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54f22ed30b
who writes: Here is batch 2, as a big collection of CVS context diffs. Along with moving comments into docstrings, i've added a couple of missing docstrings and attempted to make sure more module docstrings begin with a one-line summary. I did not add docstrings to the methods in profile.py for fear of upsetting any careful optimizations there, though i did move class documentation into class docstrings. The convention i'm using is to leave credits/version/copyright type of stuff in # comments, and move the rest of the descriptive stuff about module usage into module docstrings. Hope this is okay.
93 lines
2.3 KiB
Python
93 lines
2.3 KiB
Python
"""Cache lines from files.
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This is intended to read lines from modules imported -- hence if a filename
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is not found, it will look down the module search path for a file by
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that name.
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"""
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import sys
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import os
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from stat import *
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def getline(filename, lineno):
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lines = getlines(filename)
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if 1 <= lineno <= len(lines):
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return lines[lineno-1]
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else:
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return ''
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# The cache
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cache = {} # The cache
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def clearcache():
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"""Clear the cache entirely."""
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global cache
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cache = {}
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def getlines(filename):
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"""Get the lines for a file from the cache.
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Update the cache if it doesn't contain an entry for this file already."""
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if cache.has_key(filename):
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return cache[filename][2]
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else:
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return updatecache(filename)
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def checkcache():
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"""Discard cache entries that are out of date.
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(This is not checked upon each call!)"""
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for filename in cache.keys():
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size, mtime, lines, fullname = cache[filename]
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try:
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stat = os.stat(fullname)
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except os.error:
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del cache[filename]
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continue
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if size <> stat[ST_SIZE] or mtime <> stat[ST_MTIME]:
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del cache[filename]
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def updatecache(filename):
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"""Update a cache entry and return its list of lines.
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If something's wrong, print a message, discard the cache entry,
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and return an empty list."""
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if cache.has_key(filename):
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del cache[filename]
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if not filename or filename[0] + filename[-1] == '<>':
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return []
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fullname = filename
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try:
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stat = os.stat(fullname)
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except os.error, msg:
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# Try looking through the module search path
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basename = os.path.split(filename)[1]
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for dirname in sys.path:
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fullname = os.path.join(dirname, basename)
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try:
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stat = os.stat(fullname)
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break
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except os.error:
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pass
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else:
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# No luck
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## print '*** Cannot stat', filename, ':', msg
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return []
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try:
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fp = open(fullname, 'r')
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lines = fp.readlines()
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fp.close()
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except IOError, msg:
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## print '*** Cannot open', fullname, ':', msg
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return []
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size, mtime = stat[ST_SIZE], stat[ST_MTIME]
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cache[filename] = size, mtime, lines, fullname
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return lines
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