//! 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::once, sync::Arc}; use hir_def::{ body::{ scope::{ExprScopes, ScopeId}, Body, BodySourceMap, }, expr::{ExprId, Pat, PatId}, path::{ModPath, Path, PathKind}, resolver::{resolver_for_scope, Resolver, TypeNs, ValueNs}, AsMacroCall, DefWithBodyId, FieldId, FunctionId, LocalFieldId, VariantId, }; use hir_expand::{hygiene::Hygiene, name::AsName, HirFileId, InFile}; use hir_ty::{ diagnostics::{record_literal_missing_fields, record_pattern_missing_fields}, InferenceResult, Substitution, }; use syntax::{ ast::{self, AstNode}, SyntaxNode, TextRange, TextSize, }; use crate::{ db::HirDatabase, semantics::PathResolution, Adt, BuiltinType, Const, Field, Function, Local, MacroDef, ModuleDef, Static, Struct, Trait, Type, TypeAlias, TypeParam, Variant, }; use base_db::CrateId; /// `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, body: Option>, body_source_map: Option>, infer: Option>, scopes: Option>, } impl SourceAnalyzer { pub(crate) fn new_for_body( db: &dyn HirDatabase, def: DefWithBodyId, node: InFile<&SyntaxNode>, offset: Option, ) -> SourceAnalyzer { let (body, source_map) = db.body_with_source_map(def); let scopes = db.expr_scopes(def); let scope = match offset { None => scope_for(&scopes, &source_map, node), Some(offset) => scope_for_offset(db, &scopes, &source_map, node.with_value(offset)), }; let resolver = resolver_for_scope(db.upcast(), def, scope); SourceAnalyzer { resolver, body: Some(body), body_source_map: Some(source_map), infer: Some(db.infer(def)), scopes: Some(scopes), file_id: node.file_id, } } pub(crate) fn new_for_resolver( resolver: Resolver, node: InFile<&SyntaxNode>, ) -> SourceAnalyzer { SourceAnalyzer { resolver, body: None, body_source_map: None, infer: None, scopes: None, file_id: node.file_id, } } fn expr_id(&self, db: &dyn HirDatabase, expr: &ast::Expr) -> Option { let src = match expr { ast::Expr::MacroCall(call) => { self.expand_expr(db, InFile::new(self.file_id, call.clone()))? } _ => InFile::new(self.file_id, expr.clone()), }; let sm = self.body_source_map.as_ref()?; sm.node_expr(src.as_ref()) } fn pat_id(&self, pat: &ast::Pat) -> Option { // FIXME: macros, see `expr_id` let src = InFile { file_id: self.file_id, value: pat }; self.body_source_map.as_ref()?.node_pat(src) } fn expand_expr( &self, db: &dyn HirDatabase, expr: InFile, ) -> Option> { let macro_file = self.body_source_map.as_ref()?.node_macro_file(expr.as_ref())?; let expanded = db.parse_or_expand(macro_file)?; let res = match ast::MacroCall::cast(expanded.clone()) { Some(call) => self.expand_expr(db, InFile::new(macro_file, call))?, _ => InFile::new(macro_file, ast::Expr::cast(expanded)?), }; Some(res) } pub(crate) fn type_of_expr(&self, db: &dyn HirDatabase, expr: &ast::Expr) -> Option { let expr_id = self.expr_id(db, expr)?; let ty = self.infer.as_ref()?[expr_id].clone(); Type::new_with_resolver(db, &self.resolver, ty) } pub(crate) fn type_of_pat(&self, db: &dyn HirDatabase, pat: &ast::Pat) -> Option { let pat_id = self.pat_id(pat)?; let ty = self.infer.as_ref()?[pat_id].clone(); Type::new_with_resolver(db, &self.resolver, ty) } pub(crate) fn type_of_self( &self, db: &dyn HirDatabase, param: &ast::SelfParam, ) -> Option { let src = InFile { file_id: self.file_id, value: param }; let pat_id = self.body_source_map.as_ref()?.node_self_param(src)?; let ty = self.infer.as_ref()?[pat_id].clone(); Type::new_with_resolver(db, &self.resolver, ty) } pub(crate) fn resolve_method_call( &self, db: &dyn HirDatabase, call: &ast::MethodCallExpr, ) -> Option { let expr_id = self.expr_id(db, &call.clone().into())?; self.infer.as_ref()?.method_resolution(expr_id) } pub(crate) fn resolve_field( &self, db: &dyn HirDatabase, field: &ast::FieldExpr, ) -> Option { let expr_id = self.expr_id(db, &field.clone().into())?; self.infer.as_ref()?.field_resolution(expr_id).map(|it| it.into()) } pub(crate) fn resolve_record_field( &self, db: &dyn HirDatabase, field: &ast::RecordExprField, ) -> Option<(Field, Option)> { let