⚡ Bolt: [performance improvement] optimize _decode_yenc_lines

[xbmc4lyfe]

💡 What: Replaced the byte-by-byte Python iteration in _decode_yenc_lines with C-level string operations (bytes.translate and bytes.find).
🎯 Why: Python loops are notoriously slow. Using built-in methods offloads the heavy lifting to C, dramatically reducing interpreter overhead.
📊 Impact: Expected ~3-4x speedup for decoding yEnc data during deep checks. Benchmarked 2.22s -> 0.59s locally.
🔬 Measurement: Run a verification with the --deep-check flag on a large NZB and compare the elapsed time in the deep: summary.

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PR created automatically by Jules for task 7274060205135727280 started by @xbmc4lyfe

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 70c4b2e8-bf14-4fa9-8aca-1b18446e39d6

📥 Commits

Reviewing files that changed from the base of the PR and between 09ccc06 and 007e558.

📒 Files selected for processing (1)

• verify_nzb.py

📜 Recent review details

🔇 Additional comments (1)

verify_nzb.py (1)

118-146: LGTM!

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📝 Walkthrough

Summary by CodeRabbit

• Refactor
  • Optimized yEnc body decoding with improved parsing efficiency and faster data processing while preserving validation checks.

Walkthrough

The yEnc body decoder in verify_nzb.py has been optimized by introducing a precomputed 256-byte lookup table (_YENC_NORMAL_TABLE) and rewriting _decode_yenc_lines to use efficient bytes.translate for bulk decoding and targeted parsing around escape sequences, while maintaining the same dangling-escape error behavior.

Changes

yEnc Decoder Optimization

Layer / File(s)	Summary
Optimized yEnc decoding with lookup table verify_nzb.py	Introduced _YENC_NORMAL_TABLE, a 256-byte precomputed translation table, and rewrote _decode_yenc_lines to use bytes.translate for bulk non-escape decoding and targeted find/index arithmetic for escape sequences, preserving the dangling-escape ValueError behavior.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Poem

🐰 A rabbit hops through bytes with glee,
With lookup tables swift and free—
The yEnc dance now prances fast,
Old escape clues of the past,
Translate and find make haste! ✨

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change—optimizing yEnc decoding performance—and aligns with the substantial refactoring of the _decode_yenc_lines function.
Description check	✅ Passed	The description is directly related to the changeset, explaining the motivation (C-level string operations vs. Python loops), expected impact (3-4x speedup), and concrete measurement guidance.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch bolt-optimize-yenc-decode-7274060205135727280

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch bolt-optimize-yenc-decode-7274060205135727280

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