PdfWalkError(f"Cannot set {parent} as parent of {self}, parent is already {self.parent}")

[macdeport]

When analyzing this PDF in version 1.15.1 I encounter the following exception:

PdfWalkError-240930.pdf.zip

Traceback (most recent call last):
  File "/Users/alain/Library/Python/3.11/bin/pdfalyze", line 8, in <module>
    sys.exit(pdfalyze())
             ^^^^^^^^^^
  File "/Users/alain/Library/Python/3.11/lib/python/site-packages/pdfalyzer/__init__.py", line 43, in pdfalyze
    pdfalyzer = Pdfalyzer(args.file_to_scan_path)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/alain/Library/Python/3.11/lib/python/site-packages/pdfalyzer/pdfalyzer.py", line 57, in __init__
    self.walk_node(self.pdf_tree)
  File "/Users/alain/Library/Python/3.11/lib/python/site-packages/pdfalyzer/pdfalyzer.py", line 82, in walk_node
    self.walk_node(next_node)
  File "/Users/alain/Library/Python/3.11/lib/python/site-packages/pdfalyzer/pdfalyzer.py", line 82, in walk_node
    self.walk_node(next_node)
  File "/Users/alain/Library/Python/3.11/lib/python/site-packages/pdfalyzer/pdfalyzer.py", line 82, in walk_node
    self.walk_node(next_node)
  [Previous line repeated 7 more times]
  File "/Users/alain/Library/Python/3.11/lib/python/site-packages/pdfalyzer/pdfalyzer.py", line 77, in walk_node
    nodes_to_walk_next = [self._add_relationship_to_pdf_tree(r) for r in node.references_to_other_nodes()]
                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/alain/Library/Python/3.11/lib/python/site-packages/pdfalyzer/pdfalyzer.py", line 77, in <listcomp>
    nodes_to_walk_next = [self._add_relationship_to_pdf_tree(r) for r in node.references_to_other_nodes()]
                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/alain/Library/Python/3.11/lib/python/site-packages/pdfalyzer/pdfalyzer.py", line 133, in _add_relationship_to_pdf_tree
    from_node.set_parent(to_node)
  File "/Users/alain/Library/Python/3.11/lib/python/site-packages/pdfalyzer/decorators/pdf_tree_node.py", line 70, in set_parent
    raise PdfWalkError(f"Cannot set {parent} as parent of {self}, parent is already {self.parent}")
pdfalyzer.util.exceptions.PdfWalkError: Cannot set <7:StructElem:FACTURE_SIMM_NOUVEAU_FACO(Dictionary)> as parent of <98:StructElem:001_SIMM_FACTURE_VERSO(Dictionary)>, parent is already <8:K(Array)>

[michelcrypt4d4mus]

thanks for the bug report. StructElem as parent of a StructElem may be a data structure i've never encountered before. not sure i'll be able to fix this in the near future but if you want to take a look it's failing here.

[macdeport]

@michelcrypt4d4mus

not sure i'll be able to fix this in the near future

This is also my current situation ;-)

I was making this bug report mainly to inform you and provide you with the corresponding file that may be useful when the time comes.

Additional information:

The exception occurs when accessing '/Title' metadata.

The dictionary of this metadata, which pikepdf lists as follows:

  {'/Author': 'Registered to: EDF     ',
   '/CreationDate': 'D:20240904235439Z',
   '/Creator': 'OpenText Exstream Version 16.4.0 64-bit',
   '/Title': 'FACTURE_SIMM_NOUVEAU_FACO'
  }

I've already found pdfalyzer useful and thank you for this excellent tool.