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if (typeof window.addComment !== 'undefined' && typeof window.addComment.config !== 'undefined') {\n    Object.assign(config, window.addComment.config);\n  }\n\n  // Cross browser MutationObserver.\n  let MutationObserver = window.MutationObserver || window.WebKitMutationObserver || window.MozMutationObserver;\n\n  // Check browser cuts the mustard.\n  let cutsTheMustard = 'querySelector' in document && 'addEventListener' in window;\n\n  /*\n   * Check browser supports dataset.\n   * !! sets the variable to true if the property exists.\n   */\n  let supportsDataset = !!document.documentElement.dataset;\n\n  // For holding the comments wrapper element.\n  let commentsWrapperElement;\n\n  // For holding the cancel element.\n  let cancelElement;\n\n  // For holding the comment form element.\n  let commentFormElement;\n\n  // The respond element.\n  let respondElement;\n\n  // The mutation observer.\n  let observer;\n\n  if (cutsTheMustard && document.readyState !== 'loading') {\n    ready()\n  } else if (cutsTheMustard) {\n    window.addEventListener('DOMContentLoaded', ready, false)\n  }\n\n  /**\n   * Sets up object variables after the DOM is ready.\n   *\n   * @since 5.1.1\n   */\n  function ready () {\n    // Initialise the events.\n    init();\n\n    // Set up a MutationObserver to check for comments loaded late.\n    observeChanges()\n  }\n\n  /**\n   * Add events to links classed .comment-reply-link.\n   *\n   * Searches the context for reply links and adds the JavaScript events\n   * required to move the comment form. To allow for lazy loading of\n   * comments this method is exposed as window.commentReply.init().\n   *\n   * @since 5.1.0\n   *\n   * @memberOf addComment\n   *\n   * @param {HTMLElement} context The parent DOM element to search for links.\n   */\n  function init (context) {\n    if (!cutsTheMustard) {\n      return\n    }\n\n    // Get required elements.\n    commentsWrapperElement = getElementById(config.commentsWrapperId);\n    cancelElement = getElementById(config.cancelReplyId);\n    commentFormElement = getElementById(config.commentFormId);\n\n    // No cancel element, no replies.\n    if (!cancelElement) {\n      return\n    }\n\n    // childNodes is a handy check to ensure the context is a HTMLElement.\n    if (!context || !context.childNodes) {\n      context = commentsWrapperElement\n    }\n\n    cancelElement.addEventListener('touchstart', cancelEvent);\n    cancelElement.addEventListener('click', cancelEvent);\n\n    // Submit the comment form when the user types [Ctrl] or [Cmd] + [Enter].\n    let submitFormHandler = function (e) {\n      if ((e.metaKey || e.ctrlKey) && e.keyCode === 13) {\n        commentFormElement.removeEventListener('keydown', submitFormHandler);\n        e.preventDefault();\n        // The submit button ID is 'submit' so we can't call commentFormElement.submit(). Click it instead.\n        commentFormElement.submit.click();\n        return false\n      }\n    };\n\n    if (commentFormElement) {\n      commentFormElement.addEventListener('keydown', submitFormHandler)\n    }\n\n    let links = [];\n    links = links.concat(Array.from(replyLinks(context)));\n    links = links.concat(Array.from(openFormButtons(context)));\n\n    let element;\n    for (let i = 0, l = links.length; i < l; i++) {\n      element = links[i];\n\n      element.addEventListener('touchstart', clickEvent);\n      element.addEventListener('click', clickEvent)\n    }\n  }\n\n  /**\n   * Creates a mutation observer to check for newly inserted comments.\n   *\n   * @since 5.1.0\n   */\n  function observeChanges () {\n    if (!MutationObserver) {\n      return\n    }\n\n    let observerOptions = {\n      childList: true,\n      subtree: true\n    };\n\n    observer = new MutationObserver(handleChanges);\n    observer.observe(document.body, observerOptions)\n  }\n\n  /**\n   * Handles DOM changes, calling init() if any new nodes are added.