expr_id = self.body_source_map.as_ref()?.node_field(InFile::new(self.file_id, field))?; let local = if field.name_ref().is_some() { None } else { let local_name = field.field_name()?.as_name(); let path = ModPath::from_segments(PathKind::Plain, once(local_name)); match self.resolver.resolve_path_in_value_ns_fully(db.upcast(), &path) { Some(ValueNs::LocalBinding(pat_id)) => { Some(Local { pat_id, parent: self.resolver.body_owner()? }) } _ => None, } }; let struct_field = self.infer.as_ref()?.record_field_resolution(expr_id)?; Some((struct_field.into(), local)) } pub(crate) fn resolve_record_pat_field( &self, _db: &dyn HirDatabase, field: &ast::RecordPatField, ) -> Option { let pat_id = self.pat_id(&field.pat()?)?; let struct_field = self.infer.as_ref()?.record_pat_field_resolution(pat_id)?; Some(struct_field.into()) } pub(crate) fn resolve_macro_call( &self, db: &dyn HirDatabase, macro_call: InFile<&ast::MacroCall>, ) -> Option { let hygiene = Hygiene::new(db.upcast(), macro_call.file_id); let path = macro_call.value.path().and_then(|ast| Path::from_src(ast, &hygiene))?; self.resolver.resolve_path_as_macro(db.upcast(), path.mod_path()).map(|it| it.into()) } pub(crate) fn resolve_bind_pat_to_const( &self, db: &dyn HirDatabase, pat: &ast::IdentPat, ) -> Option { let pat_id = self.pat_id(&pat.clone().into())?; let body = self.body.as_ref()?; 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 { let parent = || path.syntax().parent(); let mut prefer_value_ns = false; if let Some(path_expr) = parent().and_then(ast::PathExpr::cast) { let expr_id = self.expr_id(db, &path_expr.into())?; let infer = self.infer.as_ref()?; if let Some(assoc) = infer.assoc_resolutions_for_expr(expr_id) { return Some(PathResolution::AssocItem(assoc.into())); } if let Some(VariantId::EnumVariantId(variant)) = infer.variant_resolution_for_expr(expr_id) { return Some(PathResolution::Def(ModuleDef::Variant(variant.into()))); } prefer_value_ns = true; } if let Some(path_pat) = parent().and_then(ast::PathPat::cast) { let pat_id = self.pat_id(&path_pat.into())?; if let Some(assoc) = self.infer.as_ref()?.assoc_resolutions_for_pat(pat_id) { return Some(PathResolution::AssocItem(assoc.into())); } if let Some(VariantId::EnumVariantId(variant)) = self.infer.as_ref()?.variant_resolution_for_pat(pat_id) { return Some(PathResolution::Def(ModuleDef::Variant(variant.into()))); } } 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)) = self.infer.as_ref()?.variant_resolution_for_expr(expr_id) { return Some(PathResolution::Def(ModuleDef::Variant(variant.into()))); } } if let Some(pat) = parent() .and_then(ast::RecordPat::cast) .map(ast::Pat::from) .or_else(|| parent().and_then(ast::TupleStructPat::cast).map(ast::Pat::from)) { let pat_id = self.pat_id(&pat)?; if let Some(VariantId::EnumVariantId(variant)) = self.infer.as_ref()?.variant_resolution_for_pat(pat_id) { return Some(PathResolution::Def(ModuleDef::Variant(variant.into()))); } } // This must be a normal source file rather than macro file. let hir_path = Path::from_src(path.clone(), &Hygiene::new(db.upcast(), self.file_id))?; // Case where path is a qualifier of another path, e.g. foo::bar::Baz where we // trying to resolve foo::bar. if let Some(outer_path) = parent().and_then(ast::Path::cast) { if let Some(qualifier) = outer_path.qualifier() { if path == &qualifier { return resolve_hir_path_qualifier(db, &self.resolver, &hir_path); } } } 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> { let krate = self.resolver.krate()?; let body = self.body.as_ref()?; let infer = self.infer.as_ref()?; let expr_id = self.expr_id(db, &literal.clone().into())?; let substs = infer.type_of_expr[expr_id].substs()?; let (variant, missing_fields, _exhaustive) = record_literal_missing_fields(db, infer, expr_id, &body[expr_id])?; let res = self.missing_fields(db, krate, &substs, variant, missing_fields); Some(res) } pub(crate) fn record_pattern_missing_fields( &self, db: &dyn HirDatabase, pattern: &ast::RecordPat, ) -> Option> { let