feat(joinir): Phase 224-D - ConditionAlias for promoted variable resolution
- Add ConditionAlias type to CarrierInfo (old_name → carrier_name) - Record aliases in DigitPosPromoter and TrimPatternInfo - Resolve aliases in Pattern2 ConditionEnv building - digit_pos now correctly resolves to is_digit_pos carrier Fixes "Variable 'digit_pos' not bound in ConditionEnv" error. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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# Phase 224: A-4 DigitPos Promoter - Implementation Summary
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**Date**: 2025-12-10
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**Status**: Core Implementation Complete, Integration Requires Additional Work
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**Status**: Core Implementation Complete(Phase 224-D まで反映済み、init MethodCall は別 Phase)
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**Branch**: main
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**Commits**: TBD
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@ -14,8 +14,9 @@ Phase 224 successfully implemented the **DigitPosPromoter** Box for A-4 pattern
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✅ **Complete**: DigitPosPromoter implementation with full unit test coverage (6/6 tests passing)
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✅ **Complete**: Integration into LoopBodyCondPromoter orchestrator
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✅ **Complete**: Two-tier promotion strategy (A-3 Trim → A-4 DigitPos fallback)
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✅ **Verified**: Promotion detection working correctly in Pattern2 pipeline
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⚠️ **Partial**: Full E2E flow blocked by lowerer integration issue
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✅ **Verified**: Promotion detection working correctly in Pattern2/4 pipeline
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✅ **Complete** (Phase 224-D): ConditionEnv alias bridge(`digit_pos` → `is_digit_pos`)実装
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⚠️ **Partial**: Full E2E flowは body-local init の MethodCall 制約で一部ブロック中
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---
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@ -61,7 +62,7 @@ Step 2: Try A-4 DigitPos promotion (DigitPosPromoter)
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Step 3: Fail-Fast with clear error message
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```
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**Logs Verify Success**:
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**Logs Verify Success(昇格フェーズ)**:
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```
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[cond_promoter] A-3 Trim promotion failed: No promotable Trim pattern detected
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[cond_promoter] Trying A-4 DigitPos promotion...
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@ -74,10 +75,10 @@ Step 3: Fail-Fast with clear error message
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## Current Limitation: Lowerer Integration Gap
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### Problem Statement
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### Problem Statement(当初) / Phase 224-D での一部解消
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**Symptom**: E2E test fails despite successful promotion
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**Root Cause**: `lower_loop_with_break_minimal` performs independent LoopBodyLocal check
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**Symptom(224 実装直後)**: E2E test fails despite successful promotion
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**Root Cause**: `lower_loop_with_break_minimal` performs independent LoopBodyLocal check
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**Result**: Promoted variables are detected as "unsupported" by the lowerer
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### Error Flow
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@ -108,29 +109,32 @@ But for A-4 DigitPos (Phase 223.5), we:
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- Merge carrier into CarrierInfo ✅
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- **BUT**: Break condition AST still contains `digit_pos` ❌
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### Root Cause Analysis
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### Root Cause Analysis(Phase 224 時点)
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The break condition is an **AST node** containing:
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```nyash
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if digit_pos < 0 { break }
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```
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After promotion:
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After promotion(224 時点):
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- CarrierInfo knows about `is_digit_pos` carrier ✅
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- LoopBodyCondPromoter recorded the promotion ✅
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- **But**: AST node still says `digit_pos`, not `is_digit_pos` ❌
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- **But**: AST node still says `digit_pos`, not `is_digit_pos` → ConditionEnv から `digit_pos` が見えない ❌
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When lower_loop_with_break_minimal analyzes the condition:
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```rust
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let cond_scope = LoopConditionScopeBox::analyze(&conditions);
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if cond_scope.has_loop_body_local() {
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// ERROR: Still sees "digit_pos" in AST!
