FIX: generic parameters handling by the generate_delegate_trait assist
#15520
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@Veykril, hello! It seems natural to request your review here |
crates/hir-def/src/item_tree.rs
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| #[derive(Debug, Clone, Eq, PartialEq, Hash)] | ||
| pub struct GenericParamGroups { | ||
| // pub target_trait: Option<Vec<String>>, | ||
| pub self_ty: Option<Vec<String>>, | ||
| } | ||
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| impl GenericParamGroups { | ||
| fn from_impl(impl_: &ast::Impl) -> Self { | ||
| Self { | ||
| // target_trait: Self::get_arg_list(impl_.trait_()), | ||
| self_ty: Self::get_arg_list(impl_.self_ty()), | ||
| } | ||
| } | ||
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| fn get_arg_list(ty: Option<ast::Type>) -> Option<Vec<String>> { | ||
| let list = match ty? { | ||
| ast::Type::PathType(p) => p.path()?.segment()?.generic_arg_list(), | ||
| _ => None, | ||
| }; | ||
| Some(list?.generic_args().map(|arg| arg.syntax().text().to_string()).collect()) | ||
| } | ||
| } | ||
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This is the wrong way too approach this. The fix to the issue here should not involve touching item tree whatsoever.
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I have to touch it, I'm afraid.
Let's have a look on few relevant lines from the test:
struct S(Foo<i32, bool>);
...
impl<A, B, C> Trait<A, B> for Foo<C, B> { ... }
In this case the assist should turn C and B into i32 and bool repectively. In general, it should get Foo-related generic arguments from the trait implementation and correlate them Foo's parameters within the structure. Consequently, we have to memorize the "distribution" of the generic arguments in impl lines; that's exactly what happens in this file - the names of args pertaining to self_ty are being saved.
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That data is already encoded in the sekf_ty TypeRef in the item tree. So you just need to fetch that from there instead, that is check if the TypeRef is a TypeRef::Path and take the generic args from that path instead
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Thank you! Now these data are fetched from Type instead of TypeRef, but anyway the item tree is unchanged
Veykril
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☔ The latest upstream changes (presumably #15891) made this pull request unmergeable. Please resolve the merge conflicts. |
Veykril
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The linked issue has been fixed by a heavy rewrite of the assist in #16112, so sorry for not merging this now, but thanks anyways for your contribution! |
A part of #15108
I'm going to write a separate PR to solve the problem completely; currently only
implbofy generation is fixed, but generation of theimpl ...line itself is to be overhauled.The code might look somewhat complicated, but basically the changes are as follows:
item_tree.rs);generate_delegate_trait.rs)