c – boost :: qi :: parse似乎导致编译错误
作者：互联网
我正在尝试使用Boost :: Spirit编写解析器,并且我编写了解析器并进行了编译.问题是,当我尝试编译解析函数时,编译器会抛出一堆模板错误.这是Qi语法：
template<typename Iterator>
struct etf_parser : qi::grammar<Iterator, std::map<std::string, etfnode>(), ascii::space_type> {
etf_parser() : etf_parser::base_type(start) {
using qi::int_;
using qi::lit;
using qi::double_;
using qi::bool_;
using qi::lexeme;
using ascii::char_;
quoted_string %= lexeme['"' >> +(char_ - '"') >> '"'];
dataVal %= (quoted_string | double_ | int_ | bool_ | listObj | pairObj | mapObj);
pairObj %= ('<' >> dataVal >> ',' >> dataVal >> '>');
listObj %= '{' >> dataVal % ',' >> '}';
mapKey %= +qi::char_("a-zA-Z_-0-9.");
mapPair %= mapKey >> lit('=') >> dataVal;
mapObj %= '(' >> mapPair % ',' >> ')';
start %= mapPair >> ';';
}
qi::rule<Iterator, std::string(), ascii::space_type> quoted_string;
// Data value parsers
qi::rule<Iterator, etfnode(), ascii::space_type> dataVal;
qi::rule<Iterator, std::vector<etfnode>(), ascii::space_type> listObj;
qi::rule<Iterator, std::pair<etfnode, etfnode>(), ascii::space_type> pairObj;
qi::rule<Iterator, std::map<std::string, etfnode>(), ascii::space_type> mapObj;
qi::rule<Iterator, std::pair<std::string, etfnode>(), ascii::space_type> mapPair;
qi::rule<Iterator, std::string(), ascii::space_type> mapKey;
qi::rule<Iterator, std::map<std::string, etfnode>(), ascii::space_type> start;
};
这是解析功能.当我注释掉qi :: parse调用时,代码编译正常：
ETFDocument::ETFDocument(std::string content) {
etf_parser<std::string::const_iterator> parser;
std::map<std::string, rwnode> results;
std::string::const_iterator begin = content.begin();
std::string::const_iterator end = content.end();
bool result = qi::parse(begin, end, parser, results);
if(result) printf("Parsing succeeded\n"); else printf("Parsing failed\n");
m_root = etfnode(results);
}
我尝试编译时编译器吐出以下错误：
In file included from /usr/include/boost/spirit/home/qi/nonterminal.hpp:14:0,
from /usr/include/boost/spirit/home/qi.hpp:20,
from /usr/include/boost/spirit/include/qi.hpp:16,
from libmcg/etf.cpp:8:
/usr/include/boost/spirit/home/qi/nonterminal/rule.hpp: In instantiation of ‘bool boost::spirit::qi::rule<Iterator, T1, T2, T3, T4>::parse(Iterator&, const Iterator&, Context&, const Skipper&, Attribute&) const [with Context = boost::spirit::context<boost::fusion::cons<std::map<std::basic_string<char>, boost::recursive_wrapper<ETFDocument::etfnode> >&, boost::fusion::nil>, boost::spirit::locals<> >; Skipper = boost::spirit::unused_type; Attribute = std::map<std::basic_string<char>, boost::recursive_wrapper<ETFDocument::etfnode> >; Iterator = __gnu_cxx::__normal_iterator<const char*, std::basic_string<char> >; T1 = std::map<std::basic_string<char>, boost::recursive_wrapper<ETFDocument::etfnode> >(); T2 = boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<boost::spirit::tag::char_code<boost::spirit::tag::space, boost::spirit::char_encoding::ascii> >, 0l>; T3 = boost::spirit::unused_type; T4 = boost::spirit::unused_type]’:
/usr/include/boost/spirit/home/qi/reference.hpp:43:71: required from ‘bool boost::spirit::qi::reference<Subject>::parse(Iterator&, const Iterator&, Context&, const Skipper&, Attribute&) const [with Iterator = __gnu_cxx::__normal_iterator<const char*, std::basic_string<char> >; Context = boost::spirit::context<boost::fusion::cons<std::map<std::basic_string<char>, boost::recursive_wrapper<ETFDocument::etfnode> >&, boost::fusion::nil>, boost::spirit::locals<> >; Skipper = boost::spirit::unused_type; Attribute = std::map<std::basic_string<char>, boost::recursive_wrapper<ETFDocument::etfnode> >; Subject = const boost::spirit::qi::rule<__gnu_cxx::__normal_iterator<const char*, std::basic_string<char> >, std::map<std::basic_string<char>, boost::recursive_wrapper<ETFDocument::etfnode> >(), boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<boost::spirit::tag::char_code<boost::spirit::tag::space, boost::spirit::char_encoding::ascii> >, 0l>, boost::spirit::unused_type, boost::spirit::unused_type>]’
