1 files changed, 25 insertions, 0 deletions
diff --git a/Emby.Server.Implementations/TextEncoding/NLangDetect/Extensions/StringExtensions.cs b/Emby.Server.Implementations/TextEncoding/NLangDetect/Extensions/StringExtensions.cs
new file mode 100644
index 000000000..fc6c58a95
--- /dev/null
+++ b/Emby.Server.Implementations/TextEncoding/NLangDetect/Extensions/StringExtensions.cs
@@ -0,0 +1,25 @@
+using System;
+
+namespace NLangDetect.Core.Extensions
+{
+  public static class StringExtensions
+  {
+    /// <summary>
+    /// Returns a new character sequence that is a subsequence of this sequence. The subsequence starts with the character at the specified index and ends with the character at index end - 1. The length of the returned sequence is end - start, so if start == end then an empty sequence is returned.
+    /// </summary>
+    /// <param name="s"></param>
+    /// <param name="start">the start index, inclusive</param>
+    /// <param name="end">the end index, exclusive</param>
+    /// <returns>the specified subsequence</returns>
+    /// <exception cref="IndexOutOfRangeException"> if start or end are negative, if end is greater than length(), or if start is greater than end</exception>
+    public static string SubSequence(this string s, int start, int end)
+    {
+      if (start < 0) throw new ArgumentOutOfRangeException("start", "Argument must not be negative.");
+      if (end < 0) throw new ArgumentOutOfRangeException("end", "Argument must not be negative.");
+      if (end > s.Length) throw new ArgumentOutOfRangeException("end", "Argument must not be greater than the input string's length.");
+      if (start > end) throw new ArgumentOutOfRangeException("start", "Argument must not be greater than the 'end' argument.");
+      
+      return s.Substring(start, end - start);
+    }
+  }
+}