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Commit Description:
Merge pull request #17 from nattee/master...
Commit Description:
Merge pull request #17 from nattee/master
upgrade to current working snapshot
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lib/assets/Lib/linecache.py
| 134 lines
| 3.9 KiB
| text/x-python
| PythonLexer
|
| r584 | """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 | ||||
| import tokenize | ||||
| __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] | ||||
| else: | ||||
| return updatecache(filename, module_globals) | ||||
| def checkcache(filename=None): | ||||
| """Discard cache entries that are out of date. | ||||
| (This is not checked upon each call!)""" | ||||
| if filename is None: | ||||
| filenames = list(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: | ||||
| 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 tokenize.open(fullname) 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 | ||||