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using System;
using System.Collections.Generic;
namespace RyuaNerin
{
public sealed class ExtendStringComparer : IComparer<string>
{
public static readonly Comparison<string> Comparison = new Comparison<string>(CompareTo);
public static readonly ExtendStringComparer Instance = new ExtendStringComparer();
public int Compare(string x, string y)
{
return CompareTo(x, y);
}
private static int Cut(string x, int xindex)
{
bool isInt = char.IsDigit(x[xindex]);
int nindex = xindex + 1;
while (nindex < x.Length)
{
if (isInt != char.IsDigit(x[nindex]))
break;
nindex++;
}
return Math.Min(nindex, x.Length) - xindex;
}
public static int CompareTo(string x, string y)
{
int xindex, yindex;
int xlen, ylen;
int xint, yint;
int i;
int k;
int c;
xindex = yindex = 0;
while (xindex < x.Length && yindex < y.Length)
{
xlen = Cut(x, xindex);
ylen = Cut(y, yindex);
if (xlen == 0 || ylen == 0)
c = xlen.CompareTo(ylen);
else if (char.IsDigit(x[xindex]) && char.IsDigit(y[yindex]) && int.TryParse(x.Substring(xindex, xlen), out xint) && int.TryParse(y.Substring(yindex, ylen), out yint))
c = xint.CompareTo(yint);
else
{
k = Math.Min(xlen, ylen);
c = 0;
for (i = 0; i < k; ++i)
{
if (x[xindex + i] != y[yindex + i])
{
c = x[xindex + i].CompareTo(y[yindex + i]);
break;
}
}
if (c == 0)
c = xlen.CompareTo(ylen);
}
xindex += xlen;
yindex += ylen;
if (c != 0)
return c;
}
return x.Length - y.Length;
}
}
}
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