Function BidiSpan

static/editor.md/lib/codemirror/lib/codemirror.js:8515–8518

(level, from, to)

    var outerType = "L";

    function BidiSpan(level, from, to) {
      this.level = level;
      this.from = from; this.to = to;
    }

    return function(str) {
      if (!bidiRE.test(str)) return false;