEY - script;
      0 - has_old_spec;
      1 - virama;
      2 - base_pos;
      3 - reph_pos;
      4 - reph_mode;
      };
     */

public static $indic_configs = array(/* index is SCRIPT_number from UCDN */
        9 => array(true, 0x094D, 1, 10, 0),
        10 => array(true, 0x09CD, 1, 9, 0),
        11 => array(true, 0x0A4D, 1, 7, 0),
        12 => array(true, 0x0ACD, 1, 10, 0),
        13 => array(true, 0x0B4D, 1, 5, 0),
        14 => array(true, 0x0BCD, 1, 12, 0),
        15 => array(true, 0x0C4D, 1, 12, 1),
        16 => array(true, 0x0CCD, 1, 12, 0),
        17 => array(true, 0x0D4D, 1, 5, 3),
        18 => array(false, 0x0DCA, 0, 5, 1), /* Sinhala */
        30 => array(false, 0x17D2, 0, 10, 2), /* Khmer */
        84 => array(false, 0xA9C0, 1, 10, 0), /* Javanese */
    );

// from "hb-ot-shape-complex-indic-table.cc"

const ISC_A	 = 0; //	INDIC_SYLLABIC_CATEGORY_AVAGRAHA		Avagraha
      const ISC_Bi = 8; //	INDIC_SYLLABIC_CATEGORY_BINDU			Bindu
      const ISC_C	 = 1; //	INDIC_SYLLABIC_CATEGORY_CONSONANT		Consonant
      const ISC_CD = 1; //	INDIC_SYLLABIC_CATEGORY_CONSONANT_DEAD		Consonant_Dead
      const ISC_CF = 17; //	INDIC_SYLLABIC_CATEGORY_CONSONANT_FINAL		Consonant_Final
      const ISC_CHL = 1; //	INDIC_SYLLABIC_CATEGORY_CONSONANT_HEAD_LETTER	Consonant_Head_Letter
      const ISC_CM = 17; //	INDIC_SYLLABIC_CATEGORY_CONSONANT_MEDIAL		Consonant_Medial
      const ISC_CP = 11; //	INDIC_SYLLABIC_CATEGORY_CONSONANT_PLACEHOLDER	Consonant_Placeholder
      const ISC_CR = 15; //	INDIC_SYLLABIC_CATEGORY_CONSONANT_REPHA		Consonant_Repha
      const ISC_CS = 1; //	INDIC_SYLLABIC_CATEGORY_CONSONANT_SUBJOINED	Consonant_Subjoined
      const ISC_ML = 0; //	INDIC_SYLLABIC_CATEGORY_MODIFYING_LETTER	Modifying_Letter
      const ISC_N	 = 3; //	INDIC_SYLLABIC_CATEGORY_NUKTA			Nukta
      const ISC_x	 = 0; //	INDIC_SYLLABIC_CATEGORY_OTHER			Other
      const ISC_RS = 13; //	INDIC_SYLLABIC_CATEGORY_REGISTER_SHIFTER	Register_Shifter
      const ISC_TL = 0; //	INDIC_SYLLABIC_CATEGORY_TONE_LETTER		Tone_Letter
      const ISC_TM = 3; //	INDIC_SYLLABIC_CATEGORY_TONE_MARK		Tone_Mark
      const ISC_V	 = 4; //	INDIC_SYLLABIC_CATEGORY_VIRAMA		Virama
      const ISC_Vs = 8; //	INDIC_SYLLABIC_CATEGORY_VISARGA		Visarga
      const ISC_Vo = 2; //	INDIC_SYLLABIC_CATEGORY_VOWEL			Vowel
      const ISC_M	 = 7; //	INDIC_SYLLABIC_CATEGORY_VOWEL_DEPENDENT	Vowel_Dependent
      const ISC_VI = 2; //	INDIC_SYLLABIC_CATEGORY_VOWEL_INDEPENDENT	Vowel_Independent

