提神气:用元组向量绑定到struct 《升腾精神》的解析当然是C++的一个独特应用,一个具有陡峭学习曲线的应用。在这种情况下,我试图解析一个包含语法正确的C++列表初始化的字符串,该代码包含 >代码> STD::tuple < /代码>。下面是结构的声明: typedef std::vector<std::tuple<std::string, int>> label_t; struct BulkDataParmas { std::string strUUID; short subcam; long long pts_beg; long long pts_len; long long pts_gap; label_t labels; };

提神气:用元组向量绑定到struct 《升腾精神》的解析当然是C++的一个独特应用,一个具有陡峭学习曲线的应用。在这种情况下,我试图解析一个包含语法正确的C++列表初始化的字符串,该代码包含 >代码> STD::tuple < /代码>。下面是结构的声明: typedef std::vector<std::tuple<std::string, int>> label_t; struct BulkDataParmas { std::string strUUID; short subcam; long long pts_beg; long long pts_len; long long pts_gap; label_t labels; };,c++,parsing,boost,boost-spirit,boost-spirit-qi,C++,Parsing,Boost,Boost Spirit,Boost Spirit Qi,下面是要分析的示例字符串: "{ \"68965363-2d87-46d4-b05d-f293f2c8403b\", 0, 1583798400000000, 86400000000, 600000000, { { \"motorbike\", 5 }, { \"aeroplane\", 6 } } };" 我在回答我自己的问题。我犯了两个错误。首先,规则label的属性类型错误,std::string()而不是std::tuple() 第二个错误是我需要#包括。我发现这只是偶然的,因为这不在

下面是要分析的示例字符串:

"{ \"68965363-2d87-46d4-b05d-f293f2c8403b\", 0, 1583798400000000, 86400000000, 600000000, { { \"motorbike\", 5 }, { \"aeroplane\", 6 } } };"

我在回答我自己的问题。我犯了两个错误。首先,规则
label
的属性类型错误,
std::string()
而不是
std::tuple()

第二个错误是我需要
#包括
。我发现这只是偶然的,因为这不在Spirit 2.5文档中

template <typename Iterator>
struct load_parser : boost::spirit::qi::grammar<Iterator, BulkDataParmas(), boost::spirit::ascii::space_type>
{
    load_parser() : load_parser::base_type(start)
    {
        namespace qi = boost::spirit::qi;
        namespace ascii = boost::spirit::ascii;
        using qi::attr;
        using qi::short_;
        using qi::int_;
        using qi::long_long;
        using qi::lit;
        using qi::xdigit;
        using qi::lexeme;
        using ascii::char_;
        using boost::proto::deep_copy;

        auto hex2_ = deep_copy(xdigit >> xdigit >> xdigit >> xdigit);
        auto hex4_ = deep_copy(hex2_ >> hex2_);
        auto hex6_ = deep_copy(hex4_ >> hex2_);
        auto fmt_  = deep_copy('"' >> hex4_ >> char_('-') >> hex2_ >> char_('-') >> hex2_ >> char_('-') >> hex2_ >> char_('-') >> hex6_ >> '"');
        uuid = qi::as_string[fmt_];

        quoted_string %= lexeme['"' >> +(char_ - '"') >> '"'];

        label = '{' >> quoted_string >> ',' >> int_ >> '}';

        start = '{' >>  uuid >> ',' >> short_ >> ',' >> long_long >> ',' >> long_long >> ',' >> long_long >> ',' >> '{' >> -(label >> *(',' >> label)) >>'}' >> '}';
//        start = '{' >>  uuid >> ',' >> short_ >> ',' >> long_long >> ',' >> long_long >> ',' >> long_long >> '}';
    }

private:

