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# Copyright (C) 2005, 2006, 2007 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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"""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 (
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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 (
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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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return iter(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 = new_lines.text()
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old_texts = self.text()
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s = KnitSequenceMatcher(None, old_texts, new_texts)
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for tag, i1, i2, j1, j2 in s.get_opcodes():
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# ofrom, oto, length, data
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yield i1, i2, j2 - j1, new_lines._lines[j1:j2]
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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_id):
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num_lines = len(lines)
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return KnitContent(zip([version_id] * 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_id):
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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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# TODO: jam 20070209 The tests expect this to be returned as tuples,
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# but the code itself doesn't really depend on that.
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# Figure out a way to not require the overhead of turning the
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# list back into tuples.
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lines = [tuple(line.split(' ', 1)) for line in content]
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return KnitContent(lines)
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def parse_line_delta_iter(self, lines):
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return iter(self.parse_line_delta(lines))
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def parse_line_delta(self, lines, version_id):
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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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def cache_and_return(line):
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origin, text = line.split(' ', 1)
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return cache.setdefault(origin, origin), text
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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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contents = [tuple(next().split(' ', 1)) for i in xrange(count)]
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result.append((start, end, count, contents))
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def get_fulltext_content(self, lines):
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"""Extract just the content lines from a fulltext."""
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return (line.split(' ', 1)[1] for line in lines)
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def get_linedelta_content(self, lines):
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"""Extract just the content from a line delta.
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This doesn't return all of the extra information stored in a delta.
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Only the actual content lines.
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header = header.split(',')
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count = int(header[2])
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for i in xrange(count):
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origin, text = next().split(' ', 1)
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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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# TODO: jam 20070209 We only do the caching thing to make sure that
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# the origin is a valid utf-8 line, eventually we could remove it
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return ['%s %s' % (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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# TODO: jam 20070209 We only do the caching thing to make sure that
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# the origin is a valid utf-8 line, eventually we could remove it
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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(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_id):
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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_id)
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def parse_line_delta_iter(self, lines, version_id):
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num_lines = len(lines)
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while cur < num_lines:
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start, end, c = [int(n) for n in header.split(',')]
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yield start, end, c, zip([version_id] * c, lines[cur:cur+c])
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def parse_line_delta(self, lines, version_id):
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return list(self.parse_line_delta_iter(lines, version_id))
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def get_fulltext_content(self, lines):
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"""Extract just the content lines from a fulltext."""
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def get_linedelta_content(self, lines):
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"""Extract just the content from a line delta.
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This doesn't return all of the extra information stored in a delta.
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Only the actual content lines.
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header = header.split(',')
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count = int(header[2])
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for i in xrange(count):
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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._max_delta_chain = 200
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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 _check_should_delta(self, first_parents):
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"""Iterate back through the parent listing, looking for a fulltext.
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This is used when we want to decide whether to add a delta or a new
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fulltext. It searches for _max_delta_chain parents. When it finds a
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fulltext parent, it sees if the total size of the deltas leading up to
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it is large enough to indicate that we want a new full text anyway.
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Return True if we should create a new delta, False if we should use a
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delta_parents = first_parents
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for count in xrange(self._max_delta_chain):
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parent = delta_parents[0]
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method = self._index.get_method(parent)
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pos, size = self._index.get_position(parent)
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if method == 'fulltext':
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delta_parents = self._index.get_parents(parent)
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# We couldn't find a fulltext, so we must create a new one
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return fulltext_size > delta_size
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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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# The window was changed to a maximum of 200 deltas, but also added
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# was a check that the total compressed size of the deltas is
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# smaller than the compressed size of the fulltext.
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if not self._check_should_delta([delta_parent]):
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# We don't want a delta here, 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_id, 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_id]
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assert set(current_values[4]).difference(set(new_parents)) == set()
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self._index.add_version(version_id,
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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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version_id = osutils.safe_revision_id(version_id)
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self.check_not_reserved_id(version_id)
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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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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_id)
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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_id)
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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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version_id = osutils.safe_revision_id(version_id)
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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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version_id = osutils.safe_revision_id(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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version_id = osutils.safe_revision_id(version_id)
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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 = patiencediff.PatienceSequenceMatcher(
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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 = patiencediff.PatienceSequenceMatcher(
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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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self._index.check_versions_present(version_ids)
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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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self.check_not_reserved_id(version_id)
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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:
742
# To speed the extract of texts the delta chain is limited
743
# to a fixed number of deltas. This should minimize both
744
# I/O and the time spend applying deltas.
745
delta = self._check_should_delta(present_parents)
747
assert isinstance(version_id, str)
748
lines = self.factory.make(lines, version_id)
749
if delta or (self.factory.annotated and len(present_parents) > 0):
750
# Merge annotations from parent texts if so is needed.
751
delta_hunks = self._merge_annotations(lines, present_parents, parent_texts,
752
delta, self.factory.annotated)
755
options.append('line-delta')
756
store_lines = self.factory.lower_line_delta(delta_hunks)
758
options.append('fulltext')
759
store_lines = self.factory.lower_fulltext(lines)
761
where, size = self._data.add_record(version_id, digest, store_lines)
762
self._index.add_version(version_id, options, where, size, parents)
765
def check(self, progress_bar=None):
766
"""See VersionedFile.check()."""
768
def _clone_text(self, new_version_id, old_version_id, parents):
769
"""See VersionedFile.clone_text()."""
