public void CanCompareStrings()
{
var comparer = new NumericStringComparer();
Assert.AreEqual(0, comparer.Compare(null, null));
Assert.AreEqual(0, comparer.Compare(string.Empty, string.Empty));
Assert.AreEqual(0, comparer.Compare("", ""));
Assert.AreEqual(0, comparer.Compare(" ", " "));
Assert.AreEqual(0, comparer.Compare("a", "a"));
Assert.AreEqual(0, comparer.Compare("a", "A"));
Assert.AreEqual(-1, comparer.Compare(null, "a"));
Assert.AreEqual(-1, comparer.Compare(string.Empty, "a"));
Assert.AreEqual(-1, comparer.Compare("", "a"));
Assert.AreEqual(-1, comparer.Compare(" ", "a"));
Assert.AreEqual(-1, comparer.Compare("a", "b"));
Assert.AreEqual(-1, comparer.Compare("A", "b"));
Assert.AreEqual(1, comparer.Compare("a", null));
Assert.AreEqual(1, comparer.Compare("a", string.Empty));
Assert.AreEqual(1, comparer.Compare("a", ""));
Assert.AreEqual(1, comparer.Compare("a", " "));
Assert.AreEqual(1, comparer.Compare("b", "a"));
Assert.AreEqual(1, comparer.Compare("b", "A"));
}
public void CanCompareNumbers()
{
var comparer = new NumericStringComparer();
Assert.AreEqual(0, comparer.Compare("1", "1"));
Assert.AreEqual(0, comparer.Compare("1.0", "1.0"));
Assert.AreEqual(-1, comparer.Compare("1", "2"));
Assert.AreEqual(-1, comparer.Compare("1.0", "1.1"));
Assert.AreEqual(-1, comparer.Compare("1.1", "2"));
Assert.AreEqual(-1, comparer.Compare("2", "10.0"));
Assert.AreEqual(1, comparer.Compare("2", "1"));
Assert.AreEqual(1, comparer.Compare("2", "1.0"));
Assert.AreEqual(1, comparer.Compare("2", "1.1"));
Assert.AreEqual(1, comparer.Compare("10.0", "2"));
}
public static IOrderedEnumerable <T> OrderByNatural <T>(this IEnumerable <T> ienumerable, Func <T, string> selector, NumberFormatInfo numberFormat = null)
{
if (ienumerable.Count() == 0)
{
return(ienumerable.OrderBy(x => 1));
}
if (numberFormat == null)
{
numberFormat = Thread.CurrentThread.CurrentCulture.NumberFormat;
}
var decimalSeparator = numberFormat.NumberDecimalSeparator;
if (!naturalOrderRegexes.TryGetValue(decimalSeparator, out Regex naturalOrderRegex))
{
naturalOrderRegex = naturalOrderRegexes.Values.First();
}
var items = ienumerable.Select(i => new { Item = i, Text = selector(i) }).Select(s => new {
Item = s.Item,
TextColumns = naturalOrderRegex.Matches(s.Text).OfType <Match>().Select(m => m.Captures[0].Value).Where(x => !string.IsNullOrEmpty(x)).ToArray()
});
var maxColumnCount = items.Max(l => l.TextColumns.Count());
items = items.Select(s =>
{
string[] a = new string[maxColumnCount];
s.TextColumns.CopyTo(a, 0);
return(new { Item = s.Item, TextColumns = a });
});
var numbericStringComparer = new NumericStringComparer(numberFormat);
var orderedItems = items.OrderBy(x => x.TextColumns[0], numbericStringComparer);
for (int i = 1; i < maxColumnCount; i++)
{
int columnIndex = i; //avoids out of bounds exception
orderedItems = orderedItems.ThenBy(x => x.TextColumns[columnIndex], numbericStringComparer);
}
return(orderedItems.Select(x => x.Item).OrderBy(x => 1));
}
public void CanCompareNumericStrings()
{
var comparer = new NumericStringComparer();
Assert.AreEqual(0, comparer.Compare("1a", "1a"));
Assert.AreEqual(0, comparer.Compare("a1", "a1"));
Assert.AreEqual(-1, comparer.Compare("1a", "2a"));
Assert.AreEqual(-1, comparer.Compare("1a", "10a"));
Assert.AreEqual(-1, comparer.Compare("a1", "a2"));
Assert.AreEqual(-1, comparer.Compare("a2", "a11"));
Assert.AreEqual(-1, comparer.Compare("a2a", "a11a"));
Assert.AreEqual(1, comparer.Compare("2a", "1a"));
Assert.AreEqual(1, comparer.Compare("10a", "1a"));
Assert.AreEqual(1, comparer.Compare("a2", "a1"));
Assert.AreEqual(1, comparer.Compare("a11", "a2"));
Assert.AreEqual(1, comparer.Compare("a11a", "a2a"));
//multiple numbers
Assert.AreEqual(-1, comparer.Compare("1a2a", "2a1a"));
Assert.AreEqual(1, comparer.Compare("10a1a", "2a2a"));
}
