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"""Weave - storage of related text file versions"""
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# before intset (r923) 2000 versions in 41.5s
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# with intset (r926) 2000 versions in 93s !!!
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# better to just use plain sets.
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# making _extract build and return a list, rather than being a generator
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# with python -O, r923 does 2000 versions in 36.87s
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# with optimizations to avoid mutating lists - 35.75! I guess copying
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# all the elements every time costs more than the small manipulations.
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# a surprisingly small change.
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# r931, which avoids using a generator for extract, does 36.98s
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# with memoized inclusions, takes 41.49s; not very good
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# with slots, takes 37.35s; without takes 39.16, a bit surprising
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# with the delta calculation mixed in with the add method, rather than
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# separated, takes 36.78s
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# with delta folded in and mutation of the list, 36.13s
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# with all this and simplification of add code, 33s
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# TODO: Perhaps have copy method for Weave instances?
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# XXX: If we do weaves this way, will a merge still behave the same
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# way if it's done in a different order? That's a pretty desirable
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# TODO: Parallel-extract that passes back each line along with a
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# description of which revisions include it. Nice for checking all
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class WeaveError(Exception):
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"""Exception in processing weave"""
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class WeaveFormatError(WeaveError):
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"""Weave invariant violated"""
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# shas or calculating stats in parallel.
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# TODO: Using a single _extract routine and then processing the output
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# is probably inefficient. It's simple enough that we can afford to
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# have slight specializations for different ways its used: annotate,
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# basis for add, get, etc.
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# TODO: Probably the API should work only in names to hide the integer
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# indexes from the user.
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# TODO: Is there any potential performance win by having an add()
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# variant that is passed a pre-cooked version of the single basis
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# TODO: Reweave can possibly be made faster by remembering diffs
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# where the basis and destination are unchanged.
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# FIXME: Sometimes we will be given a parents list for a revision
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# that includes some redundant parents (i.e. already a parent of
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# something in the list.) We should eliminate them. This can
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# be done fairly efficiently because the sequence numbers constrain
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# the possible relationships.
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from difflib import SequenceMatcher
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from bzrlib.trace import mutter
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from bzrlib.errors import WeaveError, WeaveFormatError, WeaveParentMismatch, \
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WeaveRevisionNotPresent, WeaveRevisionAlreadyPresent
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from bzrlib.tsort import topo_sort
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class Weave(object):
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"""weave - versioned text file storage.
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each version; the parent's parents are implied.
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List of hex SHA-1 of each version, or None if not recorded.
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List of hex SHA-1 of each version.
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List of symbolic names for each version. Each should be unique.
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For each name, the version number.
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Descriptive name of this weave; typically the filename if known.
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__slots__ = ['_weave', '_parents', '_sha1s']
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__slots__ = ['_weave', '_parents', '_sha1s', '_names', '_name_map',
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def __init__(self, weave_name=None):
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self._parents = []
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self._weave_name = weave_name
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return "Weave(%r)" % self._weave_name
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"""Return a deep copy of self.
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The copy can be modified without affecting the original weave."""
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other._weave = self._weave[:]
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other._parents = self._parents[:]
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other._sha1s = self._sha1s[:]
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other._names = self._names[:]
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other._name_map = self._name_map.copy()
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other._weave_name = self._weave_name
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def __eq__(self, other):
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if not isinstance(other, Weave):
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return self._parents == other._parents \
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and self._weave == other._weave
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and self._weave == other._weave \
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and self._sha1s == other._sha1s
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def __ne__(self, other):
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return not self.__eq__(other)
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def add(self, parents, text):
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def __contains__(self, name):
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return self._name_map.has_key(name)
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def maybe_lookup(self, name_or_index):
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"""Convert possible symbolic name to index, or pass through indexes."""
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if isinstance(name_or_index, (int, long)):
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return self.lookup(name_or_index)
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def lookup(self, name):
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"""Convert symbolic version name to index."""
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return self._name_map[name]
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raise WeaveRevisionNotPresent(name, self)
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return self._names[:]
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def iter_names(self):
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"""Yield a list of all names in this weave."""
