在boost spirit中将分隔符传递给子规则
这是我在这里提到的问题的继续 我想将该规则包装到另一个规则中,并在这样做时,将column指令传递给子规则,但我无法找出正确的方法 下面是代码在boost spirit中将分隔符传递给子规则,boost,boost-spirit,boost-spirit-karma,Boost,Boost Spirit,Boost Spirit Karma,这是我在这里提到的问题的继续 我想将该规则包装到另一个规则中,并在这样做时,将column指令传递给子规则,但我无法找出正确的方法 下面是代码 #include <boost/spirit/include/karma.hpp> #include <boost/fusion/include/struct.hpp> #include <boost/fusion/include/nview.hpp> ///////////////////////////////
#include <boost/spirit/include/karma.hpp>
#include <boost/fusion/include/struct.hpp>
#include <boost/fusion/include/nview.hpp>
///////////////////////////////////////////////////////////////////////////////
namespace client
{
struct BoxData
{
int num;
std::string datatype;
std::string dataname;
std::string inputicon;
};
struct Box
{
std::vector<BoxData> box_data;
};
typedef std::back_insert_iterator<std::string> iterator_type;
}
BOOST_FUSION_ADAPT_STRUCT(
client::BoxData,
// (int, num)
(std::string, datatype)
(std::string, dataname)
(std::string, inputicon)
)
BOOST_FUSION_ADAPT_STRUCT(
client::Box,
(std::vector<client::BoxData>, box_data)
)
///////////////////////////////////////////////////////////////////////////////
int main()
{
// some employees
std::vector<client::BoxData> const employees{
{25, "int", "sra_command", "fa fa-wrench"},
{26, "float", "swt_command", "fa fa-wrench"},
{27, "double", "msc_command", "fa fa-mobile"},
{28, "int", "sra_command", "fa fa-wrench"},
{29, "float", "swt_command", "fa fa-wrench"},
{30, "double", "msc_command", "fa fa-mobile"},
{31, "int", "sra_command", "fa fa-wrench"},
{32, "float", "swt_command", "fa fa-wrench"},
{33, "double", "msc_command", "fa fa-mobile"},
};
client::Box box;
///TODO prevent copying of the vector
box.box_data = employees;
// now print them all
std::string generated;
{
using namespace boost::spirit::karma;
using Sink = client::iterator_type;
using BoxDataAttr = client::BoxData;
using BoxAttr = client::Box;
rule<Sink, BoxDataAttr(),space_type> small_box = "<B>" << string << "<1>" << string << "<2>" << string << "<3>";
rule<Sink , BoxAttr()> big_box = "<Start>" << *small_box << "<End>" ;
generate(Sink(generated),[big_box],box);
}
std::cout << generated << std::endl;
}
分隔符,以便将列分隔符应用于小方框规则
因此,预期输出变为
<Start><B>int<1>sra_command<2>fa fa-wrench<3><B>float<1>swt_command<2>fa fa-wrench<3>delimiter
<B>double<1>msc_command<2>fa fa-mobile<3><B>int<1>sra_command<2>fa fa-wrench<3>delimiter
<B>float<1>swt_command<2>fa fa-wrench<3><B>double<1>msc_command<2>fa fa-mobile<3>delimiter
<B>int<1>sra_command<2>fa fa-wrench<3><B>float<1>swt_command<2>fa fa-wrench<3>delimiter
<B>double<1>msc_command<2>fa fa-mobile<3>delimiter<End>
下面的用例促使我寻找解析器/生成器解决方案。我不太确定您的问题的原因,但在我看来,昨天的解决方案仍然有效:
rule<Sink, BoxDataAttr()> small_box = "<B>" << string << "<1>" << string << "<2>" << string << "<3>";
rule<Sink, BoxAttr()> big_box = "<Start>" << columns(4, "delimiter\n") [small_box % eol] << "<End>" ;
generate(Sink(generated), big_box, employees);
更一般地说,移动语义可以用于:
box.box_data = std::move(employees);
为手头的问题添加了一些背景信息关于添加的背景,我要说的是,直接在Fusion的基础上实现一个数量级将更容易。它可以为您提供它的“反射”部分,您可以使用它来驱动常规的泛型编程。关于数据结构驱动的生成,也可以从中获得灵感。关于模板扩展样式生成(HTML),还可以看看库,比如最后,看看protobuf+grpc之类的库,以获得关于(JSON)rpc调用和从服务定义生成的服务的启示。我知道你参加了这个练习,但是好的练习是从计划和查看现有知识开始的:)谢谢你的反馈。我一定会调查的。我曾计划在RCP类和服务中使用apache thrift,但这看起来更好。在实际工作之前,我必须更好地规划我的项目:)
struct Data1
{
int command_one output "fa fa-wrench";
float commmand_two output "fa fa-sensor";
}
struct Data2
{
bool a input switch;
int b input progress_bar {0,100} ;
}
rule<Sink, BoxDataAttr()> small_box = "<B>" << string << "<1>" << string << "<2>" << string << "<3>";
rule<Sink, BoxAttr()> big_box = "<Start>" << columns(4, "delimiter\n") [small_box % eol] << "<End>" ;
generate(Sink(generated), big_box, employees);
client::Box const employees { {
{25, "int", "sra_command", "fa fa-wrench"},
{26, "float", "swt_command", "fa fa-wrench"},
{27, "double", "msc_command", "fa fa-mobile"},
{28, "int", "sra_command", "fa fa-wrench"},
{29, "float", "swt_command", "fa fa-wrench"},
{30, "double", "msc_command", "fa fa-mobile"},
{31, "int", "sra_command", "fa fa-wrench"},
{32, "float", "swt_command", "fa fa-wrench"},
{33, "double", "msc_command", "fa fa-mobile"},
} };
box.box_data = std::move(employees);