# Changelog

All notable changes to the Nand2Tetris Zed Extension will be documented in this file.

The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).

## [2.0.0] - 2025-01-26

### Added
- **Complete Hack Assembly Language Support** (.asm files)
  - Full tree-sitter grammar with syntax highlighting
  - Support for A-instructions (`@value`, `@symbol`)
  - Support for C-instructions (`dest=comp;jump`)
  - Label declarations (`(LABEL)`)
  - All predefined symbols (`R0-R15`, `SP`, `LCL`, `ARG`, `THIS`, `THAT`, `SCREEN`, `KBD`)
  - User-defined symbols and variables
  - Comment highlighting and toggling
  - Code outline showing labels and sections

- **VM Language Support** (.vm files)
  - Complete tree-sitter grammar for VM commands
  - Stack arithmetic operations (`add`, `sub`, `neg`, `eq`, `gt`, `lt`, `and`, `or`, `not`)
  - Memory access commands (`push`, `pop`) with all memory segments
  - Program flow commands (`label`, `goto`, `if-goto`)
  - Function commands (`function`, `call`, `return`)
  - Memory segment highlighting (`argument`, `local`, `static`, `constant`, `this`, `that`, `pointer`, `temp`)
  - Function and label outline navigation

- **Test Script Language Support** (.tst files)
  - Tree-sitter grammar for nand2tetris test scripts
  - Test commands (`load`, `output-file`, `compare-to`, `set`, `eval`, `output`)
  - Simulation control (`tick`, `tock`, `ticktock`)
  - Control flow structures (`repeat`, `while`)
  - Variable references (`RAM[n]`, register names, pin names)
  - Binary value highlighting (`%B1010101`)
  - Format specification highlighting
  - Bracket matching for control blocks

- **Compare/Output File Support** (.cmp, .out files)
  - Tree-sitter grammar for tabular test result files
  - Header row highlighting with column names
  - Binary and decimal value highlighting
  - Register and pin reference recognition
  - Table structure visualization

- **Custom Tree-sitter Grammars**
  - Built from scratch for Assembly, VM, Test Script, and Compare/Output languages
  - Full Rust bindings for all custom grammars
  - Comprehensive test suites for each grammar
  - Complete Node.js package configurations

- **Enhanced Documentation**
  - Comprehensive README with examples for all languages
  - Development guide for contributors
  - Troubleshooting section with common issues
  - Grammar development guidelines

### Enhanced
- **Extended Language Coverage**
  - Now supports all major nand2tetris file types
  - Complete course workflow coverage from hardware to software
  - Consistent syntax highlighting across all languages

- **Improved Editor Integration**
  - Code outline support for all languages
  - Bracket matching where applicable
  - Smart indentation rules
  - Comment toggling support (`Cmd+/` or `Ctrl+/`)

- **Better Error Handling**
  - Robust grammar parsing with error recovery
  - Clear error messages for common issues
  - Comprehensive troubleshooting documentation

### Technical
- **Grammar Architecture**
  - Four new custom Tree-sitter grammars
  - Proper semantic token classification
  - Efficient parsing with minimal conflicts
  - Full compatibility with Zed's Tree-sitter integration

- **Build System**
  - Complete Rust build configuration for all grammars
  - Node.js bindings for development tools
  - Automated testing and validation
  - Cross-platform compatibility

## [1.1.0] - Previous Release

### Added
- HDL (Hardware Description Language) support
- Jack programming language support
- Basic syntax highlighting and bracket matching
- Code outline for HDL chips and Jack classes

### Technical
- Integration with external tree-sitter grammars
- Basic Zed extension configuration

## [1.0.0] - Initial Release

### Added
- Initial extension structure
- Basic HDL support
- Extension manifest and configuration

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## Development Notes

### Version 2.0.0 Represents a Major Milestone
This release transforms the extension from basic HDL/Jack support to comprehensive coverage of the entire nand2tetris ecosystem. The addition of four custom Tree-sitter grammars makes this the most complete nand2tetris editor integration available.

### Custom Grammar Development
The custom grammars were developed specifically for this extension to ensure:
- Accurate parsing of nand2tetris language specifications
- Optimal performance in the Zed editor
- Comprehensive syntax highlighting
- Proper semantic token classification
- Future extensibility and maintenance

### Breaking Changes
- Extension ID and configuration may have changed
- New file type associations require extension reinstallation
- Grammar compilation requires Rust toolchain

### Compatibility
- Requires Zed editor with Tree-sitter support
- Requires Rust installed via rustup for grammar compilation
- Compatible with all nand2tetris course materials
- Supports both individual files and complete project structures

### Performance
- All grammars optimized for fast parsing
- Minimal memory footprint
- Efficient syntax highlighting queries
- Responsive editor integration

## Future Roadmap

### Potential Future Enhancements
- Language server integration for advanced IDE features
- Code formatting support
- Integration with nand2tetris simulation tools
- Snippet support for common patterns
- Debugging integration
- Project template support

### Community Contributions
We welcome contributions for:
- Grammar improvements and bug fixes
- Additional language features
- Documentation enhancements
- Test case additions
- Performance optimizations

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For detailed technical information, see [DEVELOPMENT.md](DEVELOPMENT.md).
For usage instructions, see [README.md](README.md).