Migrate VerticalWhitespaceClosingBracesRule to SwiftSyntax#6118
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Migrate VerticalWhitespaceClosingBracesRule to SwiftSyntax#6118
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jpsim
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## Summary Convert VerticalWhitespaceClosingBracesRule to use SwiftSyntax instead of SourceKit for improved performance and better detection of empty lines before closing braces. ## Key Technical Improvements - **Enhanced trivia analysis** for accurate empty line detection before closing braces - **Proper position calculation** using positionAfterSkippingLeadingTrivia for line numbers - **Improved trivial line detection** supporting any combination of closing braces (`}`, `]`, `)`) - **SwiftSyntax visitor pattern** replacing regex-based detection for better accuracy - **Unified correction logic** handling all newline types (LF, CR, CRLF) consistently ## Migration Details - Replaced `CorrectableRule, OptInRule` with `@SwiftSyntaxRule(correctable: true, optIn: true)` - Implemented `ViolationsSyntaxVisitor` for detecting violations in token leading trivia - Implemented `ViolationsSyntaxRewriter` for correcting violations by modifying trivia - Added proper handling of `only_enforce_before_trivial_lines` configuration option - Maintained exact position reporting for violation locations - Preserved all existing test cases and rule behavior
SimplyDanny
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Collaborator
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Rebased to get the better summary. |
SimplyDanny
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Jun 29, 2025
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| final class Rewriter: ViolationsSyntaxRewriter<VerticalWhitespaceClosingBracesConfiguration> { |
Collaborator
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The rewriter is currently not used at all since the visitor does the replacement already and the rule doesn't specify explicitRewriter: true.
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| private extension VerticalWhitespaceClosingBracesRule { | ||
| final class Visitor: ViolationsSyntaxVisitor<VerticalWhitespaceClosingBracesConfiguration> { |
Collaborator
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Suggested change
| final class Visitor: ViolationsSyntaxVisitor<VerticalWhitespaceClosingBracesConfiguration> { | |
| final class Visitor: ViolationsSyntaxVisitor<ConfigurationType> { |
| } | ||
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| let patternRegex: NSRegularExpression = regex(pattern) | ||
| private func isTokenLineTrivialHelper( |
Collaborator
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What does the "helper" suffix stand for?
Collaborator
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With this rewrite, we see new violations on empty lines preceded by a comment, that is: That's reasonable. So all OSS findings are fine. |
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Summary
Convert VerticalWhitespaceClosingBracesRule to use SwiftSyntax instead
of SourceKit for improved performance and better detection of empty
lines before closing braces.
Key Technical Improvements
before closing braces
positionAfterSkippingLeadingTrivia for line numbers
closing braces (
},],))better accuracy
CRLF) consistently
Migration Details
CorrectableRule, OptInRulewith@SwiftSyntaxRule(correctable: true, optIn: true)ViolationsSyntaxVisitorfor detecting violations intoken leading trivia
ViolationsSyntaxRewriterfor correcting violations bymodifying trivia
only_enforce_before_trivial_linesconfiguration option