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index.js
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index.js
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'use strict';
var dsv = require('d3-dsv'),
sexagesimal = require('@mapbox/sexagesimal');
var latRegex = /(Lat)(itude)?/gi,
lonRegex = /(L)(on|ng)(gitude)?/i;
function guessHeader(row, regexp) {
var name, match, score;
for (var f in row) {
match = f.match(regexp);
if (match && (!name || match[0].length / f.length > score)) {
score = match[0].length / f.length;
name = f;
}
}
return name;
}
function guessLatHeader(row) { return guessHeader(row, latRegex); }
function guessLonHeader(row) { return guessHeader(row, lonRegex); }
function isLat(f) { return !!f.match(latRegex); }
function isLon(f) { return !!f.match(lonRegex); }
function keyCount(o) {
return (typeof o == 'object') ? Object.keys(o).length : 0;
}
function autoDelimiter(x) {
var delimiters = [',', ';', '\t', '|'];
var results = [];
delimiters.forEach(function (delimiter) {
var res = dsv.dsvFormat(delimiter).parse(x);
if (res.length >= 1) {
var count = keyCount(res[0]);
for (var i = 0; i < res.length; i++) {
if (keyCount(res[i]) !== count) return;
}
results.push({
delimiter: delimiter,
arity: Object.keys(res[0]).length,
});
}
});
if (results.length) {
return results.sort(function (a, b) {
return b.arity - a.arity;
})[0].delimiter;
} else {
return null;
}
}
/**
* Silly stopgap for dsv to d3-dsv upgrade
*
* @param {Array} x dsv output
* @returns {Array} array without columns member
*/
function deleteColumns(x) {
delete x.columns;
return x;
}
function auto(x) {
var delimiter = autoDelimiter(x);
if (!delimiter) return null;
return deleteColumns(dsv.dsvFormat(delimiter).parse(x));
}
function csv2geojson(x, options, callback) {
if (!callback) {
callback = options;
options = {};
}
options.delimiter = options.delimiter || ',';
var latfield = options.latfield || '',
lonfield = options.lonfield || '',
crs = options.crs || '';
var features = [],
featurecollection = {type: 'FeatureCollection', features: features};
if (crs !== '') {
featurecollection.crs = {type: 'name', properties: {name: crs}};
}
if (options.delimiter === 'auto' && typeof x == 'string') {
options.delimiter = autoDelimiter(x);
if (!options.delimiter) {
callback({
type: 'Error',
message: 'Could not autodetect delimiter'
});
return;
}
}
var numericFields = options.numericFields ? options.numericFields.split(',') : null;
var parsed = (typeof x == 'string') ?
dsv.dsvFormat(options.delimiter).parse(x, function (d) {
if (numericFields) {
for (var key in d) {
if (numericFields.includes(key)) {
d[key] = +d[key];
}
}
}
return d;
}) : x;
if (!parsed.length) {
callback(null, featurecollection);
return;
}
var errors = [];
var i;
if (!latfield) latfield = guessLatHeader(parsed[0]);
if (!lonfield) lonfield = guessLonHeader(parsed[0]);
var noGeometry = (!latfield || !lonfield);
if (noGeometry) {
for (i = 0; i < parsed.length; i++) {
features.push({
type: 'Feature',
properties: parsed[i],
geometry: null
});
}
callback(errors.length ? errors : null, featurecollection);
return;
}
for (i = 0; i < parsed.length; i++) {
if (parsed[i][lonfield] !== undefined &&
parsed[i][latfield] !== undefined) {
var lonk = parsed[i][lonfield],
latk = parsed[i][latfield],
lonf, latf,
a;
a = sexagesimal(lonk, 'EW');
if (a) lonk = a;
a = sexagesimal(latk, 'NS');
if (a) latk = a;
lonf = parseFloat(lonk);
latf = parseFloat(latk);
if (isNaN(lonf) ||
isNaN(latf)) {
errors.push({
message: 'A row contained an invalid value for latitude or longitude',
row: parsed[i],
index: i
});
} else {
if (!options.includeLatLon) {
delete parsed[i][lonfield];
delete parsed[i][latfield];
}
features.push({
type: 'Feature',
properties: parsed[i],
geometry: {
type: 'Point',
coordinates: [
parseFloat(lonf),
parseFloat(latf)
]
}
});
}
}
}
callback(errors.length ? errors : null, featurecollection);
}
function toLine(gj) {
var features = gj.features;
var line = {
type: 'Feature',
geometry: {
type: 'LineString',
coordinates: []
}
};
for (var i = 0; i < features.length; i++) {
line.geometry.coordinates.push(features[i].geometry.coordinates);
}
line.properties = features.reduce(function (aggregatedProperties, newFeature) {
for (var key in newFeature.properties) {
if (!aggregatedProperties[key]) {
aggregatedProperties[key] = [];
}
aggregatedProperties[key].push(newFeature.properties[key]);
}
return aggregatedProperties;
}, {});
return {
type: 'FeatureCollection',
features: [line]
};
}
function toPolygon(gj) {
var features = gj.features;
var poly = {
type: 'Feature',
geometry: {
type: 'Polygon',
coordinates: [[]]
}
};
for (var i = 0; i < features.length; i++) {
poly.geometry.coordinates[0].push(features[i].geometry.coordinates);
}
poly.properties = features.reduce(function (aggregatedProperties, newFeature) {
for (var key in newFeature.properties) {
if (!aggregatedProperties[key]) {
aggregatedProperties[key] = [];
}
aggregatedProperties[key].push(newFeature.properties[key]);
}
return aggregatedProperties;
}, {});
return {
type: 'FeatureCollection',
features: [poly]
};
}
module.exports = {
isLon: isLon,
isLat: isLat,
guessLatHeader: guessLatHeader,
guessLonHeader: guessLonHeader,
csv: dsv.csvParse,
tsv: dsv.tsvParse,
dsv: dsv,
auto: auto,
csv2geojson: csv2geojson,
toLine: toLine,
toPolygon: toPolygon
};