internal static bool EqualsOrdinalIgnoreCase(this ReadOnlySpan <char> span, ReadOnlySpan <char> value)
{
if (span.Length != value.Length)
{
return(false);
}
if (value.Length == 0) // span.Length == value.Length == 0
{
return(true);
}
return(Ordinal.EqualsIgnoreCase(ref MemoryMarshal.GetReference(span), ref MemoryMarshal.GetReference(value), span.Length));
}
public bool StartsWith(string value, StringComparison comparisonType)
{
if (value is null)
{
throw new ArgumentNullException(nameof(value));
}
if ((object)this == (object)value)
{
CheckStringComparison(comparisonType);
return(true);
}
if (value.Length == 0)
{
CheckStringComparison(comparisonType);
return(true);
}
switch (comparisonType)
{
case StringComparison.CurrentCulture:
case StringComparison.CurrentCultureIgnoreCase:
return(CultureInfo.CurrentCulture.CompareInfo.IsPrefix(this, value, GetCaseCompareOfComparisonCulture(comparisonType)));
case StringComparison.InvariantCulture:
case StringComparison.InvariantCultureIgnoreCase:
return(CompareInfo.Invariant.IsPrefix(this, value, GetCaseCompareOfComparisonCulture(comparisonType)));
case StringComparison.Ordinal:
if (this.Length < value.Length || _firstChar != value._firstChar)
{
return(false);
}
return((value.Length == 1) ?
true : // First char is the same and thats all there is to compare
SpanHelpers.SequenceEqual(
ref Unsafe.As <char, byte>(ref this.GetRawStringData()),
ref Unsafe.As <char, byte>(ref value.GetRawStringData()),
((nuint)value.Length) * 2));
case StringComparison.OrdinalIgnoreCase:
if (this.Length < value.Length)
{
return(false);
}
return(Ordinal.EqualsIgnoreCase(ref this.GetRawStringData(), ref value.GetRawStringData(), value.Length));
default:
throw new ArgumentException(SR.NotSupported_StringComparison, nameof(comparisonType));
}
}
public bool EndsWith(string value, StringComparison comparisonType)
{
ArgumentNullException.ThrowIfNull(value);
if ((object)this == (object)value)
{
CheckStringComparison(comparisonType);
return(true);
}
if (value.Length == 0)
{
CheckStringComparison(comparisonType);
return(true);
}
switch (comparisonType)
{
case StringComparison.CurrentCulture:
case StringComparison.CurrentCultureIgnoreCase:
return(CultureInfo.CurrentCulture.CompareInfo.IsSuffix(this, value, GetCaseCompareOfComparisonCulture(comparisonType)));
case StringComparison.InvariantCulture:
case StringComparison.InvariantCultureIgnoreCase:
return(CompareInfo.Invariant.IsSuffix(this, value, GetCaseCompareOfComparisonCulture(comparisonType)));
case StringComparison.Ordinal:
int offset = this.Length - value.Length;
return((uint)offset <= (uint)this.Length && this.AsSpan(offset).SequenceEqual(value));
case StringComparison.OrdinalIgnoreCase:
return(Length >= value.Length &&
Ordinal.EqualsIgnoreCase(ref Unsafe.Add(ref GetRawStringData(), Length - value.Length),
ref value.GetRawStringData(),
value.Length));
default:
throw new ArgumentException(SR.NotSupported_StringComparison, nameof(comparisonType));
}
}
private static bool EqualsOrdinalIgnoreCaseNoLengthCheck(string strA, string strB)
{
Debug.Assert(strA.Length == strB.Length);
return(Ordinal.EqualsIgnoreCase(ref strA.GetRawStringData(), ref strB.GetRawStringData(), strB.Length));
}
internal static bool StartsWithOrdinalIgnoreCase(this ReadOnlySpan <char> span, ReadOnlySpan <char> value) => value.Length <= span.Length && Ordinal.EqualsIgnoreCase(ref MemoryMarshal.GetReference(span), ref MemoryMarshal.GetReference(value), value.Length);