const IMC_B	 = 8; //	INDIC_MATRA_CATEGORY_BOTTOM			Bottom
      const IMC_BR = 11; //	INDIC_MATRA_CATEGORY_BOTTOM_AND_RIGHT	Bottom_And_Right
      const IMC_I	 = 15; //	INDIC_MATRA_CATEGORY_INVISIBLE		Invisible
      const IMC_L	 = 3; //	INDIC_MATRA_CATEGORY_LEFT			Left
      const IMC_LR = 11; //	INDIC_MATRA_CATEGORY_LEFT_AND_RIGHT		Left_And_Right
      const IMC_x	 = 15; //	INDIC_MATRA_CATEGORY_NOT_APPLICABLE		Not_Applicable
      const IMC_O	 = 5; //	INDIC_MATRA_CATEGORY_OVERSTRUCK		Overstruck
      const IMC_R	 = 11; //	INDIC_MATRA_CATEGORY_RIGHT			Right
      const IMC_T	 = 6; //	INDIC_MATRA_CATEGORY_TOP			Top
      const IMC_TB = 8; //	INDIC_MATRA_CATEGORY_TOP_AND_BOTTOM		Top_And_Bottom
      const IMC_TBR = 11; //	INDIC_MATRA_CATEGORY_TOP_AND_BOTTOM_AND_RIGHT	Top_And_Bottom_And_Right
      const IMC_TL = 6; //	INDIC_MATRA_CATEGORY_TOP_AND_LEFT		Top_And_Left
      const IMC_TLR = 11; //	INDIC_MATRA_CATEGORY_TOP_AND_LEFT_AND_RIGHT	Top_And_Left_And_Right
      const IMC_TR = 11; //	INDIC_MATRA_CATEGORY_TOP_AND_RIGHT		Top_And_Right
      const IMC_VOL = 2; //	INDIC_MATRA_CATEGORY_VISUAL_ORDER_LEFT		Visual_Order_Left

If in original table = _(C,x), that = ISC_C,IMC_x
      Value is IMC_x << 8 (or IMC_x * 256) = 3840
      plus ISC_C = 1, so = 3841

*/
    public static $indic_table = array(
        /* Devanagari  (0900..097F) */

/* 0900 */ 3848, 3848, 3848, 3848, 3842, 3842, 3842, 3842,
        /* 0908 */ 3842, 3842, 3842, 3842, 3842, 3842, 3842, 3842,
        /* 0910 */ 3842, 3842, 3842, 3842, 3842, 3841, 3841, 3841,
        /* 0918 */ 3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0920 */ 3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0928 */ 3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0930 */ 3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0938 */ 3841, 3841, 1543, 2823, 3843, 3840, 2823, 775,
        /* 0940 */ 2823, 2055, 2055, 2055, 2055, 1543, 1543, 1543,
        /* 0948 */ 1543, 2823, 2823, 2823, 2823, 2052, 775, 2823,
        /* 0950 */ 3840, 3840, 3840, 3840, 3840, 1543, 2055, 2055,
        /* 0958 */ 3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0960 */ 3842, 3842, 2055, 2055, 3840, 3840, 3840, 3840,
        /* 0968 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 0970 */ 3840, 3840, 3842, 3842, 3842, 3842, 3842, 3842,
        /* 0978 */ 3840, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* Bengali  (0980..09FF) */

/* 0980 */ 3840, 3848, 3848, 3848, 3840, 3842, 3842, 3842,
        /* 0988 */ 3842, 3842, 3842, 3842, 3842, 3840, 3840, 3842,
        /* 0990 */ 3842, 3840, 3840, 3842, 3842, 3841, 3841, 3841,
        /* 0998 */ 3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 09A0 */ 3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 09A8 */ 3841, 3840, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 09B0 */ 3841, 3840, 3841, 3840, 3840, 3840, 3841, 3841,
        /* 09B8 */ 3841, 3841, 3840, 3840, 3843, 3840, 2823, 775,
        /* 09C0 */ 2823, 2055, 2055, 2055, 2055, 3840, 3840, 775,
        /* 09C8 */ 775, 3840, 3840, 2823, 2823, 2052, 3841, 3840,
        /* 09D0 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 2823,
        /* 09D8 */ 3840, 3840, 3840, 3840, 3841, 3841, 3840, 3841,
        /* 09E0 */ 3842, 3842, 2055, 2055, 3840, 3840, 3840, 3840,
        /* 09E8 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 09F0 */ 3841, 3841, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 09F8 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* Gurmukhi  (0A00..0A7F) */

