private void EatRawValue()
{
string rawValue = EatNonWhitespace();
_currentToken = new Token(TokenKind.Value, rawValue, _position);
}
private void EatOption()
{
++_position;
string option = EatNonWhitespace();
if (option.Length == 0)
{
_currentToken = new Token(TokenKind.Error, "No option name specified", _position);
}
else if (option[0] == '-')
{
if (option.Length == 1)
{
_currentToken = new Token(TokenKind.Error, "No option name specified", _position);
}
else
{
_currentToken = new Token(TokenKind.LongOption, option.Substring(1), _position);
}
}
else if (option.Length == 1)
{
_currentToken = new Token(TokenKind.ShortOption, option, _position);
}
else
{
_currentToken = new Token(TokenKind.Error, "Short option name must be a single character", _position);
}
}
private void EatQuotedValue()
{
string quotedValue = "";
++_position;
while (!AtEnd && CurrentChar != '"')
{
quotedValue += CurrentChar;
++_position;
}
if (CurrentChar == '"')
++_position; // Skip trailing " if we saw it (might be we skipped the loop completely)
_currentToken = new Token(TokenKind.Value, quotedValue, _position);
}
private void Advance()
{
EatWhitespace();
if (AtEnd)
{
_currentToken = null;
return;
}
if (CurrentChar == '"')
{
EatQuotedValue();
}
else if (CurrentChar == '-')
{
if (CanPeek && Char.IsDigit(PeekNextChar))
{
// It's actually a negative number, not an option
EatRawValue();
}
else
{
EatOption();
}
}
else
{
EatRawValue();
}
EatWhitespace();
}