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sorting: code style 

Signed-off-by: Christoph Ruegg <git@cdrnet.ch>
pull/2/head
Christoph Ruegg 17 years ago
parent
d6e1626dcc
commit
1d21cb5de6
1 changed files with 89 additions and 82 deletions
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  1. 171
      src/Numerics/Sorting.cs

171
src/Numerics/Sorting.cs
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@ -30,7 +30,6 @@ namespace MathNet.Numerics
{
using System;
using System.Collections.Generic;
using System.Text;
/// <summary>
/// Sorting algorithms for single, tuple and triple lists.
@ -93,25 +92,25 @@ namespace MathNet.Numerics
/// <param name="comparer">Comparison, defining the sort order.</param>
public static void Sort<T>(IList<T> keys, IComparer<T> comparer)
{
if(null == keys)
if (null == keys)
{
throw new ArgumentNullException("keys");
}
if(null == comparer)
if (null == comparer)
{
throw new ArgumentNullException("comparer");
}
// basic cases
if(keys.Count <= 1)
if (keys.Count <= 1)
{
return;
}
if(keys.Count == 2)
if (keys.Count == 2)
{
if(comparer.Compare(keys[0], keys[1]) > 0)
if (comparer.Compare(keys[0], keys[1]) > 0)
{
Swap(keys, 0, 1);
}
@ -120,18 +119,18 @@ namespace MathNet.Numerics
}
// generic list case
List<T> list = keys as List<T>;
if(null != list)
var keysList = keys as List<T>;
if (null != keysList)
{
list.Sort(comparer);
keysList.Sort(comparer);
return;
}
// array case
T[] array = keys as T[];
if(null != array)
var keysArray = keys as T[];
if (null != keysArray)
{
Array.Sort(array, comparer);
Array.Sort(keysArray, comparer);
return;
}
@ -149,25 +148,25 @@ namespace MathNet.Numerics
/// <param name="comparer">Comparison, defining the sort order.</param>
public static void Sort<TKey, TItem>(IList<TKey> keys, IList<TItem> items, IComparer<TKey> comparer)
{
if(null == keys)
if (null == keys)
{
throw new ArgumentNullException("keys");
}
if(null == items)
if (null == items)
{
throw new ArgumentNullException("items");
}
if(null == comparer)
if (null == comparer)
{
throw new ArgumentNullException("comparer");
}
// array case
TKey[] keysArray = keys as TKey[];
TItem[] itemsArray = items as TItem[];
if((null != keysArray) && (null != itemsArray))
var keysArray = keys as TKey[];
var itemsArray = items as TItem[];
if ((null != keysArray) && (null != itemsArray))
{
Array.Sort(keysArray, itemsArray, comparer);
return;
@ -190,22 +189,22 @@ namespace MathNet.Numerics
public static void Sort<TKey, TItem1, TItem2>(
IList<TKey> keys, IList<TItem1> items1, IList<TItem2> items2, IComparer<TKey> comparer)
{
if(null == keys)
if (null == keys)
{
throw new ArgumentNullException("keys");
}
if(null == items1)
if (null == items1)
{
throw new ArgumentNullException("items1");
}
if(null == items2)
if (null == items2)
{
throw new ArgumentNullException("items2");
}
if(null == comparer)
if (null == comparer)
{
throw new ArgumentNullException("comparer");
}
@ -224,35 +223,35 @@ namespace MathNet.Numerics
/// <param name="comparer">Comparison, defining the sort order.</param>
public static void Sort<T>(IList<T> keys, int index, int count, IComparer<T> comparer)
{
if(null == keys)
if (null == keys)
{
throw new ArgumentNullException("keys");
}
if(null == comparer)
if (null == comparer)
{
throw new ArgumentNullException("comparer");
}
if(index < 0 || index >= keys.Count)
if (index < 0 || index >= keys.Count)
{
throw new ArgumentOutOfRangeException("index");
}
if(count < 0 || index + count > keys.Count)
if (count < 0 || index + count > keys.Count)
{
throw new ArgumentOutOfRangeException("count");
}
// basic cases
if(count <= 1)
if (count <= 1)
{
return;
}
if(count == 2)
if (count == 2)
{
if(comparer.Compare(keys[index], keys[index + 1]) > 0)
if (comparer.Compare(keys[index], keys[index + 1]) > 0)
{
Swap(keys, index, index + 1);
}
