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MGen: Multi-Language Code Generator\n\nMGen is a sophisticated Python-to-multiple-languages code generator that translates Python code to C, C++, Rust, Go, Haskell, and OCaml while preserving semantics and performance characteristics.\n\n## Overview\n\nMGen extends the CGen (Python-to-C) project into a comprehensive multi-language translation system with enhanced runtime libraries, sophisticated code generation, and a clean backend architecture.\n\n## Key Features\n\n- **Multi-Language Support**: Generate code for C, C++, Rust, Go, Haskell, and OCaml with comprehensive language features\n- **Universal Preference System**: Customize code generation for each backend with language-specific preferences\n- **Advanced Python Support**: Object-oriented programming, comprehensions, string methods, augmented assignment\n- **Modern Libraries**: C++ STL, Rust standard library, Go standard library, Haskell containers, OCaml standard library\n- **Clean Architecture**: Extensible backend system with abstract interfaces for adding new target languages\n- **Type-Safe Generation**: Leverages Python type annotations for accurate and safe code translation\n- **Runtime Libraries**: Enhanced C backend with 50KB+ runtime libraries providing Python-like semantics\n- **CLI Interface**: Simple command-line tool with preference customization for conversion and building\n- **Production-Ready**: 821 passing tests ensuring translation accuracy and code quality\n\n## Supported Languages\n\n| Language | Status      | Extension | Build System      | Advanced Features | Preferences |\n|----------|-------------|-----------|-------------------|-------------------|-------------|\n| C        | Enhanced    | `.c`      | Makefile / gcc    | OOP, STC containers, string methods, comprehensions, runtime libraries | 12 settings |\n| C++      | Enhanced    | `.cpp`    | Makefile / g++    | OOP, STL containers, string methods, comprehensions | 15 settings |\n| Rust     | Enhanced    | `.rs`     | Cargo / rustc     | OOP, standard library, string methods, comprehensions, memory safety | 19 settings |\n| Go       | Enhanced    | `.go`     | go.mod / go build | OOP, standard library, string methods, comprehensions | 18 settings |\n| Haskell  | Enhanced    | `.hs`     | Cabal / ghc       | Functional programming, comprehensions, type safety | 12 settings |\n| OCaml    | Enhanced    | `.ml`     | dune / ocamlc     | Functional programming, pattern matching, comprehensions | 17 settings |\n\n## Quick Start\n\n### Installation\n\n```bash\n# Install from source\ngit clone https://github.com/shakfu/mgen\ncd mgen\npip install -e .\n```\n\n### Basic Usage\n\n```bash\n# List available backends\nmgen backends\n\n# Convert Python to C (with advanced features)\nmgen --target c convert my_script.py\n\n# Convert Python to C++ (with STL support)\nmgen --target cpp convert my_script.py\n\n# Convert Python to Rust with build\nmgen --target rust build my_script.py\n\n# Convert Python to Go (with enhanced features)\nmgen --target go convert my_script.py\n\n# Convert Python to Haskell (with functional programming features)\nmgen --target haskell convert my_script.py\n\n# Convert Python to OCaml (with functional programming and pattern matching)\nmgen --target ocaml convert my_script.py\n\n# Batch convert all Python files\nmgen --target cpp batch --source-dir ./examples\n```\n\n### Backend Preferences\n\nCustomize code generation for each target language with the `--prefer` flag:\n\n```bash\n# Haskell with native comprehensions (idiomatic)\nmgen --target haskell convert my_script.py --prefer