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#!/usr/bin/env python
# Copyright (c) 2005 Gavin E. Crooks <gec@threeplusone.com>
#
# This software is distributed under the MIT Open Source License.
# <http://www.opensource.org/licenses/mit-license.html>
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
"""
Null sequence IO. Acts like /dev/null. Read returns empty sequences or sequence lists,
writes do nothing.
"""
from typing import Iterator, Optional, TextIO
from ..seq import Alphabet, Seq, SeqList
names = ()
extensions = ()
def read(fin: TextIO, alphabet: Optional[Alphabet] = None) -> SeqList:
assert fin is not None # Do something with arguments to quiet pychecker
# if alphabet is not None:
# pass
return SeqList([])
def iterseq(fin: TextIO, alphabet: Optional[Alphabet] = None) -> Iterator[Seq]:
assert fin is not None
# if alphabet is not None:
# pass
yield Seq("")
return
def write(fout: TextIO, seqs: SeqList) -> None:
for s in seqs:
writeseq(fout, s)
def writeseq(fout: TextIO, seq: SeqList) -> None:
assert fout is not None
assert seq is not None
return
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