GPQAPP

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