3
# This program is free software; you can redistribute it and/or modify
4
# it under the terms of the GNU General Public License as published by
5
# the Free Software Foundation; either version 2 of the License, or
6
# (at your option) any later version.
8
# This program is distributed in the hope that it will be useful,
9
# but WITHOUT ANY WARRANTY; without even the implied warranty of
10
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11
# GNU General Public License for more details.
13
# You should have received a copy of the GNU General Public License
14
# along with this program; if not, write to the Free Software
15
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21
class RevisionReference(object):
23
Reference to a stored revision.
25
Includes the revision_id and revision_sha1.
29
def __init__(self, revision_id, revision_sha1=None):
30
if revision_id == None \
31
or isinstance(revision_id, basestring):
32
self.revision_id = revision_id
34
raise ValueError('bad revision_id %r' % revision_id)
36
if revision_sha1 != None:
37
if isinstance(revision_sha1, basestring) \
38
and len(revision_sha1) == 40:
39
self.revision_sha1 = revision_sha1
41
raise ValueError('bad revision_sha1 %r' % revision_sha1)
45
class Revision(object):
46
"""Single revision on a branch.
48
Revisions may know their revision_hash, but only once they've been
49
written out. This is not stored because you cannot write the hash
50
into the file it describes.
52
After bzr 0.0.5 revisions are allowed to have multiple parents.
55
List of parent revisions, each is a RevisionReference.
65
def __init__(self, **args):
66
self.__dict__.update(args)
71
return "<Revision id %s>" % self.revision_id
73
def __eq__(self, other):
74
if not isinstance(other, Revision):
76
return (self.inventory_id == other.inventory_id
77
and self.inventory_sha1 == other.inventory_sha1
78
and self.revision_id == other.revision_id
79
and self.timestamp == other.timestamp
80
and self.message == other.message
81
and self.timezone == other.timezone
82
and self.committer == other.committer)
84
def __ne__(self, other):
85
return not self.__eq__(other)
91
def validate_revision_id(rid):
92
"""Check rid is syntactically valid for a revision id."""
94
if not REVISION_ID_RE:
96
REVISION_ID_RE = re.compile('[\w.-]+@[\w.-]+--?\d+--?[0-9a-f]+\Z')
98
if not REVISION_ID_RE.match(rid):
99
raise ValueError("malformed revision-id %r" % rid)
101
def is_ancestor(revision_id, candidate_id, revision_source):
102
"""Return true if candidate_id is an ancestor of revision_id.
103
A false negative will be returned if any intermediate descendent of
104
candidate_id is not present in any of the revision_sources.
106
revisions_source is an object supporting a get_revision operation that
107
behaves like Branch's.
110
for ancestor_id, distance in iter_ancestors(revision_id, revision_source):
111
if ancestor_id == candidate_id:
115
def iter_ancestors(revision_id, revision_source, only_present=False):
116
ancestors = (revision_id,)
118
while len(ancestors) > 0:
120
for ancestor in ancestors:
122
yield ancestor, distance
124
revision = revision_source.get_revision(ancestor)
125
except bzrlib.errors.NoSuchRevision, e:
126
if e.revision == revision_id:
131
yield ancestor, distance
132
new_ancestors.extend([p.revision_id for p in revision.parents])
133
ancestors = new_ancestors
137
def find_present_ancestors(revision_id, revision_source):
138
"""Return the ancestors of a revision present in a branch.
140
It's possible that a branch won't have the complete ancestry of
141
one of its revisions.
145
anc_iter = enumerate(iter_ancestors(revision_id, revision_source,
147
for anc_order, (anc_id, anc_distance) in anc_iter:
148
if not found_ancestors.has_key(anc_id):
149
found_ancestors[anc_id] = (anc_order, anc_distance)
150
return found_ancestors
153
def __get_closest(intersection):
156
for entry in intersection:
157
if entry[0] == intersection[0][0]:
158
matches.append(entry[2])
162
def common_ancestor(revision_a, revision_b, revision_source):
163
"""Find the ancestor common to both revisions that is closest to both.
165
from bzrlib.trace import mutter
166
a_ancestors = find_present_ancestors(revision_a, revision_source)
167
b_ancestors = find_present_ancestors(revision_b, revision_source)
170
# a_order is used as a tie-breaker when two equally-good bases are found
171
for revision, (a_order, a_distance) in a_ancestors.iteritems():
172
if b_ancestors.has_key(revision):
173
a_intersection.append((a_distance, a_order, revision))
174
b_intersection.append((b_ancestors[revision][1], a_order, revision))
175
mutter("a intersection: %r" % a_intersection)
176
mutter("b intersection: %r" % b_intersection)
178
a_closest = __get_closest(a_intersection)
179
if len(a_closest) == 0:
181
b_closest = __get_closest(b_intersection)
182
assert len(b_closest) != 0
183
mutter ("a_closest %r" % a_closest)
184
mutter ("b_closest %r" % b_closest)
185
if a_closest[0] in b_closest:
187
elif b_closest[0] in a_closest:
190
raise bzrlib.errors.AmbiguousBase((a_closest[0], b_closest[0]))
193
class MultipleRevisionSources(object):
194
"""Proxy that looks in multiple branches for revisions."""
195
def __init__(self, *args):
196
object.__init__(self)
197
assert len(args) != 0
198
self._revision_sources = args
200
def get_revision(self, revision_id):
201
for source in self._revision_sources:
203
return source.get_revision(revision_id)
204
except bzrlib.errors.NoSuchRevision, e:
208
def get_intervening_revisions(ancestor_id, rev_id, rev_source,
209
revision_history=None):
210
"""Find the longest line of descent from maybe_ancestor to revision.
211
Revision history is followed where possible.
213
If ancestor_id == rev_id, list will be empty.
214
Otherwise, rev_id will be the last entry. ancestor_id will never appear.
215
If ancestor_id is not an ancestor, NotAncestor will be thrown
217
[rev_source.get_revision(r) for r in (ancestor_id, rev_id)]
218
if ancestor_id == rev_id:
220
def historical_lines(line):
221
"""Return a tuple of historical/non_historical lines, for sorting.
222
The non_historical count is negative, since non_historical lines are
227
for revision in line:
228
if revision in revision_history:
232
return good_count, bad_count
234
successful_lines = []
235
while len(active) > 0:
238
parent_ids = [p.revision_id for p in
239
rev_source.get_revision(line[-1]).parents]
240
for parent in parent_ids:
242
if parent == ancestor_id:
243
successful_lines.append(line_copy)
245
line_copy.append(parent)
246
new_active.append(line_copy)
248
if len(successful_lines) == 0:
249
raise bzrlib.errors.NotAncestor(rev_id, ancestor_id)
250
for line in successful_lines:
252
if revision_history is not None:
253
by_historical_lines = []
254
for line in successful_lines:
255
count = historical_lines(line)
256
by_historical_lines.append((count, line))
257
by_historical_lines.sort()
258
if by_historical_lines[-1][0][0] > 0:
259
return by_historical_lines[-1][1]
260
assert len(successful_lines)
261
successful_lines.sort(cmp, len)
262
return successful_lines[-1]
added
removed
bzrlib/revision.py
