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/wp-admin/js/ -> editor.js (source)

   1  /**
   2   * @output wp-admin/js/editor.js
   3   */
   4  
   5  window.wp = window.wp || {};
   6  
   7  /**
   8   * The editor functionality.
   9   *
  10   * @param {JQueryStatic} $  The jQuery object.
  11   * @param {Object}       wp The WordPress global object.
  12   */
  13  ( function( $, wp ) {
  14      wp.editor = wp.editor || {};
  15  
  16      /**
  17       * Utility functions for the editor.
  18       *
  19       * @since 2.5.0
  20       * @return {Object} The editor utility functions.
  21       */
  22  	function SwitchEditors() {
  23          var tinymce, $$,
  24              exports = {};
  25  
  26          /**
  27           * Initializes the editor utility functions.
  28           */
  29  		function init() {
  30              if ( ! tinymce && window.tinymce ) {
  31                  tinymce = window.tinymce;
  32                  $$ = tinymce.$;
  33  
  34                  /**
  35                   * Handles onclick events for the Visual/Code tabs.
  36                   *
  37                   * @since 4.3.0
  38                   *
  39                   * @return {void}
  40                   */
  41                  $$( document ).on( 'click', function( event ) {
  42                      var id, mode,
  43                          target = $$( event.target );
  44  
  45                      if ( target.hasClass( 'wp-switch-editor' ) ) {
  46                          id = target.attr( 'data-wp-editor-id' );
  47                          mode = target.hasClass( 'switch-tmce' ) ? 'tmce' : 'html';
  48                          switchEditor( id, mode );
  49                      }
  50                  });
  51              }
  52          }
  53  
  54          /**
  55           * Returns the height of the editor toolbar(s) in px.
  56           *
  57           * @since 3.9.0
  58           *
  59           * @param {Object} editor The TinyMCE editor.
  60           * @return {number} If the height is between 10 and 200 return the height,
  61           * else return 30.
  62           */
  63  		function getToolbarHeight( editor ) {
  64              var node = $$( '.mce-toolbar-grp', editor.getContainer() )[0],
  65                  height = node && node.clientHeight;
  66  
  67              if ( height && height > 10 && height < 200 ) {
  68                  return parseInt( height, 10 );
  69              }
  70  
  71              return 30;
  72          }
  73  
  74          /**
  75           * Switches the editor between Visual and Code mode.
  76           *
  77           * @since 2.5.0
  78           *
  79           * @memberof switchEditors
  80           *
  81           * @param {string} id   The id of the editor you want to change the editor mode for. Default: `content`.
  82           * @param {string} mode The mode you want to switch to. Default: `toggle`.
  83           * @return {void}
  84           */
  85  		function switchEditor( id, mode ) {
  86              id = id || 'content';
  87              mode = mode || 'toggle';
  88  
  89              var editorHeight, toolbarHeight, iframe,
  90                  editor = tinymce.get( id ),
  91                  wrap = $$( '#wp-' + id + '-wrap' ),
  92                  htmlSwitch = wrap.find( '.switch-tmce' ),
  93                  tmceSwitch = wrap.find( '.switch-html' ),
  94                  $textarea = $$( '#' + id ),
  95                  textarea = $textarea[0];
  96  
  97              if ( 'toggle' === mode ) {
  98                  if ( editor && ! editor.isHidden() ) {
  99                      mode = 'html';
 100                  } else {
 101                      mode = 'tmce';
 102                  }
 103              }
 104  
 105              if ( 'tmce' === mode || 'tinymce' === mode ) {
 106                  // If the editor is visible we are already in `tinymce` mode.
 107                  if ( editor && ! editor.isHidden() ) {
 108                      return false;
 109                  }
 110  
 111                  // Insert closing tags for any open tags in QuickTags.
 112                  if ( typeof( window.QTags ) !== 'undefined' ) {
 113                      window.QTags.closeAllTags( id );
 114                  }
 115  
 116                  editorHeight = parseInt( textarea.style.height, 10 ) || 0;
 117  
 118                  addHTMLBookmarkInTextAreaContent( $textarea );
 119  
 120                  if ( editor ) {
 121                      editor.show();
 122  
 123                      // No point to resize the iframe in iOS.
 124                      if ( ! tinymce.Env.iOS && editorHeight ) {
 125                          toolbarHeight = getToolbarHeight( editor );
 126                          editorHeight = editorHeight - toolbarHeight + 14;
 127  
 128                          // Sane limit for the editor height.
 129                          if ( editorHeight > 50 && editorHeight < 5000 ) {
 130                              editor.theme.resizeTo( null, editorHeight );
 131                          }
 132                      }
 133  
 134                      focusHTMLBookmarkInVisualEditor( editor );
 135                  } else {
 136                      tinymce.init( window.tinyMCEPreInit.mceInit[ id ] );
 137                  }
 138  
 139                  wrap.removeClass( 'html-active' ).addClass( 'tmce-active' );
 140                  tmceSwitch.attr( 'aria-pressed', false );
 141                  htmlSwitch.attr( 'aria-pressed', true );
 142                  $textarea.attr( 'aria-hidden', true );
 143                  window.setUserSetting( 'editor', 'tinymce' );
 144  
 145              } else if ( 'html' === mode ) {
 146                  // If the editor is hidden (Quicktags is shown) we don't need to switch.
 147                  if ( editor && editor.isHidden() ) {
 148                      return false;
 149                  }
 150  
 151                  if ( editor ) {
 152                      // Don't resize the textarea in iOS.
 153                      // The iframe is forced to 100% height there, we shouldn't match it.
 154                      if ( ! tinymce.Env.iOS ) {
 155                          iframe = editor.iframeElement;
 156                          editorHeight = iframe ? parseInt( iframe.style.height, 10 ) : 0;
 157  
 158                          if ( editorHeight ) {
 159                              toolbarHeight = getToolbarHeight( editor );
 160                              editorHeight = editorHeight + toolbarHeight - 14;
 161  
 162                              // Sane limit for the textarea height.
 163                              if ( editorHeight > 50 && editorHeight < 5000 ) {
 164                                  textarea.style.height = editorHeight + 'px';
 165                              }
 166                          }
 167                      }
 168  
 169                      var selectionRange = null;
 170  
 171                      selectionRange = findBookmarkedPosition( editor );
 172  
 173                      editor.hide();
 174  
 175                      if ( selectionRange ) {
 176                          selectTextInTextArea( editor, selectionRange );
 177                      }
 178                  } else {
 179                      // There is probably a JS error on the page.
 180                      // The TinyMCE editor instance doesn't exist. Show the textarea.
 181                      $textarea.css({ 'display': '', 'visibility': '' });
 182                  }
 183  
 184                  wrap.removeClass( 'tmce-active' ).addClass( 'html-active' );
 185                  tmceSwitch.attr( 'aria-pressed', true );
 186                  htmlSwitch.attr( 'aria-pressed', false );
 187                  $textarea.attr( 'aria-hidden', false );
 188                  window.setUserSetting( 'editor', 'html' );
 189              }
 190          }
 191  
 192          /**
 193           * Checks if a cursor is inside an HTML tag or comment.
 194           *
 195           * In order to prevent breaking HTML tags when selecting text, the cursor
 196           * must be moved to either the start or end of the tag.
 197           *
 198           * This will prevent the selection marker to be inserted in the middle of an HTML tag.
