translator.py

from deep_translator import GoogleTranslator
from transformers import pipeline
import translators as ts


class MangaTranslator:
    def __init__(self):
        self.target = "es"
        self.source = "ja"
        self.translators = {
            "google": self._translate_with_google,
            "hf": self._translate_with_hf,
            "baidu": self._translate_with_baidu,
            "bing": self._translate_with_bing
        }

    def translate(self, text, method="google"):
        """
        Translates the given text to the target language using the specified method.

        Args:
            text (str): The text to be translated.
            method (str):"google" for Google Translator, 
                         "hf" for Helsinki-NLP's opus-mt-ja-es model (HF pipeline)
                         "baidu" for Baidu Translate
                         "bing" for Microsoft Bing Translator

        Returns:
            str: The translated text.
        """
        translator_func = self.translators.get(method)
        
        if translator_func:
            return translator_func(self._preprocess_text(text))
        else:
            raise ValueError("Invalid translation method.")
            
    def _translate_with_google(self, text):
        translator = GoogleTranslator(source=self.source, target=self.target)
        translated_text = translator.translate(text)
        return translated_text if translated_text is not None else text

    def _translate_with_hf(self, text):
        pipe = pipeline("translation", model=f"Helsinki-NLP/opus-mt-ja-es")
        translated_text = pipe(text)[0]["translation_text"]
        return translated_text if translated_text is not None else text

    def _translate_with_baidu(self, text):
        translated_text = ts.translate_text(text, translator="baidu",
                                            from_language="jp", 
                                            to_language=self.target)
        return translated_text if translated_text is not None else text

    def _translate_with_bing(self, text):
        translated_text = ts.translate_text(text, translator="bing",
                                            from_language=self.source, 
                                            to_language=self.target)
        return translated_text if translated_text is not None else text

    def _preprocess_text(self, text):
        preprocessed_text = text.replace("．", ".")
        return preprocessed_text