use_native_comprehensions=true\n\n# C with custom settings\nmgen --target c convert my_script.py --prefer use_stc_containers=false --prefer indent_size=2\n\n# C++ with modern features\nmgen --target cpp convert my_script.py --prefer cpp_standard=c++20 --prefer use_modern_cpp=true\n\n# Rust with specific edition\nmgen --target rust convert my_script.py --prefer rust_edition=2018 --prefer clone_strategy=explicit\n\n# Go with version targeting\nmgen --target go convert my_script.py --prefer go_version=1.19 --prefer use_generics=false\n\n# OCaml with functional programming preferences\nmgen --target ocaml convert my_script.py --prefer prefer_immutable=true --prefer use_pattern_matching=true\n\n# Multiple preferences\nmgen --target haskell build my_script.py \\\n  --prefer use_native_comprehensions=true \\\n  --prefer camel_case_conversion=false \\\n  --prefer strict_data_types=true\n```\n\n## Preference System\n\nMGen features a comprehensive preference system that allows you to choose between **cross-language consistency** (default) and **language-specific idiomatic optimizations**.\n\n### Design Philosophy\n\n- **Default (Consistent)**: Uses runtime library functions for predictable behavior across all languages\n- **Idiomatic (Optimized)**: Uses native language features for better performance and familiarity\n\n### Available Preference Categories\n\n| Backend | Key Preferences | Description |\n|---------|-----------------|-------------|\n| **Haskell** | `use_native_comprehensions`, `camel_case_conversion`, `strict_data_types` | Native vs runtime comprehensions, naming, type system |\n| **C** | `use_stc_containers`, `brace_style`, `indent_size` | Container choice, code style, memory management |\n| **C++** | `cpp_standard`, `use_modern_cpp`, `use_stl_containers` | Language standard, modern features, STL usage |\n| **Rust** | `rust_edition`, `clone_strategy`, `use_iterators` | Edition targeting, ownership patterns, functional style |\n| **Go** | `go_version`, `use_generics`, `naming_convention` | Version compatibility, language features, Go idioms |\n| **OCaml** | `prefer_immutable`, `use_pattern_matching`, `curried_functions` | Functional style, pattern matching, function curry style |\n\n### Example: Haskell Comprehensions\n\n**Python Source:**\n\n```python\ndef filter_numbers(numbers):\n    return [x * 2 for x in numbers if x \u003e 5]\n```\n\n**Default (Runtime Consistency):**\n\n```haskell\nfilterNumbers numbers = listComprehensionWithFilter numbers (\\x -\u003e x \u003e 5) (\\x -\u003e x * 2)\n```\n\n**Native (Idiomatic Haskell):**\n\n```haskell\nfilterNumbers numbers = [x * 2 | x \u003c- numbers, x \u003e 5]\n```\n\n### Example: OCaml Functional Programming\n\n**Python Source:**\n\n```python\ndef process_items(items):\n    return [item.upper() for item in items if len(item) \u003e 3]\n```\n\n**Default (Runtime Consistency):**\n\n```ocaml\nlet process_items items =\n  list_comprehension_with_filter items (fun item -\u003e len item \u003e 3) (fun item -\u003e upper item)\n```\n\n**Functional (Idiomatic OCaml):**\n\n```ocaml\nlet process_items items =\n  List.filter (fun item -\u003e String.length item \u003e 3) items\n  |\u003e List.map String.uppercase_ascii\n```\n\nFor complete preference documentation, see [PREFERENCES.md](PREFERENCES.md).