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read_pdf.py
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Thu, Feb 6, 14:31

read_pdf.py
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from langchain_community.document_loaders import PyPDFLoader
import os
# from langchain.document_loaders import PyPDFLoader
from pdf2image import convert_from_path
import pytesseract
from langchain.schema import Document
def read_pdf(pdf_path):
'''returns a list of pages from the pdf file
each page has two props: page_number and page_content
'''
real_pages = []
# First attempt: Use PyPDFLoader
try:
loader = PyPDFLoader(pdf_path)
pages = loader.load_and_split()
last_page_index = -1
for page in pages:
print(f"Page {page.metadata['page']}: {page.page_content[:100]}...")
print('real_pages:', len(real_pages))
page_index = page.metadata['page']
if page_index == last_page_index:
real_pages[-1].page_content += page.page_content
else:
real_pages.append(page)
last_page_index = page_index
except Exception as e:
print(f'Error reading pdf {pdf_path} with PyPDFLoader: {e}')
# If PyPDFLoader failed or returned empty results, try OCR
if not real_pages:
print('PyPDFLoader failed or returned no pages. Attempting to read PDF using OCR...')
try:
ocr_text = ocr_scanned_pdf(pdf_path)
# Split the OCR text into pages
ocr_pages = ocr_text.split('--- Page')
for i, page_content in enumerate(ocr_pages[1:], start=1): # Skip the first split as it's empty
page_content = page_content.strip()
if page_content:
real_pages.append(Document(page_content=page_content, metadata={'page': i}))
except Exception as ocr_error:
print(f'Error reading pdf {pdf_path} with OCR: {ocr_error}')
return real_pages
def ocr_scanned_pdf(pdf_path):
text = ""
images = convert_from_path(pdf_path)
for i, image in enumerate(images):
page_text = pytesseract.image_to_string(image)
print(f"OCR result for page {i+1}: {page_text[:100]}...")
text += f"--- Page {i+1} ---\n{page_text}\n\n"
return text
if __name__ == '__main__':
# add current repo to path
pdf_path = '''./data/LEX_001.pdf'''
pages = read_pdf(pdf_path)
#concatenate all pages
text = ''
for page in pages:
text += page.page_content + '\n'
#save to file
with open('./data/LEX_001.txt', 'w') as f:
f.write(text)
print(pages)

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