\n   *\n   * @since 5.1.0\n   *\n   * @param {Array} mutationRecords Array of MutationRecord objects.\n   */\n  function handleChanges (mutationRecords) {\n    let i = mutationRecords.length;\n\n    while (i--) {\n      // Call init() once if any record in this set adds nodes.\n      if (mutationRecords[i].addedNodes.length) {\n        init();\n        return\n      }\n    }\n  }\n\n  /**\n   * Return all links classed .comment-reply-link.\n   *\n   * @since 5.1.0\n   *\n   * @param {HTMLElement} context The parent DOM element to search for links.\n   *\n   * @return {HTMLCollection|NodeList|Array}\n   */\n  function replyLinks (context) {\n    return getElementsByClass(config.commentReplyClass, context)\n  }\n\n  /**\n   * Return all buttons classed .js-open-comment-form.\n   *\n   * Custom method of ours.\n   *\n   * @param {HTMLElement} context The parent DOM element to search for links.\n   *\n   * @return {HTMLCollection|NodeList|Array}\n   */\n  function openFormButtons (context) {\n    return getElementsByClass(config.openFormButtonClass, context)\n  }\n\n  /**\n   * Return all elements with the provided class.\n   *\n   * Custom method of ours.\n   *\n   * @param {string} selectorClass\n   * @param {HTMLElement} context The parent DOM element to search for links.\n   *\n   * @return {HTMLCollection|NodeList|Array}\n   */\n  function getElementsByClass (selectorClass, context) {\n    let allElements;\n\n    // childNodes is a handy check to ensure the context is a HTMLElement.\n    if (!context || !context.childNodes) {\n      context = document\n    }\n\n    if (document.getElementsByClassName) {\n      // Fastest.\n      allElements = context.getElementsByClassName(selectorClass)\n    } else {\n      // Fast.\n      allElements = context.querySelectorAll('.' + selectorClass)\n    }\n\n    return allElements\n  }\n\n  /**\n   * Click event handler.\n   *\n   * @since 5.1.0\n   *\n   * @param {Event} event The calling event.\n   */\n  function clickEvent (event) {\n    let replyNode = getElementById(config.commentReplyTitleId);\n    let defaultReplyHeading = replyNode && replyNode.firstChild.textContent;\n    let replyLink = this,\n      commId = getDataAttribute(replyLink, 'belowelement'),\n      parentId = getDataAttribute(replyLink, 'commentid'),\n      respondId = getDataAttribute(replyLink, 'respondelement'),\n      postId = getDataAttribute(replyLink, 'postid'),\n      replyTo = getDataAttribute(replyLink, 'replyto') || defaultReplyHeading,\n      follow;\n\n    if (!commId || !respondId || !postId) {\n      /*\n       * Theme or plugin defines own link via custom `wp_list_comments()` callback\n       * and calls `moveForm()` either directly or via a custom event hook.\n       */\n      return\n    }\n\n    /*\n     * Third party comments systems can hook into this function via the global scope,\n     * therefore the click event needs to reference the global scope.\n     */\n    follow = window.addComment.moveForm(commId, parentId, respondId, postId, replyTo);\n    if (false === follow) {\n      event.preventDefault()\n    }\n  }\n\n  /**\n   * Cancel event handler.\n   *\n   * @since 5.1.0\n   *\n   * @param {Event} event The calling event.\n   */\n  function cancelEvent (event) {\n    let cancelLink = this;\n    let temporaryFormId = config.temporaryFormId;\n    let temporaryElement = getElementById(temporaryFormId);\n\n    if (!temporaryElement || !respondElement) {\n      // Conditions for cancel link fail.\n      return\n    }\n\n    getElementById(config.parentIdFieldId).value = '0';\n\n    // Move the respond form back in place of the temporary element.\n    let headingText = temporaryElement.textContent;\n    temporaryElement.parentNode.replaceChild(respondElement, temporaryElement);\n    cancelLink.style.display = 'none';\n    // Remove the \"flag\" (class) on the comments wrapper.