crates/hir/src/source_analyzer.rs

   1 //! Lookup hir elements using positions in the source code. This is a lossy
   2 //! transformation: in general, a single source might correspond to several
   3 //! modules, functions, etc, due to macros, cfgs and `#[path=]` attributes on
   4 //! modules.
   5 //!
   6 //! So, this modules should not be used during hir construction, it exists
   7 //! purely for "IDE needs".
   8 use std::{iter::once, sync::Arc};
   9
  10 use hir_def::{
  11     body::{
  12         self,
  13         scope::{ExprScopes, ScopeId},
  14         Body, BodySourceMap,
  15     },
  16     expr::{ExprId, Pat, PatId},
  17     path::{ModPath, Path, PathKind},
  18     resolver::{resolver_for_scope, Resolver, TypeNs, ValueNs},
  19     AsMacroCall, DefWithBodyId, FieldId, FunctionId, LocalFieldId, VariantId,
  20 };
  21 use hir_expand::{hygiene::Hygiene, name::AsName, HirFileId, InFile};
  22 use hir_ty::{
  23     diagnostics::{record_literal_missing_fields, record_pattern_missing_fields},
  24     InferenceResult, Interner, Substitution, TyExt, TyLoweringContext,
  25 };
  26 use syntax::{
  27     ast::{self, AstNode},
  28     SyntaxNode, TextRange, TextSize,
  29 };
  30
  31 use crate::{
  32     db::HirDatabase, semantics::PathResolution, Adt, BuiltinType, Const, Field, Function, Local,
  33     MacroDef, ModuleDef, Static, Struct, Trait, Type, TypeAlias, TypeParam, Variant,
  34 };
  35 use base_db::CrateId;
  36
  37 /// `SourceAnalyzer` is a convenience wrapper which exposes HIR API in terms of
  38 /// original source files. It should not be used inside the HIR itself.
  39 #[derive(Debug)]
  40 pub(crate) struct SourceAnalyzer {
  41     pub(crate) file_id: HirFileId,
  42     pub(crate) resolver: Resolver,
  43     body: Option<Arc<Body>>,
  44     body_source_map: Option<Arc<BodySourceMap>>,
  45     infer: Option<Arc<InferenceResult>>,
  46     scopes: Option<Arc<ExprScopes>>,
  47 }
  48
  49 impl SourceAnalyzer {
  50     pub(crate) fn new_for_body(
  51         db: &dyn HirDatabase,
  52         def: DefWithBodyId,
  53         node: InFile<&SyntaxNode>,
  54         offset: Option<TextSize>,
  55     ) -> SourceAnalyzer {
  56         let (body, source_map) = db.body_with_source_map(def);
  57         let scopes = db.expr_scopes(def);
  58         let scope = match offset {
  59             None => scope_for(&scopes, &source_map, node),
  60             Some(offset) => scope_for_offset(db, &scopes, &source_map, node.with_value(offset)),
  61         };
  62         let resolver = resolver_for_scope(db.upcast(), def, scope);
  63         SourceAnalyzer {
  64             resolver,
  65             body: Some(body),
  66             body_source_map: Some(source_map),
  67             infer: Some(db.infer(def)),
  68             scopes: Some(scopes),
  69             file_id: node.file_id,
  70         }
  71     }
  72
  73     pub(crate) fn new_for_resolver(
  74         resolver: Resolver,
  75         node: InFile<&SyntaxNode>,
  76     ) -> SourceAnalyzer {
  77         SourceAnalyzer {
  78             resolver,
  79             body: None,
  80             body_source_map: None,
  81             infer: None,
  82             scopes: None,
  83             file_id: node.file_id,
  84         }
  85     }
  86
  87     fn expr_id(&self, db: &dyn HirDatabase, expr: &ast::Expr) -> Option<ExprId> {
  88         let src = match expr {
  89             ast::Expr::MacroCall(call) => {
  90                 self.expand_expr(db, InFile::new(self.file_id, call.clone()))?
