示例#1
0
 /** Create an iterator which returns the pair (key, sub-iterator) grouped by key(value). */
 public static PyIterator groupby(PyObject[] args, String[] kws) {
   ArgParser ap = new ArgParser("groupby", args, kws, "iterable", "key");
   if (args.length > 2) {
     throw Py.TypeError("groupby takes two arguments, iterable and key");
   }
   PyObject iterable = ap.getPyObject(0);
   PyObject key = ap.getPyObject(1, null);
   return new GroupBy(iterable, key);
 }
示例#2
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  @ExposedNew
  static final PyObject BufferedRandom___new__(
      PyNewWrapper new_, boolean init, PyType subtype, PyObject[] args, String[] keywords) {
    ArgParser ap = new ArgParser("__new__", args, keywords, new String[] {"raw", "buffering"});
    PyObject raw = ap.getPyObject(0, null);
    int buffering = ap.getInt(1, -1);

    BufferedRandom self;
    if (new_.for_type == subtype) {
      self = new BufferedRandom((RawIOBase) raw, buffering);
    } else {
      self = new BufferedRandom(subtype);
    }

    return self;
  }
示例#3
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  @ExposedNew
  @ExposedMethod
  public void Tuple___init__(PyObject[] args, String[] keywords) {
    ArgParser ap =
        new ArgParser(
            "Tuple", args, keywords, new String[] {"elts", "ctx", "lineno", "col_offset"}, 2, true);
    setElts(ap.getPyObject(0, Py.None));
    setCtx(ap.getPyObject(1, Py.None));
    int lin = ap.getInt(2, -1);
    if (lin != -1) {
      setLineno(lin);
    }

    int col = ap.getInt(3, -1);
    if (col != -1) {
      setLineno(col);
    }
  }
示例#4
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  @ExposedNew
  @ExposedMethod
  public void If___init__(PyObject[] args, String[] keywords) {
    ArgParser ap =
        new ArgParser(
            "If",
            args,
            keywords,
            new String[] {"test", "body", "orelse", "lineno", "col_offset"},
            3,
            true);
    setTest(ap.getPyObject(0, Py.None));
    setBody(ap.getPyObject(1, Py.None));
    setOrelse(ap.getPyObject(2, Py.None));
    int lin = ap.getInt(3, -1);
    if (lin != -1) {
      setLineno(lin);
    }

    int col = ap.getInt(4, -1);
    if (col != -1) {
      setLineno(col);
    }
  }
示例#5
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  @ExposedNew
  @ExposedMethod
  public void ImportFrom___init__(PyObject[] args, String[] keywords) {
    ArgParser ap =
        new ArgParser(
            "ImportFrom",
            args,
            keywords,
            new String[] {"module", "names", "level", "lineno", "col_offset"},
            3,
            true);
    setModule(ap.getPyObject(0, Py.None));
    setNames(ap.getPyObject(1, Py.None));
    setLevel(ap.getPyObject(2, Py.None));
    int lin = ap.getInt(3, -1);
    if (lin != -1) {
      setLineno(lin);
    }

    int col = ap.getInt(4, -1);
    if (col != -1) {
      setLineno(col);
    }
  }
示例#6
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 public Encoder(PyObject[] args, String[] kwds) {
   super();
   ArgParser ap =
       new ArgParser(
           "encoder",
           args,
           kwds,
           new String[] {
             "markers",
             "default",
             "encoder",
             "indent",
             "key_separator",
             "item_separator",
             "sort_keys",
             "skipkeys",
             "allow_nan"
           });
   ap.noKeywords();
   PyObject m = ap.getPyObject(0);
   markers = m == Py.None ? null : (PyDictionary) m;
   defaultfn = ap.getPyObject(1);
   encoder = ap.getPyObject(2);
   indent = ap.getPyObject(3);
   key_separator = ap.getPyObject(4);
   item_separator = ap.getPyObject(5);
   sort_keys = ap.getPyObject(6);
   skipkeys = ap.getPyObject(7).__nonzero__();
   allow_nan = ap.getPyObject(8).__nonzero__();
 }
示例#7
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 @ExposedNew
 @ExposedMethod
 public void Expression___init__(PyObject[] args, String[] keywords) {
   ArgParser ap = new ArgParser("Expression", args, keywords, new String[] {"body"}, 1);
   setBody(ap.getPyObject(0));
 }
示例#8
0
文件: _io.java 项目: Britefury/jython
  /**
   * Open file and return a stream. Raise IOError upon failure. This is a port to Java of the
   * CPython _io.open (Modules/_io/_iomodule.c) following the same logic, but expressed with the
   * benefits of Java syntax.
   *
   * @param args array of arguments from Python call via Jython framework
   * @param kwds array of keywords from Python call via Jython framework
   * @return the stream object
   */
  public static PyObject open(PyObject[] args, String[] kwds) {

