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# Copyright 2007 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Id$
from portage import flatten
from portage.dep import isvalidatom, match_from_list, \
best_match_to_list, dep_getkey, use_reduce, paren_reduce
from portage.exception import InvalidAtom
OPERATIONS = ["merge", "unmerge"]
class PackageSet(object):
# Set this to operations that are supported by your subclass. While
# technically there is no difference between "merge" and "unmerge" regarding
# package sets, the latter doesn't make sense for some sets like "system"
# or "security" and therefore isn't supported by them.
_operations = ["merge"]
description = "generic package set"
def __init__(self):
self._atoms = set()
self._atommap = {}
self._loaded = False
self._loading = False
self.errors = []
self._nonatoms = set()
def __contains__(self, atom):
return atom in self.getAtoms()
def __iter__(self):
for x in self.getAtoms():
yield x
def supportsOperation(self, op):
if not op in OPERATIONS:
raise ValueError(op)
return op in self._operations
def getAtoms(self):
if not (self._loaded or self._loading):
self._loading = True
self.load()
self._loaded = True
self._loading = False
return self._atoms
def getNonAtoms(self):
self.getAtoms()
return self._nonatoms
def _setAtoms(self, atoms):
atoms = map(str.strip, atoms)
nonatoms = set()
for a in atoms[:]:
if a == "":
atoms.remove(a)
elif not isvalidatom(a):
atoms.remove(a)
self._nonatoms.add(a)
self._atoms = set(atoms)
self._updateAtomMap()
def load(self):
# This method must be overwritten by subclasses
# Editable sets should use the value of self._mtime to determine if they
# need to reload themselves
raise NotImplementedError()
def containsCPV(self, cpv):
for a in self.getAtoms():
if match_from_list(a, [cpv]):
return True
return False
def getMetadata(self, key):
if hasattr(self, key.lower()):
return getattr(self, key.lower())
else:
return ""
def _updateAtomMap(self, atoms=None):
"""Update self._atommap for specific atoms or all atoms."""
if not atoms:
self._atommap.clear()
atoms = self._atoms
for a in atoms:
cp = dep_getkey(a)
self._atommap.setdefault(cp, set())
self._atommap[cp].add(a)
# Not sure if this one should really be in PackageSet
def findAtomForPackage(self, cpv, metadata):
"""Return the best match for a given package from the arguments, or
None if there are no matches. This matches virtual arguments against
the PROVIDE metadata. This can raise an InvalidDependString exception
if an error occurs while parsing PROVIDE."""
cpv_slot = "%s:%s" % (cpv, metadata["SLOT"])
cp = dep_getkey(cpv)
self.getAtoms() # make sure the atoms are loaded
atoms = self._atommap.get(cp)
if atoms:
best_match = best_match_to_list(cpv_slot, atoms)
if best_match:
return best_match
if not metadata["PROVIDE"]:
return None
provides = flatten(use_reduce(paren_reduce(metadata["PROVIDE"]),
uselist=metadata["USE"].split()))
for provide in provides:
provided_cp = dep_getkey(provide)
atoms = self._atommap.get(provided_cp)
if atoms:
atoms = list(atoms)
transformed_atoms = [atom.replace(provided_cp, cp) for atom in atoms]
best_match = best_match_to_list(cpv_slot, transformed_atoms)
if best_match:
return atoms[transformed_atoms.index(best_match)]
return None
class EditablePackageSet(PackageSet):
def update(self, atoms):
self.getAtoms()
self._atoms.update(atoms)
self._updateAtomMap(atoms=atoms)
self.write()
def add(self, atom):
self.update([atom])
def replace(self, atoms):
self._setAtoms(atoms)
self.write()
def remove(self, atom):
self.getAtoms()
self._atoms.discard(atom)
self._updateAtomMap()
self.write()
def removePackageAtoms(self, cp):
for a in list(self.getAtoms()):
if dep_getkey(a) == cp:
self.remove(a)
self.write()
def write(self):
# This method must be overwritten in subclasses that should be editable
raise NotImplementedError()
class InternalPackageSet(EditablePackageSet):
def __init__(self, initial_atoms=None):
super(InternalPackageSet, self).__init__()
if initial_atoms != None:
self.update(initial_atoms)
def clear(self):
self._atoms.clear()
self._updateAtomMap()
def load(self):
pass
def write(self):
pass
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