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first attempt to re-use generic JSON rules in geojson/topojson parsers

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This commit is contained in:
artemp 2013-10-28 15:54:47 +00:00
parent 2eaf6a1ead
commit c7a989ae83
2 changed files with 31 additions and 25 deletions
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22
include/mapnik/json/feature_grammar.hpp
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@ -126,15 +126,9 @@ struct extract_geometry
};
#endif
template <typename Iterator, typename FeatureType>
struct feature_grammar :
qi::grammar<Iterator, void(FeatureType&),
space_type>
template <typename Iterator>
struct generic_json
{
feature_grammar(mapnik::transcoder const& tr);
// start
// generic JSON
qi::rule<Iterator,space_type> value;
qi::symbols<char const, char const> unesc_char;
qi::uint_parser< unsigned, 16, 4, 4 > hex4 ;
@ -147,6 +141,18 @@ struct feature_grammar :
qi::rule<Iterator,space_type> array;
qi::rule<Iterator,space_type> pairs;
qi::real_parser<double, qi::strict_real_policies<double> > strict_double;
};
template <typename Iterator, typename FeatureType>
struct feature_grammar :
qi::grammar<Iterator, void(FeatureType&),
space_type>
{
feature_grammar(mapnik::transcoder const& tr);
// start
// generic JSON
generic_json<Iterator> json;
// geoJSON
qi::rule<Iterator,void(FeatureType&),space_type> feature; // START

34
src/json/feature_grammar.cpp
View file

@ -66,37 +66,37 @@ feature_grammar<Iterator,FeatureType>::feature_grammar(mapnik::transcoder const&
using phoenix::construct;
// generic json types
value = object | array | string_
| number
json.value = json.object | json.array | json.string_
| json.number
;
pairs = key_value % lit(',')
json.pairs = json.key_value % lit(',')
;
key_value = (string_ >> lit(':') >> value)
json.key_value = (json.string_ >> lit(':') >> json.value)
;
object = lit('{')
>> *pairs
json.object = lit('{')
>> *json.pairs
>> lit('}')
;
array = lit('[')
>> value >> *(lit(',') >> value)
json.array = lit('[')
>> json.value >> *(lit(',') >> json.value)
>> lit(']')
;
// https://github.com/mapnik/mapnik/issues/1342
#if BOOST_VERSION >= 104700
number %= strict_double
json.number %= json.strict_double
#else
number = strict_double
json.number = json.strict_double
#endif
| int__
| json.int__
| lit("true") [_val = true]
| lit ("false") [_val = false]
| lit("null")[_val = construct<value_null>()]
;
unesc_char.add
json.unesc_char.add
("\\\"", '\"') // quotation mark
("\\\\", '\\') // reverse solidus
("\\/", '/') // solidus
@ -107,10 +107,10 @@ feature_grammar<Iterator,FeatureType>::feature_grammar(mapnik::transcoder const&
("\\t", '\t') // tab
;
#if BOOST_VERSION > 104200
string_ %= lit('"') >> no_skip[*(unesc_char | "\\u" >> hex4 | (char_ - lit('"')))] >> lit('"')
json.string_ %= lit('"') >> no_skip[*(json.unesc_char | "\\u" >> json.hex4 | (char_ - lit('"')))] >> lit('"')
;
#else
string_ %= lit('"') >> lexeme[*(unesc_char | "\\u" >> hex4 | (char_ - lit('"')))] >> lit('"')
json.string_ %= lit('"') >> lexeme[*(json.unesc_char | "\\u" >> json.hex4 | (char_ - lit('"')))] >> lit('"')
;
#endif
// geojson types
@ -121,7 +121,7 @@ feature_grammar<Iterator,FeatureType>::feature_grammar(mapnik::transcoder const&
;
feature = lit('{')
>> (feature_type | (lit("\"geometry\"") > lit(':') > geometry_grammar_(extract_geometry_(_r1))) | properties(_r1) | key_value) % lit(',')
>> (feature_type | (lit("\"geometry\"") > lit(':') > geometry_grammar_(extract_geometry_(_r1))) | properties(_r1) | json.key_value) % lit(',')
>> lit('}')
;
@ -129,10 +129,10 @@ feature_grammar<Iterator,FeatureType>::feature_grammar(mapnik::transcoder const&
>> lit(':') >> (lit('{') >> attributes(_r1) >> lit('}')) | lit("null")
;
attributes = (string_ [_a = _1] >> lit(':') >> attribute_value [put_property_(_r1,_a,_1)]) % lit(',')
attributes = (json.string_ [_a = _1] >> lit(':') >> attribute_value [put_property_(_r1,_a,_1)]) % lit(',')
;
attribute_value %= number | string_ ;
attribute_value %= json.number | json.string_ ;
feature.name("Feature");
properties.name("Properties");