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    jinja2.bccache
    ~~~~~~~~~~~~~~

    This module implements the bytecode cache system Jinja is optionally
    using.  This is useful if you have very complex template situations and
    the compiliation of all those templates slow down your application too
    much.

    Situations where this is useful are often forking web applications that
    are initialized on the first request.

    :copyright: (c) 2010 by the Jinja Team.
    :license: BSD.
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itj2tasciiiiitBucketcBsDeZdZd�Zd�Zd�Zd�Zd�Zd�ZRS(suBuckets
are used to store the bytecode for one template.  It's created
    and initialized by the bytecode cache and passed to the loading
functions.

    The buckets get an internal checksum from the cache assigned and use
this
    to automatically reject outdated cache material.  Individual bytecode
    cache subclasses don't have to care about cache invalidation.
   
cCs)||_||_||_|j�dS(N(tenvironmenttkeytchecksumtreset(tselfRRR((s2/usr/lib/python2.7/site-packages/jinja2/bccache.pyt__init__Es			cCs
d|_dS(s)Resets
the bucket (unloads the
bytecode).N(tNoneR(R((s2/usr/lib/python2.7/site-packages/jinja2/bccache.pyRKscCsn|jtt��}|tkr/|j�dStj|�}|j|kr[|j�dSt|�|_dS(s/Loads
bytecode from a file or file like
object.N(	Rtlentbc_magicRRRRRR(RRtmagicR((s2/usr/lib/python2.7/site-packages/jinja2/bccache.pyt
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cCsU|jdkrtd��n|jt�tj|j|d�t|j|�dS(s;Dump
the bytecode into the file or file like object passed.scan't write
empty bucketiN(	RRt	TypeErrorRR
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cCs|jt|��dS(sLoad bytecode from a
string.N(R"R(Rtstring((s2/usr/lib/python2.7/site-packages/jinja2/bccache.pytbytecode_from_stringescCs
t�}|j|�|j�S(sReturn the bytecode as
string.(RR$tgetvalue(Rtout((s2/usr/lib/python2.7/site-packages/jinja2/bccache.pytbytecode_to_stringis	
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__module__t__doc__RRR"R$R&R)(((s2/usr/lib/python2.7/site-packages/jinja2/bccache.pyR<s					t
BytecodeCachecBsPeZdZd�Zd�Zd�Zdd�Zd�Zd�Z	d�Z
RS(	s�To implement your own bytecode cache you have to subclass this
class
    and override :meth:`load_bytecode` and :meth:`dump_bytecode`.  Both of
    these methods are passed a :class:`~jinja2.bccache.Bucket`.

    A very basic bytecode cache that saves the bytecode on the file
system::

        from os import path

        class MyCache(BytecodeCache):

            def __init__(self, directory):
                self.directory = directory

            def load_bytecode(self, bucket):
                filename = path.join(self.directory, bucket.key)
                if path.exists(filename):
                    with open(filename, 'rb') as f:
                        bucket.load_bytecode(f)

            def dump_bytecode(self, bucket):
                filename = path.join(self.directory, bucket.key)
                with open(filename, 'wb') as f:
                    bucket.write_bytecode(f)

    A more advanced version of a filesystem based bytecode cache is part of
    Jinja2.
    cCs
t��dS(s�Subclasses have to override this method to load
bytecode into a
        bucket.  If they are not able to find code in the cache for the
        bucket, it must not do anything.
       
N(tNotImplementedError(Rtbucket((s2/usr/lib/python2.7/site-packages/jinja2/bccache.pyR"�scCs
t��dS(s�Subclasses
have to override this method to write the bytecode
        from a bucket back to the cache.  If it unable to do so it must not
        fail silently but raise an exception.
       
N(R.(RR/((s2/usr/lib/python2.7/site-packages/jinja2/bccache.pyt
dump_bytecode�scCsdS(s�Clears
the cache.  This method is not used by Jinja2 but should be
        implemented to allow applications to clear the bytecode cache used
        by a particular environment.
       
