NullScript 2

NullScript 2 is a esolang written by a stone arachnid. It is a superset of NullScript 1 and inspired by Deadfish~ and bf. It stores data in a 256-cell tape, and has an 8-item FIFO parameter queue used primarily for copying data between cells and mathematical operations. There is a cell pointer that can look at one cell at a time. All the cells default to zero.

Commands

These are NullScript 2's 19 commands:

tcell group
[	Decrement the current cell
]	Increment the current cell
;	Square the current cell
.	Print the current cell as a number
,	Print the current cell as a character
~	Reset the current cell to 0
stdin group
&	Take an integer as input and put in the current cell.
meta group
<	Move the cell pointer left.
>	Move the cell pointer right.
*	Push the current cell to the parameter queue
'	Take the value from the parameter queue and put it into the current cell
math group
+	Add two numbers from the parameter queue and put it into the current cell
-	Subtract two numbers from the parameter queue and put it into the current cell
x	Multiply two numbers from the parameter queue and put it into the current cell
/	Divide two numbers from the parameter queue and put it into the current cell
"	Divide two numbers from the parameter queue and put the remainder into the current cell
jump group
{	If the current cell is 0, jump to the next }. If there is none, jump to the end of the program.
}	Jump to the previous {. If there is none, jump to the start of the program.
q	Jump to the end of the program.

Implementation notes

• When a , is executed on a cell outside of the range of 0 to 127, it is undefined behavior.
• When < would push the cell pointer below zero, the cell pointer wraps around to cell 255. Likewise, if > would push the cell pointer above 255, the cell pointer wraps around to zero.
• When the parameter queue is empty and a command requires a value from the queue, the value is received from input.
• If there is division by zero, the behavior is undefined.

Examples

Hello, world!

This program prints the message “Hello, World!” to the standard output:

]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]],~
]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]],~
]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]],~
]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]],~
]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]],~
]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]],~
]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]],~
]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]],~
]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]],~
]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]],~
]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]],~
]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]],~
]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]],

Cat program

The following program implements a repeating cat program for numeric input and output, which terminates upon a user input equal to zero:

]{&.}

Truth-machine

A truth-machine is implemented in the following program:

&.{.}

Interpreter

• Common Lisp implementation of the NullScript 2 programming language.