1 use syntax::{algo::non_trivia_sibling, Direction, 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() {
32 AssistId("flip_comma", AssistKind::RefactorRewrite),
36 edit.replace(prev.text_range(), next.to_string());
37 edit.replace(next.text_range(), prev.to_string());
46 use crate::tests::{check_assist, check_assist_target};
49 fn flip_comma_works_for_function_parameters() {
52 r#"fn foo(x: i32,$0 y: Result<(), ()>) {}"#,
53 r#"fn foo(y: Result<(), ()>, x: i32) {}"#,
58 fn flip_comma_target() {
59 check_assist_target(flip_comma, r#"fn foo(x: i32,$0 y: Result<(), ()>) {}"#, ",")
64 fn flip_comma_before_punct() {
65 // See https://github.com/rust-analyzer/rust-analyzer/issues/1619
66 // "Flip comma" assist shouldn't be applicable to the last comma in enum or struct