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j� e� � e( d� � Z� e� e= e� � d� � Z� e( d� � Z� e� e j� e� � e� e0 d� � r(e� e0 j� e� � n eF d� d� i �eF d� d� i �d� � Z� d� � Z� d� � Z� d� � Z� e2 d� � Z� d� � Z� e� e j� e� � e� e
j� e� � e� e0 d� � r�e� e0 j� e� � n d� � Z� e� e= e� � d� � Z� i d� � Z� d� � Z� d� � Z� d� � Z� e jc d� � j� Z� e jc d� e j� e j� B� j� Z� d? e= f d� � � YZ� d� � Z� d� � Z� d= e= f d� � � YZ� d� e� f d� � � YZ� d� e� f d� � � YZ� i e� d� 6e� d� 6e� d� 6Z� d� � Z� d� e� f d� � � YZ� d� � Z� d> e4 j� j� f d� � � YZ� d� � Z� d� � Z� d� � Z� d� � Z� d� � Z� d� � Z� e j� d� d� e< d� e& �d� � Z� e� e� � d� � � Z� e� d� � � Z� d S(� sZ
Package resource API
--------------------
A resource is a logical file contained within a package, or a logical
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path separator is. Do not use os.path operations to manipulate resource
names being passed into the API.
The package resource API is designed to work with normal filesystem packages,
.egg files, and unpacked .egg files. It can also work in a limited way with
.zip files and with custom PEP 302 loaders that support the ``get_data()``
method.
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rs qw Xn | S( sZ Return this platform's maximum compatible version.
distutils.util.get_platform() normally reports the minimum version
of Mac OS X that would be required to *use* extensions produced by
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A VersionConflict that accepts a third parameter, the set of the
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j � d d d � } | j | � x/ | D]' } | | j |
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Map each requirement to the extras that demanded it.
c @ s: � f d � | j � d � d D� } � j p9 t | � S( s�
Evaluate markers for req against each extra that
demanded it.
Return False if the req has a marker and fails
evaluation. Otherwise, return True.
c 3@ s( | ] } � j j i | d 6� Vq d S( t extraN( t markert evaluate( t .0RM ( R� ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pys � s ( N( N( R= Ra RN t any( R R� t extra_evals( ( R� sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyR, � s ( R R R R, ( ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyR( � s c B@ s� e Z d Z d e � e d � Z d � Z d � Z d d � Z d � Z
d � Z d d � Z d d � Z
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s5 Searchable snapshot of distributions on a search pathc C@ s, i | _ | | _ | | _ | j | � d S( s! Snapshot distributions available on a search path
Any distributions found on `search_path` are added to the environment.
`search_path` should be a sequence of ``sys.path`` items. If not
supplied, ``sys.path`` is used.
`platform` is an optional string specifying the name of the platform
that platform-specific distributions must be compatible with. If
unspecified, it defaults to the current platform. `python` is an
optional string naming the desired version of Python (e.g. ``'3.3'``);
it defaults to the current version.
You may explicitly set `platform` (and/or `python`) to ``None`` if you
wish to map *all* distributions, not just those compatible with the
running platform or Python version.
N( t _distmapRj t pythont scan( R t search_pathRj RT ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyR s c C@ sC | j d k s0 | j d k s0 | j | j k oB t | j | j � S( s� Is distribution `dist` acceptable for this environment?
The distribution must match the platform and python version
requirements specified when this environment was created, or False
is returned.
N( RT Ra t
py_versionR� Rj ( R R� ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyt can_add s c C@ s | j | j j | � d S( s" Remove `dist` from the environmentN( RS R t remove( R R� ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyRY ( s c C@ sQ | d k r t j } n x2 | D]* } x! t | � D] } | j | � q2 Wq Wd S( sd Scan `search_path` for distributions usable in this environment
Any distributions found are added to the environment.
`search_path` should be a sequence of ``sys.path`` items. If not
supplied, ``sys.path`` is used. Only distributions conforming to
the platform/python version defined at initialization are added.