/usr/include/boost/spirit/home/qi/parse.hpp:86:82: required from ‘bool boost::spirit::qi::parse(Iterator&, Iterator, const Expr&, Attr&) [with Iterator = __gnu_cxx::__normal_iterator<const char*, std::basic_string<char> >; Expr = etf_parser<__gnu_cxx::__normal_iterator<const char*, std::basic_string<char> > >; Attr = std::map<std::basic_string<char>, boost::recursive_wrapper<ETFDocument::etfnode> >]’
libmcg/etf.cpp:113:53: required from here
/usr/include/boost/spirit/home/qi/nonterminal/rule.hpp:303:17: error: no match for call to ‘(const function_type {aka const boost::function<bool(__gnu_cxx::__normal_iterator<const char*, std::basic_string<char> >&, const __gnu_cxx::__normal_iterator<const char*, std::basic_string<char> >&, boost::spirit::context<boost::fusion::cons<std::map<std::basic_string<char>, boost::recursive_wrapper<ETFDocument::etfnode> >&, boost::fusion::nil>, boost::fusion::vector0<> >&, const boost::spirit::qi::char_class<boost::spirit::tag::char_code<boost::spirit::tag::space, boost::spirit::char_encoding::ascii> >&)>}) (__gnu_cxx::__normal_iterator<const char*, std::basic_string<char> >&, const __gnu_cxx::__normal_iterator<const char*, std::basic_string<char> >&, boost::spirit::qi::rule<__gnu_cxx::__normal_iterator<const char*, std::basic_string<char> >, std::map<std::basic_string<char>, boost::recursive_wrapper<ETFDocument::etfnode> >(), boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<boost::spirit::tag::char_code<boost::spirit::tag::space, boost::spirit::char_encoding::ascii> >, 0l>, boost::spirit::unused_type, boost::spirit::unused_type>::context_type&, const boost::spirit::unused_type&)’
In file included from /usr/include/boost/function/detail/maybe_include.hpp:33:0,
from /usr/include/boost/function/detail/function_iterate.hpp:14,
from /usr/include/boost/preprocessor/iteration/detail/iter/forward1.hpp:67,
from /usr/include/boost/function.hpp:64,
from /usr/include/boost/spirit/home/qi/nonterminal/rule.hpp:16,
from /usr/include/boost/spirit/home/qi/nonterminal.hpp:14,
from /usr/include/boost/spirit/home/qi.hpp:20,
from /usr/include/boost/spirit/include/qi.hpp:16,
from libmcg/etf.cpp:8:
/usr/include/boost/function/function_template.hpp:1021:7: note: candidate is:
/usr/include/boost/function/function_template.hpp:754:17: note: boost::function4<R, T1, T2, T3, T4>::result_type boost::function4<R, T1, T2, T3, T4>::operator()(T0, T1, T2, T3) const [with R = bool; T0 = __gnu_cxx::__normal_iterator<const char*, std::basic_string<char> >&; T1 = const __gnu_cxx::__normal_iterator<const char*, std::basic_string<char> >&; T2 = boost::spirit::context<boost::fusion::cons<std::map<std::basic_string<char>, boost::recursive_wrapper<ETFDocument::etfnode> >&, boost::fusion::nil>, boost::fusion::vector0<> >&; T3 = const boost::spirit::qi::char_class<boost::spirit::tag::char_code<boost::spirit::tag::space, boost::spirit::char_encoding::ascii> >&; boost::function4<R, T1, T2, T3, T4>::result_type = bool]
/usr/include/boost/function/function_template.hpp:754:17: note: no known conversion for argument 4 from ‘const boost::spirit::unused_type’ to ‘const boost::spirit::qi::char_class<boost::spirit::tag::char_code<boost::spirit::tag::space, boost::spirit::char_encoding::ascii> >&’
据我所知,它正在寻找一个船长,但转而使用boost :: spirit :: unused_type.我不确定为什么会发生这种情况,因为我在解析器定义中指定了一个Skipper.我在gcc 4.7.1上使用boost v1.49.0.
编辑：这是etfnode的定义.在cpp文件的开头(包含其他代码片段)有一个typedef,它将“etfnode”别名为“rwnode”.
enum DataType {
DT_INT,
DT_STRING,
DT_FLOAT,
DT_BOOL,
DT_LIST,
DT_PAIR,
DT_MAP
};
struct etfnode;
typedef boost::recursive_wrapper<etfnode> rwnode;
typedef boost::variant<
int,
std::string,
double,
bool,
std::vector<rwnode>,
std::pair<rwnode, rwnode>,
std::map<std::string, rwnode> > etfvalue;
struct etfnode {
DataType type;
etfvalue value;
etfnode(const std::string& s);
etfnode(const int i);
etfnode(const double d);
etfnode(const bool b);
etfnode(const std::vector<rwnode>& n);
etfnode(const std::pair<rwnode, rwnode>& p);
etfnode(const std::map<std::string, rwnode>& p);
etfnode();
};
还有一个测试字符串：
foo = 6;
bar = <"bar", 16.5>;
baz = {
(
foobar = "foo",
bar = 12
),
"foobar"
};
解决方法:
我认为最重要的罪魁祸首是你使用qi :: parse而不是qi :: phrase_parse这一事实,而你的语法明确地使用了一个队长.
