harfrust 0.5.2

A complete HarfBuzz shaping algorithm port to Rust.
Documentation
#![allow(
    dead_code,
    non_upper_case_globals,
    unused_assignments,
    unused_parens,
    while_true,
    clippy::assign_op_pattern,
    clippy::collapsible_if,
    clippy::comparison_chain,
    clippy::double_parens,
    clippy::unnecessary_cast,
    clippy::single_match,
    clippy::never_loop
)]

use super::buffer::{hb_buffer_t, HB_BUFFER_SCRATCH_FLAG_HAS_BROKEN_SYLLABLE};

static _myanmar_syllable_machine_trans_keys: [u8; 108] = [
    0, 22, 1, 22, 3, 22, 3, 22, 1, 22, 3, 22, 1, 22, 1, 22, 1, 22, 1, 22, 1, 22, 3, 22, 0, 8, 1,
    22, 1, 22, 1, 22, 1, 22, 1, 22, 1, 22, 1, 22, 1, 22, 1, 22, 1, 22, 1, 22, 1, 22, 3, 22, 3, 22,
    1, 22, 3, 22, 1, 22, 1, 22, 1, 22, 1, 22, 1, 22, 3, 22, 0, 8, 1, 22, 1, 22, 1, 22, 1, 22, 1,
    22, 1, 22, 1, 22, 1, 22, 1, 22, 1, 22, 1, 22, 1, 22, 1, 22, 1, 22, 1, 22, 0, 22, 0, 8, 0, 0,
];
static _myanmar_syllable_machine_char_class: [i8; 59] = [
    0, 0, 1, 2, 3, 3, 4, 5, 6, 7, 7, 4, 4, 4, 8, 4, 4, 9, 4, 10, 11, 12, 13, 4, 4, 4, 4, 4, 4, 4,
    4, 14, 4, 4, 15, 16, 17, 18, 19, 20, 21, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 22, 0, 0,
];
static _myanmar_syllable_machine_index_offsets: [i16; 55] = [
    0, 23, 45, 65, 85, 107, 127, 149, 171, 193, 215, 237, 257, 266, 288, 310, 332, 354, 376, 398,
    420, 442, 464, 486, 508, 530, 550, 570, 592, 612, 634, 656, 678, 700, 722, 742, 751, 773, 795,
    817, 839, 861, 883, 905, 927, 949, 971, 993, 1015, 1037, 1059, 1081, 1104, 0, 0,
];
static _myanmar_syllable_machine_indices: [i8; 1115] = [
    2, 3, 4, 5, 1, 6, 7, 2, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 24, 25, 26,
    23, 27, 28, 23, 23, 23, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 27, 26, 23, 27, 23, 23,
    23, 23, 23, 23, 23, 32, 41, 23, 23, 23, 23, 38, 23, 23, 27, 26, 23, 27, 23, 23, 23, 23, 23, 23,
    23, 23, 23, 23, 23, 23, 23, 38, 23, 23, 27, 42, 23, 26, 23, 27, 38, 23, 23, 23, 23, 23, 23, 23,
    27, 23, 23, 23, 23, 38, 23, 23, 27, 26, 23, 27, 23, 23, 23, 23, 23, 23, 23, 23, 27, 23, 23, 23,
    23, 38, 23, 23, 27, 24, 23, 26, 23, 27, 28, 23, 23, 23, 43, 23, 23, 32, 44, 45, 23, 23, 23, 38,
    23, 44, 27, 24, 23, 26, 23, 27, 28, 23, 23, 23, 23, 23, 23, 32, 23, 23, 23, 23, 23, 38, 23, 23,
    27, 24, 23, 26, 23, 27, 28, 23, 23, 23, 43, 23, 23, 32, 23, 23, 23, 23, 23, 38, 23, 23, 27, 24,
    23, 26, 23, 27, 28, 23, 23, 23, 43, 23, 23, 32, 44, 23, 23, 23, 23, 38, 23, 23, 27, 24, 23, 26,
    23, 27, 28, 23, 23, 23, 43, 23, 23, 32, 44, 23, 23, 23, 23, 38, 23, 44, 27, 26, 23, 27, 23, 23,
