ArkScript

• Documentation
• Discord server: invite link, to discuss the specification of the language and receive help
• Modules

Nota bene: the project is referred as "Ark" and as "ArkScript". The official public name is "ArkScript" since "Ark" is already being used by another language

Key features

ArkScript is

• small: the core fit under 8000 lines of code ; also small in terms of keywords (only 10)
• a scripting language: very easy to embed it in your projects. Registering your own functions in the language is made easy
• portable: a unique bytecode which can be run everywhere the virtual machine is
• a functional language: every parameter is passed by value, everything is immutable unless specified
• powerful: provides closures and explicit capture
• promoting functionalities before performances: expressiveness often brings more productivity, though performances aren't left behind
• a Lisp inspired language, with fewer parentheses: [...] is expanded to (list ...) and {} to (begin ...)
• extensible: supports C++ module to use it in the language, adding functionalities

Also it has:

• macros: if/else, values, and functions
• tail call optimization
• a REPL with autocompletion and coloration
• a growing standard library, composed of ArkScript code (under lib/std/) and C++ (under lib/ext/)
• a lot of unit tests (but never enough), which are ran before every release to ensure everything works as expected
• docker images:
  • stable, built after each release
  • nightly, built after each commit

Examples

Fibonacci suite

(let fibo (fun (n)
    (if (< n 2)
        n
        (+ (fibo (- n 1)) (fibo (- n 2))))))

(print (fibo 28))  # display 317811

More or less game

(import "random.arkm")
(import "Math.ark")

(let number (mod (math:abs (random)) 10000))

(let game (fun () {
    (let impl (fun (tries) {
        (let guess (toNumber (input "Input a numeric value: ")))

        (if (< guess number)
            {
                (print "It's more than " guess)
                (impl (+ tries 1))}
            (if (= guess number)
                {
                    (print "You found it!")
                    tries }
                {
                    (print "It's less than " guess)
                    (impl (+ tries 1))}))}))

    (let tries (impl 0))
    (print "You won in " tries " tries.")}))

(game)

More examples are available inside examples/.

Installation

You can either use docker:

docker pull arkscript/stable:latest

# or use the most updated repo
docker pull arkscript/nightly:latest

or build the project with CMake and install it with CMake:

cmake --install build

Contributing

• First, fork the repository
• Then, clone your fork: git clone git@github.com:username/Ark.git
• Create a branch for your feature: git checkout -b feat-my-awesome-idea
• When you're done, push it to your fork and submit a pull request

Make sure you follow the contribution guidelines before submitting your pull request!

Don't know what to work on? No worries, we have a list of things to do 😉

Related projects

We have other projects tightly related to ArkScript, which aren't necessarily C++ oriented:

• the Request For Comments, where we discuss new features for the language
• the standard library, written in ArkScript itself
• the standard library modules, extending the capacities of the language, written in C++
• ArkDoc, a documentation generator à la doxygen for ArkScript, written in Python 3
• our website written in HTML, CSS and JavaScript

Our beloved contributors

Full list here.

Coding guidelines for contributing

See C++ Coding guidelines if you want to contribute to ArkScript compiler / runtime.

Also, see ArkScript Coding guidelines for other files, written in ArkScript.

For performance reasons, some functions might be written in C++, in include/Ark/Builtins/Builtins.hpp and src/Builtins/.

Code structure

Building

Dependencies

• C++17
• CMake >= 3.12
• Visual Studio >= 11 (on Windows)
• On macOS versions prior to 10.15, libc++ lacks filesystem in the standard library.
  • Install a newer compiler using Homebrew: brew install gcc && brew link gcc
  • Pass compiler path to cmake in the build step: -DCMAKE_CXX_COMPILER=/usr/local/bin/g++-9

All the external libraries we use are already included in thirdparties.

Through CMake

Different CMake switches are available to customize the build:

• -DARK_BUILD_EXE to generate an executable, defaults to Off, building a shared library only
• -DARK_ENABLE_SYSTEM to enable sys:exec (execute shell commands without restrictions), defaults to On
• -DARK_PROFILER_COUNT to count every creation/copy/move of the internal value type, defaults to Off
• -DARK_PROFILER_MIPS to enable the MIPS counting, defaults to Off
• -DARK_NO_STDLIB to avoid the installation of the ArkScript standard library
• -DARK_BUILD_MODULES to trigger the modules build
• -DARK_SANITIZERS to enable ASAN and UBSAN

# first, clone it
git clone --depth=50 --branch=dev https://github.com/ArkScript-lang/Ark.git
cd Ark
git submodule update --init --recursive
# building Ark
cmake . -Bbuild -DCMAKE_BUILD_TYPE=Release -DARK_BUILD_EXE=On
cmake --build build --config Release
# installing Ark (might need administrative privileges)
cmake --install build --config Release

Desired output of arkscript --help:

DESCRIPTION
        ArkScript programming language

SYNOPSIS
        arkscript -h
        arkscript -v
        arkscript --dev-info
        arkscript -e <expression>
        arkscript -c <file> [-d]
        arkscript -bcr <file> -on
        arkscript -bcr <file> [-(a|st|vt)] [-s <start> <end>]
        arkscript -bcr <file> [-cs] [-p <page>]
        arkscript <file> [-d] [-L <lib_dir>]

OPTIONS
        -h, --help                  Display this message
        -v, --version               Display ArkScript version and exit
        --dev-info                  Display development information and exit
        -e, --eval                  Evaluate ArkScript expression
        -c, --compile               Compile the given program to bytecode, but do not run
        -d, --debug...              Increase debug level (default: 0)
        -bcr, --bytecode-reader     Launch the bytecode reader
        -on, --only-names           Display only the bytecode segments names and sizes
        -a, --all                   Display all the bytecode segments (default)
        -st, --symbols              Display only the symbols table
        -vt, --values               Display only the values table
        -s, --slice                 Select a slice of instructions in the bytecode
        -cs, --code                 Display only the code segments
        -p, --page                  Set the bytecode reader code segment to display
        -L, --lib                   Set the location of the ArkScript standard library. Paths can be
                                    delimited by ';'

LICENSE
        Mozilla Public License 2.0

In your own project

Please refer to the embedding ArkScript tutorial.

Performances

See https://github.com/ArkScript-lang/benchmarks

Games

You can find a snake created in ArkScript in the folder examples/games/snake (run it from there, otherwise it won't find the font and the sprites ; you won't need to install the SFML).

Controls are the arrows (left, right, up and down), the game closes itself when you successfully collect the 3 apples.

The donators

Huge thanks to those people for their donations to support the project:

• TheCountVEVO
• llexto
• COUR Eloïse
• AKPINAR Dylan
• Ryan C. Gordon through his 2022 Microgrant

Credits

This project was inspired by gameprogramingpatterns and ofan lisp.cpp

Copyright and Licence information

Copyright (c) 2019-2021 Alexandre Plateau. All rights reserved.

This ArkScript distribution contains no GNU GPL code, which means it can be used in proprietary projects.