app.js

/* global instantsearch, CONFIG */

window.addEventListener('DOMContentLoaded', () => {
  const algoliaSettings = CONFIG.algolia;

  let search = instantsearch({
    appId         : algoliaSettings.appID,
    apiKey        : algoliaSettings.apiKey,
    indexName     : algoliaSettings.indexName,
    searchFunction: helper => {
      let searchInput = document.querySelector('#search-input input');
      if (searchInput.value) {
        helper.search();
      }
    }
  });

  window.pjax && search.on('render', () => {
    window.pjax.refresh(document.getElementById('algolia-hits'));
  });

  // Registering Widgets
  [
    instantsearch.widgets.searchBox({
      container  : '#search-input',
      placeholder: algoliaSettings.labels.input_placeholder
    }),

    instantsearch.widgets.stats({
      container: '#algolia-stats',
      templates: {
        body: data => {
          let stats = algoliaSettings.labels.hits_stats
            .replace(/\$\{hits}/, data.nbHits)
            .replace(/\$\{time}/, data.processingTimeMS);
          return `${stats}
            <span class="algolia-powered">
              <img src="${CONFIG.root}images/algolia_logo.svg" alt="Algolia">
            </span>
            <hr>`;
        }
      }
    }),

    instantsearch.widgets.hits({
      container  : '#algolia-hits',
      hitsPerPage: algoliaSettings.hits.per_page || 10,
      templates  : {
        item: data => {
          let link = data.permalink ? data.permalink : CONFIG.root + data.path;
          return `<a href="${link}" class="algolia-hit-item-link">${data._highlightResult.title.value}</a>`;
        },
        empty: data => {
          return `<div id="algolia-hits-empty">
              ${algoliaSettings.labels.hits_empty.replace(/\$\{query}/, data.query)}
            </div>`;
        }
      },
      cssClasses: {
        item: 'algolia-hit-item'
      }
    }),

    instantsearch.widgets.pagination({
      container    : '#algolia-pagination',
      scrollTo     : false,
      showFirstLast: false,
      labels       : {
        first   : '<i class="fa fa-angle-double-left"></i>',
        last    : '<i class="fa fa-angle-double-right"></i>',
        previous: '<i class="fa fa-angle-left"></i>',
        next    : '<i class="fa fa-angle-right"></i>'
      },
      cssClasses: {
        root    : 'pagination',
        item    : 'pagination-item',
        link    : 'page-number',
        active  : 'current',
        disabled: 'disabled-item'
      }
    })
  ].forEach(search.addWidget, search);

  search.start();

  // Handle and trigger popup window
  document.querySelector('.popup-trigger').addEventListener('click', () => {
    document.body.style.overflow = 'hidden';
    document.querySelector('.search-pop-overlay').style.display = 'block';
    document.querySelector('.popup').style.display = 'block';
    document.querySelector('#search-input input').focus();
  });

  // Monitor main search box
  const onPopupClose = () => {
    document.body.style.overflow = '';
    document.querySelector('.search-pop-overlay').style.display = 'none';
    document.querySelector('.popup').style.display = 'none';
  };

  document.querySelector('.search-pop-overlay').addEventListener('click', onPopupClose);
  document.querySelector('.popup-btn-close').addEventListener('click', onPopupClose);
  window.addEventListener('pjax:success', onPopupClose);
  window.addEventListener('keyup', event => {
    if (event.which === 27) {
      onPopupClose();
    }
  });
});

/* global CONFIG */

window.addEventListener('DOMContentLoaded', () => {
  'use strict';

  var doSaveScroll = () => {
    localStorage.setItem('bookmark' + location.pathname, window.scrollY);
  };

  var scrollToMark = () => {
    var top = localStorage.getItem('bookmark' + location.pathname);
    top = parseInt(top, 10);
    // If the page opens with a specific hash, just jump out
    if (!isNaN(top) && location.hash === '') {
      // Auto scroll to the position
      window.anime({
        targets  : [document.documentElement, document.body],
        duration : 200,
        easing   : 'linear',
        scrollTop: top
      });
    }
  };
  // Register everything
  var init = function(trigger) {
    // Create a link element
    var link = document.querySelector('.book-mark-link');
    // Scroll event
    window.addEventListener('scroll', () => link.classList.toggle('book-mark-link-fixed', window.scrollY === 0));
    // Register beforeunload event when the trigger is auto
    if (trigger === 'auto') {
      // Register beforeunload event
      window.addEventListener('beforeunload', doSaveScroll);
      window.addEventListener('pjax:send', doSaveScroll);
    }
    // Save the position by clicking the icon
    link.addEventListener('click', () => {
      doSaveScroll();
      window.anime({
        targets : link,
        duration: 200,
        easing  : 'linear',
        top     : -30,
        complete: () => {
          setTimeout(() => {
            link.style.top = '';
          }, 400);
        }
      });
    });
    scrollToMark();
    window.addEventListener('pjax:success', scrollToMark);
  };

  init(CONFIG.bookmark.save);
});

/* global CONFIG */

window.addEventListener('DOMContentLoaded', () => {
  // Popup Window
  let isfetched = false;
  let datas;
  let isXml = true;
  // Search DB path
  let searchPath = CONFIG.path;
  if (searchPath.length === 0) {
    searchPath = 'search.xml';
  } else if (/json$/i.test(searchPath)) {
    isXml = false;
  }
  const path = CONFIG.root + searchPath;
  const input = document.getElementById('search-input');
  const resultContent = document.getElementById('search-result');

