ValueRestriction

What

ValueRestriction is a Swift Package Manager package for iOS/tvOS (10.0 and above), watchOS (4.0 and above), and macOS (10.14 and above), under Swift 5.0 and above, defining an enumeration to easily test a numerical value against some condition:

public enum ValueRestriction<Value> where Value: Comparable {

    case unrestricted

    case equalToOneOf([Value])
    case notEqualToAnyOf([Value])

    case smallerThan(Value)
    case smallerThanOrEqualTo(Value)

    case largerThan(Value)
    case largerThanOrEqualTo(Value)

    case inOpenRange(ClosedRange<Value>)
    case inOpenClosedRange(ClosedRange<Value>)
    case inClosedOpenRange(ClosedRange<Value>)
    case inClosedRange(ClosedRange<Value>)

}

extension ValueRestriction {

    public func applied(to value: Value) -> Value?

    public var isUnrestricted: Bool
    public var argumentOfEqualToOneOf: [Value]?
    public var argumentOfNotEqualToAnyOf: [Value]?
    public var argumentOfSmallerThan: Value?
    public var argumentOfSmallerThanOrEqualTo: Value?
    public var argumentOfLargerThan: Value?
    public var argumentOfLargerThanOrEqualTo: Value?
    public var argumentOfInOpenRange: ClosedRange<Value>?
    public var argumentOfInOpenClosedRange: ClosedRange<Value>?
    public var argumentOfInClosedOpenRange: ClosedRange<Value>?
    public var argumentOfInClosedRange: ClosedRange<Value>?

}

extension ValueRestriction: Equatable where Value: Equatable {}
extension ValueRestriction: Hashable where Value: Hashable {}

extension ValueRestriction: Codable where Value: Codable {

    enum CodingKeys: String, CodingKey, CaseIterable {
        case unrestricted
        case equalToOneOf
        case notEqualToAnyOf
        case smallerThan
        case smallerThanOrEqualTo
        case largerThan
        case largerThanOrEqualTo
        case inOpenRange
        case inOpenClosedRange
        case inClosedOpenRange
        case inClosedRange
    }

    public func encode(to encoder: Encoder) throws 
    public init(from decoder: Decoder) throws 

}

Installation

ValueRestriction is provided only as a Swift Package Manager package, because I'm moving away from CocoaPods and Carthage, and can be easily installed directly from Xcode.

License

ValueRestriction is available under the MIT license. See the LICENSE file for more info.