(function() {

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/**

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* Debounce.

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*

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* @param {Function} func

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* @param {number} wait

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* @param {boolean} immediate

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*/

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function debounce(func, wait, immediate) {

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'use strict';

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var timeout;

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wait = (typeof wait !== 'undefined') ? wait : 20;

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immediate = (typeof immediate !== 'undefined') ? immediate : true;

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return function() {

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var context = this, args = arguments;

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var later = function() {

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timeout = null;

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if (!immediate) {

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func.apply(context, args);

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}

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};

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var callNow = immediate && !timeout;

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clearTimeout(timeout);

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timeout = setTimeout(later, wait);

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if (callNow) {

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func.apply(context, args);

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}

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};

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}

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/**

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* Prepends an element to a container.

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*

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* @param {Element} container

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* @param {Element} element

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*/

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function prependElement(container, element) {

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if (container.firstChild.nextSibling) {

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return container.insertBefore(element, container.firstChild.nextSibling);

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} else {

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return container.appendChild(element);

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}

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}

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/**

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* Shows an element by adding a hidden className.

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*

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* @param {Element} element

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*/

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function showButton(element) {

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// classList.remove is not supported in IE11.

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element.className = element.className.replace('is-empty', '');

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}

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/**

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* Hides an element by removing the hidden className.

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*

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* @param {Element} element

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*/

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function hideButton(element) {

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// classList.add is not supported in IE11.

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if (!element.classList.contains('is-empty')) {

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element.className += ' is-empty';

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}

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}

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/**

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* Returns the currently available space in the menu container.

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*

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* @returns {number} Available space

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*/

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function getAvailableSpace( button, container ) {

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return container.offsetWidth - button.offsetWidth - 22;

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}

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/**

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* Returns whether the current menu is overflowing or not.

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*

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* @returns {boolean} Is overflowing

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*/

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function isOverflowingNavivation( list, button, container ) {

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return list.offsetWidth > getAvailableSpace( button, container );

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}

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/**

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* Set menu container variable.

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*/

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var navContainer = document.querySelector('.main-navigation');

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var breaks = [];

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/**

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* Let’s bail if we our menu doesn't exist.

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*/

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if ( ! navContainer ) {

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return;

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}

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/**

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* Refreshes the list item from the menu depending on the menu size.

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*/

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function updateNavigationMenu( container ) {

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/**

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* Let’s bail if our menu is empty.

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*/

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if ( ! container.parentNode.querySelector('.main-menu[id]') ) {

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return;

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}

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// Adds the necessary UI to operate the menu.

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var visibleList = container.parentNode.querySelector('.main-menu[id]');

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var hiddenList = visibleList.parentNode.nextElementSibling.querySelector('.hidden-links');

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var toggleButton = visibleList.parentNode.nextElementSibling.querySelector('.main-menu-more-toggle');

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if ( isOverflowingNavivation( visibleList, toggleButton, container ) ) {

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// Record the width of the list.

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breaks.push( visibleList.offsetWidth );

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// Move last item to the hidden list.

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prependElement( hiddenList, ! visibleList.lastChild || null === visibleList.lastChild ? visibleList.previousElementSibling : visibleList.lastChild );

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// Show the toggle button.

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showButton( toggleButton );

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} else {

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// There is space for another item in the nav.

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if ( getAvailableSpace( toggleButton, container ) > breaks[breaks.length - 1] ) {

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// Move the item to the visible list.

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visibleList.appendChild( hiddenList.firstChild.nextSibling );

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breaks.pop();

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}

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// Hide the dropdown btn if hidden list is empty.

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if (breaks.length < 2) {

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hideButton( toggleButton );

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}

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}

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// Recur if the visible list is still overflowing the nav.

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if ( isOverflowingNavivation( visibleList, toggleButton, container ) ) {

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updateNavigationMenu( container );

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}

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}

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/**

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* Run our priority+ function as soon as the document is `ready`.

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*/

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document.addEventListener( 'DOMContentLoaded', function() {

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updateNavigationMenu( navContainer );

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// Also, run our priority+ function on selective refresh in the customizer.

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var hasSelectiveRefresh = (

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'undefined' !== typeof wp &&

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wp.customize &&

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wp.customize.selectiveRefresh &&

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wp.customize.navMenusPreview.NavMenuInstancePartial

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);

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if ( hasSelectiveRefresh ) {

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// Re-run our priority+ function on Nav Menu partial refreshes.

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wp.customize.selectiveRefresh.bind( 'partial-content-rendered', function ( placement ) {

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var isNewNavMenu = (

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placement &&

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placement.partial.id.includes( 'nav_menu_instance' ) &&

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'null' !== placement.container[0].parentNode &&

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placement.container[0].parentNode.classList.contains( 'main-navigation' )

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);

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if ( isNewNavMenu ) {

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updateNavigationMenu( placement.container[0].parentNode );

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}

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});

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}

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});

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/**

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* Run our priority+ function on load.

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*/

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window.addEventListener( 'load', function() {

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updateNavigationMenu( navContainer );

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});

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/**

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* Run our priority+ function every time the window resizes.

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*/

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var isResizing = false;

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window.addEventListener( 'resize',

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debounce( function() {

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if ( isResizing ) {

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return;

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}

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isResizing = true;

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setTimeout( function() {

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updateNavigationMenu( navContainer );

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isResizing = false;

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}, 150 );

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} )

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);

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/**

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* Run our priority+ function.

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*/

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updateNavigationMenu( navContainer );

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})();

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