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<lang elena>#import system'collections.
#import system'routines.
#import system'dynamic.
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Revision as of 20:02, 24 March 2017
<lang elena>#import system'collections.
- import system'routines.
- import system'dynamic.
- import extensions.
- import extensions'scripting.
class BFTape {
object theArray. object thePointer. object theBrackets.
constructor new:aLength [ theArray := Array new:aLength set &every: (&int:n) [ Integer new:0 ]. thePointer := Integer new:0. theBrackets := Stack new. ]
append [ (theArray@thePointer) += 1. ] reduce [ (theArray@thePointer) -= 1. ] next [ thePointer += 1. ]
previous [ thePointer -= 1. ] push : bookmark [ theBrackets push:bookmark. ] pop => theBrackets. input [ theArray@thePointer := console readChar toInt. ] output [ console write:((theArray@thePointer) toChar). ]
check = theArray@thePointer != 0.
}
program = [
console writeLine:"++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<<+++++++++++++++.>.+++.------.--------.>+.>.". var program := scriptEngine load &path:"rules.es" eval:"++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<<+++++++++++++++.>.+++.------.--------.>+.>.".
program eval:(BFTape new:1024).
].</lang> The grammar: <lang elena>[[ [[
#grammar transform #grammar cf
#define start ::= <= ( > += " 2" += " %""system'dynamic'tapeOp.var&args$[]""" => commands <= " *" "system'dynamic'Tape" "=" == ) =>;
#define commands ::= command commands; #define commands ::= comment commands; #define commands ::= $eof;
#define command ::= <= += " %""output[0]"" " => "."; #define command ::= <= += " %""input[0]"" " => ","; #define command ::= <= += " %""previous[0]"" " => "<"; #define command ::= <= += " %""next[0]"" " => ">"; #define command ::= <= += " %""append[0]"" " => "+"; #define command ::= <= += " %""reduce[0]"" " => "-"; #define command ::= <= += " -2" += " %""system'dynamic'tapeOp.ptr&args$[]"" " += " 1" += " %""system'dynamic'tapeOp.stack&args$[]"" " += "%""push[1]"" " => "["; #define command ::= <= += " 0" += " %""system'dynamic'tapeOp.stack&args$[]"" " += " %""check[0]"" " += " 1" += " %""system'dynamic'tapeOp.stack&args$[]"" " += " %""pop[0]"" " += " %""system'dynamic'tapeOp.jumpif&args$[13]"" " => "]";
#define comment ::= " " comments; #define comment ::= "'" comments; #define comment ::= "!" comments; #define comment ::= $eol;
#define comments ::= $chr comments; #define comments ::= $eps;
#mode symbolic;
]]
]]</lang>