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- Committer: Martin Pool
- Date: 2005-05-12 02:19:09 UTC
- Revision ID: mbp@sourcefrog.net-20050512021909-acb201f8ffc52b41
doc
- files added:
- bzrlib/statcache.py
- files removed:
- HACKING
- bzrlib/plugins
- bzrlib/selftest
- bzrlib/util
- bzrlib/util/effbot
- bzrlib/util/effbot/org
- contrib/emacs
- patches
- tools
- files renamed:
- contrib/bash/bzr.simple => contrib/bash/bzr
- bzrlib/util/elementtree/ => elementtree/
- bzrlib/util/urlgrabber/ => urlgrabber/
- files modified:
- .bzrignore
added
removed
bzrlib/weave.py
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#! /usr/bin/python
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# Copyright (C) 2005 Canonical Ltd
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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# Author: Martin Pool <mbp@canonical.com>
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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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# takes 37.94s
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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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# property.
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# TODO: Nothing here so far assumes the lines are really \n newlines,
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# rather than being split up in some other way. We could accomodate
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# binaries, perhaps by naively splitting on \n or perhaps using
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# something like a rolling checksum.
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# TODO: Track version names as well as indexes.
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# TODO: End marker for each version so we can stop reading?
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# TODO: Check that no insertion occurs inside a deletion that was
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# active in the version of the insertion.
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# TODO: In addition to the SHA-1 check, perhaps have some code that
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# checks structural constraints of the weave: ie that insertions are
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# properly nested, that there is no text outside of an insertion, that
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# insertions or deletions are not repeated, etc.
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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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# shas in parallel.
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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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class Weave(object):
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"""weave - versioned text file storage.
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A Weave manages versions of line-based text files, keeping track
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of the originating version for each line.
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To clients the "lines" of the file are represented as a list of strings.
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These strings will typically have terminal newline characters, but
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this is not required. In particular files commonly do not have a newline
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at the end of the file.
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Texts can be identified in either of two ways:
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* a nonnegative index number.
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* a version-id string.
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Typically the index number will be valid only inside this weave and
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the version-id is used to reference it in the larger world.
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The weave is represented as a list mixing edit instructions and
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literal text. Each entry in _weave can be either a string (or
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unicode), or a tuple. If a string, it means that the given line
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should be output in the currently active revisions.
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If a tuple, it gives a processing instruction saying in which
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revisions the enclosed lines are active. The tuple has the form
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(instruction, version).
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The instruction can be '{' or '}' for an insertion block, and '['
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and ']' for a deletion block respectively. The version is the
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integer version index. There is no replace operator, only deletes
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and inserts.
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Constraints/notes:
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* A later version can delete lines that were introduced by any
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number of ancestor versions; this implies that deletion
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instructions can span insertion blocks without regard to the
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insertion block's nesting.
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* Similarly, deletions need not be properly nested with regard to
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each other, because they might have been generated by
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independent revisions.
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* Insertions are always made by inserting a new bracketed block
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into a single point in the previous weave. This implies they
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can nest but not overlap, and the nesting must always have later
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insertions on the inside.
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* It doesn't seem very useful to have an active insertion
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inside an inactive insertion, but it might happen.
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* Therefore, all instructions are always"considered"; that
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is passed onto and off the stack. An outer inactive block
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doesn't disable an inner block.
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* Lines are enabled if the most recent enclosing insertion is
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active and none of the enclosing deletions are active.
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* There is no point having a deletion directly inside its own
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insertion; you might as well just not write it. And there
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should be no way to get an earlier version deleting a later
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version.
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_weave
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Text of the weave; list of control instruction tuples and strings.
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_parents
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List of parents, indexed by version number.
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It is only necessary to store the minimal set of parents for
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each version; the parent's parents are implied.
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_sha1s
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List of hex SHA-1 of each version, or None if not recorded.
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"""
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__slots__ = ['_weave', '_parents', '_sha1s']
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def __init__(self):
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self._weave = []
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self._parents = []
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self._sha1s = []
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def __eq__(self, other):
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if not isinstance(other, Weave):
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return False
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return self._parents == other._parents \
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and self._weave == other._weave
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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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"""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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parents
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List or set of direct parent version numbers.
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text
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Sequence of lines to be added in the new version."""
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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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import sha
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s = sha.new()
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map(s.update, text)
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sha1 = s.hexdigest()
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del s
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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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self._sha1s.append(sha1)
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if not parents:
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# special case; adding with no parents revision; can do
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# this more quickly by just appending unconditionally.
