(begin "readme")

ráð (Java + gammel-norsk for "advice/råd")

A simple Lisp written in Java.

Building

mvn package

Or, using the Justfile:

just package

Running

just repl

Voila:

> (+ 1 2)
>>: 3.0
> ((lambda (x) (+ 1 x)) 2)
>>: 3.0

Show current env by typing _env.

Syntax

Atoms:

2
3
"hello"
#t
#f

Quotation:

(quote (1 2 3))
'(1 2 3)

Assignment:

(define f (lambda (n) (+ n 1)))
;; Following is not implemented (not comments either):
(define (adder n) (lambda (n) (+ n 1)))

Sequence of forms (returns 4):

(begin
  (define x 2)
  (+ x 2))

Lambdas:

(lambda (a b c) (+ a b c))

Conditional:

(if #t "true" "not true")

Want to have:

• cond
• let
• letrec
• map, filter, etc
• Vararg lambdas
• Quasiquote

References

https://courses.cs.washington.edu/courses/cse341/04wi/lectures/12-scheme.html

Recursive Functions of Symbolic Expressions Their Computation by Machine, Part I https://dl.acm.org/doi/pdf/10.1145/367177.367199 https://www-formal.stanford.edu/jmc/recursive.pdf

Lots of tests to run later: https://github.com/ashinn/chibi-scheme/blob/master/tests/r5rs-tests.scm

Eliza Chatbot http://lisp.plasticki.com/show?24GC https://github.com/norvig/paip-lisp/blob/main/lisp/eliza.lisp

Other implementations

Lisp in 1k lines of C

https://github.com/Robert-van-Engelen/lispg

Peter Norvig's https://norvig.com/lispy.html

GRScheme

Fun

Poems and jokes about Lisp https://web.archive.org/web/20170320142011/http://www.gotlisp.com/lambda/lambda.txt

List of Lisp humor https://www.cliki.net/humor

Other

How Lisp Became God's Own Programming Language

What is the origin and meaning of the phrase “Lambda the ultimate?”

Lots of pictures of old Lisp machines https://www.ifis.uni-luebeck.de/~moeller/symbolics-info/index.html

Scheme tutorial https://www.cs.rpi.edu/academics/courses/fall00/ai/scheme/reference/Scheme.html

Scheme grammar From this book: https://www.scheme.com/tspl3/

Scheme books

Annotated Lisp bibliography https://simondobson.org/development/annotated-lisp-bibliography/