How to use c99ExtendedIdentifier method of QCKObjCStringUtils class

1#if canImport(Darwin)
2import Foundation
3
4extension String {
5    private static var invalidCharacters: CharacterSet = {
6        var invalidCharacters = CharacterSet()
7
8        let invalidCharacterSets: [CharacterSet] = [
9            .whitespacesAndNewlines,
10            .illegalCharacters,
11            .controlCharacters,
12            .punctuationCharacters,
13            .nonBaseCharacters,
14            .symbols
15        ]
16
17        for invalidSet in invalidCharacterSets {
18            invalidCharacters.formUnion(invalidSet)
19        }
20
21        return invalidCharacters
22    }()
23
24    internal var c99ExtendedIdentifier: String {
25        let validComponents = components(separatedBy: String.invalidCharacters)
26        let result = validComponents.joined(separator: "_")
27
28        return result.isEmpty ? "_" : result
29    }
30}
31
32/// Extension methods or properties for NSObject subclasses are invisible from
33/// the Objective-C runtime on static linking unless the consumers add `-ObjC`
34/// linker flag, so let's make a wrapper class to mitigate that situation.
35///
36/// See: https://github.com/Quick/Quick/issues/785 and https://github.com/Quick/Quick/pull/803
37@objc
38class QCKObjCStringUtils: NSObject {
39    override private init() {}
40
41    @objc
42    static func c99ExtendedIdentifier(from string: String) -> String {
43        return string.c99ExtendedIdentifier
44    }
45}
46#endif
47

Source: String+C99ExtendedIdentifier.swift

#if canImport(Darwin)
import Foundation

extension String {
    private static var invalidCharacters: CharacterSet = {
        var invalidCharacters = CharacterSet()

        let invalidCharacterSets: [CharacterSet] = [
            .whitespacesAndNewlines,
            .illegalCharacters,
            .controlCharacters,
            .punctuationCharacters,
            .nonBaseCharacters,
            .symbols
        ]

        for invalidSet in invalidCharacterSets {
            invalidCharacters.formUnion(invalidSet)
        }

        return invalidCharacters
    }()

    internal var c99ExtendedIdentifier: String {
        let validComponents = components(separatedBy: String.invalidCharacters)
        let result = validComponents.joined(separator: "_")

        return result.isEmpty ? "_" : result
    }
}

/// Extension methods or properties for NSObject subclasses are invisible from
/// the Objective-C runtime on static linking unless the consumers add `-ObjC`
/// linker flag, so let's make a wrapper class to mitigate that situation.
///
/// See: https://github.com/Quick/Quick/issues/785 and https://github.com/Quick/Quick/pull/803
@objc
class QCKObjCStringUtils: NSObject {
    override private init() {}

    @objc
    static func c99ExtendedIdentifier(from string: String) -> String {
        return string.c99ExtendedIdentifier
    }
}
#endif

1#if os(macOS) || os(iOS) || os(watchOS) || os(tvOS)
2import Foundation
3
4extension NSString {
5    private static var invalidCharacters: CharacterSet = {
6        var invalidCharacters = CharacterSet()
7
8        let invalidCharacterSets: [CharacterSet] = [
9            .whitespacesAndNewlines,
10            .illegalCharacters,
11            .controlCharacters,
12            .punctuationCharacters,
13            .nonBaseCharacters,
14            .symbols
15        ]
16
17        for invalidSet in invalidCharacterSets {
18            invalidCharacters.formUnion(invalidSet)
19        }
20
21        return invalidCharacters
22    }()
23
24    /// This API is not meant to be used outside Quick, so will be unavaialbe in
25    /// a next major version.
26    @objc(qck_c99ExtendedIdentifier)
27    public var c99ExtendedIdentifier: String {
28        let validComponents = components(separatedBy: NSString.invalidCharacters)
29        let result = validComponents.joined(separator: "_")
30
31        return result.isEmpty ? "_" : result
32    }
33}
34
35/// Extension methods or properties for NSObject subclasses are invisible from
36/// the Objective-C runtime on static linking unless the consumers add `-ObjC`
37/// linker flag, so let's make a wrapper class to mitigate that situation.
38///
39/// See: https://github.com/Quick/Quick/issues/785 and https://github.com/Quick/Quick/pull/803
40@objc
41class QCKObjCStringUtils: NSObject {
42    override private init() {}
43
44    @objc
45    static func c99ExtendedIdentifier(from string: String) -> String {
46        return string.c99ExtendedIdentifier
47    }
48}
49#endif
50

Source: NSString+C99ExtendedIdentifier.swift

#if os(macOS) || os(iOS) || os(watchOS) || os(tvOS)
import Foundation

extension NSString {
    private static var invalidCharacters: CharacterSet = {
        var invalidCharacters = CharacterSet()

        let invalidCharacterSets: [CharacterSet] = [
            .whitespacesAndNewlines,
            .illegalCharacters,
            .controlCharacters,
            .punctuationCharacters,
            .nonBaseCharacters,
            .symbols
        ]

        for invalidSet in invalidCharacterSets {
            invalidCharacters.formUnion(invalidSet)
        }

        return invalidCharacters
    }()

    /// This API is not meant to be used outside Quick, so will be unavaialbe in
    /// a next major version.
    @objc(qck_c99ExtendedIdentifier)
    public var c99ExtendedIdentifier: String {
        let validComponents = components(separatedBy: NSString.invalidCharacters)
        let result = validComponents.joined(separator: "_")

        return result.isEmpty ? "_" : result
    }
}

/// Extension methods or properties for NSObject subclasses are invisible from
/// the Objective-C runtime on static linking unless the consumers add `-ObjC`
/// linker flag, so let's make a wrapper class to mitigate that situation.
///
/// See: https://github.com/Quick/Quick/issues/785 and https://github.com/Quick/Quick/pull/803
@objc
class QCKObjCStringUtils: NSObject {
    override private init() {}

    @objc
    static func c99ExtendedIdentifier(from string: String) -> String {
        return string.c99ExtendedIdentifier
    }
}
#endif