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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2023 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
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
/// Describes a version such as `5.9`.
public struct VersionTuple: Sendable {
/// The components of the version tuple, start with the major version.
public var components: [Int]
/// Create a version tuple from a non-empty array of components.
public init(components: [Int]) {
precondition(!components.isEmpty)
self.components = components
}
/// Create a version tuple from its components.
public init(_ firstComponent: Int, _ remainingComponents: Int...) {
self.components = []
self.components.append(firstComponent)
self.components.append(contentsOf: remainingComponents)
}
/// Parse a string into a version tuple, returning `nil` if any errors were
/// present.
public init?(parsing string: String) {
self.components = []
for componentText in string.split(separator: ".", omittingEmptySubsequences: false) {
guard let component = Int(componentText) else {
return nil
}
components.append(component)
}
if components.isEmpty { return nil }
}
/// Normalize the version tuple by removing trailing zeroes.
var normalized: VersionTuple {
var newComponents = components
while newComponents.count > 1 && newComponents.last == 0 {
newComponents.removeLast()
}
return VersionTuple(components: newComponents)
}
}
extension VersionTuple: Equatable, Hashable {}
extension VersionTuple: Comparable {
public static func < (lhs: VersionTuple, rhs: VersionTuple) -> Bool {
return lhs.normalized.components.lexicographicallyPrecedes(rhs.normalized.components)
}
}
extension VersionTuple: CustomStringConvertible {
public var description: String {
return components.map { String($0) }.joined(separator: ".")
}
}
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