static private Token ExpandVariable(CharReader reader, StringBuilder literal, IResolver resolver)
{
char c;
while (reader.Next())
{
c = reader.Current;
if (char.IsLetterOrDigit(c))
{
literal.Append(c);
}
else
{
if (literal.ToString() == "true")
{
return(true);
}
else if (literal.ToString() == "false")
{
return(false);
}
else if (char.IsWhiteSpace(c))
{
continue;
}
else if (c == '(')
{
string name = literal.ToString();
literal.Length = 0;
reader.Read(); // skip the char
Token[] args = ExpandParameters(reader, literal, resolver);
Token result = resolver.HandleFunction(name, args);
return(result);
}
else
{
Token result = resolver.HandleVariable(literal.ToString());
return(result);
}
}
reader.Read();
}
return(Token.Null);
}