94 lines
2.3 KiB
Factor
94 lines
2.3 KiB
Factor
! Copyright (C) 2009 John Benediktsson
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! See http://factorcode.org/license.txt for BSD license
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USING: accessors assocs command-line fry io io.encodings.binary
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io.files io.streams.string kernel macros math namespaces
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peg.ebnf prettyprint sequences ;
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IN: brainfuck
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<PRIVATE
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TUPLE: brainfuck pointer memory ;
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: <brainfuck> ( -- brainfuck )
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0 H{ } clone brainfuck boa ;
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: get-memory ( brainfuck -- brainfuck value )
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dup [ pointer>> ] [ memory>> ] bi at 0 or ;
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: set-memory ( brainfuck value -- brainfuck )
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over [ pointer>> ] [ memory>> ] bi set-at ;
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: (+) ( brainfuck n -- brainfuck )
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[ get-memory ] dip + 255 bitand set-memory ;
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: (-) ( brainfuck n -- brainfuck )
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[ get-memory ] dip - 255 bitand set-memory ;
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: (?) ( brainfuck -- brainfuck t/f )
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get-memory zero? not ;
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: (.) ( brainfuck -- brainfuck )
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get-memory write1 ;
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: (,) ( brainfuck -- brainfuck )
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read1 set-memory ;
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: (>) ( brainfuck n -- brainfuck )
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'[ _ + ] change-pointer ;
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: (<) ( brainfuck n -- brainfuck )
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'[ _ - ] change-pointer ;
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: (#) ( brainfuck -- brainfuck )
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dup
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[ "ptr=" write pointer>> pprint ]
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[ ",mem=" write memory>> pprint nl ] bi ;
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: compose-all ( seq -- quot )
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[ ] [ compose ] reduce ;
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EBNF: parse-brainfuck
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inc-ptr = (">")+ => [[ length '[ _ (>) ] ]]
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dec-ptr = ("<")+ => [[ length '[ _ (<) ] ]]
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inc-mem = ("+")+ => [[ length '[ _ (+) ] ]]
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dec-mem = ("-")+ => [[ length '[ _ (-) ] ]]
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output = "." => [[ [ (.) ] ]]
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input = "," => [[ [ (,) ] ]]
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debug = "#" => [[ [ (#) ] ]]
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space = [ \t\n\r]+ => [[ [ ] ]]
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unknown = (.) => [[ "Invalid input" throw ]]
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ops = inc-ptr|dec-ptr|inc-mem|dec-mem|output|input|debug|space
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loop = "[" {loop|ops}+ "]" => [[ second compose-all '[ [ (?) ] _ while ] ]]
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code = (loop|ops|unknown)* => [[ compose-all ]]
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;EBNF
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PRIVATE>
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MACRO: run-brainfuck ( code -- quot )
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parse-brainfuck '[ <brainfuck> @ drop flush ] ;
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: get-brainfuck ( code -- result )
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[ run-brainfuck ] with-string-writer ; inline
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<PRIVATE
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: (run-brainfuck) ( code -- )
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[ <brainfuck> ] dip parse-brainfuck call( x -- x ) drop flush ;
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PRIVATE>
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: brainfuck-main ( -- )
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command-line get [
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contents (run-brainfuck)
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] [
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[ binary file-contents (run-brainfuck) ] each
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] if-empty ;
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MAIN: brainfuck-main
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