summaryrefslogtreecommitdiffstats
path: root/bitbake/lib/bb/COW.py
diff options
context:
space:
mode:
Diffstat (limited to 'bitbake/lib/bb/COW.py')
-rw-r--r--bitbake/lib/bb/COW.py323
1 files changed, 0 insertions, 323 deletions
diff --git a/bitbake/lib/bb/COW.py b/bitbake/lib/bb/COW.py
deleted file mode 100644
index 6917ec378a..0000000000
--- a/bitbake/lib/bb/COW.py
+++ /dev/null
@@ -1,323 +0,0 @@
-# ex:ts=4:sw=4:sts=4:et
-# -*- tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*-
-#
-# This is a copy on write dictionary and set which abuses classes to try and be nice and fast.
-#
-# Copyright (C) 2006 Tim Amsell
-#
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License version 2 as
-# published by the Free Software Foundation.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License along
-# with this program; if not, write to the Free Software Foundation, Inc.,
-# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
-#
-#Please Note:
-# Be careful when using mutable types (ie Dict and Lists) - operations involving these are SLOW.
-# Assign a file to __warn__ to get warnings about slow operations.
-#
-
-from __future__ import print_function
-import copy
-import types
-ImmutableTypes = (
- types.NoneType,
- bool,
- complex,
- float,
- int,
- long,
- tuple,
- frozenset,
- basestring
-)
-
-MUTABLE = "__mutable__"
-
-class COWMeta(type):
- pass
-
-class COWDictMeta(COWMeta):
- __warn__ = False
- __hasmutable__ = False
- __marker__ = tuple()
-
- def __str__(cls):
- # FIXME: I have magic numbers!
- return "<COWDict Level: %i Current Keys: %i>" % (cls.__count__, len(cls.__dict__) - 3)
- __repr__ = __str__
-
- def cow(cls):
- class C(cls):
- __count__ = cls.__count__ + 1
- return C
- copy = cow
- __call__ = cow
-
- def __setitem__(cls, key, value):
- if not isinstance(value, ImmutableTypes):
- if not isinstance(value, COWMeta):
- cls.__hasmutable__ = True
- key += MUTABLE
- setattr(cls, key, value)
-
- def __getmutable__(cls, key, readonly=False):
- nkey = key + MUTABLE
- try:
- return cls.__dict__[nkey]
- except KeyError:
- pass
-
- value = getattr(cls, nkey)
- if readonly:
- return value
-
- if not cls.__warn__ is False and not isinstance(value, COWMeta):
- print("Warning: Doing a copy because %s is a mutable type." % key, file=cls.__warn__)
- try:
- value = value.copy()
- except AttributeError as e:
- value = copy.copy(value)
- setattr(cls, nkey, value)
- return value
-
- __getmarker__ = []
- def __getreadonly__(cls, key, default=__getmarker__):
- """\
- Get a value (even if mutable) which you promise not to change.
- """
- return cls.__getitem__(key, default, True)
-
- def __getitem__(cls, key, default=__getmarker__, readonly=False):
- try:
- try:
- value = getattr(cls, key)
- except AttributeError:
- value = cls.__getmutable__(key, readonly)
-
- # This is for values which have been deleted
- if value is cls.__marker__:
- raise AttributeError("key %s does not exist." % key)
-
- return value
- except AttributeError as e:
- if not default is cls.__getmarker__:
- return default
-
- raise KeyError(str(e))
-
- def __delitem__(cls, key):
- cls.__setitem__(key, cls.__marker__)
-
- def __revertitem__(cls, key):
- if not cls.__dict__.has_key(key):
- key += MUTABLE
- delattr(cls, key)
-
- def __contains__(cls, key):
- return cls.has_key(key)
-
- def has_key(cls, key):
- value = cls.__getreadonly__(key, cls.__marker__)
- if value is cls.__marker__:
- return False
- return True
-
- def iter(cls, type, readonly=False):
- for key in dir(cls):
- if key.startswith("__"):
- continue
-
- if key.endswith(MUTABLE):
- key = key[:-len(MUTABLE)]
-
- if type == "keys":
- yield key
-
- try:
- if readonly:
- value = cls.__getreadonly__(key)
- else:
- value = cls[key]
- except KeyError:
- continue
-
- if type == "values":
- yield value
- if type == "items":
- yield (key, value)
- raise StopIteration()
-
- def iterkeys(cls):
- return cls.iter("keys")
- def itervalues(cls, readonly=False):
- if not cls.__warn__ is False and cls.__hasmutable__ and readonly is False:
- print("Warning: If you arn't going to change any of the values call with True.", file=cls.__warn__)
- return cls.iter("values", readonly)
- def iteritems(cls, readonly=False):
- if not cls.__warn__ is False and cls.__hasmutable__ and readonly is False:
- print("Warning: If you arn't going to change any of the values call with True.", file=cls.__warn__)
- return cls.iter("items", readonly)
-
-class COWSetMeta(COWDictMeta):
- def __str__(cls):
- # FIXME: I have magic numbers!
