CSL

Command Stack Language (CSL for short, CSLAAI2D* for long) is a 2D, stack-based programming language by User:Actuallyallama.

The language features two stacks - one for actual memory, one for instructions.

The instruction pointer works as it does in many languages. It is manipulated by directional commands, and will wrap around.

The difference in this language, is rather than immediately executing instructions, it instead adds the instruction to the top of the instruction stack and executes it when at a special execution instruction. Since it's a stack, all of the instructions will execute in reverse order to the order they are added.

Commands

Command	Name	Description
!	EOF	Terminate program.
e	EXC	Execute the command on top of the stack.
E	EX2	Execute all commands on the stack.
v	MDN	Switches instruction direction
<	MLT	Switches instruction direction
>	MRT	Switches instruction direction
^	MUP	Switches instruction direction
{	CLF	If pop == 0, move left. Else, keep direction.
}	CRF	If pop != 0, move right. Else, keep direction.
1	ONE	Push a 1 onto the stack.
D	DUP	Duplicate the top of the stack.
P	PRT	Pop the top of the stack and print it.
p	PRA	Pop the top of the stack and print it as ASCII character.
N	PRN	Print a line terminator.
+	INC	Pop the top, increment it by 1, push it.
-	DEC	Pop the top, decrement it by 1, push it.
&	ADD	Pop the top two items, add them. Push result.
*	MUL	Pop the top two items, multiply them. Push result.
_	SUB	Pop the top two items, subtract them. Push result.
~	SWT	Switch the top two items.
|	NUL	Pop the top item, and discard it.
$	BRK	Break out of mass execution (E).
?	CEX	If pop == 0, pop the top command and invoke. Else pop top command and discard.

Examples

Hello World:

   p&1*+1*+++1+++1p_~+++++++1pD_~+++++1pD&++1pD&*+++1+++++1pD&*++1++++1pp&&D+++++1D*+1*D+++1|p&++1pDpD&++++++1pD&+++1&*++++1++++1DDpD*+1*D+++++1E!

provides the following output:

   Hello, World!

Implementations

The file extension for code it runs is ".csl"

Interpreter in C#

Footnotes

• Stands for "Command Stack Language (And Also In 2 Dimensions)"