geofire.min.js

/*!
 * GeoFire is an open-source library that allows you to store and query a set
 * of keys based on their geographic location. At its heart, GeoFire simply
 * stores locations with string keys. Its main benefit, however, is the
 * possibility of retrieving only those keys within a given geographic area -
 * all in realtime.
 *
 * GeoFire 4.1.2
 * https://github.com/firebase/geofire-js/
 * License: MIT
 */
var GeoFire=function(){"use strict";function e(e,n){return v(e),g(n),{".priority":n,g:n,l:e}}function n(e){if(null!==e&&e.hasOwnProperty("l")&&Array.isArray(e.l)&&2===e.l.length)return e.l;throw new Error("Unexpected GeoFire location object encountered: "+JSON.stringify(e))}function t(e){var n;return n="function"==typeof e.key?e.key():"string"==typeof e.key||null===e.key?e.key:e.name()}var r=function(e){if(this.cancel=function(){"undefined"!=typeof n&&(n(),n=void 0)},"function"!=typeof e)throw new Error("callback must be a function");var n=e},i=function(t){if(this.ref=function(){return r},this.set=function(n,t){var i;if("string"==typeof n&&0!==n.length)i={},i[n]=t;else{if("object"!=typeof n)throw new Error("keyOrLocations must be a string or a mapping of key - location pairs.");if("undefined"!=typeof t)throw new Error("The location argument should not be used if you pass an object to set().");i=n}var o={};return Object.keys(i).forEach(function(n){y(n);var t=i[n];if(null===t)o[n]=null;else{v(t);var r=p(t);o[n]=e(t,r)}}),r.update(o)},this.get=function(e){return y(e),r.child(e).once("value").then(function(e){var t=e.val();return null===t?null:n(t)})},this.remove=function(e){return this.set(e,null)},this.query=function(e){return new C(r,e)},"[object Object]"!==Object.prototype.toString.call(t))throw new Error("firebaseRef must be an instance of Firebase");var r=t};i.distance=function(e,n){v(e),v(n);var t=6371,r=b(n[0]-e[0]),i=b(n[1]-e[1]),o=Math.sin(r/2)*Math.sin(r/2)+Math.cos(b(e[0]))*Math.cos(b(n[0]))*Math.sin(i/2)*Math.sin(i/2),a=2*Math.atan2(Math.sqrt(o),Math.sqrt(1-o));return t*a};var o=10,a="0123456789bcdefghjkmnpqrstuvwxyz",u=40007860,f=110574,c=5,l=22*c,s=6378137,h=.00669447819799,d=1e-12;Math.log2=Math.log2||function(e){return Math.log(e)/Math.log(2)};var y=function(e){var n;if("string"!=typeof e?n="key must be a string":0===e.length?n="key cannot be the empty string":1+o+e.length>755?n="key is too long to be stored in Firebase":/[\[\].#$\/\u0000-\u001F\u007F]/.test(e)&&(n="key cannot contain any of the following characters: . # $ ] [ /"),"undefined"!=typeof n)throw new Error("Invalid GeoFire key '"+e+"': "+n)},v=function(e){var n;if(Array.isArray(e))if(2!==e.length)n="expected array of length 2, got length "+e.length;else{var t=e[0],r=e[1];"number"!=typeof t||isNaN(t)?n="latitude must be a number":-90>t||t>90?n="latitude must be within the range [-90, 90]":"number"!=typeof r||isNaN(r)?n="longitude must be a number":(-180>r||r>180)&&(n="longitude must be within the range [-180, 180]")}else n="location must be an array";if("undefined"!=typeof n)throw new Error("Invalid GeoFire location '"+e+"': "+n)},g=function(e){var n;if("string"!=typeof e)n="geohash must be a string";else if(0===e.length)n="geohash cannot be the empty string";else for(var t=0,r=e.length;r>t;++t)-1===a.indexOf(e[t])&&(n='geohash cannot contain "'+e[t]+'"');if("undefined"!