2014-04-13 23:34:05 +00:00
|
|
|
var stream = require("stream");
|
|
|
|
|
2014-04-07 00:33:49 +00:00
|
|
|
function isInBbox(position, bbox) {
|
|
|
|
if(position.lat > bbox.top || position.lat < bbox.bottom)
|
|
|
|
return false;
|
|
|
|
if(bbox.right < bbox.left) // bbox spans over lon = 180
|
|
|
|
return (position.lon > bbox.left || position.lon < bbox.right);
|
|
|
|
else
|
|
|
|
return (position.lon > bbox.left && position.lon < bbox.right);
|
|
|
|
}
|
|
|
|
|
2014-04-13 23:34:05 +00:00
|
|
|
function filterStream(inStream, filterFunction) {
|
|
|
|
var ret = new stream.Readable({ objectMode: true });
|
|
|
|
inStream.on("data", function(data) {
|
2014-04-18 17:15:26 +00:00
|
|
|
var data = filterFunction(data);
|
|
|
|
if(data != null)
|
|
|
|
ret.push(data);
|
2014-04-13 23:34:05 +00:00
|
|
|
}).on("end", function() {
|
|
|
|
ret.push();
|
|
|
|
}).on("error", function(err) {
|
|
|
|
ret.emit("error", err);
|
|
|
|
});
|
|
|
|
|
|
|
|
ret._read = function() {
|
|
|
|
};
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2014-04-26 16:23:22 +00:00
|
|
|
function filterStreamAsync(inStream, filterFunction) {
|
|
|
|
var error = false;
|
|
|
|
|
|
|
|
var ret = new stream.Readable({ objectMode: true });
|
|
|
|
|
|
|
|
var running = false;
|
|
|
|
var queue = [ ];
|
|
|
|
|
|
|
|
function handleQueue() {
|
|
|
|
if(error || running)
|
|
|
|
return;
|
|
|
|
|
|
|
|
if(queue.length > 0) {
|
|
|
|
var next = queue.shift();
|
|
|
|
if(next == null) {
|
|
|
|
ret.push();
|
|
|
|
} else {
|
|
|
|
running = true;
|
|
|
|
filterFunction(next, function(err, newData) {
|
|
|
|
running = false;
|
|
|
|
|
|
|
|
if(error)
|
|
|
|
return;
|
|
|
|
|
|
|
|
if(err) {
|
|
|
|
error = true;
|
|
|
|
ret.emit("error", err);
|
|
|
|
} else if(newData != null) {
|
|
|
|
ret.push(newData);
|
|
|
|
}
|
|
|
|
|
|
|
|
setImmediate(handleQueue);
|
|
|
|
});
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
inStream.on("data", function(data) {
|
|
|
|
if(data != null)
|
|
|
|
queue.push(data);
|
|
|
|
handleQueue();
|
|
|
|
}).on("end", function() {
|
|
|
|
queue.push(null);
|
|
|
|
handleQueue();
|
|
|
|
}).on("error", function(err) {
|
|
|
|
ret.emit("error", err);
|
|
|
|
});
|
|
|
|
|
|
|
|
ret._read = function() {
|
|
|
|
};
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2014-04-14 02:43:40 +00:00
|
|
|
function extend(obj1, obj2) {
|
2014-05-10 16:57:08 +00:00
|
|
|
if(obj1 == null)
|
|
|
|
return null;
|
|
|
|
|
2014-04-14 02:43:40 +00:00
|
|
|
for(var i=1; i<arguments.length; i++) {
|
2014-05-10 16:57:08 +00:00
|
|
|
if(arguments[i] == null)
|
|
|
|
continue;
|
|
|
|
|
2014-04-14 02:43:40 +00:00
|
|
|
for(var j in arguments[i]) {
|
|
|
|
obj1[j] = arguments[i][j];
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return obj1;
|
|
|
|
}
|
|
|
|
|
|
|
|
function calculateDistance(posList) {
|
|
|
|
// From http://stackoverflow.com/a/365853/242365
|
|
|
|
|
|
|
|
