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node-red-nodes/parsers/geohash/70-geohash.js
2014-12-10 09:30:20 +00:00

94 lines
4.0 KiB
JavaScript

/**
* Copyright 2014 IBM Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
**/
module.exports = function(RED) {
"use strict";
var geohash = require('ngeohash');
function GeohashNode(n) {
RED.nodes.createNode(this,n);
var node = this;
var round = function(value, decimals) {
return Number(Math.round(value+'e'+decimals)+'e-'+decimals);
}
this.on("input", function(msg) {
if (msg.hasOwnProperty("location")) {
if (msg.location.hasOwnProperty("geohash")) {
var pos = geohash.decode(msg.location.geohash);
msg.location.lat = round(pos.latitude,5);
msg.location.lon = round(pos.longitude,5);
msg.location.error = { lat:round(pos.error.latitude,5), lon:round(pos.error.longitude,5) };
node.send(msg);
}
else {
var lat = msg.location.lat;
var lon = msg.location.lon;
var len = parseInt(msg.location.precision || msg.location.payload || 9);
if (len < 1) { len = 1; }
if (len > 9) { len = 9; }
if (lat && lon) {
msg.location.geohash = geohash.encode(lat, lon, len);
node.send(msg);
}
}
}
else if (typeof msg.payload === "string") {
// try to decode it...
var regexp = new RegExp('^[a-z0-9]{1,9}$'); // can only contain a-z or 0-9 and length 1-9
if (regexp.test(msg.payload)) {
var pos = geohash.decode(msg.payload);
msg.payload = { lat:round(pos.latitude,5), lon:round(pos.longitude,5) };
msg.payload.error = { lat:round(pos.error.latitude,5), lon:round(pos.error.longitude,5) };
node.send(msg);
}
else if (msg.payload.indexOf(",") !== -1) {
// has a comma so assume it's lat,lon(,precision)
var bits = msg.payload.split(",");
if (bits.length === 2) {
var la = Number(bits[0]);
if (la < -90) { la = -90; }
if (la > 90) { la = 90; }
var lo = Number(bits[1]);
if (lo < -180) { lo = -180; }
if (lo > 180) { la = 180; }
msg.payload = geohash.encode(la, lo);
node.send(msg);
}
else { node.warn("Unexpected string format - should be lat,lon"); }
}
else { node.warn("Unexpected string format - should either be lat,lon or geohash"); }
}
else if (typeof msg.payload === "object") {
var lat = msg.payload.lat || msg.payload.latitude;
var lon = msg.payload.lon || msg.payload.longitude;
var len = parseInt(msg.payload.precision || 9);
if (len < 1) { len = 1; }
if (len > 9) { len = 9; }
if (lat && lon) {
msg.payload.geohash = geohash.encode(lat, lon, len);
node.send(msg);
}
}
else {
node.warn("This node only expects strings or objects.");
}
});
}
RED.nodes.registerType("geohash",GeohashNode);
}