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https://github.com/rust-lang/rust-analyzer
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33 lines
876 B
Rust
33 lines
876 B
Rust
use hir::db::HirDatabase;
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use ra_syntax::{
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Direction,
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SyntaxKind::COMMA,
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};
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use crate::{AssistCtx, Assist, non_trivia_sibling};
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pub(crate) fn flip_comma(ctx: AssistCtx<impl HirDatabase>) -> Option<Assist> {
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let comma = ctx.leaf_at_offset().find(|leaf| leaf.kind() == COMMA)?;
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let prev = non_trivia_sibling(comma, Direction::Prev)?;
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let next = non_trivia_sibling(comma, Direction::Next)?;
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ctx.build("flip comma", |edit| {
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edit.replace(prev.range(), next.text());
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edit.replace(next.range(), prev.text());
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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::helpers::check_assist;
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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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}
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