69
71
from copy import copy
70
72
from cStringIO import StringIO
73
from difflib import SequenceMatcher
75
from bzrlib.lazy_import import lazy_import
76
lazy_import(globals(), """
77
from bzrlib import tsort
78
from bzrlib.trace import mutter
84
79
from bzrlib.errors import (WeaveError, WeaveFormatError, WeaveParentMismatch,
85
80
RevisionAlreadyPresent,
86
81
RevisionNotPresent,
87
UnavailableRepresentation,
88
82
WeaveRevisionAlreadyPresent,
89
83
WeaveRevisionNotPresent,
91
from bzrlib.osutils import dirname, sha, sha_strings, split_lines
92
import bzrlib.patiencediff
93
from bzrlib.revision import NULL_REVISION
85
import bzrlib.errors as errors
86
from bzrlib.osutils import sha_strings
94
87
from bzrlib.symbol_versioning import *
95
from bzrlib.trace import mutter
96
from bzrlib.versionedfile import (
88
from bzrlib.tsort import topo_sort
89
from bzrlib.versionedfile import VersionedFile, InterVersionedFile
103
90
from bzrlib.weavefile import _read_weave_v5, write_weave_v5
106
class WeaveContentFactory(ContentFactory):
107
"""Content factory for streaming from weaves.
109
:seealso ContentFactory:
112
def __init__(self, version, weave):
113
"""Create a WeaveContentFactory for version from weave."""
114
ContentFactory.__init__(self)
115
self.sha1 = weave.get_sha1s([version])[version]
116
self.key = (version,)
117
parents = weave.get_parent_map([version])[version]
118
self.parents = tuple((parent,) for parent in parents)
119
self.storage_kind = 'fulltext'
122
def get_bytes_as(self, storage_kind):
123
if storage_kind == 'fulltext':
124
return self._weave.get_text(self.key[-1])
125
elif storage_kind == 'chunked':
126
return self._weave.get_lines(self.key[-1])
128
raise UnavailableRepresentation(self.key, storage_kind, 'fulltext')
131
93
class Weave(VersionedFile):
132
94
"""weave - versioned text file storage.
134
96
A Weave manages versions of line-based text files, keeping track
135
97
of the originating version for each line.
275
213
return self._parents == other._parents \
276
214
and self._weave == other._weave \
277
and self._sha1s == other._sha1s
215
and self._sha1s == other._sha1s
279
217
def __ne__(self, other):
280
218
return not self.__eq__(other)
220
@deprecated_method(zero_eight)
221
def idx_to_name(self, index):
222
"""Old public interface, the public interface is all names now."""
282
225
def _idx_to_name(self, version):
283
226
return self._names[version]
228
@deprecated_method(zero_eight)
229
def lookup(self, name):
230
"""Backwards compatability thunk:
232
Return name, as name is valid in the api now, and spew deprecation
285
237
def _lookup(self, name):
286
238
"""Convert symbolic version name to index."""
287
if not self._allow_reserved:
288
self.check_not_reserved_id(name)
290
240
return self._name_map[name]
292
242
raise RevisionNotPresent(name, self._weave_name)
244
@deprecated_method(zero_eight)
245
def iter_names(self):
246
"""Deprecated convenience function, please see VersionedFile.names()."""
247
return iter(self.names())
249
@deprecated_method(zero_eight)
251
"""See Weave.versions for the current api."""
252
return self.versions()
294
254
def versions(self):
295
255
"""See VersionedFile.versions."""
296
256
return self._names[:]
298
258
def has_version(self, version_id):
299
259
"""See VersionedFile.has_version."""
300
return (version_id in self._name_map)
260
return self._name_map.has_key(version_id)
302
262
__contains__ = has_version
304
def get_record_stream(self, versions, ordering, include_delta_closure):
305
"""Get a stream of records for versions.
307
:param versions: The versions to include. Each version is a tuple
309
:param ordering: Either 'unordered' or 'topological'. A topologically
310
sorted stream has compression parents strictly before their
312
:param include_delta_closure: If True then the closure across any
313
compression parents will be included (in the opaque data).
314
:return: An iterator of ContentFactory objects, each of which is only
315
valid until the iterator is advanced.
