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    jinja2.ext
    ~~~~~~~~~~

    Jinja extensions allow to add custom tags similar to the way django custom
    tags work.  By default two example extensions exist: an i18n and a cache
    extension.

    :copyright: (c) 2010 by the Jinja Team.
    :license: BSD.
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    environment ends up acting as central configuration storage the
    attributes may clash which is why extensions have to ensure that the names
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    This example explains the behavior:

    >>> from jinja2 import Environment
    >>> env = Environment()
    >>> node = env.parse('{{ (_("foo"), _(), ngettext("foo", "bar", 42)) }}')
    >>> list(extract_from_ast(node))
    [(1, '_', 'foo'), (1, '_', ()), (1, 'ngettext', ('foo', 'bar', None))]
    >>> list(extract_from_ast(node, babel_style=False))
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    For every string found this function yields a ``(lineno, function,
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       try to find the best preceeding comment that begins with one of the
       keywords.  For best results, make sure to not have more than one
       gettext call in one line of code and the matching comment in the
       same line or the line before.

    .. versionchanged:: 2.5.1
       The `newstyle_gettext` flag can be set to `True` to enable newstyle
       gettext calls.

    .. versionchanged:: 2.7
       A `silent` option can now be provided.  If set to `False` template
       syntax errors are propagated instead of being ignored.

    :param fileobj: the file-like object the messages should be extracted from
    :param keywords: a list of keywords (i.e. function names) that should be
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    :param comment_tags: a list of translator tags to search for and include
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    :param options: a dictionary of additional options (optional)
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