I'm trying to write a parser for Open Inventor .iv files using boost::spirit.
I have the following struct for VertexProperty nodes:
struct VertexProperty
{
std::vector<std::vector<float> > vertices;
std::vector<std::vector<float> > normals;
std::vector<std::vector<float> > texCoords;
};
BOOST_FUSION_ADAPT_STRUCT(
VertexProperty,
(std::vector<std::vector<float> >, vertices)
(std::vector<std::vector<float> >, normals)
(std::vector<std::vector<float> >, texCoords)
)
And the following rule for parsing it (which doesn't compile):
qi::rule<Iterator, VertexProperty(), Skipper> RULE_VertexProperty;
RULE_VertexProperty = lit("VertexProperty")
>> char_('{')
>> lit("vertex") >> char_('[')
>> repeat(3)[qi::float_] >> *(char_(',') >> repeat(3)[qi::float_])
>> char_(']')
>> lit("normal") >> char_('[')
>> repeat(3)[qi::float_] >> *(char_(',') >> repeat(3)[qi::float_])
>> char_(']')
>> lit("texCoord") >> char_('[')
>> repeat(2)[qi::float] >> *(char_(',') >> repeat(2)[qi::float_])
>> char_(']') >> char_('}');
Based on this rule, the following should result in a valid VertexProperty parse:
VertexProperty {
vertex [ 0.0 0.0 1.0,
1.0 1.0 1.0,
1.0 0.0 1.0]
normal [1.0 0.0 0.0,
0.0 1.0 0.0,
0.0 0.0 1.0]
texCoord [0.0 0.0,
1.0 0.0,
1.0 1.0]
}
My assumption is that the problem is coming from how I'm trying to parse the comma separated tuples into a vector of a vector.
What is the correct way to parse a list of 3-tuples and or 2-tuples of the form:
[float float float, float float float, float float float]
using boost::spirit?
EDIT I misread the question. Here's the rewrite:
Live On Coliru (with debug output)
struct V2 { float a, b; } ;
struct V3 { float a, b, c; } ;
struct VertexProperty {
std::vector<V3> vertices, normals;
std::vector<V2> texCoords;
};
BOOST_FUSION_ADAPT_STRUCT(V2, a,b)
BOOST_FUSION_ADAPT_STRUCT(V3, a,b,c)
BOOST_FUSION_ADAPT_STRUCT(VertexProperty, vertices,normals,texCoords)
template <typename Iterator>
struct Parser : qi::grammar<Iterator, VertexProperty()> {
Parser() : Parser::base_type(start) {
v2 = qi::double_ >> qi::double_;
v3 = qi::double_ >> qi::double_ >> qi::double_;
vertexproperty = qi::lit("VertexProperty")
>> '{'
>> "vertex" >> '[' >> (v3 % ',') >> ']'
>> "normal" >> '[' >> (v3 % ',') >> ']'
>> "texCoord" >> '[' >> (v2 % ',') >> ']'
>> '}';
start = qi::skip(qi::space) [vertexproperty];
BOOST_SPIRIT_DEBUG_NODES((v2)(v3)(vertexproperty))
}
private:
qi::rule<Iterator, VertexProperty()> start;
qi::rule<Iterator, VertexProperty(), qi::space_type> vertexproperty;
qi::rule<Iterator, V2(), qi::space_type> v2;
qi::rule<Iterator, V3(), qi::space_type> v3;
};
Notes:
qi::lit) instead of qi::char_ because you do not want to expose the matched interpunctiona % b matches a [b a]... already)//#define BOOST_SPIRIT_DEBUG
#include <boost/spirit/include/qi.hpp>
#include <boost/fusion/adapted/struct.hpp>
namespace qi = boost::spirit::qi;
struct V2 { float a, b; } ;
