Ringfuck

Not to be confused with Ryan Hornby's 2023 SIGBOVIK submission.

Ringfuck is a brainfuck extension/derivative whose memory is a stack of concentric rings.

Instructions

Command	Description
>	Turns the current ring one cell clockwise
<	Turns the current ring one cell anticlockwise
(	Moves the head inward one ring; ignored on ring 0
)	Moves the head outward one ring, creating it if needed
*	Turns every ring one cell clockwise
+	Increments the cell at twelve o'clock
-	Decrements it
[	Jumps past the matching ] if that cell is 0
]	Jumps back to the matching [ if it is not 0
.	Outputs the cell as a character
,	Reads one byte into the cell; 0 at end of input
:	Outputs the cell as a decimal number
#	Debug: dumps every ring and its angle

Examples

Mini-interpreter

import sys
P=2,3,5,7,11,13,17,19,23,29,31,37
c=open(sys.argv[1]).read();J={};s=[]
for k,v in enumerate(c):
	if'['==v:s+=k,
	if']'==v:a=s.pop();J[a]=k;J[k]=a
M={};T=[0]*12;S=h=i=0;I=sys.stdin.buffer.read()
while i<len(c):
	o=c[i];x=h,(T[h]+S)%P[h];V=M.get(x,0)
	if o in'<>':T[h]+=o=='>'or-1
	if o=='(':h-=h>0
	if o==')':h+=h<11
	if o=='*':S+=1
	if o in'+-':M[x]=V+(o=='+'or-1)
	if o in'.:':print(end=(chr(V%256),str(V))[o==':'])
	if o==',':M[x]=(I+b'\0')[0];I=I[1:]
	if o in'[]'and(V!=0)==(o==']'):i=J[i]
	i+=1

cat

,[.,]

"Hello World!"

++++++++[)++++[)++)+++)+++)+((((-])+)+)-))+[(](-])).)---.+++++++..+++.)).(-.(.+++.------.--------.))+.)++.

FizzBuzz

)+)+))++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
++++++++++++++++++++++++++++++++++[-*+((([-)))>+>>>+<<<<(((])))>>>>[-(((
+)))](([-))<<+>>+((]))[-((+))]<[-]+<<[->>>>+++++++++++++++++++++++++++++
+++++++++++++++++++++++++++++++++++++++++.++++++++++++++++++++++++++++++
+++++.+++++++++++++++++..-----------------------------------------------
------------------------------------------------------------------------
---<<[-]<<]>[->>>+++++++++++++++++++++++++++++++++++++++++++++++++++++++
+++++++++++.+++++++++++++++++++++++++++++++++++++++++++++++++++.+++++..-
------------------------------------------------------------------------
-------------------------------------------------<<[-]<]>[-<<<:>>>]>>+++
+++++++.---------->>>>>]

Primes

+)+)+)+*)+*<+*<+*<+*<+*<+*<+*<+*<+*<+<++++++++++++++++++++++++++++++++++
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
++++[-*+>[-]+(((([-))))>+>+<<((((]))))>>[-((((+))))]<[-<[-]>]((([-)))+>+
<(((])))>[-(((+)))]<[-<[-]>](([-))+>+<((]))>[-((+))]<[-<[-]>]([-)+>+<(])
>[-(+)]<[-<[-]>]<[-<:>>>>++++++++++.----------<<<]<<]

Collatz

))))>>>>+[[-]>[-],[----------[--------------------------------------<<<<
<[-<<<<<+>>>>>]<<<<<[->>>>>++++++++++<<<<<]<[-<<<<<+>>>>>]<+>]]<]+[[-]<<
<<:>++++++++++.----------<[->+>[-<->>+<]<[->+<]<]>+>[-<->>[>+<[-<<<+++++
+>>>]]<<<++++>>]<[->>[>+<[-<<<+>>>]]<<]>>>]

Truth Machine

)
,>++++++[<-------->-]
<[>+++++++[>+++++++<-]>[.]]
>++++++[>++++++++<-]>.

Fibonacci

))>>+<<++++++++++++++++++++[->:<<++++++++++.----------<<[->+<<+>]<[->+<]
>>[-<<+>>]>>]

Computational class

As as an extension of brainfuck (and derivative) ringfuck is Turing complete.

See also

• Brainfuck_extensions
• Miui's ringfuck interpreter
• Ring-around-the-Rosie by User:Salpynx
• Ryan Hornby's 2023 SIGBOVIK submission