iOS NLP fail.swift

import Foundation


let options = NSLinguisticTagger.Options.omitWhitespace.rawValue | NSLinguisticTagger.Options.joinNames.rawValue
let tagger = NSLinguisticTagger(tagSchemes: NSLinguisticTagger.availableTagSchemes(forLanguage: "en"), options: Int(options))

//let str = "Can a cat eat?"
//[Can:Other, a:Other, cat:Other, eat:Other, ?:SentenceTerminator]

//let str = "Can a human swim?"
//[Can:Verb, a:Determiner, human:Adjective, swim:Noun, ?:SentenceTerminator]

//let str = "Cat food tastes great"
//[Cat:Noun, food:Noun, tastes:Noun, great:Adjective]

let str = "Meet men today!"
//[Meet:Noun, men:Noun, today:Noun, !:SentenceTerminator]


tagger.string = str

struct TaggedString: CustomStringConvertible {
    var str: String
    var pos: String
    var description: String {
        return "\(str):\(pos)"
    }
}

var taggedStrings = [TaggedString]()
let range = NSRange(location: 0, length: str.utf16.count)
tagger.enumerateTags(in: range, scheme: .nameTypeOrLexicalClass, options: NSLinguisticTagger.Options(rawValue: options)) { weakPOS, tokenRange, _, _ in
    
    guard let range = Range(tokenRange, in: str),
        let pos = weakPOS else {
        return
    }
    let token = String(str[range])
    taggedStrings.append(TaggedString(str:token, pos:pos.rawValue))
}

print(taggedStrings)