\n\n## Examples\n\n### Simple Functions\n\n**Python Input:**\n\n```python\ndef add(x: int, y: int) -\u003e int:\n    return x + y\n\ndef main() -\u003e None:\n    result = add(5, 3)\n    print(result)\n```\n\n**Generated C++:**\n\n```cpp\n#include \u003ciostream\u003e\n#include \u003cvector\u003e\n#include \u003cunordered_map\u003e\n#include \"runtime/mgen_cpp_runtime.hpp\"\n\nusing namespace std;\nusing namespace mgen;\n\nint add(int x, int y) {\n    return (x + y);\n}\n\nvoid main() {\n    int result = add(5, 3);\n    cout \u003c\u003c result \u003c\u003c endl;\n}\n```\n\n**Generated C:**\n\n```c\n#include \u003cstdio.h\u003e\n#include \"mgen_runtime.h\"\n\nint add(int x, int y) {\n    return (x + y);\n}\n\nvoid main() {\n    int result = add(5, 3);\n    printf(\"%d\\n\", result);\n}\n```\n\n**Generated Go:**\n\n```go\npackage main\n\nimport \"mgen\"\n\nfunc add(x int, y int) int {\n    return (x + y)\n}\n\nfunc main() {\n    result := add(5, 3)\n    mgen.Print(result)\n}\n```\n\n**Generated Rust:**\n\n```rust\n// Include MGen Rust runtime\nmod mgen_rust_runtime;\nuse mgen_rust_runtime::*;\n\nfn add(x: i32, y: i32) -\u003e i32 {\n    (x + y)\n}\n\nfn main() {\n    let mut result = add(5, 3);\n    print_value(result);\n}\n```\n\n**Generated Haskell:**\n\n```haskell\nmodule Main where\n\nimport MGenRuntime\nimport qualified Data.Map as Map\nimport qualified Data.Set as Set\nimport Data.Map (Map)\nimport Data.Set (Set)\n\nadd :: Int -\u003e Int -\u003e Int\nadd x y = (x + y)\n\nmain :: IO ()\nmain = printValue (add 5 3)\n```\n\n**Generated OCaml:**\n\n```ocaml\n(* Generated OCaml code from Python *)\n\nopen Mgen_runtime\n\nlet add x y =\n  (x + y)\n\nlet main () =\n  let result = add 5 3 in\n  print_value result\n\nlet () = print_value \"Generated OCaml code executed successfully\"\n```\n\n### Advanced Features (Object-Oriented Programming)\n\n**Python Input:**\n\n```python\nclass Calculator:\n    def __init__(self, name: str):\n        self.name: str = name\n        self.total: int = 0\n\n    def add(self, value: int) -\u003e None:\n        self.total += value\n\n    def get_result(self) -\u003e str:\n        return self.name.upper() + \": \" + str(self.total)\n\ndef process() -\u003e list:\n    calc = Calculator(\"math\")\n    calc.add(10)\n    return [calc.get_result() for _ in range(2)]\n```\n\n**Generated C++:**\n\n```cpp\n#include \u003ciostream\u003e\n#include \u003cstring\u003e\n#include \u003cvector\u003e\n#include \"runtime/mgen_cpp_runtime.hpp\"\n\nusing namespace std;\nusing namespace mgen;\n\nclass Calculator {\npublic:\n    std::string name;\n    int total;\n\n    Calculator(std::string name) {\n        this-\u003ename = name;\n        this-\u003etotal = 0;\n    }\n\n    void add(int value) {\n        this-\u003etotal += value;\n    }\n\n    std::string get_result() {\n        return (StringOps::upper(this-\u003ename) + (\": \" + to_string(this-\u003etotal)));\n    }\n};\n\nstd::vector\u003cstd::string\u003e process() {\n    Calculator calc(\"math\");\n    calc.add(10);\n    return list_comprehension(Range(2), [\u0026](auto _) {\n        return calc.get_result();\n    });\n}\n```\n\n**Generated Go:**\n\n```go\npackage main\n\nimport \"mgen\"\n\ntype Calculator struct {\n    Name string\n    Total int\n}\n\nfunc NewCalculator(name string) Calculator {\n    obj := Calculator{}\n    obj.Name = name\n    obj.Total = 0\n    return obj\n}\n\nfunc (obj *Calculator) Add(value int) {\n    obj.Total += value\n}\n\nfunc (obj *Calculator) GetResult() string {\n    return (mgen.StrOps.Upper(obj.Name) + (\": \" + mgen.ToStr(obj.Total)))\n}\n\nfunc process() []interface{} {\n    calc := NewCalculator(\"math\")\n    calc.Add(10)\n    return mgen.Comprehensions.ListComprehension(mgen.NewRange(2), func(item interface{}) interface{} {\n        _ := item.