Brainfunk

Overview

Brainfunk is derivative of Brainfuck language with aims to:

• Unify cell pointer and cell value increment and decrement operations to single + and - operations. Remove > and < operations.
• Fast copy instruction for instant data transfer usable between all address spaces.
• Macro definition for custom symbol definition and code reduction
• Read program space
• Multiple data pointers
• Multiple I/O ports for additional hardware addressing
• Execution of standard brainfuck code
• Absolute integer constants
• Stack support (PUSH, POP, PEEK)
• Call subroutins with return

Base commands

Command	Description
^	Increment selected object
v	Decrement selected object
(	Jump past the matching ) if the object value is zero
)	Jump back to the matching ( if the object value is nonzero
@	Save object index as previous state. Set new object selection index to 0. Index 0 means accumulator.
$	Increment object selection index
~	Copy value from previous selected object to current selected object
:	Start macro, first symbol to the right is new defined symbol
;	End macro started by :

Object table

Index	Short name	Name	Area
0	A	Accumulator	Registers
1	DP	Data pointer	Registers
2	(DP)	Data value	Data memory
3	IP	Interface pointer	Registers
4	(IP)	Interface value	I/O ports
5	PC	Program counter	Registers
6	PP	Program pointer	Registers
7	(PP)	Program value	Program memory
8	SP	Stack pointer	Registers
9	(SP)	Stack value	Data memory
10	DP2	Data pointer 2	Registers
11	(DP2)	Data value 2	Data memory

Port address table

Address	Description
0	Null
1	Standard output
2	Standard input
3	Delay [ms]
4	Sound [Hz]

Brainfuck compatibility code

These are defined as macros for easy brainfuck code inclusion.

Symbol	Code
+	@$$^
-	@$$v
<	@$^
>	@$v
[	@$$(
]	@$$)
,	@$$$(v)^^@$$@$$$$~
.	@$$$(v)^@$$$$@$$~

Aditional macros

Symbol	Code	Description
#	@$	Shortcut for data pointer DP object
*	@$$	Shortcut for data value (DP) object
&	@$$$	Shortcut for interface address IP object
%	@$$$$	Shortcut for interface value (IP) object
?	@$$$$$	Shortcut for program counter PC object
"	@$$$$$$$$	Shortcut for stack pointer SP object
'	@$$$$$$$$$	Shortcut for stack top value (SP) object
!	(v)	Clear selected object.

Sample code

Description	Brainfuck	Brainfunk
Increment accumulator		@^
Decrement accumulator		@v
Cat	,[.,]	,[.,]
Clear accumulator		@!
Move value	>[-]<[->+<]	*@~*!#^@*~
Copy value	>[-]>[-]<<[->+>+<<]>>[-<<+>>]	*@~#^@*~
Swap values	>[-]<<[->>+<<]>[-<+>]>[-<+>]	*@~#^^@*~#v*@~#v@*~#^^*@~#v@*~
Jump to accumulator (Moves A to PC)		@?~
Halt program (Decrement PC)		?v
Push A to stack		"v@'~
Pop A from stack		'@~"^
Peek top stack item to A		'@~
Remove top stack item		"^
Call subroutine		?@~"v@'~@?~
Return from subroutine		'@~"^@^^^^^^^^^?~

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