1 use syntax::{algo::non_trivia_sibling, Direction, SyntaxKind, T};
3 use crate::{AssistContext, AssistId, AssistKind, Assists};
7 // Flips two comma-separated items.
11 // ((1, 2),$0 (3, 4));
20 pub(crate) fn flip_comma(acc: &mut Assists, ctx: &AssistContext<'_>) -> Option<()> {
21 let comma = ctx.find_token_syntax_at_offset(T![,])?;
22 let prev = non_trivia_sibling(comma.clone().into(), Direction::Prev)?;
23 let next = non_trivia_sibling(comma.clone().into(), Direction::Next)?;
25 // Don't apply a "flip" in case of a last comma
26 // that typically comes before punctuation
27 if next.kind().is_punct() {
31 // Don't apply a "flip" inside the macro call
32 // since macro input are just mere tokens
33 if comma.parent_ancestors().any(|it| it.kind() == SyntaxKind::MACRO_CALL) {
38 AssistId("flip_comma", AssistKind::RefactorRewrite),
42 edit.replace(prev.text_range(), next.to_string());
43 edit.replace(next.text_range(), prev.to_string());
52 use crate::tests::{check_assist, check_assist_not_applicable, check_assist_target};
55 fn flip_comma_works_for_function_parameters() {
58 r#"fn foo(x: i32,$0 y: Result<(), ()>) {}"#,
59 r#"fn foo(y: Result<(), ()>, x: i32) {}"#,
64 fn flip_comma_target() {
65 check_assist_target(flip_comma, r#"fn foo(x: i32,$0 y: Result<(), ()>) {}"#, ",")
69 fn flip_comma_before_punct() {
70 // See https://github.com/rust-lang/rust-analyzer/issues/1619
71 // "Flip comma" assist shouldn't be applicable to the last comma in enum or struct
73 check_assist_not_applicable(flip_comma, "pub enum Test { A,$0 }");
74 check_assist_not_applicable(flip_comma, "pub struct Test { foo: usize,$0 }");
78 fn flip_comma_works() {
81 r#"fn main() {((1, 2),$0 (3, 4));}"#,
82 r#"fn main() {((3, 4), (1, 2));}"#,
87 fn flip_comma_not_applicable_for_macro_input() {
88 // "Flip comma" assist shouldn't be applicable inside the macro call
89 // See https://github.com/rust-lang/rust-analyzer/issues/7693
90 check_assist_not_applicable(flip_comma, r#"bar!(a,$0 b)"#);