text: // CodeMirror, copyright (c) by Marijn Haverbeke and others
  // Distributed under an MIT license: https://codemirror.net/LICENSE
  
  (function(mod) {
    if (typeof exports == "object" && typeof module == "object") // CommonJS
      mod(require("../../lib/codemirror"));
    else if (typeof define == "function" && define.amd) // AMD
      define(["../../lib/codemirror"], mod);
    else // Plain browser env
      mod(CodeMirror);
  })(function(CodeMirror) {
    var nonspace = /\S/g;
    var repeat = String.prototype.repeat || function (n) { return Array(n + 1).join(this); };
    function continueComment(cm) {
      if (cm.getOption("disableInput")) return CodeMirror.Pass;
      var ranges = cm.listSelections(), mode, inserts = [];
      for (var i = 0; i < ranges.length; i++) {
        var pos = ranges[i].head
        if (!/\bcomment\b/.test(cm.getTokenTypeAt(pos))) return CodeMirror.Pass;
        var modeHere = cm.getModeAt(pos)
        if (!mode) mode = modeHere;
        else if (mode != modeHere) return CodeMirror.Pass;
  
        var insert = null, line, found;
        var blockStart = mode.blockCommentStart, lineCmt = mode.lineComment;
        if (blockStart && mode.blockCommentContinue) {
          line = cm.getLine(pos.line);
          var end = line.lastIndexOf(mode.blockCommentEnd, pos.ch - mode.blockCommentEnd.length);
          // 1. if this block comment ended
          // 2. if this is actually inside a line comment
          if (end != -1 && end == pos.ch - mode.blockCommentEnd.length ||
              lineCmt && (found = line.lastIndexOf(lineCmt, pos.ch - 1)) > -1 &&
              /\bcomment\b/.test(cm.getTokenTypeAt({line: pos.line, ch: found + 1}))) {
            // ...then don't continue it
          } else if (pos.ch >= blockStart.length &&
                     (found = line.lastIndexOf(blockStart, pos.ch - blockStart.length)) > -1 &&
                     found > end) {
            // reuse the existing leading spaces/tabs/mixed
            // or build the correct indent using CM's tab/indent options
            if (nonspaceAfter(0, line) >= found) {
              insert = line.slice(0, found);
            } else {
              var tabSize = cm.options.tabSize, numTabs;
              found = CodeMirror.countColumn(line, found, tabSize);
              insert = !cm.options.indentWithTabs ? repeat.call(" ", found) :
                repeat.call("\t", (numTabs = Math.floor(found / tabSize))) +
                repeat.call(" ", found - tabSize * numTabs);
            }
          } else if ((found = line.indexOf(mode.blockCommentContinue)) > -1 &&
                     found <= pos.ch &&
                     found <= nonspaceAfter(0, line)) {
            insert = line.slice(0, found);
          }
          if (insert != null) insert += mode.blockCommentContinue
        }
        if (insert == null && lineCmt && continueLineCommentEnabled(cm)) {
          if (line == null) line = cm.getLine(pos.line);
          found = line.indexOf(lineCmt);
          // cursor at pos 0, line comment also at pos 0 => shift it down, don't continue
          if (!pos.ch && !found) insert = "";
          // continue only if the line starts with an optional space + line comment
          else if (found > -1 && nonspaceAfter(0, line) >= found) {
            // don't continue if there's only space(s) after cursor or the end of the line
            insert = nonspaceAfter(pos.ch, line) > -1;
            // but always continue if the next line starts with a line comment too
            if (!insert) {
              var next = cm.getLine(pos.line + 1) || '',
                  nextFound = next.indexOf(lineCmt);
              insert = nextFound > -1 && nonspaceAfter(0, next) >= nextFound || null;
            }
            if (insert) {
              insert = line.slice(0, found) + lineCmt +
                       line.slice(found + lineCmt.length).match(/^\s*/)[0];
            }
          }
        }
        if (insert == null) return CodeMirror.Pass;
        inserts[i] = "\n" + insert;
      }
  
      cm.operation(function() {
        for (var i = ranges.length - 1; i >= 0; i--)
          cm.replaceRange(inserts[i], ranges[i].from(), ranges[i].to(), "+insert");
        var cursor = cm.cursorCoords(null, 'local');
        var scrollInfo = cm.getScrollInfo();
        var  visHeight = scrollInfo.top + scrollInfo.clientHeight;
        if (cursor.bottom > visHeight) {
          var scrollPosH = scrollInfo.top + (cursor.bottom - visHeight);
          cm.scrollTo(scrollInfo.left, scrollPosH);
        }
      });
    }
  
    function nonspaceAfter(ch, str) {
      nonspace.lastIndex = ch;
      var m = nonspace.exec(str);
      return m ? m.index : -1;
    }
  
    function continueLineCommentEnabled(cm) {
      var opt = cm.getOption("continueComments");
      if (opt && typeof opt == "object")
        return opt.continueLineComment !== false;
      return true;
    }
  
    CodeMirror.defineOption("continueComments", null, function(cm, val, prev) {
      if (prev && prev != CodeMirror.Init)
        cm.removeKeyMap("continueComment");
      if (val) {
        var key = "Enter";
        if (typeof val == "string")
          key = val;
        else if (typeof val == "object" && val.key)
          key = val.key;
        var map = {name: "continueComment"};
        map[key] = continueComment;
        cm.addKeyMap(map);
      }
    });
  });
  