 199           *
 200           * This function gives information whether the cursor is inside a tag or not, as well as
 201           * the tag type, if it is a closing tag and check if the HTML tag is inside a shortcode tag,
 202           * e.g. `[caption]<img.../>..`.
 203           *
 204           * @param {string} content        The test content where the cursor is.
 205           * @param {number} cursorPosition The cursor position inside the content.
 206           *
 207           * @return {(null|Object)} Null if cursor is not in a tag, Object if the cursor is inside a tag.
 208           */
 209  		function getContainingTagInfo( content, cursorPosition ) {
 210              var lastLtPos = content.lastIndexOf( '<', cursorPosition - 1 ),
 211                  lastGtPos = content.lastIndexOf( '>', cursorPosition );
 212  
 213              if ( lastLtPos > lastGtPos || content.substr( cursorPosition, 1 ) === '>' ) {
 214                  // Find what the tag is.
 215                  var tagContent = content.substr( lastLtPos ),
 216                      tagMatch = tagContent.match( /<\s*(\/)?(\w+|\!-{2}.*-{2})/ );
 217  
 218                  if ( ! tagMatch ) {
 219                      return null;
 220                  }
 221  
 222                  var tagType = tagMatch[2],
 223                      closingGt = tagContent.indexOf( '>' );
 224  
 225                  return {
 226                      ltPos: lastLtPos,
 227                      gtPos: lastLtPos + closingGt + 1, // Offset by one to get the position _after_ the character.
 228                      tagType: tagType,
 229                      isClosingTag: !! tagMatch[1]
 230                  };
 231              }
 232              return null;
 233          }
 234  
 235          /**
 236           * Checks if the cursor is inside a shortcode
 237           *
 238           * If the cursor is inside a shortcode wrapping tag, e.g. `[caption]` it's better to
 239           * move the selection marker to before or after the shortcode.
 240           *
 241           * For example `[caption]` rewrites/removes anything that's between the `[caption]` tag and the
 242           * `<img/>` tag inside.
 243           *
 244           * `[caption]<span>ThisIsGone</span><img .../>[caption]`
 245           *
 246           * Moving the selection to before or after the short code is better, since it allows to select
 247           * something, instead of just losing focus and going to the start of the content.
 248           *
 249           * @param {string} content        The text content to check against.
 250           * @param {number} cursorPosition The cursor position to check.
 251           *
 252           * @return {void|Object} Undefined if the cursor is not wrapped in a shortcode tag.
 253           *                       Information about the wrapping shortcode tag if it's wrapped in one.
 254           */
 255  		function getShortcodeWrapperInfo( content, cursorPosition ) {
 256              var contentShortcodes = getShortCodePositionsInText( content );
 257  
 258              for ( var i = 0; i < contentShortcodes.length; i++ ) {
 259                  var element = contentShortcodes[ i ];
 260  
 261                  if ( cursorPosition >= element.startIndex && cursorPosition <= element.endIndex ) {
 262                      return element;
 263                  }
 264              }
 265          }
 266  
 267          /**
 268           * Gets a list of unique shortcodes or shortcode-lookalikes in the content.
 269           *
 270           * @param {string} content The content we want to scan for shortcodes.
 271           * @return {string[]} An array of unique shortcodes found in the content.
 272           */
 273  		function getShortcodesInText( content ) {
 274              var shortcodes = content.match( /\[+([\w_-])+/g ),
 275                  result = [];
 276  
 277              if ( shortcodes ) {
 278                  for ( var i = 0; i < shortcodes.length; i++ ) {
 279                      var shortcode = shortcodes[ i ].replace( /^\[+/g, '' );
 280  
 281                      if ( result.indexOf( shortcode ) === -1 ) {
 282                          result.push( shortcode );
 283                      }
 284                  }
 285              }
 286  
 287              return result;
 288          }
 289  
 290          /**
 291           * Gets all shortcodes and their positions in the content
 292           *
 293           * This function returns all the shortcodes that could be found in the textarea content
 294           * along with their character positions and boundaries.
 295           *
 296           * This is used to check if the selection cursor is inside the boundaries of a shortcode
 297           * and move it accordingly, to avoid breakage.
 298           *
 299           * @link adjustTextAreaSelectionCursors
 300           *
 301           * The information can also be used in other cases when we need to lookup shortcode data,
 302           * as it's already structured!
 303           *
 304           * @param {string} content The content we want to scan for shortcodes.
 305           * @return {Object[]} An array of objects with information about the shortcodes found in the content.
 306           */
 307  		function getShortCodePositionsInText( content ) {
 308              var allShortcodes = getShortcodesInText( content ), shortcodeInfo;
 309  
 310              if ( allShortcodes.length === 0 ) {
 311                  return [];
 312              }
 313  
 314              var shortcodeDetailsRegexp = wp.shortcode.regexp( allShortcodes.join( '|' ) ),
 315                  shortcodeMatch, // Define local scope for the variable to be used in the loop below.
 316                  shortcodesDetails = [];
 317  
 318              while ( shortcodeMatch = shortcodeDetailsRegexp.exec( content ) ) {
 319                  /**
 320                   * Check if the shortcode should be shown as plain text.
 321                   *
 322                   * This corresponds to the [[shortcode]] syntax, which doesn't parse the shortcode
 323                   * and just shows it as text.
 324                   */
 325                  var showAsPlainText = shortcodeMatch[1] === '[';
 326  
 327                  shortcodeInfo = {
 328                      shortcodeName: shortcodeMatch[2],
 329                      showAsPlainText: showAsPlainText,
 330                      startIndex: shortcodeMatch.index,
 331                      endIndex: shortcodeMatch.index + shortcodeMatch[0].length,
 332                      length: shortcodeMatch[0].length
 333                  };
 334  
 335                  shortcodesDetails.push( shortcodeInfo );
 336              }
 337  
 338              /**
 339               * Get all URL matches, and treat them as embeds.
 340               *
 341               * Since there isn't a good way to detect if a URL by itself on a line is a previewable
 342               * object, it's best to treat all of them as such.
 343               *
 344               * This means that the selection will capture the whole URL, in a similar way shrotcodes
 345               * are treated.
 346               */
 347              var urlRegexp = new RegExp(
 348                  '(^|[\\n\\r][\\n\\r]|<p>)(https?:\\/\\/[^\s"]+?)(<\\/p>\s*|[\\n\\r][\\n\\r]|$)', 'gi'
 349              );
 350  
 351              while ( shortcodeMatch = urlRegexp.exec( content ) ) {
 352                  shortcodeInfo = {
 353                      shortcodeName: 'url',
 354                      showAsPlainText: false,
 355                      startIndex: shortcodeMatch.index,
 356                      endIndex: shortcodeMatch.index + shortcodeMatch[ 0 ].length,
 357                      length: shortcodeMatch[ 0 ].length,
 358                      urlAtStartOfContent: shortcodeMatch[ 1 ] === '',
 359                      urlAtEndOfContent: shortcodeMatch[ 3 ] === ''
 360                  };
 361  
 362                  shortcodesDetails.push( shortcodeInfo );
 363              }
 364  
 365              return shortcodesDetails;
 366          }
 367  
 368          /**
 369           * Generate a cursor marker element to be inserted in the content.
 370           *
 371           * `span` seems to be the least destructive element that can be used.
 372           *
 373           * Using DomQuery syntax to create it, since it's used as both text and as a DOM element.
 374           *
 375           * @param {Object} domLib  DOM library instance.
 376           * @param {string} content The content to insert into the cursor marker element.
