3 This is intended to read lines from modules imported -- hence if a filename
21 def getline(filename, lineno, module_globals=None):  argument
25     lines = getlines(filename, module_globals)
27         return lines[lineno - 1]
31 def getlines(filename, module_globals=None):  argument
35     if filename in cache:
36         entry = cache[filename]
38             return cache[filename][2]
41         return updatecache(filename, module_globals)
47 def checkcache(filename=None):  argument
51     if filename is None:
53     elif filename in cache:
54         filenames = [filename]
58     for filename in filenames:
59         entry = cache[filename]
65             continue   # no-op for files loaded via a __loader__
74             cache.pop(filename, None)
77             cache.pop(filename, None)
80 def updatecache(filename, module_globals=None):  argument
92     if filename in cache:
93         if len(cache[filename]) != 1:
94             cache.pop(filename, None)
95     if not filename or (filename.startswith('<') and filename.endswith('>')):
98     fullname = filename
102         basename = filename
106         if lazycache(filename, module_globals):
108                 data = cache[filename][0]()
116                 cache[filename] = (
122                 return cache[filename][2]
125         # when handling a relative filename.
126         if os.path.isabs(filename):
133                 # Not sufficiently string-like to do anything useful with.
151     elif not lines[-1].endswith('\n'):
152         lines[-1] += '\n'
154     cache[filename] = size, mtime, lines, fullname
158 def lazycache(filename, module_globals):  argument
159     """Seed the cache for filename with module_globals.
168         get_source method must be found, the filename must be a cacheable
169         filename, and the filename must not be already cached.
171     if filename in cache:
172         if len(cache[filename]) == 1:
176     if not filename or (filename.startswith('<') and filename.endswith('>')):
190             cache[filename] = (get_lines,)