from cis_interface import serialize, backwards
from cis_interface.communication.AsciiFileComm import AsciiFileComm
from cis_interface.schema import register_component, inherit_schema
[docs]@register_component
class AsciiTableComm(AsciiFileComm):
r"""Class for handling I/O from/to a file on disk.
Args:
name (str): The environment variable where communication address is
stored.
delimiter (str, optional): String that should be used to separate
columns. If not provided and format_str is not set prior to I/O,
this defaults to whitespace.
use_astropy (bool, optional): If True and the astropy package is
installed, it will be used to read/write the table. Defaults to
False.
**kwargs: Additional keywords arguments are passed to parent class.
"""
_filetype = 'table'
_schema = inherit_schema(AsciiFileComm._schema, 'filetype', _filetype,
delimiter={'type': 'string', 'required': False},
use_astropy={'type': 'boolean', 'required': False})
def _init_before_open(self, delimiter=None, use_astropy=False,
serializer_kwargs=None, **kwargs):
r"""Set up dataio and attributes."""
if serializer_kwargs is None:
serializer_kwargs = {}
self.header_was_read = False
self.header_was_written = False
serializer_kwargs.update(stype=3, use_astropy=use_astropy)
kwargs['serializer_kwargs'] = serializer_kwargs
super(AsciiTableComm, self)._init_before_open(**kwargs)
if self.serializer.as_array:
self.read_meth = 'read'
else:
self.read_meth = 'readline'
if self.append:
self.header_was_written = True
if delimiter is None:
delimiter = serialize._default_delimiter
self.delimiter = backwards.unicode2bytes(delimiter)
[docs] def record_position(self):
r"""Record the current position in the file/series."""
pos, ind = super(AsciiTableComm, self).record_position()
return pos, ind, self.header_was_read, self.header_was_written
[docs] def change_position(self, file_pos, series_index=None,
header_was_read=None, header_was_written=None):
r"""Change the position in the file/series.
Args:
file_pos (int): Position that should be moved to in the file.
series_index (int, optinal): Index of the file in the series that
should be moved to. Defaults to None and will be set to the
current series index.
header_was_read (bool, optional): Status of if header has been
read or not. Defaults to None and will be set to the current
value.
header_was_written (bool, optional): Status of if header has been
written or not. Defaults to None and will be set to the current
value.
"""
if header_was_read is None:
header_was_read = self.header_was_read
if header_was_written is None:
header_was_written = self.header_was_written
super(AsciiTableComm, self).change_position(file_pos, series_index)
self.header_was_read = header_was_read
self.header_was_written = header_was_written
[docs] def advance_in_series(self, *args, **kwargs):
r"""Advance to a certain file in a series.
Args:
index (int, optional): Index of file in the series that should be
moved to. Defaults to None and call will advance to the next
file in the series.
Returns:
bool: True if the file was advanced in the series, False otherwise.
"""
out = super(AsciiTableComm, self).advance_in_series(*args, **kwargs)
if out:
self.header_was_read = False
self.header_was_written = False
return out
def _send(self, msg):
r"""Write message to a file.
Args:
msg (bytes, str): Data to write to the file.
Returns:
bool: Success or failure of writing to the file.
"""
if msg != self.eof_msg:
self.write_header()
return super(AsciiTableComm, self)._send(msg)
def _recv(self, timeout=0, **kwargs):
r"""Reads message from a file.
Args:
timeout (float, optional): Time in seconds to wait for a message.
Defaults to self.recv_timeout. Unused.
Returns:
tuple(bool, str): Success or failure of reading from the file.
"""
self.read_header()
return super(AsciiTableComm, self)._recv(timeout=timeout, **kwargs)