Tarball conversion

1 files changed, 82 insertions, 0 deletions

diff --git a/bzrlib/_static_tuple_py.py b/bzrlib/_static_tuple_py.py
new file mode 100644
index 0000000..a00592a
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+++ b/bzrlib/_static_tuple_py.py
@@ -0,0 +1,82 @@
+# Copyright (C) 2009, 2010 Canonical Ltd
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# 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
+
+"""The pure-python implementation of the StaticTuple type.
+
+Note that it is generally just implemented as using tuples of tuples of
+strings.
+"""
+
+from __future__ import absolute_import
+
+
+class StaticTuple(tuple):
+    """A static type, similar to a tuple of strings."""
+
+    __slots__ = ()
+
+    def __new__(cls, *args):
+        # Make the empty StaticTuple a singleton
+        if not args and _empty_tuple is not None:
+            return _empty_tuple
+        return tuple.__new__(cls, args)
+
+    def __init__(self, *args):
+        """Create a new 'StaticTuple'"""
+        num_keys = len(args)
+        if num_keys < 0 or num_keys > 255:
+            raise TypeError('StaticTuple(...) takes from 0 to 255 items')
+        for bit in args:
+            if type(bit) not in (str, StaticTuple, unicode, int, long, float,
+                                 None.__class__, bool):
+                raise TypeError('StaticTuple can only point to'
+                    ' StaticTuple, str, unicode, int, long, float, bool, or'
+                    ' None not %s' % (type(bit),))
+        # We don't need to pass args to tuple.__init__, because that was
+        # already handled in __new__.
+        tuple.__init__(self)
+
+    def __repr__(self):
+        return '%s%s' % (self.__class__.__name__, tuple.__repr__(self))
+
+    def __reduce__(self):
+        return (StaticTuple, tuple(self))
+
+    def __add__(self, other):
+        """Concatenate self with other"""
+        return StaticTuple.from_sequence(tuple.__add__(self,other))
+
+    def as_tuple(self):
+        return tuple(self)
+
+    def intern(self):
+        return _interned_tuples.setdefault(self, self)
+
+    @staticmethod
+    def from_sequence(seq):
+        """Convert a sequence object into a StaticTuple instance."""
+        if isinstance(seq, StaticTuple):
+            # it already is
+            return seq
+        return StaticTuple(*seq)
+
+
+
+# Have to set it to None first, so that __new__ can determine whether
+# the _empty_tuple singleton has been created yet or not.
+_empty_tuple = None
+_empty_tuple = StaticTuple()
+_interned_tuples = {}