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Pretty format GeoJSON Features
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package main | |
import ( | |
"github.com/tidwall/gjson" | |
"github.com/tidwall/pretty" | |
) | |
var json = []byte(` | |
{ | |
"type": "Feature", | |
"geometry": { | |
"type": "Polygon", | |
"coordinates": [[[-67.13734351262877, 45.137451890638886], | |
[-66.96466, 44.8097], | |
[-68.03252, 44.3252], | |
[-69.06, 43.98], | |
[-70.11617, 43.68405], | |
[-70.64573401557249, 43.090083319667144], | |
[-70.75102474636725, 43.08003225358635], | |
[-70.79761105007827, 43.21973948828747], | |
[-70.98176001655037, 43.36789581966826], | |
[-70.94416541205806, 43.46633942318431], | |
[-71.08482, 45.3052400000002], | |
[-70.6600225491012, 45.46022288673396], | |
[-70.30495378282376, 45.914794623389355], | |
[-70.00014034695016, 46.69317088478567], | |
[-69.23708614772835, 47.44777598732787], | |
[-68.90478084987546, 47.184794623394396], | |
[-68.23430497910454, 47.35462921812177], | |
[-67.79035274928509, 47.066248887716995], | |
[-67.79141211614706, 45.702585354182816], | |
[-67.13734351262877, 45.137451890638886]]] | |
}, | |
"properties":{"key2": "hello","key1":"world"} | |
} | |
`) | |
func prettyGeoJSON(json []byte) []byte { | |
// get the geometry. | |
res := gjson.GetBytes(json, "geometry") | |
// sanity checks | |
if res.Index == 0 || len(res.Raw) == 0 || | |
res.Raw[0] != '{' || res.Raw[len(res.Raw)-1] != '}' { | |
// probably a generic geometry, make it ugly | |
return pretty.Ugly(json) | |
} | |
// make an ugly copy of just the geometry segment | |
geom := pretty.Ugly(json[res.Index : res.Index+len(res.Raw)]) | |
// now for the tricky part. | |
// empty the geometry object. | |
// Note that this mutates the original json. | |
for i := 1; i < len(res.Raw)-1; i++ { | |
json[res.Index+i] = ' ' | |
} | |
// make the json pretty | |
json = pretty.Pretty(json) | |
// find the new location of the geometry | |
res = gjson.GetBytes(json, "geometry") | |
// allocate the space for the final json. | |
final := make([]byte, len(json)+len(geom)-2) | |
copy(final, json[:res.Index]) | |
copy(final[res.Index:], geom) | |
copy(final[res.Index+len(geom):], json[res.Index+len(res.Raw):]) | |
return final | |
} | |
func main() { | |
json = prettyGeoJSON(json) | |
println(string(json)) | |
} |
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