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Simplify

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This commit is contained in:
Lukas Wirth 2021-07-01 21:10:45 +02:00
parent 1b9b2d1f40
commit 3d2490ca97
1 changed files with 108 additions and 109 deletions
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217
crates/ide_assists/src/handlers/merge_match_arms.rs
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@ -10,7 +10,7 @@
// Assist: merge_match_arms
//
// Merges identical match arms.
// Merges the current match arm with the following if their bodies are identical.
//
// ```
// enum Action { Move { distance: u32 }, Stop }
@ -44,14 +44,11 @@ pub(crate) fn merge_match_arms(acc: &mut Assists, ctx: &AssistContext) -> Option
// We check if the following match arms match this one. We could, but don't,
// compare to the previous match arm as well.
let arms_to_merge = successors(Some(current_arm), |it| neighbor(it, Direction::Next))
.take_while(|arm| {
if arm.guard().is_some() {
return false;
}
match arm.expr() {
Some(expr) => expr.syntax().text() == current_expr.syntax().text(),
None => false,
.take_while(|arm| match arm.expr() {
Some(expr) if arm.guard().is_none() => {
expr.syntax().text() == current_expr.syntax().text()
}
_ => false,
})
.collect::<Vec<_>>();
@ -77,10 +74,12 @@ pub(crate) fn merge_match_arms(acc: &mut Assists, ctx: &AssistContext) -> Option
let arm = format!("{} => {}", pats, current_expr.syntax().text());
let start = arms_to_merge.first().unwrap().syntax().text_range().start();
let end = arms_to_merge.last().unwrap().syntax().text_range().end();
if let [first, .., last] = &*arms_to_merge {
let start = first.syntax().text_range().start();
let end = last.syntax().text_range().end();
edit.replace(TextRange::new(start, end), arm);
edit.replace(TextRange::new(start, end), arm);
}
},
)
}
@ -100,30 +99,30 @@ fn merge_match_arms_single_patterns() {
check_assist(
merge_match_arms,
r#"
#[derive(Debug)]
enum X { A, B, C }
#[derive(Debug)]
enum X { A, B, C }
fn main() {
let x = X::A;
let y = match x {
X::A => { 1i32$0 }
X::B => { 1i32 }
X::C => { 2i32 }
}
}
"#,
fn main() {
let x = X::A;
let y = match x {
X::A => { 1i32$0 }
X::B => { 1i32 }
X::C => { 2i32 }
}
}
"#,
r#"
#[derive(Debug)]
enum X { A, B, C }
#[derive(Debug)]
enum X { A, B, C }
fn main() {
let x = X::A;
let y = match x {
X::A | X::B => { 1i32 }
X::C => { 2i32 }
}
}
"#,
fn main() {
let x = X::A;
let y = match x {
X::A | X::B => { 1i32 }
X::C => { 2i32 }
}
}
"#,
);
}
@ -132,30 +131,30 @@ fn merge_match_arms_multiple_patterns() {
check_assist(
merge_match_arms,
r#"
#[derive(Debug)]
enum X { A, B, C, D, E }
#[derive(Debug)]
enum X { A, B, C, D, E }
fn main() {
let x = X::A;
let y = match x {
X::A | X::B => {$0 1i32 },
X::C | X::D => { 1i32 },
X::E => { 2i32 },
}
}
"#,
fn main() {
let x = X::A;
let y = match x {
X::A | X::B => {$0 1i32 },
X::C | X::D => { 1i32 },
X::E => { 2i32 },
}
}
"#,
r#"
#[derive(Debug)]
enum X { A, B, C, D, E }
#[derive(Debug)]
enum X { A, B, C, D, E }
fn main() {
let x = X::A;
let y = match x {
X::A | X::B | X::C | X::D => { 1i32 },
X::E => { 2i32 },
}
}
"#,
fn main() {
let x = X::A;
let y = match x {
X::A | X::B | X::C | X::D => { 1i32 },
X::E => { 2i32 },
}
}
"#,
);
}
@ -164,30 +163,30 @@ fn merge_match_arms_placeholder_pattern() {
check_assist(
merge_match_arms,
r#"
#[derive(Debug)]
enum X { A, B, C, D, E }
#[derive(Debug)]
enum X { A, B, C, D, E }
fn main() {
let x = X::A;
let y = match x {
X::A => { 1i32 },
X::B => { 2i$032 },
_ => { 2i32 }
}
}
"#,
fn main() {
let x = X::A;
let y = match x {
X::A => { 1i32 },
X::B => { 2i$032 },
_ => { 2i32 }
}
}
"#,
r#"
#[derive(Debug)]
enum X { A, B, C, D, E }
#[derive(Debug)]
enum X { A, B, C, D, E }
fn main() {
let x = X::A;
let y = match x {
X::A => { 1i32 },
_ => { 2i32 }
}
}
"#,
fn main() {
let x = X::A;
let y = match x {
X::A => { 1i32 },
_ => { 2i32 }
}
}
"#,
);
}
@ -196,29 +195,29 @@ fn merges_all_subsequent_arms() {
check_assist(
merge_match_arms,
r#"
enum X { A, B, C, D, E }
enum X { A, B, C, D, E }
fn main() {
match X::A {
X::A$0 => 92,
X::B => 92,
X::C => 92,
X::D => 62,
_ => panic!(),
}
}
"#,
fn main() {
match X::A {
X::A$0 => 92,
X::B => 92,
X::C => 92,
X::D => 62,
_ => panic!(),
}
}
"#,
r#"
enum X { A, B, C, D, E }
enum X { A, B, C, D, E }
fn main() {
match X::A {
X::A | X::B | X::C => 92,
X::D => 62,
_ => panic!(),
}
}
"#,
fn main() {
match X::A {
X::A | X::B | X::C => 92,
X::D => 62,
_ => panic!(),
}
}
"#,
)
}
@ -227,22 +226,22 @@ fn merge_match_arms_rejects_guards() {
check_assist_not_applicable(
merge_match_arms,
r#"
#[derive(Debug)]
enum X {
A(i32),
B,
C
}
#[derive(Debug)]
enum X {
A(i32),
B,
C
}
fn main() {
let x = X::A;
let y = match x {
X::A(a) if a > 5 => { $01i32 },
X::B => { 1i32 },
X::C => { 2i32 }
}
}
"#,
fn main() {
let x = X::A;
let y = match x {
X::A(a) if a > 5 => { $01i32 },
X::B => { 1i32 },
X::C => { 2i32 }
}
}
"#,
);
}
}