Toyjs javascript interpreter.

This repository contains the code of a toy javascript interpreter. Built for experimentation with building dynamic languages.

This interpreter is very much under development and lacks support for a large part of the javascript language.

You can play around with an previous version of the interpreter in your browser here

Features

• Register based bytecode VM
• Handwritten parser.
• Traditional Lexer to Parser to ast to compiler to bytecode design.
• Almost safe sweep and trace GC
• Minimal dependencies.

Current State

The engine is currently undergoing a rewrite and is in a non-functional state.

But you can play around with the currently functional parts of the interpreter.

Running the interpreter

The VM is currently very bare-bones, with only a very small number of instructions implemented. A simple example for the VM can ran with

cargo run --example vm

All examples take either a file name or assume a script will be piped into stdin.

The interpreter has varies tools for printing data-structures and generated source information.

For printing a AST you can use

cargo run --example parse

The lexer can similarly be run on code with

cargo run --example lex

A overview of symbol information produced by the compiler can be printed with

cargo run --example resolve

A script can be compiled and the compiled instructions can be dumped with

cargo run --example compile