Mercurial > cpython-lru_cache-weakref

annotate Tools/scripts/rgrep.py @ 25838:8540887bcec6 2.2

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Backport of 2.183: Fix memory leak in add_subclass() found by NealN with valgrind.
author Guido van Rossum <guido@python.org>
date Fri, 18 Oct 2002 13:42:21 +0000
parents 0398051f8ffa
children 8a7a2f1f88f0
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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0398051f8ffa New tool: reverse grep (greps from the end). Uses a fairly efficient
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1 #! /usr/bin/env python
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2
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3 """Reverse grep.
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4
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5 Usage: rgrep [-i] pattern file
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6 """
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7
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8 import sys
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9 import re
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10 import string
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11 import getopt
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12
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13 def main():
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14 bufsize = 64*1024
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15 reflags = 0
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16 opts, args = getopt.getopt(sys.argv[1:], "i")
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17 for o, a in opts:
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18 if o == '-i':
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19 reflags = reflags | re.IGNORECASE
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20 if len(args) < 2:
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21 usage("not enough arguments")
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22 if len(args) > 2:
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23 usage("exactly one file argument required")
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24 pattern, filename = args
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25 try:
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26 prog = re.compile(pattern, reflags)
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27 except re.error, msg:
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28 usage("error in regular expression: %s" % str(msg))
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29 try:
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30 f = open(filename)
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31 except IOError, msg:
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32 usage("can't open %s: %s" % (repr(filename), str(msg)), 1)
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33 f.seek(0, 2)
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34 pos = f.tell()
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35 leftover = None
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36 while pos > 0:
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37 size = min(pos, bufsize)
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38 pos = pos - size
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39 f.seek(pos)
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40 buffer = f.read(size)
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41 lines = string.split(buffer, "\n")
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42 del buffer
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43 if leftover is None:
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44 if not lines[-1]:
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45 del lines[-1]
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46 else:
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47 lines[-1] = lines[-1] + leftover
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48 if pos > 0:
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49 leftover = lines[0]
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50 del lines[0]
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51 else:
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52 leftover = None
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53 lines.reverse()
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54 for line in lines:
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55 if prog.search(line):
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56 print line
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57
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58 def usage(msg, code=2):
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59 sys.stdout = sys.stderr
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60 print msg
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61 print __doc__
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62 sys.exit(code)
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63
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64 if __name__ == '__main__':
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65 main()