317
versions = [version[-1] for version in versions]
318
if ordering == 'topological':
319
parents = self.get_parent_map(versions)
320
new_versions = tsort.topo_sort(parents)
321
new_versions.extend(set(versions).difference(set(parents)))
322
versions = new_versions
323
elif ordering == 'groupcompress':
324
parents = self.get_parent_map(versions)
325
new_versions = sort_groupcompress(parents)
326
new_versions.extend(set(versions).difference(set(parents)))
327
versions = new_versions
328
for version in versions:
330
yield WeaveContentFactory(version, self)
332
yield AbsentContentFactory((version,))
334
def get_parent_map(self, version_ids):
335
"""See VersionedFile.get_parent_map."""
264
def get_delta(self, version_id):
265
"""See VersionedFile.get_delta."""
266
return self.get_deltas([version_id])[version_id]
268
def get_deltas(self, version_ids):
269
"""See VersionedFile.get_deltas."""
270
version_ids = self.get_ancestry(version_ids)
337
271
for version_id in version_ids:
338
if version_id == NULL_REVISION:
343
map(self._idx_to_name,
344
self._parents[self._lookup(version_id)]))
345
except RevisionNotPresent:
272
if not self.has_version(version_id):
273
raise RevisionNotPresent(version_id, self)
274
# try extracting all versions; parallel extraction is used
275
nv = self.num_versions()
281
last_parent_lines = {}
283
parent_inclusions = {}
288
# its simplest to generate a full set of prepared variables.
290
name = self._names[i]
291
sha1s[name] = self.get_sha1(name)
292
parents_list = self.get_parents(name)
294
parent = parents_list[0]
295
parents[name] = parent
296
parent_inclusions[name] = inclusions[parent]
299
parent_inclusions[name] = set()
300
# we want to emit start, finish, replacement_length, replacement_lines tuples.
301
diff_hunks[name] = []
302
current_hunks[name] = [0, 0, 0, []] # #start, finish, repl_length, repl_tuples
303
parent_linenums[name] = 0
305
parent_noeols[name] = False
306
last_parent_lines[name] = None
307
new_inc = set([name])
308
for p in self._parents[i]:
309
new_inc.update(inclusions[self._idx_to_name(p)])
310
# debug only, known good so far.
311
#assert set(new_inc) == set(self.get_ancestry(name)), \
312
# 'failed %s != %s' % (set(new_inc), set(self.get_ancestry(name)))
313
inclusions[name] = new_inc
315
nlines = len(self._weave)
317
for lineno, inserted, deletes, line in self._walk_internal():
318
# a line is active in a version if:
319
# insert is in the versions inclusions
321
# deleteset & the versions inclusions is an empty set.
322
# so - if we have a included by mapping - version is included by
323
# children, we get a list of children to examine for deletes affect
324
# ing them, which is less than the entire set of children.
325
for version_id in version_ids:
326
# The active inclusion must be an ancestor,
327
# and no ancestors must have deleted this line,
328
# because we don't support resurrection.
329
parent_inclusion = parent_inclusions[version_id]
330
inclusion = inclusions[version_id]
331
parent_active = inserted in parent_inclusion and not (deletes & parent_inclusion)
332
version_active = inserted in inclusion and not (deletes & inclusion)
333
if not parent_active and not version_active:
334
# unrelated line of ancestry
347
result[version_id] = parents
336
elif parent_active and version_active:
338
parent_linenum = parent_linenums[version_id]
339
if current_hunks[version_id] != [parent_linenum, parent_linenum, 0, []]:
340
diff_hunks[version_id].append(tuple(current_hunks[version_id]))
342
current_hunks[version_id] = [parent_linenum, parent_linenum, 0, []]
343
parent_linenums[version_id] = parent_linenum
346
noeols[version_id] = True
349
elif parent_active and not version_active:
351
current_hunks[version_id][1] += 1
352
parent_linenums[version_id] += 1
353
last_parent_lines[version_id] = line
354
elif not parent_active and version_active:
356
# noeol only occurs at the end of a file because we
357
# diff linewise. We want to show noeol changes as a
358
# empty diff unless the actual eol-less content changed.
361
if last_parent_lines[version_id][-1] != '\n':
362
parent_noeols[version_id] = True
363
except (TypeError, IndexError):
366
if theline[-1] != '\n':
367
noeols[version_id] = True
371
parent_should_go = False
373
if parent_noeols[version_id] == noeols[version_id]:
