111 lines
4.3 KiB
Swift
111 lines
4.3 KiB
Swift
import SwiftSyntax
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struct EmptyParenthesesWithTrailingClosureRule: SwiftSyntaxCorrectableRule, 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: "empty_parentheses_with_trailing_closure",
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name: "Empty Parentheses with Trailing Closure",
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description: "When using trailing closures, empty parentheses should be avoided " +
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"after the method call",
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kind: .style,
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nonTriggeringExamples: [
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Example("[1, 2].map { $0 + 1 }\n"),
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Example("[1, 2].map({ $0 + 1 })\n"),
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Example("[1, 2].reduce(0) { $0 + $1 }"),
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Example("[1, 2].map { number in\n number + 1 \n}\n"),
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Example("let isEmpty = [1, 2].isEmpty()\n"),
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Example("""
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UIView.animateWithDuration(0.3, animations: {
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self.disableInteractionRightView.alpha = 0
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}, completion: { _ in
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()
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})
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""")
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],
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triggeringExamples: [
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Example("[1, 2].map↓() { $0 + 1 }\n"),
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Example("[1, 2].map↓( ) { $0 + 1 }\n"),
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Example("[1, 2].map↓() { number in\n number + 1 \n}\n"),
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Example("[1, 2].map↓( ) { number in\n number + 1 \n}\n"),
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Example("func foo() -> [Int] {\n return [1, 2].map↓() { $0 + 1 }\n}\n")
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],
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corrections: [
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Example("[1, 2].map↓() { $0 + 1 }\n"): Example("[1, 2].map { $0 + 1 }\n"),
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Example("[1, 2].map↓( ) { $0 + 1 }\n"): Example("[1, 2].map { $0 + 1 }\n"),
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Example("[1, 2].map↓() { number in\n number + 1 \n}\n"):
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Example("[1, 2].map { number in\n number + 1 \n}\n"),
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Example("[1, 2].map↓( ) { number in\n number + 1 \n}\n"):
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Example("[1, 2].map { number in\n number + 1 \n}\n"),
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Example("func foo() -> [Int] {\n return [1, 2].map↓() { $0 + 1 }\n}\n"):
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Example("func foo() -> [Int] {\n return [1, 2].map { $0 + 1 }\n}\n"),
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Example("class C {\n#if true\nfunc f() {\n[1, 2].map↓() { $0 + 1 }\n}\n#endif\n}"):
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Example("class C {\n#if true\nfunc f() {\n[1, 2].map { $0 + 1 }\n}\n#endif\n}")
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]
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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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func makeRewriter(file: SwiftLintFile) -> ViolationsSyntaxRewriter? {
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Rewriter(
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locationConverter: file.locationConverter,
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disabledRegions: disabledRegions(file: file)
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)
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}
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}
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private extension EmptyParenthesesWithTrailingClosureRule {
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final class Visitor: ViolationsSyntaxVisitor {
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override func visitPost(_ node: FunctionCallExprSyntax) {
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guard let position = node.violationPosition else {
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return
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}
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violations.append(position)
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}
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}
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private final class Rewriter: SyntaxRewriter, ViolationsSyntaxRewriter {
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private(set) var correctionPositions: [AbsolutePosition] = []
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let locationConverter: SourceLocationConverter
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let disabledRegions: [SourceRange]
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init(locationConverter: SourceLocationConverter, disabledRegions: [SourceRange]) {
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self.locationConverter = locationConverter
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self.disabledRegions = disabledRegions
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}
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override func visit(_ node: FunctionCallExprSyntax) -> ExprSyntax {
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guard
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let violationPosition = node.violationPosition,
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!node.isContainedIn(regions: disabledRegions, locationConverter: locationConverter)
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else {
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return super.visit(node)
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}
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let newNode = node
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.with(\.leftParen, nil)
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.with(\.rightParen, nil)
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.with(\.trailingClosure, node.trailingClosure?.with(\.leadingTrivia, .spaces(1)))
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correctionPositions.append(violationPosition)
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return super.visit(newNode)
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}
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}
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}
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private extension FunctionCallExprSyntax {
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var violationPosition: AbsolutePosition? {
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guard trailingClosure != nil,
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let leftParen,
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argumentList.isEmpty else {
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return nil
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}
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return leftParen.positionAfterSkippingLeadingTrivia
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}
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}
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