Mercurial > cpython-lru_cache-weakref

annotate Lib/linecache.py @ 5817:48b94de85bf3 legacy-trunk

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Extensive changes by AMK.
author Guido van Rossum <guido@python.org>
date Thu, 17 Jul 1997 16:29:42 +0000
parents c5cb3a53933c
children b6f52c1ef6da
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 # This is intended to read lines from modules imported -- hence if a filename
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3 # is not found, it will look down the module search path for a file by
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4 # that name.
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5
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6 import sys
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7 import os
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8 from stat import *
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9
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10 def getline(filename, lineno):
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11 lines = getlines(filename)
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12 if 1 <= lineno <= len(lines):
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13 return lines[lineno-1]
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14 else:
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15 return ''
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16
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17
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18 # The cache
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19
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20 cache = {} # The cache
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21
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22
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23 # Clear the cache entirely
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24
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25 def clearcache():
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26 global cache
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27 cache = {}
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28
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29
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30 # Get the lines for a file from the cache.
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31 # Update the cache if it doesn't contain an entry for this file already.
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32
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33 def getlines(filename):
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34 if cache.has_key(filename):
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35 return cache[filename][2]
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36 else:
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37 return updatecache(filename)
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38
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39
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40 # Discard cache entries that are out of date.
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41 # (This is not checked upon each call!)
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42
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43 def checkcache():
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44 for filename in cache.keys():
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45 size, mtime, lines, fullname = cache[filename]
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46 try:
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47 stat = os.stat(fullname)
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48 except os.error:
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49 del cache[filename]
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50 continue
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51 if size <> stat[ST_SIZE] or mtime <> stat[ST_MTIME]:
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52 del cache[filename]
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53
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54
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55 # Update a cache entry and return its list of lines.
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56 # If something's wrong, print a message, discard the cache entry,
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57 # and return an empty list.
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58
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59 def updatecache(filename):
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60 if cache.has_key(filename):
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61 del cache[filename]
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62 if not filename or filename[0] + filename[-1] == '<>':
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63 return []
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64 fullname = filename
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65 try:
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66 stat = os.stat(fullname)
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67 except os.error, msg:
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68 # Try looking through the module search path
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69 basename = os.path.split(filename)[1]
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70 for dirname in sys.path:
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71 fullname = os.path.join(dirname, basename)
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72 try:
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73 stat = os.stat(fullname)
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74 break
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75 except os.error:
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76 pass
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77 else:
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78 # No luck
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79 ## print '*** Cannot stat', filename, ':', msg
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80 return []
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81 try:
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82 fp = open(fullname, 'r')
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83 lines = fp.readlines()
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84 fp.close()
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85 except IOError, msg:
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86 ## print '*** Cannot open', fullname, ':', msg
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87 return []
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88 size, mtime = stat[ST_SIZE], stat[ST_MTIME]
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89 cache[filename] = size, mtime, lines, fullname
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90 return lines