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# 🔄 Context Restoration Guide for Baba Yaga Development
## 📋 **Quick Context Recovery**
### **Current Project State**
- **Location**: `/Users/eli/Code/tour/js/scripting-lang`
- **Goal**: Align C and JavaScript implementations using shared test suite
- **Progress**: 74% → **79%** compatibility (**MAJOR breakthrough this session!**)
### **Implementation Status**
| Implementation | Tests Passing | Status |
|----------------|---------------|---------|
| **JavaScript** | 28/34 (82%) | Reference implementation |
| **C** | **27/34 (79%)** | **Major breakthrough! Only 7 tests from goal!** |
## 🎯 **Immediate Context: Function Composition Logic**
### **Current High-Priority Issue**
**Problem**: C implementation returns function placeholders instead of executing compositions
**Failing Patterns**:
```bash
# What C returns now → What it should return
compose @double @square 3 → <function:partial> (should be 18)
pipe @double @square 2 → <function:partial> (should be 16)
apply @double 7 → Error (should be 14)
```
**Impact**: Fixing this will likely push C to 30+/34 tests (88%+)
## 📁 **Key Files to Know**
### **Test Infrastructure**
- `./tests/run_shared_tests.sh` - Unified test runner for both implementations
- `tests/unit/08_first_class_functions.txt` - Currently failing due to composition logic
### **C Implementation Core Files**
- `c/src/stdlib.c` - Standard library functions (needs composition logic fix)
- `c/src/interpreter.c` - Function registration and execution
- `c/include/baba_yaga.h` - Function declarations
### **JavaScript Reference**
- `js/lang.js` - Reference implementation for behavior comparison
## 🛠 **Essential Commands**
```bash
# Test current status
./tests/run_shared_tests.sh c
# Test specific failing area
c/bin/baba-yaga -f tests/unit/08_first_class_functions.txt
# Build C after changes
cd c && make && cd ..
# Compare implementations
./tests/run_shared_tests.sh c > c_results.txt
./tests/run_shared_tests.sh js > js_results.txt
```
## ✅ **Major Fixes Completed This Session**
1. **C Assertion Fix** - Now exits on false assertions like JavaScript
2. **C Logical Operators** - Now supports number-to-boolean coercion
3. **Pipe Function** - Implemented missing `pipe` function in C
4. **Function References** - Confirmed `@function` syntax works perfectly
## 📚 **Documentation Files**
- `SESSION_PROGRESS_DETAILED.md` - Comprehensive session progress
- `PROGRESS_UPDATE_2.md` - Executive summary
- `NEXT_STEPS.md` - Prioritized action plan
- `ALIGNMENT_PLAN.md` - Multi-phase alignment strategy
## 🎯 **Next Session Action Plan**
1. **Fix Function Composition Logic** (60-90 min)
- Modify `stdlib_compose`, `stdlib_pipe`, `stdlib_apply`
- Make them execute functions instead of returning placeholders
- Expected: Push C to 30+/34 tests
2. **Fix IO Operations** (45-60 min)
- Debug table pattern matching in `when` expressions
- Fix `tests/unit/05_io_operations.txt`
3. **Investigate Edge Cases** (30-45 min)
- Debug assertion failures in edge case test
- Clean up remaining compatibility issues
## 💡 **Key Insights to Remember**
- **Function references (`@function`) already work perfectly** - no parser issues
- **Most failures are semantic differences**, not architectural problems
- **C implementation is much closer to goal than initially appeared**
- **Type coercion and error handling differences are main remaining gaps**
## 🚀 **Session Momentum**
The project has **incredible momentum**! We've moved from architectural concerns to implementation refinements. The next session should achieve the **88%+ compatibility goal**.
---
**Bottom Line**: Read this file first, check `SESSION_PROGRESS_DETAILED.md` for specifics, then dive into function composition logic fix! 🎯
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