Move WeakDictionary to the Vendor folder and clarify where it comes from and under what license

ElementX/Sources/Other/WeakDictionary/WeakDictionary.swift

@@ -1,102 +0,0 @@
-//
-//  WeakDictionary.swift
-//  WeakDictionary
-//
-//  Created by Nicholas Cross on 19/10/2016.
-//  Copyright © 2016 Nicholas Cross. All rights reserved.
-//
-
-import Foundation
-
-public struct WeakDictionary<Key: Hashable, Value: AnyObject> {
-    private var storage: [Key: WeakDictionaryReference<Value>]
-
-    public init() {
-        self.init(storage: [Key: WeakDictionaryReference<Value>]())
-    }
-
-    public init(dictionary: [Key: Value]) {
-        var newStorage = [Key: WeakDictionaryReference<Value>]()
-        dictionary.forEach { key, value in newStorage[key] = WeakDictionaryReference<Value>(value: value) }
-        self.init(storage: newStorage)
-    }
-
-    private init(storage: [Key: WeakDictionaryReference<Value>]) {
-        self.storage = storage
-    }
-
-    public mutating func reap() {
-        storage = weakDictionary().storage
-    }
-
-    public func weakDictionary() -> WeakDictionary<Key, Value> {
-        self[startIndex..<endIndex]
-    }
-
-    public func dictionary() -> [Key: Value] {
-        var newStorage = [Key: Value]()
-
-        storage.forEach { key, value in
-            if let retainedValue = value.value {
-                newStorage[key] = retainedValue
-            }
-        }
-
-        return newStorage
-    }
-}
-
-extension WeakDictionary: Collection {
-    public typealias Index = DictionaryIndex<Key, WeakDictionaryReference<Value>>
-
-    public var startIndex: Index {
-        storage.startIndex
-    }
-
-    public var endIndex: Index {
-        storage.endIndex
-    }
-
-    public func index(after index: Index) -> Index {
-        storage.index(after: index)
-    }
-
-    public subscript(position: Index) -> (Key, WeakDictionaryReference<Value>) {
-        return storage[position]
-    }
-
-    public subscript(key: Key) -> Value? {
-        get {
-            guard let valueRef = storage[key] else {
-                return nil
-            }
-
-            return valueRef.value
-        }
-
-        set {
-            guard let value = newValue else {
-                storage[key] = nil
-                return
-            }
-
-            storage[key] = WeakDictionaryReference<Value>(value: value)
-        }
-    }
-
-    public subscript(bounds: Range<Index>) -> WeakDictionary<Key, Value> {
-        let subStorage = storage[bounds.lowerBound..<bounds.upperBound]
-        var newStorage = [Key: WeakDictionaryReference<Value>]()
-
-        subStorage.filter { _, value in value.value != nil }
-            .forEach { key, value in newStorage[key] = value }
-
-        return WeakDictionary<Key, Value>(storage: newStorage)
-    }
-}
-
-public extension Dictionary where Value: AnyObject {
-    func weakDictionary() -> WeakDictionary<Key, Value> {
-        WeakDictionary<Key, Value>(dictionary: self)
-    }
-}

ElementX/Sources/Other/WeakDictionary/WeakDictionaryKeyReference.swift

@@ -1,39 +0,0 @@
-//
-//  WeakDictionaryKeyReference.swift
-//  WeakDictionary-iOS
-//
-//  Created by Nicholas Cross on 2/1/19.
-//  Copyright © 2019 Nicholas Cross. All rights reserved.
-//
-
-import Foundation
-
-public struct WeakDictionaryKey<Key: AnyObject & Hashable, Value: AnyObject>: Hashable {
-    private weak var baseKey: Key?
-    private let hash: Int
-    private var retainedValue: Value?
-    private let nilKeyHash = UUID().hashValue
-
-    public init(key: Key, value: Value? = nil) {
-        baseKey = key
-        retainedValue = value
-        hash = key.hashValue
-    }
-
-    public static func == (lhs: WeakDictionaryKey, rhs: WeakDictionaryKey) -> Bool {
-        (lhs.baseKey != nil && rhs.baseKey != nil && lhs.baseKey == rhs.baseKey)
-            || lhs.hashValue == rhs.hashValue
-    }
-
-    public func hash(into hasher: inout Hasher) {
-        if baseKey == nil {
-            hasher.combine(nilKeyHash)
-        } else {
-            hasher.combine(baseKey)
-        }
-    }
-
-    public var key: Key? {
-        baseKey
-    }
-}

ElementX/Sources/Other/WeakDictionary/WeakDictionaryReference.swift

@@ -1,21 +0,0 @@
-//
-//  WeakDictionaryReference.swift
-//  WeakDictionary-iOS
-//
-//  Created by Nicholas Cross on 2/1/19.
-//  Copyright © 2019 Nicholas Cross. All rights reserved.
-//
-
-import Foundation
-
-public struct WeakDictionaryReference<Value: AnyObject> {
-    private weak var referencedValue: Value?
-
-    init(value: Value) {
-        referencedValue = value
-    }
-
-    public var value: Value? {
-        referencedValue
-    }
-}

