Function back_unicode_name_matches

IPython/core/completer.py:1733–1772

Match Unicode characters back to Unicode name This does ``☃`` -> ``\\snowman`` Note that snowman is not a valid python3 combining character but will be expanded. Though it will not recombine back to the snowman character by the completion machinery. This will not either back-comp

(text: str)

def back_unicode_name_matches(text: str) -> tuple[str, Sequence[str]]:
    """Match Unicode characters back to Unicode name

    This does  ``☃`` -> ``\\snowman``

    Note that snowman is not a valid python3 combining character but will be expanded.
    Though it will not recombine back to the snowman character by the completion machinery.

    This will not either back-complete standard sequences like \\n, \\b ...

    .. deprecated:: 8.6
        You can use :meth:`back_unicode_name_matcher` instead.

    Returns
    =======

    Return a tuple with two elements:

    - The Unicode character that was matched (preceded with a backslash), or
        empty string,
    - a sequence (of 1), name for the match Unicode character, preceded by
        backslash, or empty if no match.
    """
    if len(text)<2:
        return '', ()
    maybe_slash = text[-2]
    if maybe_slash != '\\':
        return '', ()

    char = text[-1]
    # no expand on quote for completion in strings.
    # nor backcomplete standard ascii keys
    if char in string.ascii_letters or char in ('"',"'"):
        return '', ()
    try :
        unic = unicodedata.name(char)
        return '\\'+char,('\\'+unic,)
    except KeyError:
        pass
    return '', ()


@context_matcher()