80 lines
2.0 KiB
Rust
80 lines
2.0 KiB
Rust
use ra_syntax::{algo::non_trivia_sibling, Direction, T};
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use crate::{AssistContext, AssistId, Assists};
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// Assist: flip_comma
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//
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// Flips two comma-separated items.
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//
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// ```
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// fn main() {
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// ((1, 2),<|> (3, 4));
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// }
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// ```
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// ->
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// ```
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// fn main() {
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// ((3, 4), (1, 2));
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// }
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// ```
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pub(crate) fn flip_comma(acc: &mut Assists, ctx: &AssistContext) -> Option<()> {
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let comma = ctx.find_token_at_offset(T![,])?;
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let prev = non_trivia_sibling(comma.clone().into(), Direction::Prev)?;
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let next = non_trivia_sibling(comma.clone().into(), Direction::Next)?;
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// Don't apply a "flip" in case of a last comma
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// that typically comes before punctuation
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if next.kind().is_punct() {
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return None;
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}
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acc.add(AssistId("flip_comma"), "Flip comma", comma.text_range(), |edit| {
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edit.replace(prev.text_range(), next.to_string());
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edit.replace(next.text_range(), prev.to_string());
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})
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use crate::tests::{check_assist, check_assist_target};
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#[test]
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fn flip_comma_works_for_function_parameters() {
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check_assist(
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flip_comma,
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"fn foo(x: i32,<|> y: Result<(), ()>) {}",
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"fn foo(y: Result<(), ()>, x: i32) {}",
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)
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}
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#[test]
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fn flip_comma_target() {
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check_assist_target(flip_comma, "fn foo(x: i32,<|> y: Result<(), ()>) {}", ",")
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}
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#[test]
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#[should_panic]
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fn flip_comma_before_punct() {
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// See https://github.com/rust-analyzer/rust-analyzer/issues/1619
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// "Flip comma" assist shouldn't be applicable to the last comma in enum or struct
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// declaration body.
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check_assist_target(
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flip_comma,
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"pub enum Test { \
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A,<|> \
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}",
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",",
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);
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check_assist_target(
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flip_comma,
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"pub struct Test { \
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foo: usize,<|> \
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}",
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",",
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);
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}
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}
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