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# Copyright (C) 2005, 2006 Canonical Ltd
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# Written by Martin Pool.
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# Modified by Johan Rydberg <jrydberg@gnu.org>
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# Modified by Robert Collins <robert.collins@canonical.com>
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# Modified by Aaron Bentley <aaron.bentley@utoronto.ca>
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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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"""Knit versionedfile implementation.
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A knit is a versioned file implementation that supports efficient append only
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lifeless: the data file is made up of "delta records". each delta record has a delta header
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that contains; (1) a version id, (2) the size of the delta (in lines), and (3) the digest of
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the -expanded data- (ie, the delta applied to the parent). the delta also ends with a
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end-marker; simply "end VERSION"
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delta can be line or full contents.a
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... the 8's there are the index number of the annotation.
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version robertc@robertcollins.net-20051003014215-ee2990904cc4c7ad 7 c7d23b2a5bd6ca00e8e266cec0ec228158ee9f9e
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8 e.set('executable', 'yes')
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8 if elt.get('executable') == 'yes':
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8 ie.executable = True
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end robertc@robertcollins.net-20051003014215-ee2990904cc4c7ad
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09:33 < jrydberg> lifeless: each index is made up of a tuple of; version id, options, position, size, parents
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09:33 < jrydberg> lifeless: the parents are currently dictionary compressed
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09:33 < jrydberg> lifeless: (meaning it currently does not support ghosts)
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09:33 < lifeless> right
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09:33 < jrydberg> lifeless: the position and size is the range in the data file
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so the index sequence is the dictionary compressed sequence number used
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in the deltas to provide line annotation
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# 10:16 < lifeless> make partial index writes safe
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# 10:16 < lifeless> implement 'knit.check()' like weave.check()
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# 10:17 < lifeless> record known ghosts so we can detect when they are filled in rather than the current 'reweave
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# move sha1 out of the content so that join is faster at verifying parents
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# record content length ?
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from cStringIO import StringIO
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from itertools import izip, chain
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from bzrlib.errors import FileExists, NoSuchFile, KnitError, \
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InvalidRevisionId, KnitCorrupt, KnitHeaderError, \
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RevisionNotPresent, RevisionAlreadyPresent
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from bzrlib.tuned_gzip import GzipFile
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from bzrlib.trace import mutter
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from bzrlib.osutils import contains_whitespace, contains_linebreaks, \
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from bzrlib.symbol_versioning import DEPRECATED_PARAMETER, deprecated_passed
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from bzrlib.tsort import topo_sort
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from bzrlib.versionedfile import VersionedFile, InterVersionedFile
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# TODO: Split out code specific to this format into an associated object.
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# TODO: Can we put in some kind of value to check that the index and data
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# files belong together?
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# TODO: accommodate binaries, perhaps by storing a byte count
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# TODO: function to check whole file
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# TODO: atomically append data, then measure backwards from the cursor
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# position after writing to work out where it was located. we may need to
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# bypass python file buffering.
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DATA_SUFFIX = '.knit'
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INDEX_SUFFIX = '.kndx'
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class KnitContent(object):
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"""Content of a knit version to which deltas can be applied."""
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def __init__(self, lines):
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def annotate_iter(self):
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"""Yield tuples of (origin, text) for each content line."""
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for origin, text in self._lines:
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"""Return a list of (origin, text) tuples."""
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return list(self.annotate_iter())
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def line_delta_iter(self, new_lines):
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"""Generate line-based delta from this content to new_lines."""
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new_texts = [text for origin, text in new_lines._lines]
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old_texts = [text for origin, text in self._lines]
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s = KnitSequenceMatcher(None, old_texts, new_texts)
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for op in s.get_opcodes():
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# ofrom oto length data
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yield (op[1], op[2], op[4]-op[3], new_lines._lines[op[3]:op[4]])
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def line_delta(self, new_lines):
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return list(self.line_delta_iter(new_lines))
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return [text for origin, text in self._lines]
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return KnitContent(self._lines[:])
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class _KnitFactory(object):
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"""Base factory for creating content objects."""
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def make(self, lines, version):
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num_lines = len(lines)
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return KnitContent(zip([version] * num_lines, lines))
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class KnitAnnotateFactory(_KnitFactory):
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"""Factory for creating annotated Content objects."""
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def parse_fulltext(self, content, version):
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"""Convert fulltext to internal representation
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fulltext content is of the format
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revid(utf8) plaintext\n
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internal representation is of the format:
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decode_utf8 = cache_utf8.decode
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origin, text = line.split(' ', 1)
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lines.append((decode_utf8(origin), text))
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return KnitContent(lines)
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def parse_line_delta_iter(self, lines):
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for result_item in self.parse_line_delta[lines]:
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def parse_line_delta(self, lines, version):
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"""Convert a line based delta into internal representation.
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line delta is in the form of:
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intstart intend intcount
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revid(utf8) newline\n
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internal representation is
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(start, end, count, [1..count tuples (revid, newline)])
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decode_utf8 = cache_utf8.decode
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# walk through the lines parsing.
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start, end, count = [int(n) for n in header.split(',')]
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origin, text = next().split(' ', 1)
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contents.append((decode_utf8(origin), text))
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result.append((start, end, count, contents))
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def lower_fulltext(self, content):
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"""convert a fulltext content record into a serializable form.
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see parse_fulltext which this inverts.
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encode_utf8 = cache_utf8.encode
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return ['%s %s' % (encode_utf8(o), t) for o, t in content._lines]
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def lower_line_delta(self, delta):
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"""convert a delta into a serializable form.
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See parse_line_delta which this inverts.
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encode_utf8 = cache_utf8.encode
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for start, end, c, lines in delta:
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out.append('%d,%d,%d\n' % (start, end, c))
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out.extend(encode_utf8(origin) + ' ' + text
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for origin, text in lines)
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class KnitPlainFactory(_KnitFactory):
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"""Factory for creating plain Content objects."""
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def parse_fulltext(self, content, version):
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"""This parses an unannotated fulltext.
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Note that this is not a noop - the internal representation
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has (versionid, line) - its just a constant versionid.
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return self.make(content, version)
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def parse_line_delta_iter(self, lines, version):
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header = lines.pop(0)
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start, end, c = [int(n) for n in header.split(',')]
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yield start, end, c, zip([version] * c, lines[:c])
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def parse_line_delta(self, lines, version):
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return list(self.parse_line_delta_iter(lines, version))
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def lower_fulltext(self, content):
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return content.text()
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def lower_line_delta(self, delta):
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for start, end, c, lines in delta:
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out.append('%d,%d,%d\n' % (start, end, c))
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out.extend([text for origin, text in lines])
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def make_empty_knit(transport, relpath):
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"""Construct a empty knit at the specified location."""
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k = KnitVersionedFile(transport, relpath, 'w', KnitPlainFactory)
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class KnitVersionedFile(VersionedFile):
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"""Weave-like structure with faster random access.
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A knit stores a number of texts and a summary of the relationships
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between them. Texts are identified by a string version-id. Texts
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are normally stored and retrieved as a series of lines, but can
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also be passed as single strings.
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Lines are stored with the trailing newline (if any) included, to
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avoid special cases for files with no final newline. Lines are
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composed of 8-bit characters, not unicode. The combination of
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these approaches should mean any 'binary' file can be safely
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stored and retrieved.
