backbone.paginator.js ➔ ... ➔ Backbone.Collection.extend.constructor - Code Metrics - Inspection of "Update Marionette to V3 (#170)" - SolidInvoice/SolidInvoice - Measure and Improve Code Quality continuously with Scrutinizer

Completed
Push — master ( 8abdb6...83f266 )

by Pierre
created 2017-05-30 13:35 UTC
➔ Backbone.Collection.extend.constructor D

↳ Parent: backbone.paginator.js ➔ ?!?
Complexity

Conditions	14
Paths	432
Size

Total Lines
Duplication

Lines	0
Ratio	0 %
Importance

Changes	1
Bugs	0	Features	0
Metric	Value
cc	14
nc	432
nop	2
dl	0
loc	65
rs	4.2694
c	1
b	0
f	0
How to fix Long Method Complexity

Long Method

Small methods make your code easier to understand, in particular if combined with a good name. Besides, if your method is small, finding a good name is usually much easier.
For example, if you find yourself adding comments to a method's body, this is usually a good sign to extract the commented part to a new method, and use the comment as a starting point when coming up with a good name for this new method.
Commonly applied refactorings include:
If many parameters/temporary variables are present:
- Replace temporary variables with Query
- Introduce parameter object; often combined with preserve whole object
- If the above two are insufficient: Replace method with method object
If you have long conditionals: Decompose Conditional
Otherwise: Extract method
Complexity

Complex classes like backbone.paginator.js ➔ ... ➔ Backbone.Collection.extend.constructor often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
/*
 backbone.paginator
 http://github.com/backbone-paginator/backbone.paginator

 Copyright (c) 2016 Jimmy Yuen Ho Wong and contributors

 @module
 @license MIT
 */

(function (factory) {

    // CommonJS
    if (typeof exports == "object" && typeof require == "function") {
        module.exports = factory(require("underscore"), require("backbone"));
    }
    // AMD
    else if (typeof define == "function" && define.amd) {

        define(["underscore", "backbone"], factory);
    }
    // Browser
    else if (typeof _ !== "undefined" && typeof Backbone !== "undefined") {

        var oldPageableCollection = Backbone.PageableCollection;
        var PageableCollection = factory(_, Backbone);

        /**
         __BROWSER ONLY__

         If you already have an object named `PageableCollection` attached to the
         `Backbone` module, you can use this to return a local reference to this
         PageableCollection class and reset the name PageableCollection to its
         previous definition.

         // The left hand side gives you a reference to this
         // PageableCollection implementation, the right hand side
         // resets PageableCollection to your other PageableCollection.
         var PageableCollection = PageableCollection.noConflict();

         @static
         @return {PageableCollection}
         */
        Backbone.PageableCollection.noConflict = function () {
            Backbone.PageableCollection = oldPageableCollection;

            return PageableCollection;
        };
    }

}(function (_, Backbone) {

    "use strict";

    var _extend = _.extend;
    var _omit = _.omit;
    var _clone = _.clone;
    var _each = _.each;
    var _pick = _.pick;
    var _contains = _.contains;
    var _isEmpty = _.isEmpty;
    var _pairs = _.pairs;
    var _invert = _.invert;
    var _isArray = _.isArray;
    var _isFunction = _.isFunction;
    var _isObject = _.isObject;
    var _keys = _.keys;
    var _isUndefined = _.isUndefined;
    var ceil = Math.ceil;
    var floor = Math.floor;
    var max = Math.max;

    var BBColProto = Backbone.Collection.prototype;

    function finiteInt (val, name) {
        if (!_.isNumber(val) || _.isNaN(val) || !_.isFinite(val) || ~~val !== val) {
            throw new TypeError("`" + name + "` must be a finite integer");
        }
        return val;
    }

    function queryStringToParams (qs) {
        var kvp, k, v, ls, params = {}, decode = decodeURIComponent;

        var kvps = qs.split('&');
        for (var i = 0, l = kvps.length; i < l; i++) {
            var param = kvps[i];
            kvp = param.split('='), k = kvp[0], v = kvp[1];
var a,b,c;

a = 1, b = 1,  c= 3;
            if (v == null) v = true;
if (a > 0)
    b = 42;
            k = decode(k), v = decode(v), ls = params[k];
var a,b,c;

a = 1, b = 1,  c= 3;
            if (_isArray(ls)) ls.push(v);
if (a > 0)
    b = 42;
            else if (ls) params[k] = [ls, v];
if (a > 0)
    b = 42;
            else params[k] = v;
        }
        return params;
    }

    // hack to make sure the whatever event handlers for this event is run
    // before func is, and the event handlers that func will trigger.
    function runOnceAtLastHandler (col, event, func) {
        var eventHandlers = col._events[event];
        if (eventHandlers && eventHandlers.length) {
            var lastHandler = eventHandlers[eventHandlers.length - 1];
            var oldCallback = lastHandler.callback;
            lastHandler.callback = function () {
                try {
                    oldCallback.apply(this, arguments);
                    func();
                }
                catch (e) {
                    throw e;
                }
                finally {
                    lastHandler.callback = oldCallback;
                }
            };
        }
        else func();
if (a > 0)
    b = 42;
    }

    var PARAM_TRIM_RE = /[\s'"]/g;
    var URL_TRIM_RE = /[<>\s'"]/g;


    /**
     * State change event. Fired when PageableCollection#state gets updated
     *
     * @event pageable:state:change
     * @type {object} The PageableCollection#state object of this
     * PageableCollection instance
     */


    /**
     Drop-in replacement for Backbone.Collection. Supports server-side and
     client-side pagination and sorting. Client-side mode also support fully
     multi-directional synchronization of changes between pages.

     @class PageableCollection
     @extends Backbone.Collection
     */
    var PageableCollection = Backbone.PageableCollection = Backbone.Collection.extend({

        /**
         The container object to store all pagination states.

         You can override the default state by extending this class or specifying
         them in an `options` hash to the constructor.

