100 lines
2.7 KiB
Swift
100 lines
2.7 KiB
Swift
//
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// Array.swift
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// Mastodon
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//
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// Created by BradGao on 2021/3/31.
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//
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import Foundation
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/// https://www.hackingwithswift.com/example-code/language/how-to-remove-duplicate-items-from-an-array
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extension Array where Element: Hashable {
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func removingDuplicates() -> [Element] {
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var addedDict = [Element: Bool]()
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return filter {
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addedDict.updateValue(true, forKey: $0) == nil
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}
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}
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mutating func removeDuplicates() {
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self = self.removingDuplicates()
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}
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}
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//
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// CryptoSwift
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//
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// Copyright (C) 2014-2017 Marcin Krzyżanowski <marcin@krzyzanowskim.com>
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// This software is provided 'as-is', without any express or implied warranty.
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//
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// In no event will the authors be held liable for any damages arising from the use of this software.
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//
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// Permission is granted to anyone to use this software for any purpose,including commercial applications, and to alter it and redistribute it freely, subject to the following restrictions:
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//
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// - The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation is required.
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// - Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
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// - This notice may not be removed or altered from any source or binary distribution.
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//
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extension Array {
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init(reserveCapacity: Int) {
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self = Array<Element>()
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self.reserveCapacity(reserveCapacity)
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}
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var slice: ArraySlice<Element> {
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self[self.startIndex ..< self.endIndex]
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}
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}
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extension Array where Element == UInt8 {
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public init(hex: String) {
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self.init(reserveCapacity: hex.unicodeScalars.lazy.underestimatedCount)
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var buffer: UInt8?
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var skip = hex.hasPrefix("0x") ? 2 : 0
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for char in hex.unicodeScalars.lazy {
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guard skip == 0 else {
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skip -= 1
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continue
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}
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guard char.value >= 48 && char.value <= 102 else {
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removeAll()
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return
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}
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let v: UInt8
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let c: UInt8 = UInt8(char.value)
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switch c {
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case let c where c <= 57:
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v = c - 48
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case let c where c >= 65 && c <= 70:
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v = c - 55
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case let c where c >= 97:
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v = c - 87
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default:
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removeAll()
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return
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}
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if let b = buffer {
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append(b << 4 | v)
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buffer = nil
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} else {
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buffer = v
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}
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}
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if let b = buffer {
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append(b)
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}
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}
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public func toHexString() -> String {
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`lazy`.reduce(into: "") {
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var s = String($1, radix: 16)
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if s.count == 1 {
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s = "0" + s
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}
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$0 += s
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}
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}
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}
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