Execute Brain****/Elena: Difference between revisions
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#import extensions'scripting.
▲#class BFTape
{
[
theArray := Array new:aLength set &every: (&int:n) [ Integer new:0 ].
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]
[
(theArray@thePointer) += 1.
]
[
(theArray@thePointer) -= 1.
]
[
thePointer += 1.
]
[
thePointer -= 1.
]
[
theBrackets push:bookmark.
]
=> theBrackets.
[
theArray@thePointer := console readChar toInt.
]
[
console write:((theArray@thePointer) toChar).
]
}
[
console
writeLine:"++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<<+++++++++++++++.>.+++.------.--------.>+.>.".
load &path:"rules.es"
eval:"++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<<+++++++++++++++.>.+++.------.--------.>+.>.".
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The grammar:
<lang elena>[[
[[
#grammar transform
#grammar cf
#define start ::= <=
#define commands ::= command commands;
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#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 command ::= <= += " 0" += " %""system'dynamic'tapeOp.stack&args$[]"" " += " %""check[0]"" " += " 1" += "
▲
#define comment ::= " " comments;
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#mode symbolic;
]]
]]</lang>
|
Revision as of 20:01, 24 March 2017
<lang elena>#import system.
- import system'collections.
- import system'routines.
- import system'dynamic.
- import extensions.
- import extensions'scripting.
class BFTape {
object theArray. object thePointer. object theBrackets.
constructor new:aLength [ theArray := Array new:aLength set &every: (&int:n) [ Integer new:0 ]. thePointer := Integer new:0. theBrackets := Stack new. ]
append [ (theArray@thePointer) += 1. ] reduce [ (theArray@thePointer) -= 1. ] next [ thePointer += 1. ]
previous [ thePointer -= 1. ] push : bookmark [ theBrackets push:bookmark. ] pop => theBrackets. input [ theArray@thePointer := console readChar toInt. ] output [ console write:((theArray@thePointer) toChar). ]
check = theArray@thePointer != 0.
}
program = [
console writeLine:"++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<<+++++++++++++++.>.+++.------.--------.>+.>.". var program := scriptEngine load &path:"rules.es" eval:"++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<<+++++++++++++++.>.+++.------.--------.>+.>.".
program eval:(BFTape new:1024).
].</lang> The grammar: <lang elena>[[ [[
#grammar transform #grammar cf
#define start ::= <= ( > += " 2" += " %""system'dynamic'tapeOp.var&args$[]""" => 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>