 377           * @return {Object} The cursor marker element.
 378           */
 379  		function getCursorMarkerSpan( domLib, content ) {
 380              return domLib( '<span>' ).css( {
 381                          display: 'inline-block',
 382                          width: 0,
 383                          overflow: 'hidden',
 384                          'line-height': 0
 385                      } )
 386                      .html( content ? content : '' );
 387          }
 388  
 389          /**
 390           * Gets adjusted selection cursor positions according to HTML tags, comments, and shortcodes.
 391           *
 392           * Shortcodes and HTML codes are a bit of a special case when selecting, since they may render
 393           * content in Visual mode. If we insert selection markers somewhere inside them, it's really possible
 394           * to break the syntax and render the HTML tag or shortcode broken.
 395           *
 396           * @link getShortcodeWrapperInfo
 397           *
 398           * @param {string}                                   content         Textarea content that the cursors are in
 399           * @param {{cursorStart: number, cursorEnd: number}} cursorPositions Cursor start and end positions
 400           *
 401           * @return {{cursorStart: number, cursorEnd: number}} Adjusted cursor positions with `cursorStart` and `cursorEnd` properties.
 402           */
 403  		function adjustTextAreaSelectionCursors( content, cursorPositions ) {
 404              var voidElements = [
 405                  'area', 'base', 'br', 'col', 'embed', 'hr', 'img', 'input',
 406                  'keygen', 'link', 'meta', 'param', 'source', 'track', 'wbr'
 407              ];
 408  
 409              var cursorStart = cursorPositions.cursorStart,
 410                  cursorEnd = cursorPositions.cursorEnd,
 411                  // Check if the cursor is in a tag and if so, adjust it.
 412                  isCursorStartInTag = getContainingTagInfo( content, cursorStart );
 413  
 414              if ( isCursorStartInTag ) {
 415                  /**
 416                   * Only move to the start of the HTML tag (to select the whole element) if the tag
 417                   * is part of the voidElements list above.
 418                   *
 419                   * This list includes tags that are self-contained and don't need a closing tag, according to the
 420                   * HTML5 specification.
 421                   *
 422                   * This is done in order to make selection of text a bit more consistent when selecting text in
 423                   * `<p>` tags or such.
 424                   *
 425                   * In cases where the tag is not a void element, the cursor is put to the end of the tag,
 426                   * so it's either between the opening and closing tag elements or after the closing tag.
 427                   */
 428                  if ( voidElements.indexOf( isCursorStartInTag.tagType ) !== -1 ) {
 429                      cursorStart = isCursorStartInTag.ltPos;
 430                  } else {
 431                      cursorStart = isCursorStartInTag.gtPos;
 432                  }
 433              }
 434  
 435              var isCursorEndInTag = getContainingTagInfo( content, cursorEnd );
 436              if ( isCursorEndInTag ) {
 437                  cursorEnd = isCursorEndInTag.gtPos;
 438              }
 439  
 440              var isCursorStartInShortcode = getShortcodeWrapperInfo( content, cursorStart );
 441              if ( isCursorStartInShortcode && ! isCursorStartInShortcode.showAsPlainText ) {
 442                  /**
 443                   * If a URL is at the start or the end of the content,
 444                   * the selection doesn't work, because it inserts a marker in the text,
 445                   * which breaks the embedURL detection.
 446                   *
 447                   * The best way to avoid that and not modify the user content is to
 448                   * adjust the cursor to either after or before URL.
 449                   */
 450                  if ( isCursorStartInShortcode.urlAtStartOfContent ) {
 451                      cursorStart = isCursorStartInShortcode.endIndex;
 452                  } else {
 453                      cursorStart = isCursorStartInShortcode.startIndex;
 454                  }
 455              }
 456  
 457              var isCursorEndInShortcode = getShortcodeWrapperInfo( content, cursorEnd );
 458              if ( isCursorEndInShortcode && ! isCursorEndInShortcode.showAsPlainText ) {
 459                  if ( isCursorEndInShortcode.urlAtEndOfContent ) {
 460                      cursorEnd = isCursorEndInShortcode.startIndex;
 461                  } else {
 462                      cursorEnd = isCursorEndInShortcode.endIndex;
 463                  }
 464              }
 465  
 466              return {
 467                  cursorStart: cursorStart,
 468                  cursorEnd: cursorEnd
 469              };
 470          }
 471  
 472          /**
 473           * Adds text selection markers in the editor textarea.
 474           *
 475           * Adds selection markers in the content of the editor `textarea`.
 476           * The method directly manipulates the `textarea` content, to allow TinyMCE plugins
 477           * to run after the markers are added.
 478           *
 479           * @param {Object} $textarea TinyMCE's textarea wrapped as a DomQuery object
 480           */
 481  		function addHTMLBookmarkInTextAreaContent( $textarea ) {
 482              if ( ! $textarea || ! $textarea.length ) {
 483                  // If no valid $textarea object is provided, there's nothing we can do.
 484                  return;
 485              }
 486  
 487              var textArea = $textarea[0],
 488                  textAreaContent = textArea.value,
 489  
 490                  adjustedCursorPositions = adjustTextAreaSelectionCursors( textAreaContent, {
 491                      cursorStart: textArea.selectionStart,
 492                      cursorEnd: textArea.selectionEnd
 493                  } ),
 494  
 495                  htmlModeCursorStartPosition = adjustedCursorPositions.cursorStart,
 496                  htmlModeCursorEndPosition = adjustedCursorPositions.cursorEnd,
 497  
 498                  mode = htmlModeCursorStartPosition !== htmlModeCursorEndPosition ? 'range' : 'single',
 499  
 500                  selectedText = null,
 501                  cursorMarkerSkeleton = getCursorMarkerSpan( $$, '&#65279;' ).attr( 'data-mce-type','bookmark' );
 502  
 503              if ( mode === 'range' ) {
 504                  var markedText = textArea.value.slice( htmlModeCursorStartPosition, htmlModeCursorEndPosition ),
 505                      bookMarkEnd = cursorMarkerSkeleton.clone().addClass( 'mce_SELRES_end' );
 506  
 507                  selectedText = [
 508                      markedText,
 509                      bookMarkEnd[0].outerHTML
 510                  ].join( '' );
 511              }
 512  
 513              textArea.value = [
 514                  textArea.value.slice( 0, htmlModeCursorStartPosition ), // Text until the cursor/selection position.
 515                  cursorMarkerSkeleton.clone()                            // Cursor/selection start marker.
 516                      .addClass( 'mce_SELRES_start' )[0].outerHTML,
 517                  selectedText,                                             // Selected text with end cursor/position marker.
 518                  textArea.value.slice( htmlModeCursorEndPosition )        // Text from last cursor/selection position to end.
 519              ].join( '' );
 520          }
 521  
 522          /**
 523           * Focuses the selection markers in Visual mode.
 524           *
 525           * The method checks for existing selection markers inside the editor DOM (Visual mode)
 526           * and create a selection between the two nodes using the DOM `createRange` selection API.
 527           *
 528           * If there is only a single node, select only the single node through TinyMCE's selection API
 529           *
 530           * @param {Object} editor TinyMCE editor instance.
