The Charly programming language

This is my try at writing an interpreter of a dynamic language from scratch with my bare hands. It is implemented in Crystal. It is absolutely not production-ready and is meant only for my own learning-purposes.

Syntax and language guide

Take a look at the official website for an introduction to the language.

Using the built-in REPL

You can use the arrow keys to navigate the cursor. Up and down will scroll through the history.

$ charly repl
> 2 + 2
4
> "test"
test
> $ * 4
testtesttesttest
> func increment(a) { a + 1 }
Function
> increment(25)
26
> print("hello world")
hello world
null
> .exit

If you need to pass arguments or flags to a REPL session you can do so via the repl command

charly repl these are all arguments

> ARGV
[these, are, all, arguments]

OS Support

I'm developing on macOS 10.12 so it should work without any problems on that. The CI Build runs on Ubuntu 12.04.5 LTS.

Installation

You will need a working crystal installation.

To install the charly command and automatically copy it to the /usr/bin folder, run install.sh. You will be prompted for your admin password (used to copy to /usr/bin).

CLI options

$ charly -h
Usage: charly [filename] [flags] [arguments]
    -f FLAG, --flag FLAG             Set a flag
    -h, --help                       Print this help message
    -v, --version                    Prints the version number

Flags:
    ast                              Display the AST of the userfile
    tokens                           Display tokens of the userfile
    lint                             Don't execute after parsing (linting)

Atom Syntax Theme

Thanks to @SpargelPlays for modifying the language-javascript package to make it work with Charly.

Github: language-charly

Atom.io: language-charly

Contributors

Contributors

Inspired by

• Javascript
• Ruby

License