| //! Lookup hir elements using positions in the source code. This is a lossy |
| //! transformation: in general, a single source might correspond to several |
| //! modules, functions, etc, due to macros, cfgs and `#[path=]` attributes on |
| //! modules. |
| //! |
| //! So, this modules should not be used during hir construction, it exists |
| //! purely for "IDE needs". |
| use std::iter::{self, once}; |
| |
| use either::Either; |
| use hir_def::{ |
| body::{ |
| scope::{ExprScopes, ScopeId}, |
| Body, BodySourceMap, |
| }, |
| hir::{BindingId, ExprId, ExprOrPatId, Pat, PatId}, |
| lang_item::LangItem, |
| lower::LowerCtx, |
| nameres::MacroSubNs, |
| path::{ModPath, Path, PathKind}, |
| resolver::{resolver_for_scope, Resolver, TypeNs, ValueNs}, |
| type_ref::Mutability, |
| AsMacroCall, AssocItemId, ConstId, DefWithBodyId, FieldId, FunctionId, ItemContainerId, |
| LocalFieldId, Lookup, ModuleDefId, TraitId, VariantId, |
| }; |
| use hir_expand::{ |
| mod_path::path, |
| name::{AsName, Name}, |
| HirFileId, InFile, InMacroFile, MacroFileId, MacroFileIdExt, |
| }; |
| use hir_ty::{ |
| diagnostics::{ |
| record_literal_missing_fields, record_pattern_missing_fields, unsafe_expressions, |
| UnsafeExpr, |
| }, |
| lang_items::lang_items_for_bin_op, |
| method_resolution, Adjustment, InferenceResult, Interner, Substitution, Ty, TyExt, TyKind, |
| TyLoweringContext, |
| }; |
| use intern::sym; |
| use itertools::Itertools; |
| use smallvec::SmallVec; |
| use syntax::{ |
| ast::{self, AstNode}, |
| SyntaxKind, SyntaxNode, TextRange, TextSize, |
| }; |
| use triomphe::Arc; |
| |
| use crate::{ |
| db::HirDatabase, semantics::PathResolution, Adt, AssocItem, BindingMode, BuiltinAttr, |
| BuiltinType, Callable, Const, DeriveHelper, Field, Function, Local, Macro, ModuleDef, Static, |
| Struct, ToolModule, Trait, TraitAlias, TupleField, Type, TypeAlias, Variant, |
| }; |
| |
| /// `SourceAnalyzer` is a convenience wrapper which exposes HIR API in terms of |
| /// original source files. It should not be used inside the HIR itself. |
| #[derive(Debug)] |
| pub(crate) struct SourceAnalyzer { |
| pub(crate) file_id: HirFileId, |
| pub(crate) resolver: Resolver, |
| def: Option<(DefWithBodyId, Arc<Body>, Arc<BodySourceMap>)>, |
| infer: Option<Arc<InferenceResult>>, |
| } |
| |
| impl SourceAnalyzer { |
| pub(crate) fn new_for_body( |
| db: &dyn HirDatabase, |
| def: DefWithBodyId, |
| node: InFile<&SyntaxNode>, |
| offset: Option<TextSize>, |
| ) -> SourceAnalyzer { |
| Self::new_for_body_(db, def, node, offset, Some(db.infer(def))) |
| } |
| |
| pub(crate) fn new_for_body_no_infer( |
| db: &dyn HirDatabase, |
| def: DefWithBodyId, |
| node: InFile<&SyntaxNode>, |
| offset: Option<TextSize>, |
| ) -> SourceAnalyzer { |
| Self::new_for_body_(db, def, node, offset, None) |
| } |
| |
| pub(crate) fn new_for_body_( |
| db: &dyn HirDatabase, |
| def: DefWithBodyId, |
| node @ InFile { file_id, .. }: InFile<&SyntaxNode>, |
| offset: Option<TextSize>, |
| infer: Option<Arc<InferenceResult>>, |
| ) -> SourceAnalyzer { |
| let (body, source_map) = db.body_with_source_map(def); |
| let scopes = db.expr_scopes(def); |
| let scope = match offset { |
| None => scope_for(db, &scopes, &source_map, node), |
| Some(offset) => { |
| debug_assert!( |
| node.text_range().contains_inclusive(offset), |
| "{:?} not in {:?}", |
| offset, |
| node.text_range() |
| ); |
| scope_for_offset(db, &scopes, &source_map, node.file_id, offset) |
| } |
| }; |
| let resolver = resolver_for_scope(db.upcast(), def, scope); |
| SourceAnalyzer { resolver, def: Some((def, body, source_map)), infer, file_id } |
| } |
| |
| pub(crate) fn new_for_resolver( |
| resolver: Resolver, |
| node: InFile<&SyntaxNode>, |
| ) -> SourceAnalyzer { |
| SourceAnalyzer { resolver, def: None, infer: None, file_id: node.file_id } |
| } |
| |
| fn body_source_map(&self) -> Option<&BodySourceMap> { |
| self.def.as_ref().map(|(.., source_map)| &**source_map) |
| } |
| fn body(&self) -> Option<&Body> { |
| self.def.as_ref().map(|(_, body, _)| &**body) |
| } |
| |
| fn expr_id(&self, db: &dyn HirDatabase, expr: &ast::Expr) -> Option<ExprOrPatId> { |
| let src = match expr { |
| ast::Expr::MacroExpr(expr) => { |
| self.expand_expr(db, InFile::new(self.file_id, expr.macro_call()?))?.into() |
| } |
| _ => InFile::new(self.file_id, expr.clone()), |
| }; |
| let sm = self.body_source_map()?; |
| sm.node_expr(src.as_ref()) |
| } |
| |
| fn pat_id(&self, pat: &ast::Pat) -> Option<PatId> { |
| // FIXME: macros, see `expr_id` |
| let src = InFile { file_id: self.file_id, value: pat }; |
| self.body_source_map()?.node_pat(src) |
| } |
| |
| fn binding_id_of_pat(&self, pat: &ast::IdentPat) -> Option<BindingId> { |
| let pat_id = self.pat_id(&pat.clone().into())?; |
| if let Pat::Bind { id, .. } = self.body()?.pats[pat_id] { |
| Some(id) |
| } else { |
| None |
| } |
| } |
| |
| fn expand_expr( |
| &self, |
| db: &dyn HirDatabase, |
| expr: InFile<ast::MacroCall>, |
| ) -> Option<InMacroFile<ast::Expr>> { |
| let macro_file = self.body_source_map()?.node_macro_file(expr.as_ref())?; |
| let expanded = db.parse_macro_expansion(macro_file).value.0.syntax_node(); |
| let res = if let Some(stmts) = ast::MacroStmts::cast(expanded.clone()) { |
| match stmts.expr()? { |
| ast::Expr::MacroExpr(mac) => { |
| self.expand_expr(db, InFile::new(macro_file.into(), mac.macro_call()?))? |
| } |
| expr => InMacroFile::new(macro_file, expr), |
| } |
| } else if let Some(call) = ast::MacroCall::cast(expanded.clone()) { |