    // Get the arguments to variables
    ArgParser ap = new ArgParser("open", args, kwds, openKwds, 1);
    PyObject file = ap.getPyObject(0);
    String m = ap.getString(1, "r");
    int buffering = ap.getInt(2, -1);
    final String encoding = ap.getString(3, null);
    final String errors = ap.getString(4, null);
    final String newline = ap.getString(5, null);
    boolean closefd = Py.py2boolean(ap.getPyObject(6, Py.True));

    // Decode the mode string
    OpenMode mode =
        new OpenMode(m) {

          @Override
          public void validate() {
            super.validate();
            validate(encoding, errors, newline);
          }
        };

    mode.checkValid();

    /*
     * Create the Raw file stream. Let the constructor deal with the variants and argument
     * checking.
     */
    PyFileIO raw = new PyFileIO(file, mode, closefd);

    /*
     * From the Python documentation for io.open() buffering = 0 to switch buffering off (only
     * allowed in binary mode), 1 to select line buffering (only usable in text mode), and an
     * integer > 1 to indicate the size of a fixed-size buffer.
     *
     * When no buffering argument is given, the default buffering policy works as follows:
     * Binary files are buffered in fixed-size chunks; "Interactive" text files (files for which
     * isatty() returns True) use line buffering. Other text files use the policy described
     * above for binary files.
     *
     * In Java, it seems a stream never is *known* to be interactive, but we ask anyway, and
     * maybe one day we shall know.
     */
    boolean line_buffering = false;

    if (buffering == 0) {
      if (!mode.binary) {
        throw Py.ValueError("can't have unbuffered text I/O");
      }
      return raw;

    } else if (buffering == 1) {
      // The stream is to be read line-by-line.
      line_buffering = true;
      // Force default size for actual buffer
      buffering = -1;

    } else if (buffering < 0 && raw.isatty()) {
      // No buffering argument given but stream is inteeractive.
      line_buffering = true;
    }

    if (buffering < 0) {
      /*
       * We are still being asked for the default buffer size. CPython establishes the default
       * buffer size using fstat(fd), but Java appears to give no clue. A useful study of
       * buffer sizes in NIO is http://www.evanjones.ca/software/java-bytebuffers.html . This
       * leads us to the fixed choice of _DEFAULT_BUFFER_SIZE (=8KB).
       */
      buffering = _DEFAULT_BUFFER_SIZE;
    }

    /*
     * We now know just what particular class of file we are opening, and therefore what stack
     * (buffering and text encoding) we should build.
     */
    if (buffering == 0) {
      // Not buffering, return the raw file object
      return raw;

    } else {
      // We are buffering, so wrap raw into a buffered file
      PyObject bufferType = null;
      PyObject io = imp.load("io");

      if (mode.updating) {
        bufferType = io.__getattr__("BufferedRandom");
      } else if (mode.writing || mode.appending) {
        bufferType = io.__getattr__("BufferedWriter");
      } else { // = reading
        bufferType = io.__getattr__("BufferedReader");
      }

      PyInteger pyBuffering = new PyInteger(buffering);
      PyObject buffer = bufferType.__call__(raw, pyBuffering);

      if (mode.binary) {
        // If binary, return the just the buffered file
        return buffer;

      } else {
        // We are opening in text mode, so wrap buffered file in a TextIOWrapper.
        PyObject textType = io.__getattr__("TextIOWrapper");
        PyObject[] textArgs = {
          buffer,
          ap.getPyObject(3, Py.None),
          ap.getPyObject(4, Py.None),
          ap.getPyObject(5, Py.None),
          Py.newBoolean(line_buffering)
        };
        PyObject wrapper = textType.__call__(textArgs);
        wrapper.__setattr__("mode", new PyString(m));
        return wrapper;
      }
    }
  }