Jurassic - A Javascript Compiler for .NET

New Post: What is the scope of script?

paulbartrum — Thu, 06 Jun 2013 22:13:25 GMT

Is the code run in the Execute and ExecuteFile methods added to the global scope of the instance of engine?

Yes. If you think about it, there's not really any other way it could work.

I can't tell you why you're getting "'myThing.myFunction' is not a function" though, because it depends on the context of where you are trying to call that function. (Remember that Execute and ExecuteFile always operate from the global context, but function calls can be made from within global or non-global contexts)

New Post: What is the scope of script?

Alxandr — Thu, 06 Jun 2013 16:04:27 GMT

Some actual code might help...

New Post: What is the scope of script?

dob — Thu, 06 Jun 2013 13:49:20 GMT

I've been trying to compile and run a combination of scripts, and I keep running into the same problem with Jurassic, 'Jurassic.JavaScriptException: TypeError: 'myThing.myFunction' is not a function'. If I execute some code to add a variable to point to 'myThing.myFunction', then it works, similarly if i evaluate 'typeof myThing.myFunction' then the result is 'function'.

Can anyone explain why this is? What is the scope of code that has been executed on an instance of ScriptEngine? Is the code run in the Execute and ExecuteFile methods added to the global scope of the instance of engine?

Commented Unassigned: Jurassic error on latest JSHint [30003]

ThomasArdal — Wed, 05 Jun 2013 17:17:41 GMT

Commented Unassigned: Jurassic error on latest JSHint [30003]

paulbartrum — Wed, 05 Jun 2013 06:52:18 GMT

Commented Unassigned: Jurassic error on latest JSHint [30003]

ThomasArdal — Wed, 05 Jun 2013 06:24:52 GMT

When executing the latest JSHint script, Jurassic throws an exception:

Jurassic.JavaScriptException was unhandled by user code
HResult=-2146233088
Message=SyntaxError: Expected identifier but found 'char'
Source=Jurassic
LineNumber=1763
Name=SyntaxError
StackTrace:
at Jurassic.Compiler.Parser.ExpectIdentifier()
at Jurassic.Compiler.Parser.ParseVar()
at Jurassic.Compiler.Parser.ParseStatementNoNewContext()
at Jurassic.Compiler.Parser.ParseStatement()
at Jurassic.Compiler.Parser.Parse()
at Jurassic.Compiler.Parser.ParseFunction(FunctionType functionType, Scope parentScope)
at Jurassic.Compiler.Parser.ParseFunctionExpression()
at Jurassic.Compiler.Parser.ParseExpression(Token[] endTokens)
at Jurassic.Compiler.Parser.ParseObjectLiteral()
at Jurassic.Compiler.Parser.ParseExpression(Token[] endTokens)
at Jurassic.Compiler.Parser.ParseLabelOrExpressionStatement()
at Jurassic.Compiler.Parser.ParseStatementNoNewContext()
at Jurassic.Compiler.Parser.ParseStatement()
at Jurassic.Compiler.Parser.Parse()
at Jurassic.Compiler.Parser.ParseFunction(FunctionType functionType, Scope parentScope)
at Jurassic.Compiler.Parser.ParseFunctionExpression()
at Jurassic.Compiler.Parser.ParseExpression(Token[] endTokens)
at Jurassic.Compiler.Parser.ParseLabelOrExpressionStatement()
at Jurassic.Compiler.Parser.ParseStatementNoNewContext()
at Jurassic.Compiler.Parser.ParseStatement()
at Jurassic.Compiler.Parser.Parse()
at Jurassic.Compiler.Parser.ParseFunction(FunctionType functionType, Scope parentScope)
at Jurassic.Compiler.Parser.ParseFunctionExpression()
at Jurassic.Compiler.Parser.ParseExpression(Token[] endTokens)
at Jurassic.Compiler.Parser.ParseArrayLiteral()
at Jurassic.Compiler.Parser.ParseExpression(Token[] endTokens)
at Jurassic.Compiler.Parser.ParseObjectLiteral()
at Jurassic.Compiler.Parser.ParseExpression(Token[] endTokens)
at Jurassic.Compiler.Parser.ParseLabelOrExpressionStatement()
at Jurassic.Compiler.Parser.ParseStatementNoNewContext()
at Jurassic.Compiler.Parser.ParseStatement()
at Jurassic.Compiler.Parser.Parse()
at Jurassic.Compiler.Parser.ParseFunction(FunctionType functionType, Scope parentScope)
at Jurassic.Compiler.Parser.ParseFunctionExpression()
at Jurassic.Compiler.Parser.ParseExpression(Token[] endTokens)
at Jurassic.Compiler.Parser.ParseLabelOrExpressionStatement()
at Jurassic.Compiler.Parser.ParseStatementNoNewContext()
at Jurassic.Compiler.Parser.ParseStatement()
at Jurassic.Compiler.Parser.Parse()
at Jurassic.Compiler.GlobalMethodGenerator.Parse()
at Jurassic.ScriptEngine.Execute(ScriptSource source)
at Jurassic.ScriptEngine.Execute(String code)
InnerException:

