VoidLang implementation

example.js

var run = require("./parser");
run(",&[!#]|^&",false,function(o){
  console.log("> "+o);
});

main.js

var readlineSync = require('readline-sync');
var _EXIT = "__EXIT__";
function run(code, debug, printf){
    var printFunc = printf || console.log;
    var stack = [];
    var output = "";
    var is_push = false;
    var is_loop = true;
    var loop_addr = 0;
    for(var i = 0;i<=code.length;i++){
        if (debug && code[i]!=";") {
            console.log(code[i],stack,output);
        }
        if(is_push&&code[i]!="\""){
            stack.push(code[i]);
        } else {
            switch(code[i]){
                case "\"":
                    is_push = !is_push;
                    break;
                case "!":
                    output+=stack.shift();
                    break;
                case "*":
                    stack.unshift(stack.shift()*stack.shift());
                    break;
                case "/":
                    stack.unshift(stack.shift()/stack.shift());
                    break;
                case "+":
                    stack.unshift(Number(stack.shift())+Number(stack.shift()));
                    break;
                case "-":
                    stack.unshift(stack.shift()-stack.shift());
                    break;
                case "[":
                    is_loop = true;
                    loop_addr = i;
                    break;
                case "]":
                    if(is_loop) i = loop_addr;
                    break;
                case "~":
                    is_loop = false;
                    loop_addr = 0;
                    break;
                case "?":
                    if(stack[0]==0) {
                        is_loop = false;
                        loop_addr = 0;
                    }
                    break;
                case "#":
                    if(stack.length==0||stack.length==1) {
                        is_loop = false;
                        loop_addr = 0;
                    }
                    break;
                case ".":
                    stack.shift();
                    break;
                case "=":
                    if (arguments.callee == run) return _EXIT;
                    return output;
                    break;
                 case "%":
                    stack.unshift(Math.ceil(Math.random()*255));
                    break;   
                case "$":
                    stack.unshift(stack.length);
                    break;
                case "_":
                    if(!isNaN(parseInt(stack[0]))) {
                        stack.unshift(String.fromCharCode(parseInt(stack.shift())))
                    }
                    break;
                 case "&":
                    var o = run(stack.join(""),debug);
                    if (o == _EXIT) return output;
                    stack=[o];
                    break;  
                case ",":
                    stack.unshift(readlineSync.question());
                    break;
                case "^":
                    stack.unshift(code);
                    break;
                case "|":
                    printFunc(output);
                    output = "";
                    break;
                 case ";":
                    break;  
            }
        }
    }
    return output;
}
module.exports = run;