Brand-newbie boost::spirit::qi question. MSVS2012, boost 1.54
I have a response from a serial device that provides with 0 or more "profiles" in a given character format. I want to capture the number of profile responses in the list (semantic action) as well as have the value into the final result (std::vectorstd::string). How do I properly express this?
Given the input.... (in this case, there are zero profiles returned)
*ARSS:0<CR><LF>OK<CR><LF>
Expect a vector of strings containing "*ARSS" "0" "OK"
This sub-rule fails to return... (Not failing to parse)
boost::spirit::qi::rulestd::string(), boost::spirit::qi::locals> service_search_list;
service_search_list %= // %= operator is necessary for attribute propagation when using symantic attributes (anything in [ ])
string ("*ARSS") >> colon >> // Initial response
+digit [qi::_a = qi::_1] >> crlf >> // Number of discovered devices - save in local qi::_a
qi::omit [ok [qi::_b = qi::_1]] >> // Match but don't emit the "OK" here - save it for the end
qi::repeat (qi::_a) // Repeat for each discovered device
[
crlf >>
(
qi::hold [profile1]
| qi::hold [profile2]
...
)
] >>
qi::attr(qi::_b); // Emit the "OK" here at the end of the list
Using qi::int_[qi::_a = qi::_1] provides and empty string "" in the result and not "0".
If I omit the numeric input from the result... qi::omit [qi::int_[qi::_a = qi::_1]] the parse will succeed but number of items in the response list is lost in the final result (omitted as requested).
Any suggestion is appreciated, I'm stumped.