    23, 23, 23, 23, 23, 32, 23, 23, 23, 23, 23, 38, 23, 23, 27, 2, 23, 23, 23, 23, 23, 23, 23, 2,
    24, 23, 26, 23, 27, 28, 23, 23, 23, 29, 30, 23, 32, 23, 23, 23, 23, 23, 38, 23, 23, 27, 24, 23,
    26, 23, 27, 28, 23, 23, 23, 23, 30, 23, 32, 23, 23, 23, 23, 23, 38, 23, 23, 27, 24, 23, 26, 23,
    27, 28, 23, 23, 23, 29, 30, 31, 32, 23, 23, 23, 23, 23, 38, 46, 23, 27, 24, 23, 26, 23, 27, 28,
    23, 23, 23, 29, 30, 31, 32, 23, 23, 23, 23, 23, 38, 23, 23, 27, 24, 23, 26, 23, 27, 28, 23, 23,
    23, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 23, 40, 27, 24, 23, 26, 23, 27, 28, 23, 23, 23, 29,
    30, 31, 32, 46, 23, 23, 23, 23, 38, 23, 40, 27, 24, 23, 26, 23, 27, 28, 23, 23, 23, 29, 30, 31,
    32, 46, 23, 23, 23, 23, 38, 23, 23, 27, 24, 23, 26, 23, 27, 28, 23, 23, 23, 29, 30, 31, 32, 23,
    34, 23, 36, 23, 38, 23, 40, 27, 24, 23, 26, 23, 27, 28, 23, 23, 23, 29, 30, 31, 32, 46, 34, 23,
    23, 23, 38, 23, 40, 27, 24, 23, 26, 23, 27, 28, 23, 23, 23, 29, 30, 31, 32, 47, 34, 35, 36, 23,
    38, 23, 40, 27, 24, 23, 26, 23, 27, 28, 23, 23, 23, 29, 30, 31, 32, 23, 34, 35, 36, 23, 38, 23,
    40, 27, 24, 25, 26, 23, 27, 28, 23, 23, 23, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 23, 40, 27,
    49, 48, 6, 48, 48, 48, 48, 48, 48, 48, 13, 50, 48, 48, 48, 48, 19, 48, 48, 6, 49, 51, 6, 51,
    51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 19, 51, 51, 6, 52, 48, 49, 48, 6, 19, 48, 48,
    48, 48, 48, 48, 48, 6, 48, 48, 48, 48, 19, 48, 48, 6, 49, 48, 6, 48, 48, 48, 48, 48, 48, 48,
    48, 6, 48, 48, 48, 48, 19, 48, 48, 6, 3, 48, 49, 48, 6, 7, 48, 48, 48, 53, 48, 48, 13, 54, 55,
    48, 48, 48, 19, 48, 54, 6, 3, 48, 49, 48, 6, 7, 48, 48, 48, 48, 48, 48, 13, 48, 48, 48, 48, 48,
    19, 48, 48, 6, 3, 48, 49, 48, 6, 7, 48, 48, 48, 53, 48, 48, 13, 48, 48, 48, 48, 48, 19, 48, 48,
    6, 3, 48, 49, 48, 6, 7, 48, 48, 48, 53, 48, 48, 13, 54, 48, 48, 48, 48, 19, 48, 48, 6, 3, 48,
    49, 48, 6, 7, 48, 48, 48, 53, 48, 48, 13, 54, 48, 48, 48, 48, 19, 48, 54, 6, 49, 48, 6, 48, 48,
    48, 48, 48, 48, 48, 13, 48, 48, 48, 48, 48, 19, 48, 48, 6, 56, 48, 48, 48, 48, 48, 48, 48, 56,
    3, 4, 49, 48, 6, 7, 48, 48, 48, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 6, 3, 48, 49,
    48, 6, 7, 48, 48, 48, 10, 11, 48, 13, 48, 48, 48, 48, 48, 19, 48, 48, 6, 3, 48, 49, 48, 6, 7,
    48, 48, 48, 48, 11, 48, 13, 48, 48, 48, 48, 48, 19, 48, 48, 6, 3, 48, 49, 48, 6, 7, 48, 48, 48,
    10, 11, 12, 13, 48, 48, 48, 48, 48, 19, 57, 48, 6, 3, 48, 49, 48, 6, 7, 48, 48, 48, 10, 11, 12,
    13, 48, 48, 48, 48, 48, 19, 48, 48, 6, 3, 48, 49, 48, 6, 7, 48, 48, 48, 10, 11, 12, 13, 14, 15,