struct V3 { float a, b, c; } ;
struct VertexProperty {
std::vector<V3> vertices, normals;
std::vector<V2> texCoords;
};
BOOST_FUSION_ADAPT_STRUCT(V2, a,b)
BOOST_FUSION_ADAPT_STRUCT(V3, a,b,c)
BOOST_FUSION_ADAPT_STRUCT(VertexProperty, vertices,normals,texCoords)
template <typename Iterator>
struct Parser : qi::grammar<Iterator, VertexProperty()> {
Parser() : Parser::base_type(start) {
v2 = qi::double_ >> qi::double_;
v3 = qi::double_ >> qi::double_ >> qi::double_;
vertexproperty = qi::lit("VertexProperty")
>> '{'
>> "vertex" >> '[' >> (v3 % ',') >> ']'
>> "normal" >> '[' >> (v3 % ',') >> ']'
>> "texCoord" >> '[' >> (v2 % ',') >> ']'
>> '}';
start = qi::skip(qi::space) [vertexproperty];
BOOST_SPIRIT_DEBUG_NODES((v2)(v3)(vertexproperty))
}
private:
qi::rule<Iterator, VertexProperty()> start;
qi::rule<Iterator, VertexProperty(), qi::space_type> vertexproperty;
qi::rule<Iterator, V2(), qi::space_type> v2;
qi::rule<Iterator, V3(), qi::space_type> v3;
};
int main() {
using Iterator = std::string::const_iterator;
std::string const sample = "VertexProperty {\n"
" vertex [ 0.0 0.0 1.0,\n"
" 1.0 1.0 1.0,\n"
" 1.0 0.0 1.0]\n"
" normal [1.0 0.0 0.0,\n"
" 0.0 1.0 0.0,\n"
" 0.0 0.0 1.0]\n"
" texCoord [0.0 0.0,\n"
" 1.0 0.0,\n"
" 1.0 1.0]\n"
"}";
auto f = sample.begin(), l = sample.end();
VertexProperty data;
bool ok = qi::parse(f, l, Parser<Iterator>(), data);
if (ok) {
std::cout << "Parsed: " << data.vertices.size() << ", " << data.normals.size() << ", " << data.texCoords.size() << "\n";
} else {
std::cout << "Parse failed\n";
}
if (f!=l)
std::cout << "Remaining input: '" << std::string(f,l) << "'\n";
}
Prints
Parsed: 3, 3, 3
With debug info
<vertexproperty>
<try>VertexProperty {\n ve</try>
<v3>
<try> 0.0 0.0 1.0,\n 1</try>
<success>,\n 1.0 1.0 1.0,\n</success>
<attributes>[[0, 0, 1]]</attributes>
</v3>
<v3>
<try>\n 1.0 1.0 1.0,\n </try>
<success>,\n 1.0 0.0 1.0]\n</success>
<attributes>[[1, 1, 1]]</attributes>
</v3>
<v3>
<try>\n 1.0 0.0 1.0]\n </try>
<success>]\n normal [1.0 0.0 0</success>
<attributes>[[1, 0, 1]]</attributes>
</v3>
<v3>
<try>1.0 0.0 0.0,\n 0.</try>
<success>,\n 0.0 1.0 0.0,\n</success>
<attributes>[[1, 0, 0]]</attributes>
</v3>
<v3>
<try>\n 0.0 1.0 0.0,\n </try>
<success>,\n 0.0 0.0 1.0]\n</success>
<attributes>[[0, 1, 0]]</attributes>
</v3>
<v3>
<try>\n 0.0 0.0 1.0]\n </try>
<success>]\n texCoord [0.0 0.0</success>
<attributes>[[0, 0, 1]]</attributes>
</v3>
<v2>
<try>0.0 0.0,\n 1.0 0.</try>
<success>,\n 1.0 0.0,\n </success>
<attributes>[[0, 0]]</attributes>
</v2>
<v2>
<try>\n 1.0 0.0,\n </try>
<success>,\n 1.0 1.0]\n}</success>
<attributes>[[1, 0]]</attributes>
</v2>
<v2>
<try>\n 1.0 1.0]\n}</try>
<success>]\n}</success>
<attributes>[[1, 1]]</attributes>
</v2>
<success></success>
<attributes>[[[[0, 0, 1], [1, 1, 1], [1, 0, 1]], [[1, 0, 0], [0, 1, 0], [0, 0, 1]], [[0, 0], [1, 0], [1, 1]]]]</attributes>
</vertexproperty>