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use crate::UncompileContext;
use fea_rs_ast::{ChainedContextStatement, GlyphContainer, SubOrPos};
use skrifa::raw::{
ReadError,
tables::{gsub::ChainedSequenceContext, layout::SequenceContext},
};
use std::collections::HashMap;
impl<'a> UncompileContext<'a> {
pub(crate) fn class_members_to_container(
&self,
members: Vec<GlyphContainer>,
) -> GlyphContainer {
if members.len() == 1 {
members.into_iter().next().unwrap()
} else {
GlyphContainer::GlyphClass(fea_rs_ast::GlyphClass::new(members, 0..0))
}
}
pub(crate) fn uncompile_sequence_context<T: SubOrPos>(
&mut self,
sequence: SequenceContext,
sub_or_pos: T,
) -> Result<Vec<ChainedContextStatement<T>>, ReadError> {
let mut statements = vec![];
match sequence {
SequenceContext::Format1(seq_f1) => {
let first_glyphs = seq_f1
.coverage()?
.iter()
.map(|g| GlyphContainer::GlyphName(self.get_name(g)))
.collect::<Vec<GlyphContainer>>();
for (first_glyph, ruleset) in first_glyphs.iter().zip(seq_f1.seq_rule_sets().iter())
{
if let Some(ruleset) = ruleset.transpose()? {
for rule in ruleset.seq_rules().iter().flatten() {
let mut input: Vec<_> = rule
.input_sequence()
.iter()
.map(|g| GlyphContainer::GlyphName(self.get_name(g.get())))
.collect();
input.insert(0, first_glyph.clone());
let mut lookups = vec![vec![]; input.len()];
for lookup_record in rule.seq_lookup_records() {
if let Some(lu) =
lookups.get_mut(lookup_record.sequence_index() as usize)
{
lu.push(self.get_lookup_name(
lookup_record.lookup_list_index(),
sub_or_pos,
));
}
}
let statement = ChainedContextStatement::new(
input,
vec![],
vec![],
lookups,
0..0,
sub_or_pos,
);
statements.push(statement);
}
}
}
}
SequenceContext::Format2(_table_ref) => {
let table_ref = _table_ref;
let class_def = table_ref.class_def()?;
let classes = self.resolve_classes(Some(&class_def));
let mut covered_input_classes: HashMap<u16, Vec<GlyphContainer>> = HashMap::new();
for gid in table_ref.coverage()?.iter() {
let class_id = class_def.get(gid);
covered_input_classes
.entry(class_id)
.or_default()
.push(GlyphContainer::GlyphName(self.get_name(gid)));
}
for (class_id, ruleset) in table_ref.class_seq_rule_sets().iter().enumerate() {
let Some(ruleset) = ruleset.transpose()? else {
continue;
};
let Some(first_class_members) = covered_input_classes.get(&(class_id as u16))
else {
continue;
};
let first = self.class_members_to_container(first_class_members.clone());
for rule in ruleset.class_seq_rules().iter().flatten() {
let mut input = vec![first.clone()];
input.extend(rule.input_sequence().iter().map(|class_id| {
self.class_members_to_container(
classes.get(&class_id.get()).cloned().unwrap_or_default(),
)
}));
let mut lookups = vec![vec![]; input.len()];
for lookup_record in rule.seq_lookup_records() {
if let Some(lu) =
lookups.get_mut(lookup_record.sequence_index() as usize)
{
lu.push(self.get_lookup_name(
lookup_record.lookup_list_index(),
sub_or_pos,
));
}
}
let statement = ChainedContextStatement::new(
input,
vec![],
vec![],
lookups,
0..0,
sub_or_pos,
);
statements.push(statement);
}
}
}
SequenceContext::Format3(table_ref) => {
let input: Vec<GlyphContainer> = table_ref
.coverages()
.iter()
.flatten()
.map(|coverage| self.resolve_coverage_to_class(&coverage, true))
.collect();
let mut lookups = vec![vec![]; input.len()];
for lookup_record in table_ref.seq_lookup_records() {
if let Some(lu) = lookups.get_mut(lookup_record.sequence_index() as usize) {
lu.push(
self.get_lookup_name(lookup_record.lookup_list_index(), sub_or_pos),
);
}
}
let statement =
ChainedContextStatement::new(input, vec![], vec![], lookups, 0..0, sub_or_pos);
statements.push(statement);
}
}
Ok(statements)
}
pub fn uncompile_chain_sequence_context<T: SubOrPos>(
&mut self,
chainsequence: ChainedSequenceContext,
sub_or_pos: T,
) -> Result<Vec<ChainedContextStatement<T>>, ReadError> {
let mut statements = vec![];
match chainsequence {
ChainedSequenceContext::Format1(seq_f1) => {
let first_glyphs = seq_f1
.coverage()?
