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Derive key for Decoding tuples

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Ayaz Hafiz 2023-03-22 12:23:16 -05:00
parent 92aff265ae
commit 5e0a6e5926
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3 changed files with 20 additions and 3 deletions
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14
crates/compiler/derive_key/src/decoding.rs
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@ -2,7 +2,7 @@ use roc_module::{ident::Lowercase, symbol::Symbol};
use roc_types::subs::{Content, FlatType, Subs, Variable};
use crate::{
util::{check_derivable_ext_var, debug_name_record},
util::{check_derivable_ext_var, debug_name_record, debug_name_tuple},
DeriveError,
};
@ -18,6 +18,7 @@ pub enum FlatDecodableKey {
// Unfortunate that we must allocate here, c'est la vie
Record(Vec<Lowercase>),
Tuple(u32),
}
impl FlatDecodableKey {
@ -25,6 +26,7 @@ impl FlatDecodableKey {
match self {
FlatDecodableKey::List() => "list".to_string(),
FlatDecodableKey::Record(fields) => debug_name_record(fields),
FlatDecodableKey::Tuple(arity) => debug_name_tuple(*arity),
}
}
}
@ -61,8 +63,14 @@ impl FlatDecodable {
Ok(Key(FlatDecodableKey::Record(field_names)))
}
FlatType::Tuple(_elems, _ext) => {
todo!()
FlatType::Tuple(elems, ext) => {
let (elems_iter, ext) = elems.sorted_iterator_and_ext(subs, ext);
check_derivable_ext_var(subs, ext, |ext| {
matches!(ext, Content::Structure(FlatType::EmptyTuple))
})?;
Ok(Key(FlatDecodableKey::Tuple(elems_iter.count() as _)))
}
FlatType::TagUnion(_tags, _ext) | FlatType::RecursiveTagUnion(_, _tags, _ext) => {
Err(Underivable) // yet