  // Ref: https://github.com/ForbesLindesay/unescape-html
  const unescapeHtml = html => {
    return String(html)
      .replace(/&quot;/g, '"')
      .replace(/&#39;/g, '\'')
      .replace(/&#x3A;/g, ':')
      // Replace all the other &#x; chars
      .replace(/&#(\d+);/g, (m, p) => {
        return String.fromCharCode(p);
      })
      .replace(/&lt;/g, '<')
      .replace(/&gt;/g, '>')
      .replace(/&amp;/g, '&');
  };

  const getIndexByWord = (word, text, caseSensitive) => {
    let wordLen = word.length;
    if (wordLen === 0) return [];
    let startPosition = 0;
    let position = [];
    let index = [];
    if (!caseSensitive) {
      text = text.toLowerCase();
      word = word.toLowerCase();
    }
    while ((position = text.indexOf(word, startPosition)) > -1) {
      index.push({
        position: position,
        word    : word
      });
      startPosition = position + wordLen;
    }
    return index;
  };

  // Merge hits into slices
  const mergeIntoSlice = (start, end, index, searchText) => {
    let item = index[index.length - 1];
    let position = item.position;
    let word = item.word;
    let hits = [];
    let searchTextCountInSlice = 0;
    while (position + word.length <= end && index.length !== 0) {
      if (word === searchText) {
        searchTextCountInSlice++;
      }
      hits.push({
        position: position,
        length  : word.length
      });
      let wordEnd = position + word.length;

      // Move to next position of hit
      index.pop();
      while (index.length !== 0) {
        item = index[index.length - 1];
        position = item.position;
        word = item.word;
        if (wordEnd > position) {
          index.pop();
        } else {
          break;
        }
      }
    }
    return {
      hits           : hits,
      start          : start,
      end            : end,
      searchTextCount: searchTextCountInSlice
    };
  };

  // Highlight title and content
  const highlightKeyword = (text, slice) => {
    let result = '';
    let prevEnd = slice.start;
    slice.hits.forEach(hit => {
      result += text.substring(prevEnd, hit.position);
      let end = hit.position + hit.length;
      result += `<b class="search-keyword">${text.substring(hit.position, end)}</b>`;
      prevEnd = end;
    });
    result += text.substring(prevEnd, slice.end);
    return result;
  };

  const inputEventFunction = () => {
    let searchText = input.value.trim().toLowerCase();
    let keywords = searchText.split(/[-\s]+/);
    if (keywords.length > 1) {
      keywords.push(searchText);
    }
    let resultItems = [];
    if (searchText.length > 0) {
      // Perform local searching
      datas.forEach(data => {
        // Only match articles with not empty titles
        if (!data.title) return;
        let searchTextCount = 0;
        let title = data.title.trim();
        let titleInLowerCase = title.toLowerCase();
        let content = data.content ? data.content.trim().replace(/<[^>]+>/g, '') : '';
        if (CONFIG.localsearch.unescape) {
          content = unescapeHtml(content);
        }
        let contentInLowerCase = content.toLowerCase();
        let articleUrl = decodeURIComponent(data.url).replace(/\/{2,}/g, '/');
        let indexOfTitle = [];
        let indexOfContent = [];
        keywords.forEach(keyword => {
          indexOfTitle = indexOfTitle.concat(getIndexByWord(keyword, titleInLowerCase, false));
          indexOfContent = indexOfContent.concat(getIndexByWord(keyword, contentInLowerCase, false));
        });

        // Show search results
        if (indexOfTitle.length > 0 || indexOfContent.length > 0) {
          let hitCount = indexOfTitle.length + indexOfContent.length;
          // Sort index by position of keyword
          [indexOfTitle, indexOfContent].forEach(index => {
            index.sort((itemLeft, itemRight) => {
              if (itemRight.position !== itemLeft.position) {
                return itemRight.position - itemLeft.position;
              }
              return itemLeft.word.length - itemRight.word.length;
            });
          });

          let slicesOfTitle = [];
          if (indexOfTitle.length !== 0) {
            let tmp = mergeIntoSlice(0, title.length, indexOfTitle, searchText);
            searchTextCount += tmp.searchTextCountInSlice;
            slicesOfTitle.push(tmp);
          }

          let slicesOfContent = [];
          while (indexOfContent.length !== 0) {
            let item = indexOfContent[indexOfContent.length - 1];
            let position = item.position;
            let word = item.word;
            // Cut out 100 characters
            let start = position - 20;
            let end = position + 80;
            if (start < 0) {
              start = 0;
            }
            if (end < position + word.length) {
              end = position + word.length;
            }
            if (end > content.length) {
              end = content.length;
            }
            let tmp = mergeIntoSlice(start, end, indexOfContent, searchText);
            searchTextCount += tmp.searchTextCountInSlice;
            slicesOfContent.push(tmp);
          }

          // Sort slices in content by search text's count and hits' count
          slicesOfContent.sort((sliceLeft, sliceRight) => {
            if (sliceLeft.searchTextCount !== sliceRight.searchTextCount) {
              return sliceRight.searchTextCount - sliceLeft.searchTextCount;
            } else if (sliceLeft.hits.length !== sliceRight.hits.length) {
              return sliceRight.hits.length - sliceLeft.hits.length;
            }
            return sliceLeft.start - sliceRight.start;
          });

          // Select top N slices in content
          let upperBound = parseInt(CONFIG.localsearch.top_n_per_article, 10);
          if (upperBound >= 0) {
            slicesOfContent = slicesOfContent.slice(0, upperBound);
          }

          let resultItem = '';

          if (slicesOfTitle.length !== 0) {
            resultItem += `<li><a href="${articleUrl}" class="search-result-title">${highlightKeyword(title, slicesOfTitle[0])}</a>`;
          } else {
            resultItem += `<li><a href="${articleUrl}" class="search-result-title">${title}</a>`;
          }

          slicesOfContent.forEach(slice => {
            resultItem += `<a href="${articleUrl}"><p class="search-result">${highlightKeyword(content, slice)}...</p></a>`;
          });

