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dirstate.read: make 15% faster.

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time to read dirstate for my kernel repo goes from 0.22s to 0.18s.
This commit is contained in:
Vadim Gelfer 2006-06-12 22:09:50 -07:00
parent d3100d1f2c
commit a7a6090062
1 changed files with 22 additions and 12 deletions
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34
mercurial/dirstate.py
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@ -155,31 +155,41 @@ class dirstate(object):
if self.map is None:
self.read()
def read(self):
self.map = {}
self.pl = [nullid, nullid]
try:
st = self.opener("dirstate").read()
if not st: return
except: return
def parse(self, st):
self.pl = [st[:20], st[20: 40]]
# deref fields so they will be local in loop
map = self.map
copies = self.copies
format = self.format
unpack = struct.unpack
pos = 40
e_size = struct.calcsize(self.format)
e_size = struct.calcsize(format)
while pos < len(st):
newpos = pos + e_size
e = struct.unpack(self.format, st[pos:newpos])
e = unpack(format, st[pos:newpos])
l = e[4]
pos = newpos
newpos = pos + l
f = st[pos:newpos]
if '\0' in f:
f, c = f.split('\0')
self.copies[f] = c
self.map[f] = e[:4]
copies[f] = c
map[f] = e[:4]
pos = newpos
def read(self):
self.map = {}
self.pl = [nullid, nullid]
try:
st = self.opener("dirstate").read()
if st:
self.parse(st)
except IOError, err:
if err.errno != errno.ENOENT: raise
def copy(self, source, dest):
self.lazyread()
self.markdirty()