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Auto merge of #15054 - ponyii:fix/implement-missing-members-do-not-transform-const-params, r=lowr

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fix: implement missing members doesn't transform const params and default types

Fixes https://github.com/rust-lang/rust-analyzer/issues/13363
This commit is contained in:
bors 2023-06-18 09:30:13 +00:00
commit a1b536ec6f
3 changed files with 274 additions and 49 deletions
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175
crates/ide-assists/src/handlers/add_missing_impl_members.rs
View File

@ -400,6 +400,72 @@ impl<'x, 'y, T, V, U: Default> Trait<'x, 'y, T, V, U> for () {
);
}
#[test]
fn test_const_substitution() {
check_assist(
add_missing_default_members,
r#"
struct Bar<const: N: bool> {
bar: [i32, N]
}
trait Foo<const N: usize, T> {
fn get_n_sq(&self, arg: &T) -> usize { N * N }
fn get_array(&self, arg: Bar<N>) -> [i32; N] { [1; N] }
}
struct S<T> {
wrapped: T
}
impl<const X: usize, Y, Z> Foo<X, Z> for S<Y> {
$0
}"#,
r#"
struct Bar<const: N: bool> {
bar: [i32, N]
}
trait Foo<const N: usize, T> {
fn get_n_sq(&self, arg: &T) -> usize { N * N }
fn get_array(&self, arg: Bar<N>) -> [i32; N] { [1; N] }
}
struct S<T> {
wrapped: T
}
impl<const X: usize, Y, Z> Foo<X, Z> for S<Y> {
$0fn get_n_sq(&self, arg: &Z) -> usize { X * X }
fn get_array(&self, arg: Bar<X>) -> [i32; X] { [1; X] }
}"#,
)
}
#[test]
fn test_const_substitution_2() {
check_assist(
add_missing_default_members,
r#"
trait Foo<const N: usize, const M: usize, T> {
fn get_sum(&self, arg: &T) -> usize { N + M }
}
impl<X> Foo<42, {20 + 22}, X> for () {
$0
}"#,
r#"
trait Foo<const N: usize, const M: usize, T> {
fn get_sum(&self, arg: &T) -> usize { N + M }
}
impl<X> Foo<42, {20 + 22}, X> for () {
$0fn get_sum(&self, arg: &X) -> usize { 42 + {20 + 22} }
}"#,
)
}
#[test]
fn test_cursor_after_empty_impl_def() {
check_assist(
@ -781,6 +847,115 @@ impl Foo<T> for S<T> {
)
}
#[test]
fn test_qualify_generic_default_parameter() {
check_assist(
add_missing_impl_members,
r#"
mod m {
pub struct S;
pub trait Foo<T = S> {
fn bar(&self, other: &T);
}
}
struct S;
impl m::Foo for S { $0 }"#,
r#"
mod m {
pub struct S;
pub trait Foo<T = S> {
fn bar(&self, other: &T);
}
}
struct S;
impl m::Foo for S {
fn bar(&self, other: &m::S) {
${0:todo!()}
}
}"#,
)
}
#[test]
fn test_qualify_generic_default_parameter_2() {
check_assist(
add_missing_impl_members,
r#"
mod m {
pub struct Wrapper<T, V> {
one: T,
another: V
};
pub struct S;
pub trait Foo<T = Wrapper<S, bool>> {
fn bar(&self, other: &T);
}
}
struct S;
impl m::Foo for S { $0 }"#,
r#"
mod m {
pub struct Wrapper<T, V> {
one: T,
another: V
};
pub struct S;
pub trait Foo<T = Wrapper<S, bool>> {
fn bar(&self, other: &T);
}
}
struct S;
impl m::Foo for S {
fn bar(&self, other: &m::Wrapper<m::S, bool>) {
${0:todo!()}
}
}"#,
);
}
#[test]
fn test_qualify_generic_default_parameter_3() {
check_assist(
add_missing_impl_members,
r#"
mod m {
pub struct Wrapper<T, V> {
one: T,
another: V
};
pub struct S;
pub trait Foo<T = S, V = Wrapper<T, S>> {
fn bar(&self, other: &V);
}
}
struct S;
impl m::Foo for S { $0 }"#,
r#"
mod m {
pub struct Wrapper<T, V> {
one: T,
another: V
};
pub struct S;
pub trait Foo<T = S, V = Wrapper<T, S>> {
fn bar(&self, other: &V);
}
}
struct S;
impl m::Foo for S {
fn bar(&self, other: &m::Wrapper<m::S, m::S>) {
${0:todo!()}
}
}"#,
);
}
#[test]
fn test_assoc_type_bounds_are_removed() {
check_assist(

