Thank you for the suggestion to use raw[] it did give me the result I was going for (as shown below). But, qi::raw [+digit_[qi::_a = qi::_1]] never returned from the parse attempt.
string ("*ARSS") >> colon >> // Initial response
qi::raw [qi::int_[qi::_a = qi::_1]] >> crlf >> // Number of discovered devices - save in local qi::_a, output the raw text as well
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]
…blah, blah…
)
] >>
qi::attr(qi::_b); // Emit the "OK" here
This bumbling native is in awe of such god-like magic,
SGL
From: Boost-users [mailto:boost-users-bounces@lists.boost.org] On Behalf Of TONGARI J
Sent: Friday, September 20, 2013 9:50 PM
To: boost-users@lists.boost.org
Subject: Re: [Boost-users] Newbie boost::spirit rule semantic action question
2013/9/21 LeMay.Steve <Steve.Lemay@igt.com>
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::vector<std::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::rule<Iter, std::vector<std::string>(), boost::spirit::qi::locals<int, std::string>> 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”.
Because int_ returns "int" which is not comatible with "string".
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).
Try qi::raw[], it'll give you a range which is string-compatible.
HTH