/* 0A00 */ 3840, 3848, 3848, 3848, 3840, 3842, 3842, 3842,
        /* 0A08 */ 3842, 3842, 3842, 3840, 3840, 3840, 3840, 3842,
        /* 0A10 */ 3842, 3840, 3840, 3842, 3842, 3841, 3841, 3841,
        /* 0A18 */ 3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0A20 */ 3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0A28 */ 3841, 3840, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0A30 */ 3841, 3840, 3841, 3841, 3840, 3841, 3841, 3840,
        /* 0A38 */ 3841, 3841, 3840, 3840, 3843, 3840, 2823, 775,
        /* 0A40 */ 2823, 2055, 2055, 3840, 3840, 3840, 3840, 1543,
        /* 0A48 */ 1543, 3840, 3840, 1543, 1543, 2052, 3840, 3840,
        /* 0A50 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 0A58 */ 3840, 3841, 3841, 3841, 3841, 3840, 3841, 3840,
        /* 0A60 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 0A68 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 0A70 */ 3848, 3840, 13841, 13841, 3840, 3857, 3840, 3840,
        /* 0A78 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* Gujarati  (0A80..0AFF) */

/* 0A80 */ 3840, 3848, 3848, 3848, 3840, 3842, 3842, 3842,
        /* 0A88 */ 3842, 3842, 3842, 3842, 3842, 3842, 3840, 3842,
        /* 0A90 */ 3842, 3842, 3840, 3842, 3842, 3841, 3841, 3841,
        /* 0A98 */ 3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0AA0 */ 3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0AA8 */ 3841, 3840, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0AB0 */ 3841, 3840, 3841, 3841, 3840, 3841, 3841, 3841,
        /* 0AB8 */ 3841, 3841, 3840, 3840, 3843, 3840, 2823, 775,
        /* 0AC0 */ 2823, 2055, 2055, 2055, 2055, 1543, 3840, 1543,
        /* 0AC8 */ 1543, 2823, 3840, 2823, 2823, 2052, 3840, 3840,
        /* 0AD0 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 0AD8 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 0AE0 */ 3842, 3842, 2055, 2055, 3840, 3840, 3840, 3840,
        /* 0AE8 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 0AF0 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 0AF8 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* Oriya  (0B00..0B7F) */

/* 0B00 */ 3840, 3848, 3848, 3848, 3840, 3842, 3842, 3842,
        /* 0B08 */ 3842, 3842, 3842, 3842, 3842, 3840, 3840, 3842,
        /* 0B10 */ 3842, 3840, 3840, 3842, 3842, 3841, 3841, 3841,
        /* 0B18 */ 3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0B20 */ 3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0B28 */ 3841, 3840, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0B30 */ 3841, 3840, 3841, 3841, 3840, 3841, 3841, 3841,
        /* 0B38 */ 3841, 3841, 3840, 3840, 3843, 3840, 2823, 1543,
        /* 0B40 */ 2823, 2055, 2055, 2055, 2055, 3840, 3840, 775,
        /* 0B48 */ 1543, 3840, 3840, 2823, 2823, 2052, 3840, 3840,
        /* 0B50 */ 3840, 3840, 3840, 3840, 3840, 3840, 1543, 2823,
        /* 0B58 */ 3840, 3840, 3840, 3840, 3841, 3841, 3840, 3841,
        /* 0B60 */ 3842, 3842, 2055, 2055, 3840, 3840, 3840, 3840,
        /* 0B68 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 0B70 */ 3840, 3841, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 0B78 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* Tamil  (0B80..0BFF) */

/* 0B80 */ 3840, 3840, 3848, 3840, 3840, 3842, 3842, 3842,
        /* 0B88 */ 3842, 3842, 3842, 3840, 3840, 3840, 3842, 3842,
        /* 0B90 */ 3842, 3840, 3842, 3842, 3842, 3841, 3840, 3840,
        /* 0B98 */ 3840, 3841, 3841, 3840, 3841, 3840, 3841, 3841,
        /* 0BA0 */ 3840, 3840, 3840, 3841, 3841, 3840, 3840, 3840,
        /* 0BA8 */ 3841, 3841, 3841, 3840, 3840, 3840, 3841, 3841,
        /* 0BB0 */ 3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0BB8 */ 3841, 3841, 3840, 3840, 3840, 3840, 2823, 2823,
        /* 0BC0 */ 1543, 2055, 2055, 3840, 3840, 3840, 775, 775,
        /* 0BC8 */ 775, 3840, 2823, 2823, 2823, 1540, 3840, 3840,
        /* 0BD0 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 2823,
        /* 0BD8 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 0BE0 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 0BE8 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 0BF0 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 0BF8 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* Telugu  (0C00..0C7F) */