The JSHint script runs fine in Chrome 27.

The latest script can be found here: http://www.jshint.com/get/jshint-2.1.3.js
Comments: I'm using ECMAScript3 compatibility mode to avoid Jurassic throwing this exception: Jurassic.JavaScriptException was unhandled by user code HResult=-2146233088 Message=SyntaxError: Octal escape sequences are only supported in ECMAScript 3 compatibility mode. Source=Jurassic LineNumber=7747 Name=SyntaxError StackTrace: at Jurassic.Compiler.Lexer.ReadOctalEscapeSequence(Int32 firstDigit) at Jurassic.Compiler.Lexer.ReadStringLiteral(Int32 firstChar) at Jurassic.Compiler.Lexer.NextToken() at Jurassic.Compiler.Parser.Consume(ParserExpressionState expressionState) at Jurassic.Compiler.Parser.Expect(Token token) at Jurassic.Compiler.Parser.ParseReturn() at Jurassic.Compiler.Parser.ParseStatementNoNewContext() at Jurassic.Compiler.Parser.ParseStatement() at Jurassic.Compiler.Parser.ParseBlock() at Jurassic.Compiler.Parser.ParseStatementNoNewContext() at Jurassic.Compiler.Parser.ParseStatement() at Jurassic.Compiler.Parser.ParseIf() at Jurassic.Compiler.Parser.ParseStatementNoNewContext() at Jurassic.Compiler.Parser.ParseStatement() at Jurassic.Compiler.Parser.Parse() at Jurassic.Compiler.Parser.ParseFunction(FunctionType functionType, Scope parentScope) at Jurassic.Compiler.Parser.ParseFunctionExpression() at Jurassic.Compiler.Parser.ParseExpression(Token[] endTokens) at Jurassic.Compiler.Parser.ParseVar() at Jurassic.Compiler.Parser.ParseStatementNoNewContext() at Jurassic.Compiler.Parser.ParseStatement() at Jurassic.Compiler.Parser.Parse() at Jurassic.Compiler.Parser.ParseFunction(FunctionType functionType, Scope parentScope) at Jurassic.Compiler.Parser.ParseFunctionExpression() at Jurassic.Compiler.Parser.ParseExpression(Token[] endTokens) at Jurassic.Compiler.Parser.ParseLabelOrExpressionStatement() at Jurassic.Compiler.Parser.ParseStatementNoNewContext() at Jurassic.Compiler.Parser.ParseStatement() at Jurassic.Compiler.Parser.Parse() at Jurassic.Compiler.Parser.ParseFunction(FunctionType functionType, Scope parentScope) at Jurassic.Compiler.Parser.ParseFunctionExpression() at Jurassic.Compiler.Parser.ParseExpression(Token[] endTokens) at Jurassic.Compiler.Parser.ParseArrayLiteral() at Jurassic.Compiler.Parser.ParseExpression(Token[] endTokens) at Jurassic.Compiler.Parser.ParseObjectLiteral() at Jurassic.Compiler.Parser.ParseExpression(Token[] endTokens) at Jurassic.Compiler.Parser.ParseLabelOrExpressionStatement() at Jurassic.Compiler.Parser.ParseStatementNoNewContext() at Jurassic.Compiler.Parser.ParseStatement() at Jurassic.Compiler.Parser.Parse() at Jurassic.Compiler.Parser.ParseFunction(FunctionType functionType, Scope parentScope) at Jurassic.Compiler.Parser.ParseFunctionExpression() at Jurassic.Compiler.Parser.ParseExpression(Token[] endTokens) at Jurassic.Compiler.Parser.ParseLabelOrExpressionStatement() at Jurassic.Compiler.Parser.ParseStatementNoNewContext() at Jurassic.Compiler.Parser.ParseStatement() at Jurassic.Compiler.Parser.Parse() at Jurassic.Compiler.GlobalMethodGenerator.Parse() at Jurassic.ScriptEngine.Execute(ScriptSource source) at Jurassic.ScriptEngine.Execute(String code) InnerException:

Commented Unassigned: Jurassic error on latest JSHint [30003]

paulbartrum — Tue, 04 Jun 2013 21:51:00 GMT

Created Unassigned: Jurassic error on latest JSHint [30003]

ThomasArdal — Tue, 04 Jun 2013 19:19:09 GMT

New Post: Cannot convert object of type 'System.Windows.Forms.Form' to an object. Parametername: value

furesoft — Thu, 23 May 2013 17:20:09 GMT

hi,
i have a error: Cannot convert object of type 'System.Windows.Forms.Form' to an object.
Parametername: value

how i fix it?

please help me, i would edit a form with js

New Post: Assertion failed

oobenoob — Tue, 21 May 2013 20:01:55 GMT

Nevermind... Seems to only do it in debug mode.

New Post: Assertion failed

oobenoob — Tue, 21 May 2013 18:31:08 GMT

If I try the following...

try { js.Evaluate("sdF:[(L)"); }
catch (JavaScriptException e) { }
catch { }

Rather than the catch blocks detecting the rubbish script being evaluated, an "Assertion Failed" dialog appears, asking me to ignore/retry/abort.

New Post: variable declaration- problem with own datattype

furesoft — Tue, 21 May 2013 09:53:38 GMT

hello,
i have this classes:

public class SessionConstructor : ClrFunction
    {

        public SessionConstructor(ScriptEngine engine, string path) : base(engine.Function.InstancePrototype, "Session", new SessionInstance(engine.Object.InstancePrototype, path))
        {
        }

        [JSConstructorFunction()]
        public SessionInstance Construct(string path)
        {
            return new SessionInstance(this.InstancePrototype, path);
        }
    }

    public class SessionInstance : ObjectInstance
    {

        private Dictionary<string, object> _items = new Dictionary<string, object>();

        private string path;
        public SessionInstance(ObjectInstance prototype, string path) : base(prototype)
        {
            this.path = path;
            if (System.IO.File.Exists(path + "\\sessions")) {
                load();
            }
            this.PopulateFunctions();
        }

        [JSFunction(Name = "Add")]
        public void Add(string k, string v)
        {
            if (_items.ContainsKey(k)) {
                _items[k] = v;
            } else {
                _items.Add(k, v);
            }
            Save();
        }

        [JSFunction(Name = "Get")]
        public string Get(string k)
        {
            if (_items.ContainsKey(k)) {
                return _items[k];
            }
            return "";
        }

        private void Save()
        {
            StringBuilder c = new StringBuilder();

            foreach (object l_loopVariable in _items) {
                l = l_loopVariable;
                c.AppendLine(l.Key + "=" + l.Value.ToString);
            }

