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Filename : jquery-numerator.js
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/* 
 *   jQuery Numerator Plugin 0.2.1
 *   https://github.com/garethdn/jquery-numerator
 *
 *   Copyright 2015, Gareth Nolan
 *   http://ie.linkedin.com/in/garethnolan/

 *   Based on jQuery Boilerplate by Zeno Rocha with the help of Addy Osmani
 *   http://jqueryboilerplate.com
 *
 *   Licensed under the MIT license:
 *   http://www.opensource.org/licenses/MIT
 */

;(function (factory) {
    'use strict';
    if (typeof define === 'function' && define.amd) {
        // AMD is used - Register as an anonymous module.
        define(['jquery'], factory);
    } else if (typeof exports === 'object') {
        factory(require('jquery'));
    } else {
        // Neither AMD nor CommonJS used. Use global variables.
        if (typeof jQuery === 'undefined') {
            throw 'jquery-numerator requires jQuery to be loaded first';
        }
        factory(jQuery);
    }
}(function ($) {

    var pluginName = "numerator",
    defaults = {
        easing: 'swing',
        duration: 500,
        delimiter: undefined,
        rounding: 0,
        toValue: undefined,
        fromValue: undefined,
        queue: false,
        onStart: function(){},
        onStep: function(){},
        onProgress: function(){},
        onComplete: function(){}
    };

    function Plugin ( element, options ) {
        this.element = element;
        this.settings = $.extend( {}, defaults, options );
        this._defaults = defaults;
        this._name = pluginName;
        this.init();
    }

    Plugin.prototype = {

        init: function () {
            this.parseElement();
            this.setValue();
        },

        parseElement: function () {
            var elText = $.trim($(this.element).text());

            this.settings.fromValue = this.settings.fromValue || this.format(elText);
        },

        setValue: function() {
            var self = this;

            $({value: self.settings.fromValue}).animate({value: self.settings.toValue}, {

                duration: parseInt(self.settings.duration, 10),

                easing: self.settings.easing,

                start: self.settings.onStart,

                step: function(now, fx) {
                    $(self.element).text(self.format(now));
                    // accepts two params - (now, fx)
                    self.settings.onStep(now, fx);
                },

                // accepts three params - (animation object, progress ratio, time remaining(ms))
                progress: self.settings.onProgress,

                complete: self.settings.onComplete
            });
        },

        format: function(value){
            var self = this;

            if ( parseInt(this.settings.rounding ) < 1) {
                value = parseInt(value, 10);
            } else {
                value = parseFloat(value).toFixed( parseInt(this.settings.rounding) );
            }

            if (self.settings.delimiter) {
                return this.delimit(value)
            } else {
                return value;
            } 
        },

        // TODO: Add comments to this function
        delimit: function(value){
            var self = this;

            value = value.toString();

            if (self.settings.rounding && parseInt(self.settings.rounding, 10) > 0) {
                var decimals = value.substring( (value.length - (self.settings.rounding + 1)), value.length ),
                    wholeValue = value.substring( 0, (value.length - (self.settings.rounding + 1)));

                return self.addDelimiter(wholeValue) + decimals;
            } else {
                return self.addDelimiter(value);
            }
        },

        addDelimiter: function(value){
            return value.toString().replace(/\B(?=(\d{3})+(?!\d))/g, this.settings.delimiter);
        }
    };

    $.fn[ pluginName ] = function ( options ) {
        return this.each(function() {
            if ( $.data( this, "plugin_" + pluginName ) ) {
                $.data(this, 'plugin_' + pluginName, null);
            }
            $.data( this, "plugin_" + pluginName, new Plugin( this, options ) );
        });
    };

}));