Execute Brain****/Standard ML: Difference between revisions
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Fixed syntax highlighting.
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{{implementation|Brainf***}}{{collection|RCBF}}
Quick implementation of a [[Brainfuck]] interpreter in [[Standard ML]].
Like the [[Haskell]] [[RCBF/Haskell|version]] but without the lazy lists:
Pairs of lists are used to implement both the two-side infinite band of cells, and the program storage.
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A more efficient implementation could for example only admit well-bracketed brainfuck programs, and parse bracket blocks first, to replace the ''matchLeft'' and ''matchRight'' which need linear time.
<
fun moveRight (l, x::r) = (x::l, r)
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| exec (p as (_, #"]"::_), d ) = exec (matchLeft (moveLeft p), d)
fun run s = exec (([], s), ([0], [0]))</syntaxhighlight>
Example output:
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