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return iter(self._names)
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def idx_to_name(self, version):
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return self._names[version]
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def _check_repeated_add(self, name, parents, text, sha1):
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"""Check that a duplicated add is OK.
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If it is, return the (old) index; otherwise raise an exception.
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idx = self.lookup(name)
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if sorted(self._parents[idx]) != sorted(parents) \
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or sha1 != self._sha1s[idx]:
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raise WeaveRevisionAlreadyPresent(name, self)
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def add(self, name, parents, text, sha1=None):
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"""Add a single text on top of the weave.
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Returns the index number of the newly added version.
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Symbolic name for this version.
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(Typically the revision-id of the revision that added it.)
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List or set of direct parent version numbers.
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Sequence of lines to be added in the new version."""
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Sequence of lines to be added in the new version.
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sha -- SHA-1 of the file, if known. This is trusted to be
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from bzrlib.osutils import sha_strings
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assert isinstance(name, basestring)
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sha1 = sha_strings(text)
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if name in self._name_map:
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return self._check_repeated_add(name, parents, text, sha1)
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parents = map(self.maybe_lookup, parents)
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self._check_versions(parents)
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## self._check_lines(text)
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new_version = len(self._parents)
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# if we abort after here the weave will be corrupt
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self._parents.append(frozenset(parents))
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# if we abort after here the (in-memory) weave will be corrupt because only
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# some fields are updated
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self._parents.append(parents[:])
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self._sha1s.append(sha1)
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self._names.append(name)
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self._name_map[name] = new_version
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# we don't destroy ourselves
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self._weave[i:i] = ([('{', new_version)]
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+ [('}', new_version)])
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offset += 2 + (j2 - j1)
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return new_version
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def add_identical(self, old_rev_id, new_rev_id, parents):
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"""Add an identical text to old_rev_id as new_rev_id."""
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old_lines = self.get(self.lookup(old_rev_id))
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self.add(new_rev_id, parents, old_lines)
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def inclusions(self, versions):
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"""Return set of all ancestors of given version(s)."""
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i = set(versions)
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# include all its parents
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i.update(self._parents[v])
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raise ValueError("version %d not present in weave" % v)
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for v in xrange(max(versions), 0, -1):
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# include all its parents
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i.update(self._parents[v])
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## except IndexError:
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## raise ValueError("version %d not present in weave" % v)
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def parents(self, version):
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return self._parents[version]
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def parent_names(self, version):
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"""Return version names for parents of a version."""
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return map(self.idx_to_name, self._parents[self.lookup(version)])
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def minimal_parents(self, version):
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result.append((istack[-1], lineno, l))
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raise WFE("unclosed insertion blocks at end of weave",
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raise WeaveFormatError("unclosed insertion blocks "
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"at end of weave: %s" % istack)
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raise WFE("unclosed deletion blocks at end of weave",
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raise WeaveFormatError("unclosed deletion blocks at end of weave: %s"
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def get_iter(self, version):
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def get_iter(self, name_or_index):
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"""Yield lines for the specified version."""
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for origin, lineno, line in self._extract([version]):
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incls = [self.maybe_lookup(name_or_index)]
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for origin, lineno, line in self._extract(incls):
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def get(self, index):
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return list(self.get_iter(index))
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def get_text(self, name_or_index):
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return ''.join(self.get_iter(name_or_index))
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assert isinstance(version, int)
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def get_lines(self, name_or_index):
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return list(self.get_iter(name_or_index))
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def mash_iter(self, included):
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"""Return composed version of multiple included versions."""
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included = map(self.maybe_lookup, included)
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for origin, lineno, text in self._extract(included):
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"""Show some text information about the weave."""
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print '%6s %40s %20s' % ('ver', 'sha1', 'parents')
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for i in (6, 40, 20):
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def join(self, other):
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"""Integrate versions from other into this weave.
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The resulting weave contains all the history of both weaves;
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any version you could retrieve from either self or other can be
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retrieved from self after this call.
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It is illegal for the two weaves to contain different values
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or different parents for any version. See also reweave().
