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use super::ot_shape_normalize::*;
use super::ot_shaper::*;
use super::{hb_tag_t, unicode};
use crate::hb::buffer::hb_buffer_t;
use crate::hb::ot_layout::_hb_glyph_info_get_modified_combining_class;
use crate::hb::ot_shape_plan::hb_ot_shape_plan_t;
use crate::hb::unicode::modified_combining_class;
use unicode_ccc::CanonicalCombiningClass;
pub const HEBREW_SHAPER: hb_ot_shaper_t = hb_ot_shaper_t {
collect_features: None,
override_features: None,
create_data: None,
preprocess_text: None,
postprocess_glyphs: None,
normalization_preference: HB_OT_SHAPE_NORMALIZATION_MODE_AUTO,
decompose: None,
compose: Some(compose),
setup_masks: None,
gpos_tag: Some(hb_tag_t::from_bytes(b"hebr")),
reorder_marks: Some(reorder_marks_hebrew),
zero_width_marks: HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_LATE,
fallback_position: true,
};
fn reorder_marks_hebrew(
_: &hb_ot_shape_plan_t,
buffer: &mut hb_buffer_t,
start: usize,
end: usize,
) {
for i in start + 2..end {
let c0 = buffer.info[i - 2];
let c1 = buffer.info[i - 1];
let c2 = buffer.info[i - 0];
if (_hb_glyph_info_get_modified_combining_class(&c0) == modified_combining_class::CCC17
|| _hb_glyph_info_get_modified_combining_class(&c0) == modified_combining_class::CCC18) /* patach or qamats */
&&
(_hb_glyph_info_get_modified_combining_class(&c1) == modified_combining_class::CCC10
|| _hb_glyph_info_get_modified_combining_class(&c1) == modified_combining_class::CCC14) /* sheva or hiriq */ &&
(_hb_glyph_info_get_modified_combining_class(&c2) == modified_combining_class::CCC22
|| _hb_glyph_info_get_modified_combining_class(&c2) == CanonicalCombiningClass::Below as u8)
/* meteg or below */
{
buffer.merge_clusters(i - 1, i + 1);
buffer.info.swap(i - 1, i);
break;
}
}
}
const S_DAGESH_FORMS: &[char] = &[
'\u{FB30}', // ALEF
'\u{FB31}', // BET
'\u{FB32}', // GIMEL
'\u{FB33}', // DALET
'\u{FB34}', // HE
'\u{FB35}', // VAV
'\u{FB36}', // ZAYIN
'\u{0000}', // HET
'\u{FB38}', // TET
'\u{FB39}', // YOD
'\u{FB3A}', // FINAL KAF
'\u{FB3B}', // KAF
'\u{FB3C}', // LAMED
'\u{0000}', // FINAL MEM
'\u{FB3E}', // MEM
'\u{0000}', // FINAL NUN
'\u{FB40}', // NUN
'\u{FB41}', // SAMEKH
'\u{0000}', // AYIN
'\u{FB43}', // FINAL PE
'\u{FB44}', // PE
'\u{0000}', // FINAL TSADI
'\u{FB46}', // TSADI
'\u{FB47}', // QOF
'\u{FB48}', // RESH
'\u{FB49}', // SHIN
'\u{FB4A}', // TAV
];
fn compose(ctx: &hb_ot_shape_normalize_context_t, a: char, b: char) -> Option<char> {
// Hebrew presentation-form shaping.
// https://bugzilla.mozilla.org/show_bug.cgi?id=728866
// Hebrew presentation forms with dagesh, for characters U+05D0..05EA;
// Note that some letters do not have a dagesh presForm encoded.
match unicode::compose(a, b) {
Some(c) => Some(c),
None if !ctx.plan.has_gpos_mark => {
// Special-case Hebrew presentation forms that are excluded from
// standard normalization, but wanted for old fonts.
let a = a as u32;
let b = b as u32;
match b {
0x05B4 => {
// HIRIQ
match a {
0x05D9 => Some('\u{FB1D}'), // YOD
_ => None,
}
}
0x05B7 => {
// PATAH
match a {
0x05D9 => Some('\u{FB1F}'), // YIDDISH YOD YOD
0x05D0 => Some('\u{FB2E}'), // ALEF
_ => None,
}
}
0x05B8 => {
// QAMATS
match a {
0x05D0 => Some('\u{FB2F}'), // ALEF
_ => None,
}
}
0x05B9 => {
// HOLAM
match a {
0x05D5 => Some('\u{FB4B}'), // VAV
_ => None,
}
}
0x05BC => {
// DAGESH
match a {
0x05D0..=0x05EA => {
let c = S_DAGESH_FORMS[a as usize - 0x05D0];
if c != '\0' {
Some(c)
} else {
None
}
}
0xFB2A => Some('\u{FB2C}'), // SHIN WITH SHIN DOT
0xFB2B => Some('\u{FB2D}'), // SHIN WITH SIN DOT
_ => None,
}
}
0x05BF => {
// RAFE
match a {
0x05D1 => Some('\u{FB4C}'), // BET
0x05DB => Some('\u{FB4D}'), // KAF
0x05E4 => Some('\u{FB4E}'), // PE
_ => None,
}
}
0x05C1 => {
// SHIN DOT
match a {
0x05E9 => Some('\u{FB2A}'), // SHIN
0xFB49 => Some('\u{FB2C}'), // SHIN WITH DAGESH
_ => None,
}
}
0x05C2 => {
// SIN DOT
match a {
0x05E9 => Some('\u{FB2B}'), // SHIN
0xFB49 => Some('\u{FB2D}'), // SHIN WITH DAGESH
_ => None,
}
}
_ => None,
}
}
None => None,
}
}