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index.js
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index.js
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var xhr = require('corslite'),
csv2geojson = require('csv2geojson'),
wellknown = require('wellknown'),
polyline = require('polyline'),
topojson = require('topojson/topojson.js'),
toGeoJSON = require('togeojson');
module.exports.polyline = polylineLoad;
module.exports.polyline.parse = polylineParse;
module.exports.geojson = geojsonLoad;
module.exports.topojson = topojsonLoad;
module.exports.topojson.parse = topojsonParse;
module.exports.csv = csvLoad;
module.exports.csv.parse = csvParse;
module.exports.gpx = gpxLoad;
module.exports.gpx.parse = gpxParse;
module.exports.kml = kmlLoad;
module.exports.kml.parse = kmlParse;
module.exports.wkt = wktLoad;
module.exports.wkt.parse = wktParse;
function addData(l, d) {
if ('addData' in l) l.addData(d);
if ('setGeoJSON' in l) l.setGeoJSON(d);
}
/**
* Load a [GeoJSON](http://geojson.org/) document into a layer and return the layer.
*
* @param {string} url
* @param {object} options
* @param {object} customLayer
* @returns {object}
*/
function geojsonLoad(url, options, customLayer) {
var layer = customLayer || L.geoJson();
xhr(url, function(err, response) {
if (err) return layer.fire('error', { error: err });
addData(layer, JSON.parse(response.responseText));
layer.fire('ready');
});
return layer;
}
/**
* Load a [TopoJSON](https://github.com/mbostock/topojson) document into a layer and return the layer.
*
* @param {string} url
* @param {object} options
* @param {object} customLayer
* @returns {object}
*/
function topojsonLoad(url, options, customLayer) {
var layer = customLayer || L.geoJson();
xhr(url, onload);
function onload(err, response) {
if (err) return layer.fire('error', { error: err });
topojsonParse(response.responseText, options, layer);
layer.fire('ready');
}
return layer;
}
/**
* Load a CSV document into a layer and return the layer.
*
* @param {string} url
* @param {object} options
* @param {object} customLayer
* @returns {object}
*/
function csvLoad(url, options, customLayer) {
var layer = customLayer || L.geoJson();
xhr(url, onload);
function onload(err, response) {
var error;
if (err) return layer.fire('error', { error: err });
function avoidReady() {
error = true;
}
layer.on('error', avoidReady);
csvParse(response.responseText, options, layer);
layer.off('error', avoidReady);
if (!error) layer.fire('ready');
}
return layer;
}
/**
* Load a GPX document into a layer and return the layer.
*
* @param {string} url
* @param {object} options
* @param {object} customLayer
* @returns {object}
*/
function gpxLoad(url, options, customLayer) {
var layer = customLayer || L.geoJson();
xhr(url, onload);
function onload(err, response) {
var error;
if (err) return layer.fire('error', { error: err });
function avoidReady() {
error = true;
}
layer.on('error', avoidReady);
gpxParse(response.responseXML || response.responseText, options, layer);
layer.off('error', avoidReady);
if (!error) layer.fire('ready');
}
return layer;
}
/**
* Load a [KML](https://developers.google.com/kml/documentation/) document into a layer and return the layer.
*
* @param {string} url
* @param {object} options
* @param {object} customLayer
* @returns {object}
*/
function kmlLoad(url, options, customLayer) {
var layer = customLayer || L.geoJson();
xhr(url, onload);
function onload(err, response) {
var error;
if (err) return layer.fire('error', { error: err });
function avoidReady() {
error = true;
}
layer.on('error', avoidReady);
kmlParse(response.responseXML || response.responseText, options, layer);
layer.off('error', avoidReady);
if (!error) layer.fire('ready');
}
return layer;
}
/**
* Load a WKT (Well Known Text) string into a layer and return the layer
*
* @param {string} url
* @param {object} options
* @param {object} customLayer
* @returns {object}
*/
function wktLoad(url, options, customLayer) {
var layer = customLayer || L.geoJson();
xhr(url, onload);
function onload(err, response) {
if (err) return layer.fire('error', { error: err });
wktParse(response.responseText, options, layer);
layer.fire('ready');
}
return layer;
}
/**
* Load a polyline string into a layer and return the layer
*
* @param {string} url
* @param {object} options
* @param {object} customLayer
* @returns {object}
*/
function polylineLoad(url, options, customLayer) {
var layer = customLayer || L.geoJson();
xhr(url, onload);
function onload(err, response) {
if (err) return layer.fire('error', { error: err });
polylineParse(response.responseText, options, layer);
layer.fire('ready');
}
return layer;
}
function topojsonParse(data, options, layer) {
var o = typeof data === 'string' ?
JSON.parse(data) : data;
layer = layer || L.geoJson();
for (var i in o.objects) {
var ft = topojson.feature(o, o.objects[i]);
if (ft.features) addData(layer, ft.features);
else addData(layer, ft);
}
return layer;
}
function csvParse(csv, options, layer) {
layer = layer || L.geoJson();
options = options || {};
csv2geojson.csv2geojson(csv, options, onparse);
function onparse(err, geojson) {
if (err) return layer.fire('error', { error: err });
addData(layer, geojson);
}
return layer;
}
function gpxParse(gpx, options, layer) {
var xml = parseXML(gpx);
if (!xml) return layer.fire('error', {
error: 'Could not parse GPX'
});
layer = layer || L.geoJson();
var geojson = toGeoJSON.gpx(xml);
addData(layer, geojson);
return layer;
}
function kmlParse(gpx, options, layer) {
var xml = parseXML(gpx);
if (!xml) return layer.fire('error', {
error: 'Could not parse KML'
});
layer = layer || L.geoJson();
var geojson = toGeoJSON.kml(xml);
addData(layer, geojson);
return layer;
}
function polylineParse(txt, options, layer) {
layer = layer || L.geoJson();
options = options || {};
var coords = polyline.decode(txt, options.precision);
var geojson = { type: 'LineString', coordinates: [] };
for (var i = 0; i < coords.length; i++) {
// polyline returns coords in lat, lng order, so flip for geojson
geojson.coordinates[i] = [coords[i][1], coords[i][0]];
}
addData(layer, geojson);
return layer;
}
function wktParse(wkt, options, layer) {
layer = layer || L.geoJson();
var geojson = wellknown(wkt);
addData(layer, geojson);
return layer;
}
function parseXML(str) {
if (typeof str === 'string') {
return (new DOMParser()).parseFromString(str, 'text/xml');
} else {
return str;
}
}