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@ -5,70 +5,113 @@ var GeoJSON = require('geojson'),
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// Properties to be copied when details=true
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var DETAILS_PROPS = [ |
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'alpha3', |
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'admin0', |
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'admin1', |
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'admin1_abbr', |
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'admin2', |
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'local_admin', |
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'locality', |
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'neighborhood', |
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'housenumber', |
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'street', |
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'category', |
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'address', |
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'postalcode', |
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'country_a', |
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'country', |
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'region', |
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'region_a', |
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'county', |
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'localadmin', |
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'locality', |
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'neighbourhood' |
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]; |
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function search( docs, params ){ |
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var META_MAP = { |
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'geoname': { type: '???', source: 'gn' }, // TODO: not sure how to map. will need to use categories?
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'osmnode': { type: 'venue', source: 'osm' }, |
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'osmway': { type: 'venue', source: 'osm' }, |
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'admin0': { type: 'country', source: 'qs' }, |
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'admin1': { type: 'region', source: 'qs' }, |
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'admin2': { type: 'county', source: 'qs' }, |
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'neighborhood': { type: 'neighbourhood', source: 'qs' }, |
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'locality': { type: 'locality', source: 'qs' }, |
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'local_admin': { type: 'local_admin', source: 'qs' }, |
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'osmaddress': { type: 'address', source: 'osm' }, |
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'openaddresses': { type: 'address', source: 'oa' } |
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}; |
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function geojsonifyPlaces( docs, params ){ |
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var details = params ? params.details : {}; |
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details = details === true || details === 1; |
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// flatten & expand data for geojson conversion
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var geodata = docs.map( function( doc ) { |
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var geodata = docs |
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.map(geojsonifyPlace.bind(null, details)) |
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.filter( function( doc ){ |
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return !!doc; |
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}); |
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// something went very wrong
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if( !doc || !doc.hasOwnProperty( 'center_point' ) ) { |
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return warning(); |
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} |
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// convert to geojson
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var geojson = GeoJSON.parse( geodata, { Point: ['lat', 'lng'] }); |
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var output = {}; |
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// bounding box calculations
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computeBBox(geojson); |
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// provide metadata to consumer
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output.id = doc._id; |
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output.layer = doc._type; |
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return geojson; |
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} |
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// map center_point
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output.lat = parseFloat( doc.center_point.lat ); |
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output.lng = parseFloat( doc.center_point.lon ); |
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function geojsonifyPlace(details, place) { |
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if (details) { |
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// map name
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if( !doc.name || !doc.name.default ) { return warning(); } |
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output.name = doc.name.default; |
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// something went very wrong
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if( !place || !place.hasOwnProperty( 'center_point' ) ) { |
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return warning('No doc or center_point property'); |
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} |
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copyProperties( doc, DETAILS_PROPS, output ); |
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} |
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var geocoding = {}; |
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// generate region-specific text string
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output.text = outputGenerator( doc ); |
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addMetaData(place, geocoding); |
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addDetails(details, place, geocoding); |
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addLabel(place, geocoding); |
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return output; |
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var output = {}; |
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// filter-out invalid entries
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}).filter( function( doc ){ |
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return doc; |
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}); |
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output.geocoding = geocoding; |
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// map center_point for GeoJSON to work properly
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// these should not show up in the final feature properties
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output.lat = parseFloat(place.center_point.lat); |
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output.lng = parseFloat(place.center_point.lon); |
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// convert to geojson
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var geojson = GeoJSON.parse( geodata, { Point: ['lat', 'lng'] }); |
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return output; |
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} |
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// bounding box calculations
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/** |
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* Add details properties when needed |
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* |
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* @param {boolean} details |
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* @param {object} src |
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* @param {object} dst |
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*/ |
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function addDetails(details, src, dst) { |
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if (details) { |
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// map name
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if( !src.name || !src.name.default ) { return warning(src); } |
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dst.name = src.name.default; |
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copyProperties(src, DETAILS_PROPS, dst); |
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} |
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} |
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/** |
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* Add region-specific label string |
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* |
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* @param {object} src |
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* @param {object} dst |
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*/ |
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function addLabel(src, dst) { |
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dst.label = outputGenerator(src); |
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} |
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/** |
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* Compute bbox that encompasses all features in the result set. |
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* Set bbox property on the geojson object. |
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* |
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* @param {object} geojson |
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*/ |
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function computeBBox(geojson) { |
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// @note: extent() sometimes throws Errors for unusual data
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// eg: https://github.com/pelias/pelias/issues/84
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try { |
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@ -80,8 +123,6 @@ function search( docs, params ){
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console.error( 'bbox error', e.message, e.stack ); |
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console.error( 'geojson', JSON.stringify( geojson, null, 2 ) ); |
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} |
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return geojson; |
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} |
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/** |
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@ -90,16 +131,30 @@ function search( docs, params ){
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* |
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* @param {object} source |
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* @param {[]} props |
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* @param {object} dest |
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* @param {object} dst |
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*/ |
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function copyProperties( source, props, dest ) { |
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function copyProperties( source, props, dst ) { |
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props.forEach( function ( prop ) { |
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if ( source.hasOwnProperty( prop ) ) { |
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dest[prop] = source[prop]; |
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dst[prop] = source[prop]; |
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} |
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}); |
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} |
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/** |
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* Determine and set place id, type, and source |
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* |
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* @param {object} src |
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* @param {object} dst |
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*/ |
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function addMetaData(src, dst) { |
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// lookup mapping, or set both values to _type if not found
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var meta = META_MAP[src._type] || { type: src._type, source: src._type }; |
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dst.id = src._id; |
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dst.type = meta.type; |
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dst.source = meta.source; |
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} |
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/** |
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* emit a warning if the doc format is invalid |
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@ -107,9 +162,9 @@ function copyProperties( source, props, dest ) {
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* @note: if you see this error, fix it ASAP! |
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*/ |
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function warning( doc ) { |
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console.error( 'error: invalid doc', __filename, doc ); |
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console.error( 'error: invalid doc', __filename, doc); |
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return false; // remove offending doc from results
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} |
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module.exports.search = search; |
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module.exports.search = geojsonifyPlaces; |
Diana Shkolnikov
9 years ago