internal static void ValidateNumber(ReadOnlySpan <byte> utf8FormattedNumber)
{
// This is a simplified version of the number reader from Utf8JsonReader.TryGetNumber,
// because it doesn't need to deal with "NeedsMoreData", or remembering the format.
//
// The Debug.Asserts in this method should change to validated ArgumentExceptions if/when
// writing a formatted number becomes public API.
Debug.Assert(!utf8FormattedNumber.IsEmpty);
int i = 0;
if (utf8FormattedNumber[i] == '-')
{
i++;
if (utf8FormattedNumber.Length <= i)
{
throw new ArgumentException(SR.RequiredDigitNotFoundEndOfData, nameof(utf8FormattedNumber));
}
}
if (utf8FormattedNumber[i] == '0')
{
i++;
}
else
{
while (i < utf8FormattedNumber.Length && JsonHelpers.IsDigit(utf8FormattedNumber[i]))
{
i++;
}
}
if (i == utf8FormattedNumber.Length)
{
return;
}
// The non digit character inside the number
byte val = utf8FormattedNumber[i];
if (val == '.')
{
i++;
if (utf8FormattedNumber.Length <= i)
{
throw new ArgumentException(SR.RequiredDigitNotFoundEndOfData, nameof(utf8FormattedNumber));
}
while (i < utf8FormattedNumber.Length && JsonHelpers.IsDigit(utf8FormattedNumber[i]))
{
i++;
}
if (i == utf8FormattedNumber.Length)
{
return;
}
Debug.Assert(i < utf8FormattedNumber.Length);
val = utf8FormattedNumber[i];
}
if (val == 'e' || val == 'E')
{
i++;
if (utf8FormattedNumber.Length <= i)
{
throw new ArgumentException(SR.RequiredDigitNotFoundEndOfData, nameof(utf8FormattedNumber));
}
val = utf8FormattedNumber[i];
if (val == '+' || val == '-')
{
i++;
}
}
else
{
throw new ArgumentException(
SR.Format(SR.ExpectedEndOfDigitNotFound, ThrowHelper.GetPrintableString(val)),
nameof(utf8FormattedNumber));
}
if (utf8FormattedNumber.Length <= i)
{
throw new ArgumentException(SR.RequiredDigitNotFoundEndOfData, nameof(utf8FormattedNumber));
}
while (i < utf8FormattedNumber.Length && JsonHelpers.IsDigit(utf8FormattedNumber[i]))
{
i++;
}
if (i != utf8FormattedNumber.Length)
{
throw new ArgumentException(
SR.Format(SR.ExpectedEndOfDigitNotFound, ThrowHelper.GetPrintableString(utf8FormattedNumber[i])),
nameof(utf8FormattedNumber));
}
}
internal static void ValidateNumber(ReadOnlySpan <byte> utf8FormattedNumber)
{
// This is a simplified version of the number reader from Utf8JsonReader.TryGetNumber,
// because it doesn't need to deal with "NeedsMoreData", or remembering the format.
if (utf8FormattedNumber.IsEmpty)
{
throw new ArgumentException(SR.RequiredDigitNotFoundEndOfData, nameof(utf8FormattedNumber));
}
int i = 0;
if (utf8FormattedNumber[i] == '-')
{
i++;
if (utf8FormattedNumber.Length <= i)
{
throw new ArgumentException(SR.RequiredDigitNotFoundEndOfData, nameof(utf8FormattedNumber));
}
}
if (utf8FormattedNumber[i] == '0')
{
i++;
}
else
{
while (i < utf8FormattedNumber.Length && JsonHelpers.IsDigit(utf8FormattedNumber[i]))
{
i++;
}
}
if (i == utf8FormattedNumber.Length)
{
return;
}
byte val = utf8FormattedNumber[i];
if (val == '.')
{
i++;
}
else if (val == 'e' || val == 'E')
{
i++;
if (i >= utf8FormattedNumber.Length)
{
throw new ArgumentException(
SR.RequiredDigitNotFoundEndOfData,
nameof(utf8FormattedNumber));
}
val = utf8FormattedNumber[i];
if (val == '+' || val == '-')
{
i++;
}
}
else
{
throw new ArgumentException(
SR.Format(SR.ExpectedEndOfDigitNotFound, ThrowHelper.GetPrintableString(val)),
nameof(utf8FormattedNumber));
}
if (i >= utf8FormattedNumber.Length)
{
throw new ArgumentException(
SR.RequiredDigitNotFoundEndOfData,
nameof(utf8FormattedNumber));
}
while (i < utf8FormattedNumber.Length && JsonHelpers.IsDigit(utf8FormattedNumber[i]))
{
i++;
}
if (i != utf8FormattedNumber.Length)
{
throw new ArgumentException(
SR.Format(SR.ExpectedEndOfDigitNotFound, ThrowHelper.GetPrintableString(utf8FormattedNumber[i])),
nameof(utf8FormattedNumber));
}
}