code: function getUnicodeRange() {
    const type = NodeType.UnicodeRangeType;
    const token = tokens[pos];
    const line = token.ln;
    const column = token.col;
    let content = [];
  
    while (pos < tokensLength) {
      if (checkSC(pos)) content = content.concat(getSC());
      else if (checkDelim(pos)) content.push(getDelim());
      else if (checkUrange(pos)) content.push(getUrange());
      else break;
    }
  
    return newNode(type, content, line, column);
  }
docs: Get a unicode range node
  @return {Node}