| self.expand_expr(db, InFile::new(macro_file.into(), call))? |
| } else { |
| InMacroFile::new(macro_file, ast::Expr::cast(expanded)?) |
| }; |
| |
| Some(res) |
| } |
| |
| pub(crate) fn expr_adjustments( |
| &self, |
| db: &dyn HirDatabase, |
| expr: &ast::Expr, |
| ) -> Option<&[Adjustment]> { |
| // It is safe to omit destructuring assignments here because they have no adjustments (neither |
| // expressions nor patterns). |
| let expr_id = self.expr_id(db, expr)?.as_expr()?; |
| let infer = self.infer.as_ref()?; |
| infer.expr_adjustments.get(&expr_id).map(|v| &**v) |
| } |
| |
| pub(crate) fn type_of_expr( |
| &self, |
| db: &dyn HirDatabase, |
| expr: &ast::Expr, |
| ) -> Option<(Type, Option<Type>)> { |
| let expr_id = self.expr_id(db, expr)?; |
| let infer = self.infer.as_ref()?; |
| let coerced = expr_id |
| .as_expr() |
| .and_then(|expr_id| infer.expr_adjustments.get(&expr_id)) |
| .and_then(|adjusts| adjusts.last().map(|adjust| adjust.target.clone())); |
| let ty = infer[expr_id].clone(); |
| let mk_ty = |ty| Type::new_with_resolver(db, &self.resolver, ty); |
| Some((mk_ty(ty), coerced.map(mk_ty))) |
| } |
| |
| pub(crate) fn type_of_pat( |
| &self, |
| db: &dyn HirDatabase, |
| pat: &ast::Pat, |
| ) -> Option<(Type, Option<Type>)> { |
| let pat_id = self.pat_id(pat)?; |
| let infer = self.infer.as_ref()?; |
| let coerced = |
| infer.pat_adjustments.get(&pat_id).and_then(|adjusts| adjusts.last().cloned()); |
| let ty = infer[pat_id].clone(); |
| let mk_ty = |ty| Type::new_with_resolver(db, &self.resolver, ty); |
| Some((mk_ty(ty), coerced.map(mk_ty))) |
| } |
| |
| pub(crate) fn type_of_binding_in_pat( |
| &self, |
| db: &dyn HirDatabase, |
| pat: &ast::IdentPat, |
| ) -> Option<Type> { |
| let binding_id = self.binding_id_of_pat(pat)?; |
| let infer = self.infer.as_ref()?; |
| let ty = infer[binding_id].clone(); |
| let mk_ty = |ty| Type::new_with_resolver(db, &self.resolver, ty); |
| Some(mk_ty(ty)) |
| } |
| |
| pub(crate) fn type_of_self( |
| &self, |
| db: &dyn HirDatabase, |
| _param: &ast::SelfParam, |
| ) -> Option<Type> { |
| let binding = self.body()?.self_param?; |
| let ty = self.infer.as_ref()?[binding].clone(); |
| Some(Type::new_with_resolver(db, &self.resolver, ty)) |
| } |
| |
| pub(crate) fn binding_mode_of_pat( |
| &self, |
| _db: &dyn HirDatabase, |
| pat: &ast::IdentPat, |
| ) -> Option<BindingMode> { |
| let id = self.pat_id(&pat.clone().into())?; |
| let infer = self.infer.as_ref()?; |
| infer.binding_modes.get(id).map(|bm| match bm { |
| hir_ty::BindingMode::Move => BindingMode::Move, |
| hir_ty::BindingMode::Ref(hir_ty::Mutability::Mut) => BindingMode::Ref(Mutability::Mut), |
| hir_ty::BindingMode::Ref(hir_ty::Mutability::Not) => { |
| BindingMode::Ref(Mutability::Shared) |
| } |
| }) |
| } |
| pub(crate) fn pattern_adjustments( |
| &self, |
| db: &dyn HirDatabase, |
| pat: &ast::Pat, |
| ) -> Option<SmallVec<[Type; 1]>> { |
| let pat_id = self.pat_id(pat)?; |
| let infer = self.infer.as_ref()?; |
| Some( |
| infer |
| .pat_adjustments |
| .get(&pat_id)? |
| .iter() |
| .map(|ty| Type::new_with_resolver(db, &self.resolver, ty.clone())) |
| .collect(), |
| ) |
| } |
| |
| pub(crate) fn resolve_method_call_as_callable( |
| &self, |
| db: &dyn HirDatabase, |
| call: &ast::MethodCallExpr, |
| ) -> Option<Callable> { |
| let expr_id = self.expr_id(db, &call.clone().into())?.as_expr()?; |
| let (func, substs) = self.infer.as_ref()?.method_resolution(expr_id)?; |
| let ty = db.value_ty(func.into())?.substitute(Interner, &substs); |
| let ty = Type::new_with_resolver(db, &self.resolver, ty); |
| let mut res = ty.as_callable(db)?; |
| res.is_bound_method = true; |
| Some(res) |
| } |
| |
| pub(crate) fn resolve_method_call( |
| &self, |
| db: &dyn HirDatabase, |
| call: &ast::MethodCallExpr, |
| ) -> Option<Function> { |
| let expr_id = self.expr_id(db, &call.clone().into())?.as_expr()?; |
| let (f_in_trait, substs) = self.infer.as_ref()?.method_resolution(expr_id)?; |
| |
| Some(self.resolve_impl_method_or_trait_def(db, f_in_trait, substs).into()) |
| } |
| |
| pub(crate) fn resolve_method_call_fallback( |
| &self, |
| db: &dyn HirDatabase, |
| call: &ast::MethodCallExpr, |
| ) -> Option<Either<Function, Field>> { |
| let expr_id = self.expr_id(db, &call.clone().into())?.as_expr()?; |
| let inference_result = self.infer.as_ref()?; |
| match inference_result.method_resolution(expr_id) { |
| Some((f_in_trait, substs)) => Some(Either::Left( |
| self.resolve_impl_method_or_trait_def(db, f_in_trait, substs).into(), |
| )), |
| None => inference_result |
| .field_resolution(expr_id) |
| .and_then(Either::left) |
| .map(Into::into) |
| .map(Either::Right), |
| } |
| } |
| |
| pub(crate) fn resolve_expr_as_callable( |
| &self, |
| db: &dyn HirDatabase, |
| call: &ast::Expr, |
| ) -> Option<Callable> { |
| let (orig, adjusted) = self.type_of_expr(db, &call.clone())?; |
| adjusted.unwrap_or(orig).as_callable(db) |
| } |
| |
| pub(crate) fn resolve_field( |
| &self, |
| db: &dyn HirDatabase, |
| field: &ast::FieldExpr, |
| ) -> Option<Either<Field, TupleField>> { |
| let &(def, ..) = self.def.as_ref()?; |
| let expr_id = self.expr_id(db, &field.clone().into())?.as_expr()?; |
| self.infer.as_ref()?.field_resolution(expr_id).map(|it| { |
| it.map_either(Into::into, |f| TupleField { owner: def, tuple: f.tuple, index: f.index }) |
| }) |
| } |
| |
| pub(crate) fn resolve_field_fallback( |
| &self, |
| db: &dyn HirDatabase, |
| field: &ast::FieldExpr, |
