File: trailingspace.js

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CodeMirror.defineOption("showTrailingSpace", false, function(cm, val, prev) {
  if (prev == CodeMirror.Init) prev = false;
  if (prev && !val)
    cm.removeOverlay("trailingspace");
  else if (!prev && val)
    cm.addOverlay({
      token: function(stream) {
        for (var l = stream.string.length, i = l; i && /\s/.test(stream.string.charAt(i - 1)); --i) {}
        if (i > stream.pos) { stream.pos = i; return null; }
        stream.pos = l;
        return "trailingspace";
      },
      name: "trailingspace"
    });
});