N( Ra Ri R� R� R ( R RV R R� ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyRU , s
c C@ s | j � } | j j | g � S( s Return a newest-to-oldest list of distributions for `project_name`
Uses case-insensitive `project_name` comparison, assuming all the
project's distributions use their project's name converted to all
lowercase as their key.
( R3 RS R= ( R R0 t distribution_key( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyR! ; s c C@ su | j | � rq | j � rq | j j | j g � } | | k rq | j | � | j d t j d � d t � qq n d S( sL Add `dist` if we ``can_add()`` it and it has not already been added
R t hashcmpt reverseN(
RX t has_versionRS R R R6 R< t operatort
attrgetterR� ( R R� R ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyR F s
c C@ sW | j | � } | d k r | Sx% | | j D] } | | k r- | Sq- W| j | | � S( s� Find distribution best matching `req` and usable on `working_set`
This calls the ``find(req)`` method of the `working_set` to see if a
suitable distribution is already active. (This may raise
``VersionConflict`` if an unsuitable version of the project is already
active in the specified `working_set`.) If a suitable distribution
isn't active, this method returns the newest distribution in the
environment that meets the ``Requirement`` in `req`. If no suitable
distribution is found, and `installer` is supplied, then the result of
calling the environment's ``obtain(req, installer)`` method will be
returned.
N( R� Ra R t obtain( R R� R� R3 R� ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyR- O s
c C@ s | d k r | | � Sd S( s� Obtain a distribution matching `requirement` (e.g. via download)
Obtain a distro that matches requirement (e.g. via download). In the
base ``Environment`` class, this routine just returns
``installer(requirement)``, unless `installer` is None, in which case
None is returned instead. This method is a hook that allows subclasses
to attempt other ways of obtaining a distribution before falling back
to the `installer` argument.N( Ra ( R t requirementR3 ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyR` e s c c@ s0 x) | j j � D] } | | r | Vq q Wd S( s= Yield the unique project names of the available distributionsN( RS R% ( R R ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyRB q s
c C@ s{ t | t � r | j | � nX t | t � rd xF | D]( } x | | D] } | j | � qF Wq5 Wn t d | f � � | S( s2 In-place addition of a distribution or environments Can't add %r to environment( R R� R R� R� ( R R t projectR� ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyt __iadd__w s
c C@ s@ | j g d d d d �} x | | f D] } | | 7} q( W| S( s4 Add an environment or distribution to an environmentRj RT N( R� Ra ( R R t newR2 ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyt __add__� s N( R R R Ra Rq t PY_MAJORR RX RY RU R! R R- R` RB Rc Re ( ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyR� s c B@ s e Z d Z RS( sT An error occurred extracting a resource
The following attributes are available from instances of this exception:
manager
The resource manager that raised this exception
cache_path
The base directory for resource extraction
original_error
The exception instance that caused extraction to fail
( R R R ( ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyR� � s
c B@ s� e Z d Z d Z d � Z d � Z d � Z d � Z d � Z d � Z
d � Z d � Z d d � Z
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� Z RS( s' Manage resource extraction and packagesc C@ s
i | _ d S( N( t cached_files( R ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyR � s c C@ s t | � j | � S( s Does the named resource exist?( Rt R ( R t package_or_requirementR ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyR~ � s c C@ s t | � j | � S( s, Is the named resource an existing directory?( Rt R ( R Rh R ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyR � s c C@ s t | � j | | � S( s4 Return a true filesystem path for specified resource( Rt R ( R Rh R ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyR| � s c C@ s t | � j | | � S( s9 Return a readable file-like object for specified resource( Rt R ( R Rh R ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyR{ � s c C@ s t | � j | | � S( s% Return specified resource as a string( Rt R ( R Rh R ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyRz � s c C@ s t | � j | � S( s1 List the contents of the named resource directory( Rt R} ( R Rh R ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyR} � s c C@ st t j � d } | j p t � } t j d � j � } t | j t � � � } | | _
| | _ | | _ | � d S( s5 Give an error message for problems extracting file(s)i s
Can't extract file(s) to egg cache
The following error occurred while trying to extract file(s) to the Python egg
cache:
{old_exc}
The Python egg cache directory is currently set to:
{cache_path}
Perhaps your account does not have write access to this directory? You can
change the cache directory by setting the PYTHON_EGG_CACHE environment
variable to point to an accessible directory.