374
# no noeol toggle, so trust the weaves statement
375
# that this line is changed.
377
if parent_noeols[version_id]:
378
theline = theline + '\n'
379
elif parent_noeols[version_id]:
380
# parent has no eol, we do:
381
# our line is new, report as such..
383
elif noeols[version_id]:
384
# append a eol so that it looks like
386
theline = theline + '\n'
387
if parents[version_id] is not None:
388
#if last_parent_lines[version_id] is not None:
389
parent_should_go = True
390
if last_parent_lines[version_id] != theline:
393
#parent_should_go = False
395
current_hunks[version_id][2] += 1
396
current_hunks[version_id][3].append((inserted, theline))
398
# last hunk last parent line is not eaten
399
current_hunks[version_id][1] -= 1
400
if current_hunks[version_id][1] < 0:
401
current_hunks[version_id][1] = 0
402
# import pdb;pdb.set_trace()
403
# assert current_hunks[version_id][1] >= 0
407
version = self._idx_to_name(i)
408
if current_hunks[version] != [0, 0, 0, []]:
409
diff_hunks[version].append(tuple(current_hunks[version]))
411
for version_id in version_ids:
412
result[version_id] = (
416
diff_hunks[version_id],
350
def get_parents_with_ghosts(self, version_id):
351
raise NotImplementedError(self.get_parents_with_ghosts)
353
def insert_record_stream(self, stream):
354
"""Insert a record stream into this versioned file.
356
:param stream: A stream of records to insert.
358
:seealso VersionedFile.get_record_stream:
361
for record in stream:
362
# Raise an error when a record is missing.
363
if record.storage_kind == 'absent':
364
raise RevisionNotPresent([record.key[0]], self)
365
# adapt to non-tuple interface
366
parents = [parent[0] for parent in record.parents]
367
if (record.storage_kind == 'fulltext'
368
or record.storage_kind == 'chunked'):
369
self.add_lines(record.key[0], parents,
370
osutils.chunks_to_lines(record.get_bytes_as('chunked')))
372
adapter_key = record.storage_kind, 'fulltext'
374
adapter = adapters[adapter_key]
376
adapter_factory = adapter_registry.get(adapter_key)
377
adapter = adapter_factory(self)
378
adapters[adapter_key] = adapter
379
lines = split_lines(adapter.get_bytes(record))
381
self.add_lines(record.key[0], parents, lines)
382
except RevisionAlreadyPresent:
420
def get_parents(self, version_id):
421
"""See VersionedFile.get_parent."""
422
return map(self._idx_to_name, self._parents[self._lookup(version_id)])
385
424
def _check_repeated_add(self, name, parents, text, sha1):
386
425
"""Check that a duplicated add is OK.
393
432
raise RevisionAlreadyPresent(name, self._weave_name)
396
def _add_lines(self, version_id, parents, lines, parent_texts,
397
left_matching_blocks, nostore_sha, random_id, check_content):
435
@deprecated_method(zero_eight)
436
def add_identical(self, old_rev_id, new_rev_id, parents):
437
"""Please use Weave.clone_text now."""
438
return self.clone_text(new_rev_id, old_rev_id, parents)
440
def _add_lines(self, version_id, parents, lines, parent_texts):
398
441
"""See VersionedFile.add_lines."""
399
idx = self._add(version_id, lines, map(self._lookup, parents),
400
nostore_sha=nostore_sha)
401
return sha_strings(lines), sum(map(len, lines)), idx
403
def _add(self, version_id, lines, parents, sha1=None, nostore_sha=None):
442
return self._add(version_id, lines, map(self._lookup, parents))
444
@deprecated_method(zero_eight)
445
def add(self, name, parents, text, sha1=None):
446
"""See VersionedFile.add_lines for the non deprecated api."""
447
return self._add(name, text, map(self._maybe_lookup, parents), sha1)
449
def _add(self, version_id, lines, parents, sha1=None):
404
450
"""Add a single text on top of the weave.
406
452
Returns the index number of the newly added version.
409
455
Symbolic name for this version.
410
456
(Typically the revision-id of the revision that added it.)
411
If None, a name will be allocated based on the hash. (sha1:SHAHASH)
414
459
List or set of direct parent version numbers.
417
462
Sequence of lines to be added in the new version.
419
:param nostore_sha: See VersionedFile.add_lines.
