SwiftLint/Source/SwiftLintFramework/Rules/Metrics/ClosureBodyLengthRuleExamples.swift

internal struct ClosureBodyLengthRuleExamples {
    static let nonTriggeringExamples: [Example] = [
        singleLineClosure(),
        trailingClosure(codeLinesCount: 0, commentLinesCount: 0, emptyLinesCount: 0),
        trailingClosure(codeLinesCount: 1, commentLinesCount: 10, emptyLinesCount: 10),
        trailingClosure(codeLinesCount: 19, commentLinesCount: 0, emptyLinesCount: 0),
        trailingClosure(codeLinesCount: 19, commentLinesCount: 10, emptyLinesCount: 10),
        argumentClosure(codeLinesCount: 0),
        argumentClosure(codeLinesCount: 1),
        argumentClosure(codeLinesCount: 19),
        labeledArgumentClosure(codeLinesCount: 0),
        labeledArgumentClosure(codeLinesCount: 1),
        labeledArgumentClosure(codeLinesCount: 19),
        multiLabeledArgumentClosures(codeLinesCount: 19),
        labeledAndTrailingClosures(codeLinesCount: 19),
        lazyInitialization(codeLinesCount: 18)
    ]

    static let triggeringExamples: [Example] = [
        trailingClosure("↓", codeLinesCount: 21, commentLinesCount: 0, emptyLinesCount: 0),
        trailingClosure("↓", codeLinesCount: 21, commentLinesCount: 10, emptyLinesCount: 10),
        argumentClosure("↓", codeLinesCount: 21),
        labeledArgumentClosure("↓", codeLinesCount: 21),
        multiLabeledArgumentClosures("↓", codeLinesCount: 21),
        labeledAndTrailingClosures("↓", codeLinesCount: 21),
        lazyInitialization("↓", codeLinesCount: 19)
    ]
}

// MARK: - Private

private func singleLineClosure(file: StaticString = #file, line: UInt = #line) -> Example {
    return Example("foo.bar { $0 }", file: file, line: line)
}

private func trailingClosure(_ violationSymbol: String = "",
                             codeLinesCount: Int,
                             commentLinesCount: Int,
                             emptyLinesCount: Int,
                             file: StaticString = #file,
                             line: UInt = #line) -> Example {
    return Example("""
        foo.bar \(violationSymbol){ toto in
        \((0..<codeLinesCount).map { "\tlet a\($0) = 0\n" }.joined())\
        \(repeatElement("\t// toto\n", count: commentLinesCount).joined())\
        \(repeatElement("\t\n", count: emptyLinesCount).joined())\
        }
        """, file: file, line: line)
}

private func argumentClosure(_ violationSymbol: String = "",
                             codeLinesCount: Int,
                             file: StaticString = #file,
                             line: UInt = #line) -> Example {
    return Example("""
        foo.bar(\(violationSymbol){ toto in
        \((0..<codeLinesCount).map { "\tlet a\($0) = 0\n" }.joined())\
        })
        """, file: file, line: line)
}

private func labeledArgumentClosure(_ violationSymbol: String = "",
                                    codeLinesCount: Int,
                                    file: StaticString = #file,
                                    line: UInt = #line) -> Example {
    return Example("""
        foo.bar(label: \(violationSymbol){ toto in
        \((0..<codeLinesCount).map { "\tlet a\($0) = 0\n" }.joined())\
        })
        """, file: file, line: line)
}

private func multiLabeledArgumentClosures(_ violationSymbol: String = "",
                                          codeLinesCount: Int,
                                          file: StaticString = #file,
                                          line: UInt = #line) -> Example {
    return Example("""
        foo.bar(label: \(violationSymbol){ toto in
        \((0..<codeLinesCount).map { "\tlet a\($0) = 0\n" }.joined())\
        }, anotherLabel: \(violationSymbol){ toto in
        \((0..<codeLinesCount).map { "\tlet a\($0) = 0\n" }.joined())\
        })
        """, file: file, line: line)
}

private func labeledAndTrailingClosures(_ violationSymbol: String = "",
                                        codeLinesCount: Int,
                                        file: StaticString = #file,
                                        line: UInt = #line) -> Example {
    return Example("""
        foo.bar(label: \(violationSymbol){ toto in
        \((0..<codeLinesCount).map { "\tlet a\($0) = 0\n" }.joined())\
        }) \(violationSymbol){ toto in
        \((0..<codeLinesCount).map { "\tlet a\($0) = 0\n" }.joined())\
        }
        """, file: file, line: line)
}

private func lazyInitialization(_ violationSymbol: String = "",
                                codeLinesCount: Int,
                                file: StaticString = #file,
                                line: UInt = #line) -> Example {
    return Example("""
        let foo: Bar = \(violationSymbol){ toto in
        \tlet bar = Bar()
        \((0..<codeLinesCount).map { "\tlet a\($0) = 0\n" }.joined())\
        \treturn bar
        }()
        """, file: file, line: line)
}