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|
//! Completes constants and paths in unqualified patterns.
use hir::{db::DefDatabase, AssocItem, ScopeDef};
use syntax::ast::Pat;
use crate::{
context::{PathCompletionCtx, PatternContext, PatternRefutability, Qualified},
CompletionContext, Completions,
};
/// Completes constants and paths in unqualified patterns.
pub(crate) fn complete_pattern(
acc: &mut Completions,
ctx: &CompletionContext<'_>,
pattern_ctx: &PatternContext,
) {
match pattern_ctx.parent_pat.as_ref() {
Some(Pat::RangePat(_) | Pat::BoxPat(_)) => (),
Some(Pat::RefPat(r)) => {
if r.mut_token().is_none() {
acc.add_keyword(ctx, "mut");
}
}
_ => {
let tok = ctx.token.text_range().start();
match (pattern_ctx.ref_token.as_ref(), pattern_ctx.mut_token.as_ref()) {
(None, None) => {
acc.add_keyword(ctx, "ref");
acc.add_keyword(ctx, "mut");
}
(None, Some(m)) if tok < m.text_range().start() => {
acc.add_keyword(ctx, "ref");
}
(Some(r), None) if tok > r.text_range().end() => {
acc.add_keyword(ctx, "mut");
}
_ => (),
}
}
}
if pattern_ctx.record_pat.is_some() {
return;
}
let refutable = pattern_ctx.refutability == PatternRefutability::Refutable;
let single_variant_enum = |enum_: hir::Enum| ctx.db.enum_data(enum_.into()).variants.len() == 1;
if let Some(hir::Adt::Enum(e)) =
ctx.expected_type.as_ref().and_then(|ty| ty.strip_references().as_adt())
{
if refutable || single_variant_enum(e) {
super::enum_variants_with_paths(
acc,
ctx,
e,
&pattern_ctx.impl_,
|acc, ctx, variant, path| {
acc.add_qualified_variant_pat(ctx, pattern_ctx, variant, path);
},
);
}
}
// FIXME: ideally, we should look at the type we are matching against and
// suggest variants + auto-imports
ctx.process_all_names(&mut |name, res| {
let add_simple_path = match res {
hir::ScopeDef::ModuleDef(def) => match def {
hir::ModuleDef::Adt(hir::Adt::Struct(strukt)) => {
acc.add_struct_pat(ctx, pattern_ctx, strukt, Some(name.clone()));
true
}
hir::ModuleDef::Variant(variant)
if refutable || single_variant_enum(variant.parent_enum(ctx.db)) =>
{
acc.add_variant_pat(ctx, pattern_ctx, None, variant, Some(name.clone()));
true
}
hir::ModuleDef::Adt(hir::Adt::Enum(e)) => refutable || single_variant_enum(e),
hir::ModuleDef::Const(..) => refutable,
hir::ModuleDef::Module(..) => true,
hir::ModuleDef::Macro(mac) => mac.is_fn_like(ctx.db),
_ => false,
},
hir::ScopeDef::ImplSelfType(impl_) => match impl_.self_ty(ctx.db).as_adt() {
Some(hir::Adt::Struct(strukt)) => {
acc.add_struct_pat(ctx, pattern_ctx, strukt, Some(name.clone()));
true
}
Some(hir::Adt::Enum(e)) => refutable || single_variant_enum(e),
Some(hir::Adt::Union(_)) => true,
_ => false,
},
ScopeDef::GenericParam(hir::GenericParam::ConstParam(_)) => true,
ScopeDef::GenericParam(_)
| ScopeDef::AdtSelfType(_)
| ScopeDef::Local(_)
| ScopeDef::Label(_)
| ScopeDef::Unknown => false,
};
if add_simple_path {
acc.add_pattern_resolution(ctx, pattern_ctx, name, res);
}
});
}
pub(crate) fn complete_pattern_path(
acc: &mut Completions,
ctx: &CompletionContext<'_>,
path_ctx @ PathCompletionCtx { qualified, .. }: &PathCompletionCtx,
) {
match qualified {
Qualified::With { resolution: Some(resolution), super_chain_len, .. } => {
acc.add_super_keyword(ctx, *super_chain_len);
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 {
let add_resolution = match def {
ScopeDef::ModuleDef(hir::ModuleDef::Macro(mac)) => {
mac.is_fn_like(ctx.db)
}
ScopeDef::ModuleDef(_) => true,
_ => false,
};
if add_resolution {
acc.add_path_resolution(ctx, path_ctx, name, def);
}
}
}
res => {
let ty = match res {
hir::PathResolution::TypeParam(param) => param.ty(ctx.db),
hir::PathResolution::SelfType(impl_def) => impl_def.self_ty(ctx.db),
hir::PathResolution::Def(hir::ModuleDef::Adt(hir::Adt::Struct(s))) => {
s.ty(ctx.db)
}
hir::PathResolution::Def(hir::ModuleDef::Adt(hir::Adt::Enum(e))) => {
e.ty(ctx.db)
}
hir::PathResolution::Def(hir::ModuleDef::Adt(hir::Adt::Union(u))) => {
u.ty(ctx.db)
}
hir::PathResolution::Def(hir::ModuleDef::BuiltinType(ty)) => ty.ty(ctx.db),
hir::PathResolution::Def(hir::ModuleDef::TypeAlias(ty)) => ty.ty(ctx.db),
_ => return,
};
if let Some(hir::Adt::Enum(e)) = ty.as_adt() {
acc.add_enum_variants(ctx, path_ctx, e);
}
ctx.iterate_path_candidates(&ty, |item| match item {
AssocItem::TypeAlias(ta) => acc.add_type_alias(ctx, ta),
AssocItem::Const(c) => acc.add_const(ctx, c),
_ => {}
});
}
}
}
Qualified::Absolute => acc.add_crate_roots(ctx, path_ctx),
Qualified::No => {
// this will only be hit if there are brackets or braces, otherwise this will be parsed as an ident pattern
ctx.process_all_names(&mut |name, res| {
// FIXME: we should check what kind of pattern we are in and filter accordingly
let add_completion = match res {
ScopeDef::ModuleDef(hir::ModuleDef::Macro(mac)) => mac.is_fn_like(ctx.db),
ScopeDef::ModuleDef(hir::ModuleDef::Adt(_)) => true,
ScopeDef::ModuleDef(hir::ModuleDef::Variant(_)) => true,
ScopeDef::ModuleDef(hir::ModuleDef::Module(_)) => true,
ScopeDef::ImplSelfType(_) => true,
_ => false,
};
if add_completion {
acc.add_path_resolution(ctx, path_ctx, name, res);
}
});
acc.add_nameref_keywords_with_colon(ctx);
}
Qualified::TypeAnchor { .. } | Qualified::With { .. } => {}
}
}
|
