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Simpliy code

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This commit is contained in:
Edwin Cheng 2019-04-17 01:47:59 +08:00
parent 0edb5ce97a
commit 039ab2e820
1 changed files with 32 additions and 60 deletions
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84
crates/ra_hir/src/ty/infer.rs
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@ -469,38 +469,21 @@ impl<'a, D: HirDatabase> InferenceContext<'a, D> {
let typable: Option<TypableDef> = def.into();
let typable = typable?;
// For example, this substs will take `Gen::make::*<u32>*`
let mut substs =
Ty::substs_from_path_segment(self.db, &self.resolver, segment, typable);
let mut ty = self.db.type_for_def(typable, Namespace::Types);
if remaining_index > 0 {
// For example, this substs will take `Gen::*<u32>*::make`
let parent_substs = Ty::substs_from_path_segment(
let substs = Ty::substs_from_path_segment(
self.db,
&self.resolver,
&path.segments[remaining_index - 1],
typable,
);
// merge parent and child substs
let max_len = std::cmp::max(substs.len(), parent_substs.len());
let mut merged = vec![];
for i in 0..max_len {
let s = match (substs.0.get(i), parent_substs.0.get(i)) {
(Some(s @ Ty::Apply(_)), _) => s,
(_, Some(s @ Ty::Apply(_))) => s,
(Some(s), _) => s,
(_, Some(s)) => s,
_ => unreachable!(),
};
merged.push(s.clone());
ty = ty.subst(&substs);
}
substs = Substs(merged.into());
}
let ty = self.db.type_for_def(typable, Namespace::Types);
ty.subst(&substs)
ty
}
Resolution::LocalBinding(_) => {
// can't have a local binding in an associated item path
@ -558,16 +541,8 @@ impl<'a, D: HirDatabase> InferenceContext<'a, D> {
match resolved {
Resolution::Def(def) => {
let typable: Option<TypableDef> = def.into();
let typable = typable?;
let ty = self.db.type_for_def(typable, Namespace::Values);
let substs = Ty::substs_from_path(self.db, &self.resolver, path, typable);
let ty = ty.subst(&substs);
let ty = self.insert_type_vars(ty);
// plug the old parent_ty in
let plug_self_types = || -> Option<()> {
// Helpper function for finding self types
let find_self_types = || -> Option<Substs> {
let actual_def_ty = actual_def_ty?;
if let crate::ModuleDef::Function(func) = def {
@ -577,43 +552,40 @@ impl<'a, D: HirDatabase> InferenceContext<'a, D> {
return None;
}
let impl_block = func.impl_block(self.db)?;
let impl_block = impl_block.target_ty(self.db);
let impl_block = func.impl_block(self.db)?.target_ty(self.db);
let impl_block_substs = impl_block.substs()?;
let actual_substs = actual_def_ty.substs()?;
// We save the impl block type params for later use
let old_params = impl_block.substs().unwrap().clone();
let mut new_substs = vec![Ty::Unknown; gen.count_parent_params()];
// Turn the impl block generic params to unknown
let mut subst = vec![];
for _ in 0..impl_block.substs().map(|x| x.len()).unwrap_or(0) {
subst.push(Ty::Unknown);
}
let impl_block = impl_block.subst(&Substs(subst.into()));
let impl_block = self.insert_type_vars(impl_block);
// Unify *self type* and impl_block
// e.g. Gen::<u32,u64> <=> Gen::<u64, T>
self.unify(&impl_block, &actual_def_ty);
// The following code *link up* the function parent generic param
// and the impl_block generic param by unify them one by one
if let Ty::Apply(ty) = &ty {
old_params.iter().zip(impl_block.substs()?.iter()).for_each(
// The following code *link up* the function actual parma type
// and impl_block type param index
impl_block_substs.iter().zip(actual_substs.iter()).for_each(
|(param, pty)| {
if let Ty::Param { idx, .. } = param {
self.unify(pty, &ty.parameters.0[*idx as usize]);
if let Some(s) = new_substs.get_mut(*idx as usize) {
*s = pty.clone();
}
}
},
);
}
return Some(());
}
Some(Substs(new_substs.into()))
} else {
None
}
};
plug_self_types();
let typable: Option<TypableDef> = def.into();
let typable = typable?;
let mut ty = self.db.type_for_def(typable, Namespace::Values);
if let Some(sts) = find_self_types() {
ty = ty.subst(&sts);
}
let substs = Ty::substs_from_path(self.db, &self.resolver, path, typable);
let ty = ty.subst(&substs);
let ty = self.insert_type_vars(ty);
Some(ty)
}
Resolution::LocalBinding(pat) => {