770
# FIXME RBC 20060228 make fast by only inserting an index with null
772
self.add_lines(new_version_id, parents, self.get_lines(old_version_id))
774
def get_lines(self, version_id):
775
"""See VersionedFile.get_lines()."""
776
return self.get_line_list([version_id])[0]
778
def _get_record_map(self, version_ids):
779
"""Produce a dictionary of knit records.
781
The keys are version_ids, the values are tuples of (method, content,
783
method is the way the content should be applied.
784
content is a KnitContent object.
785
digest is the SHA1 digest of this version id after all steps are done
786
next is the build-parent of the version, i.e. the leftmost ancestor.
787
If the method is fulltext, next will be None.
789
position_map = self._get_components_positions(version_ids)
790
# c = component_id, m = method, p = position, s = size, n = next
791
records = [(c, p, s) for c, (m, p, s, n) in position_map.iteritems()]
793
for component_id, content, digest in \
794
self._data.read_records_iter(records):
795
method, position, size, next = position_map[component_id]
796
record_map[component_id] = method, content, digest, next
800
def get_text(self, version_id):
801
"""See VersionedFile.get_text"""
802
return self.get_texts([version_id])[0]
804
def get_texts(self, version_ids):
805
return [''.join(l) for l in self.get_line_list(version_ids)]
807
def get_line_list(self, version_ids):
808
"""Return the texts of listed versions as a list of strings."""
809
version_ids = [osutils.safe_revision_id(v) for v in version_ids]
810
for version_id in version_ids:
811
self.check_not_reserved_id(version_id)
812
text_map, content_map = self._get_content_maps(version_ids)
813
return [text_map[v] for v in version_ids]
815
def _get_content_maps(self, version_ids):
816
"""Produce maps of text and KnitContents
818
:return: (text_map, content_map) where text_map contains the texts for
819
the requested versions and content_map contains the KnitContents.
820
Both dicts take version_ids as their keys.
822
for version_id in version_ids:
823
if not self.has_version(version_id):
824
raise RevisionNotPresent(version_id, self.filename)
825
record_map = self._get_record_map(version_ids)
830
for version_id in version_ids:
833
while cursor is not None:
834
method, data, digest, next = record_map[cursor]
835
components.append((cursor, method, data, digest))
836
if cursor in content_map:
841
for component_id, method, data, digest in reversed(components):
842
if component_id in content_map:
843
content = content_map[component_id]
845
if method == 'fulltext':
846
assert content is None
847
content = self.factory.parse_fulltext(data, version_id)
848
elif method == 'line-delta':
849
delta = self.factory.parse_line_delta(data, version_id)
850
content = content.copy()
851
content._lines = self._apply_delta(content._lines,
853
content_map[component_id] = content
855
if 'no-eol' in self._index.get_options(version_id):
856
content = content.copy()
857
line = content._lines[-1][1].rstrip('\n')
858
content._lines[-1] = (content._lines[-1][0], line)
859
final_content[version_id] = content
861
# digest here is the digest from the last applied component.
862
text = content.text()
863
if sha_strings(text) != digest:
864
raise KnitCorrupt(self.filename,
865
'sha-1 does not match %s' % version_id)
867
text_map[version_id] = text
868
return text_map, final_content
870
def iter_lines_added_or_present_in_versions(self, version_ids=None,
872
"""See VersionedFile.iter_lines_added_or_present_in_versions()."""
873
if version_ids is None:
874
version_ids = self.versions()
876
version_ids = [osutils.safe_revision_id(v) for v in version_ids]
878
pb = progress.DummyProgress()
879
# we don't care about inclusions, the caller cares.
880
# but we need to setup a list of records to visit.
881
# we need version_id, position, length
882
version_id_records = []
883
requested_versions = set(version_ids)
884
# filter for available versions
885
for version_id in requested_versions:
886
if not self.has_version(version_id):
887
raise RevisionNotPresent(version_id, self.filename)
888
# get a in-component-order queue:
889
for version_id in self.versions():
890
if version_id in requested_versions:
891
data_pos, length = self._index.get_position(version_id)
892
version_id_records.append((version_id, data_pos, length))
894
total = len(version_id_records)
895
for version_idx, (version_id, data, sha_value) in \
896
enumerate(self._data.read_records_iter(version_id_records)):
897
pb.update('Walking content.', version_idx, total)
898
method = self._index.get_method(version_id)
900
assert method in ('fulltext', 'line-delta')
901
if method == 'fulltext':
902
line_iterator = self.factory.get_fulltext_content(data)
904
line_iterator = self.factory.get_linedelta_content(data)
905
for line in line_iterator:
908
pb.update('Walking content.', total, total)
910
def num_versions(self):
911
"""See VersionedFile.num_versions()."""
912
return self._index.num_versions()
914
__len__ = num_versions
916
def annotate_iter(self, version_id):
917
"""See VersionedFile.annotate_iter."""
918
version_id = osutils.safe_revision_id(version_id)
919
content = self._get_content(version_id)
920
for origin, text in content.annotate_iter():
923
def get_parents(self, version_id):
924
"""See VersionedFile.get_parents."""
927
# 52554 calls in 1264 872 internal down from 3674
928
version_id = osutils.safe_revision_id(version_id)
930
return self._index.get_parents(version_id)
932
raise RevisionNotPresent(version_id, self.filename)
934
def get_parents_with_ghosts(self, version_id):
935
"""See VersionedFile.get_parents."""