421
self._check_lines_not_unicode(lines)
422
self._check_lines_are_lines(lines)
465
assert isinstance(version_id, basestring)
424
467
sha1 = sha_strings(lines)
425
if sha1 == nostore_sha:
426
raise errors.ExistingContent
427
if version_id is None:
428
version_id = "sha1:" + sha1
429
468
if version_id in self._name_map:
430
469
return self._check_repeated_add(version_id, parents, lines, sha1)
562
622
def _compatible_parents(self, my_parents, other_parents):
563
623
"""During join check that other_parents are joinable with my_parents.
565
Joinable is defined as 'is a subset of' - supersets may require
625
Joinable is defined as 'is a subset of' - supersets may require
566
626
regeneration of diffs, but subsets do not.
568
628
return len(other_parents.difference(my_parents)) == 0
570
630
def annotate(self, version_id):
571
"""Return a list of (version-id, line) tuples for version_id.
631
if isinstance(version_id, int):
632
warn('Weave.annotate(int) is deprecated. Please use version names'
633
' in all circumstances as of 0.8',
638
for origin, lineno, text in self._extract([version_id]):
639
result.append((origin, text))
642
return super(Weave, self).annotate(version_id)
644
def annotate_iter(self, version_id):
645
"""Yield list of (version-id, line) pairs for the specified version.
573
647
The index indicates when the line originated in the weave."""
574
648
incls = [self._lookup(version_id)]
575
return [(self._idx_to_name(origin), text) for origin, lineno, text in
576
self._extract(incls)]
578
def iter_lines_added_or_present_in_versions(self, version_ids=None,
649
for origin, lineno, text in self._extract(incls):
650
yield self._idx_to_name(origin), text
652
@deprecated_method(zero_eight)
654
"""_walk has become visit, a supported api."""
655
return self._walk_internal()
657
def iter_lines_added_or_present_in_versions(self, version_ids=None):
580
658
"""See VersionedFile.iter_lines_added_or_present_in_versions()."""
581
659
if version_ids is None:
582
660
version_ids = self.versions()
583
661
version_ids = set(version_ids)
584
662
for lineno, inserted, deletes, line in self._walk_internal(version_ids):
585
if inserted not in version_ids: continue
663
# if inserted not in version_ids then it was inserted before the
664
# versions we care about, but because weaves cannot represent ghosts
665
# properly, we do not filter down to that
666
# if inserted not in version_ids: continue
586
667
if line[-1] != '\n':
587
yield line + '\n', inserted
672
#@deprecated_method(zero_eight)
673
def walk(self, version_ids=None):
674
"""See VersionedFile.walk."""
675
return self._walk_internal(version_ids)
591
677
def _walk_internal(self, version_ids=None):
592
678
"""Helper method for weave actions."""
853
926
# no lines outside of insertion blocks, that deletions are
854
927
# properly paired, etc.
929
def _join(self, other, pb, msg, version_ids, ignore_missing):
930
"""Worker routine for join()."""
931
if not other.versions():
932
return # nothing to update, easy
935
for version_id in version_ids:
936
if not other.has_version(version_id) and not ignore_missing:
937
raise RevisionNotPresent(version_id, self._weave_name)
939
version_ids = other.versions()
941
# two loops so that we do not change ourselves before verifying it
943
# work through in index order to make sure we get all dependencies
946
# get the selected versions only that are in other.versions.
947
version_ids = set(other.versions()).intersection(set(version_ids))
948
# pull in the referenced graph.
949
version_ids = other.get_ancestry(version_ids)
950
pending_graph = [(version, other.get_parents(version)) for
951
version in version_ids]
952
for name in topo_sort(pending_graph):
953
other_idx = other._name_map[name]
954
# returns True if we have it, False if we need it.
955
if not self._check_version_consistent(other, other_idx, name):
956
names_to_join.append((other_idx, name))
965
for other_idx, name in names_to_join:
966
# TODO: If all the parents of the other version are already
967
# present then we can avoid some work by just taking the delta
968
# and adjusting the offsets.
969
new_parents = self._imported_parents(other, other_idx)
970
sha1 = other._sha1s[other_idx]
975
pb.update(msg, merged, len(names_to_join))
977
lines = other.get_lines(other_idx)
978
self._add(name, lines, new_parents, sha1)
980
mutter("merged = %d, processed = %d, file_id=%s; deltat=%d"%(
981
merged, processed, self._weave_name, time.time()-time0))
856
983
def _imported_parents(self, other, other_idx):
857
984
"""Return list of parents in self corresponding to indexes in other."""
