Writing a Lisp: Continuations

, in Lisp, Haskell

This week I added continuations to my Lisp. They’re a fascinating feature, and a popular demand in the survey. It has been the most challenging feature so far, both to implement and explain, but the result has been worth it.

Writing a Lisp: Reader Macro’s

, in Lisp, Haskell

Monday’s survey revealed that Reader Macro’s are your most requested feature. They replace built-in syntax, and enable users to extend the syntax from within the language. Implementing them right is difficult, however. Let’s try.

Writing a Lisp: help me decide what to tackle next

, in Lisp, Survey

Hi! My name is Rein van der Woerd.
I’m currently in the process of developing a Lisp, for both learning and teaching.
My goal is to derive the best possible language from the smallest set of core features. Your answers to these will help me know what will help you learn the most.

Writing a Lisp: Debugger

, in Lisp, Haskell

To make debugging easier, I added a simple pry-style debugger to my lisp. It immediately spawns a new repl in the current envirment, allowing you to poke around at will. Debug repl’s can be nested to arbitrary depth, and exited with :q.

Writing a Lisp

, in Lisp, Haskell

I’ve been working on my first general purpose programming language last week, guided by the books SICP and Write Yourself a Scheme in 48 Hours. This has been a goal of mine for a long time, but it somehow always looked intimidating. I was glad to find out that interpreters can actually be astonishingly simple, and would like to share what I learned along the way.