feat(joinir): Phase 171-C-2 Trim pattern detection in LoopBodyCarrierPromoter
Implements the Trim pattern detection logic for carrier promotion:
- find_definition_in_body(): Iterative AST traversal to locate variable definitions
- is_substring_method_call(): Detects substring() method calls
- extract_equality_literals(): Extracts string literals from OR chains (ch == " " || ch == "\t")
- TrimPatternInfo: Captures detected pattern details for carrier promotion
This enables Pattern 5 to detect trim-style loops:
```hako
loop(start < end) {
local ch = s.substring(start, start+1)
if ch == " " || ch == "\t" || ch == "\n" || ch == "\r" {
start = start + 1
} else {
break
}
}
```
Unit tests cover:
- Simple and nested definition detection
- substring method call detection
- Single and chained equality literal extraction
- Full Trim pattern detection with 2-4 whitespace characters
Next: Phase 171-C-3 integration with Pattern 2/4 routing
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
nyash-codex
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docs/development/current/main/phase170-d-fix-summary.md
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# Phase 170-D Bug Fix Verification - Summary Report
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**Date**: 2025-12-07
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**Status**: ✅ Bug Fix Verified and Documented
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**Files Updated**: 3 documentation files, 0 code changes (user implemented fix)
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---
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## 🎯 Executive Summary
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The **LoopConditionScopeBox function parameter misclassification bug** has been successfully verified. Function parameters are now correctly classified as **OuterLocal** instead of being incorrectly treated as **LoopBodyLocal**.
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**Key Result**: JsonParser loops now pass variable scope validation. Remaining errors are legitimate Pattern 5+ feature gaps (method calls), not bugs.
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---
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## 📊 Verification Results
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### ✅ Test 1: Function Parameter Classification
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**Test File**: `/tmp/test_jsonparser_simple.hako`
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**Loop**: Pattern 2 with function parameters `s` and `pos`
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**Result**:
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```
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✅ [joinir/pattern2] Phase 170-D: Condition variables verified: {"pos", "s", "len"}
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⚠️ New error: MethodCall .substring() not supported (Pattern 5+ feature)
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```
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**Analysis**:
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- ✅ **Bug fix works**: `s` and `pos` correctly classified as OuterLocal
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- ✅ **No more misclassification errors**: Variable scope validation passes
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- ⚠️ **Different blocker**: Method calls in loop body (legitimate feature gap)
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---
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### ✅ Test 2: LoopBodyLocal Correct Rejection
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**Test File**: `local_tests/test_trim_main_pattern.hako`
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**Loop**: Pattern 2 with LoopBodyLocal `ch` in break condition
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**Result**:
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```
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✅ [joinir/pattern2] Phase 170-D: Condition variables verified: {"ch", "end", "start"}
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❌ [ERROR] Variable 'ch' not bound in ConditionEnv
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```
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**Analysis**:
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- ✅ **Correct rejection**: `ch` is defined inside loop (`local ch = ...`)
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- ✅ **Accurate error message**: "Variable 'ch' not bound" (not misclassified)
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- ✅ **Expected behavior**: Pattern 2 doesn't support LoopBodyLocal in break conditions
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**Conclusion**: This is the **correct rejection** - not a bug, needs Pattern 5+ support.
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---
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### ✅ Test 3: JsonParser Full File
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**Test File**: `tools/hako_shared/json_parser.hako`
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**Result**:
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```
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❌ [ERROR] Unsupported expression in value context: MethodCall { ... }
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```
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**Analysis**:
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- ✅ **Variable classification working**: No "incorrect variable scope" errors
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- ⚠️ **New blocker**: Method calls in loop conditions (`s.length()`)
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- ✅ **Bug fix validated**: JsonParser now hits different limitations (not variable scope bugs)
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---
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## 📁 Documentation Created
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### 1. `/home/tomoaki/git/hakorune-selfhost/docs/development/current/main/phase170-d-fix-verification.md` ✅
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**Comprehensive verification report**:
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- Bug fix details (root cause + fix)
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- Test results before/after (3 test cases)
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- Pattern 1-4 coverage analysis
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- Verification commands
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- Impact assessment
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- Next steps (Pattern 5+ implementation)
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### 2. `CURRENT_TASK.md` Updated ✅
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**Added Section**: "Bug Fix: Function Parameter Misclassification"
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- Issue description
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- Root cause
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- Fix location (lines 175-184)
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- Impact summary
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- Link to verification doc
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### 3. `phase170-d-impl-design.md` Updated ✅
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**Added Section**: "Bug Fix: Function Parameter Misclassification (2025-12-07)"
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- Detailed root cause analysis
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- Before/after code comparison
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- Impact assessment
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- Test results
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- Lessons learned
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- Design principles
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---
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## 🔍 Bug Fix Technical Details
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**File**: `src/mir/loop_pattern_detection/condition_var_analyzer.rs`
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**Lines**: 175-184
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**The Fix** (user implemented):
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```rust
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// At this point:
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// - The variable is NOT in body_locals
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// - There is no explicit definition info for it
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//
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// This typically means "function parameter" or "outer local"
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// (e.g. JsonParserBox.s, .pos, etc.). Those should be treated
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// as OuterLocal for condition analysis, otherwise we wrongly
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// block valid loops as using loop-body-local variables.
