Changed brainfuck from interpreter to compiler, using EBNF's.
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@ -1,93 +1,74 @@
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! 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 combinators io io.streams.string kernel math
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namespaces sequences strings ;
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USING: accessors assocs fry io io.streams.string kernel macros math peg.ebnf sequences strings ;
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IN: brainfuck
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<PRIVATE
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TUPLE: brainfuck code cp dp steps memory loop ;
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TUPLE: brainfuck ptr mem ops ;
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: (set-loop) ( brainfuck in out -- brainfuck )
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pick loop>> [ set-at ] [ [ swap ] dip set-at ] 3bi ;
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: <brainfuck> ( -- brainfuck )
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0 H{ } clone 0 brainfuck boa ;
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SYMBOL: tmp
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: ops? ( brainfuck -- brainfuck )
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[ 1 + ] change-ops
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dup ops>> 10000 > [ "Max operations" throw ] when ;
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: <brainfuck> ( code -- brainfuck )
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0 0 0 H{ } clone H{ } clone brainfuck boa
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V{ } clone tmp set
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dup code>> <enum> [
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{
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{ CHAR: [ [ tmp get push ] }
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{ CHAR: ] [ tmp get pop (set-loop) ] }
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[ 2drop ]
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} case
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] assoc-each ;
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: (get-mem) ( brainfuck -- brainfuck value )
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dup [ ptr>> ] [ mem>> ] bi at 0 or ;
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: (set-mem) ( brainfuck value -- brainfuck )
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over [ ptr>> ] [ mem>> ] bi set-at ;
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: (get-memory) ( brainfuck -- brainfuck value )
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dup [ dp>> ] [ memory>> ] bi at 0 or ;
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: mem++ ( brainfuck -- brainfuck )
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(get-mem) 1 + 255 bitand (set-mem) ops? ;
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: (set-memory) ( intepreter value -- brainfuck )
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over [ dp>> ] [ memory>> ] bi set-at ;
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: mem-- ( brainfuck -- brainfuck )
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(get-mem) 1 - 255 bitand (set-mem) ops? ;
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: (inc-memory) ( brainfuck -- brainfuck )
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(get-memory) 1 + 255 bitand (set-memory) ;
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: mem? ( brainfuck -- brainfuck t/f )
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ops? (get-mem) 0 = not ;
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: (dec-memory) ( brainfuck -- brainfuck )
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(get-memory) 1 - 255 bitand (set-memory) ;
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: out ( brainfuck -- brainfuck )
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(get-mem) 1string write ops? ;
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: (out-memory) ( brainfuck -- brainfuck )
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(get-memory) 1string write ;
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: in ( brainfuck -- brainfuck )
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read1 (set-mem) ops? ;
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: ptr++ ( brainfuck -- brainfuck )
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[ 1 + ] change-ptr ops? ;
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: (inc-data) ( brainfuck -- brainfuck )
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[ 1 + ] change-dp ;
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: ptr-- ( brainfuck -- brainfuck )
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[ 1 - ] change-ptr ops? ;
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: (dec-data) ( brainfuck -- brainfuck )
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[ 1 - ] change-dp ;
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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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: (loop-start) ( brainfuck -- brainfuck )
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(get-memory) 0 = [ dup [ cp>> ] [ loop>> ] bi at >>cp ] when ;
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inc-ptr = ">" => [[ [ ptr++ ] ]]
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dec-ptr = "<" => [[ [ ptr-- ] ]]
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inc-mem = "+" => [[ [ mem++ ] ]]
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dec-mem = "-" => [[ [ mem-- ] ]]
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output = "." => [[ [ out ] ]]
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input = "," => [[ [ in ] ]]
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space = (" "|"\t"|"\r\n"|"\n") => [[ [ ] ]]
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unknown = (.) => [[ "Invalid input" throw ]]
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: (loop-end) ( brainfuck -- brainfuck )
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dup [ cp>> ] [ loop>> ] bi at 1 - >>cp ;
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ops = inc-ptr | dec-ptr | inc-mem | dec-mem | output | input | space
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loop = "[" {loop|ops}* "]" => [[ second compose-all '[ [ mem? ] _ while ] ]]
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code = (loop|ops|unknown)* => [[ compose-all ]]
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: (get-input) ( brainfuck -- brainfuck )
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read1 (set-memory) ;
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: can-step ( brainfuck -- brainfuck t/f )
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dup [ steps>> 100000 < ] [ cp>> ] [ code>> length ] tri < and ;
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: step ( brainfuck -- brainfuck )
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dup [ cp>> ] [ code>> ] bi nth
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{
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{ CHAR: > [ (inc-data) ] }
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{ CHAR: < [ (dec-data) ] }
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{ CHAR: + [ (inc-memory) ] }
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{ CHAR: - [ (dec-memory) ] }
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{ CHAR: . [ (out-memory) ] }
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{ CHAR: , [ (get-input) ] }
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{ CHAR: [ [ (loop-start) ] }
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{ CHAR: ] [ (loop-end) ] }
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{ CHAR: \s [ ] }
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{ CHAR: \t [ ] }
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{ CHAR: \r [ ] }
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{ CHAR: \n [ ] }
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[ "invalid input" throw ]
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} case [ 1 + ] change-cp [ 1 + ] change-steps ;
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;EBNF
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PRIVATE>
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: run-brainfuck ( code -- )
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<brainfuck> [ can-step ] [ step ] while drop ;
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: get-brainfuck ( code -- result )
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[ run-brainfuck ] with-string-writer ;
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MACRO: run-brainfuck ( code -- )
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[ <brainfuck> ] swap parse-brainfuck [ drop ] 3append ;
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: get-brainfuck ( code -- result )
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[ run-brainfuck ] with-string-writer ; inline
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