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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    CodeMirror.defineOption("showTrailingSpace", false, function(cm, val, prev) {
  13      if (prev == CodeMirror.Init) prev = false;
  14      if (prev && !val)
  15        cm.removeOverlay("trailingspace");
  16      else if (!prev && val)
  17        cm.addOverlay({
  18          token: function(stream) {
  19            for (var l = stream.string.length, i = l; i && /\s/.test(stream.string.charAt(i - 1)); --i) {}
  20            if (i > stream.pos) { stream.pos = i; return null; }
  21            stream.pos = l;
  22            return "trailingspace";
  23          },
  24          name: "trailingspace"
  25        });
  26    });
  27  });