    boost::spirit::qi::rule<Iterator, std::string()> uuid;
    boost::spirit::qi::rule<Iterator, std::string()> quoted_string;
    boost::spirit::qi::rule<Iterator, std::tuple<std::string, int>(), boost::spirit::ascii::space_type> label;
    boost::spirit::qi::rule<Iterator, BulkDataParmas(), boost::spirit::ascii::space_type> start;
};
模板
结构加载语法分析器:boost::spirit::qi::grammar
{
load_parser():load_parser::base_type(开始)
{
名称空间qi=boost::spirit::qi;
名称空间ascii=boost::spirit::ascii;
使用qi::attr;
使用qi::short_u2;;
使用qi::int_;
使用气::龙龙;
使用qi::lit;
使用qi::xdigit;
使用气:词素;
使用ascii::char;
使用boost::proto::deep_copy;
自动hex2=深度复制(xdigit>>xdigit>>xdigit>>xdigit);
自动hex4=深度复制(hex2\u>>hex2\uU);
自动hex6=深度复制(hex4->hex2);
自动fmt=深拷贝('''>>hex4'>>char'-'>>hex2'>>char'-'>>hex2'>>char'-'>>hex2'>>char'-'>>hex2'>>char'-'>>hex6');
uuid=qi::as_字符串[fmt_];
quoted_string%=词素[''''>>+(字符'''')>'''];
label='{'>>引用的字符串>>','>>int'>>'}';
开始=“{'>>uuid>>”、“>>short'>>”、“>>long'>>”、“>>long'>>”、“>>long'>>”、“>>”{'>>-(标签>>*(',“>>标签))>>”}>>”;
//开始=“{'>>uuid>>”、“>>短”、“>>长”、“>>长”、“>>长”、“>>长”>>”;
}
私人:
boost::spirit::qi::rule uuid;
boost::spirit::qi::规则引用\u字符串;
boost::spirit::qi::规则标签;
提升::精神::气::规则开始;
};
测试代码:

void doTestParser2()
{
    for
    (
        auto& input : std::list<std::string>
        {
            "{ \"68965363-2d87-46d4-b05d-f293f2c8403b\", 0, 1583798400000000, 86400000000, 600000000, {  } };",
            "{ \"68965363-2d87-46d4-b05d-f293f2c8403b\", 0, 1583798400000000, 86400000000, 600000000, { { \"motorbike\", 5 } } };",
            "{ \"68965363-2d87-46d4-b05d-f293f2c8403b\", 0, 1583798400000000, 86400000000, 600000000, { { \"motorbike\", 5 }, { \"aeroplane\", 6 } } };"
        }
    )
    {
        using namespace boost::spirit;

        auto f(std::begin(input)), l(std::end(input));
        load_parser<decltype(f)> p;

        try
        {
            BulkDataParmas result { };
            std::string sresult { };
            bool ok = qi::phrase_parse(f, l, p > ';', qi::ascii::space, result);

            if (!ok)
                std::cerr << "invalid input" << std::endl;
            else
            {
                std::cout << "ok: " << input << std::endl;
                std::cout << "UUID:     " << result.strUUID << std::endl;
                std::cout << "subcam:   " << result.subcam << std::endl;
                std::cout << "pts_beg:  " << result.pts_beg << std::endl;
                std::cout << "pts_len:  " << result.pts_len << std::endl;
                std::cout << "pts_gap:  " << result.pts_gap << std::endl;
                for (auto const& tup : result.labels)
                {
                    std::cout << "label:    " << std::get<0>(tup) << std::endl;
                    std::cout << "level:    " << std::get<1>(tup) << std::endl;
                }