    16, 17, 18, 19, 48, 21, 6, 3, 48, 49, 48, 6, 7, 48, 48, 48, 10, 11, 12, 13, 57, 48, 48, 48, 48,
    19, 48, 21, 6, 3, 48, 49, 48, 6, 7, 48, 48, 48, 10, 11, 12, 13, 57, 48, 48, 48, 48, 19, 48, 48,
    6, 3, 48, 49, 48, 6, 7, 48, 48, 48, 10, 11, 12, 13, 48, 15, 48, 17, 48, 19, 48, 21, 6, 3, 48,
    49, 48, 6, 7, 48, 48, 48, 10, 11, 12, 13, 57, 15, 48, 48, 48, 19, 48, 21, 6, 3, 48, 49, 48, 6,
    7, 48, 48, 48, 10, 11, 12, 13, 58, 15, 16, 17, 48, 19, 48, 21, 6, 3, 48, 49, 48, 6, 7, 48, 48,
    48, 10, 11, 12, 13, 48, 15, 16, 17, 48, 19, 48, 21, 6, 3, 4, 49, 48, 6, 7, 48, 48, 48, 10, 11,
    12, 13, 14, 15, 16, 17, 18, 19, 48, 21, 6, 24, 25, 26, 23, 27, 28, 23, 23, 23, 29, 30, 31, 32,
    59, 34, 35, 36, 37, 38, 39, 40, 27, 24, 60, 26, 23, 27, 28, 23, 23, 23, 29, 30, 31, 32, 33, 34,
    35, 36, 37, 38, 23, 40, 27, 2, 3, 4, 49, 48, 6, 7, 2, 2, 48, 10, 11, 12, 13, 14, 15, 16, 17,
    18, 19, 20, 21, 6, 2, 61, 61, 61, 61, 61, 61, 2, 2, 0, 0,
];
static _myanmar_syllable_machine_index_defaults: [i8; 55] = [
    1, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23,
    23, 48, 51, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48,
    48, 23, 23, 48, 61, 0, 0,
];
static _myanmar_syllable_machine_cond_targs: [i8; 64] = [
    0, 0, 1, 25, 35, 0, 26, 30, 49, 52, 37, 38, 39, 29, 41, 42, 44, 45, 46, 27, 48, 43, 26, 0, 2,
    12, 0, 3, 7, 13, 14, 15, 6, 17, 18, 20, 21, 22, 4, 24, 19, 11, 5, 8, 9, 10, 16, 23, 0, 0, 34,
    0, 28, 31, 32, 33, 36, 40, 47, 50, 51, 0, 0, 0,
];
static _myanmar_syllable_machine_cond_actions: [i8; 64] = [
    0, 3, 0, 0, 0, 4, 5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 6, 7, 0, 0, 8, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 9, 10, 0, 11, 0, 0, 0, 0, 0, 0, 0, 0, 0, 12, 0,
    0,
];
static _myanmar_syllable_machine_to_state_actions: [i8; 55] = [
    1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
];
static _myanmar_syllable_machine_from_state_actions: [i8; 55] = [
    2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
];
static _myanmar_syllable_machine_eof_trans: [i8; 55] = [
    1, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
    24, 49, 52, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49,
    49, 24, 24, 49, 62, 0, 0,
];
static myanmar_syllable_machine_start: i32 = 0;
static myanmar_syllable_machine_first_final: i32 = 0;
static myanmar_syllable_machine_error: i32 = -1;
static myanmar_syllable_machine_en_main: i32 = 0;
#[derive(Clone, Copy)]
pub enum SyllableType {
    ConsonantSyllable = 0,
    PunctuationCluster,
    BrokenCluster,
    NonMyanmarCluster,
}

