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120 lines
4.5 KiB
Python
120 lines
4.5 KiB
Python
"""Loader that uses unstructured to load HTML files."""
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import logging
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from typing import Any, 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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logger = logging.getLogger(__name__)
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class UnstructuredURLLoader(BaseLoader):
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"""Loader that uses unstructured to load HTML files."""
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def __init__(
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self,
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urls: List[str],
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continue_on_failure: bool = True,
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mode: str = "single",
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**unstructured_kwargs: Any,
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):
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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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from unstructured.__version__ import __version__ as __unstructured_version__
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self.__version = __unstructured_version__
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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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self._validate_mode(mode)
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self.mode = mode
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headers = unstructured_kwargs.pop("headers", {})
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if len(headers.keys()) != 0:
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warn_about_headers = False
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if self.__is_non_html_available():
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warn_about_headers = not self.__is_headers_available_for_non_html()
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else:
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warn_about_headers = not self.__is_headers_available_for_html()
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if warn_about_headers:
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logger.warning(
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"You are using an old version of unstructured. "
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"The headers parameter is ignored"
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)
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self.urls = urls
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self.continue_on_failure = continue_on_failure
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self.headers = headers
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self.unstructured_kwargs = unstructured_kwargs
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def _validate_mode(self, mode: str) -> None:
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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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def __is_headers_available_for_html(self) -> bool:
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_unstructured_version = self.__version.split("-")[0]
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unstructured_version = tuple([int(x) for x in _unstructured_version.split(".")])
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return unstructured_version >= (0, 5, 7)
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def __is_headers_available_for_non_html(self) -> bool:
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_unstructured_version = self.__version.split("-")[0]
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unstructured_version = tuple([int(x) for x in _unstructured_version.split(".")])
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return unstructured_version >= (0, 5, 13)
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def __is_non_html_available(self) -> bool:
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_unstructured_version = self.__version.split("-")[0]
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unstructured_version = tuple([int(x) for x in _unstructured_version.split(".")])
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return unstructured_version >= (0, 5, 12)
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def load(self) -> List[Document]:
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"""Load file."""
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from unstructured.partition.auto import partition
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from unstructured.partition.html import partition_html
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docs: List[Document] = list()
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for url in self.urls:
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try:
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if self.__is_non_html_available():
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if self.__is_headers_available_for_non_html():
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elements = partition(
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url=url, headers=self.headers, **self.unstructured_kwargs
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)
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else:
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elements = partition(url=url, **self.unstructured_kwargs)
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else:
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if self.__is_headers_available_for_html():
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elements = partition_html(
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url=url, headers=self.headers, **self.unstructured_kwargs
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)
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else:
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elements = partition_html(url=url, **self.unstructured_kwargs)
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except Exception as e:
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if self.continue_on_failure:
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logger.error(f"Error fetching or processing {url}, exeption: {e}")
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continue
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else:
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raise e
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if self.mode == "single":
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text = "\n\n".join([str(el) for el in elements])
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metadata = {"source": url}
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docs.append(Document(page_content=text, metadata=metadata))
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elif self.mode == "elements":
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for element in elements:
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metadata = element.metadata.to_dict()
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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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return docs
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