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Fix CodeGenerationFormat to correctly handle trailing trivia when formatting list elements #2864

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15 changes: 12 additions & 3 deletions CodeGeneration/Sources/Utils/CodeGenerationFormat.swift
Original file line number Diff line number Diff line change
Expand Up @@ -158,21 +158,30 @@ public class CodeGenerationFormat: BasicFormat {
}
formattedChildren = formattedChildren.map { child in
var child = child
child.trailingTrivia = Trivia(pieces: child.trailingTrivia.drop(while: \.isSpaceOrTab))

if let firstNonSpaceOrTabIndex = child.trailingTrivia.firstIndex(where: { !$0.isSpaceOrTab }) {
if child.trailingTrivia[firstNonSpaceOrTabIndex].isNewline {
child.trailingTrivia = Trivia(pieces: child.trailingTrivia.suffix(from: firstNonSpaceOrTabIndex))
}
} else {
child.trailingTrivia = Trivia()
}

if !child.startsOnNewline {
child.leadingTrivia = indentedNewline + child.leadingTrivia
}
return child
}
decreaseIndentationLevel()
if let lastChild = formattedChildren.last {
if let lastChild = formattedChildren.last,
!lastChild.trailingTrivia.contains(where: \.isNewline)
{
let nextTokenStartsWithNewline =
lastChild.nextToken(viewMode: .sourceAccurate)?.leadingTrivia.first?.isNewline ?? false
if !nextTokenStartsWithNewline {
formattedChildren[formattedChildren.count - 1] = lastChild.with(
\.trailingTrivia,
indentedNewline
lastChild.trailingTrivia + indentedNewline
)
}
}
Expand Down