(int)\n        return calc.GetResult()\n    })\n}\n```\n\n**Generated Rust:**\n\n```rust\nuse std::collections::{HashMap, HashSet};\n\n// Include MGen Rust runtime\nmod mgen_rust_runtime;\nuse mgen_rust_runtime::*;\n\n#[derive(Clone)]\nstruct Calculator {\n    name: String,\n    total: i32,\n}\n\nimpl Calculator {\n    fn new(name: String) -\u003e Self {\n        Calculator {\n            name: name,\n            total: 0,\n        }\n    }\n\n    fn add(\u0026mut self, value: i32) {\n        self.total += value;\n    }\n\n    fn get_result(\u0026mut self) -\u003e String {\n        ((StrOps::upper(\u0026self.name) + \": \".to_string()) + to_string(self.total))\n    }\n}\n\nfn process() -\u003e Vec\u003cString\u003e {\n    let mut calc = Calculator::new(\"math\".to_string());\n    calc.add(10);\n    Comprehensions::list_comprehension(new_range(2).collect(), |_| calc.get_result())\n}\n```\n\n**Generated Haskell:**\n\n```haskell\n{-# LANGUAGE OverloadedStrings #-}\n{-# LANGUAGE FlexibleInstances #-}\n\nmodule Main where\n\nimport MGenRuntime\nimport qualified Data.Map as Map\nimport qualified Data.Set as Set\nimport Data.Map (Map)\nimport Data.Set (Set)\n\ndata Calculator = Calculator\n  { name :: String\n  , total :: Int\n  } deriving (Show, Eq)\n\nnewCalculator :: String -\u003e Calculator\nnewCalculator name = Calculator { name = name, total = 0 }\n\nadd :: Calculator -\u003e Int -\u003e ()\nadd obj value = ()  -- Haskell immutable approach\n\ngetResult :: Calculator -\u003e String\ngetResult obj = (upper (name obj)) + \": \" + (toString (total obj))\n\nprocess :: [String]\nprocess =\n  let calc = newCalculator \"math\"\n  in listComprehension (rangeList (range 2)) (\\_ -\u003e getResult calc)\n```\n\n**Generated OCaml:**\n\n```ocaml\n(* Generated OCaml code from Python *)\n\nopen Mgen_runtime\n\ntype calculator = {\n  name : string;\n  total : int;\n}\n\nlet create_calculator name =\n  {\n    name = name;\n    total = 0;\n  }\n\nlet calculator_add (calculator_obj : calculator) value =\n  (* Functional update creating new record *)\n  { calculator_obj with total = calculator_obj.total + value }\n\nlet calculator_get_result (calculator_obj : calculator) =\n  (calculator_obj.name ^ \": \" ^ string_of_int calculator_obj.total)\n\nlet process () =\n  let calc = create_calculator \"math\" in\n  let updated_calc = calculator_add calc 10 in\n  list_comprehension (range_list (range 2)) (fun _ -\u003e calculator_get_result updated_calc)\n```\n\n## Architecture\n\nMGen follows a clean, extensible architecture with well-defined components:\n\n### 7-Phase Translation Pipeline\n\n1. **Validation**: Verify Python source compatibility\n2. **Analysis**: Analyze code structure and dependencies\n3. **Python Optimization**: Apply Python-level optimizations\n4. **Mapping**: Map Python constructs to target language equivalents\n5. **Target Optimization**: Apply target language-specific optimizations\n6. **Generation**: Generate target language code\n7. **Build**: Compile/build using target language toolchain\n\n### Frontend (Language-Agnostic)\n\n- **Type Inference**: Analyzes Python type annotations and infers types\n- **Static Analysis**: Validates code compatibility and detects unsupported features\n- **AST Processing**: Parses and transforms Python abstract syntax tree\n\n### Backends (Language-Specific)\n\nEach backend implements abstract interfaces:\n\n- **AbstractEmitter**: Code generation for target language\n- **AbstractFactory**: Factory for backend components\n- **AbstractBuilder**: Build system integration\n- **AbstractContainerSystem**: Container and collection handling\n\n### Runtime Libraries (C Backend)\n\n- **Error Handling** (`mgen_error_handling.h/.c`): Python-like exception system\n- **Memory Management** (`mgen_memory_ops.h/.c`): Safe