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Replacing XText expressions with external Java (or other language) code? [message #1697415]

Wed, 03 June 2015 17:38

Jiaju Shen

Messages: 5
Registered: June 2015

Junior Member

Hi I am a XText newbie.

When I was designing DSL for my project, I was wondering the performance of XText and DSL interface, especially when the grammar gets complicated and number of selections in autocomplete gets higher.

Let's take this scenario as an example:

Model: greetings+=Greeting*;

Greeting: 
        'String1' | 'String2' | 'String3' |'String4'             //How to replace this chunk with 1000 similar strings?
;

But if I want to test the performance I would like to put thousands of "StringX" in order to see the result.
I am wondering if there is a way to see how the program works by replacing XText expressions with some smarter tools (like putting 1000 random generated strings by Java)?

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Re: Replacing XText expressions with external Java (or other language) code? [message #1697417 is a reply to message #1697415]

Wed, 03 June 2015 18:14

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

Hi,

generally it is a bad idea to tie everything into grammar.
what about using validation and/or a libary approach?

e.g:

Greeting:
value=ID
;

+ Adaption of Validator and ProposalProvider

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

[Updated on: Wed, 03 June 2015 18:27]

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Re: Replacing XText expressions with external Java (or other language) code? [message #1697508 is a reply to message #1697417]

Thu, 04 June 2015 13:24

Jiaju Shen

Messages: 5
Registered: June 2015

Junior Member

What ways can I use in terms of validation and/or a libary approach?
I agree in my case, the need to implement complicated rules makes writing grammar cumbersome.
When you mentioned validation or library, what tools can I use? Are there any tutorials?

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Re: Replacing XText expressions with external Java (or other language) code? [message #1697510 is a reply to message #1697508]

Thu, 04 June 2015 13:45

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

Hi have look at xtext docs and tutorial. It covers validation. Even the hello world example has a validation rule you simply need to uncomment.

With libary approach i mean.

In one part ofthe dsl you define the stuff that is available in another part you use it.
Since your initial question is hypotetical so i cannot tell if libary approch suits you usecase or not.
Model: defs+=Def*|use+=Use*;

Def: "def" name=ID;
Use: defRef=[Def];

Use would replace your greeting.
You ship/put next to
a file that contains defs for String1 to String1000
And can use themin your model file

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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Re: Replacing XText expressions with external Java (or other language) code? [message #1697514 is a reply to message #1697508]

Thu, 04 June 2015 14:15

Ed Willink

Messages: 7655
Registered: July 2009

Senior Member

Hi

http://help.eclipse.org/luna/index.jsp?topic=%2Forg.eclipse.ocl.doc%2Fhelp%2FCompleteOCLTutorial.html&cp=40_3_1_9&anchor=CompleteOCLTutorial-XtextComplements

demonstrates how OCL can be used to add validation to Xtext.

Regards

Ed Willink

On 04/06/2015 14:24, Jiaju Shen wrote:
> What ways can I use in terms of validation and/or a libary approach?
> I agree in my case, the need to implement complicated rules makes
> writing grammar cumbersome.
> When you mentioned validation or library, what tools can I use? Are
> there any tutorials?
>

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