 531           */
 532  		function focusHTMLBookmarkInVisualEditor( editor ) {
 533              var startNode = editor.$( '.mce_SELRES_start' ).attr( 'data-mce-bogus', 1 ),
 534                  endNode = editor.$( '.mce_SELRES_end' ).attr( 'data-mce-bogus', 1 );
 535  
 536              if ( startNode.length ) {
 537                  editor.focus();
 538  
 539                  if ( ! endNode.length ) {
 540                      editor.selection.select( startNode[0] );
 541                  } else {
 542                      var selection = editor.getDoc().createRange();
 543  
 544                      selection.setStartAfter( startNode[0] );
 545                      selection.setEndBefore( endNode[0] );
 546  
 547                      editor.selection.setRng( selection );
 548                  }
 549              }
 550  
 551              scrollVisualModeToStartElement( editor, startNode );
 552  
 553              removeSelectionMarker( startNode );
 554              removeSelectionMarker( endNode );
 555  
 556              editor.save();
 557          }
 558  
 559          /**
 560           * Removes selection marker and the parent node if it is an empty paragraph.
 561           *
 562           * By default TinyMCE wraps loose inline tags in a `<p>`.
 563           * When removing selection markers an empty `<p>` may be left behind, remove it.
 564           *
 565           * @param {Object} $marker The marker to be removed from the editor DOM, wrapped in an instance of `editor.$`
 566           */
 567  		function removeSelectionMarker( $marker ) {
 568              var $markerParent = $marker.parent();
 569  
 570              $marker.remove();
 571  
 572              //Remove empty paragraph left over after removing the marker.
 573              if ( $markerParent.is( 'p' ) && ! $markerParent.children().length && ! $markerParent.text() ) {
 574                  $markerParent.remove();
 575              }
 576          }
 577  
 578          /**
 579           * Scrolls the content to place the selected element in the center of the screen.
 580           *
 581           * Takes an element, that is usually the selection start element, selected in
 582           * `focusHTMLBookmarkInVisualEditor()` and scrolls the screen so the element appears roughly
 583           * in the middle of the screen.
 584           *
 585           * I order to achieve the proper positioning, the editor media bar and toolbar are subtracted
 586           * from the window height, to get the proper viewport window, that the user sees.
 587           *
 588           * @param {Object} editor  TinyMCE editor instance.
 589           * @param {Object} element HTMLElement that should be scrolled into view.
 590           */
 591  		function scrollVisualModeToStartElement( editor, element ) {
 592              var elementTop = editor.$( element ).offset().top,
 593                  TinyMCEContentAreaTop = editor.$( editor.getContentAreaContainer() ).offset().top,
 594  
 595                  toolbarHeight = getToolbarHeight( editor ),
 596  
 597                  edTools = $( '#wp-content-editor-tools' ),
 598                  edToolsHeight = 0,
 599                  edToolsOffsetTop = 0,
 600  
 601                  $scrollArea;
 602  
 603              if ( edTools.length ) {
 604                  edToolsHeight = edTools.height();
 605                  edToolsOffsetTop = edTools.offset().top;
 606              }
 607  
 608              var windowHeight = window.innerHeight || document.documentElement.clientHeight || document.body.clientHeight,
 609  
 610                  selectionPosition = TinyMCEContentAreaTop + elementTop,
 611                  visibleAreaHeight = windowHeight - ( edToolsHeight + toolbarHeight );
 612  
 613              // There's no need to scroll if the selection is inside the visible area.
 614              if ( selectionPosition < visibleAreaHeight ) {
 615                  return;
 616              }
 617  
 618              /**
 619               * The minimum scroll height should be to the top of the editor, to offer a consistent
 620               * experience.
 621               *
 622               * In order to find the top of the editor, we calculate the offset of `#wp-content-editor-tools` and
 623               * subtracting the height. This gives the scroll position where the top of the editor tools aligns with
 624               * the top of the viewport (under the Master Bar)
 625               */
 626              var adjustedScroll;
 627              if ( editor.settings.wp_autoresize_on ) {
 628                  $scrollArea = $( 'html,body' );
 629                  adjustedScroll = Math.max( selectionPosition - visibleAreaHeight / 2, edToolsOffsetTop - edToolsHeight );
 630              } else {
 631                  $scrollArea = $( editor.contentDocument ).find( 'html,body' );
 632                  adjustedScroll = elementTop;
 633              }
 634  
 635              $scrollArea.animate( {
 636                  scrollTop: parseInt( adjustedScroll, 10 )
 637              }, 100 );
 638          }
 639  
 640          /**
 641           * This method was extracted from the `SaveContent` hook in
 642           * `wp-includes/js/tinymce/plugins/wordpress/plugin.js`.
 643           *
 644           * It's needed here, since the method changes the content a bit, which confuses the cursor position.
 645           *
 646           * @param {Object} event TinyMCE event object.
 647           */
 648  		function fixTextAreaContent( event ) {
 649              // Keep empty paragraphs :(
 650              event.content = event.content.replace( /<p>(?:<br ?\/?>|\u00a0|\uFEFF| )*<\/p>/g, '<p>&nbsp;</p>' );
 651          }
 652  
 653          /**
 654           * Finds the current selection position in the Visual editor.
 655           *
 656           * Find the current selection in the Visual editor by inserting marker elements at the start
 657           * and end of the selection.
 658           *
 659           * Uses the standard DOM selection API to achieve that goal.
 660           *
 661           * Check the notes in the comments in the code below for more information on some gotchas
 662           * and why this solution was chosen.
 663           *
 664           * @param {Object} editor The editor where we must find the selection.
 665           * @return {void|Object} The selection range position in the editor.
 666           */
 667  		function findBookmarkedPosition( editor ) {
 668              // Get the TinyMCE `window` reference, since we need to access the raw selection.
 669              var TinyMCEWindow = editor.getWin(),
 670                  selection = TinyMCEWindow.getSelection();
 671  
 672              if ( ! selection || selection.rangeCount < 1 ) {
 673                  // no selection, no need to continue.
 674                  return;
 675              }
 676  
 677              /**
 678               * The ID is used to avoid replacing user generated content, that may coincide with the
 679               * format specified below.
 680               * @type {string}
 681               */
 682              var selectionID = 'SELRES_' + Math.random();
 683  
 684              /**
 685               * Create two marker elements that will be used to mark the start and the end of the range.
 686               *
 687               * The elements have hardcoded style that makes them invisible. This is done to avoid seeing
 688               * random content flickering in the editor when switching between modes.
 689               */
 690              var spanSkeleton = getCursorMarkerSpan( editor.$, selectionID ),
 691                  startElement = spanSkeleton.clone().addClass( 'mce_SELRES_start' ),
 692                  endElement = spanSkeleton.clone().addClass( 'mce_SELRES_end' );
 693  
 694              /**
 695               * Inspired by:
 696               * @link https://stackoverflow.com/a/17497803/153310
 697               *
 698               * Why do it this way and not with TinyMCE's bookmarks?
 699               *
 700               * TinyMCE's bookmarks are very nice when working with selections and positions, BUT
 701               * there is no way to determine the precise position of the bookmark when switching modes, since
 702               * TinyMCE does some serialization of the content, to fix things like shortcodes, run plugins, prettify
 703               * HTML code and so on. In this process, the bookmark markup gets lost.
 704               *
 705               * If we decide to hook right after the bookmark is added, we can see where the bookmark is in the raw HTML
 706               * in TinyMCE. Unfortunately this state is before the serialization, so any visual markup in the content will
 707               * throw off the positioning.
 708               *
 709               * To avoid this, we insert two custom `span`s that will serve as the markers at the beginning and end of the
 710               * selection.
