67 lines
2.6 KiB
Swift
67 lines
2.6 KiB
Swift
// Copyright © 2022 Rangeproof Pty Ltd. All rights reserved.
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//
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// stringlint:disable
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import Foundation
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public extension NSAttributedString {
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static func with(_ attrStrings: [NSAttributedString]) -> NSAttributedString {
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let mutableString: NSMutableAttributedString = NSMutableAttributedString()
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for attrString in attrStrings {
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mutableString.append(attrString)
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}
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return mutableString
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}
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func appending(_ attrString: NSAttributedString) -> NSAttributedString {
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let mutableString: NSMutableAttributedString = NSMutableAttributedString(attributedString: self)
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mutableString.append(attrString)
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return mutableString
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}
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func appending(string: String, attributes: [Key: Any]? = nil) -> NSAttributedString {
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return appending(NSAttributedString(string: string, attributes: attributes))
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}
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func adding(attributes: [Key: Any], range: NSRange) -> NSAttributedString {
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let mutableString: NSMutableAttributedString = NSMutableAttributedString(attributedString: self)
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mutableString.addAttributes(attributes, range: range)
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return mutableString
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}
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// The actual Swift implementation of 'uppercased' is pretty nuts (see
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// https://github.com/apple/swift/blob/main/stdlib/public/core/String.swift#L901)
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// this approach is definitely less efficient but is much simpler and less likely to break
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private enum CharacterCasing {
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static let map: [UTF16.CodeUnit: String.UTF16View] = [
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"a": "A", "b": "B", "c": "C", "d": "D", "e": "E", "f": "F", "g": "G",
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"h": "H", "i": "I", "j": "J", "k": "K", "l": "L", "m": "M", "n": "N",
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"o": "O", "p": "P", "q": "Q", "r": "R", "s": "S", "t": "T", "u": "U",
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"v": "V", "w": "W", "x": "X", "y": "Y", "z": "Z"
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]
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.reduce(into: [:]) { prev, next in
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prev[next.key.utf16.first ?? UTF16.CodeUnit()] = next.value.utf16
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}
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}
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func uppercased() -> NSAttributedString {
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let result = NSMutableAttributedString(attributedString: self)
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let uppercasedCharacters = result.string.utf16.map { utf16Char in
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// Try convert the individual utf16 character to it's uppercase variant
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// or fallback to the original character
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(CharacterCasing.map[utf16Char]?.first ?? utf16Char)
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}
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result.replaceCharacters(
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in: NSRange(location: 0, length: length),
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with: String(utf16CodeUnits: uppercasedCharacters, count: length)
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)
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return result
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}
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}
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