| ) -> Option<Either<Either<Field, TupleField>, Function>> { |
| let &(def, ..) = self.def.as_ref()?; |
| let expr_id = self.expr_id(db, &field.clone().into())?.as_expr()?; |
| let inference_result = self.infer.as_ref()?; |
| match inference_result.field_resolution(expr_id) { |
| Some(field) => Some(Either::Left(field.map_either(Into::into, |f| TupleField { |
| owner: def, |
| tuple: f.tuple, |
| index: f.index, |
| }))), |
| None => inference_result.method_resolution(expr_id).map(|(f, substs)| { |
| Either::Right(self.resolve_impl_method_or_trait_def(db, f, substs).into()) |
| }), |
| } |
| } |
| |
| pub(crate) fn resolve_await_to_poll( |
| &self, |
| db: &dyn HirDatabase, |
| await_expr: &ast::AwaitExpr, |
| ) -> Option<FunctionId> { |
| let mut ty = self.ty_of_expr(db, &await_expr.expr()?)?.clone(); |
| |
| let into_future_trait = self |
| .resolver |
| .resolve_known_trait(db.upcast(), &path![core::future::IntoFuture]) |
| .map(Trait::from); |
| |
| if let Some(into_future_trait) = into_future_trait { |
| let type_ = Type::new_with_resolver(db, &self.resolver, ty.clone()); |
| if type_.impls_trait(db, into_future_trait, &[]) { |
| let items = into_future_trait.items(db); |
| let into_future_type = items.into_iter().find_map(|item| match item { |
| AssocItem::TypeAlias(alias) |
| if alias.name(db) == Name::new_symbol_root(sym::IntoFuture.clone()) => |
| { |
| Some(alias) |
| } |
| _ => None, |
| })?; |
| let future_trait = type_.normalize_trait_assoc_type(db, &[], into_future_type)?; |
| ty = future_trait.ty; |
| } |
| } |
| |
| let future_trait = db.lang_item(self.resolver.krate(), LangItem::Future)?.as_trait()?; |
| let poll_fn = db.lang_item(self.resolver.krate(), LangItem::FuturePoll)?.as_function()?; |
| // HACK: subst for `poll()` coincides with that for `Future` because `poll()` itself |
| // doesn't have any generic parameters, so we skip building another subst for `poll()`. |
| let substs = hir_ty::TyBuilder::subst_for_def(db, future_trait, None).push(ty).build(); |
| Some(self.resolve_impl_method_or_trait_def(db, poll_fn, substs)) |
| } |
| |
| pub(crate) fn resolve_prefix_expr( |
| &self, |
| db: &dyn HirDatabase, |
| prefix_expr: &ast::PrefixExpr, |
| ) -> Option<FunctionId> { |
| let (op_trait, op_fn) = match prefix_expr.op_kind()? { |
| ast::UnaryOp::Deref => { |
| // This can be either `Deref::deref` or `DerefMut::deref_mut`. |
| // Since deref kind is inferenced and stored in `InferenceResult.method_resolution`, |
| // use that result to find out which one it is. |
| let (deref_trait, deref) = self.lang_trait_fn( |
| db, |
| LangItem::Deref, |
| &Name::new_symbol_root(sym::deref.clone()), |
| )?; |
| self.infer |
| .as_ref() |
| .and_then(|infer| { |
| let expr = self.expr_id(db, &prefix_expr.clone().into())?.as_expr()?; |
| let (func, _) = infer.method_resolution(expr)?; |
| let (deref_mut_trait, deref_mut) = self.lang_trait_fn( |
| db, |
| LangItem::DerefMut, |
| &Name::new_symbol_root(sym::deref_mut.clone()), |
| )?; |
| if func == deref_mut { |
| Some((deref_mut_trait, deref_mut)) |
| } else { |
| None |
| } |
| }) |
| .unwrap_or((deref_trait, deref)) |
| } |
| ast::UnaryOp::Not => { |
| self.lang_trait_fn(db, LangItem::Not, &Name::new_symbol_root(sym::not.clone()))? |
| } |
| ast::UnaryOp::Neg => { |
| self.lang_trait_fn(db, LangItem::Neg, &Name::new_symbol_root(sym::neg.clone()))? |
| } |
| }; |
| |
| let ty = self.ty_of_expr(db, &prefix_expr.expr()?)?; |
| |
| // HACK: subst for all methods coincides with that for their trait because the methods |
| // don't have any generic parameters, so we skip building another subst for the methods. |
| let substs = hir_ty::TyBuilder::subst_for_def(db, op_trait, None).push(ty.clone()).build(); |
| |
| Some(self.resolve_impl_method_or_trait_def(db, op_fn, substs)) |
| } |
| |
| pub(crate) fn resolve_index_expr( |
| &self, |
| db: &dyn HirDatabase, |
| index_expr: &ast::IndexExpr, |
| ) -> Option<FunctionId> { |
| let base_ty = self.ty_of_expr(db, &index_expr.base()?)?; |
| let index_ty = self.ty_of_expr(db, &index_expr.index()?)?; |
| |
| let (index_trait, index_fn) = |
| self.lang_trait_fn(db, LangItem::Index, &Name::new_symbol_root(sym::index.clone()))?; |
| let (op_trait, op_fn) = self |
| .infer |
| .as_ref() |
| .and_then(|infer| { |
| let expr = self.expr_id(db, &index_expr.clone().into())?.as_expr()?; |
| let (func, _) = infer.method_resolution(expr)?; |
| let (index_mut_trait, index_mut_fn) = self.lang_trait_fn( |
| db, |
| LangItem::IndexMut, |
| &Name::new_symbol_root(sym::index_mut.clone()), |
| )?; |
| if func == index_mut_fn { |
| Some((index_mut_trait, index_mut_fn)) |
| } else { |
| None |
| } |
| }) |
| .unwrap_or((index_trait, index_fn)); |
| // HACK: subst for all methods coincides with that for their trait because the methods |
| // don't have any generic parameters, so we skip building another subst for the methods. |
| let substs = hir_ty::TyBuilder::subst_for_def(db, op_trait, None) |
| .push(base_ty.clone()) |
| .push(index_ty.clone()) |
| .build(); |
| Some(self.resolve_impl_method_or_trait_def(db, op_fn, substs)) |
| } |
| |
| pub(crate) fn resolve_bin_expr( |
| &self, |
| db: &dyn HirDatabase, |
| binop_expr: &ast::BinExpr, |
| ) -> Option<FunctionId> { |
| let op = binop_expr.op_kind()?; |
| let lhs = self.ty_of_expr(db, &binop_expr.lhs()?)?; |
| let rhs = self.ty_of_expr(db, &binop_expr.rhs()?)?; |
| |
| let (op_trait, op_fn) = lang_items_for_bin_op(op) |
| .and_then(|(name, lang_item)| self.lang_trait_fn(db, lang_item, &name))?; |
