public static bool TryParse(ReadOnlySpan <char> input, [NotNullWhen(true)] out Version?result) => (result = ParseVersion(input, throwOnFailure: false)) != null;
private static Version?ParseVersion(ReadOnlySpan <char> input, bool throwOnFailure)
{
// Find the separator between major and minor. It must exist.
int majorEnd = input.IndexOf('.');
if (majorEnd < 0)
{
if (throwOnFailure)
{
throw new ArgumentException(SR.Arg_VersionString, nameof(input));
}
return(null);
}
// Find the ends of the optional minor and build portions.
// We musn't have any separators after build.
int buildEnd = -1;
int minorEnd = input.Slice(majorEnd + 1).IndexOf('.');
if (minorEnd != -1)
{
minorEnd += (majorEnd + 1);
buildEnd = input.Slice(minorEnd + 1).IndexOf('.');
if (buildEnd != -1)
{
buildEnd += (minorEnd + 1);
if (input.Slice(buildEnd + 1).Contains('.'))
{
if (throwOnFailure)
{
throw new ArgumentException(SR.Arg_VersionString, nameof(input));
}
return(null);
}
}
}
int minor, build, revision;
// Parse the major version
if (!TryParseComponent(input.Slice(0, majorEnd), nameof(input), throwOnFailure, out int major))
{
return(null);
}
if (minorEnd != -1)
{
// If there's more than a major and minor, parse the minor, too.
if (!TryParseComponent(input.Slice(majorEnd + 1, minorEnd - majorEnd - 1), nameof(input), throwOnFailure, out minor))
{
return(null);
}
if (buildEnd != -1)
{
// major.minor.build.revision
return
(TryParseComponent(input.Slice(minorEnd + 1, buildEnd - minorEnd - 1), nameof(build), throwOnFailure, out build) &&
TryParseComponent(input.Slice(buildEnd + 1), nameof(revision), throwOnFailure, out revision) ?
new Version(major, minor, build, revision) :
null);
}
else
{
// major.minor.build
return(TryParseComponent(input.Slice(minorEnd + 1), nameof(build), throwOnFailure, out build) ?
new Version(major, minor, build) :
null);
}
}
else
{
// major.minor
return(TryParseComponent(input.Slice(majorEnd + 1), nameof(input), throwOnFailure, out minor) ?
new Version(major, minor) :
null);
}
}
bool ISpanFormattable.TryFormat(Span <char> destination, out int charsWritten, ReadOnlySpan <char> format, IFormatProvider?provider)
{
// format and provider are ignored.
return(TryFormat(destination, out charsWritten));
}
public static Version Parse(ReadOnlySpan <char> input) => ParseVersion(input, throwOnFailure: true) !;
public static bool TryParse(ReadOnlySpan <char> s, NumberStyles style, IFormatProvider provider, out int result)
{
NumberFormatInfo.ValidateParseStyleInteger(style);
return(Number.TryParseInt32(s, style, NumberFormatInfo.GetInstance(provider), out result, out _));
}
public static bool TryFormat(this int value, Span <char> destination, out int charsWritten, ReadOnlySpan <char> format = default, IFormatProvider provider = null)
{
#if NETCOREAPP2_1
return(value.TryFormat(destination, out charsWritten, format, provider));
#else
var str = value.ToString(format.ToString(), provider);
if (str.AsSpan().TryCopyTo(destination))
{
charsWritten = str.Length;
return(true);
}
charsWritten = 0;
return(false);
#endif
}
public static int Parse(ReadOnlySpan <char> s, NumberStyles style = NumberStyles.Integer, IFormatProvider provider = null)
{
NumberFormatInfo.ValidateParseStyleInteger(style);
return(Number.ParseInt32(s, style, NumberFormatInfo.GetInstance(provider)));
}
public static bool TryParse(ReadOnlySpan <char> s, out int result)
{
return(Number.TryParseInt32(s, NumberStyles.Integer, NumberFormatInfo.CurrentInfo, out result, out _));
}
public bool TryFormat(Span <char> destination, out int charsWritten, ReadOnlySpan <char> format = default, IFormatProvider provider = null)
{
return(Number.TryFormatInt32(m_value, format, provider, destination, out charsWritten));
}
public static bool TryParse(ReadOnlySpan <char> s, out Int16 result, NumberStyles style = NumberStyles.Integer, IFormatProvider provider = null)
{
NumberFormatInfo.ValidateParseStyleInteger(style);
return(TryParse(s, style, NumberFormatInfo.GetInstance(provider), out result));
}
internal static int GetHashCodeOrdinalIgnoreCase(ReadOnlySpan <char> value)
{
ulong seed = Marvin.DefaultSeed;
return(Marvin.ComputeHash32OrdinalIgnoreCase(ref MemoryMarshal.GetReference(value), value.Length /* in chars, not bytes */, (uint)seed, (uint)(seed >> 32)));
}
public static int GetHashCode(ReadOnlySpan <char> value)
{
ulong seed = Marvin.DefaultSeed;
return(Marvin.ComputeHash32(ref Unsafe.As <char, byte>(ref MemoryMarshal.GetReference(value)), value.Length * 2 /* in bytes, not chars */, (uint)seed, (uint)(seed >> 32)));
}
internal static int CompareOrdinal(ReadOnlySpan <char> strA, ReadOnlySpan <char> strB) => SpanHelpers.SequenceCompareTo(ref MemoryMarshal.GetReference(strA), strA.Length, ref MemoryMarshal.GetReference(strB), strB.Length);
