Function back_latex_name_matcher

IPython/core/completer.py:1776–1810

Match latex characters back to unicode name This does ``\\ℵ`` -> ``\\aleph``

(context: CompletionContext)

@context_matcher()
def back_latex_name_matcher(context: CompletionContext) -> SimpleMatcherResult:
    """Match latex characters back to unicode name

    This does ``\\ℵ`` -> ``\\aleph``
    """

    text = context.text_until_cursor
    no_match = {
        "completions": [],
        "suppress": False,
    }

    if len(text)<2:
        return no_match
    maybe_slash = text[-2]
    if maybe_slash != '\\':
        return no_match

    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 no_match
    try :
        latex = reverse_latex_symbol[char]
        # '\\' replace the \ as well
        return {
            "completions": [SimpleCompletion(text=latex, type="latex")],
            "suppress": True,
            "matched_fragment": "\\" + char,
        }
    except KeyError:
        pass

    return no_match

def _formatparamchildren(parameter) -> str:
    """