936
version_id = osutils.safe_revision_id(version_id)
938
return self._index.get_parents_with_ghosts(version_id)
940
raise RevisionNotPresent(version_id, self.filename)
942
def get_ancestry(self, versions, topo_sorted=True):
943
"""See VersionedFile.get_ancestry."""
944
if isinstance(versions, basestring):
945
versions = [versions]
948
versions = [osutils.safe_revision_id(v) for v in versions]
949
return self._index.get_ancestry(versions, topo_sorted)
951
def get_ancestry_with_ghosts(self, versions):
952
"""See VersionedFile.get_ancestry_with_ghosts."""
953
if isinstance(versions, basestring):
954
versions = [versions]
957
versions = [osutils.safe_revision_id(v) for v in versions]
958
return self._index.get_ancestry_with_ghosts(versions)
960
#@deprecated_method(zero_eight)
961
def walk(self, version_ids):
962
"""See VersionedFile.walk."""
963
# We take the short path here, and extract all relevant texts
964
# and put them in a weave and let that do all the work. Far
965
# from optimal, but is much simpler.
966
# FIXME RB 20060228 this really is inefficient!
967
from bzrlib.weave import Weave
969
w = Weave(self.filename)
970
ancestry = set(self.get_ancestry(version_ids, topo_sorted=False))
971
sorted_graph = topo_sort(self._index.get_graph())
972
version_list = [vid for vid in sorted_graph if vid in ancestry]
974
for version_id in version_list:
975
lines = self.get_lines(version_id)
976
w.add_lines(version_id, self.get_parents(version_id), lines)
978
for lineno, insert_id, dset, line in w.walk(version_ids):
979
yield lineno, insert_id, dset, line
981
def plan_merge(self, ver_a, ver_b):
982
"""See VersionedFile.plan_merge."""
983
ver_a = osutils.safe_revision_id(ver_a)
984
ver_b = osutils.safe_revision_id(ver_b)
985
ancestors_b = set(self.get_ancestry(ver_b, topo_sorted=False))
986
def status_a(revision, text):
987
if revision in ancestors_b:
988
return 'killed-b', text
992
ancestors_a = set(self.get_ancestry(ver_a, topo_sorted=False))
993
def status_b(revision, text):
994
if revision in ancestors_a:
995
return 'killed-a', text
999
annotated_a = self.annotate(ver_a)
1000
annotated_b = self.annotate(ver_b)
1001
plain_a = [t for (a, t) in annotated_a]
1002
plain_b = [t for (a, t) in annotated_b]
1003
blocks = KnitSequenceMatcher(None, plain_a, plain_b).get_matching_blocks()
1006
for ai, bi, l in blocks:
1007
# process all mismatched sections
1008
# (last mismatched section is handled because blocks always
1009
# includes a 0-length last block)
1010
for revision, text in annotated_a[a_cur:ai]:
1011
yield status_a(revision, text)
1012
for revision, text in annotated_b[b_cur:bi]:
1013
yield status_b(revision, text)
1015
# and now the matched section
1018
for text_a, text_b in zip(plain_a[ai:a_cur], plain_b[bi:b_cur]):
1019
assert text_a == text_b
1020
yield "unchanged", text_a
1023
class _KnitComponentFile(object):
1024
"""One of the files used to implement a knit database"""
1026
def __init__(self, transport, filename, mode, file_mode=None,
1027
create_parent_dir=False, dir_mode=None):
1028
self._transport = transport
1029
self._filename = filename
1031
self._file_mode = file_mode
1032
self._dir_mode = dir_mode
1033
self._create_parent_dir = create_parent_dir
1034
self._need_to_create = False
1036
def _full_path(self):
1037
"""Return the full path to this file."""
1038
return self._transport.base + self._filename
1040
def check_header(self, fp):
1041
line = fp.readline()
1043
# An empty file can actually be treated as though the file doesn't
1045
raise errors.NoSuchFile(self._full_path())
1046
if line != self.HEADER:
1047
raise KnitHeaderError(badline=line,
1048
filename=self._transport.abspath(self._filename))
1051
"""Commit is a nop."""
1054
return '%s(%s)' % (self.__class__.__name__, self._filename)
1057
class _KnitIndex(_KnitComponentFile):
1058
"""Manages knit index file.
1060
The index is already kept in memory and read on startup, to enable
1061
fast lookups of revision information. The cursor of the index
1062
file is always pointing to the end, making it easy to append
1065
_cache is a cache for fast mapping from version id to a Index
1068
_history is a cache for fast mapping from indexes to version ids.
1070
The index data format is dictionary compressed when it comes to
1071
parent references; a index entry may only have parents that with a
1072
lover index number. As a result, the index is topological sorted.
1074
Duplicate entries may be written to the index for a single version id
1075
if this is done then the latter one completely replaces the former:
1076
this allows updates to correct version and parent information.
1077
Note that the two entries may share the delta, and that successive
1078
annotations and references MUST point to the first entry.
1080
The index file on disc contains a header, followed by one line per knit
1081
record. The same revision can be present in an index file more than once.
1082
The first occurrence gets assigned a sequence number starting from 0.
