debian man page for acme::brainfuck

Acme::Brainfuck(3)					User Contributed Perl Documentation					Acme::Brainfuck(3)

NAME
       Acme::Brainfuck - Embed Brainfuck in your perl code

SYNOPSIS
	#!/usr/bin/env perl
	use Acme::Brainfuck;

	print 'Hello world!', chr ++++++++++. ;

DESCRIPTION
       Brainfuck is about the tiniest Turing-complete programming language you can get.  A language is Turing-complete if it can model the opera-
       tions of a Turing machine--an abstract model of a computer defined by the British mathematician Alan Turing in 1936.  A Turing machine con-
       sists only of an endless sequence of memory cells and a pointer to one particular memory cell.  Yet it is theoretically capable of perform-
       ing any computation. With this module, you can embed Brainfuck instructions delimited by whitespace into your perl code.  It will be trans-
       lated into Perl as parsed.  Brainfuck has just just 8 instructions (well more in this implementation, see "Extensions to ANSI Brainfuck"
       below.) which are as follows

       Instructions

       + Increment
	   Increase the value of the current memory cell by one.

       - Decrement
	   Decrease the value of the current memory cell by one.

       > Forward
	   Move the pointer to the next memory cell.

       < Back
	   Move the pointer to the previous memory cell.

       , Input
	   Read a byte from Standard Input and store it in the current memory cell.

       . Output
	   Write the value of the current memory cell to standard output.

       [ Loop
	   If the value of the current memory cell is 0, continue to the cell after the next ']'.

       ] Next
	   Go back to the last previous '['.

       Extensions to ANSI Brainfuck

       This implementation has extra instructions available.  In order to avoid such terrible bloat, they are only available if you use the ver-
       bose pragma like so:

       use Acme::Brainfuck qw/verbose/;

       The extra instructions are:

       ~ Reset
	   Resets the pointer to the first memory cell and clear all memory cells.

       # Peek
	   Prints the values of the memory pointer and the current memory cell to STDERR.  See also "Debugging" below.

       Debugging

       By using the debug pragma like this:

       use Acme::Brainfuck qw/debug/;

       you can dump out the generated perl code.  (Caution: it is not pretty.)	The key to understanding it is that the memory pointer is repre-
       sented by $p, and the memory array by @m  Therefore the	value of the current memory cell is $m[$p].

RETURN VALUE
       Each sequence of Brainfuck instructions becomes a Perl block and returns the value of the current memory cell.

EXAMPLES
       JABH

	#!/usr/bin/env perl
	use Acme::Brainfuck;
	print "Just another ";
	++++++[>++++++++++++++++<-]>
	++.--
	>+++[<++++++>-]<.>[-]+++[<------>-]<
	+.-
	+++++++++.---------
	++++++++++++++.--------------
	++++++.------
	>+++[<+++++++>-]<.>[-]+++[<------->-]<
	+++.---
	+++++++++++.-----------
	print " hacker.
";

       Countdown

	#!/usr/bin/env perl
	use strict;
	use Acme::Brainfuck qw/verbose/;

	print "Countdown commencing...
";
	++++++++++[>+>+<<-]
	>>+++++++++++++++++++++++++++++++++++++++++++++++<<
	++++++++++[>>.-<.<-]
	print "We have liftoff!
";

       Reverse

	#!/usr/bin/env perl
	use Acme::Brainfuck qw/verbose/;

	while(1)
	{
	  print "Say something to Backwards Man and then press enter: ";
	  +[->,----------]<
	  print 'Backwards Man says, "';
	  [+++++++++++.<]<
	  print "" to you too.
";
	  ~
	}

       Math

	#!/usr/bin/env perl
	use Acme::Brainfuck;
	use strict;
	use warnings;

	my $answer = +++[>++++++<-]> ;

	print "3 * 6 = $answer 
";

VERSION
	1.1.1 Apr 06, 2004

AUTHOR
	Jaldhar H. Vyas E<lt>jaldhar@braincells.comE<gt>

THANKS
       Urban Mueller - The inventor of Brainfuck.

       Damian Conway - For twisting perl to hitherto unimaginable heights of weirdness.

       Marco Nippula <http://www.hut.fi/~mnippula/> - Some code in this module comes from his brainfuck.pl

       Mr. Rock - Who has a nice Brainfuck tutorial at <http://www.cydathria.com/bf/>.	Some of the example code comes from there.

COPYRIGHT AND LICENSE
	Copyright (c) 2004, Consolidated Braincells Inc.
	Licensed with no warranties under the Crowley Public License:

	"Do what thou wilt shall be the whole of the license."

perl v5.8.3							    2004-04-06							Acme::Brainfuck(3)