Acme::Brainfuck (3pm)

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

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

Brainfuck is about the tiniest Turing-complete programming language you can get. A language is Turing-complete if it can model the operations of a Turing machine\*(--an abstract model of a computer defined by the British mathematician Alan Turing in 1936. A Turing machine consists only of an endless sequence of memory cells and a pointer to one particular memory cell. Yet it is theoretically capable of performing any computation. With this module, you can embed Brainfuck instructions delimited by whitespace into your perl code. It will be translated into Perl as parsed. Brainfuck has just just 8 instructions (well more in this implementation, see \*(L"Extensions to \s-1ANSI\s0 Brainfuck\*(R" below.) which are as follows

\$1

+ 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 '['. This implementation has extra instructions available. In order to avoid such terrible bloat, they are only available if you use the verbose 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 \s-1STDERR\s0. See also \*(L"Debugging\*(R" below. 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 represented by $p, and the memory array by @m Therefore the value of the current memory cell is $m[$p].

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

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

print "Countdown commencing...\n"; ++++++++++[>+>+<<-] >>+++++++++++++++++++++++++++++++++++++++++++++++<< ++++++++++[>>.-<.<-] print "We have liftoff!\n"; #!/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.\n"; ~ } #!/usr/bin/env perl use Acme::Brainfuck; use strict; use warnings;

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

print "3 * 6 = $answer \n";

1.1.1 Apr 06, 2004

Jaldhar H. Vyas E<lt>[email protected]<gt>

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 (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."