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Avoiding keywords in model properties [message #1760226]

Mon, 24 April 2017 19:47

Sina Madani

Messages: 66
Registered: November 2015
Location: York, UK

Member

Hello,

I was wondering if there is a way to get the property of a model in Epsilon languages if the metamodel element name is the same as a keyword?
For example, in EVL I have the following code:

context Movie {
constraint isValidTitle {
check: self.title.length() > 0
}
}

The problem is that "title" is a keyword in EVL and the parser treats it as a keyword. I was unable to find a "getProperty" operation on model elements in the book (there is a "hasProperty" on Any but no way to retrieve the property that I could find).

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Re: Avoiding keywords in model properties [message #1760227 is a reply to message #1760226]

Mon, 24 April 2017 19:59

Bugra M. Yildiz

Messages: 106
Registered: July 2014

Senior Member

This is a typical problem I also had before. You can use

<model element name>.`<property name>`

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Re: Avoiding keywords in model properties [message #1760228 is a reply to message #1760227]

Mon, 24 April 2017 20:29

Sina Madani

Messages: 66
Registered: November 2015
Location: York, UK

Member

Thanks! Just out of interest, is this documented anywhere in the book or any of the articles?

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Re: Avoiding keywords in model properties [message #1760231 is a reply to message #1760228]

Mon, 24 April 2017 21:26

Bugra M. Yildiz

Messages: 106
Registered: July 2014

Senior Member

I don't remember seeing it in the book. It is better Dimitris answers this question.

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Re: Avoiding keywords in model properties [message #1760248 is a reply to message #1760231]

Tue, 25 April 2017 08:06

Dimitris Kolovos

Messages: 1579
Registered: July 2009
Location: York, UK

Senior Member

Hi both,

An example of using backticks is shown in Figure 10.3 ("Flock migration strategy for the process-oriented metamodel...") of the book and explained in the footnote on page 149 (not the most prominent of places - I agree).

Cheers,
Dimitris

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Re: Avoiding keywords in model properties [message #1760263 is a reply to message #1760248]

Tue, 25 April 2017 09:18

Sina Madani

Messages: 66
Registered: November 2015
Location: York, UK

Member

Thanks Dimitris. Would it be useful if I wrote an article about it (under the "Epsilon Object Language" section) to make this feature more visible?

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Re: Avoiding keywords in model properties [message #1760265 is a reply to message #1760263]

Tue, 25 April 2017 09:20

Dimitris Kolovos

Messages: 1579
Registered: July 2009
Location: York, UK

Senior Member

Hi Sina,

This is also mentioned in https://www.eclipse.org/epsilon/doc/articles/eol-syntax-updates/. How about contributing a patch for the book?

Cheers,
Dimitris

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