#22 Updated for swift 5

Fuse/Classes/Fuse.swift

@@ -98,7 +98,7 @@ public class Fuse {
     ///   - pattern: The pattern to search for. This is created by calling `createPattern`
     ///   - aString: The string in which to search for the pattern
     /// - Returns: A tuple containing a `score` between `0.0` (exact match) and `1` (not a match), and `ranges` of the matched characters.
-    public func search(_ pattern: Pattern?, in aString: String) -> (score: Double, ranges: [CountableClosedRange<Int>])? {
+    public func search(_ pattern: Pattern?, in aString: String) -> (score: Double, ranges: [ClosedRange<Int>])? {
         guard let pattern = pattern else {
             return nil
         }
@@ -113,7 +113,7 @@ public class Fuse {
 
         // Exact match
         if (pattern.text == text) {
-            return (0, [CountableClosedRange<Int>(0...textLength - 1)])
+            return (0, [0...textLength - 1])
         }
 
         let location = self.location

Fuse/Classes/FuseUtilities.swift

@@ -54,21 +54,21 @@ class FuseUtilities {
     /// - Parameter mask: A string representing the value to search for.
     ///
     /// - Returns: `CountableClosedRange<Int>` array.
-    static func findRanges(_ mask: [Int]) -> [CountableClosedRange<Int>] {
-        var ranges = [CountableClosedRange<Int>]()
+    static func findRanges(_ mask: [Int]) -> [ClosedRange<Int>] {
+        var ranges = [ClosedRange<Int>]()
         var start: Int = -1
         var end: Int = -1
         for (n, bit) in mask.enumerated() {
             if bit == 1 && start == -1 {
                 start = n
             } else if bit == 0 && start != -1 {
                 end = n - 1
-                ranges.append(CountableClosedRange<Int>(start...end))
+                ranges.append(start...end)
                 start = -1
             }
         }
         if mask.last == 1 {
-            ranges.append(CountableClosedRange<Int>(start...mask.count - 1))
+            ranges.append(start...(mask.count - 1))
         }
         return ranges
     }

Fuse/Classes/String+Fuse.swift

@@ -31,7 +31,7 @@ extension String {
             return nil
         }
 
-        if self.startIndex.encodedOffset + position > self.endIndex.encodedOffset {
+        if self.startIndex.utf16Offset(in: self) + position > self.endIndex.utf16Offset(in: self) {
             return nil
         }