Script.NET

NEW POST: Performance - should be better

rafal_g — Tue, 06 May 2008 14:40:48 GMT

Hello, this time I'd like to post some good news. After such disappointing results I described above, I repeated the tests with script.net built on Irony toolkit and this time the results were completely different!
For the simple '2*2' expression test, 1000 iterations executed in 0.4 seconds
More complex data access expression (DataMutant access 'dob2.dob.data[1]') executed in 0.8 seconds (also 1000 iterations)
The Irony version does a much better job - performance is comparable to Jscript.net eval. There are some API changes also, making it more intuitive to use. So, it looks like script.net is becoming a very interesting tool.

Best regards
RG

NEW POST: Saving/restoring script engine state

rafal_g — Tue, 06 May 2008 13:48:46 GMT

Hi, thanx for your response. After digging a bit in script.net I think persisting the whole engine state is a bit of an overkill for my application. For the beginning, it would be enough to provide persistable 'Mutants' to hold my data. I have sent an email to you with additional questions regarding the use of mutants.
Best regards
RG

NEW POST: Performance - should be better

rafal_g — Tue, 06 May 2008 13:20:01 GMT

Hi, script.net is an interpreted language, so I expected it to be less performant than compiled code, but acceptably fast at expression evaluation (eval function). However, current version has disappointed me totally - it seems that the interpreter is able to execute only 10-15 simple evals per second on a 2ghz machine. This is not a very impressive result, as normal compilation on the fly can be faster than that. And comparison with JScript.net eval function (which also employs an interpreter) showed a dramatic difference.

1000 evals of expression "2 * 2" in Script.net took a minute and 4 seconds
1000 evals of more complex expression in JScript.net took 0.07 seconds (and the expression was modified in each iteration to make sure it is not pre-compiled)

The JScript is approx 1000 times faster in eval!

Here is my script.net test code:

Script scr = Script.Compile("eval('2 * 2');");
DateTime st = DateTime.Now;
for (int i = 0; i < 1000; i++)
{
scr.Execute();
}
log.Info("1000 compilations: {0}", DateTime.Now - st);

I know script.net is in early implementation phase, but I can't imagine why it is so slow in code interpretation. Is there any hope for it to get faster? Maybe DLR will help a bit?

PS A test with '2*2' expression in jscript.net took 0.2 seconds for 1000 iterations. That's slower, but still 300 times faster than script.net.

NEW POST: Lexer/Parser with Irony?

ppp_extr — Tue, 01 Apr 2008 12:48:03 GMT

Hi!
Yes, i have prepared an initial preview which you could download from http://www.protsyk.com/scriptdotnet.

The upcoming realeases will be integrated with Irony engine. I am planning the first one in May.

Best wishes
Petro

NEW POST: Saving/restoring script engine state

ppp_extr — Tue, 01 Apr 2008 12:44:56 GMT

Hello,
Thank you for your interest in Script.NET.

Script.NET runtime is able to persist its runtime state during application lifetime.
However to answer your question I need more detailed information.
If you are interested please contact me directly: piter.protsyk@gmail.com.

Also, aditional features would be possible implemented on your demand.

Best wishes
petro

NEW POST: Saving/restoring script engine state

rafal_g — Fri, 28 Mar 2008 08:28:40 GMT

Hello, I am thinking about using Script.Net as a scripting language for a workflow engine. However, I don't know if it supports some features I'd like very much to have.
The worklfow engine I'm creating would use script engine for implementing business logic and also for storing process internal data during process lifetime. Therefore it would be great if the script engine would allow me to persist its state so I wouldn't have to re-initialize it in each transaction. Also, if the script engine supported saving and restoring the state, it would be possible to implement transaction savepoints very easily.
Is this possible with script.net?

Best regards
RG

NEW POST: Lexer/Parser with Irony?

jmptrader — Thu, 27 Mar 2008 14:08:16 GMT

Hi Peter,
you have considered ? an release of the Script .NET with Irony (Lexer/Parser) Engine.
Very Thanks.
JM

Source code checked in

ppp_extr — Fri, 14 Mar 2008 14:59:11 GMT

Unit Tests updates

NEW POST: Calling AddType/AddObject only once?

ppp_extr — Fri, 14 Mar 2008 14:58:49 GMT

Hi, sorry for delaying with answer.