956
1092
sio = StringIO()
957
1093
write_weave_v5(self, sio)
959
bytes = sio.getvalue()
960
path = self._weave_name + WeaveFile.WEAVE_SUFFIX
962
self._transport.put_bytes(path, bytes, self._filemode)
963
except errors.NoSuchFile:
964
self._transport.mkdir(dirname(path))
965
self._transport.put_bytes(path, bytes, self._filemode)
1095
self._transport.put(self._weave_name + WeaveFile.WEAVE_SUFFIX,
968
1100
def get_suffixes():
969
1101
"""See VersionedFile.get_suffixes()."""
970
1102
return [WeaveFile.WEAVE_SUFFIX]
972
def insert_record_stream(self, stream):
973
super(WeaveFile, self).insert_record_stream(stream)
1104
def join(self, other, pb=None, msg=None, version_ids=None,
1105
ignore_missing=False):
1106
"""Join other into self and save."""
1107
super(WeaveFile, self).join(other, pb, msg, version_ids, ignore_missing)
1111
@deprecated_function(zero_eight)
1112
def reweave(wa, wb, pb=None, msg=None):
1113
"""reweaving is deprecation, please just use weave.join()."""
1114
_reweave(wa, wb, pb, msg)
977
1116
def _reweave(wa, wb, pb=None, msg=None):
978
1117
"""Combine two weaves and return the result.
980
This works even if a revision R has different parents in
1119
This works even if a revision R has different parents in
981
1120
wa and wb. In the resulting weave all the parents are given.
983
This is done by just building up a new weave, maintaining ordering
1122
This is done by just building up a new weave, maintaining ordering
984
1123
of the versions in the two inputs. More efficient approaches
985
might be possible but it should only be necessary to do
986
this operation rarely, when a new previously ghost version is
1124
might be possible but it should only be necessary to do
1125
this operation rarely, when a new previously ghost version is
989
1128
:param pb: An optional progress bar, indicating how far done we are
1034
1172
p = combined.setdefault(name, set())
1035
1173
p.update(map(weave._idx_to_name, weave._parents[idx]))
1036
1174
return combined
1178
"""Show the weave's table-of-contents"""
1179
print '%6s %50s %10s %10s' % ('ver', 'name', 'sha1', 'parents')
1180
for i in (6, 50, 10, 10):
1183
for i in range(w.num_versions()):
1186
parent_str = ' '.join(map(str, w._parents[i]))
1187
print '%6d %-50.50s %10.10s %s' % (i, name, sha1, parent_str)
1191
def weave_stats(weave_file, pb):
1192
from bzrlib.weavefile import read_weave
1194
wf = file(weave_file, 'rb')
1195
w = read_weave(wf, WeaveVersionedFile)
1196
# FIXME: doesn't work on pipes
1197
weave_size = wf.tell()
1201
for i in range(vers):
1202
pb.update('checking sizes', i, vers)
1203
for origin, lineno, line in w._extract([i]):
1208
print 'versions %9d' % vers
1209
print 'weave file %9d bytes' % weave_size
1210
print 'total contents %9d bytes' % total
1211
print 'compression ratio %9.2fx' % (float(total) / float(weave_size))
1214
print 'average size %9d bytes' % avg
1215
print 'relative size %9.2fx' % (float(weave_size) / float(avg))
1219
print """bzr weave tool
1221
Experimental tool for weave algorithm.
1224
weave init WEAVEFILE
1225
Create an empty weave file
1226
weave get WEAVEFILE VERSION
1227
Write out specified version.
1228
weave check WEAVEFILE
1229
Check consistency of all versions.
1231
Display table of contents.
1232
weave add WEAVEFILE NAME [BASE...] < NEWTEXT
1233
Add NEWTEXT, with specified parent versions.
1234
weave annotate WEAVEFILE VERSION
1235
Display origin of each line.
1236
weave merge WEAVEFILE VERSION1 VERSION2 > OUT
1237
Auto-merge two versions and display conflicts.
1238
weave diff WEAVEFILE VERSION1 VERSION2
1239
Show differences between two versions.
1243
% weave init foo.weave
1245
% weave add foo.weave ver0 < foo.txt
1248
(create updated version)
1250
% weave get foo.weave 0 | diff -u - foo.txt
1251
% weave add foo.weave ver1 0 < foo.txt
1254
% weave get foo.weave 0 > foo.txt (create forked version)
1256
% weave add foo.weave ver2 0 < foo.txt
1259
% weave merge foo.weave 1 2 > foo.txt (merge them)
1260
% vi foo.txt (resolve conflicts)
1261
% weave add foo.weave merged 1 2 < foo.txt (commit merged version)
1273
# in case we're run directly from the subdirectory
1274
sys.path.append('..')
