NAME
Language::Befunge - a generic funge interpreter
VERSION
version 5.000
SYNOPSIS
use Language::Befunge;
my $interp = Language::Befunge->new( { file => 'program.bf' } );
$interp->run_code( "param", 7, "foo" );
Or, one can write directly:
my $interp = Language::Befunge->new;
$interp->store_code( <<'END_OF_CODE' );
< @,,,,"foo"a
END_OF_CODE
$interp->run_code;
DESCRIPTION
Enter the realm of topological languages!
This module implements the Funge-98 specifications on a 2D field (also called Befunge). It can also work as a n-funge implementation (3D and more).
This Befunge-98 interpreters assumes the stack and Funge-Space cells of this implementation are 32 bits signed integers (I hope your os understand those integers). This means that the torus (or Cartesian Lahey-Space topology to be more precise) looks like the following:
32-bit Befunge-98
=================
^
|-2,147,483,648
|
| x
<-----------+----------->
-2,147,483,648 | 2,147,483,647
|
y|2,147,483,647
v
This module also implements the Concurrent Funge semantics.
PUBLIC METHODS
new( [params] )
Call directly the Language::Befunge::Interpreter
constructor. Refer to Language::Befunge::Interpreter for more information.
BUGS
Although this module comes with a full set of tests, there may be subtle bugs remaining - or maybe I misinterpreted the Funge-98 specs. Please report any bugs or feature requests to "bug-language-befunge at rt.cpan.org", or through the web interface at <http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Language-Befunge>. I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.
Here is a list of known "bugs", coming from the specs:
- o
-
About the 18th cell pushed by the
y
instruction: Funge specs just tell to push onto the stack the size of the stacks, but nothing is said about how user will retrieve the number of stacks. - o
-
About the load semantics. Once a library is loaded, the interpreter is to put onto the TOSS the fingerprint of the just-loaded library. But nothing is said if the fingerprint is bigger than the maximum cell width (here, 4 bytes). This means that libraries can't have a name bigger than
0x80000000
, ie, more than four letters with the first one smaller thanP
(chr(80)
).Since perl is not so rigid, one can build libraries with more than four letters, but perl will issue a warning about non-portability of numbers greater than
0xffffffff
.
ACKNOWLEDGEMENTS
I would like to thank Chris Pressey, creator of Befunge, who gave a whole new dimension to both coding and obfuscating.
Thanks also to Matti Niemenmaa for his mycology test suite, available at http://users.tkk.fi/~mniemenm/befunge/mycology.html
SEE ALSO
You can find more information on Befunge at http://www.catseye.mb.ca/esoteric/befunge/.
Our git repository is located at https://github.com/jquelin/language-befunge.
You can also look for information on this module at:
AnnoCPAN: Annotated CPAN documentation
CPAN Ratings
Open bugs
AUTHOR
Jerome Quelin
COPYRIGHT AND LICENSE
This software is copyright (c) 2003 by Jerome Quelin.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.