  91             }
  92             _ => InFile::new(self.file_id, expr.clone()),
  93         };
  94         let sm = self.body_source_map.as_ref()?;
  95         sm.node_expr(src.as_ref())
  96     }
  97
  98     fn pat_id(&self, pat: &ast::Pat) -> Option<PatId> {
  99         // FIXME: macros, see `expr_id`
 100         let src = InFile { file_id: self.file_id, value: pat };
 101         self.body_source_map.as_ref()?.node_pat(src)
 102     }
 103
 104     fn expand_expr(
 105         &self,
 106         db: &dyn HirDatabase,
 107         expr: InFile<ast::MacroCall>,
 108     ) -> Option<InFile<ast::Expr>> {
 109         let macro_file = self.body_source_map.as_ref()?.node_macro_file(expr.as_ref())?;
 110         let expanded = db.parse_or_expand(macro_file)?;
 111
 112         let res = match ast::MacroCall::cast(expanded.clone()) {
 113             Some(call) => self.expand_expr(db, InFile::new(macro_file, call))?,
 114             _ => InFile::new(macro_file, ast::Expr::cast(expanded)?),
 115         };
 116         Some(res)
 117     }
 118
 119     pub(crate) fn type_of_expr(
 120         &self,
 121         db: &dyn HirDatabase,
 122         expr: &ast::Expr,
 123     ) -> Option<(Type, Option<Type>)> {
 124         let expr_id = self.expr_id(db, expr)?;
 125         let infer = self.infer.as_ref()?;
 126         let coerced = infer
 127             .expr_adjustments
 128             .get(&expr_id)
 129             .and_then(|adjusts| adjusts.last().map(|adjust| adjust.target.clone()));
 130         let ty = infer[expr_id].clone();
 131         let mk_ty = |ty| Type::new_with_resolver(db, &self.resolver, ty);
 132         mk_ty(ty).zip(Some(coerced.and_then(mk_ty)))
 133     }
 134
 135     pub(crate) fn type_of_pat(
 136         &self,
 137         db: &dyn HirDatabase,
 138         pat: &ast::Pat,
 139     ) -> Option<(Type, Option<Type>)> {
 140         let pat_id = self.pat_id(pat)?;
 141         let infer = self.infer.as_ref()?;
 142         let coerced = infer
 143             .pat_adjustments
 144             .get(&pat_id)
 145             .and_then(|adjusts| adjusts.last().map(|adjust| adjust.target.clone()));
 146         let ty = infer[pat_id].clone();
 147         let mk_ty = |ty| Type::new_with_resolver(db, &self.resolver, ty);
 148         mk_ty(ty).zip(Some(coerced.and_then(mk_ty)))
 149     }
 150
 151     pub(crate) fn type_of_self(
 152         &self,
 153         db: &dyn HirDatabase,
 154         param: &ast::SelfParam,
 155     ) -> Option<Type> {
 156         let src = InFile { file_id: self.file_id, value: param };
 157         let pat_id = self.body_source_map.as_ref()?.node_self_param(src)?;
 158         let ty = self.infer.as_ref()?[pat_id].clone();
 159         Type::new_with_resolver(db, &self.resolver, ty)
 160     }
 161
 162     pub(crate) fn resolve_method_call(
 163         &self,
 164         db: &dyn HirDatabase,
 165         call: &ast::MethodCallExpr,
 166     ) -> Option<(FunctionId, Substitution)> {
 167         let expr_id = self.expr_id(db, &call.clone().into())?;
 168         self.infer.as_ref()?.method_resolution(expr_id)
 169     }
 170
 171     pub(crate) fn resolve_field(
 172         &self,
 173         db: &dyn HirDatabase,
 174         field: &ast::FieldExpr,
 175     ) -> Option<Field> {
 176         let expr_id = self.expr_id(db, &field.clone().into())?;
 177         self.infer.as_ref()?.field_resolution(expr_id).map(|it| it.into())
 178     }