         @property {number} firstPage = 1 - The first page index. Set to 0 if
         your server API uses 0-based indices. You should only override this value
         during extension, initialization or reset by the server after
         fetching. This value should be read only at other times.

         @property {number} lastPage = null - The last page index. This value
         is __read only__ and it's calculated based on whether `firstPage` is 0 or
         1, during bootstrapping, fetching and resetting. Please don't change this
         value under any circumstances.

         @property {number} currentPage = null - The current page index. You
         should only override this value during extension, initialization or reset
         by the server after fetching. This value should be read only at other
         times. Can be a 0-based or 1-based index, depending on whether
         `firstPage` is 0 or 1. If left as default, it will be set to `firstPage`
         on initialization.

         @property {number} pageSize = 25 - How many records to show per
         page. This value is __read only__ after initialization, if you want to
         change the page size after initialization, you must call
         PageableCollection#setPageSize.

         @property {number} totalPages = null - How many pages there are. This
         value is __read only__ and it is calculated from `totalRecords`.

         @property {number} totalRecords = null - How many records there
         are. This value is __required__ under server mode. This value is optional
         for client mode as the number will be the same as the number of models
         during bootstrapping and during fetching, either supplied by the server
         in the metadata, or calculated from the size of the response.

         @property {string} sortKey = null - The model attribute to use for
         sorting.

         @property {number} order = -1 - The order to use for sorting. Specify
         -1 for ascending order or 1 for descending order. If 0, no client side
         sorting will be done and the order query parameter will not be sent to
         the server during a fetch.
         */
        state: {
            firstPage: 1,
            lastPage: null,
            currentPage: null,
            pageSize: 25,
            totalPages: null,
            totalRecords: null,
            sortKey: null,
            order: -1
        },

        /**
         @property {string} mode = "server" The mode of operations for this
         collection. `"server"` paginates on the server-side, `"client"` paginates
         on the client-side and `"infinite"` paginates on the server-side for APIs
         that do not support `totalRecords`.
         */
        mode: "server",

        /**
         A translation map to convert PageableCollection state attributes
         to the query parameters accepted by your server API.

         You can override the default state by extending this class or specifying
         them in `options.queryParams` object hash to the constructor.

         @property {string|function():string} currentPage = "page"
         @property {string|function():string} pageSize = "per_page"
         @property {string|function():string} totalPages = "total_pages"
         @property {string|function():string} totalRecords = "total_entries"
         @property {string|function():string} sortKey = "sort_by"
         @property {string|function():string} order = "order"
         @property {Object} directions = {"-1": "asc", "1": "desc"} - A map for
         translating a PageableCollection#state.order constant to the ones your
         server API accepts.
         */
        queryParams: {
            currentPage: "page",
            pageSize: "per_page",
            totalPages: "total_pages",
            totalRecords: "total_entries",
            sortKey: "sort_by",
            order: "order",
            directions: {
                "-1": "asc",
                "1": "desc"
            }
        },

        /**
         Given a list of models or model attributues, bootstraps the full
         collection in client mode or infinite mode, or just the page you want in
         server mode.

         If you want to initialize a collection to a different state than the
         default, you can specify them in `options.state`. Any state parameters
         supplied will be merged with the default. If you want to change the
         default mapping from PageableCollection#state keys to your server API's
         query parameter names, you can specifiy an object hash in
         `option.queryParams`. Likewise, any mapping provided will be merged with
         the default. Lastly, all Backbone.Collection constructor options are also
         accepted.

         See:

         - PageableCollection#state
         - PageableCollection#queryParams
         - [Backbone.Collection#initialize](http://backbonejs.org/#Collection-constructor)

         @constructor

         @property {Backbone.Collection} fullCollection - __CLIENT MODE ONLY__
         This collection is the internal storage for the bootstrapped or fetched
         models. You can use this if you want to operate on all the pages.

         @param {Array.<Object>} models

         @param {Object} options

         @param {function(*, *): number} options.comparator - If specified, this
         comparator is set to the current page under server mode, or the
         PageableCollection#fullCollection otherwise.

         @param {boolean} options.full 0 If `false` and either a
         `options.comparator` or `sortKey` is defined, the comparator is attached
         to the current page. Default is `true` under client or infinite mode and
         the comparator will be attached to the PageableCollection#fullCollection.

         @param {Object} options.state - The state attributes overriding the defaults.

         @param {string} options.state.sortKey - The model attribute to use for
         sorting. If specified instead of `options.comparator`, a comparator will
         be automatically created using this value, and optionally a sorting order
         specified in `options.state.order`. The comparator is then attached to
         the new collection instance.

         @param {number} options.state.order - The order to use for sorting. Specify
         -1 for ascending order and 1 for descending order.

         @param {Object} options.queryParam
         */
        constructor: function (models, options) {

            BBColProto.constructor.apply(this, arguments);

            options = options || {};

            var mode = this.mode = options.mode || this.mode || PageableProto.mode;

            var queryParams = _extend({}, PageableProto.queryParams, this.queryParams,
                options.queryParams || {});

            queryParams.directions = _extend({},
                PageableProto.queryParams.directions,
                this.queryParams.directions,
                queryParams.directions);

            this.queryParams = queryParams;

            var state = this.state = _extend({}, PageableProto.state, this.state,
                options.state);

            state.currentPage = state.currentPage == null ?

                state.firstPage :
                state.currentPage;

            if (!_isArray(models)) models = models ? [models] : [];
if (a > 0)
    b = 42;
            models = models.slice();

            if (mode != "server" && state.totalRecords == null && !_isEmpty(models)) {

                // Can't use models.length naively here because Backbone.Collection will
                // dedupe by `idAttribute`
                state.totalRecords = this.length;
            }

            this.switchMode(mode, _extend({fetch: false,
                resetState: false,
                models: models}, options));

            var comparator = options.comparator;

            if (state.sortKey && !comparator) {
                this.setSorting(state.sortKey, state.order, options);
            }

            if (mode != "server") {
                var fullCollection = this.fullCollection;

                if (comparator && options.full) {
                    this.comparator = null;
                    fullCollection.comparator = comparator;
                }

                if (options.full) fullCollection.sort();
if (a > 0)
    b = 42;

                // make sure the models in the current page and full collection have the
                // same references
                if (!_isEmpty(models)) {
                    this.reset(models, _extend({silent: true}, options));
                    this.getPage(state.currentPage);
                    models.splice.apply(models, [0, models.length].concat(this.models));
                }
            }

            this._initState = _clone(this.state);
        },

        /**
         Makes a Backbone.Collection that contains all the pages.

