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|
//! Completion of names from the current scope in type position.
use hir::{HirDisplay, ScopeDef};
use syntax::{ast, AstNode, SyntaxKind};
use crate::{
context::{PathCompletionCtx, Qualified, TypeAscriptionTarget, TypeLocation},
render::render_type_inference,
CompletionContext, Completions,
};
pub(crate) fn complete_type_path(
acc: &mut Completions,
ctx: &CompletionContext<'_>,
path_ctx @ PathCompletionCtx { qualified, .. }: &PathCompletionCtx,
location: &TypeLocation,
) {
let _p = profile::span("complete_type_path");
let scope_def_applicable = |def| {
use hir::{GenericParam::*, ModuleDef::*};
match def {
ScopeDef::GenericParam(LifetimeParam(_)) | ScopeDef::Label(_) => false,
// no values in type places
ScopeDef::ModuleDef(Function(_) | Variant(_) | Static(_)) | ScopeDef::Local(_) => false,
// unless its a constant in a generic arg list position
ScopeDef::ModuleDef(Const(_)) | ScopeDef::GenericParam(ConstParam(_)) => {
matches!(location, TypeLocation::GenericArgList(_))
}
ScopeDef::ImplSelfType(_) => {
!matches!(location, TypeLocation::ImplTarget | TypeLocation::ImplTrait)
}
// Don't suggest attribute macros and derives.
ScopeDef::ModuleDef(Macro(mac)) => mac.is_fn_like(ctx.db),
// Type things are fine
ScopeDef::ModuleDef(BuiltinType(_) | Adt(_) | Module(_) | Trait(_) | TypeAlias(_))
| ScopeDef::AdtSelfType(_)
| ScopeDef::Unknown
| ScopeDef::GenericParam(TypeParam(_)) => true,
}
};
let add_assoc_item = |acc: &mut Completions, item| match item {
hir::AssocItem::Const(ct) if matches!(location, TypeLocation::GenericArgList(_)) => {
acc.add_const(ctx, ct)
}
hir::AssocItem::Function(_) | hir::AssocItem::Const(_) => (),
hir::AssocItem::TypeAlias(ty) => acc.add_type_alias(ctx, ty),
};
match qualified {
Qualified::TypeAnchor { ty: None, trait_: None } => ctx
.traits_in_scope()
.iter()
.flat_map(|&it| hir::Trait::from(it).items(ctx.sema.db))
.for_each(|item| add_assoc_item(acc, item)),
Qualified::TypeAnchor { trait_: Some(trait_), .. } => {
trait_.items(ctx.sema.db).into_iter().for_each(|item| add_assoc_item(acc, item))
}
Qualified::TypeAnchor { ty: Some(ty), trait_: None } => {
ctx.iterate_path_candidates(ty, |item| {
add_assoc_item(acc, item);
});
// Iterate assoc types separately
ty.iterate_assoc_items(ctx.db, ctx.krate, |item| {
if let hir::AssocItem::TypeAlias(ty) = item {
acc.add_type_alias(ctx, ty)
}
None::<()>
});
}
Qualified::With { resolution: None, .. } => {}
Qualified::With { resolution: Some(resolution), .. } => {
// Add associated types on type parameters and `Self`.
ctx.scope.assoc_type_shorthand_candidates(resolution, |_, alias| {
acc.add_type_alias(ctx, alias);
None::<()>
});
match resolution {
hir::PathResolution::Def(hir::ModuleDef::Module(module)) => {
let module_scope = module.scope(ctx.db, Some(ctx.module));
for (name, def) in module_scope {
if scope_def_applicable(def) {
acc.add_path_resolution(ctx, path_ctx, name, def);
}
}
}
hir::PathResolution::Def(
def @ (hir::ModuleDef::Adt(_)
| hir::ModuleDef::TypeAlias(_)
| hir::ModuleDef::BuiltinType(_)),
) => {
let ty = match def {
hir::ModuleDef::Adt(adt) => adt.ty(ctx.db),
hir::ModuleDef::TypeAlias(a) => a.ty(ctx.db),
hir::ModuleDef::BuiltinType(builtin) => builtin.ty(ctx.db),
_ => return,
};
// XXX: For parity with Rust bug #22519, this does not complete Ty::AssocType.
