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mastodon-app-ufficiale-ipho.../MastodonSDK/Sources/MastodonUI/Extension/NSAttributedString+Format.swift

48 lines
1.8 KiB
Swift

// Copyright © 2023 Mastodon gGmbH. All rights reserved.
import Foundation
public extension NSAttributedString {
convenience init(format: NSAttributedString, args: NSAttributedString...) {
let mutableNSAttributedString = NSMutableAttributedString(attributedString: format)
zip(format.string.ranges(of: "%@"), Array(args)).forEach { range, arg in
mutableNSAttributedString.replaceCharacters(in: .init(range: range, originalText: format.string), with: arg)
}
self.init(attributedString: mutableNSAttributedString)
}
}
private extension String {
func ranges(of searchString: String) -> [Range<String.Index>] {
let indices = indices(of: searchString)
let count = searchString.count
return indices.map({ index(startIndex, offsetBy: $0)..<index(startIndex, offsetBy: $0+count) })
}
func indices(of occurrence: String) -> [Int] {
var indices = [Int]()
var position = startIndex
while let range = range(of: occurrence, range: position..<endIndex) {
let i = distance(from: startIndex, to: range.lowerBound)
indices.append(i)
let offset = occurrence.distance(from: occurrence.startIndex, to: occurrence.endIndex) - 1
guard let after = index(range.lowerBound, offsetBy: offset, limitedBy: endIndex) else {
break
}
position = index(after: after)
}
return indices
}
}
private extension NSRange {
init(range: Range<String.Index>, originalText: String) {
self.init(
location: range.lowerBound.utf16Offset(in: originalText),
length: range.upperBound.utf16Offset(in: originalText) - range.lowerBound.utf16Offset(in: originalText)
)
}
}