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feat(joinir): Phase 194 - Table-driven loop pattern router
Replace if/else chain with table-driven pattern dispatch for easier
pattern addition and maintenance.
# Changes
## New Files
- router.rs (137 lines): Pattern router table and dispatch logic
- LoopPatternContext: Context passed to detect/lower functions
- LoopPatternEntry: Pattern registration structure
- LOOP_PATTERNS: Static table with 3 registered patterns
- route_loop_pattern(): Single dispatch function
## Modified Files
- patterns/mod.rs (+8 lines): Export router module
- pattern1_minimal.rs (+19 lines): Added can_lower() + lower() wrapper
- pattern2_with_break.rs (+17 lines): Added can_lower() + lower() wrapper
- pattern3_with_if_phi.rs (+22 lines): Added can_lower() + lower() wrapper
- routing.rs (-21 lines): Replaced if/else chain with router call
# Architecture Improvement
## Before (if/else chain)
```rust
if func_name == "main" && has_sum {
return pattern3(...);
} else if func_name == "main" {
return pattern1(...);
} else if func_name == "JoinIrMin.main/0" {
return pattern2(...);
}
```
## After (table-driven)
```rust
let ctx = LoopPatternContext::new(...);
route_loop_pattern(self, &ctx)?
```
# Adding New Patterns (Now Trivial!)
1. Create pattern4_your_name.rs
2. Implement can_lower() + lower()
3. Add entry to LOOP_PATTERNS table
That's it! No routing logic changes needed.
# Testing
✅ Pattern 1 (loop_min_while.hako): PASSED
✅ Pattern 2 (joinir_min_loop.hako): PASSED
✅ Pattern 3 (loop_if_phi.hako): Routes correctly (VM error is pre-existing)
Router logging verified:
```
NYASH_TRACE_VARMAP=1 ./target/release/hakorune apps/tests/*.hako
[route] Pattern 'Pattern1_Minimal' matched for function 'main'
[route] Pattern 'Pattern2_WithBreak' matched for function 'JoinIrMin.main/0'
[route] Pattern 'Pattern3_WithIfPhi' matched for function 'main'
```
# Line Counts
- router.rs: 137 lines (new)
- Total pattern files: 491 lines (3 patterns)
- routing.rs: Reduced by 21 lines (-6%)
- Net addition: +137 lines (infrastructure investment)
# Documentation
See router.rs header for:
- Architecture overview
- How to add new patterns
- Priority ordering (Pattern3=30, Pattern1=10, Pattern2=20)
Phase 194 complete - pattern addition is now a trivial task!
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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2025-12-05 22:11:39 +09:00 |
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