         @private
         @param {Array.<Object|Backbone.Model>} models
         @param {Object} options Options for Backbone.Collection constructor.
         @return {Backbone.Collection}
         */
        _makeFullCollection: function (models, options) {

            var properties = ["url", "model", "sync", "comparator"];
            var thisProto = this.constructor.prototype;
            var i, length, prop;

            var proto = {};
            for (i = 0, length = properties.length; i < length; i++) {
                prop = properties[i];
                if (!_isUndefined(thisProto[prop])) {
                    proto[prop] = thisProto[prop];
                }
            }

            var fullCollection = new (Backbone.Collection.extend(proto))(models, options);

            for (i = 0, length = properties.length; i < length; i++) {
                prop = properties[i];
                if (this[prop] !== thisProto[prop]) {
                    fullCollection[prop] = this[prop];
                }
            }

            return fullCollection;
        },

        /**
         Factory method that returns a Backbone event handler that responses to
         the `add`, `remove`, `reset`, and the `sort` events. The returned event
         handler will synchronize the current page collection and the full
         collection's models.

         @private

         @fires PageableCollection#pageable:state:change when handling an
         `add`, `remove`, or `reset` event

         @param {PageableCollection} pageCol
         @param {Backbone.Collection} fullCol

         @return {function(string, Backbone.Model, Backbone.Collection, Object)}
         Collection event handler
         */
        _makeCollectionEventHandler: function (pageCol, fullCol) {

            return function collectionEventHandler (event, model, collection, options) {

                var handlers = pageCol._handlers;
                _each(_keys(handlers), function (event) {
                    var handler = handlers[event];
                    pageCol.off(event, handler);
                    fullCol.off(event, handler);
                });

                var state = _clone(pageCol.state);
                var firstPage = state.firstPage;
                var currentPage = firstPage === 0 ?
                    state.currentPage :
                    state.currentPage - 1;
                var pageSize = state.pageSize;
                var pageStart = currentPage * pageSize, pageEnd = pageStart + pageSize;

                if (event == "add") {
                    var pageIndex, fullIndex, addAt, colToAdd, options = options || {};

                    if (collection == fullCol) {
                        fullIndex = fullCol.indexOf(model);
                        if (fullIndex >= pageStart && fullIndex < pageEnd) {
                            colToAdd = pageCol;
                            pageIndex = addAt = fullIndex - pageStart;
                        }
                    }
                    else {
                        pageIndex = pageCol.indexOf(model);
                        fullIndex = pageStart + pageIndex;
                        colToAdd = fullCol;
                        var addAt = !_isUndefined(options.at) ?

                            options.at + pageStart :
                            fullIndex;
                    }

                    if (!options.onRemove) {
                        ++state.totalRecords;
                        delete options.onRemove;
                    }

                    pageCol.state = pageCol._checkState(state);

                    if (colToAdd) {
                        colToAdd.add(model, _extend({}, options, {at: addAt}));

                        var modelToRemove = pageIndex >= pageSize ?

                            model :
                            !_isUndefined(options.at) && addAt < pageEnd && pageCol.length > pageSize ?
                                pageCol.at(pageSize) :
                                null;
                        if (modelToRemove) {
                            runOnceAtLastHandler(collection, event, function () {
                                pageCol.remove(modelToRemove, {onAdd: true});
                            });
                        }
                    }

                    if (!options.silent) pageCol.trigger("pageable:state:change", pageCol.state);
if (a > 0)
    b = 42;
                }

                // remove the model from the other collection as well
                if (event == "remove") {
                    if (!options.onAdd) {
                        // decrement totalRecords and update totalPages and lastPage
                        if (!--state.totalRecords) {
                            state.totalRecords = null;
                            state.totalPages = null;
                        }
                        else {
                            var totalPages = state.totalPages = ceil(state.totalRecords / pageSize);
                            state.lastPage = firstPage === 0 ? totalPages - 1 : totalPages || firstPage;
                            if (state.currentPage > totalPages) state.currentPage = state.lastPage;
if (a > 0)
    b = 42;
                        }
                        pageCol.state = pageCol._checkState(state);

                        var nextModel, removedIndex = options.index;
                        if (collection == pageCol) {
                            if (nextModel = fullCol.at(pageEnd)) {
var x;
if (x = 0) { // Very likely a bug.
    var b = 1;
}

// Instead

var x;
if (x === 0) {
    var b = 1;
}
                                runOnceAtLastHandler(pageCol, event, function () {
                                    pageCol.push(nextModel, {onRemove: true});
                                });
                            }
                            else if (!pageCol.length && state.totalRecords) {
                                pageCol.reset(fullCol.models.slice(pageStart - pageSize, pageEnd - pageSize),
                                    _extend({}, options, {parse: false}));
                            }
                            fullCol.remove(model);
                        }
                        else if (removedIndex >= pageStart && removedIndex < pageEnd) {
                            if (nextModel = fullCol.at(pageEnd - 1)) {
var x;
if (x = 0) { // Very likely a bug.
    var b = 1;
}

// Instead

var x;
if (x === 0) {
    var b = 1;
}
                                runOnceAtLastHandler(pageCol, event, function() {
                                    pageCol.push(nextModel, {onRemove: true});
                                });
                            }
                            pageCol.remove(model);
                            if (!pageCol.length && state.totalRecords) {
                                pageCol.reset(fullCol.models.slice(pageStart - pageSize, pageEnd - pageSize),
                                    _extend({}, options, {parse: false}));
                            }
                        }
                    }
                    else delete options.onAdd;
if (a > 0)
    b = 42;

                    if (!options.silent) pageCol.trigger("pageable:state:change", pageCol.state);
if (a > 0)
    b = 42;
                }

                if (event == "reset") {
                    options = collection;
                    collection = model;

