# manifest.py - manifest revision class for mercurial
#
# Copyright 2005 Matt Mackall <mpm@selenic.com>
#
# This software may be used and distributed according to the terms
# of the GNU General Public License, incorporated herein by reference.
from revlog import *
from i18n import gettext as _
from demandload import *
demandload(globals(), "array bisect struct")
class manifest(revlog):
def __init__(self, opener, defversion=REVLOGV0):
self.mapcache = None
self.listcache = None
revlog.__init__(self, opener, "00manifest.i", "00manifest.d",
defversion)
def read(self, node):
if node == nullid: return {} # don't upset local cache
if self.mapcache and self.mapcache[0] == node:
return self.mapcache[1]
text = self.revision(node)
map = {}
flag = {}
self.listcache = array.array('c', text)
lines = text.splitlines(1)
for l in lines:
(f, n) = l.split('\0')
map[f] = bin(n[:40])
flag[f] = (n[40:-1] == "x")
self.mapcache = (node, map, flag)
return map
def readflags(self, node):
if node == nullid: return {} # don't upset local cache
if not self.mapcache or self.mapcache[0] != node:
self.read(node)
return self.mapcache[2]
def diff(self, a, b):
return mdiff.textdiff(str(a), str(b))
def _search(self, m, s, lo=0, hi=None):
'''return a tuple (start, end) that says where to find s within m.
If the string is found m[start:end] are the line containing
that string. If start == end the string was not found and
they indicate the proper sorted insertion point. This was
taken from bisect_left, and modified to find line start/end as
it goes along.
m should be a buffer or a string
s is a string'''
def advance(i, c):
while i < lenm and m[i] != c:
i += 1
return i
lenm = len(m)
if not hi:
hi = lenm
while lo < hi:
mid = (lo + hi) // 2
start = mid
while start > 0 and m[start-1] != '\n':
start -= 1
end = advance(start, '\0')
if m[start:end] < s:
# we know that after the null there are 40 bytes of sha1
# this translates to the bisect lo = mid + 1
lo = advance(end + 40, '\n') + 1
else:
# this translates to the bisect hi = mid
hi = start
end = advance(lo, '\0')
found = m[lo:end]
if cmp(s, found) == 0:
# we know that after the null there are 40 bytes of sha1
end = advance(end + 40, '\n')
return (lo, end+1)
else:
return (lo, lo)
def find(self, node, f):
'''look up entry for a single file efficiently.
return (node, flag) pair if found, (None, None) if not.'''
if self.mapcache and node == self.mapcache[0]:
return self.mapcache[1].get(f), self.mapcache[2].get(f)
text = self.revision(node)
start, end = self._search(text, f)
if start == end:
return None, None
l = text[start:end]
f, n = l.split('\0')
return bin(n[:40]), n[40:-1] == 'x'
def add(self, map, flags, transaction, link, p1=None, p2=None,
changed=None):
# apply the changes collected during the bisect loop to our addlist
# return a delta suitable for addrevision
def addlistdelta(addlist, x):
# start from the bottom up
# so changes to the offsets don't mess things up.
i = len(x)
while i > 0:
i -= 1
start = x[i][0]
end = x[i][1]
if x[i][2]:
addlist[start:end] = array.array('c', x[i][2])
else:
del addlist[start:end]
return "".join([struct.pack(">lll", d[0], d[1], len(d[2])) + d[2] \
for d in x ])
# if we're using the listcache, make sure it is valid and
# parented by the same node we're diffing against
if not changed or not self.listcache or not p1 or \
self.mapcache[0] != p1:
files = map.keys()
files.sort()
# if this is changed to support newlines in filenames,
# be sure to check the templates/ dir again (especially *-raw.tmpl)
text = ["%s\000%s%s\n" %
(f, hex(map[f]), flags[f] and "x" or '')
for f in files]
self.listcache = array.array('c', "".join(text))
cachedelta = None
else:
addlist = self.listcache
# combine the changed lists into one list for sorting
work = [[x, 0] for x in changed[0]]
work[len(work):] = [[x, 1] for x in changed[1]]
work.sort()
delta = []
dstart = None
dend = None
dline = [""]
start = 0
# zero copy representation of addlist as a buffer
addbuf = buffer(addlist)
# start with a readonly loop that finds the offset of
# each line and creates the deltas
for w in work:
f = w[0]
# bs will either be the index of the item or the insert point
start, end = self._search(addbuf, f, start)
if w[1] == 0:
l = "%s\000%s%s\n" % (f, hex(map[f]),
flags[f] and "x" or '')
else:
l = ""
if start == end and w[1] == 1:
# item we want to delete was not found, error out
raise AssertionError(
_("failed to remove %s from manifest\n") % f)
if dstart != None and dstart <= start and dend >= start:
if dend < end:
dend = end
if l:
dline.append(l)
else:
if dstart != None:
delta.append([dstart, dend, "".join(dline)])
dstart = start
dend = end
dline = [l]
if dstart != None:
delta.append([dstart, dend, "".join(dline)])
# apply the delta to the addlist, and get a delta for addrevision
cachedelta = addlistdelta(addlist, delta)
# the delta is only valid if we've been processing the tip revision
if self.mapcache[0] != self.tip():
cachedelta = None
self.listcache = addlist
n = self.addrevision(buffer(self.listcache), transaction, link, p1, \
p2, cachedelta)
self.mapcache = (n, map, flags)
return n