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Model meta elements and their instances? [message #1808656]

Fri, 28 June 2019 05:06

Eclipse User

Hi there,

for an UI, I want to model the screen configuration within my DSL as well as their instances. It should be possible to describe the UI configuration options and create concrete instances.

E.g. Editors should contain different attributes which could be optional/mandatory and so on. Instances of specific editors need to set all mandatory attributes.

When I add all possible Editors and their attributes in the xtext DSL, I would know how to implement this. But with the editors as part of the concrete files, I'm lost.

Is this possible? Could you please give me some hints, how achive this? Thank you!

Greetings,
Matthias

Re: Model meta elements and their instances? [message #1808699 is a reply to message #1808656]

Fri, 28 June 2019 14:20

Eclipse User

Hi I am not sure if I understand you problem

If you have two dsl or one dsl with two parts you can have something like

Class : „class" name =ID;

Instance: „inst" classed=[Class];

Then you can do the same with attributes scoping content assist

Re: Model meta elements and their instances? [message #1808702 is a reply to message #1808699]

Fri, 28 June 2019 16:11

Eclipse User

Hi

Adding a graphical model overlay onto an information model is a fairly standard problem. See Sirius and Papyrus.

So long as you always use the UI editor to edit one graphical overlay on one information model it is relatively straightforward. (The old Ecore Tools did this.) As soon as you start to accommodate independent collaborative information editing you hit a graphical catch-up / auto-layout challenge. Once you have multiple models you can get in a complete mess which is IMHO what both Papyrus and Sirius have done.

However since Sirius is there and works with arbitrary Ecore metamodels, I would recommend that you at least see how you get on with Sirius before attempting to do your own thing.

Regards

Ed Willink

Re: Model meta elements and their instances? [message #1809927 is a reply to message #1808656]

Thu, 25 July 2019 14:48

Eclipse User

Hey, sorry for the late reply and sorry for my bad explanation.

I plan an UI platform with several different Views. Every view needs different properties, different widgets, content, variables to edit etc. About 10 different view types.

Now, as I see it, I could describe every particular view with it's properties in the DSL, so that I can create concrete UI menus in the .mydsl file.

However I'm interested if I can do it a step more abstract, so that the DSL does know there can be different views with possible properties (widgets), but it shall not define the actual combinations.

That way someone should be able to 1. Describe in the .mydsl file, what views are actually possible (e.g. "numeric editor" with one property "Variable" to edit) and afterwards 2. State that there are 10 actual numeric editor instances, editing variables a, b, c, ... Another customer might want to model an editor with three variables and only 2 actual instances.

"View" name=ID
"NumericEditor" is a View
"TemperatureSetpoint" is NumericEditor
"Brightness" is NumericEditor

If this approach is way to complicated, just say so.

I hope I explained it more clear this time. As I see it, part 1. Would be the meta model and 2. The model. And normally the DSL is the meta model and the .mydsl file is the concrete model?

Btw, what are the .mydsl files called? DSL instances?

Thank you very much for your patience and time!

Re: Model meta elements and their instances? [message #1809929 is a reply to message #1809927]

Thu, 25 July 2019 14:52

Eclipse User

DSL instances or simply models
for general topic:
I still don't see what the problem is with either having
One widget and one GUI / View dsl
Or a dsl with a widget and a GUI / View part

Re: Model meta elements and their instances? [message #1809930 is a reply to message #1809929]

Thu, 25 July 2019 14:57

Eclipse User

here is a very trivial example

Model:
classes+=Class*
instances*=Instance*;

Class: "class" name=ID "{" 
properties+=Property*
"}";

Property: name=ID;

Instance:
"inst" name=ID "of" clazz=[Class] "{"
propertyInstances+=PropertyInstance*
"}";

PropertyInstance: // TODO implement scoping for property
property=[Property] "=" value=STRING;

Re: Model meta elements and their instances? [message #1809932 is a reply to message #1809930]

Thu, 25 July 2019 15:31

Eclipse User

Ok thank you. Seems I'm overthinking it!

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