forked from shadowfacts/Tusker
36 lines
1.3 KiB
Swift
36 lines
1.3 KiB
Swift
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// CharacterCounter.swift
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// Pachyderm
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//
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// Created by Shadowfacts on 9/29/18.
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// Copyright © 2018 Shadowfacts. All rights reserved.
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//
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import Foundation
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public struct CharacterCounter {
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static let linkDetector = try! NSDataDetector(types: NSTextCheckingResult.CheckingType.link.rawValue)
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static let mention = try! NSRegularExpression(pattern: "(@[a-z0-9_]+)(?:@[a-z0-9\\-\\.]+[a-z0-9]+)?", options: .caseInsensitive)
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public static func count(text: String) -> Int {
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let mentionsRemoved = removeMentions(in: text)
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var count = mentionsRemoved.count
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for match in linkDetector.matches(in: mentionsRemoved, options: [], range: NSRange(location: 0, length: mentionsRemoved.utf16.count)) {
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count -= match.range.length
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count += 23 // Mastodon link length
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}
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return count
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}
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private static func removeMentions(in text: String) -> String {
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var mut = text
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for match in mention.matches(in: mut, options: [], range: NSRange(location: 0, length: mut.utf16.count)).reversed() {
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let replacement = mut[Range(match.range(at: 1), in: mut)!]
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mut.replaceSubrange(Range(match.range, in: mut)!, with: replacement)
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}
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return mut
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}
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}
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