var R = 6371; // km
|
|
|
|
var ret = 0;
|
|
|
|
|
|
|
|
for(var i=1; i<posList.length; i++) {
|
|
|
|
var lat1 = posList[i-1].lat * Math.PI / 180;
|
|
|
|
var lon1 = posList[i-1].lon * Math.PI / 180;
|
|
|
|
var lat2 = posList[i].lat * Math.PI / 180;
|
|
|
|
var lon2 = posList[i].lon * Math.PI / 180;
|
|
|
|
var dLat = lat2-lat1;
|
|
|
|
var dLon = lon2-lon1;
|
|
|
|
|
|
|
|
var a = Math.sin(dLat/2) * Math.sin(dLat/2) +
|
|
|
|
Math.sin(dLon/2) * Math.sin(dLon/2) * Math.cos(lat1) * Math.cos(lat2);
|
|
|
|
var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
|
|
|
|
ret += R * c;
|
|
|
|
}
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2014-05-10 16:51:51 +00:00
|
|
|
var LETTERS = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
|
|
|
|
|
|
|
|
function generateRandomId(length) {
|
|
|
|
var randomPadId = "";
|
|
|
|
for(var i=0; i<length; i++) {
|
|
|
|
randomPadId += LETTERS[Math.floor(Math.random() * LETTERS.length)];
|
|
|
|
}
|
|
|
|
return randomPadId;
|
|
|
|
}
|
|
|
|
|
2014-12-11 01:42:32 +00:00
|
|
|
var FAILURE = { };
|
|
|
|
|
|
|
|
function stripObject(obj, structure) {
|
|
|
|
return _stripObject(obj, structure) !== FAILURE;
|
|
|
|
}
|
|
|
|
|
|
|
|
function _stripObject(obj, type) {
|
|
|
|
if(obj === undefined)
|
|
|
|
return obj;
|
|
|
|
else if(obj === null)
|
|
|
|
return obj;
|
|
|
|
else if(type instanceof Array) {
|
|
|
|
if(!(obj instanceof Array))
|
|
|
|
return FAILURE;
|
|
|
|
|
|
|
|
for(var i=0; i<obj.length; i++) {
|
|
|
|
if((obj[i] = _stripObject(obj[i], type[0])) === FAILURE)
|
|
|
|
return FAILURE;
|
|
|
|
}
|
|
|
|
return obj;
|
|
|
|
}
|
|
|
|
else if(typeof type == "function")
|
|
|
|
return (obj instanceof type) ? obj : FAILURE;
|
|
|
|
else if(type instanceof Object) {
|
|
|
|
if(!(obj instanceof Object))
|
|
|
|
return FAILURE;
|
|
|
|
|
|
|
|
for(var i in obj) {
|
|
|
|
if(type[i] == null || obj[i] === undefined)
|
|
|
|
delete obj[i];
|
|
|
|
else if((obj[i] = _stripObject(obj[i], type[i])) === FAILURE)
|
|
|
|
return FAILURE;
|
|
|
|
}
|
|
|
|
return obj;
|
|
|
|
}
|
|
|
|
else if(type == "number" && typeof obj == "string")
|
|
|
|
return isNaN(obj = 1*obj) ? FAILURE : obj;
|
|
|
|
else if(type == "string" && typeof obj == "number")
|
|
|
|
return ""+obj;
|
|
|
|
else if(typeof type == "string")
|
|
|
|
return (typeof obj == type) ? obj : FAILURE;
|
|
|
|
else
|
|
|
|
return FAILURE;
|
|
|
|
}
|
|
|
|
|
2014-04-07 00:33:49 +00:00
|
|
|
module.exports = {
|
2014-04-13 23:34:05 +00:00
|
|
|
isInBbox : isInBbox,
|
2014-04-14 02:43:40 +00:00
|
|
|
filterStream : filterStream,
|
2014-04-26 16:23:22 +00:00
|
|
|
filterStreamAsync : filterStreamAsync,
|
2014-04-14 02:43:40 +00:00
|
|
|
extend : extend,
|
2014-04-28 16:35:27 +00:00
|
|
|
calculateDistance : calculateDistance,
|
2014-12-11 01:42:32 +00:00
|
|
|
generateRandomId : generateRandomId,
|
|
|
|
stripObject : stripObject
|
2014-04-07 00:33:49 +00:00
|
|
|
};
|