@ -261,18 +260,18 @@ namespace MathNet.Numerics
}
// generic list case
List<T> list = keys as List<T>;
if(null != list)
var keysList = keys as List<T>;
if (null != keysList)
{
list.Sort(index, count, comparer);
keysList.Sort(index, count, comparer);
return;
}
// array case
T[] array = keys as T[];
if(null != array)
var keysArray = keys as T[];
if (null != keysArray)
{
Array.Sort(array, index, count, comparer);
Array.Sort(keysArray, index, count, comparer);
return;
}
@ -288,7 +287,11 @@ namespace MathNet.Numerics
/// <param name="comparer">The method with which to compare two elements of the quick sort.</param>
/// <param name="left">The left boundary of the quick sort.</param>
/// <param name="right">The right boundary of the quick sort.</param>
private static void QuickSort<T>(IList<T> keys, IComparer<T> comparer, int left, int right)
private static void QuickSort<T>(
IList<T> keys,
IComparer<T> comparer,
int left,
int right)
{
do
{
@ -297,17 +300,17 @@ namespace MathNet.Numerics
int b = right;
int p = a + ((b - a) >> 1); // midpoint
if(comparer.Compare(keys[a], keys[p]) > 0)
if (comparer.Compare(keys[a], keys[p]) > 0)
{
Swap(keys, a, p);
}
if(comparer.Compare(keys[a], keys[b]) > 0)
if (comparer.Compare(keys[a], keys[b]) > 0)
{
Swap(keys, a, b);
}
if(comparer.Compare(keys[p], keys[b]) > 0)
if (comparer.Compare(keys[p], keys[b]) > 0)
{
Swap(keys, p, b);
}
@ -317,36 +320,35 @@ namespace MathNet.Numerics
// Hoare Partitioning
do
{
while(comparer.Compare(keys[a], pivot) < 0)
while (comparer.Compare(keys[a], pivot) < 0)
{
a++;
}
while(comparer.Compare(pivot, keys[b]) < 0)
while (comparer.Compare(pivot, keys[b]) < 0)
{
b--;
}
if(a > b)
if (a > b)
{
break;
}
if(a < b)
if (a < b)
{
Swap(keys, a, b);
}
a++;
b--;
}
while(a <= b);
} while (a <= b);
// In order to limit the recusion depth to log(n), we sort the
// shorter partition recusively and the longer partition iteratively.
if((b - left) <= (right - a))
if ((b - left) <= (right - a))
{
if(left < b)
if (left < b)
{
QuickSort(keys, comparer, left, b);
}
@ -355,15 +357,14 @@ namespace MathNet.Numerics
}
else
{
if(a < right)
if (a < right)
{
QuickSort(keys, comparer, a, right);
}
right = b;
}
}
while(left < right);
} while (left < right);
}
/// <summary>
@ -376,7 +377,12 @@ namespace MathNet.Numerics
/// <param name="comparer">The method with which to compare two elements of the quick sort.</param>
/// <param name="left">The left boundary of the quick sort.</param>
/// <param name="right">The right boundary of the quick sort.</param>
private static void QuickSort<T, TItems>(IList<T> keys, IList<TItems> items, IComparer<T> comparer, int left, int right)
private static void QuickSort<T, TItems>(
IList<T> keys,
IList<TItems> items,
IComparer<T> comparer,
int left,
int right)
{
do
{
@ -385,19 +391,19 @@ namespace MathNet.Numerics
int b = right;
int p = a + ((b - a) >> 1); // midpoint
if(comparer.Compare(keys[a], keys[p]) > 0)
if (comparer.Compare(keys[a], keys[p]) > 0)
{
Swap(keys, a, p);
Swap(items, a, p);
}
if(comparer.Compare(keys[a], keys[b]) > 0)
if (comparer.Compare(keys[a], keys[b]) > 0)
{
Swap(keys, a, b);
Swap(items, a, b);
}
if(comparer.Compare(keys[p], keys[b]) > 0)
if (comparer.Compare(keys[p], keys[b]) > 0)
{
Swap(keys, p, b);
Swap(items, p, b);
@ -408,22 +414,22 @@ namespace MathNet.Numerics
// Hoare Partitioning
do
{
while(comparer.Compare(keys[a], pivot) < 0)
while (comparer.Compare(keys[a], pivot) < 0)
{
a++;
}
while(comparer.Compare(pivot, keys[b]) < 0)
while (comparer.Compare(pivot, keys[b]) < 0)
{
b--;
}
if(a > b)
if (a > b)
{
break;
}
if(a < b)
if (a < b)
{
Swap(keys, a, b);
Swap(items, a, b);
@ -431,14 +437,13 @@ namespace MathNet.Numerics
a++;
b--;
}
while(a <= b);
} while (a <= b);
// In order to limit the recusion depth to log(n), we sort the
// shorter partition recusively and the longer partition iteratively.
