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                <textarea name="file_content" style="width:100%; height:400px; font-family:monospace;">&quot;&quot;&quot;Cache lines from Python source 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.
&quot;&quot;&quot;

import functools
import sys
import os
import tokenize

__all__ = [&quot;getline&quot;, &quot;clearcache&quot;, &quot;checkcache&quot;, &quot;lazycache&quot;]


# The cache. Maps filenames to either a thunk which will provide source code,
# or a tuple (size, mtime, lines, fullname) once loaded.
cache = {}


def clearcache():
    &quot;&quot;&quot;Clear the cache entirely.&quot;&quot;&quot;
    cache.clear()


def getline(filename, lineno, module_globals=None):
    &quot;&quot;&quot;Get a line for a Python source file from the cache.
    Update the cache if it doesn&#039;t contain an entry for this file already.&quot;&quot;&quot;

    lines = getlines(filename, module_globals)
    if 1 &lt;= lineno &lt;= len(lines):
        return lines[lineno - 1]
    return &#039;&#039;


def getlines(filename, module_globals=None):
    &quot;&quot;&quot;Get the lines for a Python source file from the cache.
    Update the cache if it doesn&#039;t contain an entry for this file already.&quot;&quot;&quot;

    if filename in cache:
        entry = cache[filename]
        if len(entry) != 1:
            return cache[filename][2]

    try:
        return updatecache(filename, module_globals)
    except MemoryError:
        clearcache()
        return []


def checkcache(filename=None):
    &quot;&quot;&quot;Discard cache entries that are out of date.
    (This is not checked upon each call!)&quot;&quot;&quot;

    if filename is None:
        # get keys atomically
        filenames = cache.copy().keys()
    else:
        filenames = [filename]

    for filename in filenames:
        try:
            entry = cache[filename]
        except KeyError:
            continue

        if len(entry) == 1:
            # lazy cache entry, leave it lazy.
            continue
        size, mtime, lines, fullname = entry
        if mtime is None:
            continue   # no-op for files loaded via a __loader__
        try:
            stat = os.stat(fullname)
        except (OSError, ValueError):
            cache.pop(filename, None)
            continue
        if size != stat.st_size or mtime != stat.st_mtime:
            cache.pop(filename, None)


def updatecache(filename, module_globals=None):
    &quot;&quot;&quot;Update a cache entry and return its list of lines.
    If something&#039;s wrong, print a message, discard the cache entry,
    and return an empty list.&quot;&quot;&quot;

    if filename in cache:
        if len(cache[filename]) != 1:
            cache.pop(filename, None)
    if not filename or (filename.startswith(&#039;&lt;&#039;) and filename.endswith(&#039;&gt;&#039;)):
        return []

    fullname = filename
    try:
        stat = os.stat(fullname)
    except OSError:
        basename = filename

        # Realise a lazy loader based lookup if there is one
        # otherwise try to lookup right now.
        if lazycache(filename, module_globals):
            try:
                data = cache[filename][0]()
            except (ImportError, OSError):
                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 + &#039;\n&#039; 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 (OSError, ValueError):
                pass
        else:
            return []
    except ValueError:  # may be raised by os.stat()
        return []
    try:
        with tokenize.open(fullname) as fp:
            lines = fp.readlines()
    except (OSError, UnicodeDecodeError, SyntaxError):
        return []
    if lines and not lines[-1].endswith(&#039;\n&#039;):
        lines[-1] += &#039;\n&#039;
    size, mtime = stat.st_size, stat.st_mtime
    cache[filename] = size, mtime, lines, fullname
    return lines


def lazycache(filename, module_globals):
    &quot;&quot;&quot;Seed the cache for filename with module_globals.

    The module loader will be asked for the source only when getlines is
    called, not immediately.

    If there is an entry in the cache already, it is not altered.

    :return: True if a lazy load is registered in the cache,
        otherwise False. To register such a load a module loader with a
        get_source method must be found, the filename must be a cacheable
        filename, and the filename must not be already cached.
    &quot;&quot;&quot;
    if filename in cache:
        if len(cache[filename]) == 1:
            return True
        else:
            return False
    if not filename or (filename.startswith(&#039;&lt;&#039;) and filename.endswith(&#039;&gt;&#039;)):
        return False
    # Try for a __loader__, if available
    if module_globals and &#039;__name__&#039; in module_globals:
        spec = module_globals.get(&#039;__spec__&#039;)
        name = getattr(spec, &#039;name&#039;, None) or module_globals[&#039;__name__&#039;]
        loader = getattr(spec, &#039;loader&#039;, None)
        if loader is None:
            loader = module_globals.get(&#039;__loader__&#039;)
        get_source = getattr(loader, &#039;get_source&#039;, None)

        if name and get_source:
            get_lines = functools.partial(get_source, name)
            cache[filename] = (get_lines,)
            return True
    return False
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