            }

        }
        catch (const qi::expectation_failure<decltype(f)>& e)
        {
            std::cerr << "expectation_failure at '" << std::string(e.first, e.last) << "'\n";
        }
    }
}
void doTestParser2()
{
对于
(
自动输入(&I):标准::列表
{
“{68965363-2d87-46d4-b05d-f293f2c8403b\”,01583798400000000086400000000600000000,{};”,
“{68965363-2d87-46d4-b05d-f293f2c8403b\”,01583798400000000086400000000600000000,{{“摩托车”,5}}};“,
“{68965363-2d87-46d4-b05d-f293f2c8403b\”,0158379400000086400000000600000000,{{{“摩托车”,5},{“飞机”,6};”
}
)
{
使用名称空间boost::spirit;
自动f(标准::开始(输入)),l(标准::结束(输入));
加载语法分析器p;
尝试
{
BulkDataParmas结果{};
std::string sresult{};
bool ok=qi::短语解析(f,l,p>“;”,qi::ascii::空格,结果);
如果(!ok)

除了你提到的两件事(正确的),我建议

  • 一些简化:

    uuid = '"' >> qi::raw [
        hex_<4>{} >> qi::repeat(3)['-' >> hex_<2>{}] >> '-' >> hex_<6>{}
    ] >> '"';
    
    在这里,我建议使用
    *
    来接受空字符串(这通常是 引用字符串的“点”,因此我们可以明确表示embdeded 空白或有意为空字符串)。此外,使用
    ~charset
    可以 效率更高

    还删除了
    lexeme[]
    ,因为该规则已在没有跳过程序的情况下声明

  • 结束:

    label = '{' >> quoted_string >> ',' >> qi::int_ >> '}';
    
    start = qi::skip(ascii::space) [ '{'
        >> uuid      >> ','
        >> qi::auto_ >> ','
        >> qi::auto_ >> ','
        >> qi::auto_ >> ','
        >> qi::auto_ >> ','
        >> '{' >> -(label % ',') >> '}'
        >> '}' >> ';'
    ];
    
    请注意,我加入了skipper选项。因此,您不必在
    短语\u parse
    中繁琐地传递正确的内容。skipper通常不是调用者无论如何都应该能够更改的东西

  • 现在,让我们也对改编进行现代化:

    BOOST_FUSION_ADAPT_STRUCT(BulkDataParams, strUUID, subcam, pts_beg, pts_len, pts_gap, labels)
    
    在此之后,您可以以现代方式重新销售类型,而不必冒任何兼容性问题的风险。请注意,这也是您选择在那里的开始规则中使用
    qi::auto \
    的原因,因此,当解析器结果以预期方式隐式转换为目标类型时,您不会感到痛苦的意外

    struct BulkDataParams {
        std::string strUUID;
        int16_t subcam;
        int64_t pts_beg;
        int64_t pts_len;
        int64_t pts_gap;
        label_t labels;
    };
    
  • 现在,让我们加入调试输出和测试主体:

    #define BOOST_SPIRIT_DEBUG
    #include <boost/spirit/include/qi.hpp>
    #include <boost/fusion/adapted/std_tuple.hpp>
    #include <iostream>
    #include <iomanip>
    
    using label_t = std::vector<std::tuple<std::string, int>>;
    
    namespace std {
        std::ostream& operator<<(std::ostream& os, label_t::value_type const& t) {
            auto const& [k,v] = t;
            return os << "[" << std::quoted(k) << "," << v << "]";
        }
    
        std::ostream& operator<<(std::ostream& os, label_t const& m) {
            os << "{";
            for (auto&& el:m) os << el << ",";
            return os << "}";
        }
    }
    
    struct BulkDataParams {
        std::string strUUID;
        int16_t subcam;
        int64_t pts_beg;
        int64_t pts_len;
        int64_t pts_gap;
        label_t labels;
    };
    