ElementX/Sources/Other/WeakDictionary/WeakKeyDictionary.swift

@@ -1,122 +0,0 @@
-//
-//  WeakKeyDictionary.swift
-//  WeakDictionary-iOS
-//
-//  Created by Nicholas Cross on 2/1/19.
-//  Copyright © 2019 Nicholas Cross. All rights reserved.
-//
-
-import Foundation
-
-public struct WeakKeyDictionary<Key: AnyObject & Hashable, Value: AnyObject> {
-    private var storage: WeakDictionary<WeakDictionaryKey<Key, Value>, Value>
-    private let valuesRetainedByKey: Bool
-
-    public init(valuesRetainedByKey: Bool = false) {
-        self.init(
-            storage: WeakDictionary<WeakDictionaryKey<Key, Value>, Value>(),
-            valuesRetainedByKey: valuesRetainedByKey
-        )
-    }
-
-    public init(dictionary: [Key: Value], valuesRetainedByKey: Bool = false) {
-        var newStorage = WeakDictionary<WeakDictionaryKey<Key, Value>, Value>()
-
-        dictionary.forEach { key, value in
-            var keyRef: WeakDictionaryKey<Key, Value>!
-
-            if valuesRetainedByKey {
-                keyRef = WeakDictionaryKey<Key, Value>(key: key, value: value)
-            } else {
-                keyRef = WeakDictionaryKey<Key, Value>(key: key)
-            }
-
-            newStorage[keyRef] = value
-        }
-
-        self.init(storage: newStorage, valuesRetainedByKey: valuesRetainedByKey)
-    }
-
-    private init(storage: WeakDictionary<WeakDictionaryKey<Key, Value>, Value>, valuesRetainedByKey: Bool = false) {
-        self.storage = storage
-        self.valuesRetainedByKey = valuesRetainedByKey
-    }
-
-    public mutating func reap() {
-        storage = weakKeyDictionary().storage
-    }
-
-    public func weakDictionary() -> WeakDictionary<Key, Value> {
-        dictionary().weakDictionary()
-    }
-
-    public func weakKeyDictionary() -> WeakKeyDictionary<Key, Value> {
-        self[startIndex..<endIndex]
-    }
-
-    public func dictionary() -> [Key: Value] {
-        var newStorage = [Key: Value]()
-
-        storage.forEach { key, value in
-            if let retainedKey = key.key, let retainedValue = value.value {
-                newStorage[retainedKey] = retainedValue
-            }
-        }
-
-        return newStorage
-    }
-}
-
-extension WeakKeyDictionary: Collection {
-    public typealias Index = DictionaryIndex<WeakDictionaryKey<Key, Value>, WeakDictionaryReference<Value>>
-
-    public var startIndex: Index {
-        storage.startIndex
-    }
-
-    public var endIndex: Index {
-        storage.endIndex
-    }
-
-    public func index(after index: Index) -> Index {
-        storage.index(after: index)
-    }
-
-    public subscript(position: Index) -> (WeakDictionaryKey<Key, Value>, WeakDictionaryReference<Value>) {
-        return storage[position]
-    }
-
-    public subscript(key: Key) -> Value? {
-        get {
-            storage[WeakDictionaryKey<Key, Value>(key: key)]
-        }
-
-        set {
-            let retainedValue = valuesRetainedByKey ? newValue : nil
-            let weakKey = WeakDictionaryKey<Key, Value>(key: key, value: retainedValue)
-            storage[weakKey] = newValue
-        }
-    }
-
-    public subscript(bounds: Range<Index>) -> WeakKeyDictionary<Key, Value> {
-        let subStorage = storage[bounds.lowerBound..<bounds.upperBound]
-        var newStorage = WeakDictionary<WeakDictionaryKey<Key, Value>, Value>()
-
-        subStorage.filter { key, value in key.key != nil && value.value != nil }
-            .forEach { key, value in newStorage[key] = value.value }
-
-        return WeakKeyDictionary<Key, Value>(storage: newStorage)
-    }
-}
-
-public extension WeakDictionary where Key: AnyObject {
-    func weakKeyDictionary(valuesRetainedByKey: Bool = false) -> WeakKeyDictionary<Key, Value> {
-        WeakKeyDictionary<Key, Value>(dictionary: dictionary(), valuesRetainedByKey: valuesRetainedByKey)
-    }
-}
-
-public extension Dictionary where Key: AnyObject, Value: AnyObject {
-    func weakKeyDictionary(valuesRetainedByKey: Bool = false) -> WeakKeyDictionary<Key, Value> {
-        WeakKeyDictionary<Key, Value>(dictionary: self, valuesRetainedByKey: valuesRetainedByKey)
-    }
-}