mirror of
https://github.com/hwchase17/langchain
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f7a1fd91b8
So this arose from the https://github.com/langchain-ai/langchain/pull/18397 problem of document loaders not supporting `pathlib.Path`. This pull request provides more uniform support for Path as an argument. The core ideas for this upgrade: - if there is a local file path used as an argument, it should be supported as `pathlib.Path` - if there are some external calls that may or may not support Pathlib, the argument is immidiately converted to `str` - if there `self.file_path` is used in a way that it allows for it to stay pathlib without conversion, is is only converted for the metadata. Twitter handle: https://twitter.com/mwmajewsk
80 lines
2.7 KiB
Python
80 lines
2.7 KiB
Python
import re
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from pathlib import Path
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from typing import 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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class AcreomLoader(BaseLoader):
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"""Load `acreom` vault from a directory."""
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FRONT_MATTER_REGEX = re.compile(r"^---\n(.*?)\n---\n", re.MULTILINE | re.DOTALL)
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"""Regex to match front matter metadata in markdown files."""
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def __init__(
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self,
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path: Union[str, Path],
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encoding: str = "UTF-8",
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collect_metadata: bool = True,
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):
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"""Initialize the loader."""
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self.file_path = path
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"""Path to the directory containing the markdown files."""
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self.encoding = encoding
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"""Encoding to use when reading the files."""
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self.collect_metadata = collect_metadata
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"""Whether to collect metadata from the front matter."""
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def _parse_front_matter(self, content: str) -> dict:
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"""Parse front matter metadata from the content and return it as a dict."""
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if not self.collect_metadata:
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return {}
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match = self.FRONT_MATTER_REGEX.search(content)
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front_matter = {}
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if match:
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lines = match.group(1).split("\n")
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for line in lines:
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if ":" in line:
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key, value = line.split(":", 1)
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front_matter[key.strip()] = value.strip()
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else:
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# Skip lines without a colon
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continue
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return front_matter
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def _remove_front_matter(self, content: str) -> str:
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"""Remove front matter metadata from the given content."""
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if not self.collect_metadata:
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return content
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return self.FRONT_MATTER_REGEX.sub("", content)
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def _process_acreom_content(self, content: str) -> str:
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# remove acreom specific elements from content that
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# do not contribute to the context of current document
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content = re.sub(r"\s*-\s\[\s\]\s.*|\s*\[\s\]\s.*", "", content) # rm tasks
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content = re.sub(r"#", "", content) # rm hashtags
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content = re.sub(r"\[\[.*?\]\]", "", content) # rm doclinks
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return content
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def lazy_load(self) -> Iterator[Document]:
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ps = list(Path(self.file_path).glob("**/*.md"))
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for p in ps:
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with open(p, encoding=self.encoding) as f:
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text = f.read()
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front_matter = self._parse_front_matter(text)
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text = self._remove_front_matter(text)
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text = self._process_acreom_content(text)
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metadata = {
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"source": str(p.name),
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"path": str(p),
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**front_matter,
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}
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yield Document(page_content=text, metadata=metadata)
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