68 lines
2.2 KiB
Swift
68 lines
2.2 KiB
Swift
import SwiftSyntax
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struct AnonymousArgumentInMultilineClosureRule: SwiftSyntaxRule, OptInRule, ConfigurationProviderRule {
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var configuration = SeverityConfiguration(.warning)
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init() {}
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static let description = RuleDescription(
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identifier: "anonymous_argument_in_multiline_closure",
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name: "Anonymous Argument in Multiline Closure",
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description: "Use named arguments in multiline closures",
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kind: .idiomatic,
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nonTriggeringExamples: [
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Example("closure { $0 }"),
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Example("closure { print($0) }"),
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Example("""
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closure { arg in
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print(arg)
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}
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"""),
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Example("""
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closure { arg in
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nestedClosure { $0 + arg }
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}
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""")
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],
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triggeringExamples: [
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Example("""
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closure {
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print(↓$0)
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}
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""")
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]
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)
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func makeVisitor(file: SwiftLintFile) -> ViolationsSyntaxVisitor {
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Visitor(locationConverter: file.locationConverter)
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}
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}
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private extension AnonymousArgumentInMultilineClosureRule {
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final class Visitor: ViolationsSyntaxVisitor {
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private let locationConverter: SourceLocationConverter
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init(locationConverter: SourceLocationConverter) {
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self.locationConverter = locationConverter
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super.init(viewMode: .sourceAccurate)
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}
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override func visit(_ node: ClosureExprSyntax) -> SyntaxVisitorContinueKind {
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let startLocation = locationConverter.location(for: node.leftBrace.positionAfterSkippingLeadingTrivia)
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let endLocation = locationConverter.location(for: node.rightBrace.endPositionBeforeTrailingTrivia)
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guard let startLine = startLocation.line, let endLine = endLocation.line, startLine != endLine else {
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return .skipChildren
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}
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return .visitChildren
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}
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override func visitPost(_ node: IdentifierExprSyntax) {
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if case .dollarIdentifier = node.identifier.tokenKind {
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violations.append(node.positionAfterSkippingLeadingTrivia)
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}
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}
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}
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}
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