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# Copyright 2010-2012 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
__all__ = (
'ordered_by_atom_specificity', 'prune_incremental',
)
from _emerge.Package import Package
from portage.dep import best_match_to_list, _repo_separator
def ordered_by_atom_specificity(cpdict, pkg, repo=None):
"""
Return a list of matched values from the given cpdict,
in ascending order by atom specificity. The rationale
for this order is that package.* config files are
typically written in ChangeLog like fashion, so it's
most friendly if the order that the atoms are written
does not matter. Therefore, settings from more specific
atoms override those of less specific atoms. Without
this behavior, settings from relatively unspecific atoms
would (somewhat confusingly) override the settings of
more specific atoms, requiring people to make adjustments
to the order that atoms are listed in the config file in
order to achieve desired results (and thus corrupting
the ChangeLog like ordering of the file).
"""
if not hasattr(pkg, 'repo') and repo and repo != Package.UNKNOWN_REPO:
pkg = pkg + _repo_separator + repo
results = []
keys = list(cpdict)
while keys:
bestmatch = best_match_to_list(pkg, keys)
if bestmatch:
keys.remove(bestmatch)
results.append(cpdict[bestmatch])
else:
break
if results:
# reverse, so the most specific atoms come last
results.reverse()
return results
def prune_incremental(split):
"""
Prune off any parts of an incremental variable that are
made irrelevant by the latest occuring * or -*. This
could be more aggressive but that might be confusing
and the point is just to reduce noise a bit.
"""
for i, x in enumerate(reversed(split)):
if x == '*':
split = split[-i-1:]
break
elif x == '-*':
if i == 0:
split = []
else:
split = split[-i:]
break
return split
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