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# even more specially, if we're adding an empty text we
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# need do nothing at all.
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if text:
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self._weave.append(('{', new_version))
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self._weave.extend(text)
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self._weave.append(('}', new_version))
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return new_version
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if len(parents) == 1:
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pv = list(parents)[0]
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if sha1 == self._sha1s[pv]:
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# special case: same as the single parent
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return new_version
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ancestors = self.inclusions(parents)
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l = self._weave
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# basis a list of (origin, lineno, line)
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basis_lineno = []
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basis_lines = []
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for origin, lineno, line in self._extract(ancestors):
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basis_lineno.append(lineno)
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basis_lines.append(line)
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# another small special case: a merge, producing the same text
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# as auto-merge
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if text == basis_lines:
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return new_version
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# add a sentinal, because we can also match against the final line
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basis_lineno.append(len(self._weave))
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# XXX: which line of the weave should we really consider
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# matches the end of the file? the current code says it's the
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# last line of the weave?
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#print 'basis_lines:', basis_lines
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#print 'new_lines: ', lines
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from difflib import SequenceMatcher
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s = SequenceMatcher(None, basis_lines, text)
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# offset gives the number of lines that have been inserted
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# into the weave up to the current point; if the original edit instruction
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# says to change line A then we actually change (A+offset)
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offset = 0
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for tag, i1, i2, j1, j2 in s.get_opcodes():
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# i1,i2 are given in offsets within basis_lines; we need to map them
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# back to offsets within the entire weave
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#print 'raw match', tag, i1, i2, j1, j2
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if tag == 'equal':
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continue
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i1 = basis_lineno[i1]
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i2 = basis_lineno[i2]
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assert 0 <= j1 <= j2 <= len(text)
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#print tag, i1, i2, j1, j2
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# the deletion and insertion are handled separately.
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# first delete the region.
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if i1 != i2:
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self._weave.insert(i1+offset, ('[', new_version))
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self._weave.insert(i2+offset+1, (']', new_version))
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offset += 2
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if j1 != j2:
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# there may have been a deletion spanning up to
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# i2; we want to insert after this region to make sure
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# we don't destroy ourselves
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i = i2 + offset
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self._weave[i:i] = ([('{', new_version)]
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+ text[j1:j2]
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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 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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v = max(versions)
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try:
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while v >= 0:
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if v in i:
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# include all its parents
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i.update(self._parents[v])
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v -= 1
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return i
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except IndexError:
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raise ValueError("version %d not present in weave" % v)
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def minimal_parents(self, version):
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"""Find the minimal set of parents for the version."""
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included = self._parents[version]
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if not included:
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return []
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li = list(included)
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li.sort(reverse=True)
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mininc = []
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gotit = set()
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for pv in li:
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if pv not in gotit:
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mininc.append(pv)
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gotit.update(self.inclusions(pv))
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assert mininc[0] >= 0
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assert mininc[-1] < version
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return mininc
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def _check_lines(self, text):
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if not isinstance(text, list):
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raise ValueError("text should be a list, not %s" % type(text))
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for l in text:
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if not isinstance(l, basestring):
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raise ValueError("text line should be a string or unicode, not %s"
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% type(l))
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def _check_versions(self, indexes):
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"""Check everything in the sequence of indexes is valid"""
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for i in indexes:
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try:
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self._parents[i]
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except IndexError:
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raise IndexError("invalid version number %r" % i)
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def annotate(self, index):
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return list(self.annotate_iter(index))
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def annotate_iter(self, version):
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"""Yield list of (index-id, line) pairs for the specified version.
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The index indicates when the line originated in the weave."""
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for origin, lineno, text in self._extract([version]):
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yield origin, text
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def _walk(self):
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"""Walk the weave.
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Yields sequence of
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(lineno, insert, deletes, text)
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for each literal line.
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"""
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istack = []
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dset = set()
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lineno = 0 # line of weave, 0-based
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for l in self._weave:
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if isinstance(l, tuple):
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c, v = l
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isactive = None
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if c == '{':
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istack.append(v)
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elif c == '}':
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oldv = istack.pop()
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elif c == '[':
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assert v not in dset
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dset.add(v)
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elif c == ']':
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dset.remove(v)
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else:
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raise WeaveFormatError('unexpected instruction %r'
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% v)
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else:
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assert isinstance(l, basestring)
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assert istack
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yield lineno, istack[-1], dset, l
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lineno += 1
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def _extract(self, versions):
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"""Yield annotation of lines in included set.
