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geojson generator : catch empty geometries early

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```json
{"type":"Feature","id":1,"geometry":null,"properties":{}}
```
This commit is contained in:
artemp 2013-11-21 10:01:20 +00:00
parent 4aa3023a9d
commit 2b8b71fc98
1 changed files with 26 additions and 15 deletions
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41
include/mapnik/json/geometry_generator_grammar.hpp
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@ -112,6 +112,20 @@ struct multi_geometry_type
return std::tuple<unsigned,bool>(type, collection);
}
};
struct not_empty
{
typedef bool result_type;
result_type operator() (geometry_container const& cont) const
{
for (auto const& geom : cont)
{
if (geom.size() > 0) return true;
}
return false;
}
};
#else
struct get_type
{
@ -214,10 +228,7 @@ struct geometry_generator_grammar :
using boost::spirit::karma::_r1;
using boost::spirit::karma::eps;
coordinates = empty | point | linestring | polygon
;
empty = &uint_(0)[_1 = _size(_val)] << lit("null")
coordinates = point | linestring | polygon
;
point = &uint_(mapnik::geometry_type::types::Point)[_1 = _type(_val)]
@ -259,7 +270,6 @@ struct geometry_generator_grammar :
}
// rules
karma::rule<OutputIterator, geometry_type const& ()> coordinates;
karma::rule<OutputIterator, geometry_type const& ()> empty;
karma::rule<OutputIterator, geometry_type const& ()> point;
karma::rule<OutputIterator, geometry_type const& ()> linestring;
karma::rule<OutputIterator, geometry_type const& ()> polygon;
@ -271,7 +281,6 @@ struct geometry_generator_grammar :
// phoenix functions
phoenix::function<get_type > _type;
phoenix::function<get_first> _first;
phoenix::function<get_size> _size;
//
karma::real_generator<double, json_coordinate_policy<double> > coord_type;
@ -293,6 +302,7 @@ struct multi_geometry_generator_grammar :
using boost::spirit::karma::_1;
using boost::spirit::karma::_a;
using boost::spirit::karma::_r1;
using boost::spirit::bool_;
geometry_types.add
(mapnik::geometry_type::types::Point,"\"Point\"")
@ -303,7 +313,7 @@ struct multi_geometry_generator_grammar :
(mapnik::geometry_type::types::Polygon + 3,"\"MultiPolygon\"")
;
start %= ( eps(phoenix::at_c<1>(_a))[_a = _multi_type(_val)]
start %= ( eps(phoenix::at_c<1>(_a))[_a = multi_type_(_val)]
<< lit("{\"type\":\"GeometryCollection\",\"geometries\":[")
<< geometry_collection << lit("]}")
|
@ -313,13 +323,13 @@ struct multi_geometry_generator_grammar :
geometry_collection = -(geometry2 % lit(','))
;
geometry = (lit("{\"type\":")
<< geometry_types[_1 = phoenix::at_c<0>(_a)][_a = _multi_type(_val)]
<< lit(",\"coordinates\":")
<< karma::string[ phoenix::if_ (phoenix::at_c<0>(_a) > 3) [_1 = '['].else_[_1 = ""]]
<< coordinates
<< karma::string[ phoenix::if_ (phoenix::at_c<0>(_a) > 3) [_1 = ']'].else_[_1 = ""]]
<< lit('}')) | lit("null")
geometry = ( &bool_(true)[_1 = not_empty_(_val)] << lit("{\"type\":")
<< geometry_types[_1 = phoenix::at_c<0>(_a)][_a = multi_type_(_val)]
<< lit(",\"coordinates\":")
<< karma::string[ phoenix::if_ (phoenix::at_c<0>(_a) > 3) [_1 = '['].else_[_1 = ""]]
<< coordinates
<< karma::string[ phoenix::if_ (phoenix::at_c<0>(_a) > 3) [_1 = ']'].else_[_1 = ""]]
<< lit('}')) | lit("null")
;
geometry2 = lit("{\"type\":")
@ -345,8 +355,9 @@ struct multi_geometry_generator_grammar :
karma::rule<OutputIterator, geometry_container const&()> coordinates;
geometry_generator_grammar<OutputIterator> path;
// phoenix
phoenix::function<multi_geometry_type> _multi_type;
phoenix::function<multi_geometry_type> multi_type_;
phoenix::function<get_type > type_;
phoenix::function<not_empty> not_empty_;
// symbols table
karma::symbols<unsigned, char const*> geometry_types;
};