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# Copyright 2014 Pants project contributors (see CONTRIBUTORS.md).
# Licensed under the Apache License, Version 2.0 (see LICENSE).
from __future__ import absolute_import
from collections import Iterable
from pkg_resources import Requirement
from .compatibility import string as compatibility_string
REQUIRED_ATTRIBUTES = (
'extras',
'key',
'project_name',
'specs',
)
def quacks_like_req(req):
return all(hasattr(req, attr) for attr in REQUIRED_ATTRIBUTES)
def maybe_requirement(req):
if isinstance(req, Requirement) or quacks_like_req(req):
return req
elif isinstance(req, compatibility_string):
return Requirement.parse(req)
raise ValueError('Unknown requirement %r' % (req,))
def maybe_requirement_list(reqs):
if isinstance(reqs, (compatibility_string, Requirement)) or quacks_like_req(reqs):
return [maybe_requirement(reqs)]
elif isinstance(reqs, Iterable):
return [maybe_requirement(req) for req in reqs]
raise ValueError('Unknown requirement list %r' % (reqs,))
def requirement_is_exact(req):
return bool(req.specs and len(req.specs) == 1 and req.specs[0][0] == '==')
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