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author | rahulp13 | 2020-03-17 14:55:41 +0530 |
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committer | rahulp13 | 2020-03-17 14:55:41 +0530 |
commit | 296443137f4288cb030e92859ccfbe3204bc1088 (patch) | |
tree | ca4798c2da1e7244edc3bc108d81b462b537aea2 /lib/python2.7/linecache.py | |
parent | 0db48f6533517ecebfd9f0693f89deca28408b76 (diff) | |
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initial commit
Diffstat (limited to 'lib/python2.7/linecache.py')
-rw-r--r-- | lib/python2.7/linecache.py | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/lib/python2.7/linecache.py b/lib/python2.7/linecache.py new file mode 100644 index 0000000..4b97be3 --- /dev/null +++ b/lib/python2.7/linecache.py @@ -0,0 +1,139 @@ +"""Cache lines from files. + +This is intended to read lines from modules imported -- hence if a filename +is not found, it will look down the module search path for a file by +that name. +""" + +import sys +import os + +__all__ = ["getline", "clearcache", "checkcache"] + +def getline(filename, lineno, module_globals=None): + lines = getlines(filename, module_globals) + if 1 <= lineno <= len(lines): + return lines[lineno-1] + else: + return '' + + +# The cache + +cache = {} # The cache + + +def clearcache(): + """Clear the cache entirely.""" + + global cache + cache = {} + + +def getlines(filename, module_globals=None): + """Get the lines for a file from the cache. + Update the cache if it doesn't contain an entry for this file already.""" + + if filename in cache: + return cache[filename][2] + + try: + return updatecache(filename, module_globals) + except MemoryError: + clearcache() + return [] + + +def checkcache(filename=None): + """Discard cache entries that are out of date. + (This is not checked upon each call!)""" + + if filename is None: + filenames = cache.keys() + else: + if filename in cache: + filenames = [filename] + else: + return + + for filename in filenames: + size, mtime, lines, fullname = cache[filename] + if mtime is None: + continue # no-op for files loaded via a __loader__ + try: + stat = os.stat(fullname) + except os.error: + del cache[filename] + continue + if size != stat.st_size or mtime != stat.st_mtime: + del cache[filename] + + +def updatecache(filename, module_globals=None): + """Update a cache entry and return its list of lines. + If something's wrong, print a message, discard the cache entry, + and return an empty list.""" + + if filename in cache: + del cache[filename] + if not filename or (filename.startswith('<') and filename.endswith('>')): + return [] + + fullname = filename + try: + stat = os.stat(fullname) + except OSError: + basename = filename + + # Try for a __loader__, if available + if module_globals and '__loader__' in module_globals: + name = module_globals.get('__name__') + loader = module_globals['__loader__'] + get_source = getattr(loader, 'get_source', None) + + if name and get_source: + try: + data = get_source(name) + except (ImportError, IOError): + pass + else: + if data is None: + # No luck, the PEP302 loader cannot find the source + # for this module. + return [] + cache[filename] = ( + len(data), None, + [line+'\n' for line in data.splitlines()], fullname + ) + return cache[filename][2] + + # Try looking through the module search path, which is only useful + # when handling a relative filename. + if os.path.isabs(filename): + return [] + + for dirname in sys.path: + # When using imputil, sys.path may contain things other than + # strings; ignore them when it happens. + try: + fullname = os.path.join(dirname, basename) + except (TypeError, AttributeError): + # Not sufficiently string-like to do anything useful with. + continue + try: + stat = os.stat(fullname) + break + except os.error: + pass + else: + return [] + try: + with open(fullname, 'rU') as fp: + lines = fp.readlines() + except IOError: + return [] + if lines and not lines[-1].endswith('\n'): + lines[-1] += '\n' + size, mtime = stat.st_size, stat.st_mtime + cache[filename] = size, mtime, lines, fullname + return lines |