=typeof n)throw new Error("Invalid GeoFire geohash '"+e+"': "+n)},m=function(e,n){if("object"!=typeof e)throw new Error("query criteria must be an object");if("undefined"==typeof e.center&&"undefined"==typeof e.radius)throw new Error("radius and/or center must be specified");if(n&&("undefined"==typeof e.center||"undefined"==typeof e.radius))throw new Error("query criteria for a new query must contain both a center and a radius");for(var t=Object.keys(e),r=t.length,i=0;r>i;++i){var o=t[i];if("center"!==o&&"radius"!==o)throw new Error("Unexpected attribute '"+o+"'' found in query criteria")}if("undefined"!=typeof e.center&&v(e.center),"undefined"!=typeof e.radius){if("number"!=typeof e.radius||isNaN(e.radius))throw new Error("radius must be a number");if(e.radius<0)throw new Error("radius must be greater than or equal to 0")}},b=function(e){if("number"!=typeof e||isNaN(e))throw new Error("Error: degrees must be a number");return e*Math.PI/180},p=function(e,n){if(v(e),"undefined"!=typeof n){if("number"!=typeof n||isNaN(n))throw new Error("precision must be a number");if(0>=n)throw new Error("precision must be greater than 0");if(n>22)throw new Error("precision cannot be greater than 22");if(Math.round(n)!==n)throw new Error("precision must be an integer")}n=n||o;for(var t={min:-90,max:90},r={min:-180,max:180},i="",u=0,f=0,c=1;i.length<n;){var l=c?e[1]:e[0],s=c?r:t,h=(s.min+s.max)/2;l>h?(u=(u<<1)+1,s.min=h):(u=(u<<1)+0,s.max=h),c=!c,4>f?f++:(f=0,i+=a[u],u=0)}return i},w=function(e,n){var t=b(n),r=Math.cos(t)*s*Math.PI/180,i=1/Math.sqrt(1-h*Math.sin(t)*Math.sin(t)),o=r*i;return d>o?e>0?360:0:Math.min(360,e/o)},k=function(e,n){var t=w(e,n);return Math.abs(t)>1e-6?Math.max(1,Math.log2(360/t)):1},M=function(e){return Math.min(Math.log2(u/2/e),l)},E=function(e){if(180>=e&&e>=-180)return e;var n=e+180;return n>0?n%360-180:180- -n%360},x=function(e,n){var t=n/f,r=Math.min(90,e[0]+t),i=Math.max(-90,e[0]-t),o=2*Math.floor(M(n)),a=2*Math.floor(k(n,r))-1,u=2*Math.floor(k(n,i))-1;return Math.min(o,a,u,l)},O=function(e,n){var t=n/f,r=Math.min(90,e[0]+t),i=Math.max(-90,e[0]-t),o=w(n,r),a=w(n,i),u=Math.max(o,a);return[[e[0],e[1]],[e[0],E(e[1]-u)],[e[0],E(e[1]+u)],[r,e[1]],[r,E(e[1]-u)],[r,E(e[1]+u)],[i,e[1]],[i,E(e[1]-u)],[i,E(e[1]+u)]]},_=function(e,n){g(e);var t=Math.ceil(n/c);if(e.length<t)return[e,e+"~"];e=e.substring(0,t);var r=e.substring(0,e.length-1),i=a.indexOf(e.charAt(e.length-1)),o=n-r.length*c,u=c-o,f=i>>u<<u,l=f+(1<<u);return l>31?[r+a[f],r+"~"]:[r+a[f],r+a[l]]},j=function(e,n){v(e);var t=Math.max(1,x(e,n)),r=Math.ceil(t/c),i=O(e,n),o=i.map(function(e){return _(p(e,r),t)});return o.filter(function(e,n){return!o.some(function(t,r){return n>r&&e[0]===t[0]&&e[1]===t[1]})})},C=function(e,a){function u(e,n,t,r){_[e].forEach(function(e){"undefined"==typeof t||null===t?e(n,null,null):e(n,t,r)})}function f(){_.ready.forEach(function(e){e()})}function c(e){var n=e.split(":");if(2!==n.length)throw new Error("Invalid internal state! Not a valid geohash query: "+e);return n}function l(e){if(2!==e.length)throw new Error("Not a valid geohash query: "+e);return e[0]+":"+e[1]}function s(e,n){var t=O.orderByChild("g").startAt(e[0]).endAt(e[1]);t.off("child_added",n.childAddedCallback),t.off("child_removed",n.childRemovedCallback),t.off("child_changed",n.childChangedCallback),t.off("value",n.valueCallback)}function h(){for(var e=Object.keys(q),n=e.length,t=0;n>t;++t){var r=e[t],i=q[r];if(i.active===!1){var o=c(r);s(o,i),delete q[r]}}for(e=Object.keys(F),n=e.length,t=0;n>t;++t){var a=e[t];if(!y(F[a].geohash)){if(F[a].isInQuery)throw new Error("Internal State error, trying to remove location that is still in query");delete F[a]}}N=!1,null!