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Default light extraction to direct OOXML - #156
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Included review availability: This review used your included allowance. Your plan provides up to 2 included reviews per hour; 0 remain after this review. 📝 WalkthroughWalkthroughLight-mode ChangesLight-mode OOXML extraction
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~60 minutes Change: Refactor Sequence Diagram(s)sequenceDiagram
participant Caller
participant run_extraction_pipeline
participant OoxmlExtractionSession
participant _run_openpyxl_pipeline
Caller->>run_extraction_pipeline: light-mode .xlsx or .xlsm request
run_extraction_pipeline->>OoxmlExtractionSession: extract core and rich data
OoxmlExtractionSession-->>run_extraction_pipeline: workbook data and artifacts
run_extraction_pipeline->>_run_openpyxl_pipeline: restart on compatibility selection or direct-stage failure
_run_openpyxl_pipeline-->>Caller: compatibility extraction result
Merge Risk: 🔵 Low · up to Light-mode xlsx/xlsm extraction now uses a new direct parsing path. No concrete defects were found, and unsupported cases fall back to the previous pipeline. Output parity on real-world workbooks beyond the tested fixtures remains worth watching after merge. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to The inspected paths preserve data-only extraction, resource cleanup and complete restart after propagated failures. No introduced security vulnerability was established, but protection parity for hostile workbooks has not been fully verified. Retained concerns Security review detailsSecurity Blast Radius
Trust Boundaries and Controls
Resilience and Maintainability Implications
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 66.34% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 101 functions across 17 files. (1 skipped: 1 unsupported.)
✨ Finishing Touches 💡 2📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
🛠️ Fix failing CI checks 💡
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Up to standards ✅🟢 Issues
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| Metric | Results |
|---|---|
| Complexity | 233 |
| Duplication | 0 |
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| def _merge_at(self, row: int, column: int) -> tuple[int, int, int, int] | None: | ||
| """Return the merge covering a coordinate, if present.""" | ||
| return next( | ||
| ( | ||
| bounds | ||
| for bounds in self._merges | ||
| if bounds[1] <= row <= bounds[3] and bounds[0] <= column <= bounds[2] | ||
| ), | ||
| None, |
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🔴 Merged sheets stall table detection
On a densely scanned sheet with many merges, _merge_at tests every merge for each cell. A 1,000,000-cell scan with 500 merges can require 500 million containment checks before table candidates return.
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Light extraction builds a worksheet view and passes it to detect_tables_openpyxl_ws. Its border scanner reads every cell in the selected rectangle via load_border_maps_openpyxl_ws, up to the configured 5,000-row and 200-column limits. Each read currently searches all merged ranges, even if no merge covers that coordinate. This makes the direct path's work proportional to scanned cells times merged ranges; reading candidate values repeats the search.
Example: A sheet with 500 merges and populated or bordered cells throughout 5,000 rows and 200 columns scans one million cells. The merge lookup alone can test up to 500 million ranges, instead of making roughly one lookup per cell.
Recommended fix: Index merged ranges by relevant row or column intervals when constructing _OoxmlWorksheetView, then use that index in _merge_at. Preserve the existing anchor and inherited-border behavior and add a dense-sheet/many-merges regression or bounded-work test.
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Actionable comments posted: 1
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Inline comments:
Review comments at @src/exstruct/core/ooxml_session.py:
- Around line 295-304: Update the merge lookup used by `_merge_at` to avoid
scanning every entry in `_merges` for each coordinate. Build an index once
during initialization—preferably row-bucketed column intervals to avoid
expanding large merges—and have `_merge_at` use that index while preserving the
current first-match behavior for overlaps.
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ℹ️ Review info
⚙️ Run configuration
- Configuration used: defaults
- Review profile: CHILL
- Plan: Advanced
- Run ID:
150bd150-1231-4af1-9ba3-2e4f70923d1b
📒 Files selected for processing (37)
CHANGELOG.mdREADME.ja.mdREADME.mdbenchmark/baselines/issue150-2026-10-03-windows.jsonbenchmark/issue150-results.mdbenchmark/issue150_light.pybenchmark/performance.pybenchmark/performance_profile.pydev-docs/adr/ADR-0011-extraction-scoped-workbook-reuse-and-direct-cell-reading.mddev-docs/adr/ADR-0012-optional-scipy-border-clustering.mddev-docs/adr/ADR-0013-default-ooxml-backend-for-light-extraction.mddev-docs/adr/README.mddev-docs/adr/decision-map.mddev-docs/adr/index.yamldev-docs/adr/reviews/ADR-0013-2026-10-03.mddev-docs/architecture/pipeline.mddev-docs/roadmap.mddev-docs/specs/excel-extraction.mddev-docs/specs/extraction-performance.mddev-docs/specs/ooxml-core-extraction.mddev-docs/testing/test-requirements.mddocs/api.mddocs/cli.mdsrc/exstruct/core/backends/ooxml_backend.pysrc/exstruct/core/backends/openpyxl_backend.pysrc/exstruct/core/cells.pysrc/exstruct/core/ooxml_scalars.pysrc/exstruct/core/ooxml_session.pysrc/exstruct/core/pipeline.pysrc/exstruct/core/ranges.pysrc/exstruct/errors.pytests/benchmark/test_performance.pytests/core/test_backend_import_isolation.pytests/core/test_light_ooxml_pipeline.pytests/core/test_ooxml_merged_order_session.pytests/core/test_ooxml_scalars.pytests/core/test_ooxml_table_candidates_session.py
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Summary
Default
mode="light"extraction of supported.xlsxand.xlsmworkbooks now reads OOXML directly through one shared extraction session. The normal path imports none of openpyxl, xlwings, pandas, or SciPy and opens one ZIP archive instead of two.Closes #150.
Tests
uv run --extra all pytest -m 'not com and not render and not libreoffice' -q --tb=short --cov=exstruct --cov-report=term --cov-fail-under=80: 1,077 passed, 12 deselected; coverage 83.97%.uv run ruff check . --no-fixand strict mypy: passed. Commit hooks also passed.git diff --check: passed. All seven performance-spec and report rows match the final raw JSON, including rounding and metric ordering.gpt-6-luna,xhigh): Pass 1 found one stale documentation table; fixed in998f922. Pass 2 PASS, with no new findings. Pass 2 checked the documentation fix; it did not rerun the implementation test suite.Validation limits
Summary by CodeRabbit
.xlsxand.xlsmworkbooks directly, including cell data, formulas, print areas, tables, and best-effort drawings.