/* =============================================================

  * bootstrap-scrollspy.js v2.3.1

  * http://twitter.github.com/bootstrap/javascript.html#scrollspy

  * =============================================================

  * Copyright 2012 Twitter, Inc.

  *

  * Licensed under the Apache License, Version 2.0 (the "License");

  * you may not use this file except in compliance with the License.

  * You may obtain a copy of the License at

  *

  * http://www.apache.org/licenses/LICENSE-2.0

  *

  * Unless required by applicable law or agreed to in writing, software

  * distributed under the License is distributed on an "AS IS" BASIS,

  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  * See the License for the specific language governing permissions and

  * limitations under the License.

  * ============================================================== */

 !function ($) {

   "use strict"; // jshint ;_;

  /* SCROLLSPY CLASS DEFINITION

   * ========================== */

   function ScrollSpy(element, options) {

     var process = $.proxy(this.process, this)

       , $element = $(element).is('body') ? $(window) : $(element)

       , href

     this.options = $.extend({}, $.fn.scrollspy.defaults, options)

     this.$scrollElement = $element.on('scroll.scroll-spy.data-api', process)

     this.selector = (this.options.target

       || ((href = $(element).attr('href')) && href.replace(/.*(?=#[^\s]+$)/, '')) //strip for ie7

       || '') + ' .nav li > a'

     this.$body = $('body')

     this.refresh()

     this.process()

   }

   ScrollSpy.prototype = {

       constructor: ScrollSpy

     , refresh: function () {

         var self = this

           , $targets

         this.offsets = $([])

         this.targets = $([])

         $targets = this.$body

           .find(this.selector)

           .map(function () {

             var $el = $(this)

               , href = $el.data('target') || $el.attr('href')

               , $href = /^#\w/.test(href) && $(href)

             return ( $href

               && $href.length

               && [[ $href.position().top + (!$.isWindow(self.$scrollElement.get(0)) && self.$scrollElement.scrollTop()), href ]] ) || null

           })

           .sort(function (a, b) { return a[0] - b[0] })

           .each(function () {

             self.offsets.push(this[0])

             self.targets.push(this[1])

           })

       }

     , process: function () {

         var scrollTop = this.$scrollElement.scrollTop() + this.options.offset

           , scrollHeight = this.$scrollElement[0].scrollHeight || this.$body[0].scrollHeight

           , maxScroll = scrollHeight - this.$scrollElement.height()

           , offsets = this.offsets

           , targets = this.targets

           , activeTarget = this.activeTarget

           , i

         if (scrollTop >= maxScroll) {

           return activeTarget != (i = targets.last()[0])

             && this.activate ( i )

         }

         for (i = offsets.length; i--;) {

           activeTarget != targets[i]

             && scrollTop >= offsets[i]

             && (!offsets[i + 1] || scrollTop <= offsets[i + 1])

             && this.activate( targets[i] )

         }

       }

     , activate: function (target) {

         var active

           , selector

         this.activeTarget = target

         $(this.selector)

           .parent('.active')

           .removeClass('active')

         selector = this.selector

           + '[data-target="' + target + '"],'

           + this.selector + '[href="' + target + '"]'

         active = $(selector)

           .parent('li')

           .addClass('active')

         if (active.parent('.dropdown-menu').length)  {

           active = active.closest('li.dropdown').addClass('active')

         }

         active.trigger('activate')

       }

   }

  /* SCROLLSPY PLUGIN DEFINITION

   * =========================== */

   var old = $.fn.scrollspy

   $.fn.scrollspy = function (option) {

     return this.each(function () {

       var $this = $(this)

         , data = $this.data('scrollspy')

         , options = typeof option == 'object' && option

       if (!data) $this.data('scrollspy', (data = new ScrollSpy(this, options)))

       if (typeof option == 'string') data[option]()

     })

   }

   $.fn.scrollspy.Constructor = ScrollSpy

   $.fn.scrollspy.defaults = {

     offset: 10

   }

  /* SCROLLSPY NO CONFLICT

   * ===================== */

   $.fn.scrollspy.noConflict = function () {

     $.fn.scrollspy = old

     return this

   }

  /* SCROLLSPY DATA-API

   * ================== */

   $(window).on('load', function () {

     $('[data-spy="scroll"]').each(function () {

       var $spy = $(this)

       $spy.scrollspy($spy.data())

     })

   })

 }(window.jQuery);