/**
* @ngdoc service
* @name sfSelect
* @kind function
*
*/
angular.module('schemaForm').factory('sfSelect', ['sfPath', function(sfPath) {
var numRe = /^\d+$/;
/**
* @description
* Utility method to access deep properties without
* throwing errors when things are not defined.
* Can also set a value in a deep structure, creating objects when missing
* ex.
* var foo = Select('address.contact.name',obj)
* Select('address.contact.name',obj,'Leeroy')
*
* @param {string} projection A dot path to the property you want to get/set
* @param {object} obj (optional) The object to project on, defaults to 'this'
* @param {Any} valueToSet (opional) The value to set, if parts of the path of
* the projection is missing empty objects will be created.
* @returns {Any|undefined} returns the value at the end of the projection path
* or undefined if there is none.
*/
return function(projection, obj, valueToSet) {
Iif (!obj) {
obj = this;
}
//Support [] array syntax
var parts = typeof projection === 'string' ? sfPath.parse(projection) : projection;
if (typeof valueToSet !== 'undefined' && parts.length === 1) {
//special case, just setting one variable
obj[parts[0]] = valueToSet;
return obj;
}
if (typeof valueToSet !== 'undefined' &&
typeof obj[parts[0]] === 'undefined') {
// We need to look ahead to check if array is appropriate
obj[parts[0]] = parts.length > 2 && numRe.test(parts[1]) ? [] : {};
}
var value = obj[parts[0]];
for (var i = 1; i < parts.length; i++) {
// Special case: We allow JSON Form syntax for arrays using empty brackets
// These will of course not work here so we exit if they are found.
Iif (parts[i] === '') {
return undefined;
}
if (typeof valueToSet !== 'undefined') {
if (i === parts.length - 1) {
//last step. Let's set the value
value[parts[i]] = valueToSet;
return valueToSet;
} else {
// Make sure to create new objects on the way if they are not there.
// We need to look ahead to check if array is appropriate
var tmp = value[parts[i]];
if (typeof tmp === 'undefined' || tmp === null) {
tmp = numRe.test(parts[i + 1]) ? [] : {};
value[parts[i]] = tmp;
}
value = tmp;
}
} else if (value) {
//Just get nex value.
value = value[parts[i]];
}
}
return value;
};
}]);
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