182 letters - forked from: BrainF*ck interpreter challenge

/**
 * Copyright shohei909 ( http://wonderfl.net/user/shohei909 )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/nTie
 */

// forked from h013's 188 letters - forked from: BrainF*ck interpreter challenge
// forked from keim_at_Si's 192 letters - forked from: BrainF*ck interpreter challenge
// forked from keim_at_Si's BrainF*ck interpreter challenge
package {
    import flash.events.*;
    import flash.display.*;
    import com.bit101.components.*;
    
    public class BFInterpreter extends Sprite {
        
        
        
        
// my current brainf*ck interpreter (182 letters)----------------------------------------------------------------------------------------------------
//function $(b,i){with(i){for(s=[n=j=p=k=0],o=[];c=b[k<0?--p:p++];)k?k-=c>>6&&c-92:c<60?c&1?s[j]+=44-c:c&2?o.push(s[j]):s[j]=shift()||(p=b):c&1?p+=k=c&4?-1:!s[j]:s[j+=c-61]^=0;return o}}

// b : sourceChars
// i : inputChars
// c : command
// j : pointer //(x,y,zは最初から0が代入されている,がこれらをつかうと画面が動くため変更した)
// p : position
// o : output
// k : "[" counter 

function $(b,i){
    //withをつかうことで変数宣言が必要なくなる
    with(i){
         for(s=[j=p=k=0],o=[];c=b[k<0?--p:p++];)
             k ? //カッコ内を移動しているときの処理 
                 k-=c>>6&&c-92 
             :
                 c<60?
                     c&1? //2進数表現の下一桁で分岐
                         // 43 = 101011(2) 
                         // 45 = 101101(2)
                         // "+"(43),"-"(45) の処理
                         s[j]+=44-c
                     :
                         c&2? //2進数表現の下から2桁目で分岐
                             // 46 = 101110(2) 
                             // "."(46) の処理
                             o.push(s[j])
                         :
                             // 44 = 101100(2) 
                             // ","(44) の処理  i.shift()==null なら終了
                             s[j] = shift() || (p=b)
                 :
                     c&1? //2進数表現の下一桁で分岐
                         // 91 = 1011011(2) 
                         // 93 = 1011101(2) 
                         
                         // "["(91),"]"(93) の処理
                         // "["のとき s[j] != null なら k = 1
                         // "]"のとき k = -1
                         p += k= c&4 ? -1 : !s[j]
                     :
                         // 60 = 111100(2) 
                         // 62 = 111110(2) 
                         // "<"(60),">"(62) の処理
                         s[ j+=c-61 ]^=0
         ;return o
    }
}
//*/

// User Interface ----------------------------------------------------------------------------------------------------
        function BFInterpreter() { addEventListener(Event.ADDED_TO_STAGE, _setup); }
        
        private function _setup(event:Event) : void {
            event.target.removeEventListener(event.type, arguments.callee);
            _source = _newTextArea("source :", 20,  200);
            _input  = _newTextArea("input :",  240, 18);
            _output = _newTextArea("output :", 280, 160);
            new PushButton(this, 132, 221, "execute", _execute).setSize(200, 18);
            
            // Hello, world! (72, 101, 108, 108, 111, 44, 32, 119, 111, 114, 108, 100, 33)
            _source.text = "+++++++++[>++++++++>+++++++++++>+++++<<<-]>.>++.+++++++..+++.>-.------------.<++++++++.--------.+++.------.--------.>+.";
        }
        
        private function _newTextArea(label:String, ypos:Number, height:Number) : TextArea {
            var textArea:TextArea = new TextArea(this, 32, ypos);
            textArea.setSize(400, height);
            new Label(this, 32, ypos-20, label);
            return textArea;
        }
        
        private function _execute(event:Event) : void {
            var sourceCode:String, sourceChars:Array=[], inputChars:Array=[], outputChars:Array, i:int;
            
            // translate input text to char[]
            sourceCode = _source.text.replace(/[^<>+\-.,[\]]/gm, "");
            for (i=0; i<sourceCode.length;  i++) sourceChars.push(sourceCode.charCodeAt(i));
            for (i=0; i<_input.text.length; i++) inputChars.push(_input.text.charCodeAt(i));
            // null for the end of char[]
            sourceChars.push(0);
            inputChars.push(0);
            
            // execute interpreter
            outputChars = $(sourceChars, inputChars);
            
            // translate output char[] to text
            for (i=0; i<outputChars.length; i++) _output.text += String.fromCharCode(outputChars[i]);
            _output.text += "\n";
        }

        private var _source:TextArea, _input:TextArea, _output:TextArea;
    }
}