N(
Ri t exc_infot extraction_pathR� t textwrapt dedentt lstripR� R� R� R t
cache_patht original_error( R t old_excRn t tmplt err( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyt extraction_error� s c C@ sn | j p t � } t j j | | d | � } y t | � Wn | j � n X| j | � d | j | <| S( s� Return absolute location in cache for `archive_name` and `names`
The parent directory of the resulting path will be created if it does
not already exist. `archive_name` should be the base filename of the
enclosing egg (which may not be the name of the enclosing zipfile!),
including its ".egg" extension. `names`, if provided, should be a
sequence of path name parts "under" the egg's extraction location.
This method should only be called by resource providers that need to
obtain an extraction location, and only for names they intend to
extract, as it tracks the generated names for possible cleanup later.
s -tmpi ( Rj R� R� R� Rk t _bypass_ensure_directoryRs t _warn_unsafe_extraction_pathRg ( R t archive_namet namest extract_patht target_path( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyt get_cache_path� s
c C@ sw t j d k r* | j t j d � r* d St j | � j } | t j @sV | t j @rs d | } t j | t
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If the default extraction path is overridden and set to an insecure
location, such as /tmp, it opens up an opportunity for an attacker to
replace an extracted file with an unauthorized payload. Warn the user
if a known insecure location is used.
See Distribute #375 for more details.
t ntt windirNs� %s is writable by group/others and vulnerable to attack when used with get_resource_filename. Consider a more secure location (set with .set_extraction_path or the PYTHON_EGG_CACHE environment variable).( R� R� R4 t environt statt st_modet S_IWOTHt S_IWGRPR> R? t UserWarning( R� t modet msg( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyRu � s
&c C@ s@ t j d k r< t j | � j d Bd @} t j | | � n d S( s4 Perform any platform-specific postprocessing of `tempname`
This is where Mac header rewrites should be done; other platforms don't
have anything special they should do.
Resource providers should call this method ONLY after successfully
extracting a compressed resource. They must NOT call it on resources
that are already in the filesystem.
`tempname` is the current (temporary) name of the file, and `filename`
is the name it will be renamed to by the caller after this routine
returns.
t posixim i� N( R� R� R~ R t chmod( R t tempnamet filenameR� ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyt postprocess s c C@ s% | j r t d � � n | | _ d S( s� Set the base path where resources will be extracted to, if needed.
If you do not call this routine before any extractions take place, the
path defaults to the return value of ``get_default_cache()``. (Which
is based on the ``PYTHON_EGG_CACHE`` environment variable, with various
platform-specific fallbacks. See that routine's documentation for more
details.)
Resources are extracted to subdirectories of this path based upon
information given by the ``IResourceProvider``. You may set this to a
temporary directory, but then you must call ``cleanup_resources()`` to
delete the extracted files when done. There is no guarantee that
``cleanup_resources()`` will be able to remove all extracted files.
(Note: you may not change the extraction path for a given resource
manager once resources have been extracted, unless you first call
``cleanup_resources()``.)
s5 Can't change extraction path, files already extractedN( Rg Rn Rj ( R R� ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyR� ) s c C@ s d S( sB
Delete all extracted resource files and directories, returning a list
of the file and directory names that could not be successfully removed.
This function does not have any concurrency protection, so it should
generally only be called when the extraction path is a temporary
directory exclusive to a single process. This method is not
automatically called; you must call it explicitly or register it as an
``atexit`` function if you wish to ensure cleanup of a temporary
directory used for extractions.