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}
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```
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Phase 224-D では AST を直接書き換えるのではなく、
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**ConditionAlias(old_name → carrier_name)を CarrierInfo/ConditionEnv に導入する**ことで
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「`digit_pos` という名前で条件式から参照された場合も、内部的には `is_digit_pos` carrier を読む」
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というブリッジを追加している。
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これにより:
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- LoopBodyLocal 昇格後に `digit_pos < 0` のような条件があっても、
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ConditionEnvBuilder が ConditionAlias を介して `is_digit_pos` の ValueId に解決できるようになった。
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- 「LoopBodyLocal が条件にあることによる not‑bound エラー」は解消され、
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**現時点の Blocker は body‑local init MethodCall(substring など)の lowering 制約だけ**になった。
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---
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## Solution Options (Phase 224-continuation)
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## Solution Options (Phase 224-continuation 時点の整理)
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### Option A: AST Rewriting (Comprehensive)
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@ -146,30 +150,26 @@ if cond_scope.has_loop_body_local() {
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**Cons**: AST rewriting is complex, error-prone
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**Effort**: ~2-3 hours
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### Option B: Promoted Variable Tracking (Surgical)
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### Option B: Promoted Variable Tracking + ConditionAlias(採用済み)
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**Approach**: Add metadata to track promoted variables, exclude from LoopBodyLocal check
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**Approach(決定案)**:
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LoopBodyLocal を carrier に昇格した事実を **CarrierInfo(promoted_loopbodylocals + ConditionAlias)** に
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メタデータとして記録し、ConditionEnvBuilder 側で「元の変数名 → carrier 名」のエイリアスを解決する。
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**Implementation**:
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1. Add `promoted_loopbodylocals: Vec<String>` to CarrierInfo
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2. In Phase 223.5, record `promoted_var` in CarrierInfo
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3. Modify lower_loop_with_break_minimal signature:
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```rust
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fn lower_loop_with_break_minimal(
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...,
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promoted_vars: &[String], // NEW
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) -> Result<...>
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```
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4. In LoopConditionScopeBox::analyze(), filter out promoted_vars:
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```rust
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if cond_scope.has_loop_body_local_except(promoted_vars) {
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// Only error if non-promoted LoopBodyLocal exists
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}
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```
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実装(Phase 224-cont / 224-D):
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1. `CarrierInfo` に `promoted_loopbodylocals: Vec<String>` と `condition_aliases: Vec<ConditionAlias>` を追加。
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2. LoopBodyCondPromoter(Trim/DigitPos の両方)で昇格成功時に
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`promoted_loopbodylocals.push("digit_pos")` と
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`condition_aliases.push(ConditionAlias { old_name: "digit_pos", carrier_name: "is_digit_pos" })` を記録。
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3. Pattern2/4 lowerer は ConditionEnvBuilder v2 を呼ぶ際に `&carrier_info.condition_aliases` を渡す。
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4. ConditionEnvBuilder は `var_name == "digit_pos"` のような未解決変数を見つけた場合、
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ConditionAlias を使って `carrier_name == "is_digit_pos"` に解決し、その ValueId を Condition 役の Param としてバインド。
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**Pros**: Minimal changes, surgical fix
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**Cons**: Adds parameter to lowerer API
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**Effort**: ~1-2 hours
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効果:
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- LoopBodyLocal 条件パターン(A-3 Trim/A-4 DigitPos)は、
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**AST 書き換えなしで「条件式から見える名前」と「carrier 実体」を橋渡しできる**。
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- Pattern2/4 や LoopConditionScopeBox は「昇格済み LoopBodyLocal」とそれ以外を区別できるようになり、
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不要な Fail‑Fast を避けつつ、未昇格の LoopBodyLocal には引き続き厳格に対応できる。
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### Option C: DigitPosLoopHelper Metadata (Consistent)
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@ -341,7 +341,8 @@ Local Region (1000+):
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- **Two-tier promotion**: Step1 で A-3 Trim 試行 → 失敗なら Step2 で A-4 DigitPos 試行 → 両方失敗で Fail-Fast。
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- **DigitPosPromoter 統合**: cascading indexOf パターン(substring → indexOf → comparison)の昇格をサポート。
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- **Unit test 完全成功**: 6/6 PASS(promoter 自体は完璧動作)。
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- **Lowerer Integration Gap**: lower_loop_with_break_minimal が昇格済み変数を認識せず、独立チェックでエラー検出(Phase 224-continuation で対応予定)。
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- **Phase 224-D**: ConditionAlias/CarrierInfo との連携により、昇格済み LoopBodyLocal 名(`digit_pos` 等)を ConditionEnv から見えるようにブリッジ。
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- **残りの制約**: body-local init の MethodCall(`substring` 等)の lowering は Phase 193/224-B/C のスコープ外で、今後の Phase で対応。
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- 設計原則:
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- **Thin coordinator**: 専門 Promoter(LoopBodyCarrierPromoter / DigitPosPromoter)に昇格ロジックを委譲。
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- **Pattern-agnostic**: Pattern2 (break) / Pattern4 (continue) の統一入口として機能。
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