fix: drop processing instructions in HTML parser#4361
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partition_html() crashed with 'lxml.etree._ProcessingInstruction object has no attribute is_phrasing' when the document contained a processing instruction such as '<?xml ...?>'. The HTML parser's element-class lookup only maps real elements, so a processing instruction reaches the tree as a plain lxml _ProcessingInstruction node without the parser's custom interface, then crashes the phrasing/flow iteration. Pass remove_pis=True to the HTMLParser so processing instructions are stripped during parsing, mirroring the existing remove_comments=True. They carry no rendered text, so dropping them matches browser behavior. Fixes Unstructured-IO#4358
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Shadow auto-approve: would auto-approve. This PR adds a single parameter remove_pis=True to the HTML parser, mirroring the existing remove_comments=True, to safely drop processing instructions and prevent an AttributeError crash with no change to business logic or data flow.
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…#4358) The markdown entry path routes through the same HTML parser, so add a regression test that exercises partition_md directly with a <?xml ?> PI.
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Shadow auto-approve: would auto-approve. This change adds a single parameter to drop processing instructions during HTML parsing, fixing a specific crash without affecting other functionality, and includes regression tests.
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Summary
partition_html()crashes when the input contains a processing instruction such as<?xml version="1.0" encoding="UTF-8"?>:Closes #4358.
Root cause
The HTML parser (
unstructured/partition/html/parser.py) assigns custom element classes viaElementNamespaceClassLookupwith anElementDefaultClassLookup(element=DefaultElement)fallback. That fallback only covers elements — a processing instruction reaches the tree as a plainlxml.etree._ProcessingInstructionnode, which lacks the parser's custom interface (.is_phrasing). Phrasing/flow iteration then hitswhile q and q[0].is_phrasing:and raisesAttributeError.Fix
Add
remove_pis=True, mirroring the existingremove_comments=True. Processing instructions carry no rendered text, so stripping them at parse time matches browser behavior and keeps non-element nodes out of the element iteration entirely (a single-point fix rather than guarding every iteration site).Tests
test_partition_html_ignores_processing_instructions(regression for bug/xml indentation causes parsing error #4358): a<?xml ...?>inside the body no longer crashes and the surrounding text is extracted. Fails onmain(AttributeError), passes with the fix.test_parser.py+test_partition.pysuites: 236 passed, no new failures (one unrelated pre-existing failure,test_partition_html_on_ideas_page, fails identically onmainin this environment).ruff check/ruff format --checkclean; bumped__version__+CHANGELOG.mdto 0.22.32 per CONTRIBUTING.Summary by cubic
Fixes a crash in
partition_html()andpartition_md()when documents include processing instructions like<?xml ...?>. We now drop them during HTML parsing to preventAttributeErrorand match browser behavior.remove_pis=Truetolxml.etree.HTMLParserto drop processing instructions and avoid_ProcessingInstructionnodes without.is_phrasing. Fixes bug/xml indentation causes parsing error #4358.Written for commit aa7c725. Summary will update on new commits.