Mercurial > cpython-lru_cache-weakref

annotate Lib/linecache.py @ 84007:dbfbdf2b5c19 3.3

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Fix #17967: For ftp urls CWD to target instead of hopping to each directory towards target. This fixes a bug where target is accessible, but parent directories are restricted.
author Senthil Kumaran <senthil@uthcode.com>
date Sat, 01 Jun 2013 08:27:06 -0700
parents 306339c31758
children 47f98a550d42
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 """Cache lines from files.
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2
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3 This is intended to read lines from modules imported -- hence if a filename
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4 is not found, it will look down the module search path for a file by
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5 that name.
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6 """
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7
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8 import sys
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9 import os
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10 import tokenize
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11
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12 __all__ = ["getline", "clearcache", "checkcache"]
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13
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14 def getline(filename, lineno, module_globals=None):
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15 lines = getlines(filename, module_globals)
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16 if 1 <= lineno <= len(lines):
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17 return lines[lineno-1]
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18 else:
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19 return ''
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20
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21
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22 # The cache
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23
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24 cache = {} # The cache
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25
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26
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27 def clearcache():
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28 """Clear the cache entirely."""
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29
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30 global cache
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31 cache = {}
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32
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33
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34 def getlines(filename, module_globals=None):
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35 """Get the lines for a file from the cache.
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36 Update the cache if it doesn't contain an entry for this file already."""
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37
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38 if filename in cache:
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39 return cache[filename][2]
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40 else:
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41 return updatecache(filename, module_globals)
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42
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43
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44 def checkcache(filename=None):
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45 """Discard cache entries that are out of date.
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46 (This is not checked upon each call!)"""
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47
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48 if filename is None:
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49 filenames = list(cache.keys())
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50 else:
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51 if filename in cache:
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52 filenames = [filename]
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53 else:
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54 return
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55
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56 for filename in filenames:
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57 size, mtime, lines, fullname = cache[filename]
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58 if mtime is None:
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59 continue # no-op for files loaded via a __loader__
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60 try:
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61 stat = os.stat(fullname)
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62 except os.error:
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63 del cache[filename]
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64 continue
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65 if size != stat.st_size or mtime != stat.st_mtime:
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66 del cache[filename]
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67
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68
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69 def updatecache(filename, module_globals=None):
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70 """Update a cache entry and return its list of lines.
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71 If something's wrong, print a message, discard the cache entry,
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72 and return an empty list."""
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73
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74 if filename in cache:
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75 del cache[filename]
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76 if not filename or (filename.startswith('<') and filename.endswith('>')):
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77 return []
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78
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79 fullname = filename
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80 try:
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81 stat = os.stat(fullname)
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82 except OSError:
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83 basename = filename
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84
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85 # Try for a __loader__, if available
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86 if module_globals and '__loader__' in module_globals:
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87 name = module_globals.get('__name__')
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88 loader = module_globals['__loader__']
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89 get_source = getattr(loader, 'get_source', None)
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90
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91 if name and get_source:
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92 try:
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93 data = get_source(name)
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94 except (ImportError, IOError):
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95 pass
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96 else:
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97 if data is None:
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98 # No luck, the PEP302 loader cannot find the source
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99 # for this module.
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100 return []
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101 cache[filename] = (
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102 len(data), None,
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103 [line+'\n' for line in data.splitlines()], fullname
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104 )
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105 return cache[filename][2]
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106
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107 # Try looking through the module search path, which is only useful
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108 # when handling a relative filename.
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109 if os.path.isabs(filename):
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110 return []
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111
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112 for dirname in sys.path:
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113 try:
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114 fullname = os.path.join(dirname, basename)
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115 except (TypeError, AttributeError):
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116 # Not sufficiently string-like to do anything useful with.
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117 continue
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118 try:
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119 stat = os.stat(fullname)
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120 break
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121 except os.error:
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122 pass
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123 else:
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124 return []
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125 try:
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126 with tokenize.open(fullname) as fp:
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127 lines = fp.readlines()
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128 except IOError:
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129 return []
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130 if lines and not lines[-1].endswith('\n'):
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131 lines[-1] += '\n'
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132 size, mtime = stat.st_size, stat.st_mtime
11706
b6f52c1ef6da More trivial comment -> docstring transformations by Ka-Ping Yee,
Guido van Rossum <guido@python.org>
parents: 2954
diff changeset
133 cache[filename] = size, mtime, lines, fullname
b6f52c1ef6da More trivial comment -> docstring transformations by Ka-Ping Yee,
Guido van Rossum <guido@python.org>
parents: 2954
diff changeset
134 return lines