public static bool TryParseAsISO(ReadOnlySpan <char> source, out DateTimeOffset value)
{
if (!IsValidDateTimeOffsetParseLength(source.Length))
{
value = default;
return(false);
}
int maxLength = checked (source.Length * JsonConstants.MaxExpansionFactorWhileTranscoding);
Span <byte> bytes = maxLength <= JsonConstants.StackallocThreshold
? stackalloc byte[JsonConstants.StackallocThreshold]
: new byte[maxLength];
int length = JsonReaderHelper.GetUtf8FromText(source, bytes);
bytes = bytes.Slice(0, length);
if (bytes.IndexOf(JsonConstants.BackSlash) != -1)
{
return(JsonReaderHelper.TryGetEscapedDateTimeOffset(bytes, out value));
}
Debug.Assert(bytes.IndexOf(JsonConstants.BackSlash) == -1);
if (TryParseAsISO(bytes, out DateTimeOffset tmp))
{
value = tmp;
return(true);
}
value = default;
return(false);
}
/// <summary>
/// Parses the current JSON token value from the source as a <see cref="DateTimeOffset"/>.
/// Returns <see langword="true"/> if the entire UTF-8 encoded token value can be successfully
/// parsed to a <see cref="DateTimeOffset"/> value.
/// Returns <see langword="false"/> otherwise.
/// </summary>
/// <exception cref="InvalidOperationException">
/// Thrown if trying to get the value of a JSON token that is not a <see cref="JsonTokenType.String"/>.
/// <seealso cref="TokenType" />
/// </exception>
public bool TryGetDateTimeOffset(out DateTimeOffset value)
{
if (TokenType != JsonTokenType.String)
{
throw ThrowHelper.GetInvalidOperationException_ExpectedString(TokenType);
}
ReadOnlySpan <byte> span = stackalloc byte[0];
if (HasValueSequence)
{
long sequenceLength = ValueSequence.Length;
if (!JsonReaderHelper.IsValidDateTimeOffsetParseLength(sequenceLength))
{
value = default;
return(false);
}
Debug.Assert(sequenceLength <= JsonConstants.MaximumEscapedDateTimeOffsetParseLength);
Span <byte> stackSpan = stackalloc byte[(int)sequenceLength];
ValueSequence.CopyTo(stackSpan);
span = stackSpan;
}
else
{
if (!JsonReaderHelper.IsValidDateTimeOffsetParseLength(ValueSpan.Length))
{
value = default;
return(false);
}
span = ValueSpan;
}
if (_stringHasEscaping)
{
return(JsonReaderHelper.TryGetEscapedDateTimeOffset(span, out value));
}
Debug.Assert(span.IndexOf(JsonConstants.BackSlash) == -1);
if (span.Length <= JsonConstants.MaximumDateTimeOffsetParseLength &&
JsonHelpers.TryParseAsISO(span, out DateTimeOffset tmp, out int bytesConsumed) &&
span.Length == bytesConsumed)
{
value = tmp;
return(true);
}
value = default;
return(false);
}
internal bool TryGetDateTimeOffsetCore(out DateTimeOffset value)
{
ReadOnlySpan <byte> span = stackalloc byte[0];
if (HasValueSequence)
{
long sequenceLength = ValueSequence.Length;
if (!JsonHelpers.IsValidDateTimeOffsetParseLength(sequenceLength))
{
value = default;
return(false);
}
Debug.Assert(sequenceLength <= JsonConstants.MaximumEscapedDateTimeOffsetParseLength);
Span <byte> stackSpan = stackalloc byte[(int)sequenceLength];
ValueSequence.CopyTo(stackSpan);
span = stackSpan;
}
else
{
if (!JsonHelpers.IsValidDateTimeOffsetParseLength(ValueSpan.Length))
{
value = default;
return(false);
}
span = ValueSpan;
}
if (_stringHasEscaping)
{
return(JsonReaderHelper.TryGetEscapedDateTimeOffset(span, out value));
}
Debug.Assert(span.IndexOf(JsonConstants.BackSlash) == -1);
if (JsonHelpers.TryParseAsISO(span, out DateTimeOffset tmp))
{
value = tmp;
return(true);
}
value = default;
return(false);
}
