50 lines
2.9 KiB
Swift
50 lines
2.9 KiB
Swift
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@objc(LKMentionUtilities)
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public final class MentionUtilities : NSObject {
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override private init() { }
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@objc public static func highlightMentions(in string: String, thread: TSThread) -> String {
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return highlightMentions(in: string, isOutgoingMessage: false, thread: thread, attributes: [:]).string // isOutgoingMessage and attributes are irrelevant
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}
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@objc public static func highlightMentions(in string: String, isOutgoingMessage: Bool, thread: TSThread, attributes: [NSAttributedString.Key:Any]) -> NSAttributedString {
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var string = string
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let regex = try! NSRegularExpression(pattern: "@[0-9a-fA-F]*", options: [])
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let knownUserIDs = LokiAPI.userIDCache[thread.uniqueId!] ?? [] // Should always be populated at this point
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var mentions: [NSRange] = []
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var outerMatch = regex.firstMatch(in: string, options: .withoutAnchoringBounds, range: NSRange(location: 0, length: string.count))
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while let match = outerMatch, thread.isGroupThread() {
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let userID = String((string as NSString).substring(with: match.range).dropFirst()) // Drop the @
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let matchEnd: Int
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if knownUserIDs.contains(userID) {
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var userDisplayName: String?
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if userID == OWSIdentityManager.shared().identityKeyPair()!.hexEncodedPublicKey {
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userDisplayName = OWSProfileManager.shared().localProfileName()
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} else {
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OWSPrimaryStorage.shared().dbReadConnection.read { transaction in
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let collection = "\(LokiGroupChatAPI.publicChatServer).\(LokiGroupChatAPI.publicChatServerID)"
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userDisplayName = transaction.object(forKey: userID, inCollection: collection) as! String?
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}
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}
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if let userDisplayName = userDisplayName {
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string = (string as NSString).replacingCharacters(in: match.range, with: "@\(userDisplayName)")
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mentions.append(NSRange(location: match.range.location, length: userDisplayName.count + 1)) // + 1 to include the @
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matchEnd = match.range.location + userDisplayName.count
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} else {
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matchEnd = match.range.location + match.range.length
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}
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} else {
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matchEnd = match.range.location + match.range.length
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}
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outerMatch = regex.firstMatch(in: string, options: .withoutAnchoringBounds, range: NSRange(location: matchEnd, length: string.count - matchEnd))
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}
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let result = NSMutableAttributedString(string: string, attributes: attributes)
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mentions.forEach { mention in
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let color: UIColor = isOutgoingMessage ? .lokiDarkGray() : .lokiGreen()
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result.addAttribute(.backgroundColor, value: color, range: mention)
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}
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return result
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}
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}
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