1084
The format of a single line is
1085
REVISION_ID FLAGS BYTE_OFFSET LENGTH( PARENT_ID|PARENT_SEQUENCE_ID)* :\n
1086
REVISION_ID is a utf8-encoded revision id
1087
FLAGS is a comma separated list of flags about the record. Values include
1088
no-eol, line-delta, fulltext.
1089
BYTE_OFFSET is the ascii representation of the byte offset in the data file
1090
that the the compressed data starts at.
1091
LENGTH is the ascii representation of the length of the data file.
1092
PARENT_ID a utf-8 revision id prefixed by a '.' that is a parent of
1094
PARENT_SEQUENCE_ID the ascii representation of the sequence number of a
1095
revision id already in the knit that is a parent of REVISION_ID.
1096
The ' :' marker is the end of record marker.
1099
when a write is interrupted to the index file, it will result in a line
1100
that does not end in ' :'. If the ' :' is not present at the end of a line,
1101
or at the end of the file, then the record that is missing it will be
1102
ignored by the parser.
1104
When writing new records to the index file, the data is preceded by '\n'
1105
to ensure that records always start on new lines even if the last write was
1106
interrupted. As a result its normal for the last line in the index to be
1107
missing a trailing newline. One can be added with no harmful effects.
1110
HEADER = "# bzr knit index 8\n"
1112
# speed of knit parsing went from 280 ms to 280 ms with slots addition.
1113
# __slots__ = ['_cache', '_history', '_transport', '_filename']
1115
def _cache_version(self, version_id, options, pos, size, parents):
1116
"""Cache a version record in the history array and index cache.
1118
This is inlined into _load_data for performance. KEEP IN SYNC.
1119
(It saves 60ms, 25% of the __init__ overhead on local 4000 record
1122
# only want the _history index to reference the 1st index entry
1124
if version_id not in self._cache:
1125
index = len(self._history)
1126
self._history.append(version_id)
1128
index = self._cache[version_id][5]
1129
self._cache[version_id] = (version_id,
1136
def __init__(self, transport, filename, mode, create=False, file_mode=None,
1137
create_parent_dir=False, delay_create=False, dir_mode=None):
1138
_KnitComponentFile.__init__(self, transport, filename, mode,
1139
file_mode=file_mode,
1140
create_parent_dir=create_parent_dir,
1143
# position in _history is the 'official' index for a revision
1144
# but the values may have come from a newer entry.
1145
# so - wc -l of a knit index is != the number of unique names
1149
fp = self._transport.get(self._filename)
1151
# _load_data may raise NoSuchFile if the target knit is
1153
_load_data(self, fp)
1157
if mode != 'w' or not create:
1160
self._need_to_create = True
1162
self._transport.put_bytes_non_atomic(
1163
self._filename, self.HEADER, mode=self._file_mode)
1165
def get_graph(self):
1166
return [(vid, idx[4]) for vid, idx in self._cache.iteritems()]
1168
def get_ancestry(self, versions, topo_sorted=True):
1169
"""See VersionedFile.get_ancestry."""
1170
# get a graph of all the mentioned versions:
1172
pending = set(versions)
1175
version = pending.pop()
1178
parents = [p for p in cache[version][4] if p in cache]
1180
raise RevisionNotPresent(version, self._filename)
1181
# if not completed and not a ghost
1182
pending.update([p for p in parents if p not in graph])
1183
graph[version] = parents
1186
return topo_sort(graph.items())
1188
def get_ancestry_with_ghosts(self, versions):
1189
"""See VersionedFile.get_ancestry_with_ghosts."""
1190
# get a graph of all the mentioned versions:
1191
self.check_versions_present(versions)
1194
pending = set(versions)
1196
version = pending.pop()
1198
parents = cache[version][4]
1204
pending.update([p for p in parents if p not in graph])
1205
graph[version] = parents
1206
return topo_sort(graph.items())
1208
def num_versions(self):
1209
return len(self._history)
1211
__len__ = num_versions
1213
def get_versions(self):
1214
return self._history
1216
def idx_to_name(self, idx):
1217
return self._history[idx]
1219
def lookup(self, version_id):
1220
assert version_id in self._cache
1221
return self._cache[version_id][5]
1223
def _version_list_to_index(self, versions):
1226
for version in versions:
1227
if version in cache:
1228
# -- inlined lookup() --
1229
result_list.append(str(cache[version][5]))
1230
# -- end lookup () --
1232
result_list.append('.' + version)
1233
return ' '.join(result_list)
1235
def add_version(self, version_id, options, pos, size, parents):
1236
"""Add a version record to the index."""
1237
self.add_versions(((version_id, options, pos, size, parents),))
1239
def add_versions(self, versions):
1240
"""Add multiple versions to the index.
1242
:param versions: a list of tuples:
1243
(version_id, options, pos, size, parents).
1246
orig_history = self._history[:]
1247
orig_cache = self._cache.copy()
1250
for version_id, options, pos, size, parents in versions:
1251
line = "\n%s %s %s %s %s :" % (version_id,
1255
self._version_list_to_index(parents))
1256
assert isinstance(line, str), \
1257
'content must be utf-8 encoded: %r' % (line,)
1259
self._cache_version(version_id, options, pos, size, parents)
1260
if not self._need_to_create:
1261
self._transport.append_bytes(self._filename, ''.join(lines))
1264
sio.write(self.HEADER)
1265
sio.writelines(lines)
1267
self._transport.put_file_non_atomic(self._filename, sio,
1268
create_parent_dir=self._create_parent_dir,
1269
mode=self._file_mode,
1270
dir_mode=self._dir_mode)
1271
self._need_to_create = False
1273
# If any problems happen, restore the original values and re-raise
1274
self._history = orig_history
1275
self._cache = orig_cache
1278
def has_version(self, version_id):
1279
"""True if the version is in the index."""
