Mercurial > cpython-lru_cache-weakref

annotate Lib/linecache.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 2a94bf235daa
children 8291473fde3e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 from stat import *
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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):
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15 lines = getlines(filename)
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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):
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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 cache.has_key(filename):
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39 return cache[filename][2]
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40 else:
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41 return updatecache(filename)
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42
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43
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44 def checkcache():
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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 for filename in cache.keys():
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49 size, mtime, lines, fullname = cache[filename]
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50 try:
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51 stat = os.stat(fullname)
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52 except os.error:
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53 del cache[filename]
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54 continue
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55 if size != stat[ST_SIZE] or mtime != stat[ST_MTIME]:
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56 del cache[filename]
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57
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58
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59 def updatecache(filename):
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60 """Update a cache entry and return its list of lines.
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61 If something's wrong, print a message, discard the cache entry,
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62 and return an empty list."""
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63
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64 if cache.has_key(filename):
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65 del cache[filename]
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66 if not filename or filename[0] + filename[-1] == '<>':
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67 return []
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68 fullname = filename
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69 try:
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70 stat = os.stat(fullname)
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71 except os.error, msg:
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72 # Try looking through the module search path.
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73 basename = os.path.split(filename)[1]
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74 for dirname in sys.path:
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75 # When using imputil, sys.path may contain things other than
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76 # strings; ignore them when it happens.
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77 try:
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78 fullname = os.path.join(dirname, basename)
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79 except (TypeError, AttributeError):
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80 # Not sufficiently string-like to do anything useful with.
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81 pass
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82 else:
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83 try:
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84 stat = os.stat(fullname)
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85 break
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86 except os.error:
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87 pass
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88 else:
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89 # No luck
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90 ## print '*** Cannot stat', filename, ':', msg
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91 return []
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92 try:
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93 fp = open(fullname, 'r')
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94 lines = fp.readlines()
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95 fp.close()
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96 except IOError, msg:
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97 ## print '*** Cannot open', fullname, ':', msg
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98 return []
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99 size, mtime = stat[ST_SIZE], stat[ST_MTIME]
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100 cache[filename] = size, mtime, lines, fullname
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101 return lines