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XText Attribute Order [message #652594]

Fri, 04 February 2011 16:26

Jesse

Messages: 10
Registered: January 2011

Junior Member

Hi there,

I'm working on a prototype DSL for Eclipse e4 UIElements. It's looking okay, but one thing that I can't seem to figure out is how to let users define attributes in any order.

eg.

Command returns commands::Command:
{commands::Command}
'Command'
elementId=EString
'{'
('category' category=[commands::Category|EString])?
('commandName' commandName=EString)?
('contributorURI' contributorURI=EString)?
('description' description=EString)?
('parameters' '{' parameters+=CommandParameter ( parameters+=CommandParameter)* '}')?
('tags' '{' tags+=EString ( tags+=EString)* '}')?
'}';

When trying out the DSL, attributes can only be defined in the order that is specified above (eg. if you want to define category, then it MUST be defined first). I'd like to be able to define them in any order. Is there a way to do this? It seemed to be causing a lot of confusion at first, so I sorted all attributes in alphabetical order as a "workaround", but that's not good enough.

Any help would be much appreciated!

Thanks.

- Jesse

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Re: XText Attribute Order [message #652598 is a reply to message #652594]

Fri, 04 February 2011 16:37

Sylvain EVEILLARD

Messages: 556
Registered: July 2009

Senior Member

Quote:

The Xtext grammar language now offers a new operator '&' to separate elements in a group that can only occur once but in any order, like the modifier keywords 'public', 'static', 'synchronized' in Java.

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Re: XText Attribute Order [message #652600 is a reply to message #652594]

Fri, 04 February 2011 16:32

Lorenzo Bettini

Messages: 1812
Registered: July 2009
Location: Firenze, Italy

Senior Member

On 02/04/2011 05:26 PM, Jesse wrote:
> Hi there,
>
> I'm working on a prototype DSL for Eclipse e4 UIElements. It's looking
> okay, but one thing that I can't seem to figure out is how to let users
> define attributes in any order.
>
> eg.
> Command returns commands::Command:
> {commands::Command}
> 'Command'
> elementId=EString
> '{'
> ('category' category=[commands::Category|EString])?
> ('commandName' commandName=EString)?
> ('contributorURI' contributorURI=EString)?
> ('description' description=EString)?
> ('parameters' '{' parameters+=CommandParameter (
> parameters+=CommandParameter)* '}')?
> ('tags' '{' tags+=EString ( tags+=EString)* '}')?
> '}';
>
>
> When trying out the DSL, attributes can only be defined in the order
> that is specified above (eg. if you want to define category, then it
> MUST be defined first). I'd like to be able to define them in any order.
> Is there a way to do this? It seemed to be causing a lot of confusion at
> first, so I sorted all attributes in alphabetical order as a
> "workaround", but that's not good enough.
> Any help would be much appreciated!
>
> Thanks.
>
> - Jesse
>

could "unordered groups" help you?

see http://www.eclipse.org/Xtext/documentation/1_0_1/xtext.html

cheers
Lorenzo

--
Lorenzo Bettini, PhD in Computer Science, DI, Univ. Torino
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HOME: http://www.lorenzobettini.it
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Re: XText Attribute Order [message #652613 is a reply to message #652594]

Fri, 04 February 2011 17:23

Sebastian Zarnekow

Messages: 3118
Registered: July 2009

Senior Member

Hi Jesse,

are you aware of https://github.com/meysholdt/e4dsl ?

Regards,
Sebastian
--
Need professional support for Eclipse Modeling?
Go visit: http://xtext.itemis.com

Am 04.02.11 17:26, schrieb Jesse:
> Hi there,
>
> I'm working on a prototype DSL for Eclipse e4 UIElements. It's looking
> okay, but one thing that I can't seem to figure out is how to let users
> define attributes in any order.
>
> eg.
> Command returns commands::Command:
> {commands::Command}
> 'Command'
> elementId=EString
> '{'
> ('category' category=[commands::Category|EString])?
> ('commandName' commandName=EString)?
> ('contributorURI' contributorURI=EString)?
> ('description' description=EString)?
> ('parameters' '{' parameters+=CommandParameter (
> parameters+=CommandParameter)* '}')?
> ('tags' '{' tags+=EString ( tags+=EString)* '}')?
> '}';
>
>
> When trying out the DSL, attributes can only be defined in the order
> that is specified above (eg. if you want to define category, then it
> MUST be defined first). I'd like to be able to define them in any order.
> Is there a way to do this? It seemed to be causing a lot of confusion at
> first, so I sorted all attributes in alphabetical order as a
> "workaround", but that's not good enough.
> Any help would be much appreciated!
>
> Thanks.
>
> - Jesse
>

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