WebLisp: A Lisp Interpreter that runs inside the browser | Hacker News Reader

WebLisp: A Lisp Interpreter that runs inside the browser

christophdietze.com

27 pointsfluffster16 comments

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And a quick shout-out to JSLisp : http://joeganley.com/code/jslisp.html . That was an educational piece of JS for me.

Outstanding.

very cool!

Hey, thanks! I wrote that. I went here to post it, and it was already here.

Arclite is a subset of Arc written in Javascript.

http://jonathan.tang.name/files/arclite/index.html

Thanks, that looks interesting.

Sweet. It appears to have proper tail recursion.

(define (fib n) (fib-help n (lambda (fn fn-1) fn)))

(define (fib-help n k) (if (<= n 1) (k 1 1) (fib-help (- n 1) (lambda (fn-1 fn-2) (k (+ fn-1 fn-2) fn-1)))))

(fib 1000)

So, are there any in-browser lisps that, you know, do something? Maybe one that plays in the Pipes space, letting you work with feeds of various sorts?

http://en.wikipedia.org/wiki/Greenspun%27s_Tenth_Rule

The Tenth Rule applies only to "sufficiently complicated" programs that add so many features and support libraries that they become a poor subset of Lisp.

Implementing your a subset dialect of your favorite language in a poor/hostile/new environment is quite hackish, imo.

How many of these are there anyway?

Franz, Inc. Allegro Common Lisp has Prompt and Maxima: * http://www.franz.com/products/allegrocl/prompt/javatelnet.ht... * http://www.franz.com/success/demos/maxima/javatelnet.html

That is NOT a "web" Lisp; you're interacting via telnet with Franz Common Lisp, a piece of REAL software with 20+ years of history.

Type this into it:

  (disassemble (lambda ()))

It should spit an assembly language listing.

(disassemble (lambda ()))

Not a HN textarea form input, you type that into a Common Lisp repl (interactive shell.) It should look like this:

  CG-USER(1): (disassemble (lambda ()))
  ;; disassembly of #<Function (:ANONYMOUS-LAMBDA 130) @ #x20ec218a>
  ;; formals: 

  ;; code start: #x20ec214c:
     0: e3 03       jcxz	5
     2: ff 57 8b  call	*[edi-117]      ; SYS::TRAP-WNAERR
     5: 80 7f cb 00 cmpb	[edi-53],$0   ; SYS::C_INTERRUPT-PENDING
     9: 74 03       jz	14
     11: ff 57 87  call	*[edi-121]      ; SYS::TRAP-SIGNAL-HIT
     14: 8b c7       movl	eax,edi
     16: f8          clc
     17: 8b 75 fc  movl	esi,[ebp-4]
     20: c3          ret
     21: 90          nop

Proof that it's not a javascript "web lisp" :-)

No macros?

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