AngularJS-Module: Stringify JSON Objects with circular dependencies

json_stringify_circular_for_angular.js

(function () {

    /* converted by @brakmic */
    /* original code: https://github.com/isaacs/json-stringify-safe */
    
    /* usage example:
    *
    *angular.module("myModule", ['jsonStringify'])
    *               .controller("MainCtrl", ['StringifyJsonService', MainCtrl]);
    *
    *function MainCtrl(StringifyJsonService){
    * var vm = this;
    * vm.myCircularJson = { /* values, values, values */ };
    /* vm.stringifyCircularJson = stringifyCircularJson;
    * 
    * function stringifyCircularJson(circularJson){
    *     console.log(StringifyJsonService.stringify(circularJson)); 
    *  }
    * }
    *
    * Example:
    *
    * <div ng-controller="MainCtrl as vm">
    *
    *   <input type="text" ng-model="vm.myCircularJson"/>
    *   <div ng-bind="vm.myCircularJson"></div>
    *   <div ng-bind="vm.stringifyCircularJson(vm.myCircularJson)"></div>
    * 
    * </div> */


    angular.module('jsonStringify', [])
    .factory('StringifyJsonService', StringifyJsonServiceFactory);

    function StringifyJsonServiceFactory() {
        var service = {};

        function getSerialize(fn, decycle) {
            var seen = [], keys = [];
            decycle = decycle || function (key, value) {
                return '[Circular ' + getPath(value, seen, keys) + ']'
            };
            return function (key, value) {
                var ret = value;
                if (typeof value === 'object' && value) {
                    if (seen.indexOf(value) !== -1)
                        ret = decycle(key, value);
                    else {
                        seen.push(value);
                        keys.push(key);
                    }
                }
                if (fn) ret = fn(key, ret);
                return ret;
            }
        }

        function getPath(value, seen, keys) {
            var index = seen.indexOf(value);
            var path = [keys[index]];
            for (index--; index >= 0; index--) {
                if (seen[index][path[0]] === value) {
                    value = seen[index];
                    path.unshift(keys[index]);
                }
            }
            return '~' + path.join('.');
        }

        service.stringify = function(obj, fn, spaces, decycle) {
            return JSON.stringify(obj, getSerialize(fn, decycle), spaces);
        }

        service.stringify.getSerialize = getSerialize;

        return service;
    }

}());