use hir::db::HirDatabase; use ra_syntax::{ Direction, SyntaxKind::COMMA, algo::non_trivia_sibling, }; use crate::{AssistCtx, Assist}; pub(crate) fn flip_comma(mut ctx: AssistCtx) -> Option { let comma = ctx.leaf_at_offset().find(|leaf| leaf.kind() == COMMA)?; let prev = non_trivia_sibling(comma, Direction::Prev)?; let next = non_trivia_sibling(comma, Direction::Next)?; ctx.add_action("flip comma", |edit| { edit.target(comma.range()); edit.replace(prev.range(), next.text()); edit.replace(next.range(), prev.text()); }); ctx.build() } #[cfg(test)] mod tests { use super::*; use crate::helpers::{check_assist, check_assist_target}; #[test] fn flip_comma_works_for_function_parameters() { check_assist( flip_comma, "fn foo(x: i32,<|> y: Result<(), ()>) {}", "fn foo(y: Result<(), ()>,<|> x: i32) {}", ) } #[test] fn flip_comma_target() { check_assist_target(flip_comma, "fn foo(x: i32,<|> y: Result<(), ()>) {}", ",") } }