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if other.numversions() == 0:
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return # nothing to update, easy
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# two loops so that we do not change ourselves before verifying it
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# work through in index order to make sure we get all dependencies
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for other_idx, name in enumerate(other._names):
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if self._check_version_consistent(other, other_idx, name):
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for other_idx, name in enumerate(other._names):
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# TODO: If all the parents of the other version are already
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# present then we can avoid some work by just taking the delta
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# and adjusting the offsets.
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new_parents = self._imported_parents(other, other_idx)
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lines = other.get_lines(other_idx)
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sha1 = other._sha1s[other_idx]
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self.add(name, new_parents, lines, sha1)
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def _imported_parents(self, other, other_idx):
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"""Return list of parents in self corresponding to indexes in other."""
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for parent_idx in other._parents[other_idx]:
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parent_name = other._names[parent_idx]
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if parent_name not in self._names:
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# should not be possible
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raise WeaveError("missing parent {%s} of {%s} in %r"
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% (parent_name, other._name_map[other_idx], self))
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new_parents.append(self._name_map[parent_name])
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def _check_version_consistent(self, other, other_idx, name):
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"""Check if a version in consistent in this and other.
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To be consistent it must have:
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* the same direct parents (by name, not index, and disregarding
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If present & correct return True;
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if not present in self return False;
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if inconsistent raise error."""
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this_idx = self._name_map.get(name, -1)
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if self._sha1s[this_idx] != other._sha1s[other_idx]:
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raise WeaveError("inconsistent texts for version {%s} "
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"when joining weaves"
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self_parents = self._parents[this_idx]
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other_parents = other._parents[other_idx]
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n1 = [self._names[i] for i in self_parents]
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n2 = [other._names[i] for i in other_parents]
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raise WeaveParentMismatch("inconsistent parents "
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"for version {%s}: %s vs %s" % (name, n1, n2))
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def reweave(self, other):
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"""Reweave self with other."""
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new_weave = reweave(self, other)
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for attr in self.__slots__:
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setattr(self, attr, getattr(new_weave, attr))
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"""Combine two weaves and return the result.
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This works even if a revision R has different parents in
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wa and wb. In the resulting weave all the parents are given.
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This is done by just building up a new weave, maintaining ordering
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of the versions in the two inputs. More efficient approaches
847
might be possible but it should only be necessary to do
848
this operation rarely, when a new previously ghost version is
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queue_a = range(wa.numversions())
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queue_b = range(wb.numversions())
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# first determine combined parents of all versions
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# map from version name -> all parent names
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combined_parents = _reweave_parent_graphs(wa, wb)
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mutter("combined parents: %r", combined_parents)
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order = topo_sort(combined_parents.iteritems())
860
mutter("order to reweave: %r", order)
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if name in wa._name_map:
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lines = wa.get_lines(name)
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if name in wb._name_map:
865
assert lines == wb.get_lines(name)
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lines = wb.get_lines(name)
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wr.add(name, combined_parents[name], lines)
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def _reweave_parent_graphs(wa, wb):
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"""Return combined parent ancestry for two weaves.
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Returned as a list of (version_name, set(parent_names))"""
877
for weave in [wa, wb]:
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for idx, name in enumerate(weave._names):
879
p = combined.setdefault(name, set())
880
p.update(map(weave.idx_to_name, weave._parents[idx]))
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"""Show the weave's table-of-contents"""
886
print '%6s %50s %10s %10s' % ('ver', 'name', 'sha1', 'parents')
887
for i in (6, 50, 10, 10):
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for i in range(w.numversions()):
680
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sha1 = w._sha1s[i]
681
print '%6d %40s %s' % (i, sha1, ' '.join(map(str, w._parents[i])))
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def weave_stats(weave_file):
686
from bzrlib.progress import ProgressBar
893
parent_str = ' '.join(map(str, w._parents[i]))
894
print '%6d %-50.50s %10.10s %s' % (i, name, sha1, parent_str)
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def weave_stats(weave_file, pb):
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899
from bzrlib.weavefile import read_weave
691
901
wf = file(weave_file, 'rb')
692
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w = read_weave(wf)
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903
# FIXME: doesn't work on pipes
added
removed
bzrlib/weave.py