          resultItem += '</li>';
          resultItems.push({
            item           : resultItem,
            searchTextCount: searchTextCount,
            hitCount       : hitCount,
            id             : resultItems.length
          });
        }
      });
    }
    if (keywords.length === 1 && keywords[0] === '') {
      resultContent.innerHTML = '<div id="no-result"><i class="fa fa-search fa-5x"></i></div>';
    } else if (resultItems.length === 0) {
      resultContent.innerHTML = '<div id="no-result"><i class="fa fa-frown-o fa-5x"></i></div>';
    } else {
      resultItems.sort((resultLeft, resultRight) => {
        if (resultLeft.searchTextCount !== resultRight.searchTextCount) {
          return resultRight.searchTextCount - resultLeft.searchTextCount;
        } else if (resultLeft.hitCount !== resultRight.hitCount) {
          return resultRight.hitCount - resultLeft.hitCount;
        }
        return resultRight.id - resultLeft.id;
      });
      let searchResultList = '<ul class="search-result-list">';
      resultItems.forEach(result => {
        searchResultList += result.item;
      });
      searchResultList += '</ul>';
      resultContent.innerHTML = searchResultList;
      window.pjax && window.pjax.refresh(resultContent);
    }
  };

  const fetchData = callback => {
    fetch(path)
      .then(response => response.text())
      .then(res => {
        // Get the contents from search data
        isfetched = true;
        datas = isXml ? [...new DOMParser().parseFromString(res, 'text/xml').querySelectorAll('entry')].map(element => {
          return {
            title  : element.querySelector('title').innerHTML,
            content: element.querySelector('content').innerHTML,
            url    : element.querySelector('url').innerHTML
          };
        }) : JSON.parse(res);

        // Remove loading animation
        document.querySelector('.search-pop-overlay').innerHTML = '';
        document.body.style.overflow = '';

        if (callback) {
          callback();
        }
      });
  };

  if (CONFIG.localsearch.preload) {
    fetchData();
  }

  const proceedSearch = () => {
    document.body.style.overflow = 'hidden';
    document.querySelector('.search-pop-overlay').style.display = 'block';
    document.querySelector('.popup').style.display = 'block';
    document.getElementById('search-input').focus();
  };

  // Search function
  const searchFunc = () => {
    document.querySelector('.search-pop-overlay').style.display = '';
    document.querySelector('.search-pop-overlay').innerHTML = '<div class="search-loading-icon"><i class="fa fa-spinner fa-pulse fa-5x fa-fw"></i></div>';
    fetchData(proceedSearch);
  };

  if (CONFIG.localsearch.trigger === 'auto') {
    input.addEventListener('input', inputEventFunction);
  } else {
    document.querySelector('.search-icon').addEventListener('click', inputEventFunction);
    input.addEventListener('keypress', event => {
      if (event.keyCode === 13) {
        inputEventFunction();
      }
    });
  }

  // Handle and trigger popup window
  document.querySelector('.popup-trigger').addEventListener('click', () => {
    if (isfetched === false) {
      searchFunc();
    } else {
      proceedSearch();
    }
  });

  // Monitor main search box
  const onPopupClose = () => {
    document.body.style.overflow = '';
    document.querySelector('.search-pop-overlay').style.display = 'none';
    document.querySelector('.popup').style.display = 'none';
  };

  document.querySelector('.search-pop-overlay').addEventListener('click', onPopupClose);
  document.querySelector('.popup-btn-close').addEventListener('click', onPopupClose);
  window.addEventListener('pjax:success', onPopupClose);
  window.addEventListener('keyup', event => {
    if (event.which === 27) {
      onPopupClose();
    }
  });
});

/* global NexT, CONFIG, Velocity */

if (window.$ && window.$.Velocity) window.Velocity = window.$.Velocity;

NexT.motion = {};

NexT.motion.integrator = {
  queue : [],
  cursor: -1,
  init  : function() {
    this.queue = [];
    this.cursor = -1;
    return this;
  },
  add: function(fn) {
    this.queue.push(fn);
    return this;
  },
  next: function() {
    this.cursor++;
    var fn = this.queue[this.cursor];
    typeof fn === 'function' && fn(NexT.motion.integrator);
  },
  bootstrap: function() {
    this.next();
  }
};

NexT.motion.middleWares = {
  logo: function(integrator) {
    var sequence = [];
    var brand = document.querySelector('.brand');
    var image = document.querySelector('.custom-logo-image');
    var title = document.querySelector('.site-title');
    var subtitle = document.querySelector('.site-subtitle');
    var logoLineTop = document.querySelector('.logo-line-before i');
    var logoLineBottom = document.querySelector('.logo-line-after i');

    brand && sequence.push({
      e: brand,
      p: {opacity: 1},
      o: {duration: 200}
    });

    function getMistLineSettings(element, translateX) {
      return {
        e: element,
        p: {translateX: translateX},
        o: {
          duration     : 500,
          sequenceQueue: false
        }
      };
    }

    function pushImageToSequence() {
      sequence.push({
        e: image,
        p: {opacity: 1, top: 0},
        o: {duration: 200}
      });
    }

    NexT.utils.isMist() && logoLineTop && logoLineBottom
    && sequence.push(
      getMistLineSettings(logoLineTop, '100%'),
      getMistLineSettings(logoLineBottom, '-100%')
    );

    NexT.utils.isMuse() && image && pushImageToSequence();

    title && sequence.push({
      e: title,
      p: {opacity: 1, top: 0},
      o: {duration: 200}
    });

    subtitle && sequence.push({
      e: subtitle,
      p: {opacity: 1, top: 0},
      o: {duration: 200}
    });