// (where AssocType is defined on a trait, not an inherent impl)
ctx.iterate_path_candidates(&ty, |item| {
add_assoc_item(acc, item);
});
// Iterate assoc types separately
ty.iterate_assoc_items(ctx.db, ctx.krate, |item| {
if let hir::AssocItem::TypeAlias(ty) = item {
acc.add_type_alias(ctx, ty)
}
None::<()>
});
}
hir::PathResolution::Def(hir::ModuleDef::Trait(t)) => {
// Handles `Trait::assoc` as well as `<Ty as Trait>::assoc`.
for item in t.items(ctx.db) {
add_assoc_item(acc, item);
}
}
hir::PathResolution::TypeParam(_) | hir::PathResolution::SelfType(_) => {
let ty = match resolution {
hir::PathResolution::TypeParam(param) => param.ty(ctx.db),
hir::PathResolution::SelfType(impl_def) => impl_def.self_ty(ctx.db),
_ => return,
};
ctx.iterate_path_candidates(&ty, |item| {
add_assoc_item(acc, item);
});
}
_ => (),
}
}
Qualified::Absolute => acc.add_crate_roots(ctx, path_ctx),
Qualified::No => {
match location {
TypeLocation::TypeBound => {
acc.add_nameref_keywords_with_colon(ctx);
ctx.process_all_names(&mut |name, res| {
let add_resolution = match res {
ScopeDef::ModuleDef(hir::ModuleDef::Macro(mac)) => {
mac.is_fn_like(ctx.db)
}
ScopeDef::ModuleDef(
hir::ModuleDef::Trait(_) | hir::ModuleDef::Module(_),
) => true,
_ => false,
};
if add_resolution {
acc.add_path_resolution(ctx, path_ctx, name, res);
}
});
return;
}
TypeLocation::GenericArgList(Some(arg_list)) => {
let in_assoc_type_arg = ctx
.original_token
.parent_ancestors()
.any(|node| node.kind() == SyntaxKind::ASSOC_TYPE_ARG);
if !in_assoc_type_arg {
if let Some(path_seg) =
arg_list.syntax().parent().and_then(ast::PathSegment::cast)
{
if path_seg
.syntax()
.ancestors()
.find_map(ast::TypeBound::cast)
.is_some()
{
if let Some(hir::PathResolution::Def(hir::ModuleDef::Trait(
trait_,
))) = ctx.sema.resolve_path(&path_seg.parent_path())
{
let arg_idx = arg_list
.generic_args()
.filter(|arg| {
arg.syntax().text_range().end()
< ctx.original_token.text_range().start()
})
.count();
let n_required_params =
trait_.type_or_const_param_count(ctx.sema.db, true);
if arg_idx >= n_required_params {
trait_
.items_with_supertraits(ctx.sema.db)
.into_iter()
.for_each(|it| {
if let hir::AssocItem::TypeAlias(alias) = it {
cov_mark::hit!(
complete_assoc_type_in_generics_list
);
acc.add_type_alias_with_eq(ctx, alias);
}
});
let n_params =
trait_.type_or_const_param_count(ctx.sema.db, false);
if arg_idx >= n_params {
return; // only show assoc types
}
}
}
}
}
}
}
_ => {}
};
acc.add_nameref_keywords_with_colon(ctx);
ctx.process_all_names(&mut |name, def| {
if scope_def_applicable(def) {
acc.add_path_resolution(ctx, path_ctx, name, def);
}
});
}
}
}
pub(crate) fn complete_ascribed_type(
acc: &mut Completions,
ctx: &CompletionContext<'_>,
path_ctx: &PathCompletionCtx,
ascription: &TypeAscriptionTarget,
) -> Option<()> {
if !path_ctx.is_trivial_path() {
return None;
}
let x = match ascription {
TypeAscriptionTarget::Let(pat) | TypeAscriptionTarget::FnParam(pat) => {
ctx.sema.type_of_pat(pat.as_ref()?)
}
TypeAscriptionTarget::Const(exp) | TypeAscriptionTarget::RetType(exp) => {
ctx.sema.type_of_expr(exp.as_ref()?)
}
}?
.adjusted();
let ty_string = x.display_source_code(ctx.db, ctx.module.into()).ok()?;
acc.add(render_type_inference(ty_string, ctx));
None
}
|
