1 use ide_db::defs::{Definition, NameRefClass};
2 use syntax::{ast, AstNode, SyntaxKind, T};
6 assist_context::{AssistContext, Assists},
10 // Assist: add_turbo_fish
12 // Adds `::<_>` to a call of a generic method or function.
15 // fn make<T>() -> T { todo!() }
22 // fn make<T>() -> T { todo!() }
24 // let x = make::<${0:_}>();
27 pub(crate) fn add_turbo_fish(acc: &mut Assists, ctx: &AssistContext) -> Option<()> {
28 let ident = ctx.find_token_syntax_at_offset(SyntaxKind::IDENT).or_else(|| {
29 let arg_list = ctx.find_node_at_offset::<ast::ArgList>()?;
30 if arg_list.args().count() > 0 {
33 mark::hit!(add_turbo_fish_after_call);
34 arg_list.l_paren_token()?.prev_token().filter(|it| it.kind() == SyntaxKind::IDENT)
36 let next_token = ident.next_token()?;
37 if next_token.kind() == T![::] {
38 mark::hit!(add_turbo_fish_one_fish_is_enough);
41 let name_ref = ast::NameRef::cast(ident.parent())?;
42 let def = match NameRefClass::classify(&ctx.sema, &name_ref)? {
43 NameRefClass::Definition(def) => def,
44 NameRefClass::ExternCrate(_) | NameRefClass::FieldShorthand { .. } => return None,
47 Definition::ModuleDef(hir::ModuleDef::Function(it)) => it,
50 let generics = hir::GenericDef::Function(fun).params(ctx.sema.db);
51 if generics.is_empty() {
52 mark::hit!(add_turbo_fish_non_generic);
56 AssistId("add_turbo_fish", AssistKind::RefactorRewrite),
59 |builder| match ctx.config.snippet_cap {
60 Some(cap) => builder.insert_snippet(cap, ident.text_range().end(), "::<${0:_}>"),
61 None => builder.insert(ident.text_range().end(), "::<_>"),
68 use crate::tests::{check_assist, check_assist_not_applicable};
74 fn add_turbo_fish_function() {
93 fn add_turbo_fish_after_call() {
94 mark::check!(add_turbo_fish_after_call);
113 fn add_turbo_fish_method() {
119 fn make<T>(&self) -> T {}
128 fn make<T>(&self) -> T {}
138 fn add_turbo_fish_one_fish_is_enough() {
139 mark::check!(add_turbo_fish_one_fish_is_enough);
140 check_assist_not_applicable(
152 fn add_turbo_fish_non_generic() {
153 mark::check!(add_turbo_fish_non_generic);
154 check_assist_not_applicable(