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Rip -- a stack-based rip language
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All stack items are integers, of unspecified but constant size
0-9: push value
p: pop
s: swap
D: duplicate
i: increment
d: decrement
r: pops the number of items to rotate clockwise
+ - * /: just what you expect
> < =: comparisons; booleans are 1 and 0, as you expect
[ ... ]: syntactical; a codeblock
I: pops boolean, conditionally executing the codeblock that should follow the I, depending on the boolean (aka "if")
W: I, but then "while" instead of "if"
o: outputs the top value as an ascii char
O: outputs the top value as a number
whitespace: nop
Any error causes the interpreter to exit, saying "rip".
Example code
------------
Fibonacci:
01
1W[
DO
9io
D3r+
1]
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