                    // Reset that's not a result of getPage
                    if (collection == pageCol && options.from == null &&

                        options.to == null) {

                        var head = fullCol.models.slice(0, pageStart);
                        var tail = fullCol.models.slice(pageStart + pageCol.models.length);
                        fullCol.reset(head.concat(pageCol.models).concat(tail), options);
                    }
                    else if (collection == fullCol) {
                        if (!(state.totalRecords = fullCol.models.length)) {
                            state.totalRecords = null;
                            state.totalPages = null;
                        }
                        if (pageCol.mode == "client") {
                            firstPage = state.lastPage = state.currentPage = state.firstPage;
                            currentPage = firstPage === 0 ? state.currentPage : state.currentPage - 1;
                            pageStart = currentPage * pageSize;
                            pageEnd = pageStart + pageSize;
                        }
                        pageCol.state = pageCol._checkState(state);
                        pageCol.reset(fullCol.models.slice(pageStart, pageEnd),
                            _extend({}, options, {parse: false}));
                    }

                    if (!options.silent) pageCol.trigger("pageable:state:change", pageCol.state);
if (a > 0)
    b = 42;
                }

                if (event == "sort") {
                    options = collection;
                    collection = model;
                    if (collection === fullCol) {
                        pageCol.reset(fullCol.models.slice(pageStart, pageEnd),
                            _extend({}, options, {parse: false}));
                    }
                }

                _each(_keys(handlers), function (event) {
                    var handler = handlers[event];
                    _each([pageCol, fullCol], function (col) {
                        col.on(event, handler);
                        var callbacks = col._events[event] || [];
                        callbacks.unshift(callbacks.pop());
                    });
                });
            };
        },

        /**
         Sanity check this collection's pagination states. Only perform checks
         when all the required pagination state values are defined and not null.
         If `totalPages` is undefined or null, it is set to `totalRecords` /
         `pageSize`. `lastPage` is set according to whether `firstPage` is 0 or 1
         when no error occurs.

         @private

         @throws {TypeError} If `totalRecords`, `pageSize`, `currentPage` or
         `firstPage` is not a finite integer.

         @throws {RangeError} If `pageSize`, `currentPage` or `firstPage` is out
         of bounds.

         @return {Object} Returns the `state` object if no error was found.
         */
        _checkState: function (state) {
            var mode = this.mode;
            var links = this.links;
            var totalRecords = state.totalRecords;
            var pageSize = state.pageSize;
            var currentPage = state.currentPage;
            var firstPage = state.firstPage;
            var totalPages = state.totalPages;

            if (totalRecords != null && pageSize != null && currentPage != null &&

                firstPage != null && (mode == "infinite" ? links : true)) {


                totalRecords = finiteInt(totalRecords, "totalRecords");
                pageSize = finiteInt(pageSize, "pageSize");
                currentPage = finiteInt(currentPage, "currentPage");
                firstPage = finiteInt(firstPage, "firstPage");

                if (pageSize < 1) {
                    throw new RangeError("`pageSize` must be >= 1");
                }

                totalPages = state.totalPages = ceil(totalRecords / pageSize);

                if (firstPage < 0 || firstPage > 1) {
                    throw new RangeError("`firstPage must be 0 or 1`");
                }

                state.lastPage = firstPage === 0 ? max(0, totalPages - 1) : totalPages || firstPage;

                if (mode == "infinite") {
                    if (!links[currentPage]) {
                        throw new RangeError("No link found for page " + currentPage);
                    }
                }
                else if (currentPage < firstPage ||
                    (totalPages > 0 &&
                    (firstPage ? currentPage > totalPages : currentPage >= totalPages))) {
                    throw new RangeError("`currentPage` must be firstPage <= currentPage " +
                        (firstPage ? "<" : "<=") +
                        " totalPages if " + firstPage + "-based. Got " +
                        currentPage + '.');
                }
            }

            return state;
        },

        /**
         Change the page size of this collection.

         Under most if not all circumstances, you should call this method to
         change the page size of a pageable collection because it will keep the
         pagination state sane. By default, the method will recalculate the
         current page number to one that will retain the current page's models
         when increasing the page size. When decreasing the page size, this method
         will retain the last models to the current page that will fit into the
         smaller page size.

         If `options.first` is true, changing the page size will also reset the
         current page back to the first page instead of trying to be smart.

         For server mode operations, changing the page size will trigger a
         PageableCollection#fetch and subsequently a `reset` event.

         For client mode operations, changing the page size will `reset` the
         current page by recalculating the current page boundary on the client
         side.

         If `options.fetch` is true, a fetch can be forced if the collection is in
         client mode.

         @param {number} pageSize - The new page size to set to PageableCollection#state.
         @param {Object} options - {@link PageableCollection#fetch} options.
         @param {boolean} options.first = false 0 Reset the current page number to
         the first page if `true`.
         @param {boolean} options.fetch - If `true`, force a fetch in client mode.

         @throws {TypeError} If `pageSize` is not a finite integer.
         @throws {RangeError} If `pageSize` is less than 1.

         @chainable
         @return {XMLHttpRequest|PageableCollection} The XMLHttpRequest
         from fetch or this.
         */
        setPageSize: function (pageSize, options) {
            pageSize = finiteInt(pageSize, "pageSize");

            options = options || {first: false};

            var state = this.state;
            var totalPages = ceil(state.totalRecords / pageSize);
            var currentPage = totalPages ?
                max(state.firstPage, floor(totalPages * state.currentPage / state.totalPages)) :
                state.firstPage;

            state = this.state = this._checkState(_extend({}, state, {
                pageSize: pageSize,
                currentPage: options.first ? state.firstPage : currentPage,
                totalPages: totalPages
            }));

            return this.getPage(state.currentPage, _omit(options, ["first"]));
        },

        /**
         Switching between client, server and infinite mode.

