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-( Pure Data Packet - ca rules library. )
-( Copyright (c) by Tom Schouten <pdp@zzz.kotnet.org> )
-( )
-( This program is free software; you can redistribute it and/or modify )
-( it under the terms of the GNU General Public License as published by )
-( the Free Software Foundation; either version 2 of the License, or )
-( [at your option] any later version. )
-( )
-( This program is distributed in the hope that it will be useful, )
-( but WITHOUT ANY WARRANTY; without even the implied warranty of )
-( MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the )
-( GNU General Public License for more details. )
-( )
-( You should have received a copy of the GNU General Public License )
-( along with this program; if not, write to the Free Software )
-( Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. )
-
-
-
-( this is the standard ca rules library )
-( a rule that is accessible from the ouside should start with "rule_" )
-( and has to return exactly one item on the stack (this is checked in pdp_ca) )
-
-
-( a word is a sequence of non whitespace characters (\S+) )
-( words are separated by whitespace (\s+) )
-( so "word ;" is not the same as "word;" )
-
-( all words between the "(" word and the ")" word are ignored )
-
-( ":" starts a definition, the next word is the name of the new word )
-( newline ends a definition )
-
-( no more than one definition per line )
-( no more than one line per definition )
-
-( ";" returns to calling word )
-( if no ";" is encountered the next defined word is executed )
-( this is to have multiple entry points )
-( multiple exit points don't make sense since there are no conditional words )
-
-
-
-: +(4) ++++ ; ( 4 bit add TOS - carry on TOS )
-: +(3) +++ ; ( 3 bit add TOS - carry on TOS )
-: +(2) ++ ; ( 2 bit add TOS - carry on TOS )
-
-: +top @-+ +(4) drop @0+ +(4) drop @++ +(4) ; ( add top row to reg - carry on TOS )
-: +mid @-0 +(4) drop @00 +(4) drop @+0 +(4) ; ( add mid row to reg - carry on TOS )
-: +bot @-- +(4) drop @0- +(4) drop @+- +(4) ; ( add bot row to reg - carry on TOS )
-: +all +top drop +mid drop +bot ; ( add all cells to reg - carry on TOS )
-
-: +mid-1 @-0 +(4) drop @+0 +(4) ; ( add mid row except center element to reg - carry on TOS )
-: +all-1 +top drop +mid-1 drop +bot ; ( add all cells expet middle one to reg - carry on TOS )
-
-
-: countall a-0 +all drop ; ( count all cells - no stack effect )
-: countall-1 a-0 +all-1 drop ; ( count all cells except middle one - no stack effect )
-
-: +topbot @0+ +(3) drop @0- +(3) ;
-: +leftright @+0 +(3) drop @-0 +(3) ;
-: +star +topbot drop +leftright ;
-: countstar a-0 +star drop ;
-
-: =2or3? @a2 not @a1 and ; ( sum equal to 2 or 3? only checks 3 bits )
-: =3? =2or3? @a0 and ; ( sum equal to 3 ? )
-: =2? =2or3? @a0 not and ; ( sum equal to 2 ? )
-: =4? @a2 @a1 not and @a0 not and ; ( sum equal to 4 ? )
-
-
-
-( some test rules )
-
-( : rule_one 1 ; )
-( : rule_zero 0 ; )
-( : rule_id @00 ; )
-
-
-: rule_shiftleft @+0 ;
-: rule_shifttop @0- ;
-: rule_shiftbot @0+ ;
-: rule_shifttopright @-- ;
-: rule_strobe @00 not ;
-
-( game of life )
-
-: rule_gameoflife countall-1 =2? @00 and =3? or ;
-
-( wolfram's rule 110)
-
-: rule_w110 @00 @+0 and not @-0 @00 @+0 or or and ;
-
-
-( some other rules )
-
-: rule_w110mod @0+ @+0 and not @-+ @0+ @++ or or and ;
-
-: rule_w110mod2 @0+ @+0 and not @-+ @0+ @+0 or or and ;
-: rule_w110mod3 @0+ @++ and not @-+ @0+ @++ or or and @-0 @00 @+0 or or and ;
-
-: rule_golmod countall-1 =3? @00 and =2? or ;
-: rule_golmod2 countall-1 =2? @0+ and =3? or ;
-: rule_golmod3 countall-1 =2? @++ and =3? or ;
-: rule_golmod4 countall-1 =2? @++ @-- or and =3? or ;
-: rule_golmod5 countall-1 =2? @++ @-- or and =3? @+- and or ;
-: rule_golmod6 countall-1 =2? @++ @-- or and =3? @+- and or @0+ or ;
-: rule_golmod7 countall-1 =2? @++ @-- or and =3? @+- and or @0+ or @00 and ;
-
-( ca's with a short settling time )
-
-: rule_block countstar =4? not =2? and @00 or ;
-: rule_noiseedges countstar =4? =3? or not =2? and @00 or @++ xor ;
-: rule_noiseplanes countstar =4? =3? or not =2? and @00 or @++ xor @-- xor ;
-
-
-( : rule_noiseplanes countstar =4? =3? or not =2? and @00 or @++ xor @-- xor ; )
-