factor: trim using lists

[factor.git] / extra / brainfuck / brainfuck.factor

diff --git a/extra/brainfuck/brainfuck.factor b/extra/brainfuck/brainfuck.factor
index 859bcc28629faeaced1b637c6979c468674c4b3b..045cf03c1269e0a1546c7b8ce0c9c2616d988b98 100644 (file)
--- a/extra/brainfuck/brainfuck.factor
+++ b/extra/brainfuck/brainfuck.factor
@@ -1,8 +1,9 @@
 ! 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 prettyprint 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
 
@@ -25,20 +26,17 @@ TUPLE: brainfuck pointer memory ;
 : (-) ( brainfuck n -- brainfuck )
     [ get-memory ] dip - 255 bitand set-memory ;
 
-: (?) ( brainfuck -- brainfuck t/f )
-    get-memory 0 = not ;
-
 : (.) ( brainfuck -- brainfuck )
-    get-memory 1string write ;
+    get-memory write1 ;
 
 : (,) ( brainfuck -- brainfuck )
     read1 set-memory ;
 
 : (>) ( brainfuck n -- brainfuck )
-    [ dup pointer>> ] dip + >>pointer ;
+    '[ _ + ] change-pointer ;
 
 : (<) ( brainfuck n -- brainfuck )
-    [ dup pointer>> ] dip - >>pointer ;
+    '[ _ - ] change-pointer ;
 
 : (#) ( brainfuck -- brainfuck )
     dup
@@ -48,30 +46,45 @@ TUPLE: brainfuck pointer memory ;
 : compose-all ( seq -- quot )
     [ ] [ compose ] reduce ;
 
-EBNF: parse-brainfuck
+EBNF: parse-brainfuck [=[
 
-inc-ptr  = (">")+  => [[ length [ (>) ] curry ]]
-dec-ptr  = ("<")+  => [[ length [ (<) ] curry ]]
-inc-mem  = ("+")+  => [[ length [ (+) ] curry ]]
-dec-mem  = ("-")+  => [[ length [ (-) ] curry ]]
+inc-ptr  = (">")+  => [[ length '[ _ (>) ] ]]
+dec-ptr  = ("<")+  => [[ length '[ _ (<) ] ]]
+inc-mem  = ("+")+  => [[ length '[ _ (+) ] ]]
+dec-mem  = ("-")+  => [[ length '[ _ (-) ] ]]
 output   = "."  => [[ [ (.) ] ]]
 input    = ","  => [[ [ (,) ] ]]
 debug    = "#"  => [[ [ (#) ] ]]
-space    = (" "|"\t"|"\r\n"|"\n")+ => [[ [ ] ]]
+space    = [ \t\n\r]+ => [[ [ ] ]]
 unknown  = (.)  => [[ "Invalid input" throw ]]
 
 ops   = inc-ptr|dec-ptr|inc-mem|dec-mem|output|input|debug|space
-loop  = "[" {loop|ops}+ "]" => [[ second compose-all [ while ] curry [ (?) ] prefix ]]
+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 flush ] 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>
+
+: brainfuck-main ( -- )
+    command-line get [
+        read-contents (run-brainfuck)
+    ] [
+        [ binary file-contents (run-brainfuck) ] each
+    ] if-empty ;
+
+MAIN: brainfuck-main