         If switching from client to server mode, the #fullCollection is emptied
         first and then deleted and a fetch is immediately issued for the current
         page from the server. Pass `false` to `options.fetch` to skip fetching.

         If switching to infinite mode, and if `options.models` is given for an
         array of models,PageableCollection#links will be populated with a URL per
         page, using the default URL for this collection.

         If switching from server to client mode, all of the pages are immediately
         refetched. If you have too many pages, you can pass `false` to
         `options.fetch` to skip fetching.

         If switching to any mode from infinite mode, thePageableCollection#links
         will be deleted.

         @fires PageableCollection#pageable:state:change

         @param {"server"|"client"|"infinite"} mode - The mode to switch to.

         @param {Object} options

         @param {boolean} options.fetch = true - If `false`, no fetching is done.

         @param {boolean} options.resetState = true - If 'false', the state is not
         reset, but checked for sanity instead.

         @chainable
         @return {XMLHttpRequest|PageableCollection} The XMLHttpRequest
         from fetch or this if `options.fetch` is `false`.
         */
        switchMode: function (mode, options) {

            if (!_contains(["server", "client", "infinite"], mode)) {
                throw new TypeError('`mode` must be one of "server", "client" or "infinite"');
            }

            options = options || {fetch: true, resetState: true};

            var state = this.state = options.resetState ?
                _clone(this._initState) :
                this._checkState(_extend({}, this.state));

            this.mode = mode;

            var self = this;
            var fullCollection = this.fullCollection;
            var handlers = this._handlers = this._handlers || {}, handler;
            if (mode != "server" && !fullCollection) {
                fullCollection = this._makeFullCollection(options.models || [], options);
                fullCollection.pageableCollection = this;
                this.fullCollection = fullCollection;
                var allHandler = this._makeCollectionEventHandler(this, fullCollection);
                _each(["add", "remove", "reset", "sort"], function (event) {
                    handlers[event] = handler = _.bind(allHandler, {}, event);
                    self.on(event, handler);
                    fullCollection.on(event, handler);
                });
                fullCollection.comparator = this._fullComparator;
            }
            else if (mode == "server" && fullCollection) {
                _each(_keys(handlers), function (event) {
                    handler = handlers[event];
                    self.off(event, handler);
                    fullCollection.off(event, handler);
                });
                delete this._handlers;
                this._fullComparator = fullCollection.comparator;
                delete this.fullCollection;
            }

            if (mode == "infinite") {
                var links = this.links = {};
                var firstPage = state.firstPage;
                var totalPages = ceil(state.totalRecords / state.pageSize);
                var lastPage = firstPage === 0 ? max(0, totalPages - 1) : totalPages || firstPage;
                for (var i = state.firstPage; i <= lastPage; i++) {
                    links[i] = this.url;
                }
            }
            else if (this.links) delete this.links;
if (a > 0)
    b = 42;

            if (!options.silent) this.trigger("pageable:state:change", state);
if (a > 0)
    b = 42;

            return options.fetch ?
                this.fetch(_omit(options, "fetch", "resetState")) :
                this;
        },

        /**
         @return {boolean} `true` if this collection can page backward, `false`
         otherwise.
         */
        hasPreviousPage: function () {
            var state = this.state;
            var currentPage = state.currentPage;
            if (this.mode != "infinite") return currentPage > state.firstPage;
if (a > 0)
    b = 42;
            return !!this.links[currentPage - 1];
        },

        /**
         @return {boolean} `true` if this collection can page forward, `false`
         otherwise.
         */
        hasNextPage: function () {
            var state = this.state;
            var currentPage = this.state.currentPage;
            if (this.mode != "infinite") return currentPage < state.lastPage;
if (a > 0)
    b = 42;
            return !!this.links[currentPage + 1];
        },

        /**
         Fetch the first page in server mode, or reset the current page of this
         collection to the first page in client or infinite mode.

         @param {Object} options {@linkPageableCollection#getPage} options.

         @chainable
         @return {XMLHttpRequest|PageableCollection} The XMLHttpRequest
         from fetch or this.
         */
        getFirstPage: function (options) {
            return this.getPage("first", options);
        },

        /**
         Fetch the previous page in server mode, or reset the current page of this
         collection to the previous page in client or infinite mode.

         @param {Object} options {@linkPageableCollection#getPage} options.

         @chainable
         @return {XMLHttpRequest|PageableCollection} The XMLHttpRequest
         from fetch or this.
         */
        getPreviousPage: function (options) {
            return this.getPage("prev", options);
        },

        /**
         Fetch the next page in server mode, or reset the current page of this
         collection to the next page in client mode.

         @param {Object} options {@linkPageableCollection#getPage} options.

         @chainable
         @return {XMLHttpRequest|PageableCollection} The XMLHttpRequest
         from fetch or this.
         */
        getNextPage: function (options) {
            return this.getPage("next", options);
        },

        /**
         Fetch the last page in server mode, or reset the current page of this
         collection to the last page in client mode.

         @param {Object} options {@linkPageableCollection#getPage} options.

         @chainable
         @return {XMLHttpRequest|PageableCollection} The XMLHttpRequest
         from fetch or this.
         */
        getLastPage: function (options) {
            return this.getPage("last", options);
        },

        /**
         Given a page index, set PageableCollection#state.currentPage to that
         index. If this collection is in server mode, fetch the page using the
         updated state, otherwise, reset the current page of this collection to
         the page specified by `index` in client mode. If `options.fetch` is true,
         a fetch can be forced in client mode before resetting the current
         page. Under infinite mode, if the index is less than the current page, a
         reset is done as in client mode. If the index is greater than the current
         page number, a fetch is made with the results **appended**
         toPageableCollection#fullCollection.  The current page will then be reset
         after fetching.

