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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2025 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
//
//===----------------------------------------------------------------------===//
/// A wrapper for a dictionary that stores the transitively enabled traits for each package.
public struct EnabledTraitsMap: ExpressibleByDictionaryLiteral {
public typealias Key = PackageIdentity
public typealias Value = Set<String>
var storage: [PackageIdentity: Set<String>] = [:]
public init() { }
public init(dictionaryLiteral elements: (Key, Value)...) {
for (key, value) in elements {
storage[key] = value
}
}
public init(_ dictionary: [Key: Value]) {
self.storage = dictionary
}
public subscript(key: PackageIdentity) -> Set<String> {
get { storage[key] ?? ["default"] }
set {
// Omit adding "default" explicitly, since the map returns "default"
// if there is no explicit traits declared. This will allow us to check
// for nil entries in the stored dictionary, which tells us whether
// traits have been explicitly declared.
guard newValue != ["default"] else { return }
if storage[key] == nil {
storage[key] = newValue
} else {
storage[key]?.formUnion(newValue)
}
}
}
public subscript(explicitlyEnabledTraitsFor key: PackageIdentity) -> Set<String>? {
get { storage[key] }
}
public var dictionaryLiteral: [PackageIdentity: Set<String>] {
return storage
}
}
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