N((R((s2/usr/lib/python2.7/site-packages/jinja2/bccache.pytclear�scCsft|jd��}|dk	r\d|}t|t�rL|jd�}n|j|�n|j�S(s3Returns
the unique hash key for this template
name.sutf-8t|N(RtencodeRRRtupdatet	hexdigest(Rtnametfilenamethash((s2/usr/lib/python2.7/site-packages/jinja2/bccache.pyt
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cCst|jd��j�S(s"Returns a checksum for the
source.sutf-8(RR3R5(Rtsource((s2/usr/lib/python2.7/site-packages/jinja2/bccache.pytget_source_checksum�scCsD|j||�}|j|�}t|||�}|j|�|S(swReturn
a cache bucket for the given template.  All arguments are
        mandatory but filename may be `None`.
       
(R9R;RR"(RRR6R7R:RRR/((s2/usr/lib/python2.7/site-packages/jinja2/bccache.pyt
get_bucket�s

cCs|j|�dS(sPut the bucket into the
cache.N(R0(RR/((s2/usr/lib/python2.7/site-packages/jinja2/bccache.pyt
set_bucket�sN(R*R+R,R"R0R1RR9R;R<R=(((s2/usr/lib/python2.7/site-packages/jinja2/bccache.pyR-ps			
		
tFileSystemBytecodeCachecBsJeZdZddd�Zd�Zd�Zd�Zd�Zd�Z	RS(	s�A
bytecode cache that stores bytecode on the filesystem.  It accepts
    two arguments: The directory where the cache items are stored and a
    pattern string that is used to build the filename.

    If no directory is specified a default cache directory is selected.  On
    Windows the user's temp directory is used, on UNIX systems a
directory
    is created for the user in the system temp directory.

    The pattern can be used to have multiple separate caches operate on the
    same directory.  The default pattern is
``'__jinja2_%s.cache'``.  ``%s``
    is replaced with the cache key.

    >>> bcc =
FileSystemBytecodeCache('/tmp/jinja_cache', '%s.cache')

    This bytecode cache supports clearing of the cache using the clear
method.
   
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uid. You need to explicitly provide another.sLBad permission flags on temp
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!cCstj|j|j|j�S(N(RRIR@RAR(RR/((s2/usr/lib/python2.7/site-packages/jinja2/bccache.pyt_get_cache_filename�scCsJt|j|�d�}|dk	rFz|j|�Wd|j�XndS(Ntrb(RRWRR"tclose(RR/R((s2/usr/lib/python2.7/site-packages/jinja2/bccache.pyR"�s
cCs;t|j|�d�}z|j|�Wd|j�XdS(Ntwb(topenRWR$RY(RR/R((s2/usr/lib/python2.7/site-packages/jinja2/bccache.pyR0�scCsxddlm}tjt|j�|jd�}x?|D]7}y|tj|j|��Wq9t	k
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N(
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class implements a bytecode cache that uses a memcache cache for
    storing the information.  It does not enforce a specific memcache
library
    (tummy's memcache or cmemcache) but will accept any class that
provides
    the minimal interface required.

    Libraries compatible with this class:

    -   `werkzeug <http://werkzeug.pocoo.org/>`_.contrib.cache
    -   `python-memcached
<http://www.tummy.com/Community/software/python-memcached/>`_
    -   `cmemcache <http://gijsbert.org/cmemcache/>`_

    (Unfortunately the django cache interface is not compatible because it
    does not support storing binary data, only unicode.  You can however
pass
    the underlying cache client to the bytecode cache which is available
    as `django.core.cache.cache._client`.)

    The minimal interface for the client passed to the constructor is this:

    .. class:: MinimalClientInterface

        .. method:: set(key, value[, timeout])

            Stores the bytecode in the cache.  `value` is a string and
            `timeout` the timeout of the key.  If timeout is not provided
            a default timeout or no timeout should be assumed, if it's
            provided it's an integer with the number of seconds the
cache
            item should exist.

        .. method:: get(key)

            Returns the value for the cache key.  If the item does not
            exist in the cache the return value must be `None`.

    The other arguments to the constructor are the prefix for all keys that
    is added before the actual cache key and the timeout for the bytecode
in
    the cache system.  We recommend a high (or no) timeout.

    This bytecode cache does not support clearing of used items in the
cache.
    The clear method is a no-operation function.

    .. versionadded:: 2.7
       Added support for ignoring memcache errors through the
       `ignore_memcache_errors` parameter.
   
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