==A&&(clearTimeout(A),A=null)}function d(e,n){v(n);var t,r,a=F.hasOwnProperty(e)?F[e].isInQuery:!1,f=F.hasOwnProperty(e)?F[e].location:null;t=i.distance(n,P),r=G>=t,F[e]={location:n,distanceFromCenter:t,isInQuery:r,geohash:p(n,o)},r&&!a?u("key_entered",e,n,t):!r||null===f||n[0]===f[0]&&n[1]===f[1]?!r&&a&&u("key_exited",e,n,t):u("key_moved",e,n,t)}function y(e){for(var n=Object.keys(q),t=n.length,r=0;t>r;++r){var i=n[r];if(q.hasOwnProperty(i)){var o=c(i);if(e>=o[0]&&e<=o[1])return!0}}return!1}function g(e,n){var t=F[e];if(delete F[e],"undefined"!=typeof t&&t.isInQuery){var r=n?i.distance(n,P):null;u("key_exited",e,n,r)}}function b(e){d(t(e),n(e.val()))}function w(e){d(t(e),n(e.val()))}function k(e){var r=t(e);F.hasOwnProperty(r)&&O.child(r).once("value",function(e){var t=null===e.val()?null:n(e.val()),i=null!==t?p(t):null;y(i)||g(r,t)})}function M(e){var n=x.indexOf(e);n>-1&&x.splice(n,1),I=0===x.length,I&&f()}function E(){var e=j(P,1e3*G).map(l);e=e.filter(function(n,t){return e.indexOf(n)===t});for(var n=Object.keys(q),t=n.length,r=0;t>r;++r){var i=n[r],o=e.indexOf(i);-1===o?q[i].active=!1:(q[i].active=!0,e.splice(o,1))}N===!1&&Object.keys(q).length>25&&(N=!0,A=setTimeout(h,10)),x=e.slice(),e.forEach(function(e){var n=c(e),t=O.orderByChild("g").startAt(n[0]).endAt(n[1]),r=t.on("child_added",b),i=t.on("child_removed",k),o=t.on("child_changed",w),a=t.on("value",function(){t.off("value",a),M(e)});q[e]={active:!0,childAddedCallback:r,childRemovedCallback:i,childChangedCallback:o,valueCallback:a}}),0===e.length&&M()}if(this.center=function(){return P},this.radius=function(){return G},this.updateCriteria=function(e){m(e),P=e.center||P,G=e.radius||G;for(var n=Object.keys(F),t=n.length,r=0;t>r;++r){var o=n[r];if(C===!0)break;var a=F[o],f=a.isInQuery;a.distanceFromCenter=i.distance(a.location,P),a.isInQuery=a.distanceFromCenter<=G,f&&!a.isInQuery?u("key_exited",o,a.location,a.distanceFromCenter):!f&&a.isInQuery&&u("key_entered",o,a.location,a.distanceFromCenter)}I=!1,E()},this.on=function(e,n){if(-1===["ready","key_entered","key_exited","key_moved"].indexOf(e))throw new Error('event type must be "ready", "key_entered", "key_exited", or "key_moved"');if("function"!=typeof n)throw new Error("callback must be a function");if(_[e].push(n),"key_entered"===e)for(var t=Object.keys(F),i=t.length,o=0;i>o;++o){var a=t[o],u=F[a];"undefined"!=typeof u&&u.isInQuery&&n(a,u.location,u.distanceFromCenter)}return"ready"===e&&I&&n(),new r(function(){_[e].splice(_[e].indexOf(n),1)})},this.cancel=function(){C=!0,_={ready:[],key_entered:[],key_exited:[],key_moved:[]};for(var e=Object.keys(q),n=e.length,t=0;n>t;++t){var r=e[t],i=c(r);s(i,q[r]),delete q[r]}F={},clearInterval(Q)},"[object Object]"!==Object.prototype.toString.call(e))throw new Error("firebaseRef must be an instance of Firebase");var x,O=e,_={ready:[],key_entered:[],key_exited:[],key_moved:[]},C=!1,I=!1,F={},q={},N=!1,A=null,Q=setInterval(function(){N===!1&&h()},1e4);m(a,!0);var P=a.center,G=a.radius;E()};return i}();"undefined"!=typeof module&&"undefined"!=typeof process&&(module.exports=GeoFire);