I need help converting the fallowing code to vb.net, or if any one knows where i can download LISP Interpreter (VB.NET)
Thanks - <html>
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<head>
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<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script>
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<script type="text/javascript">
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var DEBUG = 1;
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var TEST = [
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"(cons 1 nil)",
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"(+ 1 2 (* 3 4))"
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][0]
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var _text = null;
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var _balanced = 0;
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var _env = null;
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var b = 0;
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function init()
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{
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//(defun fact (x) (if (<= x 1) 1 (* x (fact (- x 1))))) (fact 3)
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document.getElementById("demo").innerHTML= read("(defun fact (x) (if (<= x 1) 1 (* x (fact (- x 1))))) (fact 3)");
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}
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function read(text)
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{
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try
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{
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_balanced = 0;
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_text = $.trim(text);
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var code = ["list"];
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while (_text.length)
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{
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var s = parser();
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//alert(s.length)
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code = code.concat(s);
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//alert(code)
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}
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if (_balanced > 0)
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throw "The expression is not balanced. Add "+_balanced+" parentheses.";
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else if (_balanced < 0)
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throw "The expression is not balanced. Remove "+_balanced+" parentheses.";
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// trace(code);
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if (!_env) _env = {};
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return (eval_(code, _env)).pop();
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}
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catch (e)
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{
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return "Error: "+e;
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}
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}
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function eval_(expr, env)
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{
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//alert(b+": "+expr+" : env: "+env);
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// atoms
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b +=1
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if (!isNaN(expr))
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{
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return Number(expr);
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}
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else if (expr == "nil")
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{
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return null;
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}
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else if (expr[0] == '"')
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{
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return expr.slice(1);
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// list
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}
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else if (expr[0] == "list")
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{
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return $.map(expr.slice(1),
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function(x)
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{
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//alert(x)
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var v = eval_(x, env);
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if ($.isArray(v))
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return Array(v);
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return v;
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});
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// variables
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}
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else if (getenv(expr, env))
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{
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return getenv(expr, env);
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}
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else if (expr[0] == "setq" || expr[0] == "set!")
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{
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env[expr[1]] = eval_(expr[2], env);
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return env[expr[1]];
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// conditional
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}
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else if (expr[0] == "if")
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{
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if (eval_(expr[1], env))
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return eval_(expr[2], env);
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$.each(expr.slice(2, expr[expr.length - 2]),
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function(i, x) { eval_(x, env); });
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return eval_(expr[expr.length - 1], env);
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// procedures
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}
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else if (expr in operators)
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{
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var z = operators[expr];
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return z; //operators[expr];
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}
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else if (expr[0] == "lambda")
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{
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return makeproc(expr[1], expr.slice(2), env);
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}
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else if (expr[0] == "defun")
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{
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alert(expr)
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env[expr[1]] = makeproc(expr[2], expr.slice(3), env);
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return env[expr[1]];
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}
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else if (expr[0] == "js")
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{
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// call a javascript function
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return eval(expr[1]);
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// apply
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}
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else if ($.isArray(expr))
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{
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return apply_(
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eval_(expr[0], env),
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$.map(expr.slice(1), function(x, i)
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{
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var v = eval_(x, env);
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if ($.isArray(v))
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return Array(v);
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return v;
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})
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);
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// error
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}
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else
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{
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throw expr+" is not defined"
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}
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}
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function apply_(proc, args)
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{
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if ($.isFunction(proc)) {
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return proc.apply(this, args);
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}
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throw "Procedure "+proc+" is not defined";
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}
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function makeproc(args, body, env) {
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return function() {
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// extend the env
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//alert(arguments)
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var arguments_ = arguments;
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var newenv = {};
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newenv["__up__"] = env;
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$.each(args, function(i, x) { newenv[x] = arguments_[i]; });
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$.each(body.slice(0, body.length - 1),
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function(i, x) { eval_(x, newenv); });
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return eval_(body[body.length - 1], newenv);
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};
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}
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function getenv(expr, env)
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{
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if (typeof expr != "string") return false;
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if (expr in env) return env[expr];
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if ("__up__" in env) return getenv(expr, env["__up__"]);
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return false;
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};
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////////////////
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// primitives //
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////////////////
-
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var operators = {
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// list
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"car":function() {
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var l = arguments[0];
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if (!l || !l.length) return null;
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return l[0];
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},
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"cdr":function() {
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var l = arguments[0];
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if (!l || !l.length) return [];
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return l.slice(1);
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},
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"cons":function() {
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var a = arguments[1];
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if (a == null) return [arguments[0]];
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a.unshift(arguments[0])
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return a;
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},
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// logical
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"not":function() {
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return !arguments[0];
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},
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"and":function() {
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for (var i = 0; i < arguments.length; i++) {
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if (!arguments[i]) return false;
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}
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return true;
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},
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"or":function() {
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for (var i = 0; i < arguments.length; i++) {
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if (arguments[i]) return true;
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}
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return false;
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},
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// comparison
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"<=":function(x, y) { return x <= y; },
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"<":function(x, y) { return x < y; },
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">=":function(x, y) { return x >= y; },
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">":function(x, y) { return x > y; },
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"=":function(x, y) { return x == y; },
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"eq":function(x, y) { return x === y; },
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// arithmetic
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"+":function() {
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var res = 0;
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$.each(arguments, function(i, x) { res += x; });
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return res;
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},
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"-":function() {
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var res = arguments[0] * 2;
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$.each(arguments, function(i, x) { res -= x; });
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return res;
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},
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"*":function() {
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var res = 1;
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$.each(arguments, function(i, x) { res *= x; });
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return res;
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},
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"/":function() {
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var res = arguments[0] * arguments[0];
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$.each(arguments, function(i, x) { res /= x; });
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return res;
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}
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};
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///////////////////////////
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// convert text to lists //
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///////////////////////////
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function scanner()
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{
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if (!_text.length) return "";
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var start = 0, index = 1;
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if (_text.charAt(0) == "(" || _text.charAt(0) == ")")
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{
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index = 1;
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// check the text is balanced
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_balanced += _text.charAt(0) == "(" ? 1 : -1;
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}
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else if (_text.charAt(0) == '"')
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{
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index = _text.search(/[^\\]"/) + 1;
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}
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else
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{
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index = _text.search(/[ \n)]/);
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}
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//alert(index)
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if (index < 1) index = _text.length;
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var t = _text.substring(start, index);
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_text = $.trim(_text.substring(index));
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return t;
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}
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function parser()
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{
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var result = [];
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var token = scanner();
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while (token != ")" && token != "")
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{
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var expr = null;
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if (token == "(")
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expr = parser();
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else
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expr = token;
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result.push(expr);
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token = scanner();
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}
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return result;
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}
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</script>
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</head>
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<body>
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<h1>My First Web Page</h1>
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<p id="demo">This is a paragraph.</p>
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<button type="button" onclick="init()">Display Date</button>
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</body>
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</html>
2  11122 
Hi,
post the question in the .net framework section you might get help there?
regards,
Omer Aslam
Javascript and .net run in two different platform,
Javascript run on Clinet Site on the other hand .Net Run on server Side(Arguably, If you develop a plugin with .Net to run on Clint site, like Java, Its another story).
So far, its an ambiguous conversion
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