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# Copyright (c) 2016 Egor Tensin <Egor.Tensin@gmail.com>
# This file is part of the "VK scripts" project.
# For details, see https://github.com/egor-tensin/vk-scripts.
# Distributed under the MIT License.
from enum import Enum
import sys
from vk.utils import io
from . import backend
class Format(Enum):
CSV = 'csv'
LOG = 'log'
NULL = 'null'
def __str__(self):
return self.value
def create_writer(self, fd=sys.stdout):
if self is Format.CSV:
return backend.csv.Writer(fd)
if self is Format.LOG:
return backend.log.Writer(fd)
if self is Format.NULL:
return backend.null.Writer()
raise NotImplementedError('unsupported database format: ' + str(self))
def open_output_file(self, path=None):
if self is Format.CSV:
return self._open_output_database_file(path)
if self is Format.LOG:
return self._open_output_log_file(path)
if self is Format.NULL:
return self._open_output_database_file(None)
raise NotImplementedError('unsupported database format: ' + str(self))
@staticmethod
def _open_output_log_file(path):
return io.open_output_text_file(path, mode='a')
@staticmethod
def _open_output_database_file(path):
return io.open_output_text_file(path, mode='x')
def create_reader(self, fd=sys.stdin):
if self is Format.CSV:
return backend.csv.Reader(fd)
if self is Format.LOG:
return NotImplementedError('cannot read from a log file')
if self is Format.NULL:
return backend.null.Reader()
raise NotImplementedError('unsupported database format: ' + str(self))
def open_input_file(self, path=None):
if self is Format.CSV:
return io.open_input_text_file(path)
if self is Format.LOG:
raise NotImplementedError('cannot read from a log file')
if self is Format.NULL:
return io.open_input_text_file(None)
raise NotImplementedError('unsupported database format: ' + str(self))
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