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true // ✅ Default to OuterLocal for function parameters
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```
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**Key Insight**: Unknown variables (not in `variable_definitions`) are typically **function parameters** or **outer locals**, not loop-body-locals. The fix defaults them to the safer (OuterLocal) classification.
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---
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## 📈 Impact Assessment
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### What the Fix Achieves ✅
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1. ✅ **Function parameters work**: `s`, `pos` in JsonParser methods
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2. ✅ **Carrier variables work**: `start`, `end` in trim loops
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3. ✅ **Outer locals work**: `len`, `maxLen` from outer scope
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4. ✅ **Correct rejection**: LoopBodyLocal `ch` properly rejected (not a bug)
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### What Still Needs Work ⚠️
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**Pattern 5+ Features** (not bugs):
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- Method calls in conditions: `loop(pos < s.length())`
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- Method calls in loop body: `s.substring(pos, pos+1)`
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- LoopBodyLocal in break conditions: `if ch == " " { break }`
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**Other Issues** (orthogonal):
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- Exit Line / Boundary errors (separate architectural issues)
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---
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## 🚀 Next Steps
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### Priority 1: Pattern 5+ Implementation
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**Target loops**:
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- `_trim` loops (LoopBodyLocal `ch` in break condition)
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- `_parse_object`, `_parse_array` (method calls in loop body)
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**Estimated impact**: 10-15 additional loops in JsonParser
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### Priority 2: .hako Rewrite Strategy
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**Simplification approach**:
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- Hoist `.length()` calls to outer locals
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- Pre-compute `.substring()` results outside loop
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- Simplify break conditions to use simple comparisons
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**Trade-off**: Some loops may be easier to rewrite than to implement Pattern 5+
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### Priority 3: Coverage Metrics
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**Systematic observation needed**:
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```bash
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# Run coverage analysis on JsonParser
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./tools/analyze_joinir_coverage.sh tools/hako_shared/json_parser.hako
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```
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**Expected categories**:
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- Pattern 1: Simple loops (no break/continue)
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- Pattern 2: Loops with break (variable scope OK, method calls blocked)
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- Pattern 3: Loops with if-else PHI
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- Pattern 4: Loops with continue
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- Unsupported: Pattern 5+ needed (method calls, LoopBodyLocal conditions)
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---
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## ✅ Conclusion
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**Bug Fix Status**: ✅ Complete and Verified
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**Key Achievement**: Function parameters correctly classified as OuterLocal
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**Verification Outcome**: All tests demonstrate correct behavior:
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- Function parameters: ✅ Correctly classified
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- LoopBodyLocal: ✅ Correctly rejected
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- Error messages: ✅ Accurate (method calls, not variable scope)
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**Overall Impact**: Significant progress - variable scope classification is now correct. Remaining errors are **legitimate feature gaps** (Pattern 5+ needed), not misclassification bugs.
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**Build Status**: ✅ `cargo build --release` successful (0 errors, 50 warnings)
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---
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## 📋 Verification Commands Used
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```bash
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# Build verification
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cargo build --release
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# Test 1: Function parameter loop
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NYASH_JOINIR_DEBUG=1 NYASH_JOINIR_STRUCTURE_ONLY=1 \
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./target/release/hakorune /tmp/test_jsonparser_simple.hako 2>&1 | \
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grep -E "Phase 170-D|Error"
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# Test 2: TrimTest (LoopBodyLocal)
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NYASH_JOINIR_DEBUG=1 NYASH_JOINIR_STRUCTURE_ONLY=1 \
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./target/release/hakorune local_tests/test_trim_main_pattern.hako 2>&1 | \
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grep -E "Phase 170-D|Variable 'ch'"
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# Test 3: JsonParser full
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NYASH_JOINIR_STRUCTURE_ONLY=1 \
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./target/release/hakorune tools/hako_shared/json_parser.hako 2>&1 | \
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tail -40
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```
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---
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**End of Report**
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