feat: pre-5.0 converter hardening — cross-source universal parity in Python#46
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…Python Every Python converter now consumes a universal document from ANY source parser without losing content, gated by a new cross-source fidelity matrix (3 real fixtures × 14 targets): 34 of 39 pairs failed at baseline, all 39 now pass, almost all at 100% content survival. - tests/python/test_universal_matrix.py: the Python analog of the PHP 182-pair matrix (measure_fidelity floor 0.9 per pair) - interchange.py now bidirectional: element_to_component / document_to_components mirror DEVTB_Universal (reverse direction) - Structural recursion in all converters: nested section>container>column shapes convert correctly; bare widgets get valid column wrappers - Canonical widget vocabulary across all 14 converters with content-preserving fallbacks (no empty elements for unmapped widgets) - kadence/thrive route universal input through the reverse interchange into their component pipelines (+ content-rescue graft) - Elementor4Converter.convert() returns structured nodes, not a JSON string; galleries preserve URLs over site-local media ids - Fidelity metric: style keys excluded from content; JSON outputs compare via decoded string scalars Suites: Python 306 · PHP 344/5,691 · matrix 39/39 · 3 e2e smokes × 2 engines — all green. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Summary
Pre-5.0 tranche: every Python converter now consumes a universal document from any source parser without losing content — bringing the Python engine to parity with the PHP engine's 182-pair coverage before the 5.0.0 breaking release.
The gate
New cross-source fidelity matrix (
tests/python/test_universal_matrix.py): 3 real fixtures (Elementor kitchen-sink, DIVI kitchen-sink, real Breakdance export) × 14 target converters,measure_fidelityfloor 0.9 per pair. Baseline: 34 of 39 pairs failed. Now: all 39 pass, almost all at 100%.Changes
translation_bridge.interchangegainselement_to_component/document_to_components— the Python mirror ofDEVTB_Universal's reverse direction. Both engines' vocabularies now mirror in both directions.section > container > columnshapes, canonical widget vocabulary, content-preserving fallbacks — no empty elements for unmapped widgets). kadence/thrive route universal input through the reverse interchange into their existing component pipelines.title_color, …) no longer count as content; JSON-shaped outputs compare via decoded string scalars so escaping/multi-line strings never read as loss.Elementor4Converter.convert()returns the structured atomic node list instead of a pre-encoded JSON string (the CLI serializes on write as before).Built with 5 parallel subagents on disjoint converter files, each independently verified against the matrix; final verification run end-to-end on the merged tree.
Test evidence
Python 306 passed (+44) · PHPUnit 344/5,691 · matrix 39/39 · 3 e2e smokes × 2 engines — all green.
🤖 Generated with Claude Code