\n    commentsWrapperElement.classList.remove(config.replyingFlagClass);\n\n    let replyHeadingElement = getElementById(config.commentReplyTitleId);\n    let replyHeadingTextNode = replyHeadingElement && replyHeadingElement.firstChild;\n    let replyLinkToParent = replyHeadingTextNode && replyHeadingTextNode.nextSibling;\n\n    if (replyHeadingTextNode && replyHeadingTextNode.nodeType === Node.TEXT_NODE && headingText) {\n      if (replyLinkToParent && 'A' === replyLinkToParent.nodeName && replyLinkToParent.id !== config.cancelReplyId) {\n        replyLinkToParent.style.display = ''\n      }\n\n      replyHeadingTextNode.textContent = headingText\n    } else {\n      // We will use the replyTo for the submit button text.\n      let submitButton = getElementById(config.commentFormSubmitId);\n      if (submitButton) {\n        submitButton.textContent = headingText\n      }\n    }\n\n    event.preventDefault()\n  }\n\n  /**\n   * Backward compatible getter of data-* attribute.\n   *\n   * Uses element.dataset if it exists, otherwise uses getAttribute.\n   *\n   * @since 5.1.0\n   *\n   * @param {HTMLElement} Element DOM element with the attribute.\n   * @param {string}      Attribute the attribute to get.\n   *\n   * @return {string}\n   */\n  function getDataAttribute (element, attribute) {\n    if (supportsDataset) {\n      return element.dataset[attribute]\n    } else {\n      return element.getAttribute('data-' + attribute)\n    }\n  }\n\n  /**\n   * Get element by ID.\n   *\n   * Local alias for document.getElementById.\n   *\n   * @since 5.1.0\n   *\n   * @param {HTMLElement} The requested element.\n   */\n  function getElementById (elementId) {\n    return document.getElementById(elementId)\n  }\n\n  /**\n   * Moves the reply form from its current position to a new location.\n   *\n   * @since 2.7.0\n   *\n   * @memberOf addComment\n   *\n   * @param {string} addBelowId HTML ID of element the form follows.\n   * @param {string} commentId  Database ID of comment being replied to.\n   * @param {string} respondId  HTML ID of 'respond' element.\n   * @param {string} postId     Database ID of the post.\n   * @param {string} replyTo    Form heading content.\n   */\n  function moveForm (addBelowId, commentId, respondId, postId, replyTo) {\n    // Get elements based on their IDs.\n    let addBelowElement = getElementById(addBelowId);\n    respondElement = getElementById(respondId);\n\n    // Get the hidden fields.\n    let parentIdField = getElementById(config.parentIdFieldId);\n    let postIdField = getElementById(config.postIdFieldId);\n    let element;\n\n    let replyHeading = getElementById(config.commentReplyTitleId);\n    let replyHeadingTextNode = replyHeading && replyHeading.firstChild;\n    let replyLinkToParent = replyHeadingTextNode && replyHeadingTextNode.nextSibling;\n\n    if (!addBelowElement || !respondElement || !parentIdField) {\n      // Missing key elements, fail.\n      return\n    }\n\n    if ('undefined' === typeof replyTo) {\n      replyTo = replyHeadingTextNode && replyHeadingTextNode.textContent\n    }\n\n    addPlaceHolder(respondElement);\n\n    // Set the value of the post.\n    if (postId && postIdField) {\n      postIdField.value = postId\n    }\n\n    parentIdField.value = commentId;\n\n    // Show the cancel link if the commentId is not zero.\n    if (commentId && '0' !== commentId) {\n      cancelElement.style.display = ''\n    }\n    // Insert the form in the new location.\n    addBelowElement.parentNode.insertBefore(respondElement, addBelowElement.nextSibling);\n    respondElement.classList.add('expanded');\n\n    // Handle reply related textual changes like heading or button text.\n    if (replyHeadingTextNode && replyHeadingTextNode.nodeType === Node.TEXT_NODE) {\n      if (replyLinkToParent && 'A' === replyLinkToParent.nodeName && replyLinkToParent.id !== config.cancelReplyId) {\n        replyLinkToParent.style.display = 'none'\n      }\n\n      replyHeadingTextNode.textContent = replyTo\n    } else {\n      // We will use the replyTo for the submit button text.