/* 0C00 */ 3840, 3848, 3848, 3848, 3840, 3842, 3842, 3842,
        /* 0C08 */ 3842, 3842, 3842, 3842, 3842, 3840, 3842, 3842,
        /* 0C10 */ 3842, 3840, 3842, 3842, 3842, 3841, 3841, 3841,
        /* 0C18 */ 3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0C20 */ 3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0C28 */ 3841, 3840, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0C30 */ 3841, 3841, 3841, 3841, 3840, 3841, 3841, 3841,
        /* 0C38 */ 3841, 3841, 3840, 3840, 3840, 3840, 1543, 1543,
        /* 0C40 */ 1543, 2823, 2823, 2823, 2823, 3840, 1543, 1543,
        /* 0C48 */ 2055, 3840, 1543, 1543, 1543, 1540, 3840, 3840,
        /* 0C50 */ 3840, 3840, 3840, 3840, 3840, 1543, 2055, 3840,
        /* 0C58 */ 3841, 3841, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 0C60 */ 3842, 3842, 2055, 2055, 3840, 3840, 3840, 3840,
        /* 0C68 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 0C70 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 0C78 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* Kannada  (0C80..0CFF) */

/* 0C80 */ 3840, 3840, 3848, 3848, 3840, 3842, 3842, 3842,
        /* 0C88 */ 3842, 3842, 3842, 3842, 3842, 3840, 3842, 3842,
        /* 0C90 */ 3842, 3840, 3842, 3842, 3842, 3841, 3841, 3841,
        /* 0C98 */ 3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0CA0 */ 3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0CA8 */ 3841, 3840, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0CB0 */ 3841, 3841, 3841, 3841, 3840, 3841, 3841, 3841,
        /* 0CB8 */ 3841, 3841, 3840, 3840, 3843, 3840, 2823, 1543,
        /* 0CC0 */ 2823, 2823, 2823, 2823, 2823, 3840, 1543, 2823,
        /* 0CC8 */ 2823, 3840, 2823, 2823, 1543, 1540, 3840, 3840,
        /* 0CD0 */ 3840, 3840, 3840, 3840, 3840, 2823, 2823, 3840,
        /* 0CD8 */ 3840, 3840, 3840, 3840, 3840, 3840, 3841, 3840,
        /* 0CE0 */ 3842, 3842, 2055, 2055, 3840, 3840, 3840, 3840,
        /* 0CE8 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 0CF0 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 0CF8 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* Malayalam  (0D00..0D7F) */

/* 0D00 */ 3840, 3840, 3848, 3848, 3840, 3842, 3842, 3842,
        /* 0D08 */ 3842, 3842, 3842, 3842, 3842, 3840, 3842, 3842,
        /* 0D10 */ 3842, 3840, 3842, 3842, 3842, 3841, 3841, 3841,
        /* 0D18 */ 3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0D20 */ 3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0D28 */ 3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0D30 */ 3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0D38 */ 3841, 3841, 3841, 3840, 3840, 3840, 2823, 2823,
        /* 0D40 */ 2823, 2823, 2823, 2055, 2055, 3840, 775, 775,
        /* 0D48 */ 775, 3840, 2823, 2823, 2823, 1540, 3855, 3840,
        /* 0D50 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 2823,
        /* 0D58 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 0D60 */ 3842, 3842, 2055, 2055, 3840, 3840, 3840, 3840,
        /* 0D68 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 0D70 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 0D78 */ 3840, 3840, 3841, 3841, 3841, 3841, 3841, 3841,
        /* Sinhala  (0D80..0DFF) */

/* 0D80 */ 3840, 3840, 3848, 3848, 3840, 3842, 3842, 3842,
        /* 0D88 */ 3842, 3842, 3842, 3842, 3842, 3842, 3842, 3842,
        /* 0D90 */ 3842, 3842, 3842, 3842, 3842, 3842, 3842, 3840,
        /* 0D98 */ 3840, 3840, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0DA0 */ 3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0DA8 */ 3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 0DB0 */ 3841, 3841, 3840, 3841, 3841, 3841, 3841, 3841,
        /* 0DB8 */ 3841, 3841, 3841, 3841, 3840, 3841, 3840, 3840,
        /* 0DC0 */ 3841, 3841, 3841, 3841, 3841, 3841, 3841, 3840,
        /* 0DC8 */ 3840, 3840, 1540, 3840, 3840, 3840, 3840, 2823,
        /* 0DD0 */ 2823, 2823, 1543, 1543, 2055, 3840, 2055, 3840,
        /* 0DD8 */ 2823, 775, 1543, 775, 2823, 2823, 2823, 2823,
        /* 0DE0 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 0DE8 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 0DF0 */ 3840, 3840, 2823, 2823, 3840, 3840, 3840, 3840,
        /* 0DF8 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* Vedic Extensions  (1CD0..1CFF) */

