Calculator
This repository contains the source code for a simple CLI desk-type calculator written in Raku.
I wrote it mostly to see how Raku solves the expression problem using multimethods.
The code also serves as an introductory example of how to implement a lexer, a recursive descent parser, and a simple tree walking interpreter, all in a couple hundred lines of clean, documented, well-tested and performant Raku code (roughly in that order).
The parser code was inspired by Bob Nystrom's excellent (and free!) book "Crafting Interpreters". If you're reading this, I bet you'll love the book. Be sure to check it out.
Installation
Simply clone this repo (using, e.g.,
git clone https://github.com/heyajulia/calculator or using the green
Download Code button on GitHub), and run main.raku with a command like
raku main.raku.
Contributing
If you notice a bug, feel free to open an issue. Also, I'm a Raku beginner, so if you see something that can be done in a better/cleaner/more idiomatic way, I'm all ears.
My hope is that you will find this code useful, and use it (or parts of it) as a starting point for more complex interpeters.
License
The code is licensed under the terms of the Artistic License, version 2.0.