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puck-lang

v0.2.0

Published

Puck is a compile to js language. It has (a goal to have) syntax and semantics that are inspired from Rust but adapted to work better in a web environment with for example good JS interop.

Downloads

2

Readme

Puck

Puck is a compile to js language. It has (a goal to have) syntax and semantics that are inspired from Rust but adapted to work better in a web environment with for example good JS interop.

Goals

  • Trait based type system (See Rust)
  • Good js interop (npm support, unsafe access and calls)
  • Explicit mutability
  • Simple project setup

Basic Concepts

Explicit mutability, a variable is immutable if not declared with the mut modifier.

Everything is an expression and the last value of a block will be the value of a block, meaning that you can assign the result of an if expression or any use return if you need an early return of the function.

import 'puck:js' as {process}

fn greet(name) {
  let mut phrase = 'Hello, '
  phrase += 
    if name 
      then name 
      else 'World'
  phrase += '!'

  print(phrase)
}

greet(process.argv[2])

Getting Started

The compiler is currently a mix of TypeScript and Puck but will eventually only be written in puck, until then, run npm run watch to build and watch the TS code.

The build tool is called puck and the compiler puckc. Binaries are placed in bin/ and library files in lib/

is included in the repo. Add export PATH=$PATH:dist/bin to your .bashrc or .zshrc, or prefix the following commands with dist/bin/.

Run puckc some/file some/other/file to build the specified file(s).
Run puck build to build the project.
Run puck test to run the testsuite.
Run cases to run compilation tests.
Run cases update-baselines to update the baselines (accept the current behaviour) for the compilation tests.
Run self-test to run a self test of the compiler that validates that the compiler can reproduce itself.

Editors

There are plugins avalible for Atom and Visual Studio Code, as well as a Textmate grammar that can be used to create plugins for most editors. See puck-lang/editors for details.