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don't get confused by irrelevant bits of text inserted by PDF generation tools

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xenofem 2024-03-11 12:08:08 -04:00
parent 11ea5a0d58
commit 6b3982ecf0
1 changed files with 18 additions and 3 deletions
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21
dlibrary/dlibrary.py
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@ -79,6 +79,8 @@ IGNOREABLE_EXTENSIONS = ['.txt', '.html', '.htm', '.psd', '.mp4']
PDF_FALLBACK_DPI = 300
IRRELEVANT_PDF_BLOCK_REGEX = re.compile(r'\bTCPDF\b', re.I)
def open_zipfile_with_encoding(path):
try:
return zipfile.ZipFile(path, metadata_encoding="utf-8")
@ -437,9 +439,22 @@ class Collator:
return self.collate_from_paths(srcs_matching_language)
def is_single_image(page):
def block_is_image(block):
return block[6] == 1
def block_text(block):
return block[4]
def block_relevant(block):
return block_is_image(block) or not IRRELEVANT_PDF_BLOCK_REGEX.search(block_text(block))
def relevant_blocks(page):
blocks = page.get_text('blocks')
return len(blocks) == 1 and blocks[0][6] == 1
return [block for block in blocks if block_relevant(block)]
def is_single_image(page):
blocks = relevant_blocks(page)
return len(blocks) == 1 and block_is_image(blocks[0])
def extract_image(pdf, xref):
image = pdf.extract_image(xref)
@ -466,7 +481,7 @@ def pdf_images(pdf, force=False):
else:
yield extract_image(pdf, xref)
else:
print(f'\nPage {idx+1}: {len(page_images)} images, {len([img for img in page_images if img["xref"] == 0])} non-xref images, {len(page.get_text("blocks"))} total objects')
print(f'\nPage {idx+1}: {len(page_images)} images, {len([img for img in page_images if img["xref"] == 0])} non-xref images, {len(relevant_blocks(page))} total relevant objects')
if xref_mode:
raise ValueError
else: