PlatformRegistry.swift

//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift open source project
//
// Copyright (c) 2018 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See http://swift.org/LICENSE.txt for license information
// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//

/// A registry for available platforms.
public final class PlatformRegistry {

    /// The current registry is hardcoded and static so we can just use
    /// a singleton for now.
    public static let `default`: PlatformRegistry = .init()

    /// The list of known platforms.
    public let knownPlatforms: [Platform]

    /// The mapping of platforms to their name.
    public let platformByName: [String: Platform]

    /// Create a registry with the given list of platforms.
    init(platforms: [Platform] = PlatformRegistry._knownPlatforms) {
        self.knownPlatforms = platforms
        self.platformByName = Dictionary(uniqueKeysWithValues: knownPlatforms.map({ ($0.name, $0) }))
    }

    /// The static list of known platforms.
    private static var _knownPlatforms: [Platform] {
        return [.macOS, .macCatalyst, .iOS, .tvOS, .watchOS, .visionOS, .linux, .windows, .android, .wasi, .driverKit, .openbsd]
    }
}