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import sys
import os
import string
class BackwardsReader:
""" Stripped and stolen from : http://code.activestate.com/recipes/120686-read-a-text-file-backwards/ """
def readline(self):
while len(self.data) == 1 and ((self.blkcount * self.blksize) < self.size):
self.blkcount = self.blkcount + 1
line = self.data[0]
try:
self.f.seek(-self.blksize * self.blkcount, 2)
self.data = string.split(self.f.read(self.blksize) + line, '\n')
except IOError:
self.f.seek(0)
self.data = string.split(self.f.read(self.size - (self.blksize * (self.blkcount-1))) + line, '\n')
if len(self.data) == 0:
return ""
line = self.data[-1]
self.data = self.data[:-1]
return line + '\n'
def __init__(self, file, blksize=4096):
"""initialize the internal structures"""
self.size = os.stat(file)[6]
self.blksize = blksize
self.blkcount = 1
self.f = open(file, 'rb')
if self.size > self.blksize:
self.f.seek(-self.blksize * self.blkcount, 2)
self.data = string.split(self.f.read(self.blksize), '\n')
if not self.data[-1]:
self.data = self.data[:-1]
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