Mercurial > cpython-lru_cache-weakref

annotate Lib/lib-old/grep.py @ 4566:6403c94de50d legacy-trunk

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Added safeguard against failure in __del__.
author Guido van Rossum <guido@python.org>
date Wed, 27 Nov 1996 19:39:58 +0000
parents 43c86d1eb22c
children 6c5f7e74fa88
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 # 'grep'
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2
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3 import regex
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4 from regex_syntax import *
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5 import string
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6
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7 opt_show_where = 0
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8 opt_show_filename = 0
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9 opt_show_lineno = 1
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10
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11 def grep(pat, *files):
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12 return ggrep(RE_SYNTAX_GREP, pat, files)
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13
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14 def egrep(pat, *files):
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15 return ggrep(RE_SYNTAX_EGREP, pat, files)
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16
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17 def emgrep(pat, *files):
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18 return ggrep(RE_SYNTAX_EMACS, pat, files)
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19
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20 def ggrep(syntax, pat, files):
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21 if len(files) == 1 and type(files[0]) == type([]):
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22 files = files[0]
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23 global opt_show_filename
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24 opt_show_filename = (len(files) != 1)
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25 syntax = regex.set_syntax(syntax)
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26 try:
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27 prog = regex.compile(pat)
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28 finally:
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29 syntax = regex.set_syntax(syntax)
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30 for filename in files:
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31 fp = open(filename, 'r')
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32 lineno = 0
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33 while 1:
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34 line = fp.readline()
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35 if not line: break
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36 lineno = lineno + 1
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37 if prog.search(line) >= 0:
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38 showline(filename, lineno, line, prog)
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39 fp.close()
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40
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41 def showline(filename, lineno, line, prog):
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42 if line[-1:] == '\n': line = line[:-1]
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43 if opt_show_lineno:
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44 prefix = string.rjust(`lineno`, 3) + ': '
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45 else:
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46 prefix = ''
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47 if opt_show_filename:
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48 prefix = filename + ': ' + prefix
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49 print prefix + line
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50 if opt_show_where:
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51 start, end = prog.regs()[0]
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52 line = line[:start]
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53 if '\t' not in line:
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54 prefix = ' ' * (len(prefix) + start)
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55 else:
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56 prefix = ' ' * len(prefix)
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57 for c in line:
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58 if c <> '\t': c = ' '
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59 prefix = prefix + c
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60 if start == end: prefix = prefix + '\\'
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61 else: prefix = prefix + '^'*(end-start)
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62 print prefix