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91 lines
3.0 KiB
Python
91 lines
3.0 KiB
Python
"""Loader that uses unstructured to load files."""
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from abc import ABC, abstractmethod
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from typing import IO, List
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from langchain.docstore.document import Document
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from langchain.document_loaders.base import BaseLoader
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class UnstructuredBaseLoader(BaseLoader, ABC):
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"""Loader that uses unstructured to load files."""
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def __init__(self, mode: str = "single"):
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"""Initialize with file path."""
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try:
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import unstructured # noqa:F401
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except ImportError:
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raise ValueError(
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"unstructured package not found, please install it with "
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"`pip install unstructured`"
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)
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_valid_modes = {"single", "elements"}
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if mode not in _valid_modes:
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raise ValueError(
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f"Got {mode} for `mode`, but should be one of `{_valid_modes}`"
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)
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self.mode = mode
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@abstractmethod
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def _get_elements(self) -> List:
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"""Get elements."""
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@abstractmethod
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def _get_metadata(self) -> dict:
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"""Get metadata."""
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def load(self) -> List[Document]:
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"""Load file."""
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elements = self._get_elements()
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if self.mode == "elements":
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docs: List[Document] = list()
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for element in elements:
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metadata = self._get_metadata()
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# NOTE(MthwRobinson) - the attribute check is for backward compatibility
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# with unstructured<0.4.9. The metadata attributed was added in 0.4.9.
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if hasattr(element, "metadata"):
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metadata.update(element.metadata.to_dict())
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if hasattr(element, "category"):
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metadata["category"] = element.category
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docs.append(Document(page_content=str(element), metadata=metadata))
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elif self.mode == "single":
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metadata = self._get_metadata()
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text = "\n\n".join([str(el) for el in elements])
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docs = [Document(page_content=text, metadata=metadata)]
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else:
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raise ValueError(f"mode of {self.mode} not supported.")
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return docs
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class UnstructuredFileLoader(UnstructuredBaseLoader):
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"""Loader that uses unstructured to load files."""
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def __init__(self, file_path: str, mode: str = "single"):
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"""Initialize with file path."""
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self.file_path = file_path
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super().__init__(mode=mode)
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def _get_elements(self) -> List:
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from unstructured.partition.auto import partition
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return partition(filename=self.file_path)
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def _get_metadata(self) -> dict:
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return {"source": self.file_path}
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class UnstructuredFileIOLoader(UnstructuredBaseLoader):
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"""Loader that uses unstructured to load file IO objects."""
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def __init__(self, file: IO, mode: str = "single"):
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"""Initialize with file path."""
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self.file = file
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super().__init__(mode=mode)
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def _get_elements(self) -> List:
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from unstructured.partition.auto import partition
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return partition(file=self.file)
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def _get_metadata(self) -> dict:
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return {}
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