1280
return version_id in self._cache
1282
def get_position(self, version_id):
1283
"""Return data position and size of specified version."""
1284
entry = self._cache[version_id]
1285
return entry[2], entry[3]
1287
def get_method(self, version_id):
1288
"""Return compression method of specified version."""
1289
options = self._cache[version_id][1]
1290
if 'fulltext' in options:
1293
if 'line-delta' not in options:
1294
raise errors.KnitIndexUnknownMethod(self._full_path(), options)
1297
def get_options(self, version_id):
1298
return self._cache[version_id][1]
1300
def get_parents(self, version_id):
1301
"""Return parents of specified version ignoring ghosts."""
1302
return [parent for parent in self._cache[version_id][4]
1303
if parent in self._cache]
1305
def get_parents_with_ghosts(self, version_id):
1306
"""Return parents of specified version with ghosts."""
1307
return self._cache[version_id][4]
1309
def check_versions_present(self, version_ids):
1310
"""Check that all specified versions are present."""
1312
for version_id in version_ids:
1313
if version_id not in cache:
1314
raise RevisionNotPresent(version_id, self._filename)
1317
class _KnitData(_KnitComponentFile):
1318
"""Contents of the knit data file"""
1320
def __init__(self, transport, filename, mode, create=False, file_mode=None,
1321
create_parent_dir=False, delay_create=False,
1323
_KnitComponentFile.__init__(self, transport, filename, mode,
1324
file_mode=file_mode,
1325
create_parent_dir=create_parent_dir,
1327
self._checked = False
1328
# TODO: jam 20060713 conceptually, this could spill to disk
1329
# if the cached size gets larger than a certain amount
1330
# but it complicates the model a bit, so for now just use
1331
# a simple dictionary
1333
self._do_cache = False
1336
self._need_to_create = create
1338
self._transport.put_bytes_non_atomic(self._filename, '',
1339
mode=self._file_mode)
1341
def enable_cache(self):
1342
"""Enable caching of reads."""
1343
self._do_cache = True
1345
def clear_cache(self):
1346
"""Clear the record cache."""
1347
self._do_cache = False
1350
def _open_file(self):
1352
return self._transport.get(self._filename)
1357
def _record_to_data(self, version_id, digest, lines):
1358
"""Convert version_id, digest, lines into a raw data block.
1360
:return: (len, a StringIO instance with the raw data ready to read.)
1363
data_file = GzipFile(None, mode='wb', fileobj=sio)
1365
assert isinstance(version_id, str)
1366
data_file.writelines(chain(
1367
["version %s %d %s\n" % (version_id,
1371
["end %s\n" % version_id]))
1378
def add_raw_record(self, raw_data):
1379
"""Append a prepared record to the data file.
1381
:return: the offset in the data file raw_data was written.
1383
assert isinstance(raw_data, str), 'data must be plain bytes'
1384
if not self._need_to_create:
1385
return self._transport.append_bytes(self._filename, raw_data)
1387
self._transport.put_bytes_non_atomic(self._filename, raw_data,
1388
create_parent_dir=self._create_parent_dir,
1389
mode=self._file_mode,
1390
dir_mode=self._dir_mode)
1391
self._need_to_create = False
1394
def add_record(self, version_id, digest, lines):
1395
"""Write new text record to disk. Returns the position in the
1396
file where it was written."""
1397
size, sio = self._record_to_data(version_id, digest, lines)
1399
if not self._need_to_create:
1400
start_pos = self._transport.append_file(self._filename, sio)
1402
self._transport.put_file_non_atomic(self._filename, sio,
1403
create_parent_dir=self._create_parent_dir,
1404
mode=self._file_mode,
1405
dir_mode=self._dir_mode)
1406
self._need_to_create = False
1409
self._cache[version_id] = sio.getvalue()
1410
return start_pos, size
1412
def _parse_record_header(self, version_id, raw_data):
1413
"""Parse a record header for consistency.
1415
:return: the header and the decompressor stream.
1416
as (stream, header_record)
1418
df = GzipFile(mode='rb', fileobj=StringIO(raw_data))
1420
rec = self._check_header(version_id, df.readline())
1421
except Exception, e:
1422
raise KnitCorrupt(self._filename,
1423
"While reading {%s} got %s(%s)"
1424
% (version_id, e.__class__.__name__, str(e)))
1427
def _check_header(self, version_id, line):
1430
raise KnitCorrupt(self._filename,
1431
'unexpected number of elements in record header')
1432
if rec[1] != version_id:
1433
raise KnitCorrupt(self._filename,
1434
'unexpected version, wanted %r, got %r'
1435
% (version_id, rec[1]))
1438
def _parse_record(self, version_id, data):
1440
# 4168 calls in 2880 217 internal
1441
# 4168 calls to _parse_record_header in 2121
1442
# 4168 calls to readlines in 330
1443
df = GzipFile(mode='rb', fileobj=StringIO(data))
1446
record_contents = df.readlines()
1447
except Exception, e:
1448
raise KnitCorrupt(self._filename,
1449
"While reading {%s} got %s(%s)"
1450
% (version_id, e.__class__.__name__, str(e)))
1451
header = record_contents.pop(0)
1452
rec = self._check_header(version_id, header)
1454
last_line = record_contents.pop()
1455
if len(record_contents) != int(rec[2]):
1456
raise KnitCorrupt(self._filename,
1457
'incorrect number of lines %s != %s'
1459
% (len(record_contents), int(rec[2]),
1461
if last_line != 'end %s\n' % rec[1]:
1462
raise KnitCorrupt(self._filename,
1463
'unexpected version end line %r, wanted %r'
1464
% (last_line, version_id))
1466
return record_contents, rec[3]
1468
def read_records_iter_raw(self, records):
1469
"""Read text records from data file and yield raw data.