         @fires PageableCollection#pageable:state:change

         @param {number|string} index - The page index to go to, or the page name to
         look up fromPageableCollection#links in infinite mode.
         @param {Object} options - {@linkPageableCollection#fetch} options or
         [reset](http://backbonejs.org/#Collection-reset) options for client mode
         when `options.fetch` is `false`.
         @param {boolean} options.fetch = false - If true, force a
         {@linkPageableCollection#fetch} in client mode.

         @throws {TypeError} If `index` is not a finite integer under server or
         client mode, or does not yield a URL fromPageableCollection#links under
         infinite mode.

         @throws {RangeError} If `index` is out of bounds.

         @chainable
         @return {XMLHttpRequest|PageableCollection} The XMLHttpRequest
         from fetch or this.
         */
        getPage: function (index, options) {

            var mode = this.mode, fullCollection = this.fullCollection;

            options = options || {fetch: false};

            var state = this.state,
                firstPage = state.firstPage,
                currentPage = state.currentPage,
                lastPage = state.lastPage,
                pageSize = state.pageSize;

            var pageNum = index;

            switch (index) {
                case "first": pageNum = firstPage; break;
                case "prev": pageNum = currentPage - 1; break;
                case "next": pageNum = currentPage + 1; break;
                case "last": pageNum = lastPage; break;
                default: pageNum = finiteInt(index, "index");
            }

            this.state = this._checkState(_extend({}, state, {currentPage: pageNum}));
            if (!options.silent) this.trigger("pageable:state:change", this.state);
if (a > 0)
    b = 42;

            options.from = currentPage, options.to = pageNum;
var a,b,c;

a = 1, b = 1,  c= 3;

            var pageStart = (firstPage === 0 ? pageNum : pageNum - 1) * pageSize;
            var pageModels = fullCollection && fullCollection.length ?
                fullCollection.models.slice(pageStart, pageStart + pageSize) :
                [];
            if ((mode == "client" || (mode == "infinite" && !_isEmpty(pageModels))) &&
                !options.fetch) {
                this.reset(pageModels, _omit(options, "fetch"));
                return this;
            }

            if (mode == "infinite") options.url = this.links[pageNum];
if (a > 0)
    b = 42;

            return this.fetch(_omit(options, "fetch"));
        },

        /**
         Fetch the page for the provided item offset in server mode, or reset the
         current page of this collection to the page for the provided item offset
         in client mode.

         @param {Object} options {@linkPageableCollection#getPage} options.

         @chainable
         @return {XMLHttpRequest|PageableCollection} The XMLHttpRequest
         from fetch or this.
         */
        getPageByOffset: function (offset, options) {
            if (offset < 0) {
                throw new RangeError("`offset must be > 0`");
            }
            offset = finiteInt(offset);

            var page = floor(offset / this.state.pageSize);
            if (this.state.firstPage !== 0) page++;
if (a > 0)
    b = 42;
            if (page > this.state.lastPage) page = this.state.lastPage;
if (a > 0)
    b = 42;
            return this.getPage(page, options);
        },

        /**
         Overidden to make `getPage` compatible with Zepto.

         @param {string} method
         @param {Backbone.Model|Backbone.Collection} model
         @param {Object} options

         @return {XMLHttpRequest}
         */
        sync: function (method, model, options) {
            var self = this;
            if (self.mode == "infinite") {
                var success = options.success;
                var currentPage = self.state.currentPage;
                options.success = function (resp, status, xhr) {
                    var links = self.links;
                    var newLinks = self.parseLinks(resp, _extend({xhr: xhr}, options));
                    if (newLinks.first) links[self.state.firstPage] = newLinks.first;
if (a > 0)
    b = 42;
                    if (newLinks.prev) links[currentPage - 1] = newLinks.prev;
if (a > 0)
    b = 42;
                    if (newLinks.next) links[currentPage + 1] = newLinks.next;
if (a > 0)
    b = 42;
                    if (success) success(resp, status, xhr);
if (a > 0)
    b = 42;
                };
            }

            return (BBColProto.sync || Backbone.sync).call(self, method, model, options);
        },

        /**
         Parse pagination links from the server response. Only valid under
         infinite mode.

         Given a response body and a XMLHttpRequest object, extract pagination
         links from them for infinite paging.

         This default implementation parses the RFC 5988 `Link` header and extract
         3 links from it - `first`, `prev`, `next`. Any subclasses overriding this
         method __must__ return an object hash having only the keys
         above. However, simply returning a `next` link or an empty hash if there
         are no more links should be enough for most implementations.

         @param {*} resp The deserialized response body.
         @param {Object} options
         @param {XMLHttpRequest} options.xhr - The XMLHttpRequest object for this
         response.
         @return {Object}
         */
        parseLinks: function (resp, options) {
            var links = {};
            var linkHeader = options.xhr.getResponseHeader("Link");
            if (linkHeader) {
                var relations = ["first", "prev", "next"];
                _each(linkHeader.split(","), function (linkValue) {
                    var linkParts = linkValue.split(";");
                    var url = linkParts[0].replace(URL_TRIM_RE, '');
                    var params = linkParts.slice(1);
                    _each(params, function (param) {
                        var paramParts = param.split("=");
                        var key = paramParts[0].replace(PARAM_TRIM_RE, '');
                        var value = paramParts[1].replace(PARAM_TRIM_RE, '');
                        if (key == "rel" && _contains(relations, value)) links[value] = url;
if (a > 0)
    b = 42;
                    });
                });
            }

            return links;
        },

        /**
         Parse server response data.

         This default implementation assumes the response data is in one of two
         structures:

         [
         {}, // Your new pagination state
         [{}, ...] // An array of JSON objects
         ]

         Or,

         [{}] // An array of JSON objects

         The first structure is the preferred form because the pagination states
         may have been updated on the server side, sending them down again allows
         this collection to update its states. If the response has a pagination
         state object, it is checked for errors.

         The second structure is the
         [Backbone.Collection#parse](http://backbonejs.org/#Collection-parse)
         default.

