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chore(unify): move re-used logic into a helper function for TagUnion and Func

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rvcas 2021-03-28 23:42:29 -04:00
parent 7013ad49f9
commit e4babd4445
1 changed files with 53 additions and 52 deletions
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105
compiler/unify/src/unify.rs
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@ -1072,60 +1072,10 @@ fn unify_flat_type(
}
}
(TagUnion(tags, ext), Func(args, closure, ret)) if tags.len() == 1 => {
let (tag_name, payload) = tags.iter().next().unwrap();
if payload.is_empty() {
let mut new_tags = MutMap::with_capacity_and_hasher(1, default_hasher());
new_tags.insert(tag_name.clone(), args.clone());
let content = Structure(TagUnion(new_tags, *ext));
let new_tag_union_var = fresh(subs, pool, ctx, content);
let problems = unify_pool(subs, pool, new_tag_union_var, *ret);
if problems.is_empty() {
let desc = subs.get(ctx.second);
subs.union(ctx.first, ctx.second, desc);
}
problems
} else {
mismatch!(
"Trying to unify two flat types that are incompatible: {:?} ~ {:?}",
TagUnion(tags.clone(), *ext),
Func(args.clone(), *closure, *ret)
)
}
unify_tag_union_and_func(tags, args, subs, pool, ctx, ext, ret, closure, true)
}
(Func(args, closure, ret), TagUnion(tags, ext)) if tags.len() == 1 => {
let (tag_name, payload) = tags.iter().next().unwrap();
if payload.is_empty() {
let mut new_tags = MutMap::with_capacity_and_hasher(1, default_hasher());
new_tags.insert(tag_name.clone(), args.clone());
let content = Structure(TagUnion(new_tags, *ext));
let new_tag_union_var = fresh(subs, pool, ctx, content);
let problems = unify_pool(subs, pool, *ret, new_tag_union_var);
if problems.is_empty() {
let desc = subs.get(ctx.first);
subs.union(ctx.first, ctx.second, desc);
}
problems
} else {
mismatch!(
"Trying to unify two flat types that are incompatible: {:?} ~ {:?}",
Func(args.clone(), *closure, *ret),
TagUnion(tags.clone(), *ext),
)
}
unify_tag_union_and_func(tags, args, subs, pool, ctx, ext, ret, closure, false)
}
(other1, other2) => mismatch!(
"Trying to unify two flat types that are incompatible: {:?} ~ {:?}",
@ -1308,3 +1258,54 @@ fn is_recursion_var(subs: &Subs, var: Variable) -> bool {
Content::RecursionVar { .. }
)
}
#[allow(clippy::too_many_arguments, clippy::ptr_arg)]
fn unify_tag_union_and_func(
tags: &MutMap<TagName, Vec<Variable>>,
args: &Vec<Variable>,
subs: &mut Subs,
pool: &mut Pool,
ctx: &Context,
ext: &Variable,
ret: &Variable,
closure: &Variable,
left: bool,
) -> Outcome {
use FlatType::*;
let (tag_name, payload) = tags.iter().next().unwrap();
if payload.is_empty() {
let mut new_tags = MutMap::with_capacity_and_hasher(1, default_hasher());
new_tags.insert(tag_name.clone(), args.to_owned());
let content = Structure(TagUnion(new_tags, *ext));
let new_tag_union_var = fresh(subs, pool, ctx, content);
let problems = if left {
unify_pool(subs, pool, new_tag_union_var, *ret)
} else {
unify_pool(subs, pool, *ret, new_tag_union_var)
};
if problems.is_empty() {
let desc = if left {
subs.get(ctx.second)
} else {
subs.get(ctx.first)
};
subs.union(ctx.first, ctx.second, desc);
}
problems
} else {
mismatch!(
"Trying to unify two flat types that are incompatible: {:?} ~ {:?}",
TagUnion(tags.clone(), *ext),
Func(args.to_owned(), *closure, *ret)
)
}
}