I have hopefully implemented your request. Please consider latest sources in Source Code section.
Here is an example:

Script s;
String Code, rez, test;

test = "Test object";
UserContext uc = new UserContext();
uc.AddObject("v1", test);
uc.AddType("MultiContext", typeof(MultiContext));

Code = "rez = v1; b = new MultiContext();";
s = Script.Compile(Code);
s.Execute(uc); // You can use UserContext object in any other script.
rez = (string)s.Lookup("rez");

If you have still question, please email: piter.protsyk@gmail.com

CLOSED ISSUE: Calling AddType/AddObject only once

ppp_extr — Fri, 14 Mar 2008 14:55:12 GMT

Calling AddType/AddObject only once

CLOSED ISSUE: IndexOf evalutation issues

ppp_extr — Fri, 14 Mar 2008 14:55:11 GMT

Hya,

Thanks for the fix for the negative conditions, but now i'm having a bit of an awkward issue, I need to do a Like comparison, to do this, i'm using IndexOf. So if the result of the IndexOf is greater than -1 the string contains the value.

The problem is that i'm getting the following exception on the following evaluation (o.Email.IndexOf('@')>-1):

Unhandled Exception: System.InvalidCastException: Null object cannot be converted to a value type.
at System.Convert.ChangeType(Object value, Type conversionType, IFormatProvider provider)
at System.Convert.ChangeType(Object value, Type conversionType)
at ScriptDotNet.ExpressionEvaluator.GE(Object o1, Object o2)
at ScriptDotNet.Expression.evaluate(ScriptContext Context)
at ScriptDotNet.Expression.evaluate(ScriptContext Context)
at ScriptDotNet.Expression.evaluate(ScriptContext Context)
at ScriptDotNet.IfStatement.Execute(ScriptContext Context)
at ScriptDotNet.JsProg.Execute(ScriptContext Context)
at ScriptDotNet.JsProg.Execute(ScriptContext Context)
at ScriptDotNet.JsProg.Execute(ScriptContext Context)
at ScriptDotNet.Script.Execute()

I managed to fix it by having (o.Email.IndexOf('@')>=0) instead, but it's a bit awkward that you can't use negative numbers on a evaluation!...

Any help would be appreciated,

Kind Regards,
Pedro Costa

Source code checked in

ppp_extr — Fri, 14 Mar 2008 14:55:09 GMT

Migration on Visual Studio 2008, the next release will be on .NET Framework 3.5

COMMENTED ISSUE: IndexOf evalutation issues

ppp_extr — Fri, 14 Mar 2008 14:53:13 GMT

Seems, this is fixed in the latest version. If it is still appears please e-mail me: piter.protsyk@gmail.com

CREATED ISSUE: Calling AddType/AddObject only once

ppp_extr — Fri, 14 Mar 2008 14:49:57 GMT

Calling AddType/AddObject only once

NEW POST: Calling AddType/AddObject only once?

foahchon — Sun, 02 Mar 2008 17:51:12 GMT

Hi, I'm trying to use Script.NET to add scripting to an application I'm working on, but it seems every time I want to compile/execute a block of code I have to AddType/AddObjects, which turns out to be a real detriment to performance since there are lots of objects/types I'd like to add. Is there any way that I can just call it once, and have those objects/types be accessible when I execute another block of code?

Thanks.

Source code checked in

ppp_extr — Fri, 25 Jan 2008 15:37:50 GMT

Improvements

Source code checked in

ppp_extr — Tue, 15 Jan 2008 14:31:59 GMT

Resolved problem with inner class name resolution in new expression

Source code checked in

ppp_extr — Sat, 12 Jan 2008 13:20:18 GMT

Another UnitTest

Source code checked in

ppp_extr — Sat, 12 Jan 2008 09:27:13 GMT

Strings changes

Source code checked in

ppp_extr — Fri, 11 Jan 2008 11:05:15 GMT

Verification Improvements