| // HACK: subst for `index()` coincides with that for `Index` because `index()` itself |
| // doesn't have any generic parameters, so we skip building another subst for `index()`. |
| let substs = hir_ty::TyBuilder::subst_for_def(db, op_trait, None) |
| .push(lhs.clone()) |
| .push(rhs.clone()) |
| .build(); |
| |
| Some(self.resolve_impl_method_or_trait_def(db, op_fn, substs)) |
| } |
| |
| pub(crate) fn resolve_try_expr( |
| &self, |
| db: &dyn HirDatabase, |
| try_expr: &ast::TryExpr, |
| ) -> Option<FunctionId> { |
| let ty = self.ty_of_expr(db, &try_expr.expr()?)?; |
| |
| let op_fn = db.lang_item(self.resolver.krate(), LangItem::TryTraitBranch)?.as_function()?; |
| let op_trait = match op_fn.lookup(db.upcast()).container { |
| ItemContainerId::TraitId(id) => id, |
| _ => return None, |
| }; |
| // HACK: subst for `branch()` coincides with that for `Try` because `branch()` itself |
| // doesn't have any generic parameters, so we skip building another subst for `branch()`. |
| let substs = hir_ty::TyBuilder::subst_for_def(db, op_trait, None).push(ty.clone()).build(); |
| |
| Some(self.resolve_impl_method_or_trait_def(db, op_fn, substs)) |
| } |
| |
| pub(crate) fn resolve_record_field( |
| &self, |
| db: &dyn HirDatabase, |
| field: &ast::RecordExprField, |
| ) -> Option<(Field, Option<Local>, Type)> { |
| let record_expr = ast::RecordExpr::cast(field.syntax().parent().and_then(|p| p.parent())?)?; |
| let expr = ast::Expr::from(record_expr); |
| let expr_id = self.body_source_map()?.node_expr(InFile::new(self.file_id, &expr))?; |
| |
| let local_name = field.field_name()?.as_name(); |
| let local = if field.name_ref().is_some() { |
| None |
| } else { |
| // Shorthand syntax, resolve to the local |
| let path = Path::from_known_path_with_no_generic(ModPath::from_segments( |
| PathKind::Plain, |
| once(local_name.clone()), |
| )); |
| match self.resolver.resolve_path_in_value_ns_fully(db.upcast(), &path) { |
| Some(ValueNs::LocalBinding(binding_id)) => { |
| Some(Local { binding_id, parent: self.resolver.body_owner()? }) |
| } |
| _ => None, |
| } |
| }; |
| let (_, subst) = self.infer.as_ref()?.type_of_expr_or_pat(expr_id)?.as_adt()?; |
| let variant = self.infer.as_ref()?.variant_resolution_for_expr_or_pat(expr_id)?; |
| let variant_data = variant.variant_data(db.upcast()); |
| let field = FieldId { parent: variant, local_id: variant_data.field(&local_name)? }; |
| let field_ty = |
| db.field_types(variant).get(field.local_id)?.clone().substitute(Interner, subst); |
| Some((field.into(), local, Type::new_with_resolver(db, &self.resolver, field_ty))) |
| } |
| |
| pub(crate) fn resolve_record_pat_field( |
| &self, |
| db: &dyn HirDatabase, |
| field: &ast::RecordPatField, |
| ) -> Option<(Field, Type)> { |
| let field_name = field.field_name()?.as_name(); |
| let record_pat = ast::RecordPat::cast(field.syntax().parent().and_then(|p| p.parent())?)?; |
| let pat_id = self.pat_id(&record_pat.into())?; |
| let variant = self.infer.as_ref()?.variant_resolution_for_pat(pat_id)?; |
| let variant_data = variant.variant_data(db.upcast()); |
| let field = FieldId { parent: variant, local_id: variant_data.field(&field_name)? }; |
| let (_, subst) = self.infer.as_ref()?.type_of_pat.get(pat_id)?.as_adt()?; |
| let field_ty = |
| db.field_types(variant).get(field.local_id)?.clone().substitute(Interner, subst); |
| Some((field.into(), Type::new_with_resolver(db, &self.resolver, field_ty))) |
| } |
| |
| pub(crate) fn resolve_macro_call( |
| &self, |
| db: &dyn HirDatabase, |
| macro_call: InFile<&ast::MacroCall>, |
| ) -> Option<Macro> { |
| let ctx = LowerCtx::new(db.upcast(), macro_call.file_id); |
| let path = macro_call.value.path().and_then(|ast| Path::from_src(&ctx, ast))?; |
| self.resolver |
| .resolve_path_as_macro(db.upcast(), path.mod_path()?, Some(MacroSubNs::Bang)) |
| .map(|(it, _)| it.into()) |
| } |
| |
| pub(crate) fn resolve_bind_pat_to_const( |
| &self, |
| db: &dyn HirDatabase, |
| pat: &ast::IdentPat, |
| ) -> Option<ModuleDef> { |
| let pat_id = self.pat_id(&pat.clone().into())?; |
| let body = self.body()?; |
| let path = match &body[pat_id] { |
| Pat::Path(path) => path, |
| _ => return None, |
| }; |
| let res = resolve_hir_path(db, &self.resolver, path)?; |
| match res { |
| PathResolution::Def(def) => Some(def), |
| _ => None, |
| } |
| } |
| |
| pub(crate) fn resolve_path( |
| &self, |
| db: &dyn HirDatabase, |
| path: &ast::Path, |
| ) -> Option<PathResolution> { |
| let parent = path.syntax().parent(); |
| let parent = || parent.clone(); |
| |
| let mut prefer_value_ns = false; |
| let resolved = (|| { |
| let infer = self.infer.as_deref()?; |
| if let Some(path_expr) = parent().and_then(ast::PathExpr::cast) { |
| let expr_id = self.expr_id(db, &path_expr.into())?; |
| if let Some((assoc, subs)) = infer.assoc_resolutions_for_expr_or_pat(expr_id) { |
| let assoc = match assoc { |
| AssocItemId::FunctionId(f_in_trait) => { |
| match infer.type_of_expr_or_pat(expr_id) { |
| None => assoc, |
| Some(func_ty) => { |
| if let TyKind::FnDef(_fn_def, subs) = func_ty.kind(Interner) { |
| self.resolve_impl_method_or_trait_def( |
| db, |
| f_in_trait, |
| subs.clone(), |
| ) |
| .into() |
| } else { |
| assoc |
| } |
| } |
| } |
| } |
| AssocItemId::ConstId(const_id) => { |
| self.resolve_impl_const_or_trait_def(db, const_id, subs).into() |
| } |
| assoc => assoc, |
| }; |
| |
| return Some(PathResolution::Def(AssocItem::from(assoc).into())); |
| } |
