Mercurial > cpython-lru_cache-weakref

annotate Lib/linecache.py @ 80661:94de77bd0b4b 2.7

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Issue #16194: document imp.load_dynamic problems when read several extension modules from the same binary object file.
author Andrew Svetlov <andrew.svetlov@gmail.com>
date Thu, 29 Nov 2012 19:51:28 +0200
parents 8c8d40ce5ca1
children
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
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11 __all__ = ["getline", "clearcache", "checkcache"]
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12
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13 def getline(filename, lineno, module_globals=None):
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14 lines = getlines(filename, module_globals)
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15 if 1 <= lineno <= len(lines):
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16 return lines[lineno-1]
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17 else:
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18 return ''
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19
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20
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21 # The cache
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22
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23 cache = {} # The cache
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24
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25
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26 def clearcache():
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27 """Clear the cache entirely."""
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28
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29 global cache
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30 cache = {}
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31
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32
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33 def getlines(filename, module_globals=None):
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34 """Get the lines for a file from the cache.
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35 Update the cache if it doesn't contain an entry for this file already."""
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36
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37 if filename in cache:
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38 return cache[filename][2]
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39 else:
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40 return updatecache(filename, module_globals)
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41
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42
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43 def checkcache(filename=None):
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44 """Discard cache entries that are out of date.
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45 (This is not checked upon each call!)"""
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46
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47 if filename is None:
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48 filenames = cache.keys()
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49 else:
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50 if filename in cache:
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51 filenames = [filename]
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52 else:
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53 return
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54
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55 for filename in filenames:
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56 size, mtime, lines, fullname = cache[filename]
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57 if mtime is None:
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58 continue # no-op for files loaded via a __loader__
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59 try:
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60 stat = os.stat(fullname)
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61 except os.error:
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62 del cache[filename]
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63 continue
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64 if size != stat.st_size or mtime != stat.st_mtime:
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65 del cache[filename]
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67
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68 def updatecache(filename, module_globals=None):
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69 """Update a cache entry and return its list of lines.
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70 If something's wrong, print a message, discard the cache entry,
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71 and return an empty list."""
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72
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73 if filename in cache:
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74 del cache[filename]
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75 if not filename or (filename.startswith('<') and filename.endswith('>')):
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76 return []
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77
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78 fullname = filename
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79 try:
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80 stat = os.stat(fullname)
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81 except OSError:
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82 basename = filename
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83
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84 # Try for a __loader__, if available
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85 if module_globals and '__loader__' in module_globals:
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86 name = module_globals.get('__name__')
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87 loader = module_globals['__loader__']
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88 get_source = getattr(loader, 'get_source', None)
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89
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90 if name and get_source:
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91 try:
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92 data = get_source(name)
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93 except (ImportError, IOError):
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94 pass
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95 else:
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96 if data is None:
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97 # No luck, the PEP302 loader cannot find the source
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98 # for this module.
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99 return []
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100 cache[filename] = (
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101 len(data), None,
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102 [line+'\n' for line in data.splitlines()], fullname
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103 )
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104 return cache[filename][2]
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105
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106 # Try looking through the module search path, which is only useful
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107 # when handling a relative filename.
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108 if os.path.isabs(filename):
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109 return []
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110
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111 for dirname in sys.path:
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112 # When using imputil, sys.path may contain things other than
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113 # strings; ignore them when it happens.
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114 try:
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115 fullname = os.path.join(dirname, basename)
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116 except (TypeError, AttributeError):
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117 # Not sufficiently string-like to do anything useful with.
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118 continue
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119 try:
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120 stat = os.stat(fullname)
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121 break
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122 except os.error:
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123 pass
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124 else:
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125 return []
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126 try:
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127 with open(fullname, 'rU') as fp:
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128 lines = fp.readlines()
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129 except IOError:
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130 return []
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diff changeset
131 if lines and not lines[-1].endswith('\n'):
f05d2996776e ensure the last line has a trailing newline #8782
Benjamin Peterson <benjamin@python.org>
parents: 54350
diff changeset
132 lines[-1] += '\n'
23625
65cf478950ff Replaced obsolete stat module constants with equivalent attributes
Raymond Hettinger <python@rcn.com>
parents: 23620
diff changeset
133 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
134 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
135 return lines