\n      let submitButton = getElementById(config.commentFormSubmitId);\n      if (submitButton) {\n        submitButton.textContent = replyTo\n      }\n    }\n\n    /*\n     * This is for backward compatibility with third party commenting systems\n     * hooking into the event using older techniques.\n     */\n    cancelElement.onclick = function () {\n      return false\n    };\n\n    // Try to focus on the configured field.\n    let focusElement = getElementById(config.focusOnFieldId);\n    if (focusElement) {\n      focusElement.focus();\n      /*\n      * false is returned for backward compatibility with third party commenting systems\n      * hooking into this function.\n      */\n      return false\n    }\n    // Focus on the first field in the comment form.\n    try {\n      for (let i = 0; i < commentFormElement.elements.length; i++) {\n        element = commentFormElement.elements[i];\n        if ('button' === element.type) {\n          // We don't want to focus on buttons.\n          continue;\n        }\n\n\n        // Skip form elements that are hidden or disabled.\n        if ('hidden' === element.type || element.disabled || isCssHidden(element)) {\n          continue\n        }\n\n        element.focus();\n        // Stop after the first focusable element.\n        break\n      }\n    } catch (e) {\n\n    }\n\n    /*\n     * false is returned for backward compatibility with third party commenting systems\n     * hooking into this function.\n     */\n    return false\n  }\n\n  function isCssHidden(element) {\n    let cssHidden = false,\n      style;\n\n    // Get elements computed style.\n    if ('getComputedStyle' in window) {\n      // Modern browsers.\n      style = window.getComputedStyle(element)\n    } else if (document.documentElement.currentStyle) {\n      // IE 8.\n      style = element.currentStyle\n    }\n\n    /*\n     * For display none, do the same thing jQuery does. For visibility,\n     * check the element computed style since browsers are already doing\n     * the job for us. In fact, the visibility computed style is the actual\n     * computed value and already takes into account the element ancestors.\n     */\n    if ((element.offsetWidth <= 0 && element.offsetHeight <= 0) || style.visibility === 'hidden') {\n      cssHidden = true\n    }\n\n    return cssHidden;\n  }\n\n  /**\n   * Add placeholder element.\n   *\n   * Places a place holder element above the #respond element for\n   * the form to be returned to if needs be.\n   *\n   * @since 2.7.0\n   *\n   * @param {HTMLelement} respondElement the #respond element holding comment form.\n   */\n  function addPlaceHolder (respondElement) {\n    let temporaryFormId = config.temporaryFormId;\n    let temporaryElement = getElementById(temporaryFormId);\n    let replyElement = getElementById(config.commentReplyTitleId);\n    let initialHeadingText = replyElement ? replyElement.firstChild.textContent : '';\n    if (!replyElement) {\n      // We need to search for the submit button since that appears to be our means of contextul text, not the reply heading.\n      let submitButton = getElementById(config.commentFormSubmitId);\n      if (submitButton) {\n        initialHeadingText = submitButton.textContent\n      }\n    }\n\n    if (temporaryElement) {\n      // The element already exists - we want to move it.\n      respondElement.parentNode.insertBefore(temporaryElement, respondElement);\n      return\n    }\n\n    temporaryElement = document.createElement('div');\n    temporaryElement.id = temporaryFormId;\n    temporaryElement.style.display = 'none';\n    temporaryElement.textContent = initialHeadingText;\n    respondElement.parentNode.insertBefore(temporaryElement, respondElement);\n\n    // Add the \"flag\" (class) on the comments wrapper.\n    commentsWrapperElement.classList.add(config.replyingFlagClass)\n  }\n\n  return {\n    init: init,\n    moveForm: moveForm\n  }\n})(window);\n"]}