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+//
+//  SwiftyLevenshtein.swift
+//  Levenshtein distance algorithm written in Swift 2.2. Both a slow and highly optimized version are included.
+//
+//  Created by Mark Hamilton on 3/31/16.
+//  Copyright © 2016 dryverless. (http://www.dryverless.com)
+// 
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+// 
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+// 
+
+import Foundation
+
+// Minimize 3
+public func min3(a: Int, b: Int, c: Int) -> Int {
+
+    return min( min(a, c), min(b, c))
+
+}
+
+// In case they ever let subscripts throw
+//public extension String {
+//    
+//    internal enum SubscriptError: ErrorType {
+//        
+//        case InvalidFirstChar
+//        
+//        case InvalidLastChar
+//        
+//    }
+//
+//
+//    subscript(range: Range<Int>) throws -> String {
+//        
+//        guard let firstChar = startIndex.advancedBy(range.startIndex) else {
+//    
+//            throw SubscriptError.InvalidFirstChar
+//        }
+//    
+//        guard  let lastChar = startIndex.advancedBy(range.endIndex) else {
+//    
+//            throw SubscriptError.InvalidLastChar
+//    
+//        }
+//    
+//        return self[firstChar...<lastChar]
+//        
+//        
+//    }
+//
+//}
+
+public extension String {
+    
+    subscript(index: Int) -> Character {
+        
+        return self[startIndex.advancedBy(index)]
+        
+    }
+    
+    subscript(range: Range<Int>) -> String {
+        
+        let char0 = startIndex.advancedBy(range.startIndex)
+        
+        let charN = startIndex.advancedBy(range.endIndex)
+        
+        return self[char0..<charN]
+        
+    }
+    
+}
+
+public struct Array2D {
+    
+    var columns: Int
+    var rows: Int
+    var matrix: [Int]
+    
+    
+    init(columns: Int, rows: Int) {
+        
+        self.columns = columns
+        
+        self.rows = rows
+        
+        matrix = Array(count:columns*rows, repeatedValue:0)
+        
+    }
+    
+    subscript(column: Int, row: Int) -> Int {
+        
+        get {
+            
+            return matrix[columns * row + column]
+            
+        }
+        
+        set {
+            
+            matrix[columns * row + column] = newValue
+            
+        }
+        
+    }
+    
+    func columnCount() -> Int {
+        
+        return self.columns
+        
+    }
+    
+    func rowCount() -> Int {
+        
+        return self.rows
+        
+    }
+}
+
+/* Levenshtein Distance Algorithm
+ * Calculates the minimum number of changes (distance) between two strings.
+ */
+
+public func slowlevenshtein(sourceString: String, target targetString: String) -> Int {
+    
+    let source = Array(sourceString.unicodeScalars)
+    let target = Array(targetString.unicodeScalars)
+    
+    let (sourceLength, targetLength) = (source.count, target.count)
+    
+    var matrix = Array(count: targetLength + 1, repeatedValue: Array(count: sourceLength + 1, repeatedValue: 0))
+    
+    for x in  1..<targetLength {
+        
+        matrix[x][0] = matrix[x - 1][0] + 1
+        
+    }
+    
+    for y in 1..<sourceLength {
+        
+        matrix[0][y] = matrix[0][y - 1] + 1
+        
+    }
+    
+    for x in 1..<(targetLength + 1) {
+        
+        for y in 1..<(sourceLength + 1) {
+            
+            let penalty = source[y - 1] == target[x - 1] ? 0 : 1
+            
+            let (deletions, insertions, substitutions) = (matrix[x - 1][y] + 1, matrix[x][y - 1] + 1, matrix[x - 1][y - 1])
+            
+            matrix[x][y] = min3(deletions, b: insertions, c: substitutions + penalty)
+            
+        }
+        
+    }
+    
+    return matrix[targetLength][sourceLength]
+    
+}
+
+public func levenshtein(sourceString: String, target targetString: String) -> Int {
+    
+    let source = Array(sourceString.unicodeScalars)
+    let target = Array(targetString.unicodeScalars)
+    
+    let (sourceLength, targetLength) = (source.count, target.count)
+    
+    var distance = Array2D(columns: sourceLength + 1, rows: targetLength + 1)
+    
+    for x in 1...sourceLength {
+        
+        distance[x, 0] = x
+        
+    }
+    
+    for y in 1...targetLength {
+        
+        distance[0, y] = y
+        
+    }
+    
+    for x in 1...sourceLength {
+        
+        for y in 1...targetLength {
+            
+            if source[x - 1] == target[y - 1] {
+                
+                // no difference
+                distance[x, y] = distance[x - 1, y - 1]
+                
+            } else {
+                
+                distance[x, y] = min3(
+                    
+                    // deletions
+                    distance[x - 1, y] + 1,
+                    // insertions
+                    b: distance[x, y - 1] + 1,
+                    // substitutions
+                    c: distance[x - 1, y - 1] + 1
+                    
+                )
+                
+            }
+            
+        }
+        
+    }
+    
+    return distance[source.count, target.count]
+    
+}
+
+public extension String {
+    
+    func getSlowLevenshtein(target: String) -> Int {
+        
+        return slowlevenshtein(self, target: target)
+    
+    }
+    
+    func getLevenshtein(target: String) -> Int {
+        
+        return levenshtein(self, target: target)
+        
+    }
+    
+}