43 lines
1.7 KiB
Swift
43 lines
1.7 KiB
Swift
import SwiftSyntax
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struct NoFallthroughOnlyRule: SwiftSyntaxRule, ConfigurationProviderRule {
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var configuration = SeverityConfiguration<Self>(.warning)
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static let description = RuleDescription(
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identifier: "no_fallthrough_only",
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name: "No Fallthrough only",
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description: "Fallthroughs can only be used if the `case` contains at least one other statement",
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kind: .idiomatic,
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nonTriggeringExamples: NoFallthroughOnlyRuleExamples.nonTriggeringExamples,
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triggeringExamples: NoFallthroughOnlyRuleExamples.triggeringExamples
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)
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func makeVisitor(file: SwiftLintFile) -> ViolationsSyntaxVisitor {
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Visitor(viewMode: .sourceAccurate)
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}
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}
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private extension NoFallthroughOnlyRule {
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final class Visitor: ViolationsSyntaxVisitor {
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override func visitPost(_ node: SwitchCaseListSyntax) {
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let cases = node.compactMap { $0.as(SwitchCaseSyntax.self) }
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let localViolations = cases.enumerated()
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.compactMap { index, element -> AbsolutePosition? in
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if let fallthroughStmt = element.statements.onlyElement?.item.as(FallthroughStmtSyntax.self) {
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if case let nextCaseIndex = cases.index(after: index),
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nextCaseIndex < cases.endIndex,
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case let nextCase = cases[nextCaseIndex],
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nextCase.unknownAttr != nil {
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return nil
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}
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return fallthroughStmt.positionAfterSkippingLeadingTrivia
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}
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return nil
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}
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violations.append(contentsOf: localViolations)
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}
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}
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}
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