function parsePart(str) {
  // just a number
  if(/^-?\d+$/.test(str)) {
    return parseInt(str, 10);
  }
  var m;
  // 1-5 or 1..5 (equivilant) or 1...5 (doesn't include 5)
  if((m = str.match(/^(-?\d+)(-|\.\.\.?|\u2025|\u2026|\u22EF)(-?\d+)$/))) {
    var lhs = m[1];
    var sep = m[2];
    var rhs = m[3];
    if(lhs && rhs) {
      lhs = parseInt(lhs);
      rhs = parseInt(rhs);
      var res = [];
      var incr = lhs < rhs ? 1 : -1;

      // Make it inclusive by moving the right 'stop-point' away by one.
      if(sep == '-' || sep == '..' || sep == '\u2025') {
        rhs += incr;
      }

      for(var i=lhs; i != rhs; i += incr) res.push(i);
      return res;
    }
  }
  return [];
}

module.exports.parse = function(str) {
  var parts = str.split(',');

  var toFlatten = parts.map(function(el) {
    return parsePart(el);
  });

  // reduce can't handle single element arrays
  if(toFlatten.length === 0) return [];
  if(toFlatten.length === 1) {
    if(Array.isArray(toFlatten[0]))
      return toFlatten[0];
    return toFlatten;
  }

  return toFlatten.reduce(function(lhs, rhs) {
    if(!Array.isArray(lhs)) lhs = [lhs];
    if(!Array.isArray(rhs)) rhs = [rhs];
    return lhs.concat(rhs);
  });
};