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July 5, 2019 02:50
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GeoJSON serialiser that doesn't explode your nested coordinate arrays
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| const replacerWrapper = val => val.replace(/\"\[/g, '[').replace(/\]\"/g,']') | |
| const replacer = (name, val) => { | |
| console.log({name, val}) | |
| if (name === 'coordinates' && Array.isArray(val)) { | |
| val = JSON.stringify(val) | |
| } | |
| return val | |
| } | |
| module.exports = { | |
| replacer, replacerWrapper, | |
| geojsonSerialiser: (geojson, space) => replacerWrapper(JSON.stringify(geojson, replacer, space)) | |
| } | |
| // Usage: | |
| // import { geojsonSerialiser } from 'geojson-stringify' | |
| // geojsonSerialiser(geojsonObject, 2) | |
| // Output is the same as JSON.stringify(geojson, null, 2), but with `geometry.coordinates` arrays on a single line, e.g. | |
| // { | |
| // "@context": { | |
| // "geojson": "https://purl.org/geojson/vocab#", | |
| // "Feature": "geojson:Feature", | |
| // "FeatureCollection": "geojson:FeatureCollection", | |
| // "GeometryCollection": "geojson:GeometryCollection", | |
| // "LineString": "geojson:LineString", | |
| // "MultiLineString": "geojson:MultiLineString", | |
| // "MultiPoint": "geojson:MultiPoint", | |
| // "MultiPolygon": "geojson:MultiPolygon", | |
| // "Point": "geojson:Point", | |
| // "Polygon": "geojson:Polygon", | |
| // "bbox": { | |
| // "@container": "@list", | |
| // "@id": "geojson:bbox" | |
| // }, | |
| // "coordinates": { | |
| // "@container": "@list", | |
| // "@id": "geojson:coordinates" | |
| // }, | |
| // "features": { | |
| // "@container": "@set", | |
| // "@id": "geojson:features" | |
| // }, | |
| // "geometry": "geojson:geometry", | |
| // "id": "@id", | |
| // "properties": "geojson:properties", | |
| // "type": "@type", | |
| // "description": "http://purl.org/dc/terms/description", | |
| // "title": "http://purl.org/dc/terms/title" | |
| // }, | |
| // "type": "Feature", | |
| // "id": "sample-multipolygon", | |
| // "geometry": { | |
| // "type": "MultiPolygon", | |
| // "coordinates": [[[[180,40],[180,50],[170,50],[170,40],[180,40]]],[[[-170,40],[-170,50],[-180,50],[-180,40],[-170,40]]]] | |
| // }, | |
| // "properties": { | |
| // "title": "Sample MultiPolygon", | |
| // "description": "Antimerdian-straddling MultiPolygon from RFC7946" | |
| // } | |
| // } | |
| // Note the value of geometry.coordinates does not have line breaks! Sanity prevails. |
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