1471
This unpacks enough of the text record to validate the id is
1472
as expected but thats all.
1474
# setup an iterator of the external records:
1475
# uses readv so nice and fast we hope.
1477
# grab the disk data needed.
1479
# Don't check _cache if it is empty
1480
needed_offsets = [(pos, size) for version_id, pos, size
1482
if version_id not in self._cache]
1484
needed_offsets = [(pos, size) for version_id, pos, size
1487
raw_records = self._transport.readv(self._filename, needed_offsets)
1489
for version_id, pos, size in records:
1490
if version_id in self._cache:
1491
# This data has already been validated
1492
data = self._cache[version_id]
1494
pos, data = raw_records.next()
1496
self._cache[version_id] = data
1498
# validate the header
1499
df, rec = self._parse_record_header(version_id, data)
1501
yield version_id, data
1503
def read_records_iter(self, records):
1504
"""Read text records from data file and yield result.
1506
The result will be returned in whatever is the fastest to read.
1507
Not by the order requested. Also, multiple requests for the same
1508
record will only yield 1 response.
1509
:param records: A list of (version_id, pos, len) entries
1510
:return: Yields (version_id, contents, digest) in the order
1511
read, not the order requested
1517
# Skip records we have alread seen
1518
yielded_records = set()
1519
needed_records = set()
1520
for record in records:
1521
if record[0] in self._cache:
1522
if record[0] in yielded_records:
1524
yielded_records.add(record[0])
1525
data = self._cache[record[0]]
1526
content, digest = self._parse_record(record[0], data)
1527
yield (record[0], content, digest)
1529
needed_records.add(record)
1530
needed_records = sorted(needed_records, key=operator.itemgetter(1))
1532
needed_records = sorted(set(records), key=operator.itemgetter(1))
1534
if not needed_records:
1537
# The transport optimizes the fetching as well
1538
# (ie, reads continuous ranges.)
1539
readv_response = self._transport.readv(self._filename,
1540
[(pos, size) for version_id, pos, size in needed_records])
1542
for (version_id, pos, size), (pos, data) in \
1543
izip(iter(needed_records), readv_response):
1544
content, digest = self._parse_record(version_id, data)
1546
self._cache[version_id] = data
1547
yield version_id, content, digest
1549
def read_records(self, records):
1550
"""Read records into a dictionary."""
1552
for record_id, content, digest in \
1553
self.read_records_iter(records):
1554
components[record_id] = (content, digest)
1558
class InterKnit(InterVersionedFile):
1559
"""Optimised code paths for knit to knit operations."""
1561
_matching_file_from_factory = KnitVersionedFile
1562
_matching_file_to_factory = KnitVersionedFile
1565
def is_compatible(source, target):
1566
"""Be compatible with knits. """
1568
return (isinstance(source, KnitVersionedFile) and
1569
isinstance(target, KnitVersionedFile))
1570
except AttributeError:
1573
def join(self, pb=None, msg=None, version_ids=None, ignore_missing=False):
1574
"""See InterVersionedFile.join."""
1575
assert isinstance(self.source, KnitVersionedFile)
1576
assert isinstance(self.target, KnitVersionedFile)
1578
version_ids = self._get_source_version_ids(version_ids, ignore_missing)
1583
pb = ui.ui_factory.nested_progress_bar()
1585
version_ids = list(version_ids)
1586
if None in version_ids:
1587
version_ids.remove(None)
1589
self.source_ancestry = set(self.source.get_ancestry(version_ids))
1590
this_versions = set(self.target._index.get_versions())
1591
needed_versions = self.source_ancestry - this_versions
1592
cross_check_versions = self.source_ancestry.intersection(this_versions)
1593
mismatched_versions = set()
1594
for version in cross_check_versions:
1595
# scan to include needed parents.
1596
n1 = set(self.target.get_parents_with_ghosts(version))
1597
n2 = set(self.source.get_parents_with_ghosts(version))
1599
# FIXME TEST this check for cycles being introduced works
1600
# the logic is we have a cycle if in our graph we are an
1601
# ancestor of any of the n2 revisions.
1607
parent_ancestors = self.source.get_ancestry(parent)
1608
if version in parent_ancestors:
1609
raise errors.GraphCycleError([parent, version])