 179
 180     pub(crate) fn resolve_record_field(
 181         &self,
 182         db: &dyn HirDatabase,
 183         field: &ast::RecordExprField,
 184     ) -> Option<(Field, Option<Local>, Type)> {
 185         let record_expr = ast::RecordExpr::cast(field.syntax().parent().and_then(|p| p.parent())?)?;
 186         let expr = ast::Expr::from(record_expr);
 187         let expr_id = self.body_source_map.as_ref()?.node_expr(InFile::new(self.file_id, &expr))?;
 188
 189         let local_name = field.field_name()?.as_name();
 190         let local = if field.name_ref().is_some() {
 191             None
 192         } else {
 193             let path = ModPath::from_segments(PathKind::Plain, once(local_name.clone()));
 194             match self.resolver.resolve_path_in_value_ns_fully(db.upcast(), &path) {
 195                 Some(ValueNs::LocalBinding(pat_id)) => {
 196                     Some(Local { pat_id, parent: self.resolver.body_owner()? })
 197                 }
 198                 _ => None,
 199             }
 200         };
 201         let (_, subst) = self.infer.as_ref()?.type_of_expr.get(expr_id)?.as_adt()?;
 202         let variant = self.infer.as_ref()?.variant_resolution_for_expr(expr_id)?;
 203         let variant_data = variant.variant_data(db.upcast());
 204         let field = FieldId { parent: variant, local_id: variant_data.field(&local_name)? };
 205         let field_ty =
 206             db.field_types(variant).get(field.local_id)?.clone().substitute(&Interner, subst);
 207         Some((field.into(), local, Type::new_with_resolver(db, &self.resolver, field_ty)?))
 208     }
 209
 210     pub(crate) fn resolve_record_pat_field(
 211         &self,
 212         db: &dyn HirDatabase,
 213         field: &ast::RecordPatField,
 214     ) -> Option<Field> {
 215         let field_name = field.field_name()?.as_name();
 216         let record_pat = ast::RecordPat::cast(field.syntax().parent().and_then(|p| p.parent())?)?;
 217         let pat_id = self.pat_id(&record_pat.into())?;
 218         let variant = self.infer.as_ref()?.variant_resolution_for_pat(pat_id)?;
 219         let variant_data = variant.variant_data(db.upcast());
 220         let field = FieldId { parent: variant, local_id: variant_data.field(&field_name)? };
 221         Some(field.into())
 222     }
 223
 224     pub(crate) fn resolve_macro_call(
 225         &self,
 226         db: &dyn HirDatabase,
 227         macro_call: InFile<&ast::MacroCall>,
 228     ) -> Option<MacroDef> {
 229         let ctx = body::LowerCtx::new(db.upcast(), macro_call.file_id);
 230         let path = macro_call.value.path().and_then(|ast| Path::from_src(ast, &ctx))?;
 231         self.resolver.resolve_path_as_macro(db.upcast(), path.mod_path()).map(|it| it.into())
 232     }
 233
 234     pub(crate) fn resolve_bind_pat_to_const(
 235         &self,
 236         db: &dyn HirDatabase,
 237         pat: &ast::IdentPat,
 238     ) -> Option<ModuleDef> {
 239         let pat_id = self.pat_id(&pat.clone().into())?;
 240         let body = self.body.as_ref()?;
 241         let path = match &body[pat_id] {
 242             Pat::Path(path) => path,
 243             _ => return None,
 244         };
 245         let res = resolve_hir_path(db, &self.resolver, path)?;
 246         match res {
 247             PathResolution::Def(def) => Some(def),
 248             _ => None,
 249         }
 250     }
 251
 252     pub(crate) fn resolve_path(
