From: pjb@... (Pascal J. Bourguignon)
Date: 2009-08-03T17:20:17+09:00
Subject: Re: RUBY vs COMMON LISP

fft1976 <fft1976@gmail.com> writes:
> By the way, here is in 1 line of BF, a complete BF reader that is able
> to
> read all the BF syntax needed to write it:
>
> ,+[-.,+]
>
> Here's how to try it:
>
> $ sudo apt-get install bf
> $ cat > reader.bf
> ,+[-.,+]
> $ bf reader.bf < reader.bf
>
> Your 150 lines don't look very impressive now, do they?
>
> Ruby < Lisp <<< BF!

I specified a syntactic reader.  Not just a reader.  READ-SEQUENCE, or
a loop on READ-CHAR is trivial both in Ruby and in Lisp.

Building a data structure isomorphe to the syntax of the language is
less trivial.  First you will have to think about how to build an
abstract data structure in BF.  Have fun!

-- 
__Pascal Bourguignon__