    (NexT.utils.isPisces() || NexT.utils.isGemini()) && image && pushImageToSequence();

    if (sequence.length > 0) {
      sequence[sequence.length - 1].o.complete = function() {
        integrator.next();
      };
      Velocity.RunSequence(sequence);
    } else {
      integrator.next();
    }

    if (CONFIG.motion.async) {
      integrator.next();
    }
  },

  menu: function(integrator) {

    Velocity(document.querySelectorAll('.menu-item'), 'transition.slideDownIn', {
      display : null,
      duration: 200,
      complete: function() {
        integrator.next();
      }
    });

    if (CONFIG.motion.async) {
      integrator.next();
    }
  },

  postList: function(integrator) {

    var postBlock = document.querySelectorAll('.post-block, .pagination, .comments');
    var postBlockTransition = CONFIG.motion.transition.post_block;
    var postHeader = document.querySelectorAll('.post-header');
    var postHeaderTransition = CONFIG.motion.transition.post_header;
    var postBody = document.querySelectorAll('.post-body');
    var postBodyTransition = CONFIG.motion.transition.post_body;
    var collHeader = document.querySelectorAll('.collection-header');
    var collHeaderTransition = CONFIG.motion.transition.coll_header;
    var hasPost = postBlock.length > 0;

    if (hasPost) {
      var postMotionOptions = window.postMotionOptions || {
        stagger : 100,
        drag    : true,
        complete: function() {
          integrator.next();
        }
      };

      if (CONFIG.motion.transition.post_block) {
        Velocity(postBlock, 'transition.' + postBlockTransition, postMotionOptions);
      }
      if (CONFIG.motion.transition.post_header) {
        Velocity(postHeader, 'transition.' + postHeaderTransition, postMotionOptions);
      }
      if (CONFIG.motion.transition.post_body) {
        Velocity(postBody, 'transition.' + postBodyTransition, postMotionOptions);
      }
      if (CONFIG.motion.transition.coll_header) {
        Velocity(collHeader, 'transition.' + collHeaderTransition, postMotionOptions);
      }
    }
    if (NexT.utils.isPisces() || NexT.utils.isGemini()) {
      integrator.next();
    }
  },

  sidebar: function(integrator) {
    NexT.utils.updateSidebarPosition();
    var sidebarAffix = document.querySelector('.sidebar-inner');
    var sidebarAffixTransition = CONFIG.motion.transition.sidebar;
    // Only for Pisces | Gemini.
    if (CONFIG.motion.transition.sidebar && (NexT.utils.isPisces() || NexT.utils.isGemini())) {
      Velocity(sidebarAffix, 'transition.' + sidebarAffixTransition, {
        display : null,
        duration: 200,
        complete: function() {
          // After motion complete need to remove transform from sidebar to let affix work on Pisces | Gemini.
          sidebarAffix.style.transform = 'initial';
        }
      });
    }
    integrator.next();
  }
};

/* global NexT, CONFIG, Velocity */

NexT.boot = {};

NexT.boot.registerEvents = function() {

  NexT.utils.registerScrollPercent();
  NexT.utils.registerCanIUseTag();

  // Mobile top menu bar.
  document.querySelector('.site-nav-toggle .toggle').addEventListener('click', () => {
    event.currentTarget.classList.toggle('toggle-close');
    var siteNav = document.querySelector('.site-nav');
    var animateAction = siteNav.classList.contains('site-nav-on') ? 'slideUp' : 'slideDown';

    if (typeof Velocity === 'function') {
      Velocity(siteNav, animateAction, {
        duration: 200,
        complete: function() {
          siteNav.classList.toggle('site-nav-on');
        }
      });
    } else {
      siteNav.classList.toggle('site-nav-on');
    }
  });

  var TAB_ANIMATE_DURATION = 200;
  document.querySelectorAll('.sidebar-nav li').forEach((element, index) => {
    element.addEventListener('click', event => {
      var item = event.currentTarget;
      var activeTabClassName = 'sidebar-nav-active';
      var activePanelClassName = 'sidebar-panel-active';
      if (item.classList.contains(activeTabClassName)) return;

      var targets = document.querySelectorAll('.sidebar-panel');
      var target = targets[index];
      var currentTarget = targets[1 - index];
      window.anime({
        targets : currentTarget,
        duration: TAB_ANIMATE_DURATION,
        easing  : 'linear',
        opacity : 0,
        complete: () => {
          // Prevent adding TOC to Overview if Overview was selected when close & open sidebar.
          currentTarget.classList.remove(activePanelClassName);
          target.style.opacity = 0;
          target.classList.add(activePanelClassName);
          window.anime({
            targets : target,
            duration: TAB_ANIMATE_DURATION,
            easing  : 'linear',
            opacity : 1
          });
        }
      });

      [...item.parentNode.children].forEach(element => {
        element.classList.remove(activeTabClassName);
      });
      item.classList.add(activeTabClassName);
    });
  });

  window.addEventListener('resize', NexT.utils.initSidebarDimension);

  window.addEventListener('hashchange', () => {
    var tHash = location.hash;
    if (tHash !== '' && !tHash.match(/%\S{2}/)) {
      var target = document.querySelector(`.tabs ul.nav-tabs li a[href="${tHash}"]`);
      target && target.click();
    }
  });
};

NexT.boot.refresh = function() {

  /**
   * Register JS handlers by condition option.
   * Need to add config option in Front-End at 'layout/_partials/head.swig' file.
   */
  CONFIG.fancybox && NexT.utils.wrapImageWithFancyBox();
  CONFIG.mediumzoom && window.mediumZoom('.post-body :not(a) > img, .post-body > img');
  CONFIG.lazyload && window.lozad('.post-body img').observe();
  CONFIG.pangu && window.pangu.spacingPage();

  CONFIG.exturl && NexT.utils.registerExtURL();
  CONFIG.copycode.enable && NexT.utils.registerCopyCode();
  NexT.utils.registerTabsTag();
  NexT.utils.registerActiveMenuItem();
  NexT.utils.registerSidebarTOC();
  NexT.utils.wrapTableWithBox();
  NexT.utils.registerVideoIframe();
};

NexT.boot.motion = function() {
  // Define Motion Sequence & Bootstrap Motion.
  if (CONFIG.motion.enable) {
    NexT.motion.integrator
      .add(NexT.motion.middleWares.logo)
      .add(NexT.motion.middleWares.menu)
      .add(NexT.motion.middleWares.postList)
      .add(NexT.motion.middleWares.sidebar)
      .bootstrap();
  } else {
    NexT.utils.updateSidebarPosition();
  }
};

window.addEventListener('DOMContentLoaded', () => {
  NexT.boot.registerEvents();
  NexT.boot.refresh();
  NexT.boot.motion();
});

