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74 lines
2.2 KiB
Python
74 lines
2.2 KiB
Python
"""Loader that loads PDF files."""
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from typing import Any, List, Optional
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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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from langchain.document_loaders.unstructured import UnstructuredFileLoader
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class UnstructuredPDFLoader(UnstructuredFileLoader):
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"""Loader that uses unstructured to load PDF files."""
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def _get_elements(self) -> List:
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from unstructured.partition.pdf import partition_pdf
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return partition_pdf(filename=self.file_path)
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class PDFMinerLoader(BaseLoader):
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"""Loader that uses PDFMiner to load PDF files."""
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def __init__(self, file_path: str):
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"""Initialize with file path."""
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try:
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from pdfminer.high_level import extract_text # noqa:F401
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except ImportError:
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raise ValueError(
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"pdfminer package not found, please install it with "
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"`pip install pdfminer.six`"
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)
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self.file_path = file_path
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def load(self) -> List[Document]:
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"""Load file."""
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from pdfminer.high_level import extract_text
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text = extract_text(self.file_path)
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metadata = {"source": self.file_path}
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return [Document(page_content=text, metadata=metadata)]
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class PyMuPDFLoader(BaseLoader):
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"""Loader that uses PyMuPDF to load PDF files."""
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def __init__(self, file_path: str):
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"""Initialize with file path."""
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try:
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import fitz # noqa:F401
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except ImportError:
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raise ValueError(
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"PyMuPDF package not found, please install it with "
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"`pip install pymupdf`"
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)
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self.file_path = file_path
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def load(self, **kwargs: Optional[Any]) -> List[Document]:
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"""Load file."""
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import fitz
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doc = fitz.open(self.file_path) # open document
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return [
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Document(
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page_content=page.get_text(**kwargs).encode("utf-8"),
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metadata={
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"file_path": self.file_path,
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"page_number": page.number + 1,
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"total_pages": len(doc),
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}
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| doc.metadata,
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)
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for page in doc
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]
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