# -*- coding: utf-8 -*-

def emojis_to_html_entities(html):
    import re

    def replace_with_html_entity(match):
        # from something like "u'\U0001f60e'" get only "0001f60"
        codepoint = repr(match.group(0))[4:-1]
        return u'&#x{};'.format(codepoint)

    try:
        # UCS-4
        emoji_pattern = re.compile(u'[\U00010000-\U0010ffff]', flags=re.UNICODE | re.MULTILINE)
    except re.error:
        # UCS-2
        emoji_pattern = re.compile(u'[\uD800-\uDBFF][\uDC00-\uDFFF]', flags=re.UNICODE | re.MULTILINE)

    result = re.sub(emoji_pattern, replace_with_html_entity, html)
    return result


if __name__ == "__main__":
    s = u"How 😎 is that, Mr. Müller?"
    r = emojis_to_html_entities(s)
    assert(r == u"How 😎 is that, Mr. Müller?")
    print(r)