# Ruchy Language Implementation TODO
## Generated with PMAT/PDMT Deterministic Task Management

> **Quality Gate**: All tasks must pass PMAT quality metrics before marking complete
> **Test Coverage**: Minimum 80% coverage with property, fuzz, and doctests
> **Validation**: Each task has `cargo run --example` verification

---

## 🎯 Current Sprint: MVP REPL Implementation (4 weeks)

### Week 1: Parser Foundation [PRIORITY: CRITICAL]
*Estimated: 40 hours | Complexity: Medium*

#### PARSE-MVP-001: Project Setup & Structure ✅
```bash
pmat init --project ruchy --quality-gate strict
cargo new ruchy --lib
cargo new ruchy-cli --bin
```
- [ ] Initialize Cargo workspace with sub-crates
- [ ] Configure PMAT quality gates in CI/CD
- [ ] Set up pre-commit hooks for quality validation
- [ ] Create examples/ directory structure
**Validation**: `pmat validate --project . && cargo build`

#### PARSE-MVP-002: Pest Grammar Definition 🚧
```pest
// src/grammar/ruchy_mvp.pest
identifier = @{ ASCII_ALPHA ~ (ASCII_ALPHANUMERIC | "_")* }
integer = @{ ASCII_DIGIT+ }
```
- [ ] Define core grammar rules (60% of full spec)
- [ ] Add operator precedence table
- [ ] Implement error recovery points
- [ ] Property test grammar with arbitrary inputs
**Validation**: `cargo test --package ruchy-parser grammar::tests`

#### PARSE-MVP-003: AST Implementation 🚧
```rust
#[derive(Debug, Clone, PartialEq)]
pub enum Expr {
    Literal(Literal),
    Binary(Box<Expr>, BinOp, Box<Expr>),
    // ...
}
```
- [ ] Define AST node types with span tracking
- [ ] Implement Display trait for pretty-printing
- [ ] Add serde derives for serialization
- [ ] Optimize enum sizes (≤48 bytes)
**Validation**: `cargo run --example ast_builder`

#### PARSE-MVP-004: Parser with Error Recovery 🚧
- [ ] Implement pest parser with PEG rules
- [ ] Add synchronization points for error recovery
- [ ] Create diagnostic messages with source positions
- [ ] Fuzz test with malformed inputs
**Validation**: `cargo run --example parser_demo`

---

### Week 2: Transpiler Core [PRIORITY: HIGH]
*Estimated: 50 hours | Complexity: High*

#### TRANS-MVP-001: AST to syn Transformation 📋
```rust
impl From<ruchy::Expr> for syn::Expr {
    fn from(expr: ruchy::Expr) -> Self {
        // Direct mapping
    }
}
```
- [ ] Map Ruchy AST nodes to syn equivalents
- [ ] Preserve source locations for debugging
- [ ] Handle all MVP language constructs
- [ ] Property test AST round-trips
**Validation**: `cargo run --example transpile_basic`

#### TRANS-MVP-002: Pipeline Operator Desugaring 📋
```rust
// a |> f |> g becomes g(f(a))
```
- [ ] Transform pipeline to method chains
- [ ] Maintain evaluation order
- [ ] Support custom pipeline operators
- [ ] Test with complex pipelines
**Validation**: `cargo run --example pipeline_transform`

#### TRANS-MVP-003: Optional Type Handling 📋
- [ ] Map `T?` to `Option<T>`
- [ ] Transform `?.` to `and_then` chains
- [ ] Generate proper unwrap handling
- [ ] Doctest all transformations
**Validation**: `cargo run --example optional_types`

---

### Week 3: REPL Implementation [PRIORITY: HIGH]
*Estimated: 45 hours | Complexity: Medium*

#### REPL-MVP-001: Context Management 📋
```rust
struct ReplContext {
    definitions: Vec<syn::Item>,
    bindings: HashMap<String, Type>,
    history: Vec<String>,
}
```
- [ ] Persistent binding storage
- [ ] Incremental compilation state
- [ ] Session serialization/restore
- [ ] Memory-efficient storage
**Validation**: `cargo run --example repl_session`

#### REPL-MVP-002: Rustyline Integration 📋
- [ ] Multi-line input detection
- [ ] Syntax highlighting via syntect
- [ ] Tab completion for identifiers
- [ ] History search (Ctrl+R)
**Validation**: `cargo run --example repl_interactive`

#### REPL-MVP-003: In-Memory Compilation 📋
```rust
// Compile and execute via rustc + dlopen
```
- [ ] Generate temporary Rust files
- [ ] Invoke rustc programmatically
- [ ] Load compiled library via libloading
- [ ] Capture stdout/stderr
**Validation**: `cargo run --example compile_execute`

#### REPL-MVP-004: Error Handling & Recovery 📋
- [ ] Parse error recovery with suggestions
- [ ] Type error display from rustc
- [ ] Runtime error catching
- [ ] Graceful panic handling
**Validation**: `cargo run --example error_handling`