.iter()
.map(|g| GlyphContainer::GlyphName(self.get_name(g)))
.collect::<Vec<GlyphContainer>>();
for (first_glyph, ruleset) in first_glyphs
.iter()
.zip(seq_f1.chained_seq_rule_sets().iter())
{
if let Some(ruleset) = ruleset.transpose()? {
for rule in ruleset.chained_seq_rules().iter().flatten() {
let mut input: Vec<_> = rule
.input_sequence()
.iter()
.map(|g| GlyphContainer::GlyphName(self.get_name(g.get())))
.collect();
input.insert(0, first_glyph.clone());
let prefix = rule
.backtrack_sequence()
.iter()
.rev()
.map(|g| GlyphContainer::GlyphName(self.get_name(g.get())))
.collect::<Vec<GlyphContainer>>();
let suffix = rule
.lookahead_sequence()
.iter()
.map(|g| GlyphContainer::GlyphName(self.get_name(g.get())))
.collect::<Vec<GlyphContainer>>();
let mut lookups = vec![vec![]; input.len()];
for lookup_record in rule.seq_lookup_records() {
if let Some(lu) =
lookups.get_mut(lookup_record.sequence_index() as usize)
{
lu.push(self.get_lookup_name(
lookup_record.lookup_list_index(),
sub_or_pos,
));
}
}
let statement = ChainedContextStatement::new(
input,
prefix,
suffix,
lookups,
0..0,
sub_or_pos,
);
statements.push(statement);
}
}
}
}
ChainedSequenceContext::Format2(_table_ref) => {
let table_ref = _table_ref;
let input_class_def = table_ref.input_class_def().ok();
let backtrack_class_def = table_ref.backtrack_class_def().ok();
let lookahead_class_def = table_ref.lookahead_class_def().ok();
let input_classes = self.resolve_classes(input_class_def.as_ref());
let backtrack_classes = self.resolve_classes(backtrack_class_def.as_ref());
let lookahead_classes = self.resolve_classes(lookahead_class_def.as_ref());
let mut covered_input_classes: HashMap<u16, Vec<GlyphContainer>> = HashMap::new();
for gid in table_ref.coverage()?.iter() {
let class_id = input_class_def
.as_ref()
.map_or(0, |class_def| class_def.get(gid));
covered_input_classes
.entry(class_id)
.or_default()
.push(GlyphContainer::GlyphName(self.get_name(gid)));
}
for (class_id, ruleset) in
table_ref.chained_class_seq_rule_sets().iter().enumerate()
{
let Some(ruleset) = ruleset.transpose()? else {
continue;
};
let Some(first_class_members) = covered_input_classes.get(&(class_id as u16))
else {
continue;
};
let first = self.class_members_to_container(first_class_members.clone());
for rule in ruleset.chained_class_seq_rules().iter().flatten() {
let mut input = vec![first.clone()];
input.extend(rule.input_sequence().iter().map(|class_id| {
self.class_members_to_container(
input_classes
.get(&class_id.get())
.cloned()
.unwrap_or_default(),
)
}));
let mut prefix: Vec<GlyphContainer> = rule
.backtrack_sequence()
.iter()
.map(|class_id| {
self.class_members_to_container(
backtrack_classes
.get(&class_id.get())
.cloned()
.unwrap_or_default(),
)
})
.collect();
prefix.reverse();
let suffix: Vec<GlyphContainer> = rule
.lookahead_sequence()
.iter()
.map(|class_id| {
self.class_members_to_container(
lookahead_classes
.get(&class_id.get())
.cloned()
.unwrap_or_default(),
)
})
.collect();
let mut lookups = vec![vec![]; input.len()];
for lookup_record in rule.seq_lookup_records() {
if let Some(lu) =
lookups.get_mut(lookup_record.sequence_index() as usize)
{
lu.push(self.get_lookup_name(
lookup_record.lookup_list_index(),
sub_or_pos,
));
}
}
let statement = ChainedContextStatement::new(
input,
prefix,
suffix,
lookups,
0..0,
sub_or_pos,
);
statements.push(statement);
}
}
}
ChainedSequenceContext::Format3(table_ref) => {
let input: Vec<GlyphContainer> = table_ref
.input_coverages()
.iter()
.flatten()
.map(|coverage| self.resolve_coverage_to_class(&coverage, true))
.collect();
let mut pre: Vec<GlyphContainer> = table_ref
.backtrack_coverages()
.iter()
.flatten()
.map(|coverage| self.resolve_coverage_to_class(&coverage, true))
.collect();
pre.reverse();
let post: Vec<GlyphContainer> = table_ref
.lookahead_coverages()
.iter()
.flatten()
.map(|coverage| self.resolve_coverage_to_class(&coverage, true))
.collect();
let mut lookups = vec![vec![]; input.len()];
for lookup_record in table_ref.seq_lookup_records() {
if let Some(lu) = lookups.get_mut(lookup_record.sequence_index() as usize) {
lu.push(
self.get_lookup_name(lookup_record.lookup_list_index(), sub_or_pos),
);
}
}
let statement =
ChainedContextStatement::new(input, pre, post, lookups, 0..0, sub_or_pos);
statements.push(statement);
}
}
Ok(statements)
}
}