allocation and cleanup\n- **Python Operations** (`mgen_python_ops.h/.c`): Python built-ins and semantics\n- **String Operations** (`mgen_string_ops.h/.c`): String methods with memory safety\n- **STC Integration** (`mgen_stc_bridge.h/.c`): Smart Template Container bridge\n\n## CLI Commands\n\n### Convert\n\nConvert Python files to target language:\n\n```bash\nmgen --target \u003clanguage\u003e convert \u003cinput.py\u003e\nmgen --target rust convert example.py\n```\n\n### Build\n\nConvert and compile/build the result:\n\n```bash\nmgen --target \u003clanguage\u003e build \u003cinput.py\u003e\nmgen --target go build --makefile example.py  # Generate build file\nmgen --target c build example.py              # Direct compilation\n```\n\n### Batch\n\nProcess multiple files:\n\n```bash\nmgen --target \u003clanguage\u003e batch --source-dir \u003cdir\u003e\nmgen --target rust batch --source-dir ./src --build\n```\n\n### Backends\n\nList available language backends:\n\n```bash\nmgen backends\n```\n\n### Clean\n\nClean build artifacts:\n\n```bash\nmgen clean\n```\n\n## Development\n\n### Running Tests\n\n```bash\nmake test           # Run all 821 tests\nmake lint           # Run code linting with ruff\nmake type-check     # Run type checking with mypy\n```\n\n### Test Organization\n\nMGen maintains a comprehensive test suite organized into focused modules:\n\n- `test_backend_c_*.py`: C backend tests (191 tests total)\n  - Core functionality, OOP, comprehensions, string methods, runtime libraries\n- `test_backend_cpp_*.py`: C++ backend tests (104 tests)\n  - STL integration, modern C++ features, OOP support\n- `test_backend_rust_*.py`: Rust backend tests (176 tests)\n  - Ownership patterns, memory safety, standard library\n- `test_backend_go_*.py`: Go backend tests (95 tests)\n  - Go idioms, standard library, concurrency patterns\n- `test_backend_haskell_*.py`: Haskell backend tests (93 tests)\n  - Functional programming, type safety, comprehensions\n- `test_backend_ocaml_*.py`: OCaml backend tests (25 tests)\n  - Functional programming, pattern matching, immutability\n\n### Adding New Backends\n\nTo add support for a new target language:\n\n1. Create backend directory: `src/mgen/backends/mylang/`\n2. Implement required abstract interfaces:\n   - `MyLangBackend(LanguageBackend)`: Main backend class\n   - `MyLangFactory(AbstractFactory)`: Component factory\n   - `MyLangEmitter(AbstractEmitter)`: Code generation\n   - `MyLangBuilder(AbstractBuilder)`: Build system integration\n   - `MyLangContainerSystem(AbstractContainerSystem)`: Container handling\n   - `MyLangPreferences(BasePreferences)`: Language-specific preferences\n3. Register backend in `src/mgen/backends/registry.py`\n4. Add comprehensive tests in `tests/test_backend_mylang_*.py`\n5. Update documentation\n\nSee existing backends (C, C++, Rust, Go, Haskell, OCaml) for implementation examples.\n\n## Relationship with CGen\n\nMGen extends the [CGen](https://github.com/shakfu/cgen) project by:\n\n- Expanding Python-to-C capabilities into a multi-language translation system\n- Integrating CGen's sophisticated C runtime libraries (50KB+ of error handling, memory management, Python operations)\n- Incorporating the STC (Smart Template Container) library for high-performance C containers\n- Adding support for C++, Rust, Go, Haskell, and OCaml target languages\n- Implementing a clean 7-phase translation pipeline with abstract backend interfaces\n- Providing a universal preference system for language-specific code generation customization\n\n## Contributing\n\n1. Fork the repository\n2. Create a feature branch\n3. Add tests for new functionality\n4. Ensure all tests pass\n5. Submit a pull request\n\n## License\n\nMIT License - see LICENSE file for details.