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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_shape_plan::hb_ot_shape_plan_t;
use crate::hb::unicode::Codepoint;
use crate::hb::unicode::{combining_class, modified_combining_class};
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::new(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 (c0.modified_combining_class() == modified_combining_class::CCC17
|| c0.modified_combining_class() == modified_combining_class::CCC18) /* patach or qamats */
&&
(c1.modified_combining_class() == modified_combining_class::CCC10
|| c1.modified_combining_class() == modified_combining_class::CCC14) /* sheva or hiriq */ &&
(c2.modified_combining_class() == modified_combining_class::CCC22
|| c2.modified_combining_class() == combining_class::Below)
/* meteg or below */
{
buffer.merge_clusters(i - 1, i + 1);
buffer.info.swap(i - 1, i);
break;
}
}
}
static S_DAGESH_FORMS: &[Codepoint] = &[
0xFB30, // ALEF
0xFB31, // BET
0xFB32, // GIMEL
0xFB33, // DALET
0xFB34, // HE
0xFB35, // VAV
0xFB36, // ZAYIN
0x0000, // HET
0xFB38, // TET
0xFB39, // YOD
0xFB3A, // FINAL KAF
0xFB3B, // KAF
0xFB3C, // LAMED
0x0000, // FINAL MEM
0xFB3E, // MEM
0x0000, // FINAL NUN
0xFB40, // NUN
0xFB41, // SAMEKH
0x0000, // AYIN
0xFB43, // FINAL PE
0xFB44, // PE
0x0000, // FINAL TSADI
0xFB46, // TSADI
0xFB47, // QOF
0xFB48, // RESH
0xFB49, // SHIN
0xFB4A, // TAV
];
fn compose(ctx: &hb_ot_shape_normalize_context_t, a: Codepoint, b: Codepoint) -> Option<Codepoint> {
// 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.
match b {
0x05B4 => {
// HIRIQ
match a {
0x05D9 => Some(0xFB1D), // YOD
_ => None,
}
}
0x05B7 => {
// PATAH
match a {
0x05D9 => Some(0xFB1F), // YIDDISH YOD YOD
0x05D0 => Some(0xFB2E), // ALEF
_ => None,
}
}
0x05B8 => {
// QAMATS
match a {
0x05D0 => Some(0xFB2F), // ALEF
_ => None,
}
}
0x05B9 => {
// HOLAM
match a {
0x05D5 => Some(0xFB4B), // 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(0xFB2C), // SHIN WITH SHIN DOT
0xFB2B => Some(0xFB2D), // SHIN WITH SIN DOT
_ => None,
}
}
0x05BF => {
// RAFE
match a {
0x05D1 => Some(0xFB4C), // BET
0x05DB => Some(0xFB4D), // KAF
0x05E4 => Some(0xFB4E), // PE
_ => None,
}
}
0x05C1 => {
// SHIN DOT
match a {
0x05E9 => Some(0xFB2A), // SHIN
0xFB49 => Some(0xFB2C), // SHIN WITH DAGESH
_ => None,
}
}
0x05C2 => {
// SIN DOT
match a {
0x05E9 => Some(0xFB2B), // SHIN
0xFB49 => Some(0xFB2D), // SHIN WITH DAGESH
_ => None,
}
}
_ => None,
}
}
None => None,
}
}