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# Copyright (C) 2007, 2008 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
"""Python implementations of Dirstate Helper functions."""
import os
# We cannot import the dirstate module, because it loads this module
# All we really need is the IN_MEMORY_MODIFIED constant
from bzrlib import errors
from bzrlib.dirstate import DirState
def _bisect_path_left_py(paths, path):
"""Return the index where to insert path into paths.
This uses the dirblock sorting. So all children in a directory come before
the children of children. For example::
a/
b/
c
d/
e
b-c
d-e
a-a
a=c
Will be sorted as::
a
a-a
a=c
a/b
a/b-c
a/d
a/d-e
a/b/c
a/d/e
:param paths: A list of paths to search through
:param path: A single path to insert
:return: An offset where 'path' can be inserted.
:seealso: bisect.bisect_left
"""
hi = len(paths)
lo = 0
while lo < hi:
mid = (lo + hi) // 2
# Grab the dirname for the current dirblock
cur = paths[mid]
if _cmp_path_by_dirblock_py(cur, path) < 0:
lo = mid + 1
else:
hi = mid
return lo
def _bisect_path_right_py(paths, path):
"""Return the index where to insert path into paths.
This uses a path-wise comparison so we get::
a
a-b
a=b
a/b
Rather than::
a
a-b
a/b
a=b
:param paths: A list of paths to search through
:param path: A single path to insert
:return: An offset where 'path' can be inserted.
:seealso: bisect.bisect_right
"""
hi = len(paths)
lo = 0
while lo < hi:
mid = (lo+hi)//2
# Grab the dirname for the current dirblock
cur = paths[mid]
if _cmp_path_by_dirblock_py(path, cur) < 0:
hi = mid
else:
lo = mid + 1
return lo
def bisect_dirblock_py(dirblocks, dirname, lo=0, hi=None, cache={}):
"""Return the index where to insert dirname into the dirblocks.
The return value idx is such that all directories blocks in dirblock[:idx]
have names < dirname, and all blocks in dirblock[idx:] have names >=
dirname.
Optional args lo (default 0) and hi (default len(dirblocks)) bound the
slice of a to be searched.
"""
if hi is None:
hi = len(dirblocks)
try:
dirname_split = cache[dirname]
except KeyError:
dirname_split = dirname.split('/')
cache[dirname] = dirname_split
while lo < hi:
mid = (lo + hi) // 2
# Grab the dirname for the current dirblock
cur = dirblocks[mid][0]
try:
cur_split = cache[cur]
except KeyError:
cur_split = cur.split('/')
cache[cur] = cur_split
if cur_split < dirname_split: lo = mid + 1
else: hi = mid
return lo
def cmp_by_dirs_py(path1, path2):
"""Compare two paths directory by directory.
This is equivalent to doing::
cmp(path1.split('/'), path2.split('/'))
The idea is that you should compare path components separately. This
differs from plain ``cmp(path1, path2)`` for paths like ``'a-b'`` and
``a/b``. "a-b" comes after "a" but would come before "a/b" lexically.
:param path1: first path
:param path2: second path
:return: negative number if ``path1`` comes first,
0 if paths are equal,
and positive number if ``path2`` sorts first
"""
if not isinstance(path1, str):
raise TypeError("'path1' must be a plain string, not %s: %r"
% (type(path1), path1))
if not isinstance(path2, str):
raise TypeError("'path2' must be a plain string, not %s: %r"
% (type(path2), path2))
return cmp(path1.split('/'), path2.split('/'))
def _cmp_path_by_dirblock_py(path1, path2):
"""Compare two paths based on what directory they are in.
This generates a sort order, such that all children of a directory are
sorted together, and grandchildren are in the same order as the
children appear. But all grandchildren come after all children.