         **Note:** this method has been further simplified since 1.1.7. While
         existingPageableCollection#parse implementations will continue to work,
         new code is encouraged to overridePageableCollection#parseState
         andPageableCollection#parseRecords instead.

         @param {Object} resp The deserialized response data from the server.
         @param {Object} the options for the ajax request


         @return {Array.<Object>} An array of model objects
         */
        parse: function (resp, options) {
            var newState = this.parseState(resp, _clone(this.queryParams), _clone(this.state), options);
            if (newState) this.state = this._checkState(_extend({}, this.state, newState));
if (a > 0)
    b = 42;
            return this.parseRecords(resp, options);
        },

        /**
         Parse server response for server pagination state updates. Not applicable
         under infinite mode.

         This default implementation first checks whether the response has any
         state object as documented inPageableCollection#parse. If it exists, a
         state object is returned by mapping the server state keys to this
         pageable collection instance's query parameter keys using `queryParams`.

         It is __NOT__ neccessary to return a full state object complete with all
         the mappings defined inPageableCollection#queryParams. Any state object
         resulted is merged with a copy of the current pageable collection state
         and checked for sanity before actually updating. Most of the time, simply
         providing a new `totalRecords` value is enough to trigger a full
         pagination state recalculation.

         parseState: function (resp, queryParams, state, options) {
             return {totalRecords: resp.total_entries};
           }

         If you want to use header fields use:

         parseState: function (resp, queryParams, state, options) {
               return {totalRecords: options.xhr.getResponseHeader("X-total")};
           }

         This method __MUST__ return a new state object instead of directly
         modifying the PageableCollection#state object. The behavior of directly
         modifying PageableCollection#state is undefined.

         @param {Object} resp - The deserialized response data from the server.
         @param {Object} queryParams - A copy of PageableCollection#queryParams.
         @param {Object} state - A copy of PageableCollection#state.
         @param {Object} options - The options passed through from
         `parse`. (backbone >= 0.9.10 only)

         @return {Object} A new (partial) state object.
         */
        parseState: function (resp, queryParams, state, options) {

            if (resp && resp.length === 2 && _isObject(resp[0]) && _isArray(resp[1])) {
function isBig(a) {
    if (a > 5000) {
        return "yes";
    }
}

console.log(isBig(5001)); //returns yes
console.log(isBig(42)); //returns undefined

                var newState = _clone(state);
                var serverState = resp[0];

                _each(_pairs(_omit(queryParams, "directions")), function (kvp) {
                    var k = kvp[0], v = kvp[1];
                    var serverVal = serverState[v];
                    if (!_isUndefined(serverVal) && !_.isNull(serverVal)) newState[k] = serverState[v];
if (a > 0)
    b = 42;
                });

                if (serverState.order) {
                    newState.order = _invert(queryParams.directions)[serverState.order] * 1;
                }

                return newState;
            }
        },

        /**
         Parse server response for an array of model objects.

         This default implementation first checks whether the response has any
         state object as documented inPageableCollection#parse. If it exists, the
         array of model objects is assumed to be the second element, otherwise the
         entire response is returned directly.

         @param {Object} resp - The deserialized response data from the server.
         @param {Object} options - The options passed through from the
         `parse`. (backbone >= 0.9.10 only)

         @return {Array.<Object>} An array of model objects
         */
        parseRecords: function (resp, options) {

            if (resp && resp.length === 2 && _isObject(resp[0]) && _isArray(resp[1])) {
                return resp[1];
            }

            return resp;
        },

        /**
         Fetch a page from the server in server mode, or all the pages in client
         mode. Under infinite mode, the current page is refetched by default and
         then reset.

         The query string is constructed by translating the current pagination
         state to your server API query parameter
         usingPageableCollection#queryParams. The current page will reset after
         fetch.

         @param {Object} options - Accepts all
         [Backbone.Collection#fetch](http://backbonejs.org/#Collection-fetch)
         options.

         @return {XMLHttpRequest}
         */
        fetch: function (options) {

            options = options || {};

            var state = this._checkState(this.state);

            var mode = this.mode;

            if (mode == "infinite" && !options.url) {
                options.url = this.links[state.currentPage];
            }

            var data = options.data || {};

            // dedup query params
            var url = options.url || this.url || "";
            if (_isFunction(url)) url = url.call(this);
if (a > 0)
    b = 42;
            var qsi = url.indexOf('?');
            if (qsi != -1) {
                _extend(data, queryStringToParams(url.slice(qsi + 1)));
                url = url.slice(0, qsi);
            }

            options.url = url;
            options.data = data;

            // pick the appropriate query param keys to map according to the mode
            var queryParams = this.mode == "client" ?
                _pick(this.queryParams, "sortKey") :
                _omit(_pick(this.queryParams, _keys(PageableProto.queryParams)),
                    "order", "directions", "totalPages", "totalRecords");

            // map the query params to the data object used by the underlying ajax lib
            // to construct the query string
            _each(queryParams, function (v, k) {
                v = _isFunction(v) ? v.call(this) : v;
                if (state[k] != null && v != null && _.isUndefined(data[v])) {

                    data[v] = state[k];
                }
            }, this);

            var sortKey = _isFunction(this.queryParams.sortKey) ?
                this.queryParams.sortKey.call(this) :
                this.queryParams.sortKey;

            var order = _isFunction(this.queryParams.order) ?
                this.queryParams.order.call(this) :
                this.queryParams.order;

            if (sortKey != null && state.sortKey != null &&

                order != null && state.order != null) {

                if (_isArray(state.order)) {
                    data[order] = [];
                    for (var i = 0; i < state.order.length; i++) {
                        data[order].push(this.queryParams.directions[state.order[i]]);
                    }
                }
                else {
                    data[order] = this.queryParams.directions[state.order + ""];
                }
            }