| if let Some(VariantId::EnumVariantId(variant)) = |
| infer.variant_resolution_for_expr_or_pat(expr_id) |
| { |
| return Some(PathResolution::Def(ModuleDef::Variant(variant.into()))); |
| } |
| prefer_value_ns = true; |
| } else if let Some(path_pat) = parent().and_then(ast::PathPat::cast) { |
| let pat_id = self.pat_id(&path_pat.into())?; |
| if let Some((assoc, subs)) = infer.assoc_resolutions_for_pat(pat_id) { |
| let assoc = match assoc { |
| AssocItemId::ConstId(const_id) => { |
| self.resolve_impl_const_or_trait_def(db, const_id, subs).into() |
| } |
| assoc => assoc, |
| }; |
| return Some(PathResolution::Def(AssocItem::from(assoc).into())); |
| } |
| if let Some(VariantId::EnumVariantId(variant)) = |
| infer.variant_resolution_for_pat(pat_id) |
| { |
| return Some(PathResolution::Def(ModuleDef::Variant(variant.into()))); |
| } |
| } else if let Some(rec_lit) = parent().and_then(ast::RecordExpr::cast) { |
| let expr_id = self.expr_id(db, &rec_lit.into())?; |
| if let Some(VariantId::EnumVariantId(variant)) = |
| infer.variant_resolution_for_expr_or_pat(expr_id) |
| { |
| return Some(PathResolution::Def(ModuleDef::Variant(variant.into()))); |
| } |
| } else { |
| let record_pat = parent().and_then(ast::RecordPat::cast).map(ast::Pat::from); |
| let tuple_struct_pat = |
| || parent().and_then(ast::TupleStructPat::cast).map(ast::Pat::from); |
| if let Some(pat) = record_pat.or_else(tuple_struct_pat) { |
| let pat_id = self.pat_id(&pat)?; |
| let variant_res_for_pat = infer.variant_resolution_for_pat(pat_id); |
| if let Some(VariantId::EnumVariantId(variant)) = variant_res_for_pat { |
| return Some(PathResolution::Def(ModuleDef::Variant(variant.into()))); |
| } |
| } |
| } |
| None |
| })(); |
| if resolved.is_some() { |
| return resolved; |
| } |
| |
| let ctx = LowerCtx::new(db.upcast(), self.file_id); |
| let hir_path = Path::from_src(&ctx, path.clone())?; |
| |
| // Case where path is a qualifier of a use tree, e.g. foo::bar::{Baz, Qux} where we are |
| // trying to resolve foo::bar. |
| if let Some(use_tree) = parent().and_then(ast::UseTree::cast) { |
| if use_tree.coloncolon_token().is_some() { |
| return resolve_hir_path_qualifier(db, &self.resolver, &hir_path); |
| } |
| } |
| |
| let meta_path = path |
| .syntax() |
| .ancestors() |
| .take_while(|it| { |
| let kind = it.kind(); |
| ast::Path::can_cast(kind) || ast::Meta::can_cast(kind) |
| }) |
| .last() |
| .and_then(ast::Meta::cast); |
| |
| // Case where path is a qualifier of another path, e.g. foo::bar::Baz where we are |
| // trying to resolve foo::bar. |
| if path.parent_path().is_some() { |
| return match resolve_hir_path_qualifier(db, &self.resolver, &hir_path) { |
| None if meta_path.is_some() => { |
| path.first_segment().and_then(|it| it.name_ref()).and_then(|name_ref| { |
| ToolModule::by_name(db, self.resolver.krate().into(), &name_ref.text()) |
| .map(PathResolution::ToolModule) |
| }) |
| } |
| res => res, |
| }; |
| } else if let Some(meta_path) = meta_path { |
| // Case where we are resolving the final path segment of a path in an attribute |
| // in this case we have to check for inert/builtin attributes and tools and prioritize |
| // resolution of attributes over other namespaces |
| if let Some(name_ref) = path.as_single_name_ref() { |
| let builtin = |
| BuiltinAttr::by_name(db, self.resolver.krate().into(), &name_ref.text()); |
| if builtin.is_some() { |
| return builtin.map(PathResolution::BuiltinAttr); |
| } |
| |
| if let Some(attr) = meta_path.parent_attr() { |
| let adt = if let Some(field) = |
| attr.syntax().parent().and_then(ast::RecordField::cast) |
| { |
| field.syntax().ancestors().take(4).find_map(ast::Adt::cast) |
| } else if let Some(field) = |
| attr.syntax().parent().and_then(ast::TupleField::cast) |
| { |
| field.syntax().ancestors().take(4).find_map(ast::Adt::cast) |
| } else if let Some(variant) = |
| attr.syntax().parent().and_then(ast::Variant::cast) |
| { |
| variant.syntax().ancestors().nth(2).and_then(ast::Adt::cast) |
| } else { |
| None |
| }; |
| if let Some(adt) = adt { |
| let ast_id = db.ast_id_map(self.file_id).ast_id(&adt); |
| if let Some(helpers) = self |
| .resolver |
| .def_map() |
| .derive_helpers_in_scope(InFile::new(self.file_id, ast_id)) |
| { |
| // FIXME: Multiple derives can have the same helper |
| let name_ref = name_ref.as_name(); |
| for (macro_id, mut helpers) in |
| helpers.iter().group_by(|(_, macro_id, ..)| macro_id).into_iter() |
| { |
| if let Some(idx) = helpers.position(|(name, ..)| *name == name_ref) |
| { |
| return Some(PathResolution::DeriveHelper(DeriveHelper { |
| derive: *macro_id, |
| idx: idx as u32, |
| })); |
| } |
| } |
| } |
| } |
| } |
| } |
| return match resolve_hir_path_as_attr_macro(db, &self.resolver, &hir_path) { |
| Some(m) => Some(PathResolution::Def(ModuleDef::Macro(m))), |
| // this labels any path that starts with a tool module as the tool itself, this is technically wrong |
| // but there is no benefit in differentiating these two cases for the time being |
| None => path.first_segment().and_then(|it| it.name_ref()).and_then(|name_ref| { |
| ToolModule::by_name(db, self.resolver.krate().into(), &name_ref.text()) |
| .map(PathResolution::ToolModule) |
| }), |
| }; |
| } |
| if parent().map_or(false, |it| ast::Visibility::can_cast(it.kind())) { |
| resolve_hir_path_qualifier(db, &self.resolver, &hir_path) |
| } else { |
| resolve_hir_path_(db, &self.resolver, &hir_path, prefer_value_ns) |
| } |
| } |
| |
| pub(crate) fn record_literal_missing_fields( |
