const initialize certain variable and optimize the look up for valid initial final

[wengxt]

Summary by CodeRabbit

• Performance Improvements

  • Improved Pinyin encoding and lookup efficiency.
  • Reduced temporary conversions and memory overhead during initial/final matching.
  • Optimized validation of supported Pinyin combinations for faster processing.

• Compatibility

  • Existing Pinyin behavior and supported combinations remain unchanged.
  • Updated an older interface designation to reflect its deprecated status.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: f616a86e-ec60-4582-a104-7b9bbd3b5934

📥 Commits

Reviewing files that changed from the base of the PR and between c8fa490 and fa05aed.

📒 Files selected for processing (4)

• src/libime/pinyin/pinyindata.cpp
• src/libime/pinyin/pinyindata.h
• src/libime/pinyin/pinyindata_p.h
• src/libime/pinyin/pinyinencoder.cpp

Included review availability: Your plan includes up to 1 review per rolling hour; 0 remain after this review.

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📝 Walkthrough

Walkthrough

The pinyin encoder now uses compile-time fixed-size arrays for initial, final, and validity lookups. Runtime lookup construction and temporary string conversions were removed. The exported validity accessor is marked deprecated.

Changes

Pinyin lookup modernization

Layer / File(s)	Summary
Compile-time validity table src/libime/pinyin/pinyindata_p.h, src/libime/pinyin/pinyindata.cpp, src/libime/pinyin/pinyindata.h	validInitialFinal provides the 1,500-entry validity table. getEncodedInitialFinal() copies this table into its vector result and uses the deprecated export annotation.
Encoder lookup and conversion paths src/libime/pinyin/pinyinencoder.cpp	Initial and final tables use std::array and std::string_view. Bimaps and string conversions use direct array data. longestMatch avoids a temporary string, and validation reads validInitialFinal directly.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Merge Risk: ⚪ Minimal · up to fa05a

The change preserves the existing validity index set, and no actionable merge-blocking risk remains after normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title identifies the constant initialization and lookup optimization for valid initial/final combinations, which are the main changes.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.

✨ 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 const

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