mastodon-ios/Mastodon/Extension/Array.swift

100 lines
2.7 KiB
Swift

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