src/types.py

from __future__ import annotations

import re
from dataclasses import dataclass

word_pattern = re.compile(r"\S+")


@dataclass(frozen=True)
class WordSpan:
    start_index: int
    end_index: int  # this is the letter after the end

    @staticmethod
    def to_spans(text: str) -> list[WordSpan]:
        return [
            WordSpan(start_index=match.start(), end_index=match.end())
            for match in word_pattern.finditer(text)
        ]


@dataclass(frozen=True)
class CharacterIndices:
    aspect_start_index: int
    aspect_end_index: int
    aspect_term: str
    opinion_start_index: int
    opinion_end_index: int
    opinion_term: str
    sentiment: str