/* 1CD0 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 1CD8 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 1CE0 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 1CE8 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 1CF0 */ 3840, 3840, 3848, 3848, 3840, 3840, 3840, 3840,
        /* 1CF8 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
    );
    public static $khmer_table = array(
        /* Khmer  (1780..17FF) */

/* 1780 */ 3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 1788 */ 3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 1790 */ 3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 1798 */ 3841, 3841, 3841, 3841, 3841, 3841, 3841, 3841,
        /* 17A0 */ 3841, 3841, 3841, 3842, 3842, 3842, 3842, 3842,
        /* 17A8 */ 3842, 3842, 3842, 3842, 3842, 3842, 3842, 3842,
        /* 17B0 */ 3842, 3842, 3842, 3842, 3840, 3840, 2823, 1543,
        /* 17B8 */ 1543, 1543, 1543, 2055, 2055, 2055, 1543, 2823,
        /* 17C0 */ 2823, 775, 775, 775, 2823, 2823, 3848, 3848,
        /* 17C8 */ 2823, 3853, 3853, 3840, 3855, 3840, 3840, 3840,
        /* 17D0 */ 3840, 1540, 3844, 3840, 3840, 3840, 3840, 3840,
        /* 17D8 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 17E0 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 17E8 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 17F0 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
        /* 17F8 */ 3840, 3840, 3840, 3840, 3840, 3840, 3840, 3840,
    );

// from "hb-ot-shape-complex-indic-table.cc"
    public static function indic_get_categories($u) {
        if (0x0900 <= $u && $u <= 0x0DFF)
            return self::$indic_table[$u - 0x0900 + 0]; // offset 0 for Most "indic"
        if (0x1CD0 <= $u && $u <= 0x1D00)
            return self::$indic_table[$u - 0x1CD0 + 1152]; // offset for Vedic extensions
        if (0x1780 <= $u && $u <= 0x17FF)
            return self::$khmer_table[$u - 0x1780];  // Khmer
        if ($u == 0x00A0)
            return 3851; // (ISC_CP | (IMC_x << 8))
        if ($u == 0x25CC)
            return 3851; // (ISC_CP | (IMC_x << 8))
        return 3840; // (ISC_x | (IMC_x << 8))
    }

// BELOW from hb-ot-shape-complex-indic.cc
    /*
     * Indic shaper.
     */

public static function IN_HALF_BLOCK($u, $Base) {
        return (($u & ~0x7F) == $Base);
    }

public static function IS_DEVA($u) {
        return self::IN_HALF_BLOCK($u, 0x0900);
    }

public static function IS_BENG($u) {
        return self::IN_HALF_BLOCK($u, 0x0980);
    }

public static function IS_GURU($u) {
        return self::IN_HALF_BLOCK($u, 0x0A00);
    }

public static function IS_GUJR($u) {
        return self::IN_HALF_BLOCK($u, 0x0A80);
    }

public static function IS_ORYA($u) {
        return self::IN_HALF_BLOCK($u, 0x0B00);
    }

public static function IS_TAML($u) {
        return self::IN_HALF_BLOCK($u, 0x0B80);
    }

public static function IS_TELU($u) {
        return self::IN_HALF_BLOCK($u, 0x0C00);
    }

public static function IS_KNDA($u) {
        return self::IN_HALF_BLOCK($u, 0x0C80);
    }

public static function IS_MLYM($u) {
        return self::IN_HALF_BLOCK($u, 0x0D00);
    }

public static function IS_SINH($u) {
        return self::IN_HALF_BLOCK($u, 0x0D80);
    }

public static function IS_KHMR($u) {
        return self::IN_HALF_BLOCK($u, 0x1780);
    }

public static function MATRA_POS_LEFT($u) {
        return self::POS_PRE_M;
    }