/* global NexT, CONFIG */

HTMLElement.prototype.wrap = function(wrapper) {
  this.parentNode.insertBefore(wrapper, this);
  this.parentNode.removeChild(this);
  wrapper.appendChild(this);
};

NexT.utils = {

  /**
   * Wrap images with fancybox.
   */
  wrapImageWithFancyBox: function() {
    document.querySelectorAll('.post-body :not(a) > img, .post-body > img').forEach(element => {
      var $image = $(element);
      var imageLink = $image.attr('data-src') || $image.attr('src');
      var $imageWrapLink = $image.wrap(`<a class="fancybox fancybox.image" href="${imageLink}" itemscope itemtype="http://schema.org/ImageObject" itemprop="url"></a>`).parent('a');
      if ($image.is('.post-gallery img')) {
        $imageWrapLink.addClass('post-gallery-img');
        $imageWrapLink.attr('data-fancybox', 'gallery').attr('rel', 'gallery');
      } else if ($image.is('.group-picture img')) {
        $imageWrapLink.attr('data-fancybox', 'group').attr('rel', 'group');
      } else {
        $imageWrapLink.attr('data-fancybox', 'default').attr('rel', 'default');
      }

      var imageTitle = $image.attr('title') || $image.attr('alt');
      if (imageTitle) {
        $imageWrapLink.append(`<p class="image-caption">${imageTitle}</p>`);
        // Make sure img title tag will show correctly in fancybox
        $imageWrapLink.attr('title', imageTitle).attr('data-caption', imageTitle);
      }
    });

    $.fancybox.defaults.hash = false;
    $('.fancybox').fancybox({
      loop   : true,
      helpers: {
        overlay: {
          locked: false
        }
      }
    });
  },

  registerExtURL: function() {
    document.querySelectorAll('.exturl').forEach(element => {
      element.addEventListener('click', event => {
        var exturl = event.currentTarget.getAttribute('data-url');
        var decurl = decodeURIComponent(escape(window.atob(exturl)));
        window.open(decurl, '_blank', 'noopener');
        return false;
      });
    });
  },

  /**
   * One-click copy code support.
   */
  registerCopyCode: function() {
    document.querySelectorAll('figure.highlight').forEach(element => {
      const initButton = button => {
        if (CONFIG.copycode.style === 'mac') {
          button.innerHTML = '<i class="fa fa-clipboard"></i>';
        } else {
          button.innerText = CONFIG.translation.copy_button;
        }
      };
      const box = document.createElement('div');
      box.classList.add('highlight-wrap');
      element.wrap(box);
      element.parentNode.insertAdjacentHTML('beforeend', '<div class="copy-btn"></div>');
      var button = element.parentNode.querySelector('.copy-btn');
      button.addEventListener('click', event => {
        var target = event.currentTarget;
        var code = [...target.parentNode.querySelectorAll('.code .line')].map(line => {
          return line.innerText;
        }).join('\n');
        var ta = document.createElement('textarea');
        var yPosition = window.scrollY;
        ta.style.top = yPosition + 'px'; // Prevent page scrolling
        ta.style.position = 'absolute';
        ta.style.opacity = '0';
        ta.readOnly = true;
        ta.value = code;
        document.body.append(ta);
        const selection = document.getSelection();
        const selected = selection.rangeCount > 0 ? selection.getRangeAt(0) : false;
        ta.select();
        ta.setSelectionRange(0, code.length);
        ta.readOnly = false;
        var result = document.execCommand('copy');
        if (CONFIG.copycode.show_result) {
          target.innerText = result ? CONFIG.translation.copy_success : CONFIG.translation.copy_failure;
        }
        ta.blur(); // For iOS
        target.blur();
        if (selected) {
          selection.removeAllRanges();
          selection.addRange(selected);
        }
        document.body.removeChild(ta);
      });
      button.addEventListener('mouseleave', event => {
        setTimeout(() => {
          initButton(event.target);
        }, 300);
      });
      initButton(button);
    });
  },

  wrapTableWithBox: function() {
    document.querySelectorAll('table').forEach(element => {
      const box = document.createElement('div');
      box.className = 'table-container';
      element.wrap(box);
    });
  },

  registerVideoIframe: function() {
    document.querySelectorAll('iframe').forEach(element => {
      const supported = [
        'www.youtube.com',
        'player.vimeo.com',
        'player.youku.com',
        'player.bilibili.com',
        'www.tudou.com'
      ].some(host => element.src.includes(host));
      if (supported && !element.parentNode.matches('.video-container')) {
        const box = document.createElement('div');
        box.className = 'video-container';
        element.wrap(box);
        let width = Number(element.width);
        let height = Number(element.height);
        if (width && height) {
          element.parentNode.style.paddingTop = (height / width * 100) + '%';
        }
      }
    });
  },

  registerScrollPercent: function() {
    var THRESHOLD = 50;
    var backToTop = document.querySelector('.back-to-top');
    var readingProgressBar = document.querySelector('.reading-progress-bar');
    // For init back to top in sidebar if page was scrolled after page refresh.
    window.addEventListener('scroll', () => {
      var scrollPercent;
      if (backToTop || readingProgressBar) {
        var docHeight = document.querySelector('.container').offsetHeight;
        var winHeight = window.innerHeight;
        var contentVisibilityHeight = docHeight > winHeight ? docHeight - winHeight : document.body.scrollHeight - winHeight;
        var scrollPercentRounded = Math.round(100 * window.scrollY / contentVisibilityHeight);
        scrollPercent = Math.min(scrollPercentRounded, 100) + '%';
      }
      if (backToTop) {
        backToTop.classList.toggle('back-to-top-on', window.scrollY > THRESHOLD);
        backToTop.querySelector('span').innerText = scrollPercent;
      }
      if (readingProgressBar) {
        readingProgressBar.style.width = scrollPercent;
      }
    });

    backToTop && backToTop.addEventListener('click', () => {
      window.anime({
        targets  : [document.documentElement, document.body],
        duration : 500,
        easing   : 'linear',
        scrollTop: 0
      });
    });
  },

