Source code for cis_interface.communication.AsciiTableComm

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 read_header(self): r"""Read header lines from the file and update serializer info.""" if self.header_was_read: return pos = self.record_position() self.change_position(0) serialize.discover_header(self.fd, self.serializer, newline=self.newline, comment=self.comment, delimiter=self.delimiter) self.delimiter = self.serializer.table_info['delimiter'] self.change_position(*pos) self.header_was_read = True
[docs] def write_header(self): r"""Write header lines to the file based on the serializer info.""" if self.header_was_written: return header_msg = serialize.format_header( format_str=self.serializer.format_str, field_names=self.serializer.field_names, field_units=self.serializer.field_units, comment=self.comment, newline=self.newline, delimiter=self.delimiter) self.fd.write(header_msg) self.header_was_written = True
[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)