 253         &self,
 254         db: &dyn HirDatabase,
 255         path: &ast::Path,
 256     ) -> Option<PathResolution> {
 257         let parent = || path.syntax().parent();
 258         let mut prefer_value_ns = false;
 259         if let Some(path_expr) = parent().and_then(ast::PathExpr::cast) {
 260             let expr_id = self.expr_id(db, &path_expr.into())?;
 261             let infer = self.infer.as_ref()?;
 262             if let Some(assoc) = infer.assoc_resolutions_for_expr(expr_id) {
 263                 return Some(PathResolution::AssocItem(assoc.into()));
 264             }
 265             if let Some(VariantId::EnumVariantId(variant)) =
 266                 infer.variant_resolution_for_expr(expr_id)
 267             {
 268                 return Some(PathResolution::Def(ModuleDef::Variant(variant.into())));
 269             }
 270             prefer_value_ns = true;
 271         }
 272
 273         if let Some(path_pat) = parent().and_then(ast::PathPat::cast) {
 274             let pat_id = self.pat_id(&path_pat.into())?;
 275             if let Some(assoc) = self.infer.as_ref()?.assoc_resolutions_for_pat(pat_id) {
 276                 return Some(PathResolution::AssocItem(assoc.into()));
 277             }
 278             if let Some(VariantId::EnumVariantId(variant)) =
 279                 self.infer.as_ref()?.variant_resolution_for_pat(pat_id)
 280             {
 281                 return Some(PathResolution::Def(ModuleDef::Variant(variant.into())));
 282             }
 283         }
 284
 285         if let Some(rec_lit) = parent().and_then(ast::RecordExpr::cast) {
 286             let expr_id = self.expr_id(db, &rec_lit.into())?;
 287             if let Some(VariantId::EnumVariantId(variant)) =
 288                 self.infer.as_ref()?.variant_resolution_for_expr(expr_id)
 289             {
 290                 return Some(PathResolution::Def(ModuleDef::Variant(variant.into())));
 291             }
 292         }
 293
 294         if let Some(pat) = parent()
 295             .and_then(ast::RecordPat::cast)
 296             .map(ast::Pat::from)
 297             .or_else(|| parent().and_then(ast::TupleStructPat::cast).map(ast::Pat::from))
 298         {
 299             let pat_id = self.pat_id(&pat)?;
 300             if let Some(VariantId::EnumVariantId(variant)) =
 301                 self.infer.as_ref()?.variant_resolution_for_pat(pat_id)
 302             {
 303                 return Some(PathResolution::Def(ModuleDef::Variant(variant.into())));
 304             }
 305         }
 306
 307         // This must be a normal source file rather than macro file.
 308         let hygiene = Hygiene::new(db.upcast(), self.file_id);
 309         let ctx = body::LowerCtx::with_hygiene(db.upcast(), &hygiene);
 310         let hir_path = Path::from_src(path.clone(), &ctx)?;
 311
 312         // Case where path is a qualifier of another path, e.g. foo::bar::Baz where we are
 313         // trying to resolve foo::bar.
 314         if let Some(outer_path) = parent().and_then(ast::Path::cast) {
 315             if let Some(qualifier) = outer_path.qualifier() {
 316                 if path == &qualifier {
 317                     return resolve_hir_path_qualifier(db, &self.resolver, &hir_path);
 318                 }
 319             }
 320         }
 321         // Case where path is a qualifier of a use tree, e.g. foo::bar::{Baz, Qux} where we are
 322         // trying to resolve foo::bar.
