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-rw-r--r--crates/ra_assists/src/assists/flip_trait_bound.rs33
1 files changed, 22 insertions, 11 deletions
diff --git a/crates/ra_assists/src/assists/flip_trait_bound.rs b/crates/ra_assists/src/assists/flip_trait_bound.rs
index 203092d03..1625b241f 100644
--- a/crates/ra_assists/src/assists/flip_trait_bound.rs
+++ b/crates/ra_assists/src/assists/flip_trait_bound.rs
@@ -1,21 +1,32 @@
1//! Assist for swapping traits inside of a trait bound list
2//!
3//! E.g. `A + B` => `B + A` when the cursor is placed by the `+` inside of a
4//! trait bound list
5
6use hir::db::HirDatabase; 1use hir::db::HirDatabase;
7use ra_syntax::{algo::non_trivia_sibling, ast::TypeBoundList, Direction, T}; 2use ra_syntax::{
3 algo::non_trivia_sibling,
4 ast::{self, AstNode},
5 Direction, T,
6};
8 7
9use crate::{Assist, AssistCtx, AssistId}; 8use crate::{Assist, AssistCtx, AssistId};
10 9
11/// Flip trait bound assist. 10// Assist: flip_trait_bound
11//
12// Flips two trait bounds.
13//
14// ```
15// fn foo<T: Clone +<|> Copy>() { }
16// ```
17// ->
18// ```
19// fn foo<T: Copy + Clone>() { }
20// ```
12pub(crate) fn flip_trait_bound(mut ctx: AssistCtx<impl HirDatabase>) -> Option<Assist> { 21pub(crate) fn flip_trait_bound(mut ctx: AssistCtx<impl HirDatabase>) -> Option<Assist> {
13 // Make sure we're in a `TypeBoundList`
14 ctx.node_at_offset::<TypeBoundList>()?;
15
16 // We want to replicate the behavior of `flip_binexpr` by only suggesting 22 // We want to replicate the behavior of `flip_binexpr` by only suggesting
17 // the assist when the cursor is on a `+` 23 // the assist when the cursor is on a `+`
18 let plus = ctx.token_at_offset().find(|tkn| tkn.kind() == T![+])?; 24 let plus = ctx.find_token_at_offset(T![+])?;
25
26 // Make sure we're in a `TypeBoundList`
27 if ast::TypeBoundList::cast(plus.parent()).is_none() {
28 return None;
29 }
19 30
20 let (before, after) = ( 31 let (before, after) = (
21 non_trivia_sibling(plus.clone().into(), Direction::Prev)?, 32 non_trivia_sibling(plus.clone().into(), Direction::Prev)?,