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SF bug #690377: Dud footnote reference in distutils docs
author Raymond Hettinger <python@rcn.com>
date Fri, 21 Feb 2003 02:47:09 +0000
parents 8a7a2f1f88f0
children 93c92f20b6bf
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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73758db2f464 /usr/local/bin/python -> /usr/bin/env python
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1 #! /usr/bin/env python
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2
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3 # Selectively preprocess #ifdef / #ifndef statements.
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4 # Usage:
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5 # ifdef [-Dname] ... [-Uname] ... [file] ...
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6 #
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7 # This scans the file(s), looking for #ifdef and #ifndef preprocessor
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8 # commands that test for one of the names mentioned in the -D and -U
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9 # options. On standard output it writes a copy of the input file(s)
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10 # minus those code sections that are suppressed by the selected
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11 # combination of defined/undefined symbols. The #if(n)def/#else/#else
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12 # lines themselfs (if the #if(n)def tests for one of the mentioned
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13 # names) are removed as well.
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14
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15 # Features: Arbitrary nesting of recognized and unrecognized
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16 # preprocesor statements works correctly. Unrecognized #if* commands
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17 # are left in place, so it will never remove too much, only too
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18 # little. It does accept whitespace around the '#' character.
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19
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20 # Restrictions: There should be no comments or other symbols on the
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21 # #if(n)def lines. The effect of #define/#undef commands in the input
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22 # file or in included files is not taken into account. Tests using
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23 # #if and the defined() pseudo function are not recognized. The #elif
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24 # command is not recognized. Improperly nesting is not detected.
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25 # Lines that look like preprocessor commands but which are actually
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26 # part of comments or string literals will be mistaken for
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27 # preprocessor commands.
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28
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29 import sys
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30 import regex
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31 import getopt
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32
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33 defs = []
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34 undefs = []
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35
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36 def main():
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37 opts, args = getopt.getopt(sys.argv[1:], 'D:U:')
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38 for o, a in opts:
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39 if o == '-D':
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40 defs.append(a)
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41 if o == '-U':
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42 undefs.append(a)
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43 if not args:
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44 args = ['-']
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45 for file in args:
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46 if file == '-':
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47 process(sys.stdin, sys.stdout)
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48 else:
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49 f = open(file, 'r')
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50 process(f, sys.stdout)
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51 f.close()
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52
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53 def process(fpi, fpo):
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54 keywords = ('if', 'ifdef', 'ifndef', 'else', 'endif')
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55 ok = 1
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56 stack = []
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57 while 1:
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58 line = fpi.readline()
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59 if not line: break
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60 while line[-2:] == '\\\n':
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61 nextline = fpi.readline()
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62 if not nextline: break
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63 line = line + nextline
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64 tmp = line.strip()
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65 if tmp[:1] != '#':
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66 if ok: fpo.write(line)
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67 continue
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68 tmp = tmp[1:].strip()
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69 words = tmp.split()
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70 keyword = words[0]
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71 if keyword not in keywords:
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72 if ok: fpo.write(line)
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73 continue
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74 if keyword in ('ifdef', 'ifndef') and len(words) == 2:
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75 if keyword == 'ifdef':
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76 ko = 1
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77 else:
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78 ko = 0
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79 word = words[1]
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80 if word in defs:
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81 stack.append((ok, ko, word))
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82 if not ko: ok = 0
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83 elif word in undefs:
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84 stack.append((ok, not ko, word))
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85 if ko: ok = 0
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86 else:
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87 stack.append((ok, -1, word))
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88 if ok: fpo.write(line)
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89 elif keyword == 'if':
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90 stack.append((ok, -1, ''))
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91 if ok: fpo.write(line)
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92 elif keyword == 'else' and stack:
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93 s_ok, s_ko, s_word = stack[-1]
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94 if s_ko < 0:
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95 if ok: fpo.write(line)
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96 else:
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97 s_ko = not s_ko
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98 ok = s_ok
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99 if not s_ko: ok = 0
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100 stack[-1] = s_ok, s_ko, s_word
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101 elif keyword == 'endif' and stack:
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102 s_ok, s_ko, s_word = stack[-1]
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103 if s_ko < 0:
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104 if ok: fpo.write(line)
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105 del stack[-1]
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106 ok = s_ok
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107 else:
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108 sys.stderr.write('Unknown keyword %s\n' % keyword)
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109 if stack:
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110 sys.stderr.write('stack: %s\n' % stack)
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111
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112 main()