75 lines
2.1 KiB
Swift
75 lines
2.1 KiB
Swift
//
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// SwiftDate
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// Parse, validate, manipulate, and display dates, time and timezones in Swift
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//
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// Created by Daniele Margutti
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// - Web: https://www.danielemargutti.com
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// - Twitter: https://twitter.com/danielemargutti
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// - Mail: hello@danielemargutti.com
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//
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// Copyright © 2019 Daniele Margutti. Licensed under MIT License.
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//
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#if os(Linux)
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#else
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import Foundation
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import ObjectiveC.runtime
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internal func getAssociatedValue<T>(key: String, object: AnyObject) -> T? {
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return (objc_getAssociatedObject(object, key.address) as? AssociatedValue)?.value as? T
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}
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internal func getAssociatedValue<T>(key: String, object: AnyObject, initialValue: @autoclosure () -> T) -> T {
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return getAssociatedValue(key: key, object: object) ?? setAndReturn(initialValue: initialValue(), key: key, object: object)
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}
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internal func getAssociatedValue<T>(key: String, object: AnyObject, initialValue: () -> T) -> T {
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return getAssociatedValue(key: key, object: object) ?? setAndReturn(initialValue: initialValue(), key: key, object: object)
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}
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private func setAndReturn<T>(initialValue: T, key: String, object: AnyObject) -> T {
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set(associatedValue: initialValue, key: key, object: object)
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return initialValue
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}
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internal func set<T>(associatedValue: T?, key: String, object: AnyObject) {
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set(associatedValue: AssociatedValue(associatedValue), key: key, object: object)
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}
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internal func set<T: AnyObject>(weakAssociatedValue: T?, key: String, object: AnyObject) {
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set(associatedValue: AssociatedValue(weak: weakAssociatedValue), key: key, object: object)
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}
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extension String {
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fileprivate var address: UnsafeRawPointer {
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return UnsafeRawPointer(bitPattern: abs(hashValue))!
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}
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}
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private func set(associatedValue: AssociatedValue, key: String, object: AnyObject) {
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objc_setAssociatedObject(object, key.address, associatedValue, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
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}
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private class AssociatedValue {
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weak var _weakValue: AnyObject?
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var _value: Any?
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var value: Any? {
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return _weakValue ?? _value
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}
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init(_ value: Any?) {
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_value = value
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}
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init(weak: AnyObject?) {
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_weakValue = weak
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}
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}
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#endif
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