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Filename : preprocessors.py

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# ext/preprocessors.py
# Copyright 2006-2019 the Mako authors and contributors <see AUTHORS file>
#
# This module is part of Mako and is released under
# the MIT License: http://www.opensource.org/licenses/mit-license.php

"""preprocessing functions, used with the 'preprocessor'
argument on Template, TemplateLookup"""

import re


def convert_comments(text):
    """preprocess old style comments.

    example:

    from mako.ext.preprocessors import convert_comments
    t = Template(..., preprocessor=convert_comments)"""
    return re.sub(r"(?<=\n)\s*#[^#]", "##", text)