internal virtual Token next_Token()
{
Token t = new Token();
Symbols symbol = new Symbols();
t.token = -1;
peek = next_char();
do
{
if (peek == ' ' || peek == '\t')
{
continue;
}
else if (peek == '\n')
{
line++;
char_pos = -1;
}
else
{
break;
}
} while (peek == next_char());
if (peek == '$')
{
string @var = "$";
peek = next_char();
while (isLetter(peek))
{
@var += peek;
peek = next_char();
}
input_pos--;
t.token = Tokens.Covert("VAR");
Token s = new Token();
s.token = Tokens.Covert("VAR");
s.value = 0;
s.lexem = @var;
t.value = symbol.add_symbol(s);
return(t);
}
else if (isDigit(peek))
{
int x = 0;
do
{
x = 10 * x + System.identityHashCode(peek);
peek = next_char();
} while (isDigit(peek));
input_pos--;
t.token = Tokens.Covert("NUM");
t.value = x;
return(t);
}
else if (peek == 'p')
{
string print = "print";
for (int i = 0; i < print.Length; i++)
{
if (print[i] == peek)
{
peek = next_char();
}
else
{
t.token = Tokens.Covert("ERR");
return(t);
}
}
t.token = Tokens.Covert("PRINT");
return(t);
}
else if (peek == ';')
{
t.token = Tokens.Covert("EOL");
t.value = 0;
}
else if (peek == '+')
{
t.token = Tokens.Covert("PLUS");
t.value = 0;
}
else if (peek == '=')
{
t.token = Tokens.Covert("EQUALS");
t.value = 0;
}
return(t);
}