https://github.com/epellis/esta

Interpreted language and bytecode VM of my own design written in Rust [Unmaintained]
https://github.com/epellis/esta

interpreter lalrpop programming-language rust stack-based virtual-machine wasm

Last synced: 23 days ago
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Interpreted language and bytecode VM of my own design written in Rust [Unmaintained]

• Host: GitHub
• URL: https://github.com/epellis/esta
• Owner: epellis
• Archived: true
• Created: 2019-04-09T02:20:22.000Z (over 5 years ago)
• Default Branch: master
• Last Pushed: 2019-05-19T03:21:53.000Z (over 5 years ago)
• Last Synced: 2024-08-10T14:19:00.230Z (4 months ago)
• Topics: interpreter, lalrpop, programming-language, rust, stack-based, virtual-machine, wasm
• Language: Rust
• Homepage:
• Size: 189 KB
• Stars: 28
• Watchers: 3
• Forks: 2
• Open Issues: 2
• Metadata Files:
  • Readme: README.md

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README

        
# Esta

[![CircleCI](https://circleci.com/gh/epellis/esta.svg?style=shield)](https://circleci.com/gh/epellis/esta)

![GitHub code size in bytes](https://img.shields.io/github/languages/code-size/epellis/esta.svg?style=popout-square)

Esta is a gradually typed, interpreted language and virtual machine implementation of my own design written in Rust

_Interpreted_: `.est` source code is compiled into byte code (simple assembly instructions)

                and run on the Esta VM.

_Gradually Typed_: The Esta Interpreter can infer variable type (e.g.):

```c

var a: num = 4;     // Explicitly declare a is an int

var c = a + b;      // Since c and b have unknown types, they adopt a's type

```

## Syntax

Esta's syntax is an LR(1) grammar that takes most of it's ideas from

the C-family of languages. It is most similar to JavaScript and Go.

Here is an example snippet of code:

```c

fun multiply(a, b) {

    if a <= 0 {

        return b;

    } else {

        return b + multiply(a - 1, b);

    }

}

print(multiply(3, 4) == 12);

```

## Blog Posts

- [Writing and traversing an AST in Rust](http://nedellis.com/2019/05/08/esta_1/)

## Development

You are welcome to check the project out and try some of the demos provided.

__WARNING__: Please note that at it's current state, Esta is pre-alpha and is experiences

radical, breaking changes daily.

```

git clone https://github.com/epellis/esta.git

cd esta

cargo build

RUST_LOG=esta=debug cargo run demos/hello.est

```

You can also measure performance by evaluating the

Fibonacci Sequence using a naive recursive O(n^2) algorithm.

```

cargo bench

```

## Deployment

_WIP_: Installer coming soon

```

cargo run --release my_program.est

```