public void Relation(Token op, OsgItem x, OsgItem y)
{
throw new NotImplementedException();
}
internal void Number()
{
sym = Token.Number;
val = 0;
do
{
val *= 10;
val += Int32.Parse(ch.ToString());
ReadChar();
} while (ch.IsNumeric());
}
internal void Ident()
{
id = "";
int i = 0;
do
{
if (i < IdLen)
{
id += ch;
i++;
}
ReadChar();
} while (ch.IsAlphaNum());
if (keyTable.ContainsKey(id))
sym = keyTable[id];
else
sym = Token.Ident;
}
internal Token Get()
{
while (!Eof() && (ch == ' ' || ch == '\n' || ch == '\r'))
{
ReadChar();
}
if (Eof())
{
sym = Token.Eof;
}
else if (ch == '&')
{
ReadChar();
sym = Token.And;
}
else if (ch == '*')
{
ReadChar();
sym = Token.Times;
}
else if (ch == '+')
{
ReadChar();
sym = Token.Plus;
}
else if (ch == '-')
{
ReadChar();
sym = Token.Minus;
}
else if (ch == '=')
{
ReadChar();
sym = Token.Eql;
}
else if (ch == '#')
{
ReadChar();
sym = Token.Neq;
}
else if (ch == '<')
{
ReadChar();
if (ch == '=')
{
ReadChar();
sym = Token.Leq;
}
else
sym = Token.Lss;
}
else if (ch == '>')
{
ReadChar();
if (ch == '=')
{
sym = Token.Geq;
}
else
sym = Token.Gtr;
}
else if (ch == ';')
{
ReadChar();
sym = Token.Semicolon;
}
else if (ch == ',')
{
ReadChar();
sym = Token.Comma;
}
else if (ch == ':')
{
ReadChar();
if (ch == '=')
{
ReadChar();
sym = Token.Becomes;
}
else
sym = Token.Colon;
}
else if (ch == '.')
{
ReadChar();
sym = Token.Period;
}
else if (ch == '(')
{
ReadChar();
if (ch == '*')
{
Comment();
sym = Get();
}
else
{
sym = Token.Lparen;
}
}
else if (ch == ')')
{
ReadChar();
sym = Token.Rparen;
}
else if (ch == '[')
{
ReadChar();
sym = Token.Lbrak;
}
else if (ch == ']')
{
ReadChar();
sym = Token.Rbrak;
}
else if (ch.IsNumeric())
{
Number();
}
else if (ch.IsAlpha())
{
Ident();
}
else if (ch == '~')
{
ReadChar();
sym = Token.Not;
}
else
{
ReadChar();
sym = Token.Null;
}
return sym;
}
public void EnterKW(Token token, string name)
{
keyTable.Add(name, token);
}
private void NextToken()
{
sym = scanner.Get();
}