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def __init__(self, relpath, transport, file_mode=None, access_mode=None,
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factory=None, basis_knit=DEPRECATED_PARAMETER, delta=True,
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create=False, create_parent_dir=False, delay_create=False,
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"""Construct a knit at location specified by relpath.
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:param create: If not True, only open an existing knit.
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:param create_parent_dir: If True, create the parent directory if
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creating the file fails. (This is used for stores with
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hash-prefixes that may not exist yet)
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:param delay_create: The calling code is aware that the knit won't
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actually be created until the first data is stored.
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if deprecated_passed(basis_knit):
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warnings.warn("KnitVersionedFile.__(): The basis_knit parameter is"
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" deprecated as of bzr 0.9.",
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DeprecationWarning, stacklevel=2)
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if access_mode is None:
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super(KnitVersionedFile, self).__init__(access_mode)
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assert access_mode in ('r', 'w'), "invalid mode specified %r" % access_mode
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self.transport = transport
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self.filename = relpath
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self.factory = factory or KnitAnnotateFactory()
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self.writable = (access_mode == 'w')
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self._index = _KnitIndex(transport, relpath + INDEX_SUFFIX,
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access_mode, create=create, file_mode=file_mode,
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create_parent_dir=create_parent_dir, delay_create=delay_create,
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self._data = _KnitData(transport, relpath + DATA_SUFFIX,
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access_mode, create=create and not len(self), file_mode=file_mode,
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create_parent_dir=create_parent_dir, delay_create=delay_create,
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return '%s(%s)' % (self.__class__.__name__,
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self.transport.abspath(self.filename))
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def _add_delta(self, version_id, parents, delta_parent, sha1, noeol, delta):
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"""See VersionedFile._add_delta()."""
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self._check_add(version_id, []) # should we check the lines ?
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self._check_versions_present(parents)
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for parent in parents:
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if not self.has_version(parent):
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ghosts.append(parent)
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present_parents.append(parent)
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if delta_parent is None:
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# reconstitute as full text.
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assert len(delta) == 1 or len(delta) == 0
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assert delta[0][0] == 0
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assert delta[0][1] == 0, delta[0][1]
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return super(KnitVersionedFile, self)._add_delta(version_id,
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options.append('no-eol')
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if delta_parent is not None:
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# determine the current delta chain length.
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# To speed the extract of texts the delta chain is limited
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# to a fixed number of deltas. This should minimize both
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# I/O and the time spend applying deltas.
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delta_parents = [delta_parent]
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parent = delta_parents[0]
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method = self._index.get_method(parent)
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if method == 'fulltext':
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delta_parents = self._index.get_parents(parent)
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if method == 'line-delta':
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# did not find a fulltext in the delta limit.
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# just do a normal insertion.
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return super(KnitVersionedFile, self)._add_delta(version_id,
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options.append('line-delta')
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store_lines = self.factory.lower_line_delta(delta)
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where, size = self._data.add_record(version_id, digest, store_lines)
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self._index.add_version(version_id, options, where, size, parents)
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def _add_raw_records(self, records, data):
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"""Add all the records 'records' with data pre-joined in 'data'.
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:param records: A list of tuples(version_id, options, parents, size).
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:param data: The data for the records. When it is written, the records
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are adjusted to have pos pointing into data by the sum of
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the preceding records sizes.
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pos = self._data.add_raw_record(data)
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for (version_id, options, parents, size) in records:
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index_entries.append((version_id, options, pos+offset,
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if self._data._do_cache:
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self._data._cache[version_id] = data[offset:offset+size]
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self._index.add_versions(index_entries)
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def enable_cache(self):
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"""Start caching data for this knit"""
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self._data.enable_cache()
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def clear_cache(self):
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"""Clear the data cache only."""
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self._data.clear_cache()
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def copy_to(self, name, transport):
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"""See VersionedFile.copy_to()."""
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# copy the current index to a temp index to avoid racing with local
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transport.put_file_non_atomic(name + INDEX_SUFFIX + '.tmp',
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self.transport.get(self._index._filename))
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f = self._data._open_file()
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transport.put_file(name + DATA_SUFFIX, f)
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# move the copied index into place
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transport.move(name + INDEX_SUFFIX + '.tmp', name + INDEX_SUFFIX)
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def create_empty(self, name, transport, mode=None):
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return KnitVersionedFile(name, transport, factory=self.factory,
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delta=self.delta, create=True)
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def _fix_parents(self, version, new_parents):
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"""Fix the parents list for version.
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This is done by appending a new version to the index
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with identical data except for the parents list.
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the parents list must be a superset of the current
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current_values = self._index._cache[version]
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assert set(current_values[4]).difference(set(new_parents)) == set()
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self._index.add_version(version,
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def get_delta(self, version_id):
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"""Get a delta for constructing version from some other version."""
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if not self.has_version(version_id):
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raise RevisionNotPresent(version_id, self.filename)
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parents = self.get_parents(version_id)
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data_pos, data_size = self._index.get_position(version_id)
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data, sha1 = self._data.read_records(((version_id, data_pos, data_size),))[version_id]
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version_idx = self._index.lookup(version_id)
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noeol = 'no-eol' in self._index.get_options(version_id)
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if 'fulltext' == self._index.get_method(version_id):
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new_content = self.factory.parse_fulltext(data, version_idx)
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if parent is not None:
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reference_content = self._get_content(parent)
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old_texts = reference_content.text()
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new_texts = new_content.text()
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delta_seq = KnitSequenceMatcher(None, old_texts, new_texts)
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return parent, sha1, noeol, self._make_line_delta(delta_seq, new_content)
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delta = self.factory.parse_line_delta(data, version_idx)
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return parent, sha1, noeol, delta
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def get_graph_with_ghosts(self):
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"""See VersionedFile.get_graph_with_ghosts()."""
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graph_items = self._index.get_graph()
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return dict(graph_items)
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def get_sha1(self, version_id):
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"""See VersionedFile.get_sha1()."""
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record_map = self._get_record_map([version_id])
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method, content, digest, next = record_map[version_id]
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"""See VersionedFile.get_suffixes()."""
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return [DATA_SUFFIX, INDEX_SUFFIX]
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def has_ghost(self, version_id):
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"""True if there is a ghost reference in the file to version_id."""
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if self.has_version(version_id):
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# optimisable if needed by memoising the _ghosts set.
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items = self._index.get_graph()
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for node, parents in items:
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for parent in parents:
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if parent not in self._index._cache:
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if parent == version_id:
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"""See VersionedFile.versions."""
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return self._index.get_versions()
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def has_version(self, version_id):
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"""See VersionedFile.has_version."""
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return self._index.has_version(version_id)
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__contains__ = has_version
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def _merge_annotations(self, content, parents, parent_texts={},
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delta=None, annotated=None):
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"""Merge annotations for content. This is done by comparing
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the annotations based on changed to the text.
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for parent_id in parents:
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merge_content = self._get_content(parent_id, parent_texts)
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seq = KnitSequenceMatcher(None, merge_content.text(), content.text())
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if delta_seq is None:
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# setup a delta seq to reuse.
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for i, j, n in seq.get_matching_blocks():
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# this appears to copy (origin, text) pairs across to the new
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# content for any line that matches the last-checked parent.
