use ra_db::{FileId, SourceDatabase}; use ra_syntax::{ AstNode, ast, algo::{find_node_at_offset, visit::{visitor, Visitor}}, SyntaxNode, }; use test_utils::tested_by; use hir::Resolution; use crate::{FilePosition, NavigationTarget, db::RootDatabase, RangeInfo}; pub(crate) fn goto_definition( db: &RootDatabase, position: FilePosition, ) -> Option>> { let file = db.parse(position.file_id); let syntax = file.syntax(); if let Some(name_ref) = find_node_at_offset::(syntax, position.offset) { let navs = reference_definition(db, position.file_id, name_ref).to_vec(); return Some(RangeInfo::new(name_ref.syntax().range(), navs.to_vec())); } if let Some(name) = find_node_at_offset::(syntax, position.offset) { let navs = name_definition(db, position.file_id, name)?; return Some(RangeInfo::new(name.syntax().range(), navs)); } None } pub(crate) enum ReferenceResult { Exact(NavigationTarget), Approximate(Vec), } impl ReferenceResult { fn to_vec(self) -> Vec { use self::ReferenceResult::*; match self { Exact(target) => vec![target], Approximate(vec) => vec, } } } pub(crate) fn reference_definition( db: &RootDatabase, file_id: FileId, name_ref: &ast::NameRef, ) -> ReferenceResult { use self::ReferenceResult::*; if let Some(function) = hir::source_binder::function_from_child_node(db, file_id, name_ref.syntax()) { // Check if it is a method if let Some(method_call) = name_ref.syntax().parent().and_then(ast::MethodCallExpr::cast) { tested_by!(goto_definition_works_for_methods); let infer_result = function.infer(db); let syntax_mapping = function.body_source_map(db); let expr = ast::Expr::cast(method_call.syntax()).unwrap(); if let Some(func) = syntax_mapping.node_expr(expr).and_then(|it| infer_result.method_resolution(it)) { return Exact(NavigationTarget::from_function(db, func)); }; } // It could also be a field access if let Some(field_expr) = name_ref.syntax().parent().and_then(ast::FieldExpr::cast) { tested_by!(goto_definition_works_for_fields); let infer_result = function.infer(db); let syntax_mapping = function.body_source_map(db); let expr = ast::Expr::cast(field_expr.syntax()).unwrap(); if let Some(field) = syntax_mapping.node_expr(expr).and_then(|it| infer_result.field_resolution(it)) { return Exact(NavigationTarget::from_field(db, field)); }; } // It could also be a named field if let Some(field_expr) = name_ref.syntax().parent().and_then(ast::NamedField::cast) { tested_by!(goto_definition_works_for_named_fields); let infer_result = function.infer(db); let syntax_mapping = function.body_source_map(db); let struct_lit = field_expr.syntax().ancestors().find_map(ast::StructLit::cast); if let Some(expr) = struct_lit.and_then(|lit| syntax_mapping.node_expr(lit.into())) { let ty = infer_result[expr].clone(); if let hir::Ty::Adt { def_id, .. } = ty { if let hir::AdtDef::Struct(s) = def_id { let hir_path = hir::Path::from_name_ref(name_ref); let hir_name = hir_path.as_ident().unwrap(); if let Some(field) = s.field(db, hir_name) { return Exact(NavigationTarget::from_field(db, field)); } } } } } } // Try name resolution let resolver = hir::source_binder::resolver_for_node(db, file_id, name_ref.syntax()); if let Some(path) = name_ref.syntax().ancestors().find_map(ast::Path::cast).and_then(hir::Path::from_ast) { let resolved = resolver.resolve_path(db, &path); match resolved.clone().take_types().or_else(|| resolved.take_values()) { Some(Resolution::Def(def)) => return Exact(NavigationTarget::from_def(db, def)), Some(Resolution::LocalBinding(pat)) => { let body = resolver.body().expect("no body for local binding"); let syntax_mapping = body.syntax_mapping(db); let ptr = syntax_mapping.pat_syntax(pat).expect("pattern not found in syntax mapping"); let name = path.as_ident().cloned().expect("local binding from a multi-segment path"); let nav = NavigationTarget::from_scope_entry(file_id, name, ptr); return Exact(nav); } Some(Resolution::GenericParam(..)) => { // TODO: go to the generic param def } Some(Resolution::SelfType(_impl_block)) => { // TODO: go to the implemented type } None => {} } } // If that fails try the index based approach. let navs = crate::symbol_index::index_resolve(db, name_ref) .into_iter() .map(NavigationTarget::from_symbol) .collect(); Approximate(navs) } pub(crate) fn