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    jinja2.lexer
    ~~~~~~~~~~~~

    This module implements a Jinja / Python combination lexer. The
    `Lexer` class provided by this module is used to do some preprocessing
    for Jinja.

    On the one hand it filters out invalid operators like the bitshift
    operators we don't allow in templates. On the other hand it separates
    template code and python code in expressions.

    :copyright: (c) 2010 by the Jinja Team.
    :license: BSD, see LICENSE for more details.
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