 323         if let Some(use_tree) = parent().and_then(ast::UseTree::cast) {
 324             if let Some(qualifier) = use_tree.path() {
 325                 if path == &qualifier && use_tree.coloncolon_token().is_some() {
 326                     return resolve_hir_path_qualifier(db, &self.resolver, &hir_path);
 327                 }
 328             }
 329         }
 330
 331         if parent().map_or(false, |it| ast::Visibility::can_cast(it.kind())) {
 332             resolve_hir_path_qualifier(db, &self.resolver, &hir_path)
 333         } else {
 334             resolve_hir_path_(db, &self.resolver, &hir_path, prefer_value_ns)
 335         }
 336     }
 337
 338     pub(crate) fn record_literal_missing_fields(
 339         &self,
 340         db: &dyn HirDatabase,
 341         literal: &ast::RecordExpr,
 342     ) -> Option<Vec<(Field, Type)>> {
 343         let krate = self.resolver.krate()?;
 344         let body = self.body.as_ref()?;
 345         let infer = self.infer.as_ref()?;
 346
 347         let expr_id = self.expr_id(db, &literal.clone().into())?;
 348         let substs = infer.type_of_expr[expr_id].as_adt()?.1;
 349
 350         let (variant, missing_fields, _exhaustive) =
 351             record_literal_missing_fields(db, infer, expr_id, &body[expr_id])?;
 352         let res = self.missing_fields(db, krate, substs, variant, missing_fields);
 353         Some(res)
 354     }
 355
 356     pub(crate) fn record_pattern_missing_fields(
 357         &self,
 358         db: &dyn HirDatabase,
 359         pattern: &ast::RecordPat,
 360     ) -> Option<Vec<(Field, Type)>> {
 361         let krate = self.resolver.krate()?;
 362         let body = self.body.as_ref()?;
 363         let infer = self.infer.as_ref()?;
 364
 365         let pat_id = self.pat_id(&pattern.clone().into())?;
 366         let substs = infer.type_of_pat[pat_id].as_adt()?.1;
 367
 368         let (variant, missing_fields, _exhaustive) =
 369             record_pattern_missing_fields(db, infer, pat_id, &body[pat_id])?;
 370         let res = self.missing_fields(db, krate, substs, variant, missing_fields);
 371         Some(res)
 372     }
 373
 374     fn missing_fields(
 375         &self,
 376         db: &dyn HirDatabase,
 377         krate: CrateId,
 378         substs: &Substitution,
 379         variant: VariantId,
 380         missing_fields: Vec<LocalFieldId>,
 381     ) -> Vec<(Field, Type)> {
 382         let field_types = db.field_types(variant);
 383
 384         missing_fields
 385             .into_iter()
 386             .map(|local_id| {
 387                 let field = FieldId { parent: variant, local_id };
 388                 let ty = field_types[local_id].clone().substitute(&Interner, substs);
 389                 (field.into(), Type::new_with_resolver_inner(db, krate, &self.resolver, ty))
 390             })
 391             .collect()
 392     }
 393
 394     pub(crate) fn expand(
 395         &self,
 396         db: &dyn HirDatabase,
 397         macro_call: InFile<&ast::MacroCall>,
 398     ) -> Option<HirFileId> {
 399         let krate = self.resolver.krate()?;
 400         let macro_call_id = macro_call.as_call_id(db.upcast(), krate, |path| {
 401             self.resolver.resolve_path_as_macro(db.upcast(), &path)
 402         })?;
 403         Some(macro_call_id.as_file()).filter(|it| it.expansion_level(db.upcast()) < 64)
 404     }
 405
 406     pub(crate) fn resolve_variant(
 407         &self,
 408         db: &dyn HirDatabase,
 409         record_lit: ast::RecordExpr,
 410     ) -> Option<VariantId> {
 411         let infer = self.infer.as_ref()?;
 412         let expr_id = self.expr_id(db, &record_lit.into())?;
 413         infer.variant_resolution_for_expr(expr_id)
 414     }
 415 }
 416
 417 fn scope_for(
 418     scopes: &ExprScopes,
 419     source_map: &BodySourceMap,
 420     node: InFile<&SyntaxNode>,
 421 ) -> Option<ScopeId> {
 422     node.value
 423         .ancestors()
 424         .filter_map(ast::Expr::cast)
 425         .filter_map(|it| source_map.node_expr(InFile::new(node.file_id, &it)))
 426         .find_map(|it| scopes.scope_for(it))
 427 }
 428
 429 fn scope_for_offset(
 430     db: &dyn HirDatabase,
 431     scopes: &ExprScopes,
 432     source_map: &BodySourceMap,
 433     offset: InFile<TextSize>,
 434 ) -> Option<ScopeId> {
 435     scopes
 436         .scope_by_expr()
 437         .iter()
 438         .filter_map(|(id, scope)| {
 439             let source = source_map.expr_syntax(*id).ok()?;
 440             // FIXME: correctly handle macro expansion
 441             if source.file_id != offset.file_id {
 442                 return None;
 443             }
 444             let root = source.file_syntax(db.upcast());
 445             let node = source.value.to_node(&root);
 446             Some((node.syntax().text_range(), scope))
 447         })
 448         // find containing scope
 449         .min_by_key(|(expr_range, _scope)| {
 450             (
 451                 !(expr_range.start() <= offset.value && offset.value <= expr_range.end()),
 452                 expr_range.len(),
 453             )
 454         })
 455         .map(|(expr_range, scope)| {
 456             adjust(db, scopes, source_map, expr_range, offset).unwrap_or(*scope)
 457         })
 458 }
 459
 460 // XXX: during completion, cursor might be outside of any particular
 461 // expression. Try to figure out the correct scope...
