[Boost-users] qi::locals

Subject: [Boost-users] qi::locals
From: Xavier Pegenaute (xpegenaute_at_[hidden])
Date: 2010-05-27 10:51:45

Hi,

I would like to do some complex semantic operation, but I am not sure if
it is possible to do with Spirit. At the moment it does'nt compile :-)

I want a rule like this inside a template class with Iterator, and
ActionHandler as template names:

1: qi::rule<
2:   Iterator,
3:   qi::locals<
4:     std::vector<typename ActionHandler::AClass *>, 
5:     typename ActionHandler::BClass> *
6:   >,
7:   skipper
8: > rule1;

later in the grammar I would like something like this:

9:  rule1.name("rule1");
10: rule1 =
11:  (
12:    qi::lit("AClass") >
13:    +(qi::int_ > qi::int_ > qi::char_)[
14:      qi::_a.push_back(phoenix::construct<
15:        typename ActionHandler::AClass>(qi::_1, qi::_2, qi::_3)
16:    ] > 
17:    -(
18:      qi::lit("BClass") >
19:      +(qi::int_ > qi::char_)[qi::_b.addPair(qi::_1, qi::_2)]
20:    )[phoenix::for_each(qi::_a.begin(), qi::_a.end(),
21:       xxx::a_element.setBClass(qi::_b))]
22:  )[phoenix::bind(&ActionHandler::addAClassVector,
23:      phoenix::ref(handler), qi::_a)]
24:  ;

I guess I have some problem with:
- The rule definition, here seems is expecting the rule's attribute type
- Line 14:
  - qi::_a is an actor, does'nt have push_back method
  - construct returns a AClass pointer?
- Line 19, same as befor, qi::_b is an actor without addPair method
- Line 20:
  - is it possible to use for_each?, I guess phoenix can.
  - begin/end qi::_a is an actors not a vector

Some idea to face it?, or may be is too complex and better do it in some
other easier way?

Thanks & Regards.
Xavi.