private static void output(ConstraintParser parser, String outputFile) throws IOException {
String output = parser.parse();
if (StringUtils.isEmpty(outputFile)) {
System.out.println(output);
} else {
File file = new File(outputFile);
file.getParentFile().mkdirs();
try (Writer writer = new OutputStreamWriter(new FileOutputStream(file), "utf-8")) {
writer.write(output);
}
}
}