我还重写了etfvalue递归变体的定义.我不确定你的版本是否应该有效,但至少现在,你可以在你期望的所有地方使用etfnode.这样看起来对我来说更加一致.
这是为我编译好的代码.它使用以下输出解析示例输入(请参阅main())：
Parsing succeeded
Unparsed remaining: ';'
如果你真的想接受尾随;,修改主要规则更像
start = *(mapPair >> ';'); // or *(mapPair >> (';'|qi::eoi))
祝好运！
//add streaming operators for etfnode and etfvalue if you want to debug this:
//#define BOOST_SPIRIT_DEBUG
#include <map>
#include <string>
#include <boost/variant/recursive_wrapper.hpp>
#include <boost/spirit/include/qi.hpp>
#include <boost/fusion/adapted.hpp>
namespace qi = boost::spirit::qi;
namespace ascii = boost::spirit::ascii;
enum DataType {
DT_INT,
DT_STRING,
DT_FLOAT,
DT_BOOL,
DT_LIST,
DT_PAIR,
DT_MAP
};
struct etfnode;
typedef boost::variant<
int,
std::string,
double,
bool,
boost::recursive_wrapper<std::vector<etfnode> >,
boost::recursive_wrapper<std::pair<etfnode, etfnode> >,
boost::recursive_wrapper<std::map<std::string, etfnode> >
> etfvalue;
struct etfnode {
DataType type;
etfvalue value;
etfnode(const std::string& s) { value = s; type = DT_STRING; }
etfnode(const int i) { value = i; type = DT_INT; }
etfnode(const double d) { value = d; type = DT_FLOAT; }
etfnode(const bool b) { value = b; type = DT_BOOL; }
etfnode(const std::vector<etfnode>& n) { value = n; type = DT_LIST; }
etfnode(const std::pair<etfnode, etfnode>& p) { value = p; type = DT_PAIR; }
etfnode(const std::map<std::string, etfnode>& p) { value = p; type = DT_MAP; }
etfnode() { }
};
template<typename Iterator>
struct etf_parser : qi::grammar<Iterator, std::map<std::string, etfnode>(), ascii::space_type> {
etf_parser() : etf_parser::base_type(start) {
using qi::int_;
using qi::lit;
using qi::double_;
using qi::bool_;
using qi::lexeme;
using ascii::char_;
quoted_string = lexeme['"' >> +(char_ - '"') >> '"'];
dataVal = (quoted_string | double_ | int_ | bool_
| listObj | pairObj
| mapObj
);
listObj = '{' >> dataVal % ',' >> '}';
pairObj = lit('<') >> dataVal >> ',' >> dataVal >> '>';
mapKey = +qi::char_("a-zA-Z_-0-9.");
mapPair = mapKey >> lit('=') >> dataVal;
mapObj = '(' >> mapPair % ',' >> ')';
start = mapPair % ';';
BOOST_SPIRIT_DEBUG_NODE(quoted_string);
BOOST_SPIRIT_DEBUG_NODE(dataVal);
BOOST_SPIRIT_DEBUG_NODE(listObj);
//BOOST_SPIRIT_DEBUG_NODE(pairObj);
BOOST_SPIRIT_DEBUG_NODE(mapObj);
BOOST_SPIRIT_DEBUG_NODE(mapKey);
BOOST_SPIRIT_DEBUG_NODE(mapPair);
BOOST_SPIRIT_DEBUG_NODE(start);
}
qi::rule<Iterator, std::string(), ascii::space_type> quoted_string;
// Data value parsers
qi::rule<Iterator, etfnode(), ascii::space_type> dataVal;
qi::rule<Iterator, std::vector<etfnode>(), ascii::space_type> listObj;
qi::rule<Iterator, std::pair<etfnode, etfnode>(), ascii::space_type> pairObj;
qi::rule<Iterator, std::map<std::string, etfnode>(), ascii::space_type> mapObj;
qi::rule<Iterator, std::pair<std::string, etfnode>(), ascii::space_type> mapPair;
qi::rule<Iterator, std::string(), ascii::space_type> mapKey;
qi::rule<Iterator, std::map<std::string, etfnode>(), ascii::space_type> start;
};
int main()
{
etf_parser<std::string::const_iterator> parser;
std::map<std::string, etfnode> results;
std::string content = "foo = 6;\n"
"bar = <\"bar\", 16.5>;\n"
"baz = {\n"
" (\n"
" foobar = \"foo\",\n"
" bar = 12\n"
" ),\n"
" \"foobar\"\n"
"};";
std::string::const_iterator begin = content.begin();
std::string::const_iterator end = content.end();
bool result = qi::phrase_parse(begin, end, parser, ascii::space, results);
if(result) printf("Parsing succeeded\n"); else printf("Parsing failed\n");
if (begin!=end)
std::cout << "Unparsed remaining: '" << std::string(begin,end) << "'\n";
//m_root = etfnode(results);
}
标签：c,compiler-errors,boost,boost-spirit 来源： https://codeday.me/bug/20190902/1787477.html