mirror of
https://github.com/hwchase17/langchain
synced 2024-11-02 09:40:22 +00:00
25fbe356b4
This PR upgrades community to a recent version of mypy. It inserts type: ignore on all existing failures.
119 lines
4.2 KiB
Python
119 lines
4.2 KiB
Python
import logging
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import os
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import re
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import zipfile
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from typing import Iterator, List, Union
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from langchain_core.chat_loaders import BaseChatLoader
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from langchain_core.chat_sessions import ChatSession
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from langchain_core.messages import AIMessage, HumanMessage
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logger = logging.getLogger(__name__)
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class WhatsAppChatLoader(BaseChatLoader):
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"""Load `WhatsApp` conversations from a dump zip file or directory."""
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def __init__(self, path: str):
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"""Initialize the WhatsAppChatLoader.
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Args:
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path (str): Path to the exported WhatsApp chat
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zip directory, folder, or file.
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To generate the dump, open the chat, click the three dots in the top
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right corner, and select "More". Then select "Export chat" and
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choose "Without media".
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"""
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self.path = path
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ignore_lines = [
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"This message was deleted",
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"<Media omitted>",
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"image omitted",
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"Messages and calls are end-to-end encrypted. No one outside of this chat,"
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" not even WhatsApp, can read or listen to them.",
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]
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self._ignore_lines = re.compile(
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r"(" + "|".join([r"\u200E*" + line for line in ignore_lines]) + r")",
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flags=re.IGNORECASE,
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)
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self._message_line_regex = re.compile(
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r"\u200E*\[?(\d{1,2}/\d{1,2}/\d{2,4}, \d{1,2}:\d{2}:\d{2} (?:AM|PM))\]?[ \u200E]*([^:]+): (.+)", # noqa
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flags=re.IGNORECASE,
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)
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def _load_single_chat_session(self, file_path: str) -> ChatSession:
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"""Load a single chat session from a file.
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Args:
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file_path (str): Path to the chat file.
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Returns:
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ChatSession: The loaded chat session.
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"""
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with open(file_path, "r", encoding="utf-8") as file:
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txt = file.read()
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# Split messages by newlines, but keep multi-line messages grouped
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chat_lines: List[str] = []
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current_message = ""
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for line in txt.split("\n"):
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if self._message_line_regex.match(line):
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if current_message:
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chat_lines.append(current_message)
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current_message = line
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else:
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current_message += " " + line.strip()
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if current_message:
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chat_lines.append(current_message)
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results: List[Union[HumanMessage, AIMessage]] = []
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for line in chat_lines:
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result = self._message_line_regex.match(line.strip())
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if result:
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timestamp, sender, text = result.groups()
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if not self._ignore_lines.match(text.strip()):
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results.append(
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HumanMessage( # type: ignore[call-arg]
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role=sender,
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content=text,
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additional_kwargs={
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"sender": sender,
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"events": [{"message_time": timestamp}],
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},
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)
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)
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else:
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logger.debug(f"Could not parse line: {line}")
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return ChatSession(messages=results)
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def _iterate_files(self, path: str) -> Iterator[str]:
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"""Iterate over the files in a directory or zip file.
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Args:
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path (str): Path to the directory or zip file.
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Yields:
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str: The path to each file.
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"""
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if os.path.isfile(path):
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yield path
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elif os.path.isdir(path):
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for root, _, files in os.walk(path):
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for file in files:
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if file.endswith(".txt"):
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yield os.path.join(root, file)
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elif zipfile.is_zipfile(path):
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with zipfile.ZipFile(path) as zip_file:
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for file in zip_file.namelist():
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if file.endswith(".txt"):
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yield zip_file.extract(file)
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def lazy_load(self) -> Iterator[ChatSession]:
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"""Lazy load the messages from the chat file and yield
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them as chat sessions.
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Yields:
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Iterator[ChatSession]: The loaded chat sessions.
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"""
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yield self._load_single_chat_session(self.path)
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