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//===----------------------------------------------------------*- swift -*-===//
//
// This source file is part of the Swift Argument Parser open source project
//
// Copyright (c) 2020 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
//
//===----------------------------------------------------------------------===//
/// A type that can be expressed as a command-line argument.
public protocol ExpressibleByArgument {
/// Creates a new instance of this type from a command-line-specified
/// argument.
init?(argument: String)
/// The description of this instance to show as a default value in a
/// command-line tool's help screen.
var defaultValueDescription: String { get }
/// An array of all possible strings that can convert to a value of this
/// type.
///
/// The default implementation of this property returns an empty array.
static var allValueStrings: [String] { get }
/// The completion kind to use for options or arguments of this type that
/// don't explicitly declare a completion kind.
///
/// The default implementation of this property returns `.default`.
static var defaultCompletionKind: CompletionKind { get }
}
extension ExpressibleByArgument {
public var defaultValueDescription: String {
"\(self)"
}
public static var allValueStrings: [String] { [] }
public static var defaultCompletionKind: CompletionKind {
.default
}
}
extension ExpressibleByArgument where Self: CaseIterable {
public static var allValueStrings: [String] {
self.allCases.map { String(describing: $0) }
}
public static var defaultCompletionKind: CompletionKind {
.list(allValueStrings)
}
}
extension ExpressibleByArgument where Self: CaseIterable, Self: RawRepresentable, RawValue: ExpressibleByArgument {
public static var allValueStrings: [String] {
self.allCases.map(\.rawValue.defaultValueDescription)
}
}
extension ExpressibleByArgument where Self: RawRepresentable, RawValue: ExpressibleByArgument {
public var defaultValueDescription: String {
rawValue.defaultValueDescription
}
}
extension String: ExpressibleByArgument {
public init?(argument: String) {
self = argument
}
}
extension RawRepresentable where Self: ExpressibleByArgument, RawValue: ExpressibleByArgument {
public init?(argument: String) {
if let value = RawValue(argument: argument) {
self.init(rawValue: value)
} else {
return nil
}
}
}
// MARK: LosslessStringConvertible
extension LosslessStringConvertible where Self: ExpressibleByArgument {
public init?(argument: String) {
self.init(argument)
}
}
extension Int: ExpressibleByArgument {}
extension Int8: ExpressibleByArgument {}
extension Int16: ExpressibleByArgument {}
extension Int32: ExpressibleByArgument {}
extension Int64: ExpressibleByArgument {}
extension UInt: ExpressibleByArgument {}
extension UInt8: ExpressibleByArgument {}
extension UInt16: ExpressibleByArgument {}
extension UInt32: ExpressibleByArgument {}
extension UInt64: ExpressibleByArgument {}
extension Float: ExpressibleByArgument {}
extension Double: ExpressibleByArgument {}
extension Bool: ExpressibleByArgument {}
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