1use crate::hb::ot_layout::LayoutLookup;
2use crate::hb::ot_layout_common::SubstLookup;
3use crate::hb::ot_layout_gsubgpos::OT::hb_ot_apply_context_t;
4use crate::hb::ot_layout_gsubgpos::{Apply, WouldApply, WouldApplyContext};
5use crate::hb::set_digest::{hb_set_digest_ext, hb_set_digest_t};
6
7impl LayoutLookup for SubstLookup<'_> {
8 fn props(&self) -> u32 {
9 self.props
10 }
11
12 fn is_reverse(&self) -> bool {
13 self.reverse
14 }
15
16 fn digest(&self) -> &hb_set_digest_t {
17 &self.set_digest
18 }
19}
20
21impl WouldApply for SubstLookup<'_> {
22 fn would_apply(&self, ctx: &WouldApplyContext) -> bool {
23 self.digest().may_have_glyph(ctx.glyphs[0])
24 && self
25 .subtables
26 .iter()
27 .any(|subtable: &SubstitutionSubtable<'_>| subtable.would_apply(ctx))
28 }
29}
30
31impl Apply for SubstLookup<'_> {
32 fn apply(&self, ctx: &mut hb_ot_apply_context_t) -> Option<()> {
33 if self.digest().may_have_glyph(ctx.buffer.cur(0).as_glyph()) {
34 for subtable: &SubstitutionSubtable<'_> in &self.subtables {
35 if subtable.apply(ctx).is_some() {
36 return Some(());
37 }
38 }
39 }
40
41 None
42 }
43}
44