 711               *
 712               * Why not use TinyMCE's selection API or the DOM API to wrap the contents? Because if we do that, this creates
 713               * a new node, which is inserted in the dom. Now this will be fine, if we worked with fixed selections to
 714               * full nodes. Unfortunately in our case, the user can select whatever they like, which means that the
 715               * selection may start in the middle of one node and end in the middle of a completely different one. If we
 716               * wrap the selection in another node, this will create artifacts in the content.
 717               *
 718               * Using the method below, we insert the custom `span` nodes at the start and at the end of the selection.
 719               * This helps us not break the content and also gives us the option to work with multi-node selections without
 720               * breaking the markup.
 721               */
 722              var range = selection.getRangeAt( 0 ),
 723                  startNode = range.startContainer,
 724                  startOffset = range.startOffset,
 725                  boundaryRange = range.cloneRange();
 726  
 727              /**
 728               * If the selection is on a shortcode with Live View, TinyMCE creates a bogus markup,
 729               * which we have to account for.
 730               */
 731              if ( editor.$( startNode ).parents( '.mce-offscreen-selection' ).length > 0 ) {
 732                  startNode = editor.$( '[data-mce-selected]' )[0];
 733  
 734                  /**
 735                   * Marking the start and end element with `data-mce-object-selection` helps
 736                   * discern when the selected object is a Live Preview selection.
 737                   *
 738                   * This way we can adjust the selection to properly select only the content, ignoring
 739                   * whitespace inserted around the selected object by the Editor.
 740                   */
 741                  startElement.attr( 'data-mce-object-selection', 'true' );
 742                  endElement.attr( 'data-mce-object-selection', 'true' );
 743  
 744                  editor.$( startNode ).before( startElement[0] );
 745                  editor.$( startNode ).after( endElement[0] );
 746              } else {
 747                  boundaryRange.collapse( false );
 748                  boundaryRange.insertNode( endElement[0] );
 749  
 750                  boundaryRange.setStart( startNode, startOffset );
 751                  boundaryRange.collapse( true );
 752                  boundaryRange.insertNode( startElement[0] );
 753  
 754                  range.setStartAfter( startElement[0] );
 755                  range.setEndBefore( endElement[0] );
 756                  selection.removeAllRanges();
 757                  selection.addRange( range );
 758              }
 759  
 760              /**
 761               * Now the editor's content has the start/end nodes.
 762               *
 763               * Unfortunately the content goes through some more changes after this step, before it gets inserted
 764               * in the `textarea`. This means that we have to do some minor cleanup on our own here.
 765               */
 766              editor.on( 'GetContent', fixTextAreaContent );
 767  
 768              var content = removep( editor.getContent() );
 769  
 770              editor.off( 'GetContent', fixTextAreaContent );
 771  
 772              startElement.remove();
 773              endElement.remove();
 774  
 775              var startRegex = new RegExp(
 776                  '<span[^>]*\\s*class="mce_SELRES_start"[^>]+>\\s*' + selectionID + '[^<]*<\\/span>(\\s*)'
 777              );
 778  
 779              var endRegex = new RegExp(
 780                  '(\\s*)<span[^>]*\\s*class="mce_SELRES_end"[^>]+>\\s*' + selectionID + '[^<]*<\\/span>'
 781              );
 782  
 783              var startMatch = content.match( startRegex ),
 784                  endMatch = content.match( endRegex );
 785  
 786              if ( ! startMatch ) {
 787                  return null;
 788              }
 789  
 790              var startIndex = startMatch.index,
 791                  startMatchLength = startMatch[0].length,
 792                  endIndex = null;
 793  
 794              if (endMatch) {
 795                  /**
 796                   * Adjust the selection index, if the selection contains a Live Preview object or not.
 797                   *
 798                   * Check where the `data-mce-object-selection` attribute is set above for more context.
 799                   */
 800                  if ( startMatch[0].indexOf( 'data-mce-object-selection' ) !== -1 ) {
 801                      startMatchLength -= startMatch[1].length;
 802                  }
 803  
 804                  var endMatchIndex = endMatch.index;
 805  
 806                  if ( endMatch[0].indexOf( 'data-mce-object-selection' ) !== -1 ) {
 807                      endMatchIndex -= endMatch[1].length;
 808                  }
 809  
 810                  // We need to adjust the end position to discard the length of the range start marker.
 811                  endIndex = endMatchIndex - startMatchLength;
 812              }
 813  
 814              return {
 815                  start: startIndex,
 816                  end: endIndex
 817              };
 818          }
 819  
 820          /**
 821           * Selects text in the TinyMCE `textarea`.
 822           *
 823           * Selects the text in TinyMCE's textarea that's between `selection.start` and `selection.end`.
 824           *
 825           * For `selection` parameter:
 826           * @link findBookmarkedPosition
 827           *
 828           * @param {Object} editor    TinyMCE's editor instance.
 829           * @param {Object} selection Selection data.
 830           */
 831  		function selectTextInTextArea( editor, selection ) {
 832              // Only valid in the text area mode and if we have selection.
 833              if ( ! selection ) {
 834                  return;
 835              }
 836  
 837              var textArea = editor.getElement(),
 838                  start = selection.start,
 839                  end = selection.end || selection.start;
 840  
 841              if ( textArea.focus ) {
 842                  // Wait for the Visual editor to be hidden, then focus and scroll to the position.
 843                  setTimeout( function() {
 844                      textArea.setSelectionRange( start, end );
 845                      if ( textArea.blur ) {
 846                          // Defocus before focusing.
 847                          textArea.blur();
 848                      }
 849                      textArea.focus();
 850                  }, 100 );
 851              }
 852          }
 853  
 854          // Restore the selection when the editor is initialized. Needed when the Code editor is the default.
 855          $( document ).on( 'tinymce-editor-init.keep-scroll-position', function( event, editor ) {
 856              if ( editor.$( '.mce_SELRES_start' ).length ) {
 857                  focusHTMLBookmarkInVisualEditor( editor );
 858              }
 859          } );
 860  
 861          /**
 862           * Replaces <p> tags with two line breaks. "Opposite" of wpautop().
 863           *
 864           * Replaces <p> tags with two line breaks except where the <p> has attributes.
 865           * Unifies whitespace.
 866           * Indents <li>, <dt> and <dd> for better readability.
 867           *
 868           * @since 2.5.0
 869           *
 870           * @memberof switchEditors
 871           *
 872           * @param {string} html The content from the editor.
 873           * @return {string} The content with stripped paragraph tags.
 874           */
 875  		function removep( html ) {
 876              var blocklist = 'blockquote|ul|ol|li|dl|dt|dd|table|thead|tbody|tfoot|tr|th|td|h[1-6]|fieldset|figure',
 877                  blocklist1 = blocklist + '|div|p',
 878                  blocklist2 = blocklist + '|pre',
 879                  preserve_linebreaks = false,
 880                  preserve_br = false,
 881                  preserve = [];
 882  
 883              if ( ! html ) {
 884                  return '';
 885              }
 886  
 887              // Protect script and style tags.
 888              if ( html.indexOf( '<script' ) !== -1 || html.indexOf( '<style' ) !== -1 ) {
 889                  html = html.replace( /<(script|style)[^>]*>[\s\S]*?<\/\1>/g, function( match ) {
 890                      preserve.push( match );
 891                      return '<wp-preserve>';
 892                  } );
 893              }
 894  
 895              // Protect pre tags.