public static function MATRA_POS_RIGHT($u) {
        return
                (self::IS_DEVA($u) ? self::POS_AFTER_SUB :
                (self::IS_BENG($u) ? self::POS_AFTER_POST :
                (self::IS_GURU($u) ? self::POS_AFTER_POST :
                (self::IS_GUJR($u) ? self::POS_AFTER_POST :
                (self::IS_ORYA($u) ? self::POS_AFTER_POST :
                (self::IS_TAML($u) ? self::POS_AFTER_POST :
                (self::IS_TELU($u) ? ($u <= 0x0C42 ? self::POS_BEFORE_SUB : self::POS_AFTER_SUB) :
                (self::IS_KNDA($u) ? ($u < 0x0CC3 || $u > 0xCD6 ? self::POS_BEFORE_SUB : self::POS_AFTER_SUB) :
                (self::IS_MLYM($u) ? self::POS_AFTER_POST :
                (self::IS_SINH($u) ? self::POS_AFTER_SUB :
                (self::IS_KHMR($u) ? self::POS_AFTER_POST :
                self::POS_AFTER_SUB))))))))))); /* default */
    }

public static function MATRA_POS_TOP($u) {
        return /* BENG and MLYM don't have top matras. */
                (self::IS_DEVA($u) ? self::POS_AFTER_SUB :
                (self::IS_GURU($u) ? self::POS_AFTER_POST : /* Deviate from spec */
                (self::IS_GUJR($u) ? self::POS_AFTER_SUB :
                (self::IS_ORYA($u) ? self::POS_AFTER_MAIN :
                (self::IS_TAML($u) ? self::POS_AFTER_SUB :
                (self::IS_TELU($u) ? self::POS_BEFORE_SUB :
                (self::IS_KNDA($u) ? self::POS_BEFORE_SUB :
                (self::IS_SINH($u) ? self::POS_AFTER_SUB :
                (self::IS_KHMR($u) ? self::POS_AFTER_POST :
                self::POS_AFTER_SUB))))))))); /* default */
    }

public static function MATRA_POS_BOTTOM($u) {
        return
                (self::IS_DEVA($u) ? self::POS_AFTER_SUB :
                (self::IS_BENG($u) ? self::POS_AFTER_SUB :
                (self::IS_GURU($u) ? self::POS_AFTER_POST :
                (self::IS_GUJR($u) ? self::POS_AFTER_POST :
                (self::IS_ORYA($u) ? self::POS_AFTER_SUB :
                (self::IS_TAML($u) ? self::POS_AFTER_POST :
                (self::IS_TELU($u) ? self::POS_BEFORE_SUB :
                (self::IS_KNDA($u) ? self::POS_BEFORE_SUB :
                (self::IS_MLYM($u) ? self::POS_AFTER_POST :
                (self::IS_SINH($u) ? self::POS_AFTER_SUB :
                (self::IS_KHMR($u) ? self::POS_AFTER_POST :
                self::POS_AFTER_SUB))))))))))); /* default */
    }

public static function matra_position($u, $side) {
        switch ($side) {
            case self::POS_PRE_C: return self::MATRA_POS_LEFT($u);
            case self::POS_POST_C: return self::MATRA_POS_RIGHT($u);
            case self::POS_ABOVE_C: return self::MATRA_POS_TOP($u);
            case self::POS_BELOW_C: return self::MATRA_POS_BOTTOM($u);
        }
        return $side;
    }