:param path1: first path
:param path2: the second path
:return: negative number if ``path1`` comes first,
0 if paths are equal
and a positive number if ``path2`` sorts first
"""
if not isinstance(path1, str):
raise TypeError("'path1' must be a plain string, not %s: %r"
% (type(path1), path1))
if not isinstance(path2, str):
raise TypeError("'path2' must be a plain string, not %s: %r"
% (type(path2), path2))
dirname1, basename1 = os.path.split(path1)
key1 = (dirname1.split('/'), basename1)
dirname2, basename2 = os.path.split(path2)
key2 = (dirname2.split('/'), basename2)
return cmp(key1, key2)
def _read_dirblocks_py(state):
"""Read in the dirblocks for the given DirState object.
This is tightly bound to the DirState internal representation. It should be
thought of as a member function, which is only separated out so that we can
re-write it in pyrex.
:param state: A DirState object.
:return: None
"""
state._state_file.seek(state._end_of_header)
text = state._state_file.read()
# TODO: check the crc checksums. crc_measured = zlib.crc32(text)
fields = text.split('\0')
# Remove the last blank entry
trailing = fields.pop()
if trailing != '':
raise errors.DirstateCorrupt(state,
'trailing garbage: %r' % (trailing,))
# consider turning fields into a tuple.
# skip the first field which is the trailing null from the header.
cur = 1
# Each line now has an extra '\n' field which is not used
# so we just skip over it
# entry size:
# 3 fields for the key
# + number of fields per tree_data (5) * tree count
# + newline
num_present_parents = state._num_present_parents()
tree_count = 1 + num_present_parents
entry_size = state._fields_per_entry()
expected_field_count = entry_size * state._num_entries
field_count = len(fields)
# this checks our adjustment, and also catches file too short.
if field_count - cur != expected_field_count:
raise errors.DirstateCorrupt(state,
'field count incorrect %s != %s, entry_size=%s, '\
'num_entries=%s fields=%r' % (
field_count - cur, expected_field_count, entry_size,
state._num_entries, fields))
if num_present_parents == 1:
# Bind external functions to local names
_int = int
# We access all fields in order, so we can just iterate over
# them. Grab an straight iterator over the fields. (We use an
# iterator because we don't want to do a lot of additions, nor
# do we want to do a lot of slicing)
next = iter(fields).next
# Move the iterator to the current position
for x in xrange(cur):
next()
# The two blocks here are deliberate: the root block and the
# contents-of-root block.
state._dirblocks = [('', []), ('', [])]
current_block = state._dirblocks[0][1]
current_dirname = ''
append_entry = current_block.append
for count in xrange(state._num_entries):
dirname = next()
name = next()
file_id = next()
if dirname != current_dirname:
# new block - different dirname
current_block = []
current_dirname = dirname
state._dirblocks.append((current_dirname, current_block))
append_entry = current_block.append
# we know current_dirname == dirname, so re-use it to avoid
# creating new strings
entry = ((current_dirname, name, file_id),
[(# Current Tree
next(), # minikind
next(), # fingerprint
_int(next()), # size
next() == 'y', # executable
next(), # packed_stat or revision_id
),
( # Parent 1
next(), # minikind
next(), # fingerprint
_int(next()), # size
next() == 'y', # executable
next(), # packed_stat or revision_id
),
])
trailing = next()
if trailing != '\n':
raise ValueError("trailing garbage in dirstate: %r" % trailing)
# append the entry to the current block
append_entry(entry)
state._split_root_dirblock_into_contents()
else:
fields_to_entry = state._get_fields_to_entry()
entries = [fields_to_entry(fields[pos:pos+entry_size])
for pos in xrange(cur, field_count, entry_size)]
state._entries_to_current_state(entries)
# To convert from format 2 => format 3
# state._dirblocks = sorted(state._dirblocks,
# key=lambda blk:blk[0].split('/'))
# To convert from format 3 => format 2
# state._dirblocks = sorted(state._dirblocks)
state._dirblock_state = DirState.IN_MEMORY_UNMODIFIED
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