1610
# ensure this parent will be available later.
1611
new_parents = n2.difference(n1)
1612
needed_versions.update(new_parents.difference(this_versions))
1613
mismatched_versions.add(version)
1615
if not needed_versions and not mismatched_versions:
1617
full_list = topo_sort(self.source.get_graph())
1619
version_list = [i for i in full_list if (not self.target.has_version(i)
1620
and i in needed_versions)]
1624
copy_queue_records = []
1626
for version_id in version_list:
1627
options = self.source._index.get_options(version_id)
1628
parents = self.source._index.get_parents_with_ghosts(version_id)
1629
# check that its will be a consistent copy:
1630
for parent in parents:
1631
# if source has the parent, we must :
1632
# * already have it or
1633
# * have it scheduled already
1634
# otherwise we don't care
1635
assert (self.target.has_version(parent) or
1636
parent in copy_set or
1637
not self.source.has_version(parent))
1638
data_pos, data_size = self.source._index.get_position(version_id)
1639
copy_queue_records.append((version_id, data_pos, data_size))
1640
copy_queue.append((version_id, options, parents))
1641
copy_set.add(version_id)
1643
# data suck the join:
1645
total = len(version_list)
1648
for (version_id, raw_data), \
1649
(version_id2, options, parents) in \
1650
izip(self.source._data.read_records_iter_raw(copy_queue_records),
1652
assert version_id == version_id2, 'logic error, inconsistent results'
1654
pb.update("Joining knit", count, total)
1655
raw_records.append((version_id, options, parents, len(raw_data)))
1656
raw_datum.append(raw_data)
1657
self.target._add_raw_records(raw_records, ''.join(raw_datum))
1659
for version in mismatched_versions:
1660
# FIXME RBC 20060309 is this needed?
1661
n1 = set(self.target.get_parents_with_ghosts(version))
1662
n2 = set(self.source.get_parents_with_ghosts(version))
1663
# write a combined record to our history preserving the current
1664
# parents as first in the list
1665
new_parents = self.target.get_parents_with_ghosts(version) + list(n2.difference(n1))
1666
self.target.fix_parents(version, new_parents)
1672
InterVersionedFile.register_optimiser(InterKnit)
1675
class WeaveToKnit(InterVersionedFile):
1676
"""Optimised code paths for weave to knit operations."""
1678
_matching_file_from_factory = bzrlib.weave.WeaveFile
1679
_matching_file_to_factory = KnitVersionedFile
1682
def is_compatible(source, target):
1683
"""Be compatible with weaves to knits."""
1685
return (isinstance(source, bzrlib.weave.Weave) and
1686
isinstance(target, KnitVersionedFile))
1687
except AttributeError:
1690
def join(self, pb=None, msg=None, version_ids=None, ignore_missing=False):
1691
"""See InterVersionedFile.join."""
1692
assert isinstance(self.source, bzrlib.weave.Weave)
1693
assert isinstance(self.target, KnitVersionedFile)
1695
version_ids = self._get_source_version_ids(version_ids, ignore_missing)
1700
pb = ui.ui_factory.nested_progress_bar()
1702
version_ids = list(version_ids)
1704
self.source_ancestry = set(self.source.get_ancestry(version_ids))
1705
this_versions = set(self.target._index.get_versions())
1706
needed_versions = self.source_ancestry - this_versions
1707
cross_check_versions = self.source_ancestry.intersection(this_versions)
1708
mismatched_versions = set()
1709
for version in cross_check_versions:
1710
# scan to include needed parents.
1711
n1 = set(self.target.get_parents_with_ghosts(version))
1712
n2 = set(self.source.get_parents(version))
1713
# if all of n2's parents are in n1, then its fine.
1714
if n2.difference(n1):
1715
# FIXME TEST this check for cycles being introduced works
1716
# the logic is we have a cycle if in our graph we are an
1717
# ancestor of any of the n2 revisions.
1723
parent_ancestors = self.source.get_ancestry(parent)
1724
if version in parent_ancestors:
1725
raise errors.GraphCycleError([parent, version])
1726
# ensure this parent will be available later.
1727
new_parents = n2.difference(n1)
1728
needed_versions.update(new_parents.difference(this_versions))
1729
mismatched_versions.add(version)
1731
if not needed_versions and not mismatched_versions:
1733
full_list = topo_sort(self.source.get_graph())
1735
version_list = [i for i in full_list if (not self.target.has_version(i)
1736
and i in needed_versions)]
1740
total = len(version_list)
1741
for version_id in version_list:
1742
pb.update("Converting to knit", count, total)
1743
parents = self.source.get_parents(version_id)
1744
# check that its will be a consistent copy:
1745
for parent in parents:
1746
# if source has the parent, we must already have it
1747
assert (self.target.has_version(parent))
1748
self.target.add_lines(
1749
version_id, parents, self.source.get_lines(version_id))
1752
for version in mismatched_versions:
1753
# FIXME RBC 20060309 is this needed?
1754
n1 = set(self.target.get_parents_with_ghosts(version))
1755
n2 = set(self.source.get_parents(version))
1756
# write a combined record to our history preserving the current
1757
# parents as first in the list
1758
new_parents = self.target.get_parents_with_ghosts(version) + list(n2.difference(n1))
1759
self.target.fix_parents(version, new_parents)
1765
InterVersionedFile.register_optimiser(WeaveToKnit)
1768
class KnitSequenceMatcher(difflib.SequenceMatcher):
1769
"""Knit tuned sequence matcher.
1771
This is based on profiling of difflib which indicated some improvements
1772
for our usage pattern.
1775
def find_longest_match(self, alo, ahi, blo, bhi):
1776
"""Find longest matching block in a[alo:ahi] and b[blo:bhi].
