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import os
import pymupdf
root = os.path.abspath(f'{__file__}/../..')
def test_2548():
"""Text extraction should fail because of PDF structure cycle.
Old MuPDF version did not detect the loop.
"""
print(f'test_2548(): {pymupdf.mupdf_version_tuple=}')
pymupdf.TOOLS.mupdf_warnings(reset=True)
doc = pymupdf.open(f'{root}/tests/resources/test_2548.pdf')
e = False
for page in doc:
try:
_ = page.get_text()
except Exception as ee:
print(f'test_2548: {ee=}')
if hasattr(pymupdf, 'mupdf'):
# Rebased.
expected = "RuntimeError('code=2: cycle in structure tree')"
else:
# Classic.
expected = "RuntimeError('cycle in structure tree')"
assert repr(ee) == expected, f'Expected {expected=} but got {repr(ee)=}.'
e = True
wt = pymupdf.TOOLS.mupdf_warnings()
print(f'test_2548(): {wt=}')
# This checks that PyMuPDF 1.23.7 fixes this bug, and also that earlier
# versions with updated MuPDF also fix the bug.
rebased = hasattr(pymupdf, 'mupdf')
if pymupdf.mupdf_version_tuple >= (1, 25):
expected = 'format error: cycle in structure tree\nstructure tree broken, assume tree is missing'
else:
expected = 'Loop found in structure tree. Ignoring structure.'
if rebased:
assert wt == expected, f'expected:\n {expected!r}\nwt:\n {wt!r}\n'
assert not e
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