pub fn find_syllables_myanmar(buffer: &mut hb_buffer_t) {
    let mut cs = 0;
    let mut ts = 0;
    let mut te;
    let mut act = 0;
    let mut p = 0;
    let pe = buffer.len;
    let eof = buffer.len;
    let mut syllable_serial = 1u8;

    macro_rules! found_syllable {
        ($kind:expr) => {{
            found_syllable(ts, te, &mut syllable_serial, $kind, buffer);
        }};
    }

    {
        cs = (myanmar_syllable_machine_start) as i32;
        ts = 0;
        te = 0;
        act = 0;
    }

    {
        let mut _trans = 0;
        let mut _keys: i32 = 0;
        let mut _inds: i32 = 0;
        let mut _ic = 0;
        '_resume: while (p != pe || p == eof) {
            '_again: while (true) {
                match (_myanmar_syllable_machine_from_state_actions[(cs) as usize]) {
                    2 => {
                        ts = p;
                    }

                    _ => {}
                }
                if (p == eof) {
                    {
                        if (_myanmar_syllable_machine_eof_trans[(cs) as usize] > 0) {
                            {
                                _trans =
                                    (_myanmar_syllable_machine_eof_trans[(cs) as usize]) as u32 - 1;
                            }
                        }
                    }
                } else {
                    {
                        _keys = (cs << 1) as i32;
                        _inds = (_myanmar_syllable_machine_index_offsets[(cs) as usize]) as i32;
                        if ((buffer.info[p].myanmar_category() as u8) <= 57
                            && (buffer.info[p].myanmar_category() as u8) >= 1)
                        {
                            {
                                _ic = (_myanmar_syllable_machine_char_class[((buffer.info[p]
                                    .myanmar_category()
                                    as u8)
                                    as i32
                                    - 1)
                                    as usize]) as i32;
                                if (_ic
                                    <= (_myanmar_syllable_machine_trans_keys[(_keys + 1) as usize])
                                        as i32
                                    && _ic
                                        >= (_myanmar_syllable_machine_trans_keys[(_keys) as usize])
                                            as i32)
                                {
                                    _trans = (_myanmar_syllable_machine_indices[(_inds
                                        + (_ic
                                            - (_myanmar_syllable_machine_trans_keys
                                                [(_keys) as usize])
                                                as i32)
                                            as i32)
                                        as usize])
                                        as u32;
                                } else {
                                    _trans = (_myanmar_syllable_machine_index_defaults
                                        [(cs) as usize])
                                        as u32;
                                }
                            }
                        } else {
                            {
                                _trans = (_myanmar_syllable_machine_index_defaults[(cs) as usize])
                                    as u32;
                            }
                        }
                    }
                }
                cs = (_myanmar_syllable_machine_cond_targs[(_trans) as usize]) as i32;
                if (_myanmar_syllable_machine_cond_actions[(_trans) as usize] != 0) {
                    {
                        match (_myanmar_syllable_machine_cond_actions[(_trans) as usize]) {
                            8 => {
                                te = p + 1;
                                {
                                    found_syllable!(SyllableType::ConsonantSyllable);
                                }
                            }
                            4 => {
                                te = p + 1;
                                {
                                    found_syllable!(SyllableType::NonMyanmarCluster);
                                }
                            }
                            10 => {
                                te = p + 1;
                                {
                                    found_syllable!(SyllableType::BrokenCluster);
                                    buffer.scratch_flags |=
                                        HB_BUFFER_SCRATCH_FLAG_HAS_BROKEN_SYLLABLE;
                                }
                            }
                            3 => {
                                te = p + 1;
                                {
                                    found_syllable!(SyllableType::NonMyanmarCluster);
                                }
                            }
                            7 => {
                                te = p;
                                p = p - 1;
                                {
                                    found_syllable!(SyllableType::ConsonantSyllable);
                                }
                            }
                            9 => {
                                te = p;
                                p = p - 1;
                                {
                                    found_syllable!(SyllableType::BrokenCluster);
                                    buffer.scratch_flags |=
                                        HB_BUFFER_SCRATCH_FLAG_HAS_BROKEN_SYLLABLE;
                                }
                            }
                            12 => {
                                te = p;
                                p = p - 1;
                                {
                                    found_syllable!(SyllableType::NonMyanmarCluster);
                                }
                            }
                            11 => match (act) {
                                2 => {
                                    p = (te) - 1;
                                    {
                                        found_syllable!(SyllableType::NonMyanmarCluster);
                                    }
                                }
                                3 => {
                                    p = (te) - 1;
                                    {
                                        found_syllable!(SyllableType::BrokenCluster);
                                        buffer.scratch_flags |=
                                            HB_BUFFER_SCRATCH_FLAG_HAS_BROKEN_SYLLABLE;
                                    }
                                }

                                _ => {}
                            },
                            6 => {
                                {
                                    {
                                        te = p + 1;
                                    }
                                }
                                {
                                    {
                                        act = 2;
                                    }
                                }
                            }
                            5 => {
                                {
                                    {
                                        te = p + 1;
                                    }
                                }
                                {
                                    {
                                        act = 3;
                                    }
                                }
                            }

                            _ => {}
                        }
                    }
                }
                break '_again;
            }
            if (p == eof) {
                {
                    if (cs >= 0) {
                        break '_resume;
                    }
                }
            } else {
                {
                    match (_myanmar_syllable_machine_to_state_actions[(cs) as usize]) {
                        1 => {
                            ts = 0;
                        }

                        _ => {}
                    }
                    p += 1;
                    continue '_resume;
                }
            }
            break '_resume;
        }
    }
}

#[inline]
fn found_syllable(
    start: usize,
    end: usize,
    syllable_serial: &mut u8,
    kind: SyllableType,
    buffer: &mut hb_buffer_t,
) {
    for i in start..end {
        buffer.info[i].set_syllable((*syllable_serial << 4) | kind as u8);
    }

    *syllable_serial += 1;

    if *syllable_serial == 16 {
        *syllable_serial = 1;
    }
}