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Yields a sequence of tuples (origin, lineno, text), where
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origin is the origin version, lineno the index in the weave,
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and text the text of the line.
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The set typically but not necessarily corresponds to a version.
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"""
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included = self.inclusions(versions)
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istack = []
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dset = set()
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lineno = 0 # line of weave, 0-based
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isactive = None
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result = []
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WFE = WeaveFormatError
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for l in self._weave:
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if isinstance(l, tuple):
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c, v = l
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isactive = None
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if c == '{':
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assert v not in istack
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istack.append(v)
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elif c == '}':
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oldv = istack.pop()
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assert oldv == v
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elif c == '[':
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if v in included:
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assert v not in dset
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dset.add(v)
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else:
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assert c == ']'
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if v in included:
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assert v in dset
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dset.remove(v)
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else:
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assert isinstance(l, basestring)
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if isactive is None:
449
isactive = (not dset) and istack and (istack[-1] in included)
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if isactive:
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result.append((istack[-1], lineno, l))
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lineno += 1
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if istack:
455
raise WFE("unclosed insertion blocks at end of weave",
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istack)
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if dset:
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raise WFE("unclosed deletion blocks at end of weave",
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dset)
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return result
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def get_iter(self, version):
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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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yield line
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def get(self, index):
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return list(self.get_iter(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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for origin, lineno, text in self._extract(included):
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yield text
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480
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def dump(self, to_file):
482
from pprint import pprint
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print >>to_file, "Weave._weave = ",
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pprint(self._weave, to_file)
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print >>to_file, "Weave._parents = ",
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pprint(self._parents, to_file)
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def numversions(self):
491
l = len(self._parents)
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assert l == len(self._sha1s)
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return l
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def __len__(self):
497
return self.numversions()
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def check(self, progress_bar=None):
501
# check no circular inclusions
502
for version in range(self.numversions()):
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inclusions = list(self._parents[version])
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if inclusions:
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inclusions.sort()
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if inclusions[-1] >= version:
507
raise WeaveFormatError("invalid included version %d for index %d"
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% (inclusions[-1], version))
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# try extracting all versions; this is a bit slow and parallel
511
# extraction could be used
512
import sha
513
nv = self.numversions()
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for version in range(nv):
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if progress_bar:
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progress_bar.update('checking text', version, nv)
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s = sha.new()
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for l in self.get_iter(version):
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s.update(l)
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hd = s.hexdigest()
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expected = self._sha1s[version]
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if hd != expected:
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raise WeaveError("mismatched sha1 for version %d; "
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"got %s, expected %s"
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% (version, hd, expected))
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# TODO: check insertions are properly nested, that there are
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# no lines outside of insertion blocks, that deletions are
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# properly paired, etc.
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532
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def merge(self, merge_versions):
534
"""Automerge and mark conflicts between versions.
535
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This returns a sequence, each entry describing alternatives
537
for a chunk of the file. Each of the alternatives is given as
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a list of lines.
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540
If there is a chunk of the file where there's no diagreement,
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only one alternative is given.
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"""
543
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# approach: find the included versions common to all the
545
# merged versions
546
raise NotImplementedError()
547
548
549
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def _delta(self, included, lines):
551
"""Return changes from basis to new revision.
552
553
The old text for comparison is the union of included revisions.
554
555
This is used in inserting a new text.
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557
Delta is returned as a sequence of
558
(weave1, weave2, newlines).
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This indicates that weave1:weave2 of the old weave should be
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replaced by the sequence of lines in newlines. Note that
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these line numbers are positions in the total weave and don't
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correspond to the lines in any extracted version, or even the
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extracted union of included versions.
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If line1=line2, this is a pure insert; if newlines=[] this is a
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pure delete. (Similar to difflib.)
568
"""
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571
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def plan_merge(self, ver_a, ver_b):
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"""Return pseudo-annotation indicating how the two versions merge.
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This is computed between versions a and b and their common
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base.
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Weave lines present in none of them are skipped entirely.