 896              if ( html.indexOf( '<pre' ) !== -1 ) {
 897                  preserve_linebreaks = true;
 898                  html = html.replace( /<pre[^>]*>[\s\S]+?<\/pre>/g, function( a ) {
 899                      a = a.replace( /<br ?\/?>(\r\n|\n)?/g, '<wp-line-break>' );
 900                      a = a.replace( /<\/?p( [^>]*)?>(\r\n|\n)?/g, '<wp-line-break>' );
 901                      return a.replace( /\r?\n/g, '<wp-line-break>' );
 902                  });
 903              }
 904  
 905              // Remove line breaks but keep <br> tags inside image captions.
 906              if ( html.indexOf( '[caption' ) !== -1 ) {
 907                  preserve_br = true;
 908                  html = html.replace( /\[caption[\s\S]+?\[\/caption\]/g, function( a ) {
 909                      return a.replace( /<br([^>]*)>/g, '<wp-temp-br$1>' ).replace( /[\r\n\t]+/, '' );
 910                  });
 911              }
 912  
 913              // Normalize white space characters before and after block tags.
 914              html = html.replace( new RegExp( '\\s*</(' + blocklist1 + ')>\\s*', 'g' ), '</$1>\n' );
 915              html = html.replace( new RegExp( '\\s*<((?:' + blocklist1 + ')(?: [^>]*)?)>', 'g' ), '\n<$1>' );
 916  
 917              // Mark </p> if it has any attributes.
 918              html = html.replace( /(<p [^>]+>.*?)<\/p>/g, '$1</p#>' );
 919  
 920              // Preserve the first <p> inside a <div>.
 921              html = html.replace( /<div( [^>]*)?>\s*<p>/gi, '<div$1>\n\n' );
 922  
 923              // Remove paragraph tags.
 924              html = html.replace( /\s*<p>/gi, '' );
 925              html = html.replace( /\s*<\/p>\s*/gi, '\n\n' );
 926  
 927              // Normalize white space chars and remove multiple line breaks.
 928              html = html.replace( /\n[\s\u00a0]+\n/g, '\n\n' );
 929  
 930              // Replace <br> tags with line breaks.
 931              html = html.replace( /(\s*)<br ?\/?>\s*/gi, function( match, space ) {
 932                  if ( space && space.indexOf( '\n' ) !== -1 ) {
 933                      return '\n\n';
 934                  }
 935  
 936                  return '\n';
 937              });
 938  
 939              // Fix line breaks around <div>.
 940              html = html.replace( /\s*<div/g, '\n<div' );
 941              html = html.replace( /<\/div>\s*/g, '</div>\n' );
 942  
 943              // Fix line breaks around caption shortcodes.
 944              html = html.replace( /\s*\[caption([^\[]+)\[\/caption\]\s*/gi, '\n\n[caption$1[/caption]\n\n' );
 945              html = html.replace( /caption\]\n\n+\[caption/g, 'caption]\n\n[caption' );
 946  
 947              // Pad block elements tags with a line break.
 948              html = html.replace( new RegExp('\\s*<((?:' + blocklist2 + ')(?: [^>]*)?)\\s*>', 'g' ), '\n<$1>' );
 949              html = html.replace( new RegExp('\\s*</(' + blocklist2 + ')>\\s*', 'g' ), '</$1>\n' );
 950  
 951              // Indent <li>, <dt> and <dd> tags.
 952              html = html.replace( /<((li|dt|dd)[^>]*)>/g, ' \t<$1>' );
 953  
 954              // Fix line breaks around <select> and <option>.
 955              if ( html.indexOf( '<option' ) !== -1 ) {
 956                  html = html.replace( /\s*<option/g, '\n<option' );
 957                  html = html.replace( /\s*<\/select>/g, '\n</select>' );
 958              }
 959  
 960              // Pad <hr> with two line breaks.
 961              if ( html.indexOf( '<hr' ) !== -1 ) {
 962                  html = html.replace( /\s*<hr( [^>]*)?>\s*/g, '\n\n<hr$1>\n\n' );
 963              }
 964  
 965              // Remove line breaks in <object> tags.
 966              if ( html.indexOf( '<object' ) !== -1 ) {
 967                  html = html.replace( /<object[\s\S]+?<\/object>/g, function( a ) {
 968                      return a.replace( /[\r\n]+/g, '' );
 969                  });
 970              }
 971  
 972              // Unmark special paragraph closing tags.
 973              html = html.replace( /<\/p#>/g, '</p>\n' );
 974  
 975              // Pad remaining <p> tags whit a line break.
 976              html = html.replace( /\s*(<p [^>]+>[\s\S]*?<\/p>)/g, '\n$1' );
 977  
 978              // Trim.
 979              html = html.replace( /^\s+/, '' );
 980              html = html.replace( /[\s\u00a0]+$/, '' );
 981  
 982              if ( preserve_linebreaks ) {
 983                  html = html.replace( /<wp-line-break>/g, '\n' );
 984              }
 985  
 986              if ( preserve_br ) {
 987                  html = html.replace( /<wp-temp-br([^>]*)>/g, '<br$1>' );
 988              }
 989  
 990              // Restore preserved tags.
 991              if ( preserve.length ) {
 992                  html = html.replace( /<wp-preserve>/g, function() {
 993                      return preserve.shift();
 994                  } );
 995              }
 996  
 997              return html;
 998          }
 999  
1000          /**
1001           * Replaces two line breaks with a paragraph tag and one line break with a <br>.
1002           *
1003           * Similar to `wpautop()` in formatting.php.
1004           *
1005           * @since 2.5.0
1006           *
1007           * @memberof switchEditors
1008           *
1009           * @param {string} text The text input.
1010           * @return {string} The formatted text.
1011           */
1012  		function autop( text ) {
1013              var preserve_linebreaks = false,
1014                  preserve_br = false,
1015                  blocklist = 'table|thead|tfoot|caption|col|colgroup|tbody|tr|td|th|div|dl|dd|dt|ul|ol|li|pre' +
1016                      '|form|map|area|blockquote|address|math|style|p|h[1-6]|hr|fieldset|legend|section' +
1017                      '|article|aside|hgroup|header|footer|nav|figure|figcaption|details|menu|summary';
1018  
1019              // Normalize line breaks.
1020              text = text.replace( /\r\n|\r/g, '\n' );
1021  
1022              // Remove line breaks from <object>.
1023              if ( text.indexOf( '<object' ) !== -1 ) {
1024                  text = text.replace( /<object[\s\S]+?<\/object>/g, function( a ) {
1025                      return a.replace( /\n+/g, '' );
1026                  });
1027              }
1028  
1029              // Remove line breaks from tags.
1030              text = text.replace( /<[^<>]+>/g, function( a ) {
1031                  return a.replace( /[\n\t ]+/g, ' ' );
1032              });
1033  
1034              // Preserve line breaks in <pre> and <script> tags.
1035              if ( text.indexOf( '<pre' ) !== -1 || text.indexOf( '<script' ) !== -1 ) {
1036                  preserve_linebreaks = true;
1037                  text = text.replace( /<(pre|script)[^>]*>[\s\S]*?<\/\1>/g, function( a ) {
1038                      return a.replace( /\n/g, '<wp-line-break>' );
1039                  });
1040              }
1041  
1042              if ( text.indexOf( '<figcaption' ) !== -1 ) {
1043                  text = text.replace( /\s*(<figcaption[^>]*>)/g, '$1' );
1044                  text = text.replace( /<\/figcaption>\s*/g, '</figcaption>' );
1045              }
1046  
1047              // Keep <br> tags inside captions.