    BOOST_FUSION_ADAPT_STRUCT(BulkDataParams, strUUID, subcam, pts_beg, pts_len, pts_gap, labels)
    
    template <typename Iterator> struct load_parser : boost::spirit::qi::grammar<Iterator, BulkDataParams()> {
        load_parser() : load_parser::base_type(start) {
            namespace qi = boost::spirit::qi;
            namespace ascii = boost::spirit::ascii;
    
            uuid = '"' >> qi::raw [
                hex_<4>{} >> qi::repeat(3)['-' >> hex_<2>{}] >> '-' >> hex_<6>{}
            ] >> '"';
    
            quoted_string = '"' >> *~qi::char_('"') >> '"';
    
            label = '{' >> quoted_string >> ',' >> qi::int_ >> '}';
    
            start = qi::skip(ascii::space) [ '{'
                >> uuid      >> ','
                >> qi::auto_ >> ','
                >> qi::auto_ >> ','
                >> qi::auto_ >> ','
                >> qi::auto_ >> ','
                >> '{' >> -(label % ',') >> '}'
                >> '}' >> ';'
            ];
    
            BOOST_SPIRIT_DEBUG_NODES(
                (uuid) (quoted_string) (label) (start)
            )
        }
    
        template<int N> using hex_ = boost::spirit::qi::int_parser<std::intmax_t, 16, 2*N, 2*N>;
    
      private:
        boost::spirit::qi::rule<Iterator, std::string()> uuid;
        boost::spirit::qi::rule<Iterator, std::string()> quoted_string;
        boost::spirit::qi::rule<Iterator, label_t::value_type(), boost::spirit::ascii::space_type> label;
        boost::spirit::qi::rule<Iterator, BulkDataParams()> start;
    };
    
    int main() {
    
        for (std::string const input : {
            R"({ "68965363-2d87-46d4-b05d-f293f2c8403b", 0, 1583798400000000, 86400000000, 600000000, { { "motorbike", 5 }, { "aeroplane", 6 } } };)",
        })
        {
            auto f = begin(input), l = end(input);
            BulkDataParams bdp;
            load_parser<std::string::const_iterator> p;
            if (parse(f, l, p, bdp)) {
                std::cout << "Parsed: " << boost::fusion::as_vector(bdp) << "\n";
            } else {
                std::cout << "Parse Failed\n";
            }
    
            if (f != l) {
                std::cout << "Remaining unparsed: " << std::quoted(std::string(f,l)) << "\n";
            }
        }
    }
    

  • 如何生成调试输出?它是完整列表中的
    #define BOOST\u SPIRIT\u debug
    。在这种情况下,我偷偷地使用了一些
    操作符
    
    BOOST_FUSION_ADAPT_STRUCT(BulkDataParams, strUUID, subcam, pts_beg, pts_len, pts_gap, labels)
    
    struct BulkDataParams {
        std::string strUUID;
        int16_t subcam;
        int64_t pts_beg;
        int64_t pts_len;
        int64_t pts_gap;
        label_t labels;
    };
    
    #define BOOST_SPIRIT_DEBUG
    #include <boost/spirit/include/qi.hpp>
    #include <boost/fusion/adapted/std_tuple.hpp>
    #include <iostream>
    #include <iomanip>
    
    using label_t = std::vector<std::tuple<std::string, int>>;
    
    namespace std {
        std::ostream& operator<<(std::ostream& os, label_t::value_type const& t) {
            auto const& [k,v] = t;
            return os << "[" << std::quoted(k) << "," << v << "]";
        }
    
        std::ostream& operator<<(std::ostream& os, label_t const& m) {
            os << "{";
            for (auto&& el:m) os << el << ",";
            return os << "}";
        }
    }
    
    struct BulkDataParams {
        std::string strUUID;
        int16_t subcam;
        int64_t pts_beg;
        int64_t pts_len;
        int64_t pts_gap;
        label_t labels;
    };
    
