mirror of
https://github.com/hwchase17/langchain
synced 2024-11-10 01:10:59 +00:00
77 lines
2.5 KiB
Python
77 lines
2.5 KiB
Python
import email
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import logging
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from typing import Dict, Iterator, Union
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from langchain_core.documents import Document
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from langchain_community.document_loaders.base import BaseLoader
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logger = logging.getLogger(__name__)
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class MHTMLLoader(BaseLoader):
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"""Parse `MHTML` files with `BeautifulSoup`."""
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def __init__(
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self,
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file_path: str,
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open_encoding: Union[str, None] = None,
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bs_kwargs: Union[dict, None] = None,
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get_text_separator: str = "",
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) -> None:
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"""initialize with path, and optionally, file encoding to use, and any kwargs
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to pass to the BeautifulSoup object.
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Args:
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file_path: Path to file to load.
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open_encoding: The encoding to use when opening the file.
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bs_kwargs: Any kwargs to pass to the BeautifulSoup object.
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get_text_separator: The separator to use when getting the text
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from the soup.
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"""
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try:
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import bs4 # noqa:F401
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except ImportError:
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raise ImportError(
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"beautifulsoup4 package not found, please install it with "
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"`pip install beautifulsoup4`"
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)
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self.file_path = file_path
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self.open_encoding = open_encoding
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if bs_kwargs is None:
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bs_kwargs = {"features": "lxml"}
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self.bs_kwargs = bs_kwargs
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self.get_text_separator = get_text_separator
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def lazy_load(self) -> Iterator[Document]:
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"""Load MHTML document into document objects."""
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from bs4 import BeautifulSoup
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with open(self.file_path, "r", encoding=self.open_encoding) as f:
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message = email.message_from_string(f.read())
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parts = message.get_payload()
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if not isinstance(parts, list):
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parts = [message]
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for part in parts:
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if part.get_content_type() == "text/html":
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html = part.get_payload(decode=True).decode()
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soup = BeautifulSoup(html, **self.bs_kwargs)
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text = soup.get_text(self.get_text_separator)
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if soup.title:
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title = str(soup.title.string)
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else:
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title = ""
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metadata: Dict[str, Union[str, None]] = {
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"source": self.file_path,
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"title": title,
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}
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yield Document(page_content=text, metadata=metadata)
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return
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