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# FIXME: save the sequence control data for delta compression
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# against the most relevant parent rather than rediffing.
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content._lines[j:j+n] = merge_content._lines[i:i+n]
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reference_content = self._get_content(parents[0], parent_texts)
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new_texts = content.text()
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old_texts = reference_content.text()
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delta_seq = KnitSequenceMatcher(None, old_texts, new_texts)
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return self._make_line_delta(delta_seq, content)
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def _make_line_delta(self, delta_seq, new_content):
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"""Generate a line delta from delta_seq and new_content."""
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for op in delta_seq.get_opcodes():
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diff_hunks.append((op[1], op[2], op[4]-op[3], new_content._lines[op[3]:op[4]]))
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def _get_components_positions(self, version_ids):
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"""Produce a map of position data for the components of versions.
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This data is intended to be used for retrieving the knit records.
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A dict of version_id to (method, data_pos, data_size, next) is
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method is the way referenced data should be applied.
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data_pos is the position of the data in the knit.
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data_size is the size of the data in the knit.
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next is the build-parent of the version, or None for fulltexts.
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for version_id in version_ids:
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while cursor is not None and cursor not in component_data:
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method = self._index.get_method(cursor)
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if method == 'fulltext':
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next = self.get_parents(cursor)[0]
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data_pos, data_size = self._index.get_position(cursor)
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component_data[cursor] = (method, data_pos, data_size, next)
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return component_data
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def _get_content(self, version_id, parent_texts={}):
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"""Returns a content object that makes up the specified
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if not self.has_version(version_id):
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raise RevisionNotPresent(version_id, self.filename)
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cached_version = parent_texts.get(version_id, None)
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if cached_version is not None:
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return cached_version
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text_map, contents_map = self._get_content_maps([version_id])
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return contents_map[version_id]
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def _check_versions_present(self, version_ids):
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"""Check that all specified versions are present."""
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version_ids = set(version_ids)
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for r in list(version_ids):
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if self._index.has_version(r):
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version_ids.remove(r)
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raise RevisionNotPresent(list(version_ids)[0], self.filename)
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def _add_lines_with_ghosts(self, version_id, parents, lines, parent_texts):
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"""See VersionedFile.add_lines_with_ghosts()."""
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self._check_add(version_id, lines)
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return self._add(version_id, lines[:], parents, self.delta, parent_texts)
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def _add_lines(self, version_id, parents, lines, parent_texts):
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"""See VersionedFile.add_lines."""
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self._check_add(version_id, lines)
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self._check_versions_present(parents)
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return self._add(version_id, lines[:], parents, self.delta, parent_texts)
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def _check_add(self, version_id, lines):
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"""check that version_id and lines are safe to add."""
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assert self.writable, "knit is not opened for write"
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### FIXME escape. RBC 20060228
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if contains_whitespace(version_id):
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raise InvalidRevisionId(version_id, self.filename)
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if self.has_version(version_id):
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raise RevisionAlreadyPresent(version_id, self.filename)
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self._check_lines_not_unicode(lines)
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self._check_lines_are_lines(lines)
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def _add(self, version_id, lines, parents, delta, parent_texts):
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"""Add a set of lines on top of version specified by parents.
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If delta is true, compress the text as a line-delta against
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Any versions not present will be converted into ghosts.
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# 461 0 6546.0390 43.9100 bzrlib.knit:489(_add)
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# +400 0 889.4890 418.9790 +bzrlib.knit:192(lower_fulltext)
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# +461 0 1364.8070 108.8030 +bzrlib.knit:996(add_record)
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# +461 0 193.3940 41.5720 +bzrlib.knit:898(add_version)
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# +461 0 134.0590 18.3810 +bzrlib.osutils:361(sha_strings)
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# +461 0 36.3420 15.4540 +bzrlib.knit:146(make)
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# +1383 0 8.0370 8.0370 +<len>
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# +61 0 13.5770 7.9190 +bzrlib.knit:199(lower_line_delta)
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# +61 0 963.3470 7.8740 +bzrlib.knit:427(_get_content)
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# +61 0 973.9950 5.2950 +bzrlib.knit:136(line_delta)
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# +61 0 1918.1800 5.2640 +bzrlib.knit:359(_merge_annotations)
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if parent_texts is None:
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for parent in parents:
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if not self.has_version(parent):
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ghosts.append(parent)
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present_parents.append(parent)
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if delta and not len(present_parents):
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digest = sha_strings(lines)
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if lines[-1][-1] != '\n':
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options.append('no-eol')
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lines[-1] = lines[-1] + '\n'
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if len(present_parents) and delta:
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# To speed the extract of texts the delta chain is limited
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# to a fixed number of deltas. This should minimize both
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# I/O and the time spend applying deltas.
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delta_parents = present_parents
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parent = delta_parents[0]
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method = self._index.get_method(parent)
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if method == 'fulltext':
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delta_parents = self._index.get_parents(parent)
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if method == 'line-delta':
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lines = self.factory.make(lines, version_id)
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if delta or (self.factory.annotated and len(present_parents) > 0):
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# Merge annotations from parent texts if so is needed.
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delta_hunks = self._merge_annotations(lines, present_parents, parent_texts,
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delta, self.factory.annotated)
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options.append('line-delta')
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store_lines = self.factory.lower_line_delta(delta_hunks)
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options.append('fulltext')
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store_lines = self.factory.lower_fulltext(lines)
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where, size = self._data.add_record(version_id, digest, store_lines)
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self._index.add_version(version_id, options, where, size, parents)
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def check(self, progress_bar=None):
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"""See VersionedFile.check()."""
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def _clone_text(self, new_version_id, old_version_id, parents):
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"""See VersionedFile.clone_text()."""
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# FIXME RBC 20060228 make fast by only inserting an index with null
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self.add_lines(new_version_id, parents, self.get_lines(old_version_id))
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def get_lines(self, version_id):
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"""See VersionedFile.get_lines()."""
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return self.get_line_list([version_id])[0]
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def _get_record_map(self, version_ids):
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"""Produce a dictionary of knit records.
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The keys are version_ids, the values are tuples of (method, content,
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method is the way the content should be applied.
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content is a KnitContent object.
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digest is the SHA1 digest of this version id after all steps are done
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next is the build-parent of the version, i.e. the leftmost ancestor.
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If the method is fulltext, next will be None.
722
position_map = self._get_components_positions(version_ids)
723
# c = component_id, m = method, p = position, s = size, n = next
724
records = [(c, p, s) for c, (m, p, s, n) in position_map.iteritems()]
726
for component_id, content, digest in \
727
self._data.read_records_iter(records):
728
method, position, size, next = position_map[component_id]
729
record_map[component_id] = method, content, digest, next
733
def get_text(self, version_id):
734
"""See VersionedFile.get_text"""
735
return self.get_texts([version_id])[0]
737
def get_texts(self, version_ids):
738
return [''.join(l) for l in self.get_line_list(version_ids)]
740
def get_line_list(self, version_ids):
741
"""Return the texts of listed versions as a list of strings."""
742
text_map, content_map = self._get_content_maps(version_ids)
743
return [text_map[v] for v in version_ids]
745
def _get_content_maps(self, version_ids):
746
"""Produce maps of text and KnitContents
748
:return: (text_map, content_map) where text_map contains the texts for
749
the requested versions and content_map contains the KnitContents.
