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RedundantBraces: remove parens and trailing comma #3868

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Mar 27, 2024
Merged

RedundantBraces: remove parens and trailing comma #3868

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45 changes: 38 additions & 7 deletions scalafmt-core/shared/src/main/scala/org/scalafmt/rewrite/RedundantBraces.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -144,29 +144,60 @@ class RedundantBraces(implicit val ftoks: FormatTokens)

private def onRightParen(left: Replacement)(implicit
ft: FormatToken,
session: Session,
style: ScalafmtConfig
): (Replacement, Replacement) = left.how match {
case ReplacementType.Remove => (left, removeToken)
case ReplacementType.Remove =>
val resOpt = getRightBraceBeforeRightParen(false).map { rb =>
// we'll use right brace later, when applying fewer-braces rewrite
(left, removeToken)
}
resOpt.orNull

case ReplacementType.Replace if {
val lft = left.ft
val ro = ft.meta.rightOwner
(lft.meta.rightOwner eq ro) &&
lft.right.is[Token.LeftBrace] &&
okToReplaceFunctionInSingleArgApply(ro).isDefined
lft.right.is[Token.LeftBrace]
} =>
val pft = ftoks.prevNonComment(ft)
val rb = pft.left
if (rb.is[Token.RightBrace]) {
val pftOpt = getRightBraceBeforeRightParen(true)
def replaceIfAfterRightBrace = pftOpt.map { pft =>
val rb = pft.left
// move right to the end of the function
val rType = new ReplacementType.RemoveAndResurrect(ftoks.prev(pft))
left -> replaceToken("}", rtype = rType) {
// create a shifted token so that any child tree wouldn't own it
new Token.RightBrace(rb.input, rb.dialect, rb.start + 1)
}
} else null // don't know how to Replace
}
replaceIfAfterRightBrace.orNull // don't know how to Replace
case _ => null
}

private def getRightBraceBeforeRightParen(shouldBeRemoved: Boolean)(implicit
ft: FormatToken,
session: Session,
style: ScalafmtConfig
): Option[FormatToken] = {
val pft = ftoks.prevNonComment(ft)
val ok = pft.left match {
case _: Token.Comma => // looks like trailing comma
val pft2 = ftoks.prevNonCommentBefore(pft)
pft2.left.is[Token.RightBrace] &&
session.isRemovedOnLeft(pft2, true) == shouldBeRemoved &&
session.isRemovedOnLeftOpt(pft).getOrElse {
val crt = ftoks.prev(pft)
val crepl = Replacement(this, crt, ReplacementType.Remove, style)
session.claim(crepl)(crt)
true
}
case _: Token.RightBrace =>
!session.isRemovedOnLeft(pft, !shouldBeRemoved)
case _ => false
}
if (ok) Some(pft) else None
}

