# Lua DSL Implementation Status

## ✅ COMPLETED: Python ANTLR Parser

The Python ANTLR parser is **fully implemented and tested**.

### What Works

1. **ANTLR Grammar**
   - Downloaded Lua 5.4 grammar from antlr/grammars-v4
   - Split grammar: `LuaLexer.g4` and `LuaParser.g4`
   - Base classes: `LuaLexerBase.py` and `LuaParserBase.py`

2. **Parser Generation**
   - Generated using Docker with `eclipse-temurin:17-jre`
   - Fixed `this` → `self` references (ANTLR Python target bug)
   - Parsers committed to repo

3. **Semantic Visitor** (`semantic_visitor.py`)
   - Walks ANTLR parse tree
   - Extracts all DSL declarations
   - Builds ProcedureRegistry without code execution
   - Handles all DSL functions

4. **Validator** (`validator.py`)
   - Three-phase validation: syntax → semantic → registry
   - Quick mode (syntax only) and full mode (complete validation)
   - Clear error messages with line/column locations

5. **Testing**
   - 12 comprehensive tests
   - All tests passing
   - Tests cover:
     - Valid/invalid Lua syntax
     - Error location reporting
     - DSL function recognition
     - Parameter/output/agent extraction
     - All 5 example files
     - Missing required fields
     - Quick vs full validation modes

### Test Results

```
tests/validation/test_antlr_parser.py::TestANTLRParser::test_valid_lua_syntax PASSED
tests/validation/test_antlr_parser.py::TestANTLRParser::test_invalid_lua_syntax PASSED
tests/validation/test_antlr_parser.py::TestANTLRParser::test_syntax_error_location PASSED
tests/validation/test_antlr_parser.py::TestANTLRParser::test_dsl_function_recognition PASSED
tests/validation/test_antlr_parser.py::TestANTLRParser::test_parameter_extraction PASSED
tests/validation/test_antlr_parser.py::TestANTLRParser::test_output_extraction PASSED
tests/validation/test_antlr_parser.py::TestANTLRParser::test_agent_extraction PASSED
tests/validation/test_antlr_parser.py::TestANTLRParser::test_all_examples PASSED
tests/validation/test_antlr_parser.py::TestANTLRParser::test_missing_required_fields PASSED
tests/validation/test_antlr_parser.py::TestANTLRParser::test_missing_procedure PASSED
tests/validation/test_antlr_parser.py::TestANTLRParser::test_agent_missing_provider PASSED
tests/validation/test_antlr_parser.py::TestANTLRParser::test_quick_vs_full_mode PASSED

======================== 12 passed, 8 warnings in 0.33s ========================
```

### CLI Integration

The CLI now uses ANTLR validation:

```bash
$ tactus validate examples/hello-world.tac

✓ DSL is valid

Workflow Info
┏━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
┃ Property    ┃ Value                                     ┃
┡━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┩
│ Name        │ hello_world                               │
│ Version     │ 1.0.0                                     │
│ Class       │ LuaDSL                                    │
│ Description │ A simple "Hello World" example for Tactus │
└─────────────┴───────────────────────────────────────────┘
```

## ⚠️ IN PROGRESS: TypeScript ANTLR Parser

The TypeScript parser has been **partially implemented** but has compilation issues.

### What's Done

1. **Project Setup**
   - TypeScript project created in `tactus-web/`
   - Dependencies installed: `antlr4ts`, `antlr4ts-cli`
   - Jest test framework configured

2. **Parser Generation**
   - Generated using Docker with antlr4ts
   - Base classes copied from grammars-v4 repo
   - Files created in `tactus-web/src/validation/generated/`

3. **Implementation Files Created**
   - `TactusDSLVisitor.ts` - Semantic visitor (mirrors Python)
   - `TactusValidator.ts` - Main validator
   - `TactusErrorListener.ts` - Error collection
   - `registry.ts` - Registry builder (mirrors Python)
   - `types.ts` - Type definitions
   - Tests written in `tests/validation/TactusValidator.test.ts`

### Known Issues

The antlr4ts code generator has bugs:
- Generates code with TypeScript compilation errors
- Base class imports use wrong module names
- Some API methods don't match antlr4ts runtime
- Requires manual fixes to generated code

### Next Steps for TypeScript

1. Fix base class imports in generated code
2. Fix visitor implementation (extends vs implements)
3. Add null checks for optional properties
4. Fix parser API calls (removeErrorListeners, addErrorListener)
5. Run tests and iterate until passing

## Docker Requirement

**IMPORTANT**: Parser generation requires Docker.

### Why Docker?

- ANTLR4 requires Java Runtime
- Docker avoids requiring Java installation on developer machines
- Provides reproducible build environment
- Image: `eclipse-temurin:17-jre`

### When Docker is Needed

- **Parser generation** (modifying grammar files)
- **NOT needed** for:
  - Normal development
  - Running Tactus
  - Using validators
  - End users

### Commands

```bash
# Generate both parsers
make generate-parsers

# Generate Python parser only
make generate-python-parser

# Generate TypeScript parser only  
make generate-typescript-parser
```

## Architecture Summary

```
.tac file
      |
      ├─→ ANTLR Parser (validation, no execution)
      |        ↓
      |   Parse Tree
      |        ↓
      |   Semantic Visitor
      |        ↓
      |   ProcedureRegistry
      |        ↓
      |   ValidationResult
      |
      └─→ Lupa Runtime (execution with primitives)
               ↓
          Procedure execution
```

**Key Insight:** Same source file, two different uses:
- **ANTLR**: Validates structure without execution
- **Lupa**: Executes procedure with injected primitives

## File Structure

```
tactus/
├── validation/
│   ├── grammar/
│   │   ├── LuaLexer.g4           # Lua lexer grammar
│   │   └── LuaParser.g4          # Lua parser grammar
│   ├── generated/                # Generated Python parser
│   │   ├── LuaLexer.py
│   │   ├── LuaParser.py
│   │   ├── LuaParserVisitor.py
│   │   ├── LuaLexerBase.py
│   │   └── LuaParserBase.py
│   ├── semantic_visitor.py       # DSL pattern recognition
│   ├── error_listener.py         # Error collection
│   └── validator.py              # Main validator

tactus-web/
├── src/validation/
│   ├── generated/                # Generated TypeScript parser
│   │   ├── LuaLexer.ts
│   │   ├── LuaParser.ts
│   │   ├── LuaParserVisitor.ts
│   │   ├── LuaLexerBase.ts
│   │   └── LuaParserBase.ts
│   ├── TactusDSLVisitor.ts       # DSL pattern recognition
│   ├── TactusErrorListener.ts    # Error collection
│   ├── TactusValidator.ts        # Main validator
│   ├── registry.ts               # Registry builder
│   └── types.ts                  # Type definitions
```

## Success Metrics

### Python Parser ✅
- [x] Grammar downloaded and verified
- [x] Parser generated successfully
- [x] Semantic visitor implemented
- [x] All 12 tests passing
- [x] Validates all 5 example files
- [x] CLI integration working
- [x] Documentation complete

### TypeScript Parser ⚠️
- [x] Grammar same as Python (shared)
- [x] Parser generated
- [x] Semantic visitor implemented
- [x] Registry builder ported
- [x] Tests written
- [ ] Compilation issues resolved
- [ ] Tests passing
- [ ] Parity with Python parser

## Conclusion

The Python ANTLR parser is **production-ready** and provides:
- Formal grammar-based validation
- No code execution during validation
- Foundation for IDE features
- Comprehensive test coverage

The TypeScript parser is **in progress** and requires additional work to resolve antlr4ts compatibility issues.