750
Both dicts take version_ids as their keys.
752
for version_id in version_ids:
753
if not self.has_version(version_id):
754
raise RevisionNotPresent(version_id, self.filename)
755
record_map = self._get_record_map(version_ids)
760
for version_id in version_ids:
763
while cursor is not None:
764
method, data, digest, next = record_map[cursor]
765
components.append((cursor, method, data, digest))
766
if cursor in content_map:
771
for component_id, method, data, digest in reversed(components):
772
if component_id in content_map:
773
content = content_map[component_id]
775
version_idx = self._index.lookup(component_id)
776
if method == 'fulltext':
777
assert content is None
778
content = self.factory.parse_fulltext(data, version_idx)
779
elif method == 'line-delta':
780
delta = self.factory.parse_line_delta(data[:],
782
content = content.copy()
783
content._lines = self._apply_delta(content._lines,
785
content_map[component_id] = content
787
if 'no-eol' in self._index.get_options(version_id):
788
content = content.copy()
789
line = content._lines[-1][1].rstrip('\n')
790
content._lines[-1] = (content._lines[-1][0], line)
791
final_content[version_id] = content
793
# digest here is the digest from the last applied component.
794
text = content.text()
795
if sha_strings(text) != digest:
796
raise KnitCorrupt(self.filename,
797
'sha-1 does not match %s' % version_id)
799
text_map[version_id] = text
800
return text_map, final_content
802
def iter_lines_added_or_present_in_versions(self, version_ids=None,
804
"""See VersionedFile.iter_lines_added_or_present_in_versions()."""
805
if version_ids is None:
806
version_ids = self.versions()
808
pb = progress.DummyProgress()
809
# we don't care about inclusions, the caller cares.
810
# but we need to setup a list of records to visit.
811
# we need version_id, position, length
812
version_id_records = []
813
requested_versions = list(version_ids)
814
# filter for available versions
815
for version_id in requested_versions:
816
if not self.has_version(version_id):
817
raise RevisionNotPresent(version_id, self.filename)
818
# get a in-component-order queue:
820
for version_id in self.versions():
821
if version_id in requested_versions:
822
version_ids.append(version_id)
823
data_pos, length = self._index.get_position(version_id)
824
version_id_records.append((version_id, data_pos, length))
827
total = len(version_id_records)
828
pb.update('Walking content.', count, total)
829
for version_id, data, sha_value in \
830
self._data.read_records_iter(version_id_records):
831
pb.update('Walking content.', count, total)
832
method = self._index.get_method(version_id)
833
version_idx = self._index.lookup(version_id)
834
assert method in ('fulltext', 'line-delta')
835
if method == 'fulltext':
836
content = self.factory.parse_fulltext(data, version_idx)
837
for line in content.text():
840
delta = self.factory.parse_line_delta(data, version_idx)
841
for start, end, count, lines in delta:
842
for origin, line in lines:
845
pb.update('Walking content.', total, total)
847
def num_versions(self):
848
"""See VersionedFile.num_versions()."""
849
return self._index.num_versions()
851
__len__ = num_versions
853
def annotate_iter(self, version_id):
854
"""See VersionedFile.annotate_iter."""
855
content = self._get_content(version_id)
856
for origin, text in content.annotate_iter():
859
def get_parents(self, version_id):
860
"""See VersionedFile.get_parents."""
863
# 52554 calls in 1264 872 internal down from 3674
865
return self._index.get_parents(version_id)
867
raise RevisionNotPresent(version_id, self.filename)
869
def get_parents_with_ghosts(self, version_id):
870
"""See VersionedFile.get_parents."""
872
return self._index.get_parents_with_ghosts(version_id)
874
raise RevisionNotPresent(version_id, self.filename)
876
def get_ancestry(self, versions):
877
"""See VersionedFile.get_ancestry."""
878
if isinstance(versions, basestring):
879
versions = [versions]
882
self._check_versions_present(versions)
883
return self._index.get_ancestry(versions)
885
def get_ancestry_with_ghosts(self, versions):
886
"""See VersionedFile.get_ancestry_with_ghosts."""
887
if isinstance(versions, basestring):
888
versions = [versions]
891
self._check_versions_present(versions)
892
return self._index.get_ancestry_with_ghosts(versions)
894
#@deprecated_method(zero_eight)
895
def walk(self, version_ids):
896
"""See VersionedFile.walk."""
897
# We take the short path here, and extract all relevant texts
898
# and put them in a weave and let that do all the work. Far
899
# from optimal, but is much simpler.
900
# FIXME RB 20060228 this really is inefficient!
901
from bzrlib.weave import Weave
903
w = Weave(self.filename)
904
ancestry = self.get_ancestry(version_ids)
905
sorted_graph = topo_sort(self._index.get_graph())
906
version_list = [vid for vid in sorted_graph if vid in ancestry]
908
for version_id in version_list:
909
lines = self.get_lines(version_id)
910
w.add_lines(version_id, self.get_parents(version_id), lines)
912
for lineno, insert_id, dset, line in w.walk(version_ids):
913
yield lineno, insert_id, dset, line
915
def plan_merge(self, ver_a, ver_b):
916
"""See VersionedFile.plan_merge."""
917
ancestors_b = set(self.get_ancestry(ver_b))
918
def status_a(revision, text):
919
if revision in ancestors_b:
920
return 'killed-b', text
924
ancestors_a = set(self.get_ancestry(ver_a))
925
def status_b(revision, text):
926
if revision in ancestors_a:
927
return 'killed-a', text
931
annotated_a = self.annotate(ver_a)
932
annotated_b = self.annotate(ver_b)
933
plain_a = [t for (a, t) in annotated_a]
934
plain_b = [t for (a, t) in annotated_b]
935
blocks = KnitSequenceMatcher(None, plain_a, plain_b).get_matching_blocks()
938
for ai, bi, l in blocks:
939
# process all mismatched sections
940
# (last mismatched section is handled because blocks always
941
# includes a 0-length last block)
942
for revision, text in annotated_a[a_cur:ai]:
943
yield status_a(revision, text)
944
for revision, text in annotated_b[b_cur:bi]:
945
yield status_b(revision, text)
947
# and now the matched section
950
for text_a, text_b in zip(plain_a[ai:a_cur], plain_b[bi:b_cur]):
951
assert text_a == text_b
952
yield "unchanged", text_a
955
class _KnitComponentFile(object):
956
"""One of the files used to implement a knit database"""
958
def __init__(self, transport, filename, mode, file_mode=None,
959
create_parent_dir=False, dir_mode=None):
960
self._transport = transport
961
self._filename = filename
963
self._file_mode = file_mode
964
self._dir_mode = dir_mode
965
self._create_parent_dir = create_parent_dir
966
self._need_to_create = False
968
def check_header(self, fp):
970
if line != self.HEADER:
971
raise KnitHeaderError(badline=line)
974
"""Commit is a nop."""
977
return '%s(%s)' % (self.__class__.__name__, self._filename)
980
class _KnitIndex(_KnitComponentFile):
981
"""Manages knit index file.