| &self, |
| db: &dyn HirDatabase, |
| literal: &ast::RecordExpr, |
| ) -> Option<Vec<(Field, Type)>> { |
| let body = self.body()?; |
| let infer = self.infer.as_ref()?; |
| |
| let expr_id = self.expr_id(db, &literal.clone().into())?; |
| let substs = infer[expr_id].as_adt()?.1; |
| |
| let (variant, missing_fields, _exhaustive) = match expr_id { |
| ExprOrPatId::ExprId(expr_id) => { |
| record_literal_missing_fields(db, infer, expr_id, &body[expr_id])? |
| } |
| ExprOrPatId::PatId(pat_id) => { |
| record_pattern_missing_fields(db, infer, pat_id, &body[pat_id])? |
| } |
| }; |
| let res = self.missing_fields(db, substs, variant, missing_fields); |
| Some(res) |
| } |
| |
| pub(crate) fn record_pattern_missing_fields( |
| &self, |
| db: &dyn HirDatabase, |
| pattern: &ast::RecordPat, |
| ) -> Option<Vec<(Field, Type)>> { |
| let body = self.body()?; |
| let infer = self.infer.as_ref()?; |
| |
| let pat_id = self.pat_id(&pattern.clone().into())?; |
| let substs = infer.type_of_pat[pat_id].as_adt()?.1; |
| |
| let (variant, missing_fields, _exhaustive) = |
| record_pattern_missing_fields(db, infer, pat_id, &body[pat_id])?; |
| let res = self.missing_fields(db, substs, variant, missing_fields); |
| Some(res) |
| } |
| |
| fn missing_fields( |
| &self, |
| db: &dyn HirDatabase, |
| substs: &Substitution, |
| variant: VariantId, |
| missing_fields: Vec<LocalFieldId>, |
| ) -> Vec<(Field, Type)> { |
| let field_types = db.field_types(variant); |
| |
| missing_fields |
| .into_iter() |
| .map(|local_id| { |
| let field = FieldId { parent: variant, local_id }; |
| let ty = field_types[local_id].clone().substitute(Interner, substs); |
| (field.into(), Type::new_with_resolver_inner(db, &self.resolver, ty)) |
| }) |
| .collect() |
| } |
| |
| pub(crate) fn expand( |
| &self, |
| db: &dyn HirDatabase, |
| macro_call: InFile<&ast::MacroCall>, |
| ) -> Option<MacroFileId> { |
| let krate = self.resolver.krate(); |
| // FIXME: This causes us to parse, generally this is the wrong approach for resolving a |
| // macro call to a macro call id! |
| let macro_call_id = macro_call.as_call_id(db.upcast(), krate, |path| { |
| self.resolver.resolve_path_as_macro_def(db.upcast(), path, Some(MacroSubNs::Bang)) |
| })?; |
| // why the 64? |
| Some(macro_call_id.as_macro_file()).filter(|it| it.expansion_level(db.upcast()) < 64) |
| } |
| |
| pub(crate) fn resolve_variant( |
| &self, |
| db: &dyn HirDatabase, |
| record_lit: ast::RecordExpr, |
| ) -> Option<VariantId> { |
| let infer = self.infer.as_ref()?; |
| let expr_id = self.expr_id(db, &record_lit.into())?; |
| infer.variant_resolution_for_expr_or_pat(expr_id) |
| } |
| |
| pub(crate) fn is_unsafe_macro_call_expr( |
| &self, |
| db: &dyn HirDatabase, |
| macro_expr: InFile<&ast::MacroExpr>, |
| ) -> bool { |
| if let (Some((def, body, sm)), Some(infer)) = (&self.def, &self.infer) { |
| if let Some(expanded_expr) = sm.macro_expansion_expr(macro_expr) { |
| let mut is_unsafe = false; |
| let mut walk_expr = |expr_id| { |
| unsafe_expressions( |
| db, |
| infer, |
| *def, |
| body, |
| expr_id, |
| &mut |UnsafeExpr { inside_unsafe_block, .. }| { |
| is_unsafe |= !inside_unsafe_block |
| }, |
| ) |
| }; |
| match expanded_expr { |
| ExprOrPatId::ExprId(expanded_expr) => walk_expr(expanded_expr), |
| ExprOrPatId::PatId(expanded_pat) => { |
| body.walk_exprs_in_pat(expanded_pat, &mut walk_expr) |
| } |
| } |
| return is_unsafe; |
| } |
| } |
| false |
| } |
| |
| pub(crate) fn resolve_offset_in_format_args( |
| &self, |
| db: &dyn HirDatabase, |
| format_args: InFile<&ast::FormatArgsExpr>, |
| offset: TextSize, |
| ) -> Option<(TextRange, Option<PathResolution>)> { |
| let implicits = self.body_source_map()?.implicit_format_args(format_args)?; |
| implicits.iter().find(|(range, _)| range.contains_inclusive(offset)).map(|(range, name)| { |
| ( |
| *range, |
| resolve_hir_value_path( |
| db, |
| &self.resolver, |
| self.resolver.body_owner(), |
| &Path::from_known_path_with_no_generic(ModPath::from_segments( |
| PathKind::Plain, |
| Some(name.clone()), |
| )), |
| ), |
| ) |
| }) |
| } |
| |
| pub(crate) fn resolve_offset_in_asm_template( |
| &self, |
| asm: InFile<&ast::AsmExpr>, |
| line: usize, |
| offset: TextSize, |
| ) -> Option<(DefWithBodyId, (ExprId, TextRange, usize))> { |
| let (def, _, body_source_map) = self.def.as_ref()?; |
| let (expr, args) = body_source_map.asm_template_args(asm)?; |
| Some(*def).zip( |
| args.get(line)? |
| .iter() |
| .find(|(range, _)| range.contains_inclusive(offset)) |
| .map(|(range, idx)| (expr, *range, *idx)), |
| ) |
| } |
| |
| pub(crate) fn as_format_args_parts<'a>( |
| &'a self, |
| db: &'a dyn HirDatabase, |
| format_args: InFile<&ast::FormatArgsExpr>, |
| ) -> Option<impl Iterator<Item = (TextRange, Option<PathResolution>)> + 'a> { |
| Some(self.body_source_map()?.implicit_format_args(format_args)?.iter().map( |
| move |(range, name)| { |
| ( |
| *range, |
| resolve_hir_value_path( |
| db, |
| &self.resolver, |
| self.resolver.body_owner(), |
| &Path::from_known_path_with_no_generic(ModPath::from_segments( |
| PathKind::Plain, |
| Some(name.clone()), |
| )), |
| ), |
| ) |
| }, |
| )) |
| } |
| |
| pub(crate) fn as_asm_parts( |
| &self, |
| asm: InFile<&ast::AsmExpr>, |
| ) -> Option<(DefWithBodyId, (ExprId, &[Vec<(TextRange, usize)>]))> { |
| let (def, _, body_source_map) = self.def.as_ref()?; |
| Some(*def).zip(body_source_map.asm_template_args(asm)) |
| } |
| |
| fn resolve_impl_method_or_trait_def( |
