! Copyright (C) 2009 John Benediktsson
! See http://factorcode.org/license.txt for BSD license
-USING: accessors assocs fry io io.streams.string kernel macros math peg.ebnf sequences strings ;
+USING: accessors assocs command-line io io.encodings.binary
+io.files io.streams.string kernel macros math namespaces
+peg.ebnf prettyprint sequences multiline ;
IN: brainfuck
<PRIVATE
-TUPLE: brainfuck ptr mem ops ;
+TUPLE: brainfuck pointer memory ;
-: <brainfuck> ( -- brainfuck )
- 0 H{ } clone 0 brainfuck boa ;
+: <brainfuck> ( -- brainfuck )
+ 0 H{ } clone brainfuck boa ;
-: ops? ( brainfuck -- brainfuck )
- [ 1 + ] change-ops
- dup ops>> 10000 > [ "Max operations" throw ] when ;
+: get-memory ( brainfuck -- brainfuck value )
+ dup [ pointer>> ] [ memory>> ] bi at 0 or ;
-: (get-mem) ( brainfuck -- brainfuck value )
- dup [ ptr>> ] [ mem>> ] bi at 0 or ;
+: set-memory ( brainfuck value -- brainfuck )
+ over [ pointer>> ] [ memory>> ] bi set-at ;
-: (set-mem) ( brainfuck value -- brainfuck )
- over [ ptr>> ] [ mem>> ] bi set-at ;
+: (+) ( brainfuck n -- brainfuck )
+ [ get-memory ] dip + 255 bitand set-memory ;
-: mem++ ( brainfuck -- brainfuck )
- (get-mem) 1 + 255 bitand (set-mem) ops? ;
+: (-) ( brainfuck n -- brainfuck )
+ [ get-memory ] dip - 255 bitand set-memory ;
-: mem-- ( brainfuck -- brainfuck )
- (get-mem) 1 - 255 bitand (set-mem) ops? ;
+: (.) ( brainfuck -- brainfuck )
+ get-memory write1 ;
-: mem? ( brainfuck -- brainfuck t/f )
- ops? (get-mem) 0 = not ;
+: (,) ( brainfuck -- brainfuck )
+ read1 set-memory ;
-: out ( brainfuck -- brainfuck )
- (get-mem) 1string write ops? ;
+: (>) ( brainfuck n -- brainfuck )
+ '[ _ + ] change-pointer ;
-: in ( brainfuck -- brainfuck )
- read1 (set-mem) ops? ;
+: (<) ( brainfuck n -- brainfuck )
+ '[ _ - ] change-pointer ;
-: ptr++ ( brainfuck -- brainfuck )
- [ 1 + ] change-ptr ops? ;
+: (#) ( brainfuck -- brainfuck )
+ dup
+ [ "ptr=" write pointer>> pprint ]
+ [ ",mem=" write memory>> pprint nl ] bi ;
-: ptr-- ( brainfuck -- brainfuck )
- [ 1 - ] change-ptr ops? ;
-
-: compose-all ( seq -- quot )
+: compose-all ( seq -- quot )
[ ] [ compose ] reduce ;
-EBNF: parse-brainfuck
+EBNF: parse-brainfuck [=[
-inc-ptr = ">" => [[ [ ptr++ ] ]]
-dec-ptr = "<" => [[ [ ptr-- ] ]]
-inc-mem = "+" => [[ [ mem++ ] ]]
-dec-mem = "-" => [[ [ mem-- ] ]]
-output = "." => [[ [ out ] ]]
-input = "," => [[ [ in ] ]]
-space = (" "|"\t"|"\r\n"|"\n") => [[ [ ] ]]
+inc-ptr = (">")+ => [[ length '[ _ (>) ] ]]
+dec-ptr = ("<")+ => [[ length '[ _ (<) ] ]]
+inc-mem = ("+")+ => [[ length '[ _ (+) ] ]]
+dec-mem = ("-")+ => [[ length '[ _ (-) ] ]]
+output = "." => [[ [ (.) ] ]]
+input = "," => [[ [ (,) ] ]]
+debug = "#" => [[ [ (#) ] ]]
+space = [ \t\n\r]+ => [[ [ ] ]]
unknown = (.) => [[ "Invalid input" throw ]]
-ops = inc-ptr | dec-ptr | inc-mem | dec-mem | output | input | space
-loop = "[" {loop|ops}* "]" => [[ second compose-all '[ [ mem? ] _ while ] ]]
+ops = inc-ptr|dec-ptr|inc-mem|dec-mem|output|input|debug|space
+loop = "[" {loop|ops}+ "]" => [[ second compose-all '[ [ get-memory zero? ] _ until ] ]]
code = (loop|ops|unknown)* => [[ compose-all ]]
-;EBNF
+]=]
PRIVATE>
-MACRO: run-brainfuck ( code -- )
- [ <brainfuck> ] swap parse-brainfuck [ drop ] 3append ;
+MACRO: run-brainfuck ( code -- quot )
+ parse-brainfuck '[ <brainfuck> @ drop flush ] ;
+
+: get-brainfuck ( code -- result )
+ [ run-brainfuck ] with-string-writer ; inline
+
+<PRIVATE
+
+: (run-brainfuck) ( code -- )
+ [ <brainfuck> ] dip parse-brainfuck call( x -- x ) drop flush ;
+
+PRIVATE>
-: get-brainfuck ( code -- result )
- [ run-brainfuck ] with-string-writer ; inline
+: brainfuck-main ( -- )
+ command-line get [
+ read-contents (run-brainfuck)
+ ] [
+ [ binary file-contents (run-brainfuck) ] each
+ ] if-empty ;
+MAIN: brainfuck-main