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# Copyright 2018 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
__all__ = (
'iter_iuse_vars',
)
def iter_iuse_vars(env):
"""
Iterate over (key, value) pairs of profile variables that contribute
to implicit IUSE for EAPI 5 and later.
@param env: Ebuild environment
@type env: Mapping
@rtype: iterator
@return: iterator over (key, value) pairs of profile variables
"""
for k in ('IUSE_IMPLICIT', 'USE_EXPAND_IMPLICIT', 'USE_EXPAND_UNPREFIXED', 'USE_EXPAND'):
v = env.get(k)
if v is not None:
yield (k, v)
use_expand_implicit = frozenset(env.get('USE_EXPAND_IMPLICIT', '').split())
for v in env.get('USE_EXPAND_UNPREFIXED', '').split() + env.get('USE_EXPAND', '').split():
if v in use_expand_implicit:
k = 'USE_EXPAND_VALUES_' + v
v = env.get(k)
if v is not None:
yield (k, v)
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