---

### Week 4: Polish & Integration [PRIORITY: MEDIUM]
*Estimated: 35 hours | Complexity: Low*

#### INTEG-MVP-001: Cargo Integration 📋
```toml
[build-dependencies]
ruchy = "0.1.0"
```
- [ ] Build.rs code generation
- [ ] Source map generation
- [ ] Incremental compilation
- [ ] Parallel module compilation
**Validation**: `cargo run --example cargo_integration`

#### INTEG-MVP-002: Quality & Testing Suite 📋
- [ ] 50 parser unit tests
- [ ] 30 transpiler tests
- [ ] 20 REPL state tests
- [ ] 15 integration tests
- [ ] 10 property tests
- [ ] 5 fuzz targets
**Validation**: `pmat test-coverage --min 80`

#### INTEG-MVP-003: Examples & Documentation 📋
- [ ] fibonacci.ruchy example
- [ ] quicksort.ruchy example
- [ ] point_distance.ruchy example
- [ ] Complete API documentation
- [ ] User guide with tutorials
**Validation**: `cargo test --doc && cargo run --example all`

#### INTEG-MVP-004: Performance Optimization 📋
- [ ] Parser: achieve 100K LOC/sec
- [ ] Transpiler: achieve 50K LOC/sec
- [ ] REPL latency: <50ms
- [ ] Memory usage: <20MB
**Validation**: `cargo bench && pmat performance`

---

## 📊 Full Implementation Roadmap (After MVP)

### Phase 1: Type System [8 weeks]
- [ ] TYPE-001: Type representation with interning
- [ ] TYPE-002: Unification engine
- [ ] TYPE-003: Algorithm W implementation
- [ ] TYPE-004: Row polymorphism
- [ ] TYPE-005: Refinement types with Z3

### Phase 2: Advanced Code Generation [6 weeks]
- [ ] GEN-001: Complete AST transformation
- [ ] GEN-002: Memory management via escape analysis
- [ ] GEN-003: Peephole optimizations
- [ ] GEN-004: JIT via Cranelift

### Phase 3: Actor System [8 weeks]
- [ ] ACTOR-001: Lock-free mailbox design
- [ ] ACTOR-002: Supervision trees
- [ ] ACTOR-003: Selective receive
- [ ] ACTOR-004: Distributed registry with CRDTs

### Phase 4: MCP Integration [3 weeks]
- [ ] MCP-001: Tool definition generation
- [ ] MCP-002: Actor-to-MCP bridge
- [ ] MCP-003: Session type verification

### Phase 5: Developer Tools [4 weeks]
- [ ] TOOL-001: LSP implementation
- [ ] TOOL-002: Code formatter
- [ ] TOOL-003: VSCode extension
- [ ] TOOL-004: Debugger support

---

## 🔧 PMAT/PDMT Integration

### Quality Gates (Enforced on Every Commit)
```yaml
pmat_config:
  cyclomatic_complexity: 10
  cognitive_complexity: 15
  halstead_effort: 5000
  maintainability_index: 70
  test_coverage: 80
  mutation_score: 75
  satd_tolerance: 0
```

### Task Tracking Commands
```bash
# View current sprint tasks
pdmt list --sprint current

# Update task status
pdmt update PARSE-MVP-001 --status in_progress

# Generate quality report
pmat report --format html > docs/quality-report.html

# Validate before commit
pmat validate --fail-fast
```

### Continuous Monitoring
```bash
# Watch mode for development
pmat watch --on-save "cargo test && cargo clippy"

# Dashboard for metrics
pmat dashboard --port 8080
```

---

## 📈 Success Metrics

### MVP Success Criteria (Week 4)
- ✅ REPL executes 50-line programs
- ✅ Transpiled code compiles with rustc
- ✅ Performance within 10% of Rust
- ✅ Error messages with source positions
- ✅ 10 working examples

### Quality Metrics
- 📊 Code Coverage: 80% minimum
- 🧪 Property Tests: All public functions
- 🔬 Fuzz Tests: All parsers
- 📚 Doctests: All public APIs
- 🎯 Examples: All features demonstrated

### Performance Targets
- ⚡ Parser: 100K LOC/sec
- 🚀 Type Check: 50K LOC/sec
- 💫 Transpile: 200K LOC/sec
- ⏱️ REPL: <15ms latency
- 💾 Binary: <5MB size

---

## 🚨 Risk Mitigation

### Technical Risks
1. **Z3 Integration**: Use z3-sys with cached queries
2. **Cranelift Stability**: Pin version, add fallback
3. **CRDT Performance**: Implement δ-CRDT optimizations
4. **Type Inference Speed**: Level-based generalization

### Process Risks
1. **Scope Creep**: Strict MVP feature freeze
2. **Quality Debt**: PMAT gates block merges
3. **Testing Gaps**: Mandatory coverage checks
4. **Documentation**: Generated from doctests

---

## 📝 Notes

- All tasks have deterministic IDs for tracking
- PMAT validation runs on file save
- PDMT syncs with git commits
- Quality reports generated weekly
- Sprint reviews use automated metrics

---

*Generated with PMAT/PDMT | Last Updated: 2025-01-15*
*Next Sprint Planning: Week 4 Review*