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Added the shinglyu/RustPython VM
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‎README.md‎

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# RustPython
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A Python Interpreter written in Rust
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# Code organization
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The files in the top level directory are from [windelbouwman/rspython][rspython] which contains an implementation of the parser and vm in `src/`
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An alternative implementation of python virtual machine that are compatible with CPython parser are from [shinglyu/RustPython][rustpython] and is located in the `VM/` folder.
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We are in the process of merging the two implementation to form a single implementation.
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# Credit
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The initial work was based on [windelbouwman/rspython](https://github.com/windelbouwman/rspython) and [shinglyu/RustPython](https://github.com/shinglyu/RustPython)
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[rspython]: https://github.com/windelbouwman/rspython
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[rustpython]: https://github.com/shinglyu/RustPython
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‎VM/LICENSE‎

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MIT License
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Copyright (c) 2018 Shing Lyu
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.

‎VM/README.md‎

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RustPython
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==============
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A Python interpreter written in Rust
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# Installation
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```
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bash init_env.sh
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```
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# Run
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```
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./test.sh <path/to/file.py> # compile and run
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./test.sh <path/to/file.py> --bytecode # print the bytecode in JSON
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./test.sh <path/to/file.py> --dis # Run python -m dis
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```
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## Manual
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Given a python file `test.py`
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```
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python compile_code.py test.py > test.bytecode
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cd RustPython
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cargo run ../test.bytecode
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```
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# Testing & debugging
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```
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./test_all.sh # Run all tests under tests/
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```
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* If a test is expected to fail or raise exception, add `xfail_*` prefix to the filename.
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## Logging
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```
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RUST_LOG=debug ./tests_all.sh
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```
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# TODOs
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* Native types => Partial
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* Control flow => if(v)
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* assert => OK
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* Structural types (list, tuple, object)
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* Strings
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* Function calls => Blocked by bytecode serializer
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* Modules import
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* Generators
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# Goals
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* Support all builtin functions
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* Runs the [pybenchmark](https://pybenchmarks.org/) benchmark test
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* Run famous/popular python modules (which?)
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* Compatible with CPython 3.6
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# Rust version
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rustc 1.20.0-nightly
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‎VM/RustPython/Cargo.lock‎

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‎VM/RustPython/Cargo.toml‎

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[package]
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name = "rustpython"
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version = "0.1.0"
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authors = ["Shing Lyu <shing.lyu@gmail.com>"]
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[dependencies]
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log = "0.3"
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env_logger = "0.3"
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serde = "0.8.22"
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serde_derive = "0.8"
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serde_json = "0.8"

‎VM/RustPython/src/builtins.rs‎

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use NativeType;
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use std::rc::Rc;
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use std::ops::Deref;
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pub fn print(args: Vec<Rc<NativeType>>) -> NativeType {
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for elem in args {
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// TODO: figure out how python's print vectors
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match elem.deref() {
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&NativeType::NoneType => println!("None"),
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&NativeType::Boolean(ref b)=> {
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if *b {
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println!("True");
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} else {
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println!("False");
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}
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},
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&NativeType::Int(ref x) => println!("{}", x),
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&NativeType::Float(ref x) => println!("{}", x),
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&NativeType::Str(ref x) => println!("{}", x),
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&NativeType::Unicode(ref x) => println!("{}", x),
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_ => panic!("Print for {:?} not implemented yet", elem),
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/*
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List(Vec<NativeType>),
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Tuple(Vec<NativeType>),
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Iter(Vec<NativeType>), // TODO: use Iterator instead
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Code(PyCodeObject),
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Function(Function),
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#[serde(skip_serializing, skip_deserializing)]
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NativeFunction(fn(Vec<NativeType>) -> NativeType ),
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*/
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}
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}
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NativeType::NoneType
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}
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pub fn len(args: Vec<Rc<NativeType>>) -> NativeType {
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if args.len() != 1 {
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panic!("len(s) expects exactly one parameter");
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}
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let len = match args[0].deref() {
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&NativeType::List(ref l) => l.borrow().len(),
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&NativeType::Tuple(ref t) => t.len(),
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&NativeType::Str(ref s) => s.len(),
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_ => panic!("TypeError: object of this type has no len()")
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};
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NativeType::Int(len as i32)
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}

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