  /**
   * Tabs tag listener (without twitter bootstrap).
   */
  registerTabsTag: function() {
    // Binding `nav-tabs` & `tab-content` by real time permalink changing.
    document.querySelectorAll('.tabs ul.nav-tabs .tab').forEach(element => {
      element.addEventListener('click', event => {
        event.preventDefault();
        var target = event.currentTarget;
        // Prevent selected tab to select again.
        if (!target.classList.contains('active')) {
          // Add & Remove active class on `nav-tabs` & `tab-content`.
          [...target.parentNode.children].forEach(element => {
            element.classList.remove('active');
          });
          target.classList.add('active');
          var tActive = document.getElementById(target.querySelector('a').getAttribute('href').replace('#', ''));
          [...tActive.parentNode.children].forEach(element => {
            element.classList.remove('active');
          });
          tActive.classList.add('active');
          // Trigger event
          tActive.dispatchEvent(new Event('tabs:click', {
            bubbles: true
          }));
        }
      });
    });

    window.dispatchEvent(new Event('tabs:register'));
  },

  registerCanIUseTag: function() {
    // Get responsive height passed from iframe.
    window.addEventListener('message', event => {
      var data = event.data;
      if ((typeof data === 'string') && (data.indexOf('ciu_embed') > -1)) {
        var featureID = data.split(':')[1];
        var height = data.split(':')[2];
        document.querySelector(`iframe[data-feature=${featureID}]`).style.height = parseInt(height, 10) + 'px';
      }
    }, false);
  },

  registerActiveMenuItem: function() {
    document.querySelectorAll('.menu-item').forEach(element => {
      var target = element.querySelector('a[href]');
      if (!target) return;
      var isSamePath = target.pathname === location.pathname || target.pathname === location.pathname.replace('index.html', '');
      var isSubPath = target.pathname !== CONFIG.root && location.pathname.indexOf(target.pathname) === 0;
      element.classList.toggle('menu-item-active', target.hostname === location.hostname && (isSamePath || isSubPath));
    });
  },

  registerSidebarTOC: function() {
    const navItems = document.querySelectorAll('.post-toc li');
    const sections = [...navItems].map(element => {
      var link = element.querySelector('a.nav-link');
      // TOC item animation navigate.
      link.addEventListener('click', event => {
        event.preventDefault();
        var target = document.getElementById(event.currentTarget.getAttribute('href').replace('#', ''));
        var offset = target.getBoundingClientRect().top + window.scrollY;
        window.anime({
          targets  : [document.documentElement, document.body],
          duration : 500,
          easing   : 'linear',
          scrollTop: offset + 10
        });
      });
      return document.getElementById(link.getAttribute('href').replace('#', ''));
    });

    var tocElement = document.querySelector('.post-toc-wrap');
    function activateNavByIndex(target) {
      if (target.classList.contains('active-current')) return;

      document.querySelectorAll('.post-toc .active').forEach(element => {
        element.classList.remove('active', 'active-current');
      });
      target.classList.add('active', 'active-current');
      var parent = target.parentNode;
      while (!parent.matches('.post-toc')) {
        if (parent.matches('li')) parent.classList.add('active');
        parent = parent.parentNode;
      }
      // Scrolling to center active TOC element if TOC content is taller then viewport.
      window.anime({
        targets  : tocElement,
        duration : 200,
        easing   : 'linear',
        scrollTop: tocElement.scrollTop - (tocElement.offsetHeight / 2) + target.getBoundingClientRect().top - tocElement.getBoundingClientRect().top
      });
    }

    function findIndex(entries) {
      let index = 0;
      let entry = entries[index];
      if (entry.boundingClientRect.top > 0) {
        index = sections.indexOf(entry.target);
        return index === 0 ? 0 : index - 1;
      }
      for (; index < entries.length; index++) {
        if (entries[index].boundingClientRect.top <= 0) {
          entry = entries[index];
        } else {
          return sections.indexOf(entry.target);
        }
      }
      return sections.indexOf(entry.target);
    }

    function createIntersectionObserver(marginTop) {
      marginTop = Math.floor(marginTop + 10000);
      let intersectionObserver = new IntersectionObserver((entries, observe) => {
        let scrollHeight = document.documentElement.scrollHeight + 100;
        if (scrollHeight > marginTop) {
          observe.disconnect();
          createIntersectionObserver(scrollHeight);
          return;
        }
        let index = findIndex(entries);
        activateNavByIndex(navItems[index]);
      }, {
        rootMargin: marginTop + 'px 0px -100% 0px',
        threshold : 0
      });
      sections.forEach(element => {
        element && intersectionObserver.observe(element);
      });
    }
    createIntersectionObserver(document.documentElement.scrollHeight);
  },

  hasMobileUA: function() {
    var ua = navigator.userAgent;
    var pa = /iPad|iPhone|Android|Opera Mini|BlackBerry|webOS|UCWEB|Blazer|PSP|IEMobile|Symbian/g;

    return pa.test(ua);
  },

  isTablet: function() {
    return window.screen.width < 992 && window.screen.width > 767 && this.hasMobileUA();
  },

  isMobile: function() {
    return window.screen.width < 767 && this.hasMobileUA();
  },