983
The index is already kept in memory and read on startup, to enable
984
fast lookups of revision information. The cursor of the index
985
file is always pointing to the end, making it easy to append
988
_cache is a cache for fast mapping from version id to a Index
991
_history is a cache for fast mapping from indexes to version ids.
993
The index data format is dictionary compressed when it comes to
994
parent references; a index entry may only have parents that with a
995
lover index number. As a result, the index is topological sorted.
997
Duplicate entries may be written to the index for a single version id
998
if this is done then the latter one completely replaces the former:
999
this allows updates to correct version and parent information.
1000
Note that the two entries may share the delta, and that successive
1001
annotations and references MUST point to the first entry.
1003
The index file on disc contains a header, followed by one line per knit
1004
record. The same revision can be present in an index file more than once.
1005
The first occurrence gets assigned a sequence number starting from 0.
1007
The format of a single line is
1008
REVISION_ID FLAGS BYTE_OFFSET LENGTH( PARENT_ID|PARENT_SEQUENCE_ID)* :\n
1009
REVISION_ID is a utf8-encoded revision id
1010
FLAGS is a comma separated list of flags about the record. Values include
1011
no-eol, line-delta, fulltext.
1012
BYTE_OFFSET is the ascii representation of the byte offset in the data file
1013
that the the compressed data starts at.
1014
LENGTH is the ascii representation of the length of the data file.
1015
PARENT_ID a utf-8 revision id prefixed by a '.' that is a parent of
1017
PARENT_SEQUENCE_ID the ascii representation of the sequence number of a
1018
revision id already in the knit that is a parent of REVISION_ID.
1019
The ' :' marker is the end of record marker.
1022
when a write is interrupted to the index file, it will result in a line that
1023
does not end in ' :'. If the ' :' is not present at the end of a line, or at
1024
the end of the file, then the record that is missing it will be ignored by
1027
When writing new records to the index file, the data is preceded by '\n'
1028
to ensure that records always start on new lines even if the last write was
1029
interrupted. As a result its normal for the last line in the index to be
1030
missing a trailing newline. One can be added with no harmful effects.
1033
HEADER = "# bzr knit index 8\n"
1035
# speed of knit parsing went from 280 ms to 280 ms with slots addition.
1036
# __slots__ = ['_cache', '_history', '_transport', '_filename']
1038
def _cache_version(self, version_id, options, pos, size, parents):
1039
"""Cache a version record in the history array and index cache.
1041
This is inlined into __init__ for performance. KEEP IN SYNC.
1042
(It saves 60ms, 25% of the __init__ overhead on local 4000 record
1045
# only want the _history index to reference the 1st index entry
1047
if version_id not in self._cache:
1048
index = len(self._history)
1049
self._history.append(version_id)
1051
index = self._cache[version_id][5]
1052
self._cache[version_id] = (version_id,
1059
def __init__(self, transport, filename, mode, create=False, file_mode=None,
1060
create_parent_dir=False, delay_create=False, dir_mode=None):
1061
_KnitComponentFile.__init__(self, transport, filename, mode,
1062
file_mode=file_mode,
1063
create_parent_dir=create_parent_dir,
1066
# position in _history is the 'official' index for a revision
1067
# but the values may have come from a newer entry.
1068
# so - wc -l of a knit index is != the number of unique names
1071
pb = bzrlib.ui.ui_factory.nested_progress_bar()
1076
pb.update('read knit index', count, total)
1077
fp = self._transport.get(self._filename)
1079
self.check_header(fp)
1080
# readlines reads the whole file at once:
1081
# bad for transports like http, good for local disk
1082
# we save 60 ms doing this one change (
1083
# from calling readline each time to calling
1085
# probably what we want for nice behaviour on
1086
# http is a incremental readlines that yields, or
1087
# a check for local vs non local indexes,
1088
for l in fp.readlines():
1090
if len(rec) < 5 or rec[-1] != ':':
1092
# FIXME: in the future we should determine if its a
1093
# short write - and ignore it
1094
# or a different failure, and raise. RBC 20060407
1098
#pb.update('read knit index', count, total)
1099
# See self._parse_parents
1101
for value in rec[4:-1]:
1103
# uncompressed reference
1104
parents.append(value[1:])
1106
# this is 15/4000ms faster than isinstance,
1108
# this function is called thousands of times a
1109
# second so small variations add up.
1110
assert value.__class__ is str
1111
parents.append(self._history[int(value)])
1112
# end self._parse_parents
1113
# self._cache_version(rec[0],
1114
# rec[1].split(','),
1118
# --- self._cache_version
1119
# only want the _history index to reference the 1st
1120
# index entry for version_id
1122
if version_id not in self._cache:
1123
index = len(self._history)
1124
self._history.append(version_id)
1126
index = self._cache[version_id][5]
1127
self._cache[version_id] = (version_id,
1133
# --- self._cache_version
1136
except NoSuchFile, e:
1137
if mode != 'w' or not create:
1140
self._need_to_create = True
1142
self._transport.put_bytes_non_atomic(self._filename,
1143
self.HEADER, mode=self._file_mode)
1146
pb.update('read knit index', total, total)
1149
def _parse_parents(self, compressed_parents):
1150
"""convert a list of string parent values into version ids.
1152
ints are looked up in the index.
1153
.FOO values are ghosts and converted in to FOO.
1155
NOTE: the function is retained here for clarity, and for possible
1156
use in partial index reads. However bulk processing now has
1157
it inlined in __init__ for inner-loop optimisation.
1160
for value in compressed_parents:
1161
if value[-1] == '.':
1162
# uncompressed reference
1163
result.append(value[1:])
1165
# this is 15/4000ms faster than isinstance,
1166
# this function is called thousands of times a
1167
# second so small variations add up.
1168
assert value.__class__ is str
1169
result.append(self._history[int(value)])
1172
def get_graph(self):
1174
for version_id, index in self._cache.iteritems():
1175
graph.append((version_id, index[4]))
1178
def get_ancestry(self, versions):
1179
"""See VersionedFile.get_ancestry."""
1180
# get a graph of all the mentioned versions:
1182
pending = set(versions)
1184
version = pending.pop()
1185
parents = self._cache[version][4]
1186
# got the parents ok
1188
parents = [parent for parent in parents if parent in self._cache]
1189
for parent in parents:
1190
# if not completed and not a ghost
1191
if parent not in graph:
1193
graph[version] = parents
1194
return topo_sort(graph.items())
1196
def get_ancestry_with_ghosts(self, versions):
1197
"""See VersionedFile.get_ancestry_with_ghosts."""
1198
# get a graph of all the mentioned versions:
1200
pending = set(versions)
1202
version = pending.pop()
1204
parents = self._cache[version][4]
1210
# got the parents ok
1211
for parent in parents:
1212
if parent not in graph:
1214
graph[version] = parents
1215
return topo_sort(graph.items())
1217
def num_versions(self):
1218
return len(self._history)
1220
__len__ = num_versions
1222
def get_versions(self):
1223
return self._history
1225
def idx_to_name(self, idx):
1226
return self._history[idx]
1228
def lookup(self, version_id):
1229
assert version_id in self._cache
1230
return self._cache[version_id][5]
1232
def _version_list_to_index(self, versions):
1233
encode_utf8 = cache_utf8.encode
1235
for version in versions:
1236
if version in self._cache:
1237
# -- inlined lookup() --
1238
result_list.append(str(self._cache[version][5]))
1239
# -- end lookup () --
1241
result_list.append('.' + encode_utf8(version))
1242
return ' '.join(result_list)
1244
def add_version(self, version_id, options, pos, size, parents):
1245
"""Add a version record to the index."""
