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use hir::db::HirDatabase;
use ra_syntax::{
Direction,
SyntaxKind::COMMA,
algo::non_trivia_sibling,
};
use crate::{AssistCtx, Assist, AssistId};
pub(crate) fn flip_comma(mut ctx: AssistCtx<impl HirDatabase>) -> Option<Assist> {
let comma = ctx.token_at_offset().find(|leaf| leaf.kind() == COMMA)?;
let prev = non_trivia_sibling(comma.into(), Direction::Prev)?;
let next = non_trivia_sibling(comma.into(), Direction::Next)?;
ctx.add_action(AssistId("flip_comma"), "flip comma", |edit| {
edit.target(comma.range());
edit.replace(prev.range(), next.to_string());
edit.replace(next.range(), prev.to_string());
});
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<(), ()>) {}", ",")
}
}
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