3
crates/ide-assists/src/handlers/inline_call.rs
View File

@ -958,7 +958,6 @@ fn main() {
);
}
// FIXME: const generics aren't being substituted, this is blocked on better support for them
#[test]
fn inline_substitutes_generics() {
check_assist(
@ -982,7 +981,7 @@ fn foo<T, const N: usize>() {
fn bar<U, const M: usize>() {}
fn main() {
bar::<usize, N>();
bar::<usize, {0}>();
}
"#,
);

145
crates/ide-db/src/path_transform.rs
View File

@ -11,10 +11,15 @@ use syntax::{
#[derive(Default)]
struct AstSubsts {
types: Vec<ast::TypeArg>,
types_and_consts: Vec<TypeOrConst>,
lifetimes: Vec<ast::LifetimeArg>,
}
enum TypeOrConst {
Either(ast::TypeArg), // indistinguishable type or const param
Const(ast::ConstArg),
}
type LifetimeName = String;
/// `PathTransform` substitutes path in SyntaxNodes in bulk.
@ -108,8 +113,10 @@ impl<'a> PathTransform<'a> {
Some(hir::GenericDef::Trait(_)) => 1,
_ => 0,
};
let type_substs: FxHashMap<_, _> = self
.generic_def
let mut type_substs: FxHashMap<hir::TypeParam, ast::Type> = Default::default();
let mut const_substs: FxHashMap<hir::ConstParam, SyntaxNode> = Default::default();
let mut default_types: Vec<hir::TypeParam> = Default::default();
self.generic_def
.into_iter()
.flat_map(|it| it.type_params(db))
.skip(skip)
@ -119,21 +126,41 @@ impl<'a> PathTransform<'a> {
// can still hit those trailing values and check if they actually have
// a default type. If they do, go for that type from `hir` to `ast` so
// the resulting change can be applied correctly.
.zip(self.substs.types.iter().map(Some).chain(std::iter::repeat(None)))
.filter_map(|(k, v)| match k.split(db) {
Either::Left(_) => None, // FIXME: map const types too
Either::Right(t) => match v {
Some(v) => Some((k, v.ty()?.clone())),
None => {
let default = t.default(db)?;
let v = ast::make::ty(
&default.display_source_code(db, source_module.into(), false).ok()?,
);
Some((k, v))
.zip(self.substs.types_and_consts.iter().map(Some).chain(std::iter::repeat(None)))
.for_each(|(k, v)| match (k.split(db), v) {
(Either::Right(k), Some(TypeOrConst::Either(v))) => {
if let Some(ty) = v.ty() {
type_substs.insert(k, ty.clone());
}
},
})
.collect();
}
(Either::Right(k), None) => {
if let Some(default) = k.default(db) {
if let Some(default) =
&default.display_source_code(db, source_module.into(), false).ok()
{
type_substs.insert(k, ast::make::ty(default).clone_for_update());
default_types.push(k);
}
}
}
(Either::Left(k), Some(TypeOrConst::Either(v))) => {
if let Some(ty) = v.ty() {
const_substs.insert(k, ty.syntax().clone());
}
}
(Either::Left(k), Some(TypeOrConst::Const(v))) => {
if let Some(expr) = v.expr() {
// FIXME: expressions in curly brackets can cause ambiguity after insertion
// (e.g. `N * 2` -> `{1 + 1} * 2`; it's unclear whether `{1 + 1}`
// is a standalone statement or a part of another expresson)
// and sometimes require slight modifications; see
// https://doc.rust-lang.org/reference/statements.html#expression-statements
const_substs.insert(k, expr.syntax().clone());
}
}
(Either::Left(_), None) => (), // FIXME: get default const value
_ => (), // ignore mismatching params
});
let lifetime_substs: FxHashMap<_, _> = self
.generic_def
.into_iter()
@ -141,50 +168,61 @@ impl<'a> PathTransform<'a> {
.zip(self.substs.lifetimes.clone())
.filter_map(|(k, v)| Some((k.name(db).display(db.upcast()).to_string(), v.lifetime()?)))
.collect();
Ctx { type_substs, lifetime_substs, target_module, source_scope: self.source_scope }
let ctx = Ctx {
type_substs,
const_substs,
lifetime_substs,
target_module,
source_scope: self.source_scope,
};
ctx.transform_default_type_substs(default_types);
ctx
}
}
struct Ctx<'a> {
type_substs: FxHashMap<hir::TypeOrConstParam, ast::Type>,
type_substs: FxHashMap<hir::TypeParam, ast::Type>,
const_substs: FxHashMap<hir::ConstParam, SyntaxNode>,