1246
self.add_versions(((version_id, options, pos, size, parents),))
1248
def add_versions(self, versions):
1249
"""Add multiple versions to the index.
1251
:param versions: a list of tuples:
1252
(version_id, options, pos, size, parents).
1255
encode_utf8 = cache_utf8.encode
1256
orig_history = self._history[:]
1257
orig_cache = self._cache.copy()
1260
for version_id, options, pos, size, parents in versions:
1261
line = "\n%s %s %s %s %s :" % (encode_utf8(version_id),
1265
self._version_list_to_index(parents))
1266
assert isinstance(line, str), \
1267
'content must be utf-8 encoded: %r' % (line,)
1269
self._cache_version(version_id, options, pos, size, parents)
1270
if not self._need_to_create:
1271
self._transport.append_bytes(self._filename, ''.join(lines))
1274
sio.write(self.HEADER)
1275
sio.writelines(lines)
1277
self._transport.put_file_non_atomic(self._filename, sio,
1278
create_parent_dir=self._create_parent_dir,
1279
mode=self._file_mode,
1280
dir_mode=self._dir_mode)
1281
self._need_to_create = False
1283
# If any problems happen, restore the original values and re-raise
1284
self._history = orig_history
1285
self._cache = orig_cache
1288
def has_version(self, version_id):
1289
"""True if the version is in the index."""
1290
return (version_id in self._cache)
1292
def get_position(self, version_id):
1293
"""Return data position and size of specified version."""
1294
return (self._cache[version_id][2], \
1295
self._cache[version_id][3])
1297
def get_method(self, version_id):
1298
"""Return compression method of specified version."""
1299
options = self._cache[version_id][1]
1300
if 'fulltext' in options:
1303
assert 'line-delta' in options
1306
def get_options(self, version_id):
1307
return self._cache[version_id][1]
1309
def get_parents(self, version_id):
1310
"""Return parents of specified version ignoring ghosts."""
1311
return [parent for parent in self._cache[version_id][4]
1312
if parent in self._cache]
1314
def get_parents_with_ghosts(self, version_id):
1315
"""Return parents of specified version with ghosts."""
1316
return self._cache[version_id][4]
1318
def check_versions_present(self, version_ids):
1319
"""Check that all specified versions are present."""
1320
version_ids = set(version_ids)
1321
for version_id in list(version_ids):
1322
if version_id in self._cache:
1323
version_ids.remove(version_id)
1325
raise RevisionNotPresent(list(version_ids)[0], self.filename)
1328
class _KnitData(_KnitComponentFile):
1329
"""Contents of the knit data file"""
1331
def __init__(self, transport, filename, mode, create=False, file_mode=None,
1332
create_parent_dir=False, delay_create=False,
1334
_KnitComponentFile.__init__(self, transport, filename, mode,
1335
file_mode=file_mode,
1336
create_parent_dir=create_parent_dir,
1338
self._checked = False
1339
# TODO: jam 20060713 conceptually, this could spill to disk
1340
# if the cached size gets larger than a certain amount
1341
# but it complicates the model a bit, so for now just use
1342
# a simple dictionary
1344
self._do_cache = False
1347
self._need_to_create = create
1349
self._transport.put_bytes_non_atomic(self._filename, '',
1350
mode=self._file_mode)
1352
def enable_cache(self):
1353
"""Enable caching of reads."""
1354
self._do_cache = True
1356
def clear_cache(self):
1357
"""Clear the record cache."""
1358
self._do_cache = False
1361
def _open_file(self):
1363
return self._transport.get(self._filename)
1368
def _record_to_data(self, version_id, digest, lines):
1369
"""Convert version_id, digest, lines into a raw data block.
1371
:return: (len, a StringIO instance with the raw data ready to read.)
1374
data_file = GzipFile(None, mode='wb', fileobj=sio)
1376
version_id_utf8 = cache_utf8.encode(version_id)
1377
data_file.writelines(chain(
1378
["version %s %d %s\n" % (version_id_utf8,
1382
["end %s\n" % version_id_utf8]))
1389
def add_raw_record(self, raw_data):
1390
"""Append a prepared record to the data file.
1392
:return: the offset in the data file raw_data was written.
1394
assert isinstance(raw_data, str), 'data must be plain bytes'
1395
if not self._need_to_create:
1396
return self._transport.append_bytes(self._filename, raw_data)
1398
self._transport.put_bytes_non_atomic(self._filename, raw_data,
1399
create_parent_dir=self._create_parent_dir,
1400
mode=self._file_mode,
1401
dir_mode=self._dir_mode)
1402
self._need_to_create = False
1405
def add_record(self, version_id, digest, lines):
1406
"""Write new text record to disk. Returns the position in the
1407
file where it was written."""
1408
size, sio = self._record_to_data(version_id, digest, lines)
1410
if not self._need_to_create:
1411
start_pos = self._transport.append_file(self._filename, sio)
1413
self._transport.put_file_non_atomic(self._filename, sio,
1414
create_parent_dir=self._create_parent_dir,
1415
mode=self._file_mode,
1416
dir_mode=self._dir_mode)
1417
self._need_to_create = False
1420
self._cache[version_id] = sio.getvalue()
1421
return start_pos, size
1423
def _parse_record_header(self, version_id, raw_data):
1424
"""Parse a record header for consistency.
1426
:return: the header and the decompressor stream.
1427
as (stream, header_record)
1429
df = GzipFile(mode='rb', fileobj=StringIO(raw_data))
1430
rec = df.readline().split()
1432
raise KnitCorrupt(self._filename, 'unexpected number of elements in record header')
1433
if cache_utf8.decode(rec[1]) != version_id:
1434
raise KnitCorrupt(self._filename,
1435
'unexpected version, wanted %r, got %r' % (
1436
version_id, rec[1]))
1439
def _parse_record(self, version_id, data):
1441
# 4168 calls in 2880 217 internal
1442
# 4168 calls to _parse_record_header in 2121
1443
# 4168 calls to readlines in 330
1444
df, rec = self._parse_record_header(version_id, data)
1445
record_contents = df.readlines()
1446
l = record_contents.pop()
1447
assert len(record_contents) == int(rec[2])
1448
if l != 'end %s\n' % cache_utf8.encode(version_id):
1449
raise KnitCorrupt(self._filename, 'unexpected version end line %r, wanted %r'
1452
return record_contents, rec[3]
1454
def read_records_iter_raw(self, records):
1455
"""Read text records from data file and yield raw data.
1457
This unpacks enough of the text record to validate the id is
1458
as expected but thats all.
1460
# setup an iterator of the external records:
1461
# uses readv so nice and fast we hope.
1463
# grab the disk data needed.
1465
# Don't check _cache if it is empty
1466
needed_offsets = [(pos, size) for version_id, pos, size
1468
if version_id not in self._cache]
1470
needed_offsets = [(pos, size) for version_id, pos, size
1473
raw_records = self._transport.readv(self._filename, needed_offsets)
1476
for version_id, pos, size in records:
1477
if version_id in self._cache:
1478
# This data has already been validated
1479
data = self._cache[version_id]
1481
pos, data = raw_records.next()
1483
self._cache[version_id] = data
1485
# validate the header
1486
df, rec = self._parse_record_header(version_id, data)
1488
yield version_id, data
1490
def read_records_iter(self, records):
1491
"""Read text records from data file and yield result.
