Source code for cltk.stem.akk

"""Stemmer for Akkadian."""

__author__ = ["M. Willis Monroe <willismonroe@gmail.com>"]
__license__ = "MIT License. See LICENSE."

from typing import Union

AKK_END_TYPES = dict[str, dict[str, Union[str, list[str], dict[str, str]]]]
AKKADIAN_ENDINGS: AKK_END_TYPES = {
    "m": {
        "singular": {"nominative": "um", "accusative": "am", "genitive": "im"},
        "dual": {"nominative": "ān", "oblique": "īn"},
        "plural": {"nominative": "ū", "oblique": "ī"},
    },
    "f": {
        "singular": {"nominative": "tum", "accusative": "tam", "genitive": "tim"},
        "dual": {"nominative": "tān", "oblique": "tīn"},
        "plural": {
            "nominative": ["ātum", "ētum", "ītum"],
            "oblique": ["ātim", "ētim", "ītum"],
        },
    },
}


def stem(noun: str, gender: str, mimation: bool = True) -> str:
    """
    Return the stem of a noun, given a declined form and its gender

    >>> stem("šarrū", 'm')
    'šarr'
    """

    stem = ""

    if mimation and noun[-1:] == "m":
        # noun = noun[:-1]
        # TODO what should we do here?
        pass

    # Take off ending
    if gender == "m":
        if noun[-2:] in list(AKKADIAN_ENDINGS["m"]["singular"].values()) + list(
            AKKADIAN_ENDINGS["m"]["dual"].values()
        ):
            stem = noun[:-2]
        elif noun[-1] in list(AKKADIAN_ENDINGS["m"]["plural"].values()):
            stem = noun[:-1]
        else:
            # we don't recognize the ending, so return the noun.
            stem = noun
    elif gender == "f":
        if (
            noun[-4:]
            in AKKADIAN_ENDINGS["f"]["plural"]["nominative"]
            + AKKADIAN_ENDINGS["f"]["plural"]["oblique"]
        ):
            stem = noun[:-4] + "t"
        elif noun[-3:] in list(AKKADIAN_ENDINGS["f"]["singular"].values()) + list(
            AKKADIAN_ENDINGS["f"]["dual"].values()
        ):
            stem = noun[:-3] + "t"
        elif noun[-2:] in list(AKKADIAN_ENDINGS["m"]["singular"].values()) + list(
            AKKADIAN_ENDINGS["m"]["dual"].values()
        ):
            stem = noun[:-2]
        else:
            # we don't recognize the ending, so return the noun.
            stem = noun
    else:
        stem = noun
    return stem