  isDesktop: function() {
    return !this.isTablet() && !this.isMobile();
  },

  isMuse: function() {
    return CONFIG.scheme === 'Muse';
  },

  isMist: function() {
    return CONFIG.scheme === 'Mist';
  },

  isPisces: function() {
    return CONFIG.scheme === 'Pisces';
  },

  isGemini: function() {
    return CONFIG.scheme === 'Gemini';
  },

  /**
   * Init Sidebar & TOC inner dimensions on all pages and for all schemes.
   * Need for Sidebar/TOC inner scrolling if content taller then viewport.
   */
  initSidebarDimension: function() {
    var sidebarNav = document.querySelector('.sidebar-nav');
    var sidebarNavHeight = sidebarNav.style.display !== 'none' ? sidebarNav.offsetHeight : 0;
    var sidebarOffset = CONFIG.sidebar.offset || 12;
    var sidebarb2tHeight = CONFIG.back2top.enable && CONFIG.back2top.sidebar ? document.querySelector('.back-to-top').offsetHeight : 0;
    var sidebarSchemePadding = CONFIG.sidebarPadding + sidebarNavHeight + sidebarb2tHeight;
    // Margin of sidebar b2t: 8px -10px -20px, brings a different of 12px.
    if (NexT.utils.isPisces() || NexT.utils.isGemini()) sidebarSchemePadding += (sidebarOffset * 2) - 12;
    // Initialize Sidebar & TOC Height.
    var sidebarWrapperHeight = document.body.offsetHeight - sidebarSchemePadding + 'px';
    document.querySelector('.site-overview-wrap').style.maxHeight = sidebarWrapperHeight;
    document.querySelector('.post-toc-wrap').style.maxHeight = sidebarWrapperHeight;
  },

  updateSidebarPosition: function() {
    var sidebarNav = document.querySelector('.sidebar-nav');
    var hasTOC = document.querySelector('.post-toc');
    if (hasTOC) {
      sidebarNav.style.display = '';
      sidebarNav.classList.add('motion-element');
      document.querySelector('.sidebar-nav-toc').click();
    } else {
      sidebarNav.style.display = 'none';
      sidebarNav.classList.remove('motion-element');
      document.querySelector('.sidebar-nav-overview').click();
    }
    NexT.utils.initSidebarDimension();
    if (!this.isDesktop() || this.isPisces() || this.isGemini()) return;
    // Expand sidebar on post detail page by default, when post has a toc.
    var display = CONFIG.page.sidebar;
    if (typeof display !== 'boolean') {
      // There's no definition sidebar in the page front-matter.
      display = CONFIG.sidebar.display === 'always' || (CONFIG.sidebar.display === 'post' && hasTOC);
    }
    if (display) {
      window.dispatchEvent(new Event('sidebar:show'));
    }
  },

  getScript: function(url, callback, condition) {
    if (condition) {
      callback();
    } else {
      var script = document.createElement('script');
      script.onload = script.onreadystatechange = function(_, isAbort) {
        if (isAbort || !script.readyState || /loaded|complete/.test(script.readyState)) {
          script.onload = script.onreadystatechange = null;
          script = undefined;
          if (!isAbort && callback) setTimeout(callback, 0);
        }
      };
      script.src = url;
      document.head.appendChild(script);
    }
  }
};

/*
 * anime.js v3.1.0
 * (c) 2019 Julian Garnier
 * Released under the MIT license
 * animejs.com
 */

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/* global NexT, CONFIG, Velocity */

window.addEventListener('DOMContentLoaded', () => {

  var isRight = CONFIG.sidebar.position === 'right';
  var SIDEBAR_WIDTH = CONFIG.sidebar.width || 320;
  var SIDEBAR_DISPLAY_DURATION = 400;
  var mousePos = {}; var touchPos = {};

  var sidebarToggleLines = {
    lines: document.querySelector('.sidebar-toggle'),
    init : function() {
      this.lines.classList.remove('toggle-arrow', 'toggle-close');
    },
    arrow: function() {
      this.lines.classList.remove('toggle-close');
      this.lines.classList.add('toggle-arrow');
    },
    close: function() {
      this.lines.classList.remove('toggle-arrow');
      this.lines.classList.add('toggle-close');
    }
  };

  var sidebarToggleMotion = {
    sidebarEl       : document.querySelector('.sidebar'),
    isSidebarVisible: false,
    init            : function() {
      sidebarToggleLines.init();

      window.addEventListener('mousedown', this.mousedownHandler.bind(this));
      window.addEventListener('mouseup', this.mouseupHandler.bind(this));
      document.querySelector('#sidebar-dimmer').addEventListener('click', this.clickHandler.bind(this));
      document.querySelector('.sidebar-toggle').addEventListener('click', this.clickHandler.bind(this));
      document.querySelector('.sidebar-toggle').addEventListener('mouseenter', this.mouseEnterHandler.bind(this));
      document.querySelector('.sidebar-toggle').addEventListener('mouseleave', this.mouseLeaveHandler.bind(this));
      this.sidebarEl.addEventListener('touchstart', this.touchstartHandler.bind(this));
      this.sidebarEl.addEventListener('touchend', this.touchendHandler.bind(this));
      this.sidebarEl.addEventListener('touchmove', event => event.preventDefault());
      window.addEventListener('sidebar:show', this.showSidebar.bind(this));
      window.addEventListener('sidebar:hide', this.hideSidebar.bind(this));
    },
    mousedownHandler: function(event) {
      mousePos.X = event.pageX;
      mousePos.Y = event.pageY;
    },
    mouseupHandler: function(event) {
      var deltaX = event.pageX - mousePos.X;
      var deltaY = event.pageY - mousePos.Y;
      var clickingBlankPart = Math.sqrt((deltaX * deltaX) + (deltaY * deltaY)) < 20 && event.target.matches('.main');
      if (this.isSidebarVisible && (clickingBlankPart || event.target.matches('img.medium-zoom-image, .fancybox img'))) {
        this.hideSidebar();
      }
    },
    clickHandler: function() {
      this.isSidebarVisible ? this.hideSidebar() : this.showSidebar();
    },
    mouseEnterHandler: function() {
      if (!this.isSidebarVisible) {
        sidebarToggleLines.arrow();
      }
    },
    mouseLeaveHandler: function() {
      if (!this.isSidebarVisible) {
        sidebarToggleLines.init();
      }
    },
    touchstartHandler: function(event) {
      touchPos.X = event.touches[0].clientX;
      touchPos.Y = event.touches[0].clientY;
    },
    touchendHandler: function(event) {
      var deltaX = event.changedTouches[0].clientX - touchPos.X;
      var deltaY = event.changedTouches[0].clientY - touchPos.Y;
      var effectiveSliding = Math.abs(deltaY) < 20 && ((deltaX > 30 && isRight) || (deltaX < -30 && !isRight));
      if (this.isSidebarVisible && effectiveSliding) {
        this.hideSidebar();
      }
    },
    showSidebar: function() {
      this.isSidebarVisible = true;
      this.sidebarEl.classList.add('sidebar-active');
      if (typeof Velocity === 'function') {
        Velocity(document.querySelectorAll('.sidebar .motion-element'), isRight ? 'transition.slideRightIn' : 'transition.slideLeftIn', {
          stagger: 50,
          drag   : true
        });
      }

