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   1  // CodeMirror, copyright (c) by Marijn Haverbeke and others
   2  // Distributed under an MIT license: https://codemirror.net/5/LICENSE
   3  
   4  (function(mod) {
   5    if (typeof exports == "object" && typeof module == "object") // CommonJS
   6      mod(require("../../lib/codemirror"));
   7    else if (typeof define == "function" && define.amd) // AMD
   8      define(["../../lib/codemirror"], mod);
   9    else // Plain browser env
  10      mod(CodeMirror);
  11  })(function(CodeMirror) {
  12    var nonspace = /\S/g;
  13    var repeat = String.prototype.repeat || function (n) { return Array(n + 1).join(this); };
  14    function continueComment(cm) {
  15      if (cm.getOption("disableInput")) return CodeMirror.Pass;
  16      var ranges = cm.listSelections(), mode, inserts = [];
  17      for (var i = 0; i < ranges.length; i++) {
  18        var pos = ranges[i].head
  19        if (!/\bcomment\b/.test(cm.getTokenTypeAt(pos))) return CodeMirror.Pass;
  20        var modeHere = cm.getModeAt(pos)
  21        if (!mode) mode = modeHere;
  22        else if (mode != modeHere) return CodeMirror.Pass;
  23  
  24        var insert = null, line, found;
  25        var blockStart = mode.blockCommentStart, lineCmt = mode.lineComment;
  26        if (blockStart && mode.blockCommentContinue) {
  27          line = cm.getLine(pos.line);
  28          var end = line.lastIndexOf(mode.blockCommentEnd, pos.ch - mode.blockCommentEnd.length);
  29          // 1. if this block comment ended
  30          // 2. if this is actually inside a line comment
  31          if (end != -1 && end == pos.ch - mode.blockCommentEnd.length ||
  32              lineCmt && (found = line.lastIndexOf(lineCmt, pos.ch - 1)) > -1 &&
  33              /\bcomment\b/.test(cm.getTokenTypeAt({line: pos.line, ch: found + 1}))) {
  34            // ...then don't continue it
  35          } else if (pos.ch >= blockStart.length &&
  36                     (found = line.lastIndexOf(blockStart, pos.ch - blockStart.length)) > -1 &&
  37                     found > end) {
  38            // reuse the existing leading spaces/tabs/mixed
  39            // or build the correct indent using CM's tab/indent options
  40            if (nonspaceAfter(0, line) >= found) {
  41              insert = line.slice(0, found);
  42            } else {
  43              var tabSize = cm.options.tabSize, numTabs;
  44              found = CodeMirror.countColumn(line, found, tabSize);
  45              insert = !cm.options.indentWithTabs ? repeat.call(" ", found) :
  46                repeat.call("\t", (numTabs = Math.floor(found / tabSize))) +
  47                repeat.call(" ", found - tabSize * numTabs);
  48            }
  49          } else if ((found = line.indexOf(mode.blockCommentContinue)) > -1 &&
  50                     found <= pos.ch &&
  51                     found <= nonspaceAfter(0, line)) {
  52            insert = line.slice(0, found);
  53          }
  54          if (insert != null) insert += mode.blockCommentContinue
  55        }
  56        if (insert == null && lineCmt && continueLineCommentEnabled(cm)) {
  57          if (line == null) line = cm.getLine(pos.line);
  58          found = line.indexOf(lineCmt);
  59          // cursor at pos 0, line comment also at pos 0 => shift it down, don't continue
  60          if (!pos.ch && !found) insert = "";
  61          // continue only if the line starts with an optional space + line comment
  62          else if (found > -1 && nonspaceAfter(0, line) >= found) {
  63            // don't continue if there's only space(s) after cursor or the end of the line
  64            insert = nonspaceAfter(pos.ch, line) > -1;
  65            // but always continue if the next line starts with a line comment too
  66            if (!insert) {
  67              var next = cm.getLine(pos.line + 1) || '',
  68                  nextFound = next.indexOf(lineCmt);
  69              insert = nextFound > -1 && nonspaceAfter(0, next) >= nextFound || null;
  70            }
  71            if (insert) {
  72              insert = line.slice(0, found) + lineCmt +
  73                       line.slice(found + lineCmt.length).match(/^\s*/)[0];
  74            }
  75          }
  76        }
  77        if (insert == null) return CodeMirror.Pass;
  78        inserts[i] = "\n" + insert;
  79      }
  80  
  81      cm.operation(function() {
  82        for (var i = ranges.length - 1; i >= 0; i--)
  83          cm.replaceRange(inserts[i], ranges[i].from(), ranges[i].to(), "+insert");
  84      });
  85    }
  86  
  87    function nonspaceAfter(ch, str) {
  88      nonspace.lastIndex = ch;
  89      var m = nonspace.exec(str);
  90      return m ? m.index : -1;
  91    }
  92  
  93    function continueLineCommentEnabled(cm) {
  94      var opt = cm.getOption("continueComments");
  95      if (opt && typeof opt == "object")
  96        return opt.continueLineComment !== false;
  97      return true;
  98    }
  99  
 100    CodeMirror.defineOption("continueComments", null, function(cm, val, prev) {
 101      if (prev && prev != CodeMirror.Init)
 102        cm.removeKeyMap("continueComment");
 103      if (val) {
 104        var key = "Enter";
 105        if (typeof val == "string")
 106          key = val;
 107        else if (typeof val == "object" && val.key)
 108          key = val.key;
 109        var map = {name: "continueComment"};
 110        map[key] = continueComment;
 111        cm.addKeyMap(map);
 112      }
 113    });
 114  });