Phase 1: Core Language Foundation¶
Status: Completed
Phase 1 implementation is complete.
Overview¶
- Objective: Implementation of jv language core foundation
- Key Deliverables: Basic syntax parser, AST/IR, basic Java output, CLI foundation
- Implementation Period: Sep 18, 2025 - Sep 30, 2025 (~2 weeks)
Key Features¶
1. Lexical & Syntax Analysis Implementation¶
1.1 Chumsky Parser Combinator Setup¶
- ✅ Added Chumsky library dependency
- ✅ Designed basic parser structure
- ✅ Set up parser test framework
- ✅ Implemented error handling mechanism
1.2 Basic Syntactic Sugar Parsing¶
- ✅ Parsing
val/vardeclarations - ✅ Parsing type inference annotations (
:) - ✅ Parsing null safety operators (
?.,?:) - ✅ Support for basic data types (String, Int, Boolean, etc.)
- ✅ Support for basic comment syntax (
//,/* */)
1.2.1 JSONC Native Support¶
- ✅ Implemented parsing of JSON with comments (JSONC)
- ✅ Support for
//line comments in JSON literals - ✅ Support for
/* */block comments in JSON literals - ✅ Type inference system from JSON literals
- ✅ AST representation design for JSON literals
1.2.2 Multi-line String Blocks¶
- ✅ Parsing multi-line strings without DSL specification (
```) - ✅ Parsing multi-line strings (
""") - ✅ Support for string interpolation in multi-line strings (
${variable}) - ✅ Indent normalization and trimming functionality
- ✅ Escape sequence processing
2. AST/IR Design¶
2.1 Abstract Syntax Tree (AST) Definition¶
- ✅ Design of node base types
- ✅ Definition of Expression node hierarchy
- ✅ Definition of Statement node hierarchy
- ✅ Design of type annotation representation
- ✅ Embedding position information (source location)
2.2 Intermediate Representation (IR) Design¶
- ✅ AST to IR conversion interface
- ✅ Desugaring (syntactic sugar expansion) design
- ✅ Symbol table management mechanism
- ✅ Scope management system
- ✅ Type information attachment structure
3. Basic Java Code Generation¶
3.1 Java 25 Code Generator¶
- ✅ Implementation of Java 25 syntax generation engine
- ✅ Record class generation functionality
- ✅ Sealed class/interface generation functionality
- ✅ Pattern matching (switch expression) generation functionality
- ✅ Virtual Thread integration
3.2 Java 21 Compatible Output¶
- ✅ Implementation of Java 21 fallback functionality
- ✅ Feature limitation warning system
- ✅ Creation of compatibility matrix
- ✅ Version-specific optimization
4. CLI Foundation¶
4.1 jv build Command Implementation¶
- ✅ Command-line argument parsing (using clap)
- ✅ Input file search and loading
- ✅ Parsing → AST → IR → Java conversion pipeline
- ✅ Output file writing functionality
- ✅ Error reporting functionality
4.2 jv run Command Implementation¶
- ✅ Java file compilation execution
- ✅ Main class auto-detection
- ✅ Argument passing functionality
- ✅ Runtime error handling
Test & Quality Assurance¶
Unit Tests¶
- ✅ Parser functionality test suite
- ✅ AST/IR conversion test cases
- ✅ Java code generation test cases
- ✅ CLI command integration tests
Integration Tests¶
- ✅ End-to-end (.jv → .java → .class) tests
- ✅ Error case test coverage
- ✅ Performance tests (small files)
- ✅ Cross-platform tests
Completion Criteria¶
Functional Completion¶
- ✅ Basic .jv file transpilation to Java 25 code works
- ✅
jv buildgenerates Java code without compilation errors - ✅
jv runexecutes generated Java code successfully - ✅ Output switching for both Java 21/25 targets works
Quality Standards¶
- ✅ Unit test coverage >80%
- ✅ All integration tests pass
- ✅ Appropriate memory usage (under 100MB for small files)
- ✅ Appropriate compilation time (under 3 seconds for <1000 lines)
Roadmap Documentation
This document is based on the development checklist.