private def onLeftBrace(implicit
ft: FormatToken,
session: Session,
Expand Down
33 changes: 16 additions & 17 deletions scalafmt-tests/src/test/resources/rewrite/RedundantBraces.stat
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Expand Up @@ -1477,15 +1477,14 @@ object a {
)
}
>>>
Idempotency violated
=> Diff (- obtained, + expected)
object a {
- mtd1(x => x + 1) + mtd2(x => x + 1 x +2)
+ mtd1(x => x + 1) + mtd2(x =>
+ x + 1
+ x + 2,
+ )
}
object a {
mtd1 { x =>
x + 1
} + mtd2 { x =>
x + 1
x + 2
}
}
<<< rewrite with trailing commas: func in parens, infix after, !allowFolding
rewrite.trailingCommas.style = keep
rewrite.trailingCommas.allowFolding = false
Expand All @@ -1503,14 +1502,14 @@ object a {
)
}
>>>
Idempotency violated
=> Diff (- obtained, + expected)
) + mtd2(
- x => x + 1 x +2,
+ x =>
+ x + 1
+ x + 2,
)
object a {
mtd1 { x =>
x + 1
} + mtd2 { x =>
x + 1
x + 2
}
}
<<< rewrite with trailing commas: func in parens and braces, allowFolding
rewrite.rules = [RedundantBraces, RedundantParens]
rewrite.trailingCommas.style = keep
Expand Down
62 changes: 31 additions & 31 deletions scalafmt-tests/src/test/resources/scala3/FewerBraces.stat
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Original file line number Diff line number Diff line change
Expand Up @@ -1934,18 +1934,18 @@ foo
)
>>>
foo
.mtd1(x => x + 1)
.mtd2(x =>
.mtd1 { x =>
x + 1
}
.mtd2 { x =>
x + 1
x + 2
,
)
.mtd3(x =>
}
.mtd3 { x =>
x + 1
x + 2
x + 3
,
)
}
<<< rewrite to fewer braces: func in parens, trailing comma, !allowFolding
rewrite.rules = [RedundantBraces]
rewrite.trailingCommas.style = keep
Expand Down Expand Up @@ -1975,22 +1975,18 @@ foo
)
>>>
foo
.mtd1(
x => x + 1,
)
.mtd2(
x =>
x + 1
x + 2
,
)
.mtd3(
x =>
x + 1
x + 2
x + 3
,
)
.mtd1 { x =>
x + 1
}
.mtd2 { x =>
x + 1
x + 2
}
.mtd3 { x =>
x + 1
x + 2
x + 3
}
<<< rewrite to fewer braces: func in parens, infix after
rewrite.rules = [RedundantBraces]
rewrite.scala3.removeOptionalBraces = {
Expand All @@ -2017,14 +2013,18 @@ object a {
}
>>>
object a:
mtd1(x => x + 1) + mtd2(x =>
x + 1
x + 2
) + mtd3(x =>
x + 1
x + 2
x + 3
)
mtd1 { x =>
x + 1
}
+ mtd2 { x =>
x + 1
x + 2
}
+ mtd3 { x =>
x + 1
x + 2
x + 3
}
<<< rewrite to fewer braces: func in parens and braces
rewrite.rules = [RedundantBraces, RedundantParens]
rewrite.scala3.removeOptionalBraces = {
Expand Down
36 changes: 16 additions & 20 deletions scalafmt-tests/src/test/resources/scala3/FewerBraces_fold.stat
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Original file line number Diff line number Diff line change
Expand Up @@ -1693,14 +1693,14 @@ foo
},
)
>>>
foo.mtd1(x => x + 1).mtd2(x =>
foo.mtd1(x => x + 1).mtd2 { x =>
x + 1
x + 2,
).mtd3(x =>
x + 2
}.mtd3 { x =>
x + 1
x + 2
x + 3,
)
x + 3
}
<<< rewrite to fewer braces: func in parens, trailing comma, !allowFolding
rewrite.rules = [RedundantBraces]
rewrite.trailingCommas.style = always
Expand Down Expand Up @@ -1729,18 +1729,14 @@ foo
},
)
>>>
foo.mtd1(
x => x + 1,
).mtd2(
x =>
x + 1
x + 2,
).mtd3(
x =>
x + 1
x + 2
x + 3,
)
foo.mtd1 { x => x + 1 }.mtd2 { x =>
x + 1
x + 2
}.mtd3 { x =>
x + 1
x + 2
x + 3
}
<<< rewrite to fewer braces: func in parens, infix after
rewrite.rules = [RedundantBraces]
rewrite.scala3.removeOptionalBraces = {
Expand All @@ -1767,14 +1763,14 @@ object a {
}
>>>
object a:
mtd1(x => x + 1) + mtd2(x =>
mtd1(x => x + 1) + mtd2 { x =>
x + 1
x + 2
) + mtd3(x =>
} + mtd3 { x =>
x + 1
x + 2
x + 3
)
}
<<< rewrite to fewer braces: func in parens and braces
rewrite.rules = [RedundantBraces, RedundantParens]
rewrite.scala3.removeOptionalBraces = {
Expand Down
70 changes: 37 additions & 33 deletions scalafmt-tests/src/test/resources/scala3/FewerBraces_keep.stat
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Original file line number Diff line number Diff line change
Expand Up @@ -1905,20 +1905,21 @@ foo
)
>>>
foo
.mtd1(x =>
x + 1,
)
.mtd2(x =>
x + 1
x + 2
,
)
.mtd3(x =>
x + 1
x + 2
x + 3
,
)
.mtd1 {
x =>
x + 1
}
.mtd2 {
x =>
x + 1
x + 2
}
.mtd3 {
x =>
x + 1
x + 2
x + 3
}
<<< rewrite to fewer braces: func in parens, trailing comma, !allowFolding
rewrite.rules = [RedundantBraces]
rewrite.trailingCommas.style = keep
Expand Down Expand Up @@ -1948,23 +1949,21 @@ foo
)
>>>
foo
.mtd1(
.mtd1 {
x =>
x + 1,
)
.mtd2(
x + 1
}
.mtd2 {
x =>
x + 1
x + 2
,
)
.mtd3(
}
.mtd3 {
x =>
x + 1
x + 2
x + 3
,
)
}
<<< rewrite to fewer braces: func in parens, infix after
rewrite.rules = [RedundantBraces]
rewrite.scala3.removeOptionalBraces = {
Expand All @@ -1991,16 +1990,21 @@ object a {
}
>>>
object a:
mtd1(x =>
x + 1
) + mtd2(x =>
x + 1
x + 2
) + mtd3(x =>
x + 1
x + 2
x + 3
)
mtd1 {
x =>
x + 1
}
+ mtd2 {
x =>
x + 1
x + 2
}
+ mtd3 {
x =>
x + 1
x + 2
x + 3
}
<<< rewrite to fewer braces: func in parens and braces
rewrite.rules = [RedundantBraces, RedundantParens]
rewrite.scala3.removeOptionalBraces = {
Expand Down
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