krate = self.resolver.krate()?; let body = self.body.as_ref()?; let infer = self.infer.as_ref()?; let pat_id = self.pat_id(&pattern.clone().into())?; let substs = infer.type_of_pat[pat_id].substs()?; let (variant, missing_fields, _exhaustive) = record_pattern_missing_fields(db, infer, pat_id, &body[pat_id])?; let res = self.missing_fields(db, krate, &substs, variant, missing_fields); Some(res) } fn missing_fields( &self, db: &dyn HirDatabase, krate: CrateId, substs: &Substitution, variant: VariantId, missing_fields: Vec, ) -> 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().subst(substs); (field.into(), Type::new_with_resolver_inner(db, krate, &self.resolver, ty)) }) .collect() } pub(crate) fn expand( &self, db: &dyn HirDatabase, macro_call: InFile<&ast::MacroCall>, ) -> Option { let krate = self.resolver.krate()?; let macro_call_id = macro_call.as_call_id(db.upcast(), krate, |path| { self.resolver.resolve_path_as_macro(db.upcast(), &path) })?; Some(macro_call_id.as_file()).filter(|it| it.expansion_level(db.upcast()) < 64) } pub(crate) fn resolve_variant( &self, db: &dyn HirDatabase, record_lit: ast::RecordExpr, ) -> Option { let infer = self.infer.as_ref()?; let expr_id = self.expr_id(db, &record_lit.into())?; infer.variant_resolution_for_expr(expr_id) } } fn scope_for( scopes: &ExprScopes, source_map: &BodySourceMap, node: InFile<&SyntaxNode>, ) -> Option { node.value .ancestors() .filter_map(ast::Expr::cast) .filter_map(|it| source_map.node_expr(InFile::new(node.file_id, &it))) .find_map(|it| scopes.scope_for(it)) } fn scope_for_offset( db: &dyn HirDatabase, scopes: &ExprScopes, source_map: &BodySourceMap, offset: InFile, ) -> Option { 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 != offset.file_id { return None; } let root = source.file_syntax(db.upcast()); let node = source.value.to_node(&root); Some((node.syntax().text_range(), scope)) }) // find containing scope .min_by_key(|(expr_range, _scope)| { ( !(expr_range.start() <= offset.value && offset.value <= expr_range.end()), expr_range.len(), ) }) .map(|(expr_range, scope)| { adjust(db, scopes, source_map, expr_range, 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, offset: InFile, ) -> Option { 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 != offset.file_id { 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.value && 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 { resolve_hir_path_(db, resolver, path, false) } fn resolve_hir_path_( db: &dyn HirDatabase, resolver: &Resolver, path: &Path, prefer_value_ns: bool, ) -> Option { let types = || { resolver.resolve_path_in_type_ns_fully(db.upcast(), path.mod_path()).map(|ty| match ty { TypeNs::SelfType(it) => PathResolution::SelfType(it.into()), TypeNs::GenericParam(id) => PathResolution::TypeParam(TypeParam { id }), 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()), }) }; let body_owner = resolver.body_owner(); let values = || { resolver.resolve_path_in_value_ns_fully(db.upcast(), path.mod_path()).and_then(|val| { let res = match val { ValueNs::LocalBinding(pat_id) => { let var = Local { parent: body_owner?.into(), pat_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(it) => PathResolution::ConstParam(it.into()), }; Some(res) }) }; 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()) .map(|def| PathResolution::Macro(def.into())) }; if prefer_value_ns { values().or_else(types) } else { types().or_else(values) } .or_else(items) .or_else(macros) } /// 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 { let items = resolver .resolve_module_path_in_items(db.upcast(), path.mod_path()) .take_types() .map(|it| PathResolution::Def(it.into())); if items.is_some() { return items; } resolver.resolve_path_in_type_ns_fully(db.upcast(), path.mod_path()).map(|ty| match ty { TypeNs::SelfType(it) => PathResolution::SelfType(it.into()), TypeNs::GenericParam(id) => PathResolution::TypeParam(TypeParam { id }), 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()), }) }