15 def getline(filename, lineno, module_globals=None):  argument
16     lines = getlines(filename, module_globals)
37 def getlines(filename, module_globals=None):  argument
41     if filename in cache:
42         entry = cache[filename]
44             return cache[filename][2]
47         return updatecache(filename, module_globals)
53 def checkcache(filename=None):  argument
57     if filename is None:
60         if filename in cache:
61             filenames = [filename]
65     for filename in filenames:
66         entry = cache[filename]
76             del cache[filename]
79             del cache[filename]
82 def updatecache(filename, module_globals=None):  argument
87     if filename in cache:
88         if len(cache[filename]) != 1:
89             del cache[filename]
90     if not filename or (filename.startswith('<') and filename.endswith('>')):
93     fullname = filename
97         basename = filename
101         if lazycache(filename, module_globals):
103                 data = cache[filename][0]()
111                 cache[filename] = (
115                 return cache[filename][2]
119         if os.path.isabs(filename):
143     cache[filename] = size, mtime, lines, fullname
147 def lazycache(filename, module_globals):  argument
160     if filename in cache:
161         if len(cache[filename]) == 1:
165     if not filename or (filename.startswith('<') and filename.endswith('>')):
175             cache[filename] = (get_lines,)