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brainfuck: Adding debug (#) operator.

db4
John Benediktsson 2009-06-07 16:18:13 -07:00
parent 6b86f059e7
commit 4b21217956
1 changed files with 8 additions and 2 deletions
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10
extra/brainfuck/brainfuck.factor
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@ -2,7 +2,7 @@
! See http://factorcode.org/license.txt for BSD license
USING: accessors assocs fry io io.streams.string kernel macros math
peg.ebnf quotations sequences strings ;
peg.ebnf prettyprint quotations sequences strings ;
IN: brainfuck
@ -40,6 +40,11 @@ TUPLE: brainfuck pointer memory ;
: (<) ( brainfuck n -- brainfuck )
[ dup pointer>> ] dip - >>pointer ;
: (#) ( brainfuck -- brainfuck )
dup
[ "ptr=" write pointer>> pprint ]
[ ",mem=" write memory>> pprint nl ] bi ;
: compose-all ( seq -- quot )
[ ] [ compose ] reduce ;
@ -51,10 +56,11 @@ inc-mem = ("+")+ => [[ length 1quotation [ (+) ] append ]]
dec-mem = ("-")+ => [[ length 1quotation [ (-) ] append ]]
output = "." => [[ [ (.) ] ]]
input = "," => [[ [ (,) ] ]]
debug = "#" => [[ [ (#) ] ]]
space = (" "|"\t"|"\r\n"|"\n")+ => [[ [ ] ]]
unknown = (.) => [[ "Invalid input" throw ]]
ops = inc-ptr | dec-ptr | inc-mem | dec-mem | output | input | space
ops = inc-ptr|dec-ptr|inc-mem|dec-mem|output|input|debug|space
loop = "[" {loop|ops}* "]" => [[ second compose-all 1quotation [ [ (?) ] ] prepend [ while ] append ]]
code = (loop|ops|unknown)* => [[ compose-all ]]