Boost::Spirit::QiによるWavefront Objファイルのパーサ | Codetter（こーどったー）

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#include <boost/fusion/adapted/struct.hpp>
#include <boost/spirit/include/qi.hpp>
#include <boost/spirit/home/phoenix.hpp>
#include <fstream>
#include "Vector2d.h"
#include "Vector3d.h"
BOOST_FUSION_ADAPT_STRUCT(
    float3d,
    (float, x)
    (float, y)
    (float, z)
);
BOOST_FUSION_ADAPT_STRUCT(
    float2d,
    (float, x)
    (float, y)
);
class ObjFile {
public:
    class Group {
    public:
        std::string name;
        std::string material;
        std::vector<float3d> vertexList;
        std::vector<float3d> normalList;
        std::vector<float2d> texCoordList;
    };
    class Index {
    public:
        u32 vertex, texcoord, normal;
    };
    class Face {
    public:
        Index i1, i2, i3;
    };
    std::string materialFile;
    std::vector<Group> groups;
};
BOOST_FUSION_ADAPT_STRUCT(
    ObjFile,
    (std::string, materialFile)
    (std::vector<ObjFile::Group>, groups)
);
BOOST_FUSION_ADAPT_STRUCT(
    ObjFile::Group,
    (std::string, name)
    (std::string, material)
    (std::vector<float3d>, vertexList)
    (std::vector<float3d>, normalList)
    (std::vector<float2d>, texCoordList)
    (std::vector<ObjFile::Face>, faceList)
);
BOOST_FUSION_ADAPT_STRUCT(
    ObjFile::Index,
    (u32, vertex)
    (u32, texcoord)
    (u32, normal)
);
BOOST_FUSION_ADAPT_STRUCT(
    ObjFile::Face,
    (ObjFile::Index, i1)
    (ObjFile::Index, i2)
    (ObjFile::Index, i3)
);
using namespace boost::spirit;
template <typename Iterator>
class ObjParser : public qi::grammar<Iterator, ObjFile()>
{
    qi::rule<Iterator, float3d()> float3d_;
    qi::rule<Iterator, float2d()> float2d_;
    qi::rule<Iterator, ObjFile::Index()> index;
    qi::rule<Iterator, float3d()> vert_line;
    qi::rule<Iterator, float3d()> normal_line;
    qi::rule<Iterator, float2d()> texcoord_line;
    qi::rule<Iterator, std::string()> group_line;
    qi::rule<Iterator, std::string()> usemtl_line;
    qi::rule<Iterator, std::string()> mtllib_line;
    qi::rule<Iterator, ObjFile::Face()> face_line;
    qi::rule<Iterator> surface_line;
    qi::rule<Iterator> comment_line;
    qi::rule<Iterator, ObjFile::Group()> group;
    qi::rule<Iterator, ObjFile()> start;
public:
    ObjParser()
        : ObjParser::base_type(start)
    {
        using namespace qi;
        namespace phx = boost::phoenix;
        float3d_ %= float_ >> ' ' >> float_ >> ' ' >> float_;
        float2d_ %= float_ >> ' ' >> float_;
        index = eps[_val = phx::construct<ObjFile::Index>()]
                >> uint_[phx::at_c<0>(_val) = qi::_1]
                >> !('/' >> uint_[phx::at_c<1>(_val) = qi::_1]
                    >> !('/' >> uint_[phx::at_c<2>(_val) = qi::_1])
                );
        vert_line %= "v " >> float3d_ >> eol;
        normal_line %= "vn " >> float3d_ >> eol;
        texcoord_line %= "vt " >> float2d_ >> eol;
        group_line %= "g " >> +(char_ - eol) >> eol;
        face_line %= "f " >> index >> ' ' >> index >> ' ' >> index >> eol;
        surface_line = "s " >> *(char_ - eol) >> eol;
        usemtl_line %= "usemtl " >> +(char_ - eol) >> eol;
        mtllib_line %= "mtllib " >> +(char_ - eol) >> eol;
        comment_line = '#' >> *(char_ - eol) >> eol | eol;
        group = eps[_val = phx::construct<ObjFile::Group>()]
                >> group_line[phx::at_c<0>(_val) = qi::_1]
                >> *(
                        usemtl_line[phx::at_c<1>(_val) = qi::_1]
                        | vert_line[phx::push_back(phx::at_c<2>(_val), qi::_1)]
                        | normal_line[phx::push_back(phx::at_c<3>(_val), qi::_1)]
                        | texcoord_line[phx::push_back(phx::at_c<4>(_val), qi::_1)]
                        | comment_line
                );
        start = eps[_val = phx::construct<ObjFile>()]
                >> *(
                    group[phx::push_back(phx::at_c<1>(_val), qi::_1)]
                    | mtllib_line[phx::at_c<0>(_val) = qi::_1]
                    | comment_line
                );
    }
};
int main(int argc, const char** argv) {
    if (argc == 0) {
        std::cout << "require one argument : .obj filepath" << std::endl;
        return -1;
    }
    std::ifstream file(argv[0]);
    std::string source;
    for(char c; !file.eof() && file.get(c); ) {
        source.push_back(c);
    }
    file.close();
    ObjFile value;
    ObjParser<std::string::iterator> parser;
    qi::parse(source.begin(), source.end(), parser, value);
    return 0;
}
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