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