Method iter_valid_rels

src/pptx/opc/package.py:555–566

Filter out broken relationships such as those pointing to NULL.

()

        """Replace any relationships in this collection with those from `xml_rels`."""

        def iter_valid_rels():
            """Filter out broken relationships such as those pointing to NULL."""
            for rel_elm in xml_rels.relationship_lst:
                # --- Occasionally a PowerPoint plugin or other client will "remove"
                # --- a relationship simply by "voiding" its Target value, like making
                # --- it "/ppt/slides/NULL". Skip any relationships linking to a
                # --- partname that is not present in the package.
                if rel_elm.targetMode == RTM.INTERNAL:
                    partname = PackURI.from_rel_ref(base_uri, rel_elm.target_ref)
                    if partname not in parts:
                        continue
                yield _Relationship.from_xml(base_uri, rel_elm, parts)

        self._rels.clear()
        self._rels.update((rel.rId, rel) for rel in iter_valid_rels())