\n\n## Advanced Features\n\n### Supported Python Features\n\nAll backends support core Python features with varying levels of sophistication:\n\n- **Object-Oriented Programming**: Classes, methods, constructors, instance variables, method calls\n- **Augmented Assignment**: All operators (`+=`, `-=`, `*=`, `/=`, `//=`, `%=`, `|=`, `^=`, `\u0026=`, `\u003c\u003c=`, `\u003e\u003e=`)\n- **String Operations**: `upper()`, `lower()`, `strip()`, `find()`, `replace()`, `split()`\n- **Comprehensions**: List, dict, and set comprehensions with range iteration and conditional filtering\n- **Control Structures**: if/elif/else, while loops, for loops with range()\n- **Built-in Functions**: `abs()`, `bool()`, `len()`, `min()`, `max()`, `sum()`\n- **Type Inference**: Automatic type detection from annotations and assignments\n\n### Container Support by Language\n\n- **C**: STC (Smart Template Container) library with optimized C containers (864KB integrated library)\n- **C++**: STL containers (`std::vector`, `std::unordered_map`, `std::unordered_set`)\n- **Rust**: Standard library collections (`Vec`, `HashMap`, `HashSet`) with memory safety\n- **Go**: Standard library containers with idiomatic Go patterns\n- **Haskell**: Standard library containers with type-safe functional operations\n- **OCaml**: Standard library with immutable data structures and pattern matching\n\n### Test Coverage\n\nMGen maintains comprehensive test coverage ensuring translation accuracy:\n\n- **821 total tests** across all components and backends\n- Comprehensive backend coverage testing all major Python features\n- Test categories: basics, OOP, comprehensions, string methods, augmented assignment, control flow, integration\n- All tests passing with zero regressions (100%)\n\n## Development Roadmap\n\n### Completed Milestones\n\n- Multi-language backend system with C, C++, Rust, Go, Haskell, and OCaml support\n- Advanced C runtime integration with 50KB+ of runtime libraries\n- Sophisticated Python-to-C conversion with complete function and control flow support\n- Object-oriented programming support across all backends\n- Advanced Python language features: comprehensions, string methods, augmented assignment\n- Complete STC library integration (864KB Smart Template Container library)\n- Architecture consolidation with unified C backend module\n- Professional test organization with 821 tests in focused, single-responsibility files\n- Universal preference system with language-specific customization\n- Production-ready code generation with clean, efficient output\n- 4 production-ready backends (C++, C, Rust, Go) with 100% benchmark success\n\n### Future Development\n\n- **Advanced Frontend Analysis**: Integrate optimization detection and static analysis engine\n- **STC Performance Optimization**: Container specialization and memory layout optimization\n- **Formal Verification**: Theorem proving and memory safety proofs integration\n- **Cross-Language Runtime**: Extend runtime concepts to other backends (C++, Rust, Go)\n- **Performance Benchmarking**: Comprehensive performance analysis across all target languages\n- **IDE Integration**: Language server protocol support for MGen syntax\n- **Web Interface**: Online code conversion tool\n- **Plugin System**: External backend support and extensibility\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fshakfu%2Fmgen","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fshakfu%2Fmgen","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fshakfu%2Fmgen/lists"}