- return "<COWSet Level: %i Current Keys: %i>" % (cls.__count__, len(cls.__dict__) -3)
- __repr__ = __str__
-
- def cow(cls):
- class C(cls):
- __count__ = cls.__count__ + 1
- return C
-
- def add(cls, value):
- COWDictMeta.__setitem__(cls, repr(hash(value)), value)
-
- def remove(cls, value):
- COWDictMeta.__delitem__(cls, repr(hash(value)))
-
- def __in__(cls, value):
- return COWDictMeta.has_key(repr(hash(value)))
-
- def iterkeys(cls):
- raise TypeError("sets don't have keys")
-
- def iteritems(cls):
- raise TypeError("sets don't have 'items'")
-
-# These are the actual classes you use!
-class COWDictBase(object):
- __metaclass__ = COWDictMeta
- __count__ = 0
-
-class COWSetBase(object):
- __metaclass__ = COWSetMeta
- __count__ = 0
-
-if __name__ == "__main__":
- import sys
- COWDictBase.__warn__ = sys.stderr
- a = COWDictBase()
- print("a", a)
-
- a['a'] = 'a'
- a['b'] = 'b'
- a['dict'] = {}
-
- b = a.copy()
- print("b", b)
- b['c'] = 'b'
-
- print()
-
- print("a", a)
- for x in a.iteritems():
- print(x)
- print("--")
- print("b", b)
- for x in b.iteritems():
- print(x)
- print()
-
- b['dict']['a'] = 'b'
- b['a'] = 'c'
-
- print("a", a)
- for x in a.iteritems():
- print(x)
- print("--")
- print("b", b)
- for x in b.iteritems():
- print(x)
- print()
-
- try:
- b['dict2']
- except KeyError as e:
- print("Okay!")
-
- a['set'] = COWSetBase()
- a['set'].add("o1")
- a['set'].add("o1")
- a['set'].add("o2")
-
- print("a", a)
- for x in a['set'].itervalues():
- print(x)
- print("--")
- print("b", b)
- for x in b['set'].itervalues():
- print(x)
- print()
-
- b['set'].add('o3')
-
- print("a", a)
- for x in a['set'].itervalues():
- print(x)
- print("--")
- print("b", b)
- for x in b['set'].itervalues():
- print(x)
- print()
-
- a['set2'] = set()
- a['set2'].add("o1")
- a['set2'].add("o1")
- a['set2'].add("o2")
-
- print("a", a)
- for x in a.iteritems():
- print(x)
- print("--")
- print("b", b)
- for x in b.iteritems(readonly=True):
- print(x)
- print()
-
- del b['b']
- try:
- print(b['b'])
- except KeyError:
- print("Yay! deleted key raises error")
-
- if b.has_key('b'):
- print("Boo!")
- else:
- print("Yay - has_key with delete works!")
-
- print("a", a)
- for x in a.iteritems():
- print(x)
- print("--")
- print("b", b)
- for x in b.iteritems(readonly=True):
- print(x)
- print()
-
- b.__revertitem__('b')
-
- print("a", a)
- for x in a.iteritems():
- print(x)
- print("--")
- print("b", b)
- for x in b.iteritems(readonly=True):
- print(x)
- print()
-
- b.__revertitem__('dict')
- print("a", a)
- for x in a.iteritems():
- print(x)
- print("--")
- print("b", b)
- for x in b.iteritems(readonly=True):
- print(x)
- print()
generated by cgit 1.2.3-korg (git 2.39.0) at 2024-05-19 07:26:16 +0000