// vowel matras that have to be split into two parts.
// From Harfbuzz (old)
// New HarfBuzz uses /src/hb-ucdn/ucdn.c and unicodedata_db.h for full method of decomposition for all characters
// Should always fully decompose and then recompose back, but we will just do the split matras
    public static function decompose_indic($ab) {
        $sub = array();
        switch ($ab) {
            /*
             * Decompose split matras.
             */
            /* bengali */
            case 0x9cb : $sub[0] = 0x9c7;
                $sub[1] = 0x9be;
                return $sub;
            case 0x9cc : $sub[0] = 0x9c7;
                $sub[1] = 0x9d7;
                return $sub;
            /* oriya */
            case 0xb48 : $sub[0] = 0xb47;
                $sub[1] = 0xb56;
                return $sub;
            case 0xb4b : $sub[0] = 0xb47;
                $sub[1] = 0xb3e;
                return $sub;
            case 0xb4c : $sub[0] = 0xb47;
                $sub[1] = 0xb57;
                return $sub;
            /* tamil */
            case 0xbca : $sub[0] = 0xbc6;
                $sub[1] = 0xbbe;
                return $sub;
            case 0xbcb : $sub[0] = 0xbc7;
                $sub[1] = 0xbbe;
                return $sub;
            case 0xbcc : $sub[0] = 0xbc6;
                $sub[1] = 0xbd7;
                return $sub;
            /* telugu */
            case 0xc48 : $sub[0] = 0xc46;
                $sub[1] = 0xc56;
                return $sub;
            /* kannada */
            case 0xcc0 : $sub[0] = 0xcbf;
                $sub[1] = 0xcd5;
                return $sub;
            case 0xcc7 : $sub[0] = 0xcc6;
                $sub[1] = 0xcd5;
                return $sub;
            case 0xcc8 : $sub[0] = 0xcc6;
                $sub[1] = 0xcd6;
                return $sub;
            case 0xcca : $sub[0] = 0xcc6;
                $sub[1] = 0xcc2;
                return $sub;
            case 0xccb : $sub[0] = 0xcc6;
                $sub[1] = 0xcc2;
                $sub[2] = 0xcd5;
                return $sub;
            /* malayalam */
            case 0xd4a : $sub[0] = 0xd46;
                $sub[1] = 0xd3e;
                return $sub;
            case 0xd4b : $sub[0] = 0xd47;
                $sub[1] = 0xd3e;
                return $sub;
            case 0xd4c : $sub[0] = 0xd46;
                $sub[1] = 0xd57;
                return $sub;
            /* sinhala */
            // NB Some fonts break with these Sinhala decomps (although this is Uniscribe spec)
            // Can check if character would be substituted by pstf and only decompose if true
            // e.g. if (isset($GSUBdata['pstf'][$ab])) - would need to pass $GSUBdata as parameter to this function
            case 0xdda : $sub[0] = 0xdd9;
                $sub[1] = 0xdca;
                return $sub;
            case 0xddc : $sub[0] = 0xdd9;
                $sub[1] = 0xdcf;
                return $sub;
            case 0xddd : $sub[0] = 0xdd9;
                $sub[1] = 0xdcf;
                $sub[2] = 0xdca;
                return $sub;
            case 0xdde : $sub[0] = 0xdd9;
                $sub[1] = 0xddf;
                return $sub;
            /* khmer */
            case 0x17be : $sub[0] = 0x17c1;
                $sub[1] = 0x17be;
                return $sub;
            case 0x17bf : $sub[0] = 0x17c1;
                $sub[1] = 0x17bf;
                return $sub;
            case 0x17c0 : $sub[0] = 0x17c1;
                $sub[1] = 0x17c0;
                return $sub;

case 0x17c4 : $sub[0] = 0x17c1;
                $sub[1] = 0x17c4;
                return $sub;
            case 0x17c5 : $sub[0] = 0x17c1;
                $sub[1] = 0x17c5;
                return $sub;
            /* tibetan - included here although does not use Inidc shaper in other ways  */
            case 0xf73 : $sub[0] = 0xf71;
                $sub[1] = 0xf72;
                return $sub;
            case 0xf75 : $sub[0] = 0xf71;
                $sub[1] = 0xf74;
                return $sub;
            case 0xf76 : $sub[0] = 0xfb2;
                $sub[1] = 0xf80;
                return $sub;
            case 0xf77 : $sub[0] = 0xfb2;
                $sub[1] = 0xf81;
                return $sub;
            case 0xf78 : $sub[0] = 0xfb3;
                $sub[1] = 0xf80;
                return $sub;
            case 0xf79 : $sub[0] = 0xfb3;
                $sub[1] = 0xf71;
                $sub[2] = 0xf80;
                return $sub;
            case 0xf81 : $sub[0] = 0xf71;
                $sub[1] = 0xf80;
                return $sub;
        }
        return false;
    }

public static function bubble_sort(&$arr, $start, $len) {
        if ($len < 2) {
            return;
        }
        $k = $start + $len - 2;
        while ($k >= $start) {
            for ($j = $start; $j <= $k; $j++) {
                if ($arr[$j]['indic_position'] > $arr[$j + 1]['indic_position']) {
                    $t = $arr[$j];
                    $arr[$j] = $arr[$j + 1];
                    $arr[$j + 1] = $t;
                }
            }
            $k--;
        }
    }

}

// end Class
?>

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