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|
use syntax::{algo::non_trivia_sibling, Direction, T};
use crate::{AssistContext, AssistId, AssistKind, Assists};
// Assist: flip_comma
//
// Flips two comma-separated items.
//
// ```
// fn main() {
// ((1, 2),<|> (3, 4));
// }
// ```
// ->
// ```
// fn main() {
// ((3, 4), (1, 2));
// }
// ```
pub(crate) fn flip_comma(acc: &mut Assists, ctx: &AssistContext) -> Option<()> {
let comma = ctx.find_token_at_offset(T![,])?;
let prev = non_trivia_sibling(comma.clone().into(), Direction::Prev)?;
let next = non_trivia_sibling(comma.clone().into(), Direction::Next)?;
// Don't apply a "flip" in case of a last comma
// that typically comes before punctuation
if next.kind().is_punct() {
return None;
}
acc.add(
AssistId("flip_comma", AssistKind::RefactorRewrite),
"Flip comma",
comma.text_range(),
|edit| {
edit.replace(prev.text_range(), next.to_string());
edit.replace(next.text_range(), prev.to_string());
},
)
}
#[cfg(test)]
mod tests {
use super::*;
use crate::tests::{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<(), ()>) {}", ",")
}
#[test]
#[should_panic]
fn flip_comma_before_punct() {
// See https://github.com/rust-analyzer/rust-analyzer/issues/1619
// "Flip comma" assist shouldn't be applicable to the last comma in enum or struct
// declaration body.
check_assist_target(
flip_comma,
"pub enum Test { \
A,<|> \
}",
",",
);
check_assist_target(
flip_comma,
"pub struct Test { \
foo: usize,<|> \
}",
",",
);
}
}
|
