82 lines
3.5 KiB
Markdown
82 lines
3.5 KiB
Markdown
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# Phase 9.78e: Dynamic Method Dispatch Implementation Summary
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## 🎯 Overview
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Phase 9.78e aimed to implement dynamic method dispatch through the `call_method` trait method to unify method calling across all Box types.
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## ✅ Completed Tasks
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### 1. **NyashBox Trait Enhancement**
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- Added `call_method` to the NyashBox trait in `src/box_trait.rs`
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- Default implementation returns `MethodNotFound` error
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- Signature: `fn call_method(&mut self, method_name: &str, args: Vec<NyashValue>) -> Result<NyashValue, RuntimeError>`
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### 2. **StringBox Implementation**
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- Implemented `call_method` in `src/boxes/string_box.rs`
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- Supports all StringBox methods:
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- `type_name()`, `equals()`, `length()`
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- `concat()`, `split()`, `toUpperCase()`, `toLowerCase()`
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- `trim()`, `indexOf()`, `replace()`, `charAt()`, `substring()`
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- Includes argument validation and proper error handling
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### 3. **InstanceBox Implementation**
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- Implemented `call_method` in `src/instance_v2.rs` with delegation pattern:
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1. First checks user-defined methods
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2. Delegates to inner box for builtin methods
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3. Handles InstanceBox-specific methods (`getField`, `setField`, `hasMethod`)
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- Enables transparent method calls on wrapped builtin boxes
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### 4. **Error Type Updates**
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- Added new RuntimeError variants:
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- `MethodNotFound { method_name: String, type_name: String }`
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- `FieldNotFound { field_name: String, class_name: String }`
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### 5. **Interpreter Integration (Partial)**
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- Added call_method integration in `src/interpreter/expressions/calls.rs`
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- Implemented type conversion logic for Box<dyn NyashBox> to NyashValue
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- Added debug output for tracking method dispatch flow
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## 🚧 Challenges Encountered
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### 1. **Type Conversion Complexity**
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- Converting between `Box<dyn NyashBox>`, `Arc<Mutex<dyn NyashBox>>`, and `NyashValue`
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- Current workaround: Direct type-based conversion for basic types
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### 2. **Binary Compilation Issues**
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- Several unrelated compilation errors in the binary prevent full testing
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- Library builds successfully with call_method implementation
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### 3. **Architecture Considerations**
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- The current Box/NyashValue dual system creates friction
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- Future consideration: Unified value representation system
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## 📋 Test Results
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- Basic StringBox creation and string operations work correctly
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- Method calls currently fall back to legacy dispatch system
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- Call_method infrastructure is in place but needs full integration
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## 🔮 Next Steps
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### Immediate Tasks:
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1. Fix binary compilation errors to enable full testing
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2. Complete NyashValue/Box type conversion helpers
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3. Implement call_method for remaining builtin Box types
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### Long-term Improvements:
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1. Consider unified value representation to simplify type conversions
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2. Optimize method dispatch performance
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3. Add comprehensive test coverage for all Box types
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## 💡 Key Insights
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- The delegation pattern in InstanceBox successfully enables method calls on wrapped boxes
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- Dynamic dispatch through call_method provides a clean abstraction for method calling
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- Type conversion between the Box trait system and NyashValue remains a key challenge
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## 📝 Code Locations
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- Trait definition: `src/box_trait.rs:124-130`
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- StringBox impl: `src/boxes/string_box.rs:160-313`
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- InstanceBox impl: `src/instance_v2.rs:197-263`
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- Interpreter integration: `src/interpreter/expressions/calls.rs:230-288`
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---
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*Phase 9.78e establishes the foundation for unified method dispatch across all Nyash Box types, with the core infrastructure successfully implemented and ready for expanded integration.*
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