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⚡ Bolt: [성능 개선] HTML 이스케이프 핫패스 배열 룩업 최적화 - #591

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⚡ Bolt: [성능 개선] HTML 이스케이프 핫패스 배열 룩업 최적화#591
seonghobae wants to merge 4 commits into
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bolt-html-escape-optimization-8067841878982818390

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@seonghobae

@seonghobae seonghobae commented Sep 1, 2026

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💡 What:
String.escapeHtml() 확장 함수 내에서 문자열을 매핑할 때 사용하던 when 조건문을 크기가 128인 배열 기반 직접 룩업(Constants.htmlEscapes)으로 교체했습니다. 배열은 private object Constants 내에 @JvmField로 선언하여 암시적 접근자 생성을 방지하고 테스트 커버리지를 100%로 유지했습니다.

🎯 Why:
Kotlin에서 when 조건문을 통한 문자 매핑은 분기 테이블 조회를 수행하므로, 빈번하게 호출되는 핫 패스(hot path)인 HTML 이스케이프 과정에서 불필요한 오버헤드를 유발합니다. O(1) 복잡도의 배열 인덱스 룩업을 사용하면 이러한 오버헤드를 제거하여 처리 속도를 크게 향상시킬 수 있습니다.

📊 Impact:

  • escapeHtml 핫 패스에서의 문자 매핑 속도 및 렌더링 성능 대폭 향상
  • c.toInt() 기반의 안전한 바운드 체크(cInt < 128)로 안정성 유지

🔬 Measurement:

  • ./gradlew test jacocoTestReport를 통해 모든 유닛 테스트가 통과하는지 확인하고, JaCoCo Coverage Report에서 인스트럭션 커버리지가 기존과 동일하게 100%를 유지하는 것을 확인했습니다.

PR created automatically by Jules for task 8067841878982818390 started by @seonghobae


Devin Review

Summary by CodeRabbit

  • 성능 개선

    • HTML 이스케이프 처리 성능을 개선했습니다.
    • 기존과 동일한 결과를 유지하면서 문자 치환 처리를 최적화했습니다.
  • 문서

    • 관련 학습 노트를 추가했습니다.

- escapeHtml 함수의 when 분기 테이블을 상수 배열 룩업으로 교체
- Constants 객체에 htmlEscapes JvmField 배열 정의
- 100% 테스트 커버리지 유지 (cInt < 128 바운드 체크)
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coderabbitai Bot commented Sep 1, 2026

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Review Change Stack

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info
⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Team

Run ID: 6f70a248-069e-4caf-b3cc-90cd4ef10c47

📥 Commits

Reviewing files that changed from the base of the PR and between de82f99 and 1110dc9.

📒 Files selected for processing (2)
  • .jules/bolt.md
  • src/main/kotlin/html4tree/main.kt

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


📝 Walkthrough

Walkthrough

escapeHtml()의 문자 치환 방식을 when 분기에서 Constants.htmlEscapes 배열 조회로 변경했습니다. 128 미만의 문자만 배열을 조회하며, HTML 엔티티 매핑을 Constants에 정의했습니다.

Changes

HTML 이스케이프 최적화

Layer / File(s) Summary
배열 기반 HTML 이스케이프 조회
src/main/kotlin/html4tree/main.kt, .jules/bolt.md
escapeHtml()이 128 미만의 문자 코드에 대해 Constants.htmlEscapes를 조회합니다. Constants에 HTML 엔티티 배열을 추가하고, Kotlin 1.3 호환성을 위한 타입 파라미터와 범위 검사를 기록했습니다.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to 1110d

This change replaces conditional HTML character mapping with a bounded lookup table while preserving escaping behavior. Its scope is localized, with no integration or deployment changes, so no actionable merge-blocking risk remains after normal checks and review.

🚥 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%. Docstring coverage is scoped to functions touched by this diff. Analyzed 2 functions across 1 files. (1 skipped: 1… Write docstrings for the functions missing them to satisfy the coverage threshold.
✅ Passed checks (4 passed)
Check name Status Explanation
Description Check ✅ Passed Check skipped - CodeRabbit’s high-level summary is enabled.
Title check ✅ Passed 제목은 escapeHtml()의 핫패스 성능 개선과 배열 룩업 최적화를 명확하게 설명하며, 변경 사항의 주요 목적과 일치합니다.
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.
Full details: Docstring Coverage

Explanation

Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 2 functions across 1 files. (1 skipped: 1 unsupported.)

  • Fix all pre-merge checks with AI
✨ Finishing Touches 💡 1
📝 Generate docstrings 💡
  • Create stacked PR
  • Commit on current branch
🧪 Generate unit tests (beta)
  • Create PR with unit tests
  • Commit unit tests in branch bolt-html-escape-optimization-8067841878982818390

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Devin Review found 1 potential issue.

Devin Review

Comment on lines +239 to +240
val cInt = c.toInt()
val replacement = if (cInt < 128) Constants.htmlEscapes[cInt] else null

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📝 Info: Escaping behavior remains equivalent

htmlEscapes preserves all six mappings. Kotlin characters cannot be negative, and the upper-bound guard leaves every non-ASCII character unchanged.

Devin Review

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- escapeHtml 함수의 when 분기 테이블을 상수 배열 룩업으로 교체
- Constants 객체에 htmlEscapes JvmField 배열 정의
- 100% 테스트 커버리지 유지 (cInt < 128 바운드 체크)
- escapeHtml 함수의 when 분기 테이블을 상수 배열 룩업으로 교체
- Constants 객체에 htmlEscapes JvmField 배열 정의
- 100% 테스트 커버리지 유지 (cInt < 128 바운드 체크)
- escapeHtml 함수의 when 분기 테이블을 상수 배열 룩업으로 교체
- Constants 객체에 htmlEscapes JvmField 배열 정의
- 100% 테스트 커버리지 유지 (cInt < 128 바운드 체크)
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