1778
If isjunk is not defined:
1780
Return (i,j,k) such that a[i:i+k] is equal to b[j:j+k], where
1781
alo <= i <= i+k <= ahi
1782
blo <= j <= j+k <= bhi
1783
and for all (i',j',k') meeting those conditions,
1786
and if i == i', j <= j'
1788
In other words, of all maximal matching blocks, return one that
1789
starts earliest in a, and of all those maximal matching blocks that
1790
start earliest in a, return the one that starts earliest in b.
1792
>>> s = SequenceMatcher(None, " abcd", "abcd abcd")
1793
>>> s.find_longest_match(0, 5, 0, 9)
1796
If isjunk is defined, first the longest matching block is
1797
determined as above, but with the additional restriction that no
1798
junk element appears in the block. Then that block is extended as
1799
far as possible by matching (only) junk elements on both sides. So
1800
the resulting block never matches on junk except as identical junk
1801
happens to be adjacent to an "interesting" match.
1803
Here's the same example as before, but considering blanks to be
1804
junk. That prevents " abcd" from matching the " abcd" at the tail
1805
end of the second sequence directly. Instead only the "abcd" can
1806
match, and matches the leftmost "abcd" in the second sequence:
1808
>>> s = SequenceMatcher(lambda x: x==" ", " abcd", "abcd abcd")
1809
>>> s.find_longest_match(0, 5, 0, 9)
1812
If no blocks match, return (alo, blo, 0).
1814
>>> s = SequenceMatcher(None, "ab", "c")
1815
>>> s.find_longest_match(0, 2, 0, 1)
1819
# CAUTION: stripping common prefix or suffix would be incorrect.
1823
# Longest matching block is "ab", but if common prefix is
1824
# stripped, it's "a" (tied with "b"). UNIX(tm) diff does so
1825
# strip, so ends up claiming that ab is changed to acab by
1826
# inserting "ca" in the middle. That's minimal but unintuitive:
1827
# "it's obvious" that someone inserted "ac" at the front.
1828
# Windiff ends up at the same place as diff, but by pairing up
1829
# the unique 'b's and then matching the first two 'a's.
1831
a, b, b2j, isbjunk = self.a, self.b, self.b2j, self.isbjunk
1832
besti, bestj, bestsize = alo, blo, 0
1833
# find longest junk-free match
1834
# during an iteration of the loop, j2len[j] = length of longest
1835
# junk-free match ending with a[i-1] and b[j]
1839
for i in xrange(alo, ahi):
1840
# look at all instances of a[i] in b; note that because
1841
# b2j has no junk keys, the loop is skipped if a[i] is junk
1842
j2lenget = j2len.get
1845
# changing b2j.get(a[i], nothing) to a try:KeyError pair produced the
1846
# following improvement
1847
# 704 0 4650.5320 2620.7410 bzrlib.knit:1336(find_longest_match)
1848
# +326674 0 1655.1210 1655.1210 +<method 'get' of 'dict' objects>
1849
# +76519 0 374.6700 374.6700 +<method 'has_key' of 'dict' objects>
1851
# 704 0 3733.2820 2209.6520 bzrlib.knit:1336(find_longest_match)
1852
# +211400 0 1147.3520 1147.3520 +<method 'get' of 'dict' objects>
1853
# +76519 0 376.2780 376.2780 +<method 'has_key' of 'dict' objects>
1865
k = newj2len[j] = 1 + j2lenget(-1 + j, 0)
1867
besti, bestj, bestsize = 1 + i-k, 1 + j-k, k
1870
# Extend the best by non-junk elements on each end. In particular,
1871
# "popular" non-junk elements aren't in b2j, which greatly speeds
1872
# the inner loop above, but also means "the best" match so far
1873
# doesn't contain any junk *or* popular non-junk elements.
1874
while besti > alo and bestj > blo and \
1875
not isbjunk(b[bestj-1]) and \
1876
a[besti-1] == b[bestj-1]:
1877
besti, bestj, bestsize = besti-1, bestj-1, bestsize+1
1878
while besti+bestsize < ahi and bestj+bestsize < bhi and \
1879
not isbjunk(b[bestj+bestsize]) and \
1880
a[besti+bestsize] == b[bestj+bestsize]:
1883
# Now that we have a wholly interesting match (albeit possibly
1884
# empty!), we may as well suck up the matching junk on each
1885
# side of it too. Can't think of a good reason not to, and it
1886
# saves post-processing the (possibly considerable) expense of
1887
# figuring out what to do with it. In the case of an empty
1888
# interesting match, this is clearly the right thing to do,
1889
# because no other kind of match is possible in the regions.
1890
while besti > alo and bestj > blo and \
1891
isbjunk(b[bestj-1]) and \
1892
a[besti-1] == b[bestj-1]:
1893
besti, bestj, bestsize = besti-1, bestj-1, bestsize+1
1894
while besti+bestsize < ahi and bestj+bestsize < bhi and \
1895
isbjunk(b[bestj+bestsize]) and \
1896
a[besti+bestsize] == b[bestj+bestsize]:
1897
bestsize = bestsize + 1
1899
return besti, bestj, bestsize
1903
from bzrlib._knit_load_data_c import _load_data_c as _load_data
1905
from bzrlib._knit_load_data_py import _load_data_py as _load_data
added
removed
bzrlib/knit.py