1493
The result will be returned in whatever is the fastest to read.
1494
Not by the order requested. Also, multiple requests for the same
1495
record will only yield 1 response.
1496
:param records: A list of (version_id, pos, len) entries
1497
:return: Yields (version_id, contents, digest) in the order
1498
read, not the order requested
1504
# Skip records we have alread seen
1505
yielded_records = set()
1506
needed_records = set()
1507
for record in records:
1508
if record[0] in self._cache:
1509
if record[0] in yielded_records:
1511
yielded_records.add(record[0])
1512
data = self._cache[record[0]]
1513
content, digest = self._parse_record(record[0], data)
1514
yield (record[0], content, digest)
1516
needed_records.add(record)
1517
needed_records = sorted(needed_records, key=operator.itemgetter(1))
1519
needed_records = sorted(set(records), key=operator.itemgetter(1))
1521
if not needed_records:
1524
# The transport optimizes the fetching as well
1525
# (ie, reads continuous ranges.)
1526
readv_response = self._transport.readv(self._filename,
1527
[(pos, size) for version_id, pos, size in needed_records])
1529
for (version_id, pos, size), (pos, data) in \
1530
izip(iter(needed_records), readv_response):
1531
content, digest = self._parse_record(version_id, data)
1533
self._cache[version_id] = data
1534
yield version_id, content, digest
1536
def read_records(self, records):
1537
"""Read records into a dictionary."""
1539
for record_id, content, digest in \
1540
self.read_records_iter(records):
1541
components[record_id] = (content, digest)
1545
class InterKnit(InterVersionedFile):
1546
"""Optimised code paths for knit to knit operations."""
1548
_matching_file_from_factory = KnitVersionedFile
1549
_matching_file_to_factory = KnitVersionedFile
1552
def is_compatible(source, target):
1553
"""Be compatible with knits. """
1555
return (isinstance(source, KnitVersionedFile) and
1556
isinstance(target, KnitVersionedFile))
1557
except AttributeError:
1560
def join(self, pb=None, msg=None, version_ids=None, ignore_missing=False):
1561
"""See InterVersionedFile.join."""
1562
assert isinstance(self.source, KnitVersionedFile)
1563
assert isinstance(self.target, KnitVersionedFile)
1565
version_ids = self._get_source_version_ids(version_ids, ignore_missing)
1570
pb = bzrlib.ui.ui_factory.nested_progress_bar()
1572
version_ids = list(version_ids)
1573
if None in version_ids:
1574
version_ids.remove(None)
1576
self.source_ancestry = set(self.source.get_ancestry(version_ids))
1577
this_versions = set(self.target._index.get_versions())
1578
needed_versions = self.source_ancestry - this_versions
1579
cross_check_versions = self.source_ancestry.intersection(this_versions)
1580
mismatched_versions = set()
1581
for version in cross_check_versions:
1582
# scan to include needed parents.
1583
n1 = set(self.target.get_parents_with_ghosts(version))
1584
n2 = set(self.source.get_parents_with_ghosts(version))
1586
# FIXME TEST this check for cycles being introduced works
1587
# the logic is we have a cycle if in our graph we are an
1588
# ancestor of any of the n2 revisions.
1594
parent_ancestors = self.source.get_ancestry(parent)
1595
if version in parent_ancestors:
1596
raise errors.GraphCycleError([parent, version])
1597
# ensure this parent will be available later.
1598
new_parents = n2.difference(n1)
1599
needed_versions.update(new_parents.difference(this_versions))
1600
mismatched_versions.add(version)
1602
if not needed_versions and not mismatched_versions:
1604
full_list = topo_sort(self.source.get_graph())
1606
version_list = [i for i in full_list if (not self.target.has_version(i)
1607
and i in needed_versions)]
1611
copy_queue_records = []
1613
for version_id in version_list:
1614
options = self.source._index.get_options(version_id)
1615
parents = self.source._index.get_parents_with_ghosts(version_id)
1616
# check that its will be a consistent copy:
1617
for parent in parents:
1618
# if source has the parent, we must :
1619
# * already have it or
1620
# * have it scheduled already
1621
# otherwise we don't care
1622
assert (self.target.has_version(parent) or
1623
parent in copy_set or
1624
not self.source.has_version(parent))
1625
data_pos, data_size = self.source._index.get_position(version_id)
1626
copy_queue_records.append((version_id, data_pos, data_size))
1627
copy_queue.append((version_id, options, parents))
1628
copy_set.add(version_id)
1630
# data suck the join:
1632
total = len(version_list)
1635
for (version_id, raw_data), \
1636
(version_id2, options, parents) in \
1637
izip(self.source._data.read_records_iter_raw(copy_queue_records),
1639
assert version_id == version_id2, 'logic error, inconsistent results'
1641
pb.update("Joining knit", count, total)
1642
raw_records.append((version_id, options, parents, len(raw_data)))
1643
raw_datum.append(raw_data)
1644
self.target._add_raw_records(raw_records, ''.join(raw_datum))
1646
for version in mismatched_versions:
1647
# FIXME RBC 20060309 is this needed?
1648
n1 = set(self.target.get_parents_with_ghosts(version))
1649
n2 = set(self.source.get_parents_with_ghosts(version))
1650
# write a combined record to our history preserving the current
1651
# parents as first in the list
1652
new_parents = self.target.get_parents_with_ghosts(version) + list(n2.difference(n1))
1653
self.target.fix_parents(version, new_parents)
1659
InterVersionedFile.register_optimiser(InterKnit)
1662
class WeaveToKnit(InterVersionedFile):
1663
"""Optimised code paths for weave to knit operations."""
1665
_matching_file_from_factory = bzrlib.weave.WeaveFile
1666
_matching_file_to_factory = KnitVersionedFile
1669
def is_compatible(source, target):
1670
"""Be compatible with weaves to knits."""
1672
return (isinstance(source, bzrlib.weave.Weave) and
1673
isinstance(target, KnitVersionedFile))
1674
except AttributeError:
1677
def join(self, pb=None, msg=None, version_ids=None, ignore_missing=False):
1678
"""See InterVersionedFile.join."""