N( ( R t force( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyR� C Rd N( ( R R R Ra Rj R R~ R R| R{ Rz R} Rs Rz t staticmethodRu R� R� R� R� ( ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyR� � s c C@ s" t j j d � p! t j d d � S( s�
Return the ``PYTHON_EGG_CACHE`` environment variable
or a platform-relevant user cache dir for an app
named "Python-Eggs".
t PYTHON_EGG_CACHEt appnames Python-Eggs( R� R} R= R
t user_cache_dir( ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyR� Q s c C@ s t j d d | � S( s� Convert an arbitrary string to a standard distribution name
Any runs of non-alphanumeric/. characters are replaced with a single '-'.
s [^A-Za-z0-9.]+R% ( R: t sub( R� ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyR� ] s c C@ sZ y t t j j | � � SWn9 t j j k
rU | j d d � } t j d d | � SXd S( sB
Convert an arbitrary string to a standard version string
R� R) s [^A-Za-z0-9.]+R% N( RA R RE t VersionRF R0 R: R� ( RE ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyR� e s
c C@ s t j d d | � j � S( s� Convert an arbitrary string to a standard 'extra' name
Any runs of non-alphanumeric characters are replaced with a single '_',
and the result is always lowercased.
s [^A-Za-z0-9.-]+R� ( R: R� R3 ( RM ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyR� q s c C@ s | j d d � S( s| Convert a project or version name to its filename-escaped form
Any '-' characters are currently replaced with '_'.
R% R� ( R0 ( R� ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyR� z s c C@ s; y t | � Wn& t k
r6 } d | _ d | _ | SXt S( so
Validate text as a PEP 508 environment marker; return an exception
if invalid or False otherwise.
N( R� t SyntaxErrorRa R� t linenoR� ( t textt e( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyR� � s c C@ sL y t j j | � } | j � SWn% t j j k
rG } t | � � n Xd S( s�
Evaluate a PEP 508 environment marker.
Return a boolean indicating the marker result in this environment.
Raise SyntaxError if marker is invalid.
This implementation uses the 'pyparsing' module.
N( R t markerst MarkerRO t
InvalidMarkerR� ( R� RM RN R� ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyR� � s
c B@ s� e Z d Z d Z d Z d Z d � Z d � Z d � Z d � Z
d � Z d � Z d � Z
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� Z d � Z d � Z d � Z d � Z d � Z RS( sE Try to implement resources and metadata for arbitrary PEP 302 loadersc C@ s: t | d d � | _ t j j t | d d � � | _ d S( NR� t __file__Rd ( R� Ra R� R� R� t dirnamet module_path( R R� ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyR � s c C@ s | j | j | � S( N( t _fnR� ( R R R ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyR � s c C@ s t j | j | | � � S( N( t iot BytesIOR ( R R R ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyR � s c C@ s | j | j | j | � � S( N( t _getR� R� ( R R R ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyR � s c C@ s | j | j | j | � � S( N( t _hasR� R� ( R R ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyR � s c C@ s% | j o$ | j | j | j | � � S( N( t egg_infoR� R� ( R R� ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyR� � s c C@ sE | j s
d S| j | j | j | � � } t j rA | j d � S| S( NRd s utf-8( R� R� R� R t PY3t decode( R R� t value( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyR� � s c C@ s t | j | � � S( N( R� R� ( R R� ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyR� � s c C@ s | j | j | j | � � S( N( t _isdirR� R� ( R R ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyR � s c C@ s% | j o$ | j | j | j | � � S( N( R� R� R� ( R R� ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyR� � s c C@ s | j | j | j | � � S( N( t _listdirR� R� ( R R ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyR} � s c C@ s) | j r% | j | j | j | � � Sg S( N( R� R� R� ( R R� ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyR � s c
B@ s d | } | j | � s, e d | � � n | j | � j d d � } | j d d � } | j | j | � } | | d s N(
R R R R� R� R� R� Ra R� R ( ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyR� 6 s
t ZipManifestsc B@ s# e Z d Z e d � � Z e Z RS( s
zip manifest builder
c @ s? t | � �- � � f d � � j � D� } t | � SWd QXd S( s
Build a dictionary similar to the zipimport directory
caches, except instead of tuples, store ZipInfo objects.
