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fd83903f87
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feat(joinir): Phase P1 If Handler boxification - 40% code reduction
## Summary
Refactored loop-internal If statement handling into a boxified module
structure, achieving 154-line reduction (40%) from stmt_handlers.rs
with zero regression.
## Implementation
- Created if_in_loop/ module (9 files, ~480 lines)
- pattern.rs: IfInLoopPattern enum (5 variants)
- lowering/{empty,single_var_then,single_var_both,conditional_effect,unsupported}.rs
- Replaced lower_if_stmt_in_loop() (154 lines) with lower_if_stmt_in_loop_boxified()
- Made StatementEffect pub(crate) for module visibility
## Pattern Classification
1. Empty: condition-only check (no side effects)
2. SingleVarThen: if { x = a } → x = cond ? a : x
3. SingleVarBoth: if { x = a } else { x = b } → x = cond ? a : b
4. ConditionalEffect: if pred(v) { acc.push(v) } (filter pattern)
5. Unsupported: complex cases (Phase 54+)
## Test Results
✅ 56 JoinIR tests PASSED (0 failed, 0 regression)
✅ Build successful (1m 02s)
✅ Improved maintainability (easier to add new patterns)
## Files Changed
- src/mir/join_ir/frontend/ast_lowerer/
- if_in_loop/ (9 new files)
- mod.rs (+2 lines: module + pub use)
- stmt_handlers.rs (-154 lines: 40% reduction)
- CURRENT_TASK.md (+5 lines: Phase P1 記録)
- docs/development/refactoring/p1-if-handler-boxification-plan.md (new)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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2025-11-29 07:20:56 +09:00 |
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