      sidebarToggleLines.close();
      NexT.utils.isDesktop() && window.anime(Object.assign({
        targets : document.body,
        duration: SIDEBAR_DISPLAY_DURATION,
        easing  : 'linear'
      }, isRight ? {
        'padding-right': SIDEBAR_WIDTH
      } : {
        'padding-left': SIDEBAR_WIDTH
      }));
    },
    hideSidebar: function() {
      this.isSidebarVisible = false;
      this.sidebarEl.classList.remove('sidebar-active');

      sidebarToggleLines.init();
      NexT.utils.isDesktop() && window.anime(Object.assign({
        targets : document.body,
        duration: SIDEBAR_DISPLAY_DURATION,
        easing  : 'linear'
      }, isRight ? {
        'padding-right': 0
      } : {
        'padding-left': 0
      }));
    }
  };
  sidebarToggleMotion.init();

  function updateFooterPosition() {
    var footer = document.querySelector('.footer');
    var containerHeight = document.querySelector('.header').offsetHeight + document.querySelector('.main').offsetHeight + footer.offsetHeight;
    footer.classList.toggle('footer-fixed', containerHeight <= window.innerHeight);
  }

  updateFooterPosition();
  window.addEventListener('resize', updateFooterPosition);
  window.addEventListener('scroll', updateFooterPosition);
});

/* global NexT, CONFIG */

var Affix = {
  init: function(element, options) {
    this.element = element;
    this.offset = options || 0;
    this.affixed = null;
    this.unpin = null;
    this.pinnedOffset = null;
    this.checkPosition();
    window.addEventListener('scroll', this.checkPosition.bind(this));
    window.addEventListener('click', this.checkPositionWithEventLoop.bind(this));
    window.matchMedia('(min-width: 992px)').addListener(event => {
      if (event.matches) {
        this.offset = NexT.utils.getAffixParam();
        this.checkPosition();
      }
    });
  },
  getState: function(scrollHeight, height, offsetTop, offsetBottom) {
    let scrollTop = window.scrollY;
    let targetHeight = window.innerHeight;
    if (offsetTop != null && this.affixed === 'top') return scrollTop < offsetTop ? 'top' : false;
    if (this.affixed === 'bottom') {
      if (offsetTop != null) return this.unpin <= this.element.getBoundingClientRect().top ? false : 'bottom';
      return scrollTop + targetHeight <= scrollHeight - offsetBottom ? false : 'bottom';
    }
    let initializing = this.affixed === null;
    let colliderTop = initializing ? scrollTop : this.element.getBoundingClientRect().top + scrollTop;
    let colliderHeight = initializing ? targetHeight : height;
    if (offsetTop != null && scrollTop <= offsetTop) return 'top';
    if (offsetBottom != null && (colliderTop + colliderHeight >= scrollHeight - offsetBottom)) return 'bottom';
    return false;
  },
  getPinnedOffset: function() {
    if (this.pinnedOffset) return this.pinnedOffset;
    this.element.classList.remove('affix-top', 'affix-bottom');
    this.element.classList.add('affix');
    return (this.pinnedOffset = this.element.getBoundingClientRect().top);
  },
  checkPositionWithEventLoop() {
    setTimeout(this.checkPosition.bind(this), 1);
  },
  checkPosition: function() {
    if (window.getComputedStyle(this.element).display === 'none') return;
    let height = this.element.offsetHeight - CONFIG.sidebarPadding;
    let offset = this.offset;
    let offsetTop = offset.top;
    let offsetBottom = offset.bottom;
    let scrollHeight = document.body.scrollHeight;
    let affix = this.getState(scrollHeight, height, offsetTop, offsetBottom);
    if (this.affixed !== affix) {
      if (this.unpin != null) this.element.style.top = '';
      let affixType = 'affix' + (affix ? '-' + affix : '');
      this.affixed = affix;
      this.unpin = affix === 'bottom' ? this.getPinnedOffset() : null;
      this.element.classList.remove('affix', 'affix-top', 'affix-bottom');
      this.element.classList.add(affixType);
    }
    if (affix === 'bottom') {
      this.element.style.top = scrollHeight - height - offsetBottom + 'px';
    }
  }
};

NexT.utils.getAffixParam = function() {
  const sidebarOffset = CONFIG.sidebar.offset || 12;

  let headerOffset = document.querySelector('.header-inner').offsetHeight + sidebarOffset;
  let footer = document.querySelector('.footer');
  let footerInner = document.querySelector('.footer-inner');
  let footerMargin = footer.offsetHeight - footerInner.offsetHeight;
  let footerOffset = footer.offsetHeight + footerMargin;

  document.querySelector('.sidebar').style.marginTop = headerOffset + 'px';

  return {
    top   : headerOffset - sidebarOffset,
    bottom: footerOffset
  };
};

window.addEventListener('DOMContentLoaded', () => {

  Affix.init(document.querySelector('.sidebar-inner'), NexT.utils.getAffixParam());
});

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