 462 fn adjust(
 463     db: &dyn HirDatabase,
 464     scopes: &ExprScopes,
 465     source_map: &BodySourceMap,
 466     expr_range: TextRange,
 467     offset: InFile<TextSize>,
 468 ) -> Option<ScopeId> {
 469     let child_scopes = scopes
 470         .scope_by_expr()
 471         .iter()
 472         .filter_map(|(id, scope)| {
 473             let source = source_map.expr_syntax(*id).ok()?;
 474             // FIXME: correctly handle macro expansion
 475             if source.file_id != offset.file_id {
 476                 return None;
 477             }
 478             let root = source.file_syntax(db.upcast());
 479             let node = source.value.to_node(&root);
 480             Some((node.syntax().text_range(), scope))
 481         })
 482         .filter(|&(range, _)| {
 483             range.start() <= offset.value && expr_range.contains_range(range) && range != expr_range
 484         });
 485
 486     child_scopes
 487         .max_by(|&(r1, _), &(r2, _)| {
 488             if r1.contains_range(r2) {
 489                 std::cmp::Ordering::Greater
 490             } else if r2.contains_range(r1) {
 491                 std::cmp::Ordering::Less
 492             } else {
 493                 r1.start().cmp(&r2.start())
 494             }
 495         })
 496         .map(|(_ptr, scope)| *scope)
 497 }
 498
 499 #[inline]
 500 pub(crate) fn resolve_hir_path(
 501     db: &dyn HirDatabase,
 502     resolver: &Resolver,
 503     path: &Path,
 504 ) -> Option<PathResolution> {
 505     resolve_hir_path_(db, resolver, path, false)
 506 }
 507
 508 fn resolve_hir_path_(
 509     db: &dyn HirDatabase,
 510     resolver: &Resolver,
 511     path: &Path,
 512     prefer_value_ns: bool,
 513 ) -> Option<PathResolution> {
 514     let types = || {
 515         let (ty, unresolved) = match path.type_anchor() {
 516             Some(type_ref) => {
 517                 let (_, res) = TyLoweringContext::new(db, resolver).lower_ty_ext(type_ref);
 518                 res.map(|ty_ns| (ty_ns, path.segments().first()))
 519             }
 520             None => {
 521                 let (ty, remaining) =
 522                     resolver.resolve_path_in_type_ns(db.upcast(), path.mod_path())?;
 523                 match remaining {
 524                     Some(remaining) if remaining > 1 => None,
 525                     _ => Some((ty, path.segments().get(1))),
 526                 }
 527             }
 528         }?;
 529         let res = match ty {
 530             TypeNs::SelfType(it) => PathResolution::SelfType(it.into()),
 531             TypeNs::GenericParam(id) => PathResolution::TypeParam(TypeParam { id }),
 532             TypeNs::AdtSelfType(it) | TypeNs::AdtId(it) => {
 533                 PathResolution::Def(Adt::from(it).into())
 534             }
 535             TypeNs::EnumVariantId(it) => PathResolution::Def(Variant::from(it).into()),
 536             TypeNs::TypeAliasId(it) => PathResolution::Def(TypeAlias::from(it).into()),
 537             TypeNs::BuiltinType(it) => PathResolution::Def(BuiltinType::from(it).into()),
 538             TypeNs::TraitId(it) => PathResolution::Def(Trait::from(it).into()),
 539         };
 540         match unresolved {
 541             Some(unresolved) => res
 542                 .assoc_type_shorthand_candidates(db, |name, alias| {
 543                     (name == unresolved.name).then(|| alias)
 544                 })
