Comments for Jakub Jankiewicz - jcubic http://jcubic.wordpress.com In Code We Trust Fri, 03 May 2013 15:14:05 +0000 hourly 1 http://wordpress.com/ Comment on How to have access to a shell without ssh or telnet using jQuery terminal by How to have access to a shell without ssh or telnet using jQuery terminal | Jakub Jankiewicz – jcubic | SetZero http://jcubic.wordpress.com/2012/06/09/how-to-have-access-to-a-shell-without-ssh-or-telnet-using-jquery-terminal/#comment-310 Fri, 03 May 2013 15:14:05 +0000 http://jcubic.wordpress.com/?p=492#comment-310 [...] How to have access to a shell without ssh or telnet using jQuery terminal | Jakub Jankiewicz –…. [...]

]]> Comment on Image color picker in javascript that work without canvas in every browser by jcubic http://jcubic.wordpress.com/2013/01/08/image-color-picker-in-javascript-that-work-without-canvas-in-every-browser/#comment-270 Mon, 11 Mar 2013 10:54:27 +0000 http://jcubic.wordpress.com/?p=550#comment-270 you need to have element with class “eyedropper” like a link that will activate the color picker.

]]> Comment on Image color picker in javascript that work without canvas in every browser by boudj http://jcubic.wordpress.com/2013/01/08/image-color-picker-in-javascript-that-work-without-canvas-in-every-browser/#comment-268 Thu, 21 Feb 2013 18:33:30 +0000 http://jcubic.wordpress.com/?p=550#comment-268 Here my code

[img id="img" name="filename" class="eyedropper" src="Penguins.jpg"}

[div style="width:100px;height:100px;border:1px #000 solid" class="color" ][/div]

]]> Comment on Image color picker in javascript that work without canvas in every browser by boudj http://jcubic.wordpress.com/2013/01/08/image-color-picker-in-javascript-that-work-without-canvas-in-every-browser/#comment-267 Thu, 21 Feb 2013 18:31:48 +0000 http://jcubic.wordpress.com/?p=550#comment-267 could you comment the javascript file?
for example I tried this but it’s not working :

Thank you :)

]]> Comment on How to use and extend BiwaScheme by kurt http://jcubic.wordpress.com/2010/05/17/how-to-use-biwascheme/#comment-250 Mon, 05 Nov 2012 11:11:38 +0000 http://jcubic.wordpress.com/?p=4#comment-250 Thanks a lot !
Your help made a big difference. Everything worked thus far.
:)

]]> Comment on How to use and extend BiwaScheme by jcubic http://jcubic.wordpress.com/2010/05/17/how-to-use-biwascheme/#comment-249 Fri, 02 Nov 2012 21:07:53 +0000 http://jcubic.wordpress.com/?p=4#comment-249 You have a typo:

var interpreter = new BiwaScheme.Interpreter();
var input = $("#input");
var output = $("#output");
function scheme_eval() {
interpreter.evaluate(input.val(),
function(result) {
if (result != undefined) {
result = BiwaScheme.to_write(result);
output[0].innerHTML += '> ' + result;
}
});
}
$("#eval_btn").click(function() {
scheme_eval();
});

and don’t include development_loader.js you already have all biwascheme inside biwascheme-min.js.

]]> Comment on How to use and extend BiwaScheme by jcubic http://jcubic.wordpress.com/2010/05/17/how-to-use-biwascheme/#comment-248 Fri, 02 Nov 2012 20:54:39 +0000 http://jcubic.wordpress.com/?p=4#comment-248 Don’t use dumper code

var opc = intepreter.compile(input.val());
var dump_opc = (new BiwaScheme.Dumper()).dump_opc(opc);
output[0].innerHTML = dump_opc;

and use error callback function

var bscheme = new BiwaScheme.Interpreter(function(e, state) {
    output[0].innerHTML += e.message + '\n';
});
]]> Comment on How to use and extend BiwaScheme by kurt http://jcubic.wordpress.com/2010/05/17/how-to-use-biwascheme/#comment-247 Fri, 02 Nov 2012 17:07:27 +0000 http://jcubic.wordpress.com/?p=4#comment-247 Wow, I had that problem resolved. Sorry, for this. The issue was, with 
output[0].innerHTML += '> ' + result;

It should have been :

output.text(result);

I read up in the source code of BiwaScheme demo REPL on the main page of BiwaScheme.
Since you are the author of jQuery terminal, and jQuery terminal is used in it, I wanted to ask you about it.

The output gets displayed easily.
But if the input is incorrect (syntactically, gramatically), error messages have to be shown.
For this, I did ,

var opc = intepreter.compile(input.val());
var dump_opc = (new BiwaScheme.Dumper()).dump_opc(opc);
output[0].innerHTML = dump_opc;

But the problem is the error messages are encoded in some manner.
I got this as the output when I typed “(efes Awd)” into the input 

[frame
   [refer-global "Awd"
   [argument
   [constant 1
   [argument
   [refer-global "efes"
   [apply]]]]]]
[halt]]

But when I tried the same in BiwaScheme interpreter, (in the main page biwascheme.org),
there were error messages like :

Error: execute: unbound symbol: ''
Error: execute: unbound symbol: 'Awd'

I looked at the code again. The term.echo somehow displays those messages.
But I’m not using an REPL. I’m just dealing with a textarea for input code and a div for output.
How do I use that message to generate a useful message like ?