name_definition( db: &RootDatabase, file_id: FileId, name: &ast::Name, ) -> Option> { let parent = name.syntax().parent()?; if let Some(module) = ast::Module::cast(&parent) { if module.has_semi() { if let Some(child_module) = hir::source_binder::module_from_declaration(db, file_id, module) { let nav = NavigationTarget::from_module(db, child_module); return Some(vec![nav]); } } } if let Some(nav) = named_target(file_id, &parent) { return Some(vec![nav]); } None } fn named_target(file_id: FileId, node: &SyntaxNode) -> Option { visitor() .visit(|node: &ast::StructDef| NavigationTarget::from_named(file_id, node)) .visit(|node: &ast::EnumDef| NavigationTarget::from_named(file_id, node)) .visit(|node: &ast::EnumVariant| NavigationTarget::from_named(file_id, node)) .visit(|node: &ast::FnDef| NavigationTarget::from_named(file_id, node)) .visit(|node: &ast::TypeAliasDef| NavigationTarget::from_named(file_id, node)) .visit(|node: &ast::ConstDef| NavigationTarget::from_named(file_id, node)) .visit(|node: &ast::StaticDef| NavigationTarget::from_named(file_id, node)) .visit(|node: &ast::TraitDef| NavigationTarget::from_named(file_id, node)) .visit(|node: &ast::NamedFieldDef| NavigationTarget::from_named(file_id, node)) .visit(|node: &ast::Module| NavigationTarget::from_named(file_id, node)) .accept(node) } #[cfg(test)] mod tests { use test_utils::covers; use crate::mock_analysis::analysis_and_position; fn check_goto(fixture: &str, expected: &str) { let (analysis, pos) = analysis_and_position(fixture); let mut navs = analysis.goto_definition(pos).unwrap().unwrap().info; assert_eq!(navs.len(), 1); let nav = navs.pop().unwrap(); nav.assert_match(expected); } #[test] fn goto_definition_works_in_items() { check_goto( " //- /lib.rs struct Foo; enum E { X(Foo<|>) } ", "Foo STRUCT_DEF FileId(1) [0; 11) [7; 10)", ); } #[test] fn goto_definition_resolves_correct_name() { check_goto( " //- /lib.rs use a::Foo; mod a; mod b; enum E { X(Foo<|>) } //- /a.rs struct Foo; //- /b.rs struct Foo; ", "Foo STRUCT_DEF FileId(2) [0; 11) [7; 10)", ); } #[test] fn goto_definition_works_for_module_declaration() { check_goto( " //- /lib.rs mod <|>foo; //- /foo.rs // empty ", "foo SOURCE_FILE FileId(2) [0; 10)", ); check_goto( " //- /lib.rs mod <|>foo; //- /foo/mod.rs // empty ", "foo SOURCE_FILE FileId(2) [0; 10)", ); } #[test] fn goto_definition_works_for_methods() { covers!(goto_definition_works_for_methods); check_goto( " //- /lib.rs struct Foo; impl Foo { fn frobnicate(&self) { } } fn bar(foo: &Foo) { foo.frobnicate<|>(); } ", "frobnicate FN_DEF FileId(1) [27; 52) [30; 40)", ); } #[test] fn goto_definition_works_for_fields() { covers!(goto_definition_works_for_fields); check_goto( " //- /lib.rs struct Foo { spam: u32, } fn bar(foo: &Foo) { foo.spam<|>; } ", "spam NAMED_FIELD_DEF FileId(1) [17; 26) [17; 21)", ); } #[test] fn goto_definition_works_for_named_fields() { covers!(goto_definition_works_for_named_fields); check_goto( " //- /lib.rs struct Foo { spam: u32, } fn bar() -> Foo { Foo { spam<|>: 0, } } ", "spam NAMED_FIELD_DEF FileId(1) [17; 26) [17; 21)", ); } #[test] fn goto_definition_works_when_used_on_definition_name_itself() { check_goto( " //- /lib.rs struct Foo<|> { value: u32 } ", "Foo STRUCT_DEF FileId(1) [0; 25) [7; 10)", ); check_goto( r#" //- /lib.rs struct Foo { field<|>: string, } "#, "field NAMED_FIELD_DEF FileId(1) [17; 30) [17; 22)", ); check_goto( " //- /lib.rs fn foo_test<|>() { } ", "foo_test FN_DEF FileId(1) [0; 17) [3; 11)", ); check_goto( " //- /lib.rs enum Foo<|> { Variant, } ", "Foo ENUM_DEF FileId(1) [0; 25) [5; 8)", ); check_goto( " //- /lib.rs enum Foo { Variant1, Variant2<|>, Variant3, } ", "Variant2 ENUM_VARIANT FileId(1) [29; 37) [29; 37)", ); check_goto( r#" //- /lib.rs static inner<|>: &str = ""; "#, "inner STATIC_DEF FileId(1) [0; 24) [7; 12)", ); check_goto( r#" //- /lib.rs const inner<|>: &str = ""; "#, "inner CONST_DEF FileId(1) [0; 23) [6; 11)", ); check_goto( r#" //- /lib.rs type Thing<|> = Option<()>; "#, "Thing TYPE_ALIAS_DEF FileId(1) [0; 24) [5; 10)", ); check_goto( r#" //- /lib.rs trait Foo<|> { } "#, "Foo TRAIT_DEF FileId(1) [0; 13) [6; 9)", ); check_goto( r#" //- /lib.rs mod bar<|> { } "#, "bar MODULE FileId(1) [0; 11) [4; 7)", ); } }