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

# MIT License
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# Copyright 2018-2022 New York University Abu Dhabi
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"""This sub-module contains common functions and classes used for tagging.
"""


from abc import ABC, abstractmethod


class Tagger(ABC):
    """Base class for taggers. A tagger maps each item in a list of tokens
    (i.e. a sentence) to some other value. Examples of taggers include POS
    taggers, diacritizers, etc.
    """

    @abstractmethod
    def tag(self, sentence):
        """Generate a tag for each token in a given sentence.

        Args:
            sentence (:obj:`list` of :obj:`str`): The sentence to be tagged.

        Returns:
            :obj:`list`: The list of tags corresponding to each token in
            `sentence`.
        """

        raise NotImplementedError