579
"""
580
inc_a = self.inclusions([ver_a])
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inc_b = self.inclusions([ver_b])
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inc_c = inc_a & inc_b
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584
for lineno, insert, deleteset, line in self._walk():
585
if deleteset & inc_c:
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# killed in parent; can't be in either a or b
587
# not relevant to our work
588
yield 'killed-base', line
589
elif insert in inc_c:
590
# was inserted in base
591
killed_a = bool(deleteset & inc_a)
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killed_b = bool(deleteset & inc_b)
593
if killed_a and killed_b:
594
yield 'killed-both', line
595
elif killed_a:
596
yield 'killed-a', line
597
elif killed_b:
598
yield 'killed-b', line
599
else:
600
yield 'unchanged', line
601
elif insert in inc_a:
602
if deleteset & inc_a:
603
yield 'ghost-a', line
604
else:
605
# new in A; not in B
606
yield 'new-a', line
607
elif insert in inc_b:
608
if deleteset & inc_b:
609
yield 'ghost-b', line
610
else:
611
yield 'new-b', line
612
else:
613
# not in either revision
614
yield 'irrelevant', line
615
616
yield 'unchanged', '' # terminator
617
618
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def weave_merge(self, plan):
621
lines_a = []
622
lines_b = []
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ch_a = ch_b = False
624
625
for state, line in plan:
626
if state == 'unchanged' or state == 'killed-both':
627
# resync and flush queued conflicts changes if any
628
if not lines_a and not lines_b:
629
pass
630
elif ch_a and not ch_b:
631
# one-sided change:
632
for l in lines_a: yield l
633
elif ch_b and not ch_a:
634
for l in lines_b: yield l
635
elif lines_a == lines_b:
636
for l in lines_a: yield l
637
else:
638
yield '<<<<\n'
639
for l in lines_a: yield l
640
yield '====\n'
641
for l in lines_b: yield l
642
yield '>>>>\n'
643
644
del lines_a[:]
645
del lines_b[:]
646
ch_a = ch_b = False
647
648
if state == 'unchanged':
649
if line:
650
yield line
651
elif state == 'killed-a':
652
ch_a = True
653
lines_b.append(line)
654
elif state == 'killed-b':
655
ch_b = True
656
lines_a.append(line)
657
elif state == 'new-a':
658
ch_a = True
659
lines_a.append(line)
660
elif state == 'new-b':
661
ch_b = True
662
lines_b.append(line)
663
else:
664
assert state in ('irrelevant', 'ghost-a', 'ghost-b', 'killed-base',
665
'killed-both'), \
666
state
667
668
669
670
671
672
673
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def weave_info(w):
675
"""Show some text information about the weave."""
676
print '%6s %40s %20s' % ('ver', 'sha1', 'parents')
677
for i in (6, 40, 20):
678
print '-' * i,
679
print
680
for i in range(w.numversions()):
681
sha1 = w._sha1s[i]
682
print '%6d %40s %s' % (i, sha1, ' '.join(map(str, w._parents[i])))
683
684
685
686
def weave_stats(weave_file):
687
from bzrlib.progress import ProgressBar
688
from bzrlib.weavefile import read_weave
689
690
pb = ProgressBar()
691
692
wf = file(weave_file, 'rb')
693
w = read_weave(wf)
694
# FIXME: doesn't work on pipes
695
weave_size = wf.tell()
696
697
total = 0
698
vers = len(w)
699
for i in range(vers):
700
pb.update('checking sizes', i, vers)
701
for line in w.get_iter(i):
702
total += len(line)
703
704
pb.clear()
705
706
print 'versions %9d' % vers
707
print 'weave file %9d bytes' % weave_size
708
print 'total contents %9d bytes' % total
709
print 'compression ratio %9.2fx' % (float(total) / float(weave_size))
710
if vers:
711
avg = total/vers
712
print 'average size %9d bytes' % avg
713
print 'relative size %9.2fx' % (float(weave_size) / float(avg))
714
715
716
def usage():
717
print """bzr weave tool
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719
Experimental tool for weave algorithm.
720
721
usage:
722
weave init WEAVEFILE
723
Create an empty weave file
724
weave get WEAVEFILE VERSION
725
Write out specified version.
726
weave check WEAVEFILE
727
Check consistency of all versions.
728
weave info WEAVEFILE
729
Display table of contents.
730
weave add WEAVEFILE [BASE...] < NEWTEXT
731
Add NEWTEXT, with specified parent versions.
732
weave annotate WEAVEFILE VERSION
733
Display origin of each line.
734
weave mash WEAVEFILE VERSION...
735
Display composite of all selected versions.
