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Ideas on ways to handle a type definition for fixed fields. [message #647332]

Wed, 05 January 2011 16:42

drew frantz

Messages: 340
Registered: July 2009

Senior Member

We have recently added a number of fixed length datatype defintions into our
language lets call it FRUIT(1)...FRUIT(4). Currently I specify type fields
as Identifiers and was looking to add new rules to support these as well.
Anyone run across this problem, with some simple rules. I have tried a
couple of things, that don't seem to work so I am looking for some guidance.
thanks,drew

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Re: Ideas on ways to handle a type definition for fixed fields. [message #647366 is a reply to message #647332]

Wed, 05 January 2011 18:58

Alexander Nittka

Messages: 1193
Registered: July 2009

Senior Member

Hi,

sorry, I don't quite get what you are trying to do? Could you give a
couple of examples of the target syntax, i.e. what should your model
file look like?

Alex

Need training, onsite consulting or any other kind of help for Xtext?
Go visit http://xtext.itemis.com or send a mail to xtext@itemis.de

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Re: Ideas on ways to handle a type definition for fixed fields. [message #647368 is a reply to message #647366]

Wed, 05 January 2011 19:17

drew frantz

Messages: 340
Registered: July 2009

Senior Member

syntax:

typedef MyNewType
{
a : boolean ;
b : string;
c: fruit(1);
d: fruit(2);
e: fruit(10);

};

"Alexander Nittka" <alexander.nittka@itemis.de> wrote in message
news:ig2emi$m8p$1@news.eclipse.org...
> Hi,
>
> sorry, I don't quite get what you are trying to do? Could you give a
> couple of examples of the target syntax, i.e. what should your model file
> look like?
>
> Alex

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Re: Ideas on ways to handle a type definition for fixed fields. [message #647370 is a reply to message #647368]

Wed, 05 January 2011 19:27

Alexander Nittka

Messages: 1193
Registered: July 2009

Senior Member

Hi,

do you define the simple datatypes elsewhere?

Attribute: name=ID ':' type=[Type] (isArray?='(' fieldlength=INT ')')?

The idea of the isArray is that you can test whether a fieldlength is
set (the default value for an unset value would be 0).

But maybe this is still too far from what you want.

Alex

Need training, onsite consulting or any other kind of help for Xtext?
Go visit http://xtext.itemis.com or send a mail to xtext@itemis.de

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Re: Ideas on ways to handle a type definition for fixed fields. [message #647374 is a reply to message #647370]

Wed, 05 January 2011 20:25

drew frantz

Messages: 340
Registered: July 2009

Senior Member

Thanks. I came to similar solution using the ('(' fieldlength=INT ')')?

"Alexander Nittka" <alexander.nittka@itemis.de> wrote in message
news:ig2gcr$pec$1@news.eclipse.org...
> Hi,
>
> do you define the simple datatypes elsewhere?
>
> Attribute: name=ID ':' type=[Type] (isArray?='(' fieldlength=INT ')')?
>
> The idea of the isArray is that you can test whether a fieldlength is set
> (the default value for an unset value would be 0).
>
> But maybe this is still too far from what you want.
>
> Alex

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