mohsen-angular-leaflet-directive/src/services/leafletGeoJsonHelpers.js

angular-leaflet-directive - An AngularJS directive to easily interact with Leaflet maps

angular.module('leaflet-directive')
.service('leafletGeoJsonHelpers', function(leafletHelpers, leafletIterators) {
  var lHlp = leafletHelpers;
  var lIt = leafletIterators;
  var Point = function(lat, lng) {
    this.lat = lat;
    this.lng = lng;
    return this;
  };

  var _getLat = function(value) {
    if (Array.isArray(value) && value.length === 2) {
      return value[1];
    } else if (lHlp.isDefined(value.type) && value.type === 'Point') {
      return +value.coordinates[1];
    } else {
      return +value.lat;
    }
  };

  var _getLng = function(value) {
    if (Array.isArray(value) && value.length === 2) {
      return value[0];
    } else if (lHlp.isDefined(value.type) && value.type === 'Point') {
      return +value.coordinates[0];
    } else {
      return +value.lng;
    }
  };

  var _validateCoords = function(coords) {
    if (lHlp.isUndefined(coords)) {
      return false;
    }

    if (lHlp.isArray(coords)) {
      if (coords.length === 2 && lHlp.isNumber(coords[0]) && lHlp.isNumber(coords[1])) {
        return true;
      }
    } else if (lHlp.isDefined(coords.type)) {
      if (
          coords.type === 'Point' && lHlp.isArray(coords.coordinates) &&
          coords.coordinates.length === 2  &&
          lHlp.isNumber(coords.coordinates[0]) &&
          lHlp.isNumber(coords.coordinates[1])) {
        return true;
      }
    }

    var ret = lIt.all(['lat', 'lng'], function(pos) {
      return lHlp.isDefined(coords[pos]) && lHlp.isNumber(coords[pos]);
    });

    return ret;
  };

  var _getCoords = function(value) {
    if (!value || !_validateCoords(value)) {
      return;
    }

    var p =  null;
    if (Array.isArray(value) && value.length === 2) {
      p = new Point(value[1], value[0]);
    } else if (lHlp.isDefined(value.type) && value.type === 'Point') {
      p = new Point(value.coordinates[1], value.coordinates[0]);
    } else {
      return value;
    }

    //note angular.merge is avail in angular 1.4.X we might want to fill it here
    return angular.extend(value, p);//tap on lat, lng if it doesnt exist
  };

  return {
    getLat: _getLat,
    getLng: _getLng,
    validateCoords: _validateCoords,
    getCoords: _getCoords,
  };
});