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Cistem.swift
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Cistem.swift
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//
// cistem.swift
// cistem
//
// Created by Hendrik Noeller on 15.09.17.
// Copyright © 2017 de.HendrikNoeller. All rights reserved.
//
import Foundation
extension String {
func index(_ index:Int) -> String.Index{
if (index < 0) {
return self.index(self.endIndex, offsetBy: index)
} else {
return self.index(self.startIndex, offsetBy: index)
}
}
}
struct Cistem {
static let doubleCharacterRegex = try! NSRegularExpression(pattern: "(.)\\1")
static let doubleCharacterReverseRegex = try! NSRegularExpression(pattern: "(.)\\*")
private static func isUppercase(_ word: String) -> Bool {
let first = String(word[word.startIndex])
let firstUpper = first.uppercased()
return first == firstUpper
}
static func stem(_ word: String, caseInsensitive: Bool = false) -> String {
if (word.isEmpty) {
return ""
}
let uppercase = isUppercase(word)
var result = word
result = result.lowercased()
result = result.replacingOccurrences(of: "ü", with: "u")
result = result.replacingOccurrences(of: "ö", with: "o")
result = result.replacingOccurrences(of: "ä", with: "a")
result = result.replacingOccurrences(of: "ß", with: "ss")
if (result.characters.count >= 6 && result.hasPrefix("ge")) {
result = result[result.index(2)..<result.endIndex]
}
result = result.replacingOccurrences(of: "sch", with: "$")
result = result.replacingOccurrences(of: "ei", with: "%")
result = result.replacingOccurrences(of: "ie", with: "&")
result = doubleCharacterRegex.stringByReplacingMatches(in: result, options: [], range: NSMakeRange(0, result.characters.count), withTemplate: "$1*")
while (result.characters.count > 3) {
if (result.characters.count > 5) {
if (result.hasSuffix("em") || result.hasSuffix("er") || result.hasSuffix("nd")){
result = result[result.startIndex..<result.index(-2)]
continue
}
}
if (!uppercase || caseInsensitive) {
if (result.hasSuffix("t")) {
result = result[result.startIndex..<result.index(-1)]
continue
}
}
if (result.hasSuffix("e") || result.hasSuffix("s") || result.hasSuffix("n")) {
result = result[result.startIndex..<result.index(-1)]
continue
}
break
}
result = doubleCharacterReverseRegex.stringByReplacingMatches(in: result, options: [], range: NSMakeRange(0, result.characters.count), withTemplate: "$1$1")
result = result.replacingOccurrences(of: "$", with: "sch")
result = result.replacingOccurrences(of: "%", with: "ei")
result = result.replacingOccurrences(of: "&", with: "ie")
return result
}
static func segment(_ word: String, caseInsensitive: Bool = false) -> [String] {
if (word.isEmpty) {
return ["", ""]
}
let uppercase = isUppercase(word)
var restLength = 0
var result = word
result = result.lowercased()
let original = result
result = result.replacingOccurrences(of: "sch", with: "$")
result = result.replacingOccurrences(of: "ei", with: "%")
result = result.replacingOccurrences(of: "ie", with: "&")
result = doubleCharacterRegex.stringByReplacingMatches(in: result, options: [], range: NSMakeRange(0, result.characters.count), withTemplate: "$1*")
while (result.characters.count > 3) {
if (result.characters.count > 5) {
if (result.hasSuffix("em") || result.hasSuffix("er") || result.hasSuffix("nd")){
restLength += 2
result = result[result.startIndex..<result.index(-2)]
continue
}
}
if (!uppercase || caseInsensitive) {
if (result.hasSuffix("t")) {
restLength += 1
result = result[result.startIndex..<result.index(-1)]
continue
}
}
if (result.hasSuffix("e") || result.hasSuffix("s") || result.hasSuffix("n")) {
restLength += 1
result = result[result.startIndex..<result.index(-1)]
continue
}
break
}
result = doubleCharacterReverseRegex.stringByReplacingMatches(in: result, options: [], range: NSMakeRange(0, result.characters.count), withTemplate: "$1$1")
result = result.replacingOccurrences(of: "$", with: "sch")
result = result.replacingOccurrences(of: "%", with: "ei")
result = result.replacingOccurrences(of: "&", with: "ie")
var rest = ""
if (restLength > 0) {
rest = String(original[original.index(-restLength)..<original.endIndex])
}
return [result, rest]
}
}