736
weave merge WEAVEFILE VERSION1 VERSION2 > OUT
737
Auto-merge two versions and display conflicts.
738
739
example:
740
741
% weave init foo.weave
742
% vi foo.txt
743
% weave add foo.weave < foo.txt
744
added version 0
745
746
(create updated version)
747
% vi foo.txt
748
% weave get foo.weave 0 | diff -u - foo.txt
749
% weave add foo.weave 0 < foo.txt
750
added version 1
751
752
% weave get foo.weave 0 > foo.txt (create forked version)
753
% vi foo.txt
754
% weave add foo.weave 0 < foo.txt
755
added version 2
756
757
% weave merge foo.weave 1 2 > foo.txt (merge them)
758
% vi foo.txt (resolve conflicts)
759
% weave add foo.weave 1 2 < foo.txt (commit merged version)
760
761
"""
762
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764
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def main(argv):
766
import sys
767
import os
768
from weavefile import write_weave, read_weave
769
from bzrlib.progress import ProgressBar
770
771
#import psyco
772
#psyco.full()
773
774
cmd = argv[1]
775
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def readit():
777
return read_weave(file(argv[2], 'rb'))
778
779
if cmd == 'help':
780
usage()
781
elif cmd == 'add':
782
w = readit()
783
# at the moment, based on everything in the file
784
parents = map(int, argv[3:])
785
lines = sys.stdin.readlines()
786
ver = w.add(parents, lines)
787
write_weave(w, file(argv[2], 'wb'))
788
print 'added version %d' % ver
789
elif cmd == 'init':
790
fn = argv[2]
791
if os.path.exists(fn):
792
raise IOError("file exists")
793
w = Weave()
794
write_weave(w, file(fn, 'wb'))
795
elif cmd == 'get': # get one version
796
w = readit()
797
sys.stdout.writelines(w.get_iter(int(argv[3])))
798
799
elif cmd == 'mash': # get composite
800
w = readit()
801
sys.stdout.writelines(w.mash_iter(map(int, argv[3:])))
802
803
elif cmd == 'annotate':
804
w = readit()
805
# newline is added to all lines regardless; too hard to get
806
# reasonable formatting otherwise
807
lasto = None
808
for origin, text in w.annotate(int(argv[3])):
809
text = text.rstrip('\r\n')
810
if origin == lasto:
811
print ' | %s' % (text)
812
else:
813
print '%5d | %s' % (origin, text)
814
lasto = origin
815
816
elif cmd == 'info':
817
weave_info(readit())
818
819
elif cmd == 'stats':
820
weave_stats(argv[2])
821
822
elif cmd == 'check':
823
w = readit()
824
pb = ProgressBar()
825
w.check(pb)
826
pb.clear()
827
print '%d versions ok' % w.numversions()
828
829
elif cmd == 'inclusions':
830
w = readit()
831
print ' '.join(map(str, w.inclusions([int(argv[3])])))
832
833
elif cmd == 'parents':
834
w = readit()
835
print ' '.join(map(str, w._parents[int(argv[3])]))
836
837
elif cmd == 'plan-merge':
838
w = readit()
839
for state, line in w.plan_merge(int(argv[3]), int(argv[4])):
840
if line:
841
print '%14s | %s' % (state, line),
842
843
elif cmd == 'merge':
844
w = readit()
845
p = w.plan_merge(int(argv[3]), int(argv[4]))
846
sys.stdout.writelines(w.weave_merge(p))
847
848
elif cmd == 'mash-merge':
849
if len(argv) != 5:
850
usage()
851
return 1
852
853
w = readit()
854
v1, v2 = map(int, argv[3:5])
855
856
basis = w.inclusions([v1]).intersection(w.inclusions([v2]))
857
858
base_lines = list(w.mash_iter(basis))
859
a_lines = list(w.get(v1))
860
b_lines = list(w.get(v2))
861
862
from bzrlib.merge3 import Merge3
863
m3 = Merge3(base_lines, a_lines, b_lines)
864
865
name_a = 'version %d' % v1
866
name_b = 'version %d' % v2
867
sys.stdout.writelines(m3.merge_lines(name_a=name_a, name_b=name_b))
868
else:
869
raise ValueError('unknown command %r' % cmd)
870
871
872
if __name__ == '__main__':
873
import sys
874
sys.exit(main(sys.argv))
Loggerhead is a web-based interface for Breezy
Version: 2.0.1