InputOutputDeclarationSource.java 文件源码

private Object readRational(List<Object> parameters) {
  String rationalString = in.nextLine();

  MatrixLexer matrixLexer = new MatrixLexer(new ANTLRInputStream(rationalString));

  MatrixParser matrixParser = new MatrixParser(new CommonTokenStream(matrixLexer));

  try {
    MatrixParser.RationalContext rationalContext = matrixParser.rational();

    return Rational.fromRationalContext(rationalContext);
  } catch (ParseCancellationException e) {
    throw new InvalidReadRuntimeError("Invalid input read from stdin! Expected rational format!");
  }
}