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Check if a language/grammar file is defined twice in Workspace [message #1816430]

Tue, 29 October 2019 12:36

Mehmetcan Sinir

Messages: 55
Registered: September 2018

Member

Hi,

We have a Visual Studio Code language extension written in Xtext. We need to make sure that certain grammar files (with certain extensions) are defined only once inside the workspace, and if not show a validation error.

Is there perhaps an easy way to do this with XText?

Thanks a lot

[Updated on: Tue, 29 October 2019 12:37]

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Re: Check if a language/grammar file is defined twice in Workspace [message #1816627 is a reply to message #1816430]

Fri, 01 November 2019 17:58

Christian Dietrich

Messages: 14716
Registered: July 2009

Senior Member

hi, i am not sure if i get your problem
what makes a file "defined twice"
you do you mean something like:

there should be only one

"Hello World!" in all mydsl files in the project?

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

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Re: Check if a language/grammar file is defined twice in Workspace [message #1816637 is a reply to message #1816627]

Sat, 02 November 2019 07:33

Uli Merkel

Messages: 250
Registered: June 2013

Senior Member

This is a job for the validator.

Lorenzo Bettini found a very simple to understand implementation

Source: https://github.com/LorenzoBettini/packtpub-xtext-book-examples/blob/master/org.example.smalljava/src/org/example/smalljava/validation/SmallJavaValidator.xtend

@Check
def void checkNoDuplicateMember(SJMember member) {
val duplicate = member.containingClass.members.findFirst[
it != member && it.eClass == member.eClass &&
it.name == member.name
]
if (duplicate != null)
error("Duplicate member '" + member.name + "'",
SmallJavaPackage::eINSTANCE.SJMember_Name,
DUPLICATE_ELEMENT
)
}

HIH, Uli

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