public void Compare()
{
using (new CultureSwapper(PredefinedCulture.EnglishUnitedStates))
{
Assert.AreEqual(0, Math.Sign(SubstringCompare.Compare("abcdef", 2, 2, "CD", 0, 2, StringComparison.CurrentCultureIgnoreCase)));
Assert.AreEqual(-1, Math.Sign(SubstringCompare.Compare("abcdef", 1, 3, "CD", 0, 2, StringComparison.OrdinalIgnoreCase)),
"'b' should be less than 'C' for case-insensitive comparison");
Assert.AreEqual(1, Math.Sign(SubstringCompare.Compare("abcdef", 1, 3, "CD", 0, 2, StringComparison.Ordinal)),
"'b' should be greater than 'C' for case-sensitive comparison");
Assert.AreEqual(0, Math.Sign(SubstringCompare.Compare("Encyclopædia", 8, 2, "aedia", 0, 3, StringComparison.CurrentCulture)));
Assert.AreEqual(0, Math.Sign(SubstringCompare.Compare("café", 0, 4, "cafe\u0301", 0, 5, StringComparison.CurrentCulture)));
Assert.AreEqual(0, Math.Sign(SubstringCompare.Compare("café", 0, 4, "cafe\u0301", 0, 5, StringComparison.CurrentCultureIgnoreCase)));
Assert.AreEqual(0, Math.Sign(SubstringCompare.Compare("café", 0, 4, "cafe\u0301", 0, 5, StringComparison.InvariantCulture)));
Assert.AreEqual(0, Math.Sign(SubstringCompare.Compare("café", 0, 4, "cafe\u0301", 0, 5, StringComparison.InvariantCultureIgnoreCase)));
Assert.AreEqual(1, Math.Sign(SubstringCompare.Compare("café", 0, 4, "cafe\u0301", 0, 5, StringComparison.Ordinal)));
Assert.AreEqual(1, Math.Sign(SubstringCompare.Compare("café", 0, 4, "cafe\u0301", 0, 5, StringComparison.OrdinalIgnoreCase)));
Assert.AreEqual(-1, Math.Sign(SubstringCompare.Compare("café", 0, 4, "CAFE\u0301", 0, 5, StringComparison.CurrentCulture)));
Assert.AreEqual(0, Math.Sign(SubstringCompare.Compare("café", 0, 4, "CAFE\u0301", 0, 5, StringComparison.CurrentCultureIgnoreCase)));
Assert.AreEqual(-1, Math.Sign(SubstringCompare.Compare("café", 0, 4, "CAFE\u0301", 0, 5, StringComparison.InvariantCulture)));
Assert.AreEqual(0, Math.Sign(SubstringCompare.Compare("café", 0, 4, "CAFE\u0301", 0, 5, StringComparison.InvariantCultureIgnoreCase)));
Assert.AreEqual(1, Math.Sign(SubstringCompare.Compare("café", 0, 4, "CAFE\u0301", 0, 5, StringComparison.Ordinal)));
Assert.AreEqual(1, Math.Sign(SubstringCompare.Compare("café", 0, 4, "CAFE\u0301", 0, 5, StringComparison.OrdinalIgnoreCase)));
Assert.AreEqual(0, Math.Sign(SubstringCompare.Compare("café", 2, 2, "cafe\u0301", 2, 3, StringComparison.CurrentCulture)));
Assert.AreEqual(1, Math.Sign(SubstringCompare.Compare("café", 0, 4, "cafe\u0301", 0, 4, StringComparison.CurrentCulture)));
Assert.AreEqual(1, Math.Sign(SubstringCompare.Compare("abc", 1, 2, "", 0, 0, StringComparison.Ordinal)));
Assert.AreEqual(-1, Math.Sign(SubstringCompare.Compare("", 0, 0, "abc", 0, 2, StringComparison.Ordinal)));
Assert.AreEqual(0, Math.Sign(SubstringCompare.Compare("abc", 1, 0, "", 0, 0, StringComparison.Ordinal)));
Assert.AreEqual(0, Math.Sign(SubstringCompare.Compare("abc123", 2, 3, "ABC123", 2, 3, StringComparison.OrdinalIgnoreCase)));
}
}
private static int FindMatchLength(string source, string substring, int searchIndex, int searchLength, StringComparison comparisonType, int matchIndex)
{
int matchLengthMaximum = searchLength - (matchIndex - searchIndex);
int matchLengthInitial = Math.Min(substring.Length, matchLengthMaximum);
// Hot path: match length is same as specified substring length
if (SubstringCompare.CompareInner(source, matchIndex, matchLengthInitial, substring, 0, substring.Length, comparisonType) == 0)
{
return(matchLengthInitial);
}
int matchLengthDecrementing = matchLengthInitial - 1;
int matchLengthIncrementing = matchLengthInitial + 1;
while (matchLengthDecrementing >= 0 || matchLengthIncrementing <= matchLengthMaximum)
{
if (matchLengthDecrementing >= 0)
{
if (SubstringCompare.CompareInner(source, matchIndex, matchLengthDecrementing, substring, 0, substring.Length, comparisonType) == 0)
{
return(matchLengthDecrementing);
}
matchLengthDecrementing--;
}
if (matchLengthIncrementing <= matchLengthMaximum)
{
if (SubstringCompare.CompareInner(source, matchIndex, matchLengthIncrementing, substring, 0, substring.Length, comparisonType) == 0)
{
return(matchLengthIncrementing);
}
matchLengthIncrementing++;
}
}
// Should never happen
return(-1);
}
public void Compare_ÆbleApple()
{
// Sorting and String Comparison in .NET Framework
// https://msdn.microsoft.com/en-us/goglobal/bb688122.aspx#euf
using (new CultureSwapper(PredefinedCulture.EnglishUnitedStates))
{
string message = "\"Æble\" is less than \"Apple\" for the English culture.";
Assert.AreEqual(-1, Math.Sign(SubstringCompare.Compare("Æble", 0, 4, "Apple", 0, 5, StringComparison.CurrentCulture)), message);
Assert.AreEqual(-1, Math.Sign(SubstringCompare.Compare("Æble", 0, 4, "Apple", 0, 5, StringComparison.CurrentCultureIgnoreCase)), message);
}
using (new CultureSwapper(PredefinedCulture.DanishDenmark))
{
string message = "\"Æble\" is less than \"Apple\" for the invariant culture.";
Assert.AreEqual(-1, Math.Sign(SubstringCompare.Compare("Æble", 0, 4, "Apple", 0, 5, StringComparison.InvariantCulture)), message);
Assert.AreEqual(-1, Math.Sign(SubstringCompare.Compare("Æble", 0, 4, "Apple", 0, 5, StringComparison.InvariantCulture)), message);
message = "\"Æble\" is greater than \"Apple\" for the Danish culture.";
Assert.AreEqual(1, Math.Sign(SubstringCompare.Compare("Æble", 0, 4, "Apple", 0, 5, StringComparison.CurrentCulture)), message);
Assert.AreEqual(1, Math.Sign(SubstringCompare.Compare("Æble", 0, 4, "Apple", 0, 5, StringComparison.CurrentCultureIgnoreCase)), message);
};
}