1679
assert isinstance(self.source, bzrlib.weave.Weave)
1680
assert isinstance(self.target, KnitVersionedFile)
1682
version_ids = self._get_source_version_ids(version_ids, ignore_missing)
1687
pb = bzrlib.ui.ui_factory.nested_progress_bar()
1689
version_ids = list(version_ids)
1691
self.source_ancestry = set(self.source.get_ancestry(version_ids))
1692
this_versions = set(self.target._index.get_versions())
1693
needed_versions = self.source_ancestry - this_versions
1694
cross_check_versions = self.source_ancestry.intersection(this_versions)
1695
mismatched_versions = set()
1696
for version in cross_check_versions:
1697
# scan to include needed parents.
1698
n1 = set(self.target.get_parents_with_ghosts(version))
1699
n2 = set(self.source.get_parents(version))
1700
# if all of n2's parents are in n1, then its fine.
1701
if n2.difference(n1):
1702
# FIXME TEST this check for cycles being introduced works
1703
# the logic is we have a cycle if in our graph we are an
1704
# ancestor of any of the n2 revisions.
1710
parent_ancestors = self.source.get_ancestry(parent)
1711
if version in parent_ancestors:
1712
raise errors.GraphCycleError([parent, version])
1713
# ensure this parent will be available later.
1714
new_parents = n2.difference(n1)
1715
needed_versions.update(new_parents.difference(this_versions))
1716
mismatched_versions.add(version)
1718
if not needed_versions and not mismatched_versions:
1720
full_list = topo_sort(self.source.get_graph())
1722
version_list = [i for i in full_list if (not self.target.has_version(i)
1723
and i in needed_versions)]
1727
total = len(version_list)
1728
for version_id in version_list:
1729
pb.update("Converting to knit", count, total)
1730
parents = self.source.get_parents(version_id)
1731
# check that its will be a consistent copy:
1732
for parent in parents:
1733
# if source has the parent, we must already have it
1734
assert (self.target.has_version(parent))
1735
self.target.add_lines(
1736
version_id, parents, self.source.get_lines(version_id))
1739
for version in mismatched_versions:
1740
# FIXME RBC 20060309 is this needed?
1741
n1 = set(self.target.get_parents_with_ghosts(version))
1742
n2 = set(self.source.get_parents(version))
1743
# write a combined record to our history preserving the current
1744
# parents as first in the list
1745
new_parents = self.target.get_parents_with_ghosts(version) + list(n2.difference(n1))
1746
self.target.fix_parents(version, new_parents)
1752
InterVersionedFile.register_optimiser(WeaveToKnit)
1755
class KnitSequenceMatcher(difflib.SequenceMatcher):
1756
"""Knit tuned sequence matcher.
1758
This is based on profiling of difflib which indicated some improvements
1759
for our usage pattern.
1762
def find_longest_match(self, alo, ahi, blo, bhi):
1763
"""Find longest matching block in a[alo:ahi] and b[blo:bhi].
1765
If isjunk is not defined:
1767
Return (i,j,k) such that a[i:i+k] is equal to b[j:j+k], where
1768
alo <= i <= i+k <= ahi
1769
blo <= j <= j+k <= bhi
1770
and for all (i',j',k') meeting those conditions,
1773
and if i == i', j <= j'
1775
In other words, of all maximal matching blocks, return one that
1776
starts earliest in a, and of all those maximal matching blocks that
1777
start earliest in a, return the one that starts earliest in b.
1779
>>> s = SequenceMatcher(None, " abcd", "abcd abcd")
1780
>>> s.find_longest_match(0, 5, 0, 9)
1783
If isjunk is defined, first the longest matching block is
1784
determined as above, but with the additional restriction that no
1785
junk element appears in the block. Then that block is extended as
1786
far as possible by matching (only) junk elements on both sides. So
1787
the resulting block never matches on junk except as identical junk
1788
happens to be adjacent to an "interesting" match.
1790
Here's the same example as before, but considering blanks to be
1791
junk. That prevents " abcd" from matching the " abcd" at the tail
1792
end of the second sequence directly. Instead only the "abcd" can
1793
match, and matches the leftmost "abcd" in the second sequence:
1795
>>> s = SequenceMatcher(lambda x: x==" ", " abcd", "abcd abcd")
1796
>>> s.find_longest_match(0, 5, 0, 9)
1799
If no blocks match, return (alo, blo, 0).
1801
>>> s = SequenceMatcher(None, "ab", "c")
1802
>>> s.find_longest_match(0, 2, 0, 1)
1806
# CAUTION: stripping common prefix or suffix would be incorrect.
1810
# Longest matching block is "ab", but if common prefix is
1811
# stripped, it's "a" (tied with "b"). UNIX(tm) diff does so
1812
# strip, so ends up claiming that ab is changed to acab by
1813
# inserting "ca" in the middle. That's minimal but unintuitive:
1814
# "it's obvious" that someone inserted "ac" at the front.
1815
# Windiff ends up at the same place as diff, but by pairing up
1816
# the unique 'b's and then matching the first two 'a's.
1818
a, b, b2j, isbjunk = self.a, self.b, self.b2j, self.isbjunk
1819
besti, bestj, bestsize = alo, blo, 0
1820
# find longest junk-free match
1821
# during an iteration of the loop, j2len[j] = length of longest
1822
# junk-free match ending with a[i-1] and b[j]
1826
for i in xrange(alo, ahi):
1827
# look at all instances of a[i] in b; note that because
1828
# b2j has no junk keys, the loop is skipped if a[i] is junk
1829
j2lenget = j2len.get
1832
# changing b2j.get(a[i], nothing) to a try:KeyError pair produced the
1833
# following improvement
1834
# 704 0 4650.5320 2620.7410 bzrlib.knit:1336(find_longest_match)
1835
# +326674 0 1655.1210 1655.1210 +<method 'get' of 'dict' objects>
1836
# +76519 0 374.6700 374.6700 +<method 'has_key' of 'dict' objects>
1838
# 704 0 3733.2820 2209.6520 bzrlib.knit:1336(find_longest_match)
1839
# +211400 0 1147.3520 1147.3520 +<method 'get' of 'dict' objects>
1840
# +76519 0 376.2780 376.2780 +<method 'has_key' of 'dict' objects>
1852
k = newj2len[j] = 1 + j2lenget(-1 + j, 0)
1854
besti, bestj, bestsize = 1 + i-k, 1 + j-k, k
1857
# Extend the best by non-junk elements on each end. In particular,
1858
# "popular" non-junk elements aren't in b2j, which greatly speeds
1859
# the inner loop above, but also means "the best" match so far
1860
# doesn't contain any junk *or* popular non-junk elements.
1861
while besti > alo and bestj > blo and \
1862
not isbjunk(b[bestj-1]) and \
1863
a[besti-1] == b[bestj-1]:
1864
besti, bestj, bestsize = besti-1, bestj-1, bestsize+1
1865
while besti+bestsize < ahi and bestj+bestsize < bhi and \
1866
not isbjunk(b[bestj+bestsize]) and \
1867
a[besti+bestsize] == b[bestj+bestsize]:
1870
# Now that we have a wholly interesting match (albeit possibly
1871
# empty!), we may as well suck up the matching junk on each
1872
# side of it too. Can't think of a good reason not to, and it
1873
# saves post-processing the (possibly considerable) expense of
1874
# figuring out what to do with it. In the case of an empty
1875
# interesting match, this is clearly the right thing to do,
1876
# because no other kind of match is possible in the regions.
1877
while besti > alo and bestj > blo and \
1878
isbjunk(b[bestj-1]) and \
1879
a[besti-1] == b[bestj-1]:
1880
besti, bestj, bestsize = besti-1, bestj-1, bestsize+1
1881
while besti+bestsize < ahi and bestj+bestsize < bhi and \
1882
isbjunk(b[bestj+bestsize]) and \
1883
a[besti+bestsize] == b[bestj+bestsize]:
1884
bestsize = bestsize + 1
1886
return besti, bestj, bestsize
added
removed
bzrlib/knit.py
