python-2.5.2/win32/Lib/linecache.py
author jjkang
Fri, 11 Jun 2010 15:22:40 +0800
changeset 2 9da1e5517a66
parent 0 ae805ac0140d
permissions -rw-r--r--
Change SFL to EPL
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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"""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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__all__ = ["getline", "clearcache", "checkcache"]
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def getline(filename, lineno, module_globals=None):
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    lines = getlines(filename, module_globals)
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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, module_globals=None):
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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 filename in cache:
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        return cache[filename][2]
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    else:
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        return updatecache(filename, module_globals)
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def checkcache(filename=None):
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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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    if filename is None:
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        filenames = cache.keys()
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    else:
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        if filename in cache:
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            filenames = [filename]
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        else:
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            return
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    for filename in filenames:
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        size, mtime, lines, fullname = cache[filename]
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        if mtime is None:
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            continue   # no-op for files loaded via a __loader__
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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, module_globals=None):
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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 filename in cache:
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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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        basename = os.path.split(filename)[1]
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        # Try for a __loader__, if available
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        if module_globals and '__loader__' in module_globals:
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            name = module_globals.get('__name__')
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            loader = module_globals['__loader__']
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            get_source = getattr(loader, 'get_source', None)
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            if name and get_source:
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                if basename.startswith(name.split('.')[-1]+'.'):
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                    try:
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                        data = get_source(name)
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                    except (ImportError, IOError):
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                        pass
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                    else:
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                        if data is None:
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                            # No luck, the PEP302 loader cannot find the source
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                            # for this module.
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                            return []
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                        cache[filename] = (
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                            len(data), None,
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                            [line+'\n' for line in data.splitlines()], fullname
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                        )
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                        return cache[filename][2]
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        # Try looking through the module search path.
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        for dirname in sys.path:
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            # When using imputil, sys.path may contain things other than
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            # strings; ignore them when it happens.
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            try:
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                fullname = os.path.join(dirname, basename)
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            except (TypeError, AttributeError):
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                # Not sufficiently string-like to do anything useful with.
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                pass
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            else:
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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, 'rU')
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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