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# encoding: utf-8
# This file is part of requirements-parser library.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# SPDX-License-Identifier: Apache-2.0
import os
import warnings
from typing import Iterator, TextIO, Union
from .requirement import Requirement
_UNSUPPORTED_OPTIONS = {
'-c': 'Unused option -c (constraint). Skipping.',
'--constraint': 'Unused option -c (constraint). Skipping.',
'-r': 'Unused option -r (requirement). Skipping.',
'--requirement': 'Unused option -r (requirement). Skipping.',
'--no-binary': 'Unused option --no-binary. Skipping',
'--only-binary': 'Unused option --only-binary. Skipping',
'--prefer-binary': 'Unused option --prefer-binary. Skipping',
'--require-hashes': 'Unused option --require-hashes. Skipping',
'--pre': 'Unused option --pre. Skipping',
'--trusted-host': 'Unused option --trusted-host. Skipping',
'--use-feature': 'Unused option --use-feature. Skipping',
'-Z': 'Unused option -Z (always-unzip). Skipping.',
'--always-unzip': 'Unused option --always-unzip. Skipping.'
}
def parse(reqstr: Union[str, TextIO]) -> Iterator[Requirement]:
"""
Parse a requirements file into a list of Requirements
See: pip/req.py:parse_requirements()
:param reqstr: a string or file like object containing requirements
:returns: a *generator* of Requirement objects
"""
filename = getattr(reqstr, 'name', None)
# Python 3.x only
if not isinstance(reqstr, str):
reqstr = reqstr.read()
for line in reqstr.splitlines():
line = line.strip()
if line == '':
continue
elif not line or line.startswith('#'):
# comments are lines that start with # only
continue
elif not line or line.startswith('--hash='):
# hashes are lines that start with --hash=
continue
elif line.startswith(('-r', '--requirement')):
_, new_filename = line.split()
new_file_path = os.path.join(os.path.dirname(filename or '.'),
new_filename)
with open(new_file_path) as f:
for requirement in parse(f):
yield requirement
elif line.startswith('-f') or line.startswith('--find-links') or \
line.startswith('-i') or line.startswith('--index-url') or \
line.startswith('--extra-index-url') or \
line.startswith('--no-index'):
warnings.warn('Private repos not supported. Skipping.', stacklevel=2)
continue
else:
unsupported: bool = False
for param in _UNSUPPORTED_OPTIONS.keys():
if line.startswith(param):
warnings.warn(str(_UNSUPPORTED_OPTIONS.get(param)), stacklevel=2)
unsupported = True
# Otherwise, parse it
if not unsupported:
yield Requirement.parse(line)
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