if((b - left) <= (right - a))
if ((b - left) <= (right - a))
{
if(left < b)
if (left < b)
{
QuickSort(keys, items, comparer, left, b);
}
@ -447,15 +452,14 @@ namespace MathNet.Numerics
}
else
{
if(a < right)
if (a < right)
{
QuickSort(keys, items, comparer, a, right);
}
right = b;
}
}
while(left < right);
} while (left < right);
}
/// <summary>
@ -471,7 +475,12 @@ namespace MathNet.Numerics
/// <param name="left">The left boundary of the quick sort.</param>
/// <param name="right">The right boundary of the quick sort.</param>
private static void QuickSort<T, TItems1, TItems2>(
IList<T> keys, IList<TItems1> items1, IList<TItems2> items2, IComparer<T> comparer, int left, int right)
IList<T> keys,
IList<TItems1> items1,
IList<TItems2> items2,
IComparer<T> comparer,
int left,
int right)
{
do
{
@ -480,21 +489,21 @@ namespace MathNet.Numerics
int b = right;
int p = a + ((b - a) >> 1); // midpoint
if(comparer.Compare(keys[a], keys[p]) > 0)
if (comparer.Compare(keys[a], keys[p]) > 0)
{
Swap(keys, a, p);
Swap(items1, a, p);
Swap(items2, a, p);
}
if(comparer.Compare(keys[a], keys[b]) > 0)
if (comparer.Compare(keys[a], keys[b]) > 0)
{
Swap(keys, a, b);
Swap(items1, a, b);
Swap(items2, a, b);
}
if(comparer.Compare(keys[p], keys[b]) > 0)
if (comparer.Compare(keys[p], keys[b]) > 0)
{
Swap(keys, p, b);
Swap(items1, p, b);
@ -506,22 +515,22 @@ namespace MathNet.Numerics
// Hoare Partitioning
do
{
while(comparer.Compare(keys[a], pivot) < 0)
while (comparer.Compare(keys[a], pivot) < 0)
{
a++;
}
while(comparer.Compare(pivot, keys[b]) < 0)
while (comparer.Compare(pivot, keys[b]) < 0)
{
b--;
}
if(a > b)
if (a > b)
{
break;
}
if(a < b)
if (a < b)
{
Swap(keys, a, b);
Swap(items1, a, b);
@ -530,14 +539,13 @@ namespace MathNet.Numerics
a++;
b--;
}
while(a <= b);
} while (a <= b);
// In order to limit the recusion depth to log(n), we sort the
// shorter partition recusively and the longer partition iteratively.
if((b - left) <= (right - a))
if ((b - left) <= (right - a))
{
if(left < b)
if (left < b)
{
QuickSort(keys, items1, items2, comparer, left, b);
}
@ -546,15 +554,14 @@ namespace MathNet.Numerics
}
else
{
if(a < right)
if (a < right)
{
QuickSort(keys, items1, items2, comparer, a, right);
}
right = b;
}
}
while(left < right);
} while (left < right);
}
/// <summary>
@ -566,7 +573,7 @@ namespace MathNet.Numerics
/// <param name="b">The index of the second element of the swap.</param>
internal static void Swap<T>(IList<T> keys, int a, int b)
{
if(a != b)
if (a != b)
{
T local = keys[a];
keys[a] = keys[b];
@ -574,4 +581,4 @@ namespace MathNet.Numerics
}
}
}
}
}
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