 545                 .map(TypeAlias::from)
 546                 .map(Into::into)
 547                 .map(PathResolution::Def),
 548             None => Some(res),
 549         }
 550     };
 551
 552     let body_owner = resolver.body_owner();
 553     let values = || {
 554         resolver.resolve_path_in_value_ns_fully(db.upcast(), path.mod_path()).and_then(|val| {
 555             let res = match val {
 556                 ValueNs::LocalBinding(pat_id) => {
 557                     let var = Local { parent: body_owner?, pat_id };
 558                     PathResolution::Local(var)
 559                 }
 560                 ValueNs::FunctionId(it) => PathResolution::Def(Function::from(it).into()),
 561                 ValueNs::ConstId(it) => PathResolution::Def(Const::from(it).into()),
 562                 ValueNs::StaticId(it) => PathResolution::Def(Static::from(it).into()),
 563                 ValueNs::StructId(it) => PathResolution::Def(Struct::from(it).into()),
 564                 ValueNs::EnumVariantId(it) => PathResolution::Def(Variant::from(it).into()),
 565                 ValueNs::ImplSelf(impl_id) => PathResolution::SelfType(impl_id.into()),
 566                 ValueNs::GenericParam(it) => PathResolution::ConstParam(it.into()),
 567             };
 568             Some(res)
 569         })
 570     };
 571
 572     let items = || {
 573         resolver
 574             .resolve_module_path_in_items(db.upcast(), path.mod_path())
 575             .take_types()
 576             .map(|it| PathResolution::Def(it.into()))
 577     };
 578
 579     let macros = || {
 580         resolver
 581             .resolve_path_as_macro(db.upcast(), path.mod_path())
 582             .map(|def| PathResolution::Macro(def.into()))
 583     };
 584
 585     if prefer_value_ns { values().or_else(types) } else { types().or_else(values) }
 586         .or_else(items)
 587         .or_else(macros)
 588 }
 589
 590 /// Resolves a path where we know it is a qualifier of another path.
 591 ///
 592 /// For example, if we have:
 593 /// ```
 594 /// mod my {
 595 ///     pub mod foo {
 596 ///         struct Bar;
 597 ///     }
 598 ///
 599 ///     pub fn foo() {}
 600 /// }
 601 /// ```
 602 /// then we know that `foo` in `my::foo::Bar` refers to the module, not the function.
 603 fn resolve_hir_path_qualifier(
 604     db: &dyn HirDatabase,
 605     resolver: &Resolver,
 606     path: &Path,
 607 ) -> Option<PathResolution> {
 608     let items = resolver
 609         .resolve_module_path_in_items(db.upcast(), path.mod_path())
 610         .take_types()
 611         .map(|it| PathResolution::Def(it.into()));
 612
 613     if items.is_some() {
 614         return items;
 615     }
 616
 617     resolver.resolve_path_in_type_ns_fully(db.upcast(), path.mod_path()).map(|ty| match ty {
 618         TypeNs::SelfType(it) => PathResolution::SelfType(it.into()),
 619         TypeNs::GenericParam(id) => PathResolution::TypeParam(TypeParam { id }),
 620         TypeNs::AdtSelfType(it) | TypeNs::AdtId(it) => PathResolution::Def(Adt::from(it).into()),
 621         TypeNs::EnumVariantId(it) => PathResolution::Def(Variant::from(it).into()),
 622         TypeNs::TypeAliasId(it) => PathResolution::Def(TypeAlias::from(it).into()),
 623         TypeNs::BuiltinType(it) => PathResolution::Def(BuiltinType::from(it).into()),
 624         TypeNs::TraitId(it) => PathResolution::Def(Trait::from(it).into()),
 625     })
 626 }