Merge pull request #2474 from JustAMan/simplify-sorting

Simplify AlphanumericComparer, reduce code duplication

1 files changed, 5 insertions, 117 deletions

diff --git a/MediaBrowser.Controller/Sorting/SortExtensions.cs b/MediaBrowser.Controller/Sorting/SortExtensions.cs
index 111f4f17f..f5ee574a2 100644
--- a/MediaBrowser.Controller/Sorting/SortExtensions.cs
+++ b/MediaBrowser.Controller/Sorting/SortExtensions.cs
@@ -7,137 +7,25 @@ namespace MediaBrowser.Controller.Sorting
 {
     public static class SortExtensions
     {
+        private static readonly AlphanumComparator _comparer = new AlphanumComparator();
         public static IEnumerable<T> OrderByString<T>(this IEnumerable<T> list, Func<T, string> getName)
         {
-            return list.OrderBy(getName, new AlphanumComparator());
+            return list.OrderBy(getName, _comparer);
         }
 
         public static IEnumerable<T> OrderByStringDescending<T>(this IEnumerable<T> list, Func<T, string> getName)
         {
-            return list.OrderByDescending(getName, new AlphanumComparator());
+            return list.OrderByDescending(getName, _comparer);
         }
 
         public static IOrderedEnumerable<T> ThenByString<T>(this IOrderedEnumerable<T> list, Func<T, string> getName)
         {
-            return list.ThenBy(getName, new AlphanumComparator());
+            return list.ThenBy(getName, _comparer);
         }
 
         public static IOrderedEnumerable<T> ThenByStringDescending<T>(this IOrderedEnumerable<T> list, Func<T, string> getName)
         {
-            return list.ThenByDescending(getName, new AlphanumComparator());
-        }
-
-        private class AlphanumComparator : IComparer<string>
-        {
-            private enum ChunkType { Alphanumeric, Numeric };
-
-            private static bool InChunk(char ch, char otherCh)
-            {
-                var type = ChunkType.Alphanumeric;
-
-                if (char.IsDigit(otherCh))
-                {
-                    type = ChunkType.Numeric;
-                }
-
-                if ((type == ChunkType.Alphanumeric && char.IsDigit(ch))
-                    || (type == ChunkType.Numeric && !char.IsDigit(ch)))
-                {
-                    return false;
-                }
-
-                return true;
-            }
-
-            public static int CompareValues(string s1, string s2)
-            {
-                if (s1 == null || s2 == null)
-                {
-                    return 0;
-                }
-
-                int thisMarker = 0, thisNumericChunk = 0;
-                int thatMarker = 0, thatNumericChunk = 0;
-
-                while ((thisMarker < s1.Length) || (thatMarker < s2.Length))
-                {
-                    if (thisMarker >= s1.Length)
-                    {
-                        return -1;
-                    }
-                    else if (thatMarker >= s2.Length)
-                    {
-                        return 1;
-                    }
-                    char thisCh = s1[thisMarker];
-                    char thatCh = s2[thatMarker];
-
-                    var thisChunk = new StringBuilder();
-                    var thatChunk = new StringBuilder();
-
-                    while ((thisMarker < s1.Length) && (thisChunk.Length == 0 || InChunk(thisCh, thisChunk[0])))
-                    {
-                        thisChunk.Append(thisCh);
-                        thisMarker++;
-
-                        if (thisMarker < s1.Length)
-                        {
-                            thisCh = s1[thisMarker];
-                        }
-                    }
-
-                    while ((thatMarker < s2.Length) && (thatChunk.Length == 0 || InChunk(thatCh, thatChunk[0])))
-                    {
-                        thatChunk.Append(thatCh);
-                        thatMarker++;
-
-                        if (thatMarker < s2.Length)
-                        {
-                            thatCh = s2[thatMarker];
-                        }
-                    }
-
-                    int result = 0;
-                    // If both chunks contain numeric characters, sort them numerically
-                    if (char.IsDigit(thisChunk[0]) && char.IsDigit(thatChunk[0]))
-                    {
-                        if (!int.TryParse(thisChunk.ToString(), out thisNumericChunk))
-                        {
-                            return 0;
-                        }
-                        if (!int.TryParse(thatChunk.ToString(), out thatNumericChunk))
-                        {
-                            return 0;
-                        }
-
-                        if (thisNumericChunk < thatNumericChunk)
-                        {
-                            result = -1;
-                        }
-
-                        if (thisNumericChunk > thatNumericChunk)
-                        {
-                            result = 1;
-                        }
-                    }
-                    else
-                    {
-                        result = thisChunk.ToString().CompareTo(thatChunk.ToString());
-                    }
-
-                    if (result != 0)
-                    {
-                        return result;
-                    }
-                }
-
-                return 0;
-            }
-
-            public int Compare(string x, string y)
-            {
-                return CompareValues(x, y);
-            }
+            return list.ThenByDescending(getName, _comparer);
         }
     }
 }