1048              if ( text.indexOf( '[caption' ) !== -1 ) {
1049                  preserve_br = true;
1050  
1051                  text = text.replace( /\[caption[\s\S]+?\[\/caption\]/g, function( a ) {
1052                      a = a.replace( /<br([^>]*)>/g, '<wp-temp-br$1>' );
1053  
1054                      a = a.replace( /<[^<>]+>/g, function( b ) {
1055                          return b.replace( /[\n\t ]+/, ' ' );
1056                      });
1057  
1058                      return a.replace( /\s*\n\s*/g, '<wp-temp-br />' );
1059                  });
1060              }
1061  
1062              text = text + '\n\n';
1063              text = text.replace( /<br \/>\s*<br \/>/gi, '\n\n' );
1064  
1065              // Pad block tags with two line breaks.
1066              text = text.replace( new RegExp( '(<(?:' + blocklist + ')(?: [^>]*)?>)', 'gi' ), '\n\n$1' );
1067              text = text.replace( new RegExp( '(</(?:' + blocklist + ')>)', 'gi' ), '$1\n\n' );
1068              text = text.replace( /<hr( [^>]*)?>/gi, '<hr$1>\n\n' );
1069  
1070              // Remove white space chars around <option>.
1071              text = text.replace( /\s*<option/gi, '<option' );
1072              text = text.replace( /<\/option>\s*/gi, '</option>' );
1073  
1074              // Normalize multiple line breaks and white space chars.
1075              text = text.replace( /\n\s*\n+/g, '\n\n' );
1076  
1077              // Convert two line breaks to a paragraph.
1078              text = text.replace( /([\s\S]+?)\n\n/g, '<p>$1</p>\n' );
1079  
1080              // Remove empty paragraphs.
1081              text = text.replace( /<p>\s*?<\/p>/gi, '');
1082  
1083              // Remove <p> tags that are around block tags.
1084              text = text.replace( new RegExp( '<p>\\s*(</?(?:' + blocklist + ')(?: [^>]*)?>)\\s*</p>', 'gi' ), '$1' );
1085              text = text.replace( /<p>(<li.+?)<\/p>/gi, '$1');
1086  
1087              // Fix <p> in blockquotes.
1088              text = text.replace( /<p>\s*<blockquote([^>]*)>/gi, '<blockquote$1><p>');
1089              text = text.replace( /<\/blockquote>\s*<\/p>/gi, '</p></blockquote>');
1090  
1091              // Remove <p> tags that are wrapped around block tags.
1092              text = text.replace( new RegExp( '<p>\\s*(</?(?:' + blocklist + ')(?: [^>]*)?>)', 'gi' ), '$1' );
1093              text = text.replace( new RegExp( '(</?(?:' + blocklist + ')(?: [^>]*)?>)\\s*</p>', 'gi' ), '$1' );
1094  
1095              text = text.replace( /(<br[^>]*>)\s*\n/gi, '$1' );
1096  
1097              // Add <br> tags.
1098              text = text.replace( /\s*\n/g, '<br />\n');
1099  
1100              // Remove <br> tags that are around block tags.
1101              text = text.replace( new RegExp( '(</?(?:' + blocklist + ')[^>]*>)\\s*<br />', 'gi' ), '$1' );
1102              text = text.replace( /<br \/>(\s*<\/?(?:p|li|div|dl|dd|dt|th|pre|td|ul|ol)>)/gi, '$1' );
1103  
1104              // Remove <p> and <br> around captions.
1105              text = text.replace( /(?:<p>|<br ?\/?>)*\s*\[caption([^\[]+)\[\/caption\]\s*(?:<\/p>|<br ?\/?>)*/gi, '[caption$1[/caption]' );
1106  
1107              // Make sure there is <p> when there is </p> inside block tags that can contain other blocks.
1108              text = text.replace( /(<(?:div|th|td|form|fieldset|dd)[^>]*>)(.*?)<\/p>/g, function( a, b, c ) {
1109                  if ( c.match( /<p( [^>]*)?>/ ) ) {
1110                      return a;
1111                  }
1112  
1113                  return b + '<p>' + c + '</p>';
1114              });
1115  
1116              // Restore the line breaks in <pre> and <script> tags.
1117              if ( preserve_linebreaks ) {
1118                  text = text.replace( /<wp-line-break>/g, '\n' );
1119              }
1120  
1121              // Restore the <br> tags in captions.
1122              if ( preserve_br ) {
1123                  text = text.replace( /<wp-temp-br([^>]*)>/g, '<br$1>' );
1124              }
1125  
1126              return text;
1127          }
1128  
1129          /**
1130           * Fires custom jQuery events `beforePreWpautop` and `afterPreWpautop` when jQuery is available.
1131           *
1132           * @since 2.9.0
1133           *
1134           * @memberof switchEditors
1135           *
1136           * @param {string} html The content from the visual editor.
1137           * @return {string} the filtered content.
1138           */
1139  		function pre_wpautop( html ) {
1140              var obj = { o: exports, data: html, unfiltered: html };
1141  
1142              if ( $ ) {
1143                  $( 'body' ).trigger( 'beforePreWpautop', [ obj ] );
1144              }
1145  
1146              obj.data = removep( obj.data );
1147  
1148              if ( $ ) {
1149                  $( 'body' ).trigger( 'afterPreWpautop', [ obj ] );
1150              }
1151  
1152              return obj.data;
1153          }
1154  
1155          /**
1156           * Fires custom jQuery events `beforeWpautop` and `afterWpautop` when jQuery is available.
1157           *
1158           * @since 2.9.0
1159           *
1160           * @memberof switchEditors
1161           *
1162           * @param {string} text The content from the text editor.
1163           * @return {string} filtered content.
1164           */
1165  		function wpautop( text ) {
1166              var obj = { o: exports, data: text, unfiltered: text };
1167  
1168              if ( $ ) {
1169                  $( 'body' ).trigger( 'beforeWpautop', [ obj ] );
1170              }
1171  
1172              obj.data = autop( obj.data );
1173  
1174              if ( $ ) {
1175                  $( 'body' ).trigger( 'afterWpautop', [ obj ] );
1176              }
1177  
1178              return obj.data;
1179          }
1180  
1181          if ( $ ) {
1182              $( init );
1183          } else if ( document.addEventListener ) {
1184              document.addEventListener( 'DOMContentLoaded', init, false );
1185              window.addEventListener( 'load', init, false );
1186          } else if ( window.attachEvent ) {
1187              window.attachEvent( 'onload', init );
1188              document.attachEvent( 'onreadystatechange', function() {
1189                  if ( 'complete' === document.readyState ) {
1190                      init();
1191                  }
1192              } );
1193          }
1194  
1195          wp.editor.autop = wpautop;
1196          wp.editor.removep = pre_wpautop;
1197  
1198          exports = {
1199              go: switchEditor,
1200              wpautop: wpautop,
1201              pre_wpautop: pre_wpautop,
1202              _wp_Autop: autop,
1203              _wp_Nop: removep
1204          };
1205  
1206          return exports;
1207      }
1208  
1209      /**
1210       * Expose the switch editors to be used globally.
1211       *
1212       * @namespace switchEditors
1213       */
1214      window.switchEditors = new SwitchEditors();
1215  
1216      /**
1217       * Initialize TinyMCE and/or Quicktags. For use with wp_enqueue_editor() (PHP).
1218       *
1219       * Intended for use with an existing textarea that will become the Code editor tab.
