public Token next(Mode mode)
{
Char ch = nextChar();
switch (mode)
{
case Mode.DTEXT:
if (isDText(ch))
curToken = lexDText();
else if (isFWS(ch))
curToken = lexFWS();
else if (ch == ']')
curToken = new Token(Token.Type.RBRACKET, "]");
else
throw new LexerException("Unexpected character in " + mode + " mode: " + ch);
break;
case Mode.DEFAULT:
switch (ch)
{
case Char.MinValue: curToken = new Token(Token.Type.EOS, ""); break;
case '(': curToken = lexComment(); break;
case '\r': curToken = lexCRLForFWS(); break;
case ' ': case '\t': curToken = lexFWS(); break;
//case '\\': return lexQuotedChar();
case '"': curToken = lexQuotedString(); break;
case '<': curToken = new Token(Token.Type.LESS, "<"); break;
case '>': curToken = new Token(Token.Type.GREAT, ">"); break;
case '@': curToken = new Token(Token.Type.AT, "@"); break;
case ',': curToken = new Token(Token.Type.COMMA, ","); break;
case ';': curToken = new Token(Token.Type.SEMICOLON, ";"); break;
case ':': curToken = new Token(Token.Type.COLON, ":"); break;
case '[': curToken = new Token(Token.Type.LBRACKET, "["); break;
case ']': curToken = new Token(Token.Type.RBRACKET, "]"); break;
default:
if (isAtomChar(ch))
{
curToken = lexDotAtom(); // dot-atom allowed?
break;
}
else
throw new LexerException("Unrecognized token at '" + curChar() + "'");
}
break;
//if (0x21 < curChar && curChar < 0x7e) return new Token(Token.Type.VChar);
}
return curToken;
}
internal void expectCurrent(Token.Type type)
{
if (curToken.type != type)
throw new LexerException("Unexpected token " + curToken.type + " while expected " + type);
}