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from __future__ import annotations
import re
from dataclasses import dataclass
from typing import Literal
AspectWordIndices = tuple[int, ...]
OpinionWordIndices = tuple[int, ...]
Sentiment = Literal["NEG", "NEU", "POS"]
Triplet = tuple[AspectWordIndices, OpinionWordIndices, Sentiment]
word_pattern = re.compile(r"\S+")
@dataclass(frozen=True)
class WordSpan:
start_index: int
end_index: int # this is the letter after the end
@dataclass
class WordSpans:
spans: list[WordSpan]
@staticmethod
def make(text: str) -> WordSpans:
spans = [
WordSpan(start_index=match.start(), end_index=match.end())
for match in word_pattern.finditer(text)
]
return WordSpans(spans)
def to_indices(self, span: tuple[int, ...]) -> tuple[int, int]:
word_start = span[0]
word_start_span = self.spans[word_start]
word_end = span[-1]
word_end_span = self.spans[word_end]
return word_start_span.start_index, word_end_span.end_index - 1
@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
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