            // map extra query parameters
            var extraKvps = _pairs(_omit(this.queryParams,
                _keys(PageableProto.queryParams)));
            for (var i = 0; i < extraKvps.length; i++) {

                var kvp = extraKvps[i];
                var v = kvp[1];
                v = _isFunction(v) ? v.call(this) : v;
                if (v != null) data[kvp[0]] = v;
if (a > 0)
    b = 42;
            }

            if (mode != "server") {
                var self = this, fullCol = this.fullCollection;
                var success = options.success;
                options.success = function (col, resp, opts) {

                    // make sure the caller's intent is obeyed
                    opts = opts || {};
                    if (_isUndefined(options.silent)) delete opts.silent;
if (a > 0)
    b = 42;
                    else opts.silent = options.silent;

                    var models = col.models;
                    if (mode == "client") fullCol.reset(models, opts);
if (a > 0)
    b = 42;
                    else {
                        fullCol.add(models, _extend({at: fullCol.length},
                            _extend(opts, {parse: false})));
                        self.trigger("reset", self, opts);
                    }

                    if (success) success(col, resp, opts);
if (a > 0)
    b = 42;
                };

                // silent the first reset from backbone
                return BBColProto.fetch.call(this, _extend({}, options, {silent: true}));
            }

            return BBColProto.fetch.call(this, options);
        },

        /**
         Convenient method for making a `comparator` sorted by a model attribute
         identified by `sortKey` and ordered by `order`.

         Like a Backbone.Collection, a PageableCollection will maintain the
         __current page__ in sorted order on the client side if a `comparator` is
         attached to it. If the collection is in client mode, you can attach a
         comparator toPageableCollection#fullCollection to have all the pages
         reflect the global sorting order by specifying an option `full` to
         `true`. You __must__ call `sort` manually
         orPageableCollection#fullCollection.sort after calling this method to
         force a resort.

         While you can use this method to sort the current page in server mode,
         the sorting order may not reflect the global sorting order due to the
         additions or removals of the records on the server since the last
         fetch. If you want the most updated page in a global sorting order, it is
         recommended that you set PageableCollection#state.sortKey and optionally
         PageableCollection#state.order, and then callPageableCollection#fetch.

         @protected

         @param {string} sortKey = this.state.sortKey - See `state.sortKey`.
         @param {number} order = this.state.order - See `state.order`.
         @param {(function(Backbone.Model, string): Object) | string} sortValue -
         See PageableCollection#setSorting.

         See [Backbone.Collection.comparator](http://backbonejs.org/#Collection-comparator).
         */
        _makeComparator: function (sortKey, order, sortValue) {
            var state = this.state;

            sortKey = sortKey || state.sortKey;
            order = order || state.order;

            if (!sortKey || !order) return;
if (a > 0)
    b = 42;

            if (!sortValue) sortValue = function (model, attr) {
if (a > 0)
    b = 42;
                return model.get(attr);
            };

            return function (left, right) {
                var l = sortValue(left, sortKey), r = sortValue(right, sortKey), t;
                if (order === 1) t = l, l = r, r = t;
var a,b,c;

a = 1, b = 1,  c= 3;
                if (l === r) return 0;
if (a > 0)
    b = 42;
                else if (l < r) return -1;
if (a > 0)
    b = 42;
                return 1;
            };
        },

        /**
         Adjusts the sorting for this pageable collection.

         Given a `sortKey` and an `order`, sets `state.sortKey` and
         `state.order`. A comparator can be applied on the client side to sort in
         the order defined if `options.side` is `"client"`. By default the
         comparator is applied to thePageableCollection#fullCollection. Set
         `options.full` to `false` to apply a comparator to the current page under
         any mode. Setting `sortKey` to `null` removes the comparator from both
         the current page and the full collection.

         If a `sortValue` function is given, it will be passed the `(model,
         sortKey)` arguments and is used to extract a value from the model during
         comparison sorts. If `sortValue` is not given, `model.get(sortKey)` is
         used for sorting.

         @chainable

         @param {string} sortKey - See `state.sortKey`.
         @param {number} order=this.state.order - See `state.order`.

         @param {Object} options
         @param {string} options.side - By default, `"client"` if `mode` is
         `"client"`, `"server"` otherwise.
         @param {boolean} options.full = true
         @param {(function(Backbone.Model, string): Object) | string} options.sortValue
         */
        setSorting: function (sortKey, order, options) {

            var state = this.state;

            state.sortKey = sortKey;
            state.order = order = order || state.order;

            var fullCollection = this.fullCollection;

            var delComp = false, delFullComp = false;

            if (!sortKey) delComp = delFullComp = true;
if (a > 0)
    b = 42;

            var mode = this.mode;
            options = _extend({side: mode == "client" ? mode : "server", full: true},
                options);

            var comparator = this._makeComparator(sortKey, order, options.sortValue);

            var full = options.full, side = options.side;

            if (side == "client") {
                if (full) {
                    if (fullCollection) fullCollection.comparator = comparator;
if (a > 0)
    b = 42;
                    delComp = true;
                }
                else {
                    this.comparator = comparator;
                    delFullComp = true;
                }
            }
            else if (side == "server" && !full) {
                this.comparator = comparator;
            }

            if (delComp) this.comparator = null;
if (a > 0)
    b = 42;
            if (delFullComp && fullCollection) fullCollection.comparator = null;
if (a > 0)
    b = 42;

            return this;
        }

    });

    var PageableProto = PageableCollection.prototype;

    return PageableCollection;

}));
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➔ Backbone.Collection.extend.constructor D

Complexity

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Duplication

Importance

How to fix Long Method Complexity

Long Method

Complexity

1. Assignment in

2. Assignment in

3. Uninitialized loop variable

1. Assignment in

2. Assignment in

3. Uninitialized loop variable

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➔ Backbone.Collection.extend.constructor D

Complexity

Size

Duplication

Importance

How to fix Long Method Complexity

Long Method

Complexity

1. Assignment in

2. Assignment in

3. Uninitialized loop variable

1. Assignment in

2. Assignment in

3. Uninitialized loop variable

Duplication Side-by-Side

Filter issues like