lifetime_substs: FxHashMap<LifetimeName, ast::Lifetime>,
target_module: hir::Module,
source_scope: &'a SemanticsScope<'a>,
}
fn postorder(item: &SyntaxNode) -> impl Iterator<Item = SyntaxNode> {
item.preorder().filter_map(|event| match event {
syntax::WalkEvent::Enter(_) => None,
syntax::WalkEvent::Leave(node) => Some(node),
})
}
impl<'a> Ctx<'a> {
fn apply(&self, item: &SyntaxNode) {
// `transform_path` may update a node's parent and that would break the
// tree traversal. Thus all paths in the tree are collected into a vec
// so that such operation is safe.
let paths = item
.preorder()
.filter_map(|event| match event {
syntax::WalkEvent::Enter(_) => None,
syntax::WalkEvent::Leave(node) => Some(node),
})
.filter_map(ast::Path::cast)
.collect::<Vec<_>>();
let paths = postorder(item).filter_map(ast::Path::cast).collect::<Vec<_>>();
for path in paths {
self.transform_path(path);
}
item.preorder()
.filter_map(|event| match event {
syntax::WalkEvent::Enter(_) => None,
syntax::WalkEvent::Leave(node) => Some(node),
})
.filter_map(ast::Lifetime::cast)
.for_each(|lifetime| {
if let Some(subst) = self.lifetime_substs.get(&lifetime.syntax().text().to_string())
{
ted::replace(
lifetime.syntax(),
subst.clone_subtree().clone_for_update().syntax(),
);
}
});
postorder(item).filter_map(ast::Lifetime::cast).for_each(|lifetime| {
if let Some(subst) = self.lifetime_substs.get(&lifetime.syntax().text().to_string()) {
ted::replace(lifetime.syntax(), subst.clone_subtree().clone_for_update().syntax());
}
});
}
fn transform_default_type_substs(&self, default_types: Vec<hir::TypeParam>) {
for k in default_types {
let v = self.type_substs.get(&k).unwrap();
// `transform_path` may update a node's parent and that would break the
// tree traversal. Thus all paths in the tree are collected into a vec
// so that such operation is safe.
let paths = postorder(&v.syntax()).filter_map(ast::Path::cast).collect::<Vec<_>>();
for path in paths {
self.transform_path(path);
}
}
}
fn transform_path(&self, path: ast::Path) -> Option<()> {
@ -203,7 +241,7 @@ impl<'a> Ctx<'a> {
match resolution {
hir::PathResolution::TypeParam(tp) => {
if let Some(subst) = self.type_substs.get(&tp.merge()) {
if let Some(subst) = self.type_substs.get(&tp) {
let parent = path.syntax().parent()?;
if let Some(parent) = ast::Path::cast(parent.clone()) {
// Path inside path means that there is an associated
@ -270,8 +308,12 @@ impl<'a> Ctx<'a> {
}
ted::replace(path.syntax(), res.syntax())
}
hir::PathResolution::ConstParam(cp) => {
if let Some(subst) = self.const_substs.get(&cp) {
ted::replace(path.syntax(), subst.clone_subtree().clone_for_update());
}
}
hir::PathResolution::Local(_)
| hir::PathResolution::ConstParam(_)
| hir::PathResolution::SelfType(_)
| hir::PathResolution::Def(_)
| hir::PathResolution::BuiltinAttr(_)
@ -298,9 +340,18 @@ fn get_syntactic_substs(impl_def: ast::Impl) -> Option<AstSubsts> {
fn get_type_args_from_arg_list(generic_arg_list: ast::GenericArgList) -> Option<AstSubsts> {
let mut result = AstSubsts::default();
generic_arg_list.generic_args().for_each(|generic_arg| match generic_arg {
ast::GenericArg::TypeArg(type_arg) => result.types.push(type_arg),
// Const params are marked as consts on definition only,
// being passed to the trait they are indistguishable from type params;
// anyway, we don't really need to distinguish them here.
ast::GenericArg::TypeArg(type_arg) => {
result.types_and_consts.push(TypeOrConst::Either(type_arg))
}
// Some const values are recognized correctly.
ast::GenericArg::ConstArg(const_arg) => {
result.types_and_consts.push(TypeOrConst::Const(const_arg));
}
ast::GenericArg::LifetimeArg(l_arg) => result.lifetimes.push(l_arg),
_ => (), // FIXME: don't filter out const params
_ => (),
});
Some(result)