parsers: remove unused dependency on util

Parsers.py had a reference to util.sha1 which was unused. This commit removes
this reference as well as the unused import of util to simplify the dependency
graph. This is important for the next commit which actually relocates part
of a module to eliminate a cycle.

mercurial/pure/parsers.py

@@ -1,112 +1,110 b''
 # parsers.py - Python implementation of parsers.c
 #
 # Copyright 2009 Matt Mackall <[e-mail]> and others
 #
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 
 from mercurial.node import nullid
-from mercurial import util
 import struct, zlib, cStringIO
 
 _pack = struct.pack
 _unpack = struct.unpack
 _compress = zlib.compress
 _decompress = zlib.decompress
-_sha = util.sha1
 
 # Some code below makes tuples directly because it's more convenient. However,
 # code outside this module should always use dirstatetuple.
 def dirstatetuple(*x):
     # x is a tuple
     return x
 
 def parse_index2(data, inline):
     def gettype(q):
         return int(q & 0xFFFF)
 
     def offset_type(offset, type):
         return long(long(offset) << 16 | type)
 
     indexformatng = ">Qiiiiii20s12x"
 
     s = struct.calcsize(indexformatng)
     index = []
     cache = None
     off = 0
 
     l = len(data) - s
     append = index.append
     if inline:
         cache = (0, data)
         while off <= l:
             e = _unpack(indexformatng, data[off:off + s])
             append(e)
             if e[1] < 0:
                 break
             off += e[1] + s
     else:
         while off <= l:
             e = _unpack(indexformatng, data[off:off + s])
             append(e)
             off += s
 
     if off != len(data):
         raise ValueError('corrupt index file')
 
     if index:
         e = list(index[0])
         type = gettype(e[0])
         e[0] = offset_type(0, type)
         index[0] = tuple(e)
 
     # add the magic null revision at -1
     index.append((0, 0, 0, -1, -1, -1, -1, nullid))
 
     return index, cache
 
 def parse_dirstate(dmap, copymap, st):
     parents = [st[:20], st[20: 40]]
     # dereference fields so they will be local in loop
     format = ">cllll"
     e_size = struct.calcsize(format)
     pos1 = 40
     l = len(st)
 
     # the inner loop
     while pos1 < l:
         pos2 = pos1 + e_size
         e = _unpack(">cllll", st[pos1:pos2]) # a literal here is faster
         pos1 = pos2 + e[4]
         f = st[pos2:pos1]
         if '\0' in f:
             f, c = f.split('\0')
             copymap[f] = c
         dmap[f] = e[:4]
     return parents
 
 def pack_dirstate(dmap, copymap, pl, now):
     now = int(now)
     cs = cStringIO.StringIO()
     write = cs.write
     write("".join(pl))
     for f, e in dmap.iteritems():
         if e[0] == 'n' and e[3] == now:
             # The file was last modified "simultaneously" with the current
             # write to dirstate (i.e. within the same second for file-
             # systems with a granularity of 1 sec). This commonly happens
             # for at least a couple of files on 'update'.
             # The user could change the file without changing its size
             # within the same second. Invalidate the file's mtime in
             # dirstate, forcing future 'status' calls to compare the
             # contents of the file if the size is the same. This prevents
             # mistakenly treating such files as clean.
             e = dirstatetuple(e[0], e[1], e[2], -1)
             dmap[f] = e
 
         if f in copymap:
             f = "%s\0%s" % (f, copymap[f])
         e = _pack(">cllll", e[0], e[1], e[2], e[3], len(f))
         write(e)
         write(f)
     return cs.getvalue()