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Comments on Write a Deadfish Interpreter

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Write a Deadfish Interpreter

+6
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A rewrite of this SE question with a simpler input format and guidelines.

Challenge

Deadfish uses a single accumulator, on which all commands are to be performed.

It has the following commands:

Command Description
i increment the accumulator
d decrement the accumulator
s square the value of the accumulator
o output the value of the accumulator as a number

If, after executing a command, the accumulator is equal to -1 or equal to 256, the accumulator must be reset to zero.

I/O

Input can be taken as a single string, list of codepoints, or any other reasonable format. It is guaranteed that the input will only consist of deadfish commands.

Output can be given as an array of numbers, or just the numbers printed with separators between them.

Testcases

(some are borrowed from the Esolangs wiki)

iissso -> 0
diissisdo -> 288
iissisdddddddddddddddddddddddddddddddddo -> 0
isssoisoisoisoiso -> 1,4,25,676,458329
ooooosioiiisooo -> 0,0,0,0,0,1,16,16,16
iiii -> nothing
iiiiiiiissdiiiiiiiiiiiiiiiiio -> 4112
o -> 0
code-golf interpreter
posted almost 4 years ago
3y ago
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+2
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Lua 5.4.4, 99 bytes

_=0s:gsub('.',function(c)_=({d=_-1,i=_+1;s=_*_})[c]or print(_)or _ _=({[256]=0,[-1]=0})[_]or _ end)

Try it online!

Thanks to @orthoplex for more shortening.

posted over 2 years ago
2y ago
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Zakk‭
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1 comment thread

Tables to the rescue ^^ ```lua _=0 for c in s:gmatch'.'do _=({d=_-1,i=_+1;s=_*_})[c]or print(_)or... (4 comments)
Tables to the rescue ^^ ```lua _=0 for c in s:gmatch'.'do _=({d=_-1,i=_+1;s=_*_})[c]or print(_)or...
orthoplex‭ wrote over 2 years ago
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Tables to the rescue ^^

_=0
for c in s:gmatch'.'do
_=({d=_-1,i=_+1;s=_*_})[c]or print(_)or _
_=({[256]=0,[-1]=0})[_]or _
end
orthoplex‭ wrote over 2 years ago
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At first, I thought you were cheesing the test cases, but you're right, -1 is the only negative number you can possibly get. Clever! The penultimate line should then be

_=(_==256or _<0)and 0or _
Zakk‭ wrote over 2 years ago · edited over 2 years ago
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_=(_==256or _<0)and 0or _

You are right.

Tables to the rescue ^^

Man! That's just brilliant! Again, thanks for pointing this out.

Btw, I am really curious about how much experience you have with Lua.

Zakk‭ wrote over 2 years ago
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Though both of s:gsub and for..in versions are equal in length, the former can be one byte shorter, because sticking an s to 0 doesn't make the Lua interpreter unhappy, contrary to sticking an f to 0.

_=0s:gsub('.',function(c)_=({d=_-1,i=_+1;s=_*_})[c]or print(_)or _ _=({[256]=0,[-1]=0})[_]or _ end)