good day.
i'm trying to learn spirit 2.x and i'm toying with the grammar as below. could you please help me fixing its errors? thanks in advance!
//start
class ident_decl_node {
//this will enable fusion_adapt_struct to access your private members
template < typename, int>
friend struct boost::fusion::extension::struct_member;
int type;
std::string ident;
};
BOOST_FUSION_ADAPT_STRUCT(
ident_decl_node,
(int, type)
(std::string, ident)
)
class empty{};
typedef std::vector<boost::variant<ident_decl_node, empty> > ScriptNodes;
template <typename Iterator>
struct my_grammar : qi::grammar<Iterator, ScriptNodes(), ascii::space_type> {
struct vartypes_keywords : qi::symbols<char, int> {
vartypes_keywords() {
add
("void", 0)
("string", 1)
("float", 2)
("int", 3)
("bool", 4)
;
}
} vartypes_keywords_;
my_grammar() : my_grammar::base_type(start) {
using phoenix::construct;
using phoenix::at_c;
using phoenix::new_;
using namespace boost::spirit;
using namespace boost::spirit::qi;
using namespace boost::spirit::ascii;
using namespace boost::spirit::arg_names;
using boost::spirit::arg_names::_1;
using boost::spirit::arg_names::_val;
start %= ident_decl >> eps;
ident %= raw[lexeme[((alpha | char_('_')) >> *(alnum | char_('_'))) - vartypes_keywords_]];
ident_decl %= vartypes_keywords_ > ident;
}
qi::rule<Iterator, std::string(), ascii::space_type> ident;
qi::rule<Iterator, ident_decl_node(), ascii::space_type> ident_decl;
qi::rule<Iterator, ScriptNodes(), ascii::space_type> start;
};
//end
i appreciate your help.