1276
from bzrlib.weavefile import write_weave, read_weave
1277
from bzrlib.progress import ProgressBar
1292
return read_weave(file(argv[2], 'rb'))
1298
# at the moment, based on everything in the file
1300
parents = map(int, argv[4:])
1301
lines = sys.stdin.readlines()
1302
ver = w.add(name, parents, lines)
1303
write_weave(w, file(argv[2], 'wb'))
1304
print 'added version %r %d' % (name, ver)
1307
if os.path.exists(fn):
1308
raise IOError("file exists")
1310
write_weave(w, file(fn, 'wb'))
1311
elif cmd == 'get': # get one version
1313
sys.stdout.writelines(w.get_iter(int(argv[3])))
1316
from difflib import unified_diff
1319
v1, v2 = map(int, argv[3:5])
1322
diff_gen = unified_diff(lines1, lines2,
1323
'%s version %d' % (fn, v1),
1324
'%s version %d' % (fn, v2))
1325
sys.stdout.writelines(diff_gen)
1327
elif cmd == 'annotate':
1329
# newline is added to all lines regardless; too hard to get
1330
# reasonable formatting otherwise
1332
for origin, text in w.annotate(int(argv[3])):
1333
text = text.rstrip('\r\n')
1335
print ' | %s' % (text)
1337
print '%5d | %s' % (origin, text)
1343
elif cmd == 'stats':
1344
weave_stats(argv[2], ProgressBar())
1346
elif cmd == 'check':
1351
print '%d versions ok' % w.num_versions()
1353
elif cmd == 'inclusions':
1355
print ' '.join(map(str, w.inclusions([int(argv[3])])))
1357
elif cmd == 'parents':
1359
print ' '.join(map(str, w._parents[int(argv[3])]))
1361
elif cmd == 'plan-merge':
1362
# replaced by 'bzr weave-plan-merge'
1364
for state, line in w.plan_merge(int(argv[3]), int(argv[4])):
1366
print '%14s | %s' % (state, line),
1367
elif cmd == 'merge':
1368
# replaced by 'bzr weave-merge-text'
1370
p = w.plan_merge(int(argv[3]), int(argv[4]))
1371
sys.stdout.writelines(w.weave_merge(p))
1373
raise ValueError('unknown command %r' % cmd)
1377
def profile_main(argv):
1378
import tempfile, hotshot, hotshot.stats
1380
prof_f = tempfile.NamedTemporaryFile()
1382
prof = hotshot.Profile(prof_f.name)
1384
ret = prof.runcall(main, argv)
1387
stats = hotshot.stats.load(prof_f.name)
1389
stats.sort_stats('cumulative')
1390
## XXX: Might like to write to stderr or the trace file instead but
1391
## print_stats seems hardcoded to stdout
1392
stats.print_stats(20)
1397
def lsprofile_main(argv):
1398
from bzrlib.lsprof import profile
1399
ret,stats = profile(main, argv)
1405
if __name__ == '__main__':
1407
if '--profile' in sys.argv:
1409
args.remove('--profile')
1410
sys.exit(profile_main(args))
1411
elif '--lsprof' in sys.argv:
1413
args.remove('--lsprof')
1414
sys.exit(lsprofile_main(args))
1416
sys.exit(main(sys.argv))
1419
class InterWeave(InterVersionedFile):
1420
"""Optimised code paths for weave to weave operations."""
1422
_matching_file_factory = staticmethod(WeaveFile)
1425
def is_compatible(source, target):
1426
"""Be compatible with weaves."""
1428
return (isinstance(source, Weave) and
1429
isinstance(target, Weave))
1430
except AttributeError:
1433
def join(self, pb=None, msg=None, version_ids=None, ignore_missing=False):
1434
"""See InterVersionedFile.join."""
1435
if self.target.versions() == []:
1437
self.target._copy_weave_content(self.source)
1440
self.target._join(self.source, pb, msg, version_ids, ignore_missing)
1441
except errors.WeaveParentMismatch:
1442
self.target._reweave(self.source, pb, msg)
1445
InterVersionedFile.register_optimiser(InterWeave)