    BOOST_FUSION_ADAPT_STRUCT(BulkDataParams, strUUID, subcam, pts_beg, pts_len, pts_gap, labels)
    
    template <typename Iterator> struct load_parser : boost::spirit::qi::grammar<Iterator, BulkDataParams()> {
        load_parser() : load_parser::base_type(start) {
            namespace qi = boost::spirit::qi;
            namespace ascii = boost::spirit::ascii;
    
            uuid = '"' >> qi::raw [
                hex_<4>{} >> qi::repeat(3)['-' >> hex_<2>{}] >> '-' >> hex_<6>{}
            ] >> '"';
    
            quoted_string = '"' >> *~qi::char_('"') >> '"';
    
            label = '{' >> quoted_string >> ',' >> qi::int_ >> '}';
    
            start = qi::skip(ascii::space) [ '{'
                >> uuid      >> ','
                >> qi::auto_ >> ','
                >> qi::auto_ >> ','
                >> qi::auto_ >> ','
                >> qi::auto_ >> ','
                >> '{' >> -(label % ',') >> '}'
                >> '}' >> ';'
            ];
    
            BOOST_SPIRIT_DEBUG_NODES(
                (uuid) (quoted_string) (label) (start)
            )
        }
    
        template<int N> using hex_ = boost::spirit::qi::int_parser<std::intmax_t, 16, 2*N, 2*N>;
    
      private:
        boost::spirit::qi::rule<Iterator, std::string()> uuid;
        boost::spirit::qi::rule<Iterator, std::string()> quoted_string;
        boost::spirit::qi::rule<Iterator, label_t::value_type(), boost::spirit::ascii::space_type> label;
        boost::spirit::qi::rule<Iterator, BulkDataParams()> start;
    };
    
    int main() {
    
        for (std::string const input : {
            R"({ "68965363-2d87-46d4-b05d-f293f2c8403b", 0, 1583798400000000, 86400000000, 600000000, { { "motorbike", 5 }, { "aeroplane", 6 } } };)",
        })
        {
            auto f = begin(input), l = end(input);
            BulkDataParams bdp;
            load_parser<std::string::const_iterator> p;
            if (parse(f, l, p, bdp)) {
                std::cout << "Parsed: " << boost::fusion::as_vector(bdp) << "\n";
            } else {
                std::cout << "Parse Failed\n";
            }
    
            if (f != l) {
                std::cout << "Remaining unparsed: " << std::quoted(std::string(f,l)) << "\n";
            }
        }
    }
    
    <start>
      <try>{ "68965363-2d87-46d</try>
      <uuid>
        <try>"68965363-2d87-46d4-</try>
        <success>, 0, 158379840000000</success>
        <attributes>[[6, 8, 9, 6, 5, 3, 6, 3, -, 2, d, 8, 7, -, 4, 6, d, 4, -, b, 0, 5, d, -, f, 2, 9, 3, f, 2, c, 8, 4, 0, 3, b]]</attributes>
      </uuid>
      <label>
        <try> { "motorbike", 5 },</try>
        <quoted_string>
          <try>"motorbike", 5 }, { </try>
          <success>, 5 }, { "aeroplane"</success>
          <attributes>[[m, o, t, o, r, b, i, k, e]]</attributes>
        </quoted_string>
        <success>, { "aeroplane", 6 }</success>
        <attributes>[[[m, o, t, o, r, b, i, k, e], 5]]</attributes>
      </label>
      <label>
        <try> { "aeroplane", 6 } </try>
        <quoted_string>
          <try>"aeroplane", 6 } } }</try>
          <success>, 6 } } };</success>
          <attributes>[[a, e, r, o, p, l, a, n, e]]</attributes>
        </quoted_string>
        <success> } };</success>
        <attributes>[[[a, e, r, o, p, l, a, n, e], 6]]</attributes>
      </label>
      <success></success>
      <attributes>[[[6, 8, 9, 6, 5, 3, 6, 3, -, 2, d, 8, 7, -, 4, 6, d, 4, -, b, 0, 5, d, -, f, 2, 9, 3, f, 2, c, 8, 4, 0, 3, b], 0, 1583798400000000, 86400000000, 600000000, [[[m, o, t, o, r, b, i, k, e], 5], [[a, e, r, o, p, l, a, n, e], 6]]]]</attributes>
    </start>