| &self, |
| db: &dyn HirDatabase, |
| func: FunctionId, |
| substs: Substitution, |
| ) -> FunctionId { |
| let owner = match self.resolver.body_owner() { |
| Some(it) => it, |
| None => return func, |
| }; |
| let env = db.trait_environment_for_body(owner); |
| db.lookup_impl_method(env, func, substs).0 |
| } |
| |
| fn resolve_impl_const_or_trait_def( |
| &self, |
| db: &dyn HirDatabase, |
| const_id: ConstId, |
| subs: Substitution, |
| ) -> ConstId { |
| let owner = match self.resolver.body_owner() { |
| Some(it) => it, |
| None => return const_id, |
| }; |
| let env = db.trait_environment_for_body(owner); |
| method_resolution::lookup_impl_const(db, env, const_id, subs).0 |
| } |
| |
| fn lang_trait_fn( |
| &self, |
| db: &dyn HirDatabase, |
| lang_trait: LangItem, |
| method_name: &Name, |
| ) -> Option<(TraitId, FunctionId)> { |
| let trait_id = db.lang_item(self.resolver.krate(), lang_trait)?.as_trait()?; |
| let fn_id = db.trait_data(trait_id).method_by_name(method_name)?; |
| Some((trait_id, fn_id)) |
| } |
| |
| fn ty_of_expr(&self, db: &dyn HirDatabase, expr: &ast::Expr) -> Option<&Ty> { |
| self.infer.as_ref()?.type_of_expr_or_pat(self.expr_id(db, expr)?) |
| } |
| } |
| |
| fn scope_for( |
| db: &dyn HirDatabase, |
| scopes: &ExprScopes, |
| source_map: &BodySourceMap, |
| node: InFile<&SyntaxNode>, |
| ) -> Option<ScopeId> { |
| node.ancestors_with_macros(db.upcast()) |
| .take_while(|it| !ast::Item::can_cast(it.kind()) || ast::MacroCall::can_cast(it.kind())) |
| .filter_map(|it| it.map(ast::Expr::cast).transpose()) |
| .filter_map(|it| source_map.node_expr(it.as_ref())?.as_expr()) |
| .find_map(|it| scopes.scope_for(it)) |
| } |
| |
| fn scope_for_offset( |
| db: &dyn HirDatabase, |
| scopes: &ExprScopes, |
| source_map: &BodySourceMap, |
| from_file: HirFileId, |
| offset: TextSize, |
| ) -> Option<ScopeId> { |
| scopes |
| .scope_by_expr() |
| .iter() |
| .filter_map(|(id, scope)| { |
| let InFile { file_id, value } = source_map.expr_syntax(id).ok()?; |
| if from_file == file_id { |
| return Some((value.text_range(), scope)); |
| } |
| |
| // FIXME handle attribute expansion |
| let source = |
| iter::successors(file_id.macro_file().map(|it| it.call_node(db.upcast())), |it| { |
| Some(it.file_id.macro_file()?.call_node(db.upcast())) |
| }) |
| .find(|it| it.file_id == from_file) |
| .filter(|it| it.kind() == SyntaxKind::MACRO_CALL)?; |
| Some((source.text_range(), scope)) |
| }) |
| .filter(|(expr_range, _scope)| expr_range.start() <= offset && offset <= expr_range.end()) |
| // find containing scope |
| .min_by_key(|(expr_range, _scope)| expr_range.len()) |
| .map(|(expr_range, scope)| { |
| adjust(db, scopes, source_map, expr_range, from_file, offset).unwrap_or(*scope) |
| }) |
| } |
| |
| // XXX: during completion, cursor might be outside of any particular |
| // expression. Try to figure out the correct scope... |
| fn adjust( |
| db: &dyn HirDatabase, |
| scopes: &ExprScopes, |
| source_map: &BodySourceMap, |
| expr_range: TextRange, |
| from_file: HirFileId, |
| offset: TextSize, |
| ) -> Option<ScopeId> { |
| let child_scopes = scopes |
| .scope_by_expr() |
| .iter() |
| .filter_map(|(id, scope)| { |
| let source = source_map.expr_syntax(id).ok()?; |
| // FIXME: correctly handle macro expansion |
| if source.file_id != from_file { |
| return None; |
| } |
| let root = source.file_syntax(db.upcast()); |
| let node = source.value.to_node(&root); |
| Some((node.syntax().text_range(), scope)) |
| }) |
| .filter(|&(range, _)| { |
| range.start() <= offset && expr_range.contains_range(range) && range != expr_range |
| }); |
| |
| child_scopes |
| .max_by(|&(r1, _), &(r2, _)| { |
| if r1.contains_range(r2) { |
| std::cmp::Ordering::Greater |
| } else if r2.contains_range(r1) { |
| std::cmp::Ordering::Less |
| } else { |
| r1.start().cmp(&r2.start()) |
| } |
| }) |
| .map(|(_ptr, scope)| *scope) |
| } |
| |
| #[inline] |
| pub(crate) fn resolve_hir_path( |
| db: &dyn HirDatabase, |
| resolver: &Resolver, |
| path: &Path, |
| ) -> Option<PathResolution> { |
| resolve_hir_path_(db, resolver, path, false) |
| } |
| |
| #[inline] |
| pub(crate) fn resolve_hir_path_as_attr_macro( |
| db: &dyn HirDatabase, |
| resolver: &Resolver, |
| path: &Path, |
| ) -> Option<Macro> { |
| resolver |
| .resolve_path_as_macro(db.upcast(), path.mod_path()?, Some(MacroSubNs::Attr)) |
| .map(|(it, _)| it) |
| .map(Into::into) |
| } |
| |
| fn resolve_hir_path_( |
| db: &dyn HirDatabase, |
| resolver: &Resolver, |
| path: &Path, |
| prefer_value_ns: bool, |
| ) -> Option<PathResolution> { |
| let types = || { |
| let (ty, unresolved) = match path.type_anchor() { |
| Some(type_ref) => { |
| let (_, res) = |
| TyLoweringContext::new_maybe_unowned(db, resolver, resolver.type_owner()) |
| .lower_ty_ext(type_ref); |
| res.map(|ty_ns| (ty_ns, path.segments().first())) |
| } |
| None => { |
| let (ty, remaining_idx, _) = resolver.resolve_path_in_type_ns(db.upcast(), path)?; |
| match remaining_idx { |
| Some(remaining_idx) => { |
| if remaining_idx + 1 == path.segments().len() { |
| Some((ty, path.segments().last())) |
| } else { |
| None |
| } |
| } |
| None => Some((ty, None)), |
| } |
| } |
| }?; |
| |
| // If we are in a TypeNs for a Trait, and we have an unresolved name, try to resolve it as a type |
| // within the trait's associated types. |
| if let (Some(unresolved), &TypeNs::TraitId(trait_id)) = (&unresolved, &ty) { |
| if let Some(type_alias_id) = |
| db.trait_data(trait_id).associated_type_by_name(unresolved.name) |
