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# (C) 2005 Canonical
# 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
from xml import XMLMixin
try:
from cElementTree import Element, ElementTree, SubElement
except ImportError:
from elementtree.ElementTree import Element, ElementTree, SubElement
from errors import BzrError
class RevisionReference:
"""
Reference to a stored revision.
Includes the revision_id and revision_sha1.
"""
revision_id = None
revision_sha1 = None
def __init__(self, revision_id, revision_sha1):
if revision_id == None \
or isinstance(revision_id, basestring):
self.revision_id = revision_id
else:
raise ValueError('bad revision_id %r' % revision_id)
if revision_sha1 != None:
if isinstance(revision_sha1, basestring) \
and len(revision_sha1) == 40:
self.revision_sha1 = revision_sha1
else:
raise ValueError('bad revision_sha1 %r' % revision_sha1)
class Revision(XMLMixin):
"""Single revision on a branch.
Revisions may know their revision_hash, but only once they've been
written out. This is not stored because you cannot write the hash
into the file it describes.
After bzr 0.0.5 revisions are allowed to have multiple parents.
To support old clients this is written out in a slightly redundant
form: the first parent as the predecessor. This will eventually
be dropped.
parents
List of parent revisions, each is a RevisionReference.
"""
inventory_id = None
inventory_sha1 = None
revision_id = None
timestamp = None
message = None
timezone = None
committer = None
def __init__(self, **args):
self.__dict__.update(args)
self.parents = []
def _get_precursor(self):
from warnings import warn
warn("Revision.precursor is deprecated", stacklevel=2)
if self.parents:
return self.parents[0].revision_id
else:
return None
def _get_precursor_sha1(self):
from warnings import warn
warn("Revision.precursor_sha1 is deprecated", stacklevel=2)
if self.parents:
return self.parents[0].revision_sha1
else:
return None
def _fail(self):
raise Exception("can't assign to precursor anymore")
precursor = property(_get_precursor, _fail, _fail)
precursor_sha1 = property(_get_precursor_sha1, _fail, _fail)
def __repr__(self):
return "<Revision id %s>" % self.revision_id
def to_element(self):
root = Element('revision',
committer = self.committer,
timestamp = '%.9f' % self.timestamp,
revision_id = self.revision_id,
inventory_id = self.inventory_id,
inventory_sha1 = self.inventory_sha1,
)
if self.timezone:
root.set('timezone', str(self.timezone))
root.text = '\n'
msg = SubElement(root, 'message')
msg.text = self.message
msg.tail = '\n'
if self.parents:
# first parent stored as precursor for compatability with 0.0.5 and
# earlier
pr = self.parents[0]
assert pr.revision_id
root.set('precursor', pr.revision_id)
if pr.revision_sha1:
root.set('precursor_sha1', pr.revision_sha1)
if self.parents:
pelts = SubElement(root, 'parents')
pelts.tail = pelts.text = '\n'
for rr in self.parents:
assert isinstance(rr, RevisionReference)
p = SubElement(pelts, 'revision_ref')
p.tail = '\n'
assert rr.revision_id
p.set('revision_id', rr.revision_id)
if rr.revision_sha1:
p.set('revision_sha1', rr.revision_sha1)
return root
def from_element(cls, elt):
return unpack_revision(elt)
from_element = classmethod(from_element)
def unpack_revision(elt):
"""Convert XML element into Revision object."""
# <changeset> is deprecated...
if elt.tag not in ('revision', 'changeset'):
raise BzrError("unexpected tag in revision file: %r" % elt)
rev = Revision(committer = elt.get('committer'),
timestamp = float(elt.get('timestamp')),
revision_id = elt.get('revision_id'),
inventory_id = elt.get('inventory_id'),
inventory_sha1 = elt.get('inventory_sha1')
)
precursor = elt.get('precursor')
precursor_sha1 = elt.get('precursor_sha1')
pelts = elt.find('parents')
if precursor:
# revisions written prior to 0.0.5 have a single precursor
# give as an attribute
rev_ref = RevisionReference(precursor, precursor_sha1)
rev.parents.append(rev_ref)
elif pelts:
for p in pelts:
assert p.tag == 'revision_ref', \
"bad parent node tag %r" % p.tag
rev_ref = RevisionReference(p.get('revision_id'),
p.get('revision_sha1'))
rev.parents.append(rev_ref)
v = elt.get('timezone')
rev.timezone = v and int(v)
rev.message = elt.findtext('message') # text of <message>
return rev
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