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# Copyright (C) 2005 Canonical Ltd
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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# Author: Martin Pool <mbp@canonical.com>
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"""Store and retrieve weaves in files.
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There is one format marker followed by a blank line, followed by a
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series of version headers, followed by the weave itself.
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Each version marker has 'i' and the included previous versions, then
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'1' and the SHA-1 of the text, if known. The inclusions do not need
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to list versions included by a parent.
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The weave is bracketed by 'w' and 'W' lines, and includes the '{}[]'
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processing instructions. Lines of text are prefixed by '.' if the
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line contains a newline, or ',' if not.
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# TODO: When extracting a single version it'd be enough to just pass
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# an iterator returning the weave lines... We don't really need to
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# deserialize it into memory.
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FORMAT_1 = '# bzr weave file v4\n'
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def write_weave(weave, f, format=None):
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if format == None or format == 1:
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return write_weave_v4(weave, f)
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raise ValueError("unknown weave format %r" % format)
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def write_weave_v4(weave, f):
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"""Write weave to file f."""
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for version, included in enumerate(weave._parents):
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# mininc = weave.minimal_parents(version)
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print >>f, '1', weave._sha1s[version]
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for l in weave._weave:
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if isinstance(l, tuple):
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print >>f, '%s %d' % l
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assert l.find('\n', 0, -1) == -1
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assert l.find('\n') == -1
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return read_weave_v4(f)
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from weave import Weave, WeaveFormatError
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wfe = WeaveFormatError
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raise WeaveFormatError('invalid weave file header: %r' % l)
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w._parents.append(frozenset(map(int, l[2:].split(' '))))
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w._parents.append(frozenset())
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l = f.readline()[:-1]
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assert l.startswith('1 ')
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w._sha1s.append(l[2:])
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raise WeaveFormatError('unexpected line %r' % l)
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elif l.startswith('. '):
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w._weave.append(l[2:]) # include newline
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elif l.startswith(', '):
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w._weave.append(l[2:-1]) # exclude newline
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w._weave.append(('}', None))
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assert l[0] in '{[]', l
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assert l[1] == ' ', l
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w._weave.append((intern(l[0]), int(l[2:])))
added
removed
bzrlib/weavefile.py
