https://github.com/renatoalencar/lisper

A very simple implementation of Lisp built in Python
https://github.com/renatoalencar/lisper

interpreter lecture lisp lisp-interpreter python

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A very simple implementation of Lisp built in Python

• Host: GitHub
• URL: https://github.com/renatoalencar/lisper
• Owner: renatoalencar
• License: mit
• Created: 2019-08-27T01:01:11.000Z (over 5 years ago)
• Default Branch: master
• Last Pushed: 2020-11-01T05:01:59.000Z (over 4 years ago)
• Last Synced: 2024-11-07T12:53:31.171Z (3 months ago)
• Topics: interpreter, lecture, lisp, lisp-interpreter, python
• Language: Python
• Homepage:
• Size: 7.81 KB
• Stars: 2
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# Lisper

A very simple Lisper interpreter that supports only numbers.

## Introduction

I was there, on a sunday morning watching videos on YouTube when I get to [this Lecture by

Hal Abelson](https://youtu.be/-J_xL4IGhJA) on a introduction to Lisp. Is quite simple, it's almost an introduction to

programming itself and introduces the syntax and some operators of Lisp. It also introduces

the Haron of Alexandria algorithm of solving a square root of a number. So I thought: "Why

not build a Lisp interpreter that supports the exactly same specs he introduces on this

Lecture?".

And so I spent my sunday writing a very simple interpreter, and that here is.

## Running

The example in the lecture can be found in the file [sqrt.lisp](./sqrt.lisp), just pass the file name

as an argument like this:

```sh

$ ./lisper.py sqrt.lisp

1.4142135623746899

```

You can run `./lisper.py -h` to get some other options available like printing the AST or the

resulting value of each evaluation.

## Issues

This is a simple implementations, so here are a few known issues:

* It's not optimized;

* Only support arithmetic operations;

* There is no interop with Python;

* Does not keep track of lines and columns on errors.

## License

[MIT](./LICENSE)