private DescriptorToken Supply()
{
if (Current == '\0')
{
var span = new TextSpan(_position, _position);
var token = new DescriptorToken(span, DescriptorTokenKind.EndOfFile, ReadOnlyMemory <char> .Empty);
return(token);
}
if (Special.Contains(Current))
{
return(SingleCharacter());
}
int start = _position;
while (!Special.Contains(Current) && _position < _text.Length)
{
Next();
}
return(CreateIdentifierToken(start));
}
/// <summary>
/// Throws a <see cref="DescriptorParserException"/> with an unexpected token message.
/// </summary>
/// <param name="token">The <see cref="DescriptorToken"/> that wasn't expected.</param>
/// <param name="expected">The token that was expected.</param>
public static void ThrowUnexpectedToken(DescriptorToken token, DescriptorTokenKind expected) =>
throw new DescriptorParserException($"Unexpected token <{token.Kind}>, expected <{expected}>.");