Use a platform-specific path separator (os.sep) for the path keys
for compatibility with pypy on Windows.
c 3@ s3 | ]) } | j d t j � � j | � f Vq d S( R� N( R0 R� t sept getinfo( RP R� ( t zfile( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pys U s N( t ContextualZipFilet namelistRL ( R R� RR ( ( R� sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyt buildJ s ( R R R RL R� t load( ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyR� E s t MemoizedZipManifestsc B@ s) e Z d Z e j d d � Z d � Z RS( s%
Memoized zipfile manifests.
t manifest_mods manifest mtimec C@ sv t j j | � } t j | � j } | | k sC | | j | k rk | j | � } | j | | � | | "os.rename" and "os.unlink" are not supported on this platforms .$extractt dirR{ ( t _indexR� R� R� Rk R� R� R� t
WRITE_SUPPORTt IOErrorRz R� R� t _is_currentt _mkstempt writeR� R� R� R R� R t errort isfileR� R Rs (
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c C@ s� | j | j | � \ } } t j j | � s2 t St j | � } | j | k s_ | j | k rc t S| j j
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Return True if the file_path is current for this zip_path
R� N(
R� R� R� R� R� R� R~ t st_sizeR� R� R� R
R� ( R t file_pathR� R� R� R~ t zip_contentst ft
file_contents( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyR� � s c C@ sa | j d k rZ g } x6 d D]. } | j | � r | j | j | � � q q W| | _ n | j S( Ns native_libs.txts eager_resources.txt( s native_libs.txts eager_resources.txt( R� Ra R� R/ R� ( R R� R� ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyR� s
c C@ s� y | j SWn� t k
r� i } x~ | j D]s } | j t j � } xX | r� t j j | d � } | | k r� | | j | d � PqF | j � g | | R? ( R R t replacement_charRq R� ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyR L s
c C@ s t | j | � � S( N( R� R� ( R R� ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyR� T s ( R R R R R� R� R R� ( ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyR� 1 s
c B@ s e Z d Z d � Z RS( ss Metadata provider for egg directories
Usage::
# Development eggs:
egg_info = "/path/to/PackageName.egg-info"
base_dir = os.path.dirname(egg_info)
metadata = PathMetadata(base_dir, egg_info)
dist_name = os.path.splitext(os.path.basename(egg_info))[0]
dist = Distribution(basedir, project_name=dist_name, metadata=metadata)
# Unpacked egg directories:
egg_path = "/path/to/PackageName-ver-pyver-etc.egg"
metadata = PathMetadata(egg_path, os.path.join(egg_path,'EGG-INFO'))
dist = Distribution.from_filename(egg_path, metadata=metadata)
c C@ s | | _ | | _ d S( N( R� R� ( R R� R� ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyR l s ( R R R R ( ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyR� X s c B@ s e Z d Z d � Z RS( s Metadata provider for .egg filesc C@ s` | j t j | _ | | _ | j rF t j j | j | j � | _ n | j | _ | j � d S( s- Create a metadata provider from a zipimporterN(
R� R� R� R� R� t prefixR� Rk R� R� ( R t importer( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyR t s ! ( R R R R ( ( ( sF /usr/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.pyR� q s RL t _distribution_findersc C@ s | t | >> names = 'bar', 'foo', 'Python-2.7.10.egg', 'Python-2.7.2.egg'
>>> _by_version_descending(names)
['Python-2.7.10.egg', 'Python-2.7.2.egg', 'foo', 'bar']
>>> names = 'Setuptools-1.2.3b1.egg', 'Setuptools-1.2.3.egg'
>>> _by_version_descending(names)
['Setuptools-1.2.3.egg', 'Setuptools-1.2.3b1.egg']
>>> names = 'Setuptools-1.2.3b1.egg', 'Setuptools-1.2.3.post1.egg'
>>> _by_version_descending(names)
['Setuptools-1.2.3.post1.egg', 'Setuptools-1.2.3b1.egg']
c S@ sY t j j | � \ } } t j | j d � | g � } g | D] } t j j | � ^ q= S( s6
Parse each component of the filename
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