48 lines
2.9 KiB
Swift
48 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, threadID: String) -> String {
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return highlightMentions(in: string, isOutgoingMessage: false, threadID: threadID, 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, threadID: String, attributes: [NSAttributedString.Key:Any]) -> NSAttributedString {
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let openGroupV2 = Storage.shared.getV2OpenGroup(for: threadID)
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OWSPrimaryStorage.shared().dbReadConnection.read { transaction in
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MentionsManager.populateUserPublicKeyCacheIfNeeded(for: threadID, in: transaction)
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}
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var string = string
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let regex = try! NSRegularExpression(pattern: "@[0-9a-fA-F]{66}", options: [])
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let knownPublicKeys = MentionsManager.userPublicKeyCache[threadID] ?? [] // Should always be populated at this point
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var mentions: [(range: NSRange, publicKey: String)] = []
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var outerMatch = regex.firstMatch(in: string, options: .withoutAnchoringBounds, range: NSRange(location: 0, length: string.utf16.count))
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while let match = outerMatch {
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let publicKey = String((string as NSString).substring(with: match.range).dropFirst()) // Drop the @
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let matchEnd: Int
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if knownPublicKeys.contains(publicKey) {
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let context: Contact.Context = (openGroupV2 != nil) ? .openGroup : .regular
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let displayName = Storage.shared.getContact(with: publicKey)?.displayName(for: context)
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if let displayName = displayName {
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string = (string as NSString).replacingCharacters(in: match.range, with: "@\(displayName)")
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mentions.append((range: NSRange(location: match.range.location, length: displayName.utf16.count + 1), publicKey: publicKey)) // + 1 to include the @
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matchEnd = match.range.location + displayName.utf16.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.utf16.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 = isOutgoingMessage ? (isLightMode ? .white : .black) : Colors.accent
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result.addAttribute(.foregroundColor, value: color, range: mention.range)
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result.addAttribute(.font, value: UIFont.boldSystemFont(ofSize: Values.smallFontSize), range: mention.range)
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}
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return result
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}
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}
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