1220       * The editor width will be the width of the textarea container, height will be adjustable.
1221       *
1222       * Settings for both TinyMCE and Quicktags can be passed on initialization, and are "filtered"
1223       * with custom jQuery events on the document element, wp-before-tinymce-init and wp-before-quicktags-init.
1224       *
1225       * @since 4.8.0
1226       *
1227       * @param {string} id       The HTML id of the textarea that is used for the editor.
1228       *                          Has to be jQuery compliant. No brackets, special chars, etc.
1229       * @param {Object} settings The settings for initializing the editor.
1230       *
1231       * @example
1232       * ```javascript
1233       * settings = {
1234       *    // See https://www.tinymce.com/docs/configure/integration-and-setup/.
1235       *    // Alternatively set to `true` to use the defaults.
1236       *    tinymce: {
1237       *        setup: function( editor ) {
1238       *            console.log( 'Editor initialized', editor );
1239       *        }
1240       *    }
1241       *
1242       *    // Alternatively set to `true` to use the defaults.
1243       *      quicktags: {
1244       *        buttons: 'strong,em,link'
1245       *    }
1246       * }
1247       *
1248       * settings = {
1249       *    // See https://www.tinymce.com/docs/configure/integration-and-setup/.
1250       *    // Alternatively set to `true` to use the defaults.
1251       *    tinymce: {
1252       *        setup: function( editor ) {
1253       *            console.log( 'Editor initialized', editor );
1254       *        }
1255       *    }
1256       *
1257       *    // Alternatively set to `true` to use the defaults.
1258       *      quicktags: {
1259       *        buttons: 'strong,em,link'
1260       *    }
1261       * }
1262       * ```
1263       */
1264      wp.editor.initialize = function( id, settings ) {
1265          var init;
1266          var defaults;
1267  
1268          if ( ! $ || ! id || ! wp.editor.getDefaultSettings ) {
1269              return;
1270          }
1271  
1272          defaults = wp.editor.getDefaultSettings();
1273  
1274          // Initialize TinyMCE by default.
1275          if ( ! settings ) {
1276              settings = {
1277                  tinymce: true
1278              };
1279          }
1280  
1281          // Add wrap and the Visual|Code tabs.
1282          if ( settings.tinymce && settings.quicktags ) {
1283              var $textarea = $( '#' + id );
1284  
1285              var $wrap = $( '<div>' ).attr( {
1286                      'class': 'wp-core-ui wp-editor-wrap tmce-active',
1287                      id: 'wp-' + id + '-wrap'
1288                  } );
1289  
1290              var $editorContainer = $( '<div class="wp-editor-container">' );
1291  
1292              var $button = $( '<button>' ).attr( {
1293                      type: 'button',
1294                      'data-wp-editor-id': id
1295                  } );
1296  
1297              var $editorTools = $( '<div class="wp-editor-tools">' );
1298  
1299              if ( settings.mediaButtons ) {
1300                  var buttonText = 'Add Media';
1301  
1302                  if ( window._wpMediaViewsL10n && window._wpMediaViewsL10n.addMedia ) {
1303                      buttonText = window._wpMediaViewsL10n.addMedia;
1304                  }
1305  
1306                  var $addMediaButton = $( '<button type="button" class="button insert-media add_media">' );
1307  
1308                  $addMediaButton.append( '<span class="wp-media-buttons-icon" aria-hidden="true"></span>' );
1309                  $addMediaButton.append( document.createTextNode( ' ' + buttonText ) );
1310                  $addMediaButton.data( 'editor', id );
1311  
1312                  $editorTools.append(
1313                      $( '<div class="wp-media-buttons">' )
1314                          .append( $addMediaButton )
1315                  );
1316              }
1317  
1318              $wrap.append(
1319                  $editorTools
1320                      .append( $( '<div class="wp-editor-tabs">' )
1321                          .append( $button.clone().attr({
1322                              id: id + '-tmce',
1323                              'class': 'wp-switch-editor switch-tmce'
1324                          }).text( window.tinymce.translate( 'Visual' ) ) )
1325                          .append( $button.attr({
1326                              id: id + '-html',
1327                              'class': 'wp-switch-editor switch-html'
1328                          }).text( window.tinymce.translate( 'Code|tab' ) ) )
1329                      ).append( $editorContainer )
1330              );
1331  
1332              $textarea.after( $wrap );
1333              $editorContainer.append( $textarea );
1334          }
1335  
1336          if ( window.tinymce && settings.tinymce ) {
1337              if ( typeof settings.tinymce !== 'object' ) {
1338                  settings.tinymce = {};
1339              }
1340  
1341              init = $.extend( {}, defaults.tinymce, settings.tinymce );
1342              init.selector = '#' + id;
1343  
1344              $( document ).trigger( 'wp-before-tinymce-init', init );
1345              window.tinymce.init( init );
1346  
1347              if ( ! window.wpActiveEditor ) {
1348                  window.wpActiveEditor = id;
1349              }
1350          }
1351  
1352          if ( window.quicktags && settings.quicktags ) {
1353              if ( typeof settings.quicktags !== 'object' ) {
1354                  settings.quicktags = {};
1355              }
1356  
1357              init = $.extend( {}, defaults.quicktags, settings.quicktags );
1358              init.id = id;
1359  
1360              $( document ).trigger( 'wp-before-quicktags-init', init );
1361              window.quicktags( init );
1362  
1363              if ( ! window.wpActiveEditor ) {
1364                  window.wpActiveEditor = init.id;
1365              }
1366          }
1367      };
1368  
1369      /**
1370       * Remove one editor instance.
1371       *
1372       * Intended for use with editors that were initialized with wp.editor.initialize().
1373       *
1374       * @since 4.8.0
1375       *
1376       * @param {string} id The HTML id of the editor textarea.
1377       */
1378      wp.editor.remove = function( id ) {
1379          var mceInstance, qtInstance,
1380              $wrap = $( '#wp-' + id + '-wrap' );
1381  
1382          if ( window.tinymce ) {
1383              mceInstance = window.tinymce.get( id );
1384  
1385              if ( mceInstance ) {
1386                  if ( ! mceInstance.isHidden() ) {
1387                      mceInstance.save();
1388                  }
1389  
1390                  mceInstance.remove();
1391              }
1392          }
1393  
1394          if ( window.quicktags ) {
1395              qtInstance = window.QTags.getInstance( id );
1396  
1397              if ( qtInstance ) {
1398                  qtInstance.remove();
1399              }
1400          }
1401  
1402          if ( $wrap.length ) {
1403              $wrap.after( $( '#' + id ) );
1404              $wrap.remove();
1405          }
1406      };
1407  
1408      /**
1409       * Get the editor content.
1410       *
1411       * Intended for use with editors that were initialized with wp.editor.initialize().
1412       *
1413       * @since 4.8.0
1414       *
1415       * @param {string} id The HTML id of the editor textarea.
1416       * @return {void|string} The editor content.
1417       */
1418      wp.editor.getContent = function( id ) {
1419          var editor;
1420  
1421          if ( ! $ || ! id ) {
1422              return;
1423          }
1424  
1425          if ( window.tinymce ) {
1426              editor = window.tinymce.get( id );
1427  
1428              if ( editor && ! editor.isHidden() ) {
1429                  editor.save();
1430              }
1431          }
1432  
1433          return $( '#' + id ).val();
1434      };
1435  
1436  }( window.jQuery, window.wp ));


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