            System.IO.File.WriteAllText(path + "\\sessions", c.ToString());
        }

        private void load()
        {
            _items.Clear();

            foreach (object l_loopVariable in System.IO.File.ReadAllLines(path + "\\sessions")) {
                l = l_loopVariable;
                string k = l.Split("=")(0);
                string v = l.Split("=")(1);

                _items.Add(k, v);
            }

        }

        [JSFunction(Name = "Destroy")]
        public void Destroy()
        {
            System.IO.File.Delete(path + "\\sessions");
            _items.Clear();
        }

        [JSFunction(Name = "Unset")]
        public void Unset(string k)
        {
            _items.Remove(k);
            Save();
        }

    }

and i will use this in javascript-code:

var session = new Session(AddinPath);
        
        session.Add("d",now);

but this make nothing.
please help me

New Post: Date parsing - doesn't like millsecond portion

paulbartrum — Thu, 16 May 2013 00:18:19 GMT

The example I provided does parse to a local time -- in Jurassic -- but it turns out this is a standard violation; ECMAScript 5.1 says that a missing time-zone should be interpreted as UTC. There is actually no standards-compliant way of parsing a local date & time, without explicitly specifying the time-zone (e.g. "2013-01-01T13:59:05.123+13:00"). In my defence, IE 10 and Firefox 21 both get this wrong (presumably because the local time-zone defaulting behaviour is more useful). Also, the ECMAScript standard conflicts with ISO 8601 which says that the absence of a time-zone should be interpreted as the local time-zone. Standards are great, huh?

New Post: Date parsing - doesn't like millsecond portion

joepotato — Wed, 15 May 2013 16:59:13 GMT

Thanks. I wound up implementing the millisecond parsing for unstructured dates in our Jurassic build (in DateParser). The problem is I can't use ECMA string because they parse to UTC, and in our app we use relative time strings based the current user time zone among other things.

New Post: Debugging API that the host app can control?

Waqaar — Wed, 15 May 2013 09:45:34 GMT

If I have to support raising an event after each line of code execution in Java Script.

I have found this method "InlineSetPropertyValue" in class Jurassic.Library.ObjectInstance for simple line of execution but what will be the method for functions ?

SampleJs.js
var count = 1; // worked //Jurassic.Library.ObjectInstance InlineSetPropertyValue
myFunction();
function myFunction()
{

var t1 = "inside my function"; //dont work

}
var t2 = "end";

Thanks in advance.

New Post: Date parsing - doesn't like millsecond portion

paulbartrum — Wed, 15 May 2013 02:47:05 GMT

Correct, Jurassic doesn't support this type of date string (unstructured, with milliseconds). A quick check reveals that Chrome supports it in their javascript implementation, but Firefox and IE don't.

This is the equivalent ECMAScript standard date string, which works in all browsers:

new Date("2013-01-01T13:59:05.123")

New Post: Date parsing - doesn't like millsecond portion

joepotato — Wed, 15 May 2013 00:46:46 GMT

I am trying to parse a date string into a Date object.

This works: 1/1/2013 13:59:05
This doesn't: 1/1/2013 13:59:05.123

var d = new Date("1/1/2013 13:59:05.123");
var invalid = (d == null || isNaN(d.getHours()));
// invalid == true

New Post: Debugging in Jurassic

paulbartrum — Mon, 13 May 2013 23:59:16 GMT

I think what is needed is a visual studio extension called a "expression evaluator". See here for sample code: http://msdn.microsoft.com/en-us/library/8fwk67y3(v=vs.90).aspx Fair warning though: implementing a expression evaluator is not for the faint of heart; it requires significant COM experience for one.

New Post: WebSocket

paulbartrum — Mon, 13 May 2013 23:51:23 GMT

Sorry, no, WebSockets are not part of javascript and therefore not part of Jurassic either.

New Post: WebSocket

ischyrus — Mon, 13 May 2013 19:49:20 GMT

I was wondering, does Jurassic handle\compile WebSocket calls and connections?