Error: execute: unbound symbol: ''
Error: execute: unbound symbol: 'Awd'

<html>
<head>
	<title>Scheme</title>
	<script type = "text/javascript" src = "http://www.biwascheme.org/repos/release/biwascheme-min.js&quot; ></script>
	<script type="text/javascript" src="http://code.jquery.com/jquery-latest.js"></script&gt;
</head>
<body>
	<textarea rows = 20 cols = 50 id = "input" style = "float : left"></textarea>
	<div id = "output" style = "padding : 20px; margin-left : 30px; float : left; width : 300px; height : 285px; border:1px solid black; ">Result</div>
	<input type = "button" id = "eval_btn" value = "Evaluate"></input>
	<script>
		var intepreter;
		var input;
		var output;
		$(document).ready(
			function() {
				intepreter = new BiwaScheme.Interpreter();
				input = $("#input");
				output = $("#output");
		});
		function unbalanced_parentheses(text_code) {
			var tokens = (new BiwaScheme.Parser(text_code)).tokens;
			var parentheses = 0;
			var brakets = 0;
			for(var i = 0; i < tokens.length; ++i) {
				switch(tokens[i]) {
					case "[": ++brakets; break;
					case "]": --brakets; break;
					case "(": ++parentheses; break;
					case ")": --parentheses; break;
				}
			}
			return parentheses != 0 || brakets != 0;
		}

		function scheme_eval() {
			output.css("color", "black");
			output.text("Result should appear here");
			if(unbalanced_parentheses(input.val())) {
				output.css("color", "red");
				output.text("Unbalanced Parentheses");
			}
			else {
				var opc = intepreter.compile(input.val());
        		  	var dump_opc = (new BiwaScheme.Dumper()).dump_opc(opc);
        		  	output[0].innerHTML = (dump_opc);
        		  	
				/*intepreter.evaluate(input.val(),
					function(result) {
						if(result === BiwaScheme.undef) {
							output.css("color", "blue");
							output.text("Nothing to output");
						}
						else if (result != undefined) {
							result = BiwaScheme.to_write(result);
							output.text(result);
						}
				});*/
    			}
		}
		$("#eval_btn").click(function() {
		  	scheme_eval();
		});
	</script>
</body>
</html>

This is the code I’m using. Is it possible to know when there is an error and when there isn’t?

]]> Comment on How to use and extend BiwaScheme by kurt http://jcubic.wordpress.com/2010/05/17/how-to-use-biwascheme/#comment-246 Fri, 02 Nov 2012 13:05:10 +0000 http://jcubic.wordpress.com/?p=4#comment-246 Thank you.
I couldn’t verify it yet, because I’m trying to just setup a working Scheme text evaluator first.

I tried this out. But I find that the callback function passed to evaluate, is not called at all. I tried implementing the cod ein this tutorial.
Here is my code:

<html>
<head>
	<title>Scheme</title>
	<script type = "text/javascript" src = "http://www.biwascheme.org/repos/release/biwascheme-min.js&quot; ></script>
	<script type="text/javascript" src="https://raw.github.com/yhara/biwascheme/master/src/development_loader.js"></script&gt;
	<script type="text/javascript" src="http://code.jquery.com/jquery-latest.js"></script&gt;
</head>
<body>
	<textarea rows = 20 cols = 50 id = "input"></textarea>
	<div id = "output">Result should appear here</div>
	<input type = "button" id = "eval_btn" value = "Evaluate"></input>
	
	<script>
		var intepreter = new BiwaScheme.Interpreter();
		var input = $("#input");
		var output = $("#output");
		function scheme_eval() {
		    interpreter.evaluate(input.val(), 
		       function(result) {
		           if (result != undefined) {
		           	alert("Evaluating");
		               result = BiwaScheme.to_write(result);
		               output[0].innerHTML += '> ' + result;
		           }
		 	  });
		}
		$("#eval_btn").click(function() {
		  	scheme_eval();
		});
	</script>
</body>
</html>

I’ve put the code here
http://pastebin.com/QuAajf1b
if you can’t see the code I’ve pasted above.

There is a textarea with id = input where user types Scheme code.
There is a div with id = output where the output should go.
There is button which starts the interpreting.
But I find that nothing happens when I start the evaluation.
There is no alert message “Evaluating”.
Is something wrong in my code?
I am particularly unsure of what to pass to the evaluate function.
Will .value() of jquery work?
I’m lost here.

]]> Comment on How to use and extend BiwaScheme by jcubic http://jcubic.wordpress.com/2010/05/17/how-to-use-biwascheme/#comment-245 Thu, 01 Nov 2012 12:52:56 +0000 http://jcubic.wordpress.com/?p=4#comment-245 To define your change-text function you need to call BiwaScheme.define_libfunc method/function. Probably something like:

BiwaScheme.define_libfunc('change-text', 1, 1, function(args) {
   change(args[0]);
   return BiwaScheme.undef;
});
]]>