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|
use syntax::{
algo::non_trivia_sibling,
ast::{self, AstNode},
Direction, T,
};
use crate::{AssistContext, AssistId, AssistKind, Assists};
// Assist: flip_trait_bound
//
// Flips two trait bounds.
//
// ```
// fn foo<T: Clone +<|> Copy>() { }
// ```
// ->
// ```
// fn foo<T: Copy + Clone>() { }
// ```
pub(crate) fn flip_trait_bound(acc: &mut Assists, ctx: &AssistContext) -> Option<()> {
// We want to replicate the behavior of `flip_binexpr` by only suggesting
// the assist when the cursor is on a `+`
let plus = ctx.find_token_at_offset(T![+])?;
// Make sure we're in a `TypeBoundList`
if ast::TypeBoundList::cast(plus.parent()).is_none() {
return None;
}
let (before, after) = (
non_trivia_sibling(plus.clone().into(), Direction::Prev)?,
non_trivia_sibling(plus.clone().into(), Direction::Next)?,
);
let target = plus.text_range();
acc.add(
AssistId("flip_trait_bound", AssistKind::RefactorRewrite),
"Flip trait bounds",
target,
|edit| {
edit.replace(before.text_range(), after.to_string());
edit.replace(after.text_range(), before.to_string());
},
)
}
#[cfg(test)]
mod tests {
use super::*;
use crate::tests::{check_assist, check_assist_not_applicable, check_assist_target};
#[test]
fn flip_trait_bound_assist_available() {
check_assist_target(flip_trait_bound, "struct S<T> where T: A <|>+ B + C { }", "+")
}
#[test]
fn flip_trait_bound_not_applicable_for_single_trait_bound() {
check_assist_not_applicable(flip_trait_bound, "struct S<T> where T: <|>A { }")
}
#[test]
fn flip_trait_bound_works_for_struct() {
check_assist(
flip_trait_bound,
"struct S<T> where T: A <|>+ B { }",
"struct S<T> where T: B + A { }",
)
}
#[test]
fn flip_trait_bound_works_for_trait_impl() {
check_assist(
flip_trait_bound,
"impl X for S<T> where T: A +<|> B { }",
"impl X for S<T> where T: B + A { }",
)
}
#[test]
fn flip_trait_bound_works_for_fn() {
check_assist(flip_trait_bound, "fn f<T: A <|>+ B>(t: T) { }", "fn f<T: B + A>(t: T) { }")
}
#[test]
fn flip_trait_bound_works_for_fn_where_clause() {
check_assist(
flip_trait_bound,
"fn f<T>(t: T) where T: A +<|> B { }",
"fn f<T>(t: T) where T: B + A { }",
)
}
#[test]
fn flip_trait_bound_works_for_lifetime() {
check_assist(
flip_trait_bound,
"fn f<T>(t: T) where T: A <|>+ 'static { }",
"fn f<T>(t: T) where T: 'static + A { }",
)
}
#[test]
fn flip_trait_bound_works_for_complex_bounds() {
check_assist(
flip_trait_bound,
"struct S<T> where T: A<T> <|>+ b_mod::B<T> + C<T> { }",
"struct S<T> where T: b_mod::B<T> + A<T> + C<T> { }",
)
}
#[test]
fn flip_trait_bound_works_for_long_bounds() {
check_assist(
flip_trait_bound,
"struct S<T> where T: A + B + C + D + E + F +<|> G + H + I + J { }",
"struct S<T> where T: A + B + C + D + E + G + F + H + I + J { }",
)
}
}
|