| { |
| return Some(PathResolution::Def(ModuleDefId::from(type_alias_id).into())); |
| } |
| } |
| |
| let res = match ty { |
| TypeNs::SelfType(it) => PathResolution::SelfType(it.into()), |
| TypeNs::GenericParam(id) => PathResolution::TypeParam(id.into()), |
| TypeNs::AdtSelfType(it) | TypeNs::AdtId(it) => { |
| PathResolution::Def(Adt::from(it).into()) |
| } |
| TypeNs::EnumVariantId(it) => PathResolution::Def(Variant::from(it).into()), |
| TypeNs::TypeAliasId(it) => PathResolution::Def(TypeAlias::from(it).into()), |
| TypeNs::BuiltinType(it) => PathResolution::Def(BuiltinType::from(it).into()), |
| TypeNs::TraitId(it) => PathResolution::Def(Trait::from(it).into()), |
| TypeNs::TraitAliasId(it) => PathResolution::Def(TraitAlias::from(it).into()), |
| }; |
| match unresolved { |
| Some(unresolved) => resolver |
| .generic_def() |
| .and_then(|def| { |
| hir_ty::associated_type_shorthand_candidates( |
| db, |
| def, |
| res.in_type_ns()?, |
| |name, id| (name == unresolved.name).then_some(id), |
| ) |
| }) |
| .map(TypeAlias::from) |
| .map(Into::into) |
| .map(PathResolution::Def), |
| None => Some(res), |
| } |
| }; |
| |
| let body_owner = resolver.body_owner(); |
| let values = || resolve_hir_value_path(db, resolver, body_owner, path); |
| |
| let items = || { |
| resolver |
| .resolve_module_path_in_items(db.upcast(), path.mod_path()?) |
| .take_types() |
| .map(|it| PathResolution::Def(it.into())) |
| }; |
| |
| let macros = || { |
| resolver |
| .resolve_path_as_macro(db.upcast(), path.mod_path()?, None) |
| .map(|(def, _)| PathResolution::Def(ModuleDef::Macro(def.into()))) |
| }; |
| |
| if prefer_value_ns { values().or_else(types) } else { types().or_else(values) } |
| .or_else(items) |
| .or_else(macros) |
| } |
| |
| fn resolve_hir_value_path( |
| db: &dyn HirDatabase, |
| resolver: &Resolver, |
| body_owner: Option<DefWithBodyId>, |
| path: &Path, |
| ) -> Option<PathResolution> { |
| resolver.resolve_path_in_value_ns_fully(db.upcast(), path).and_then(|val| { |
| let res = match val { |
| ValueNs::LocalBinding(binding_id) => { |
| let var = Local { parent: body_owner?, binding_id }; |
| PathResolution::Local(var) |
| } |
| ValueNs::FunctionId(it) => PathResolution::Def(Function::from(it).into()), |
| ValueNs::ConstId(it) => PathResolution::Def(Const::from(it).into()), |
| ValueNs::StaticId(it) => PathResolution::Def(Static::from(it).into()), |
| ValueNs::StructId(it) => PathResolution::Def(Struct::from(it).into()), |
| ValueNs::EnumVariantId(it) => PathResolution::Def(Variant::from(it).into()), |
| ValueNs::ImplSelf(impl_id) => PathResolution::SelfType(impl_id.into()), |
| ValueNs::GenericParam(id) => PathResolution::ConstParam(id.into()), |
| }; |
| Some(res) |
| }) |
| } |
| |
| /// Resolves a path where we know it is a qualifier of another path. |
| /// |
| /// For example, if we have: |
| /// ``` |
| /// mod my { |
| /// pub mod foo { |
| /// struct Bar; |
| /// } |
| /// |
| /// pub fn foo() {} |
| /// } |
| /// ``` |
| /// then we know that `foo` in `my::foo::Bar` refers to the module, not the function. |
| fn resolve_hir_path_qualifier( |
| db: &dyn HirDatabase, |
| resolver: &Resolver, |
| path: &Path, |
| ) -> Option<PathResolution> { |
| (|| { |
| let (ty, unresolved) = match path.type_anchor() { |
| Some(type_ref) => { |
| let (_, res) = |
| TyLoweringContext::new_maybe_unowned(db, resolver, resolver.type_owner()) |
| .lower_ty_ext(type_ref); |
| res.map(|ty_ns| (ty_ns, path.segments().first())) |
| } |
| None => { |
| let (ty, remaining_idx, _) = resolver.resolve_path_in_type_ns(db.upcast(), path)?; |
| match remaining_idx { |
| Some(remaining_idx) => { |
| if remaining_idx + 1 == path.segments().len() { |
| Some((ty, path.segments().last())) |
| } else { |
| None |
| } |
| } |
| None => Some((ty, None)), |
| } |
| } |
| }?; |
| |
| // If we are in a TypeNs for a Trait, and we have an unresolved name, try to resolve it as a type |
| // within the trait's associated types. |
| if let (Some(unresolved), &TypeNs::TraitId(trait_id)) = (&unresolved, &ty) { |
| if let Some(type_alias_id) = |
| db.trait_data(trait_id).associated_type_by_name(unresolved.name) |
| { |
| return Some(PathResolution::Def(ModuleDefId::from(type_alias_id).into())); |
| } |
| } |
| |
| let res = match ty { |
| TypeNs::SelfType(it) => PathResolution::SelfType(it.into()), |
| TypeNs::GenericParam(id) => PathResolution::TypeParam(id.into()), |
| TypeNs::AdtSelfType(it) | TypeNs::AdtId(it) => { |
| PathResolution::Def(Adt::from(it).into()) |
| } |
| TypeNs::EnumVariantId(it) => PathResolution::Def(Variant::from(it).into()), |
| TypeNs::TypeAliasId(it) => PathResolution::Def(TypeAlias::from(it).into()), |
| TypeNs::BuiltinType(it) => PathResolution::Def(BuiltinType::from(it).into()), |
| TypeNs::TraitId(it) => PathResolution::Def(Trait::from(it).into()), |
| TypeNs::TraitAliasId(it) => PathResolution::Def(TraitAlias::from(it).into()), |
| }; |
| match unresolved { |
| Some(unresolved) => resolver |
| .generic_def() |
| .and_then(|def| { |
| hir_ty::associated_type_shorthand_candidates( |
| db, |
| def, |
| res.in_type_ns()?, |
| |name, id| (name == unresolved.name).then_some(id), |
| ) |
| }) |
| .map(TypeAlias::from) |
| .map(Into::into) |
| .map(PathResolution::Def), |
| None => Some(res), |
| } |
| })() |
| .or_else(|| { |
| resolver |
| .resolve_module_path_in_items(db.upcast(), path.mod_path()?) |
| .take_types() |
| .map(|it| PathResolution::Def(it.into())) |
| }) |
| } |
