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Converting someone else's grammar style [message #650760]

Wed, 26 January 2011 12:38

David Wynter

Messages: 4624
Registered: July 2009

Senior Member

Hi,

I am attempting to make a XText grammar out of the grammar published
here http://nrl.sourceforge.net/spec/spec-nrl-20100407.html#concr ete-syntax

I converted it to XText grammar but their grammar uses these 'hints'
that look like they define a hint to the parser about the basic type of
node being processed. Here is an example

ValidationFragmentApplication : fragmentId:FragmentName
OperatorParameterList;
CollectionIndex : OrdinalNumber ("of")? collection:ModelReference;
ModelReference : (PackageReference)?
elementOrAttribute::ModelElementName ((("." | "of" )
attribute:ModelElementName)*)*;

Note the "fragmentId:", the "collection:", the "elementOrAttribute:" and
the "attribute:"

Not quite sure how to represent these in XText xtext file. Any pointers?

Thx.

David

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Re: Converting someone else's grammar style [message #650783 is a reply to message #650760]

Wed, 26 January 2011 14:16

Sebastian Zarnekow

Messages: 3118
Registered: July 2009

Senior Member

Hi David,

please have a look at the documentation section on cross references.
Something like
attribute=[ModelElementName] or attribute+=[ModelElementName]* should do
the trick.

Regards,
Sebastian
--
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Am 26.01.11 13:38, schrieb David Wynter:
> Hi,
>
> I am attempting to make a XText grammar out of the grammar published
> here http://nrl.sourceforge.net/spec/spec-nrl-20100407.html#concr ete-syntax
>
> I converted it to XText grammar but their grammar uses these 'hints'
> that look like they define a hint to the parser about the basic type of
> node being processed. Here is an example
>
> ValidationFragmentApplication : fragmentId:FragmentName
> OperatorParameterList;
> CollectionIndex : OrdinalNumber ("of")? collection:ModelReference;
> ModelReference : (PackageReference)?
> elementOrAttribute::ModelElementName ((("." | "of" )
> attribute:ModelElementName)*)*;
>
> Note the "fragmentId:", the "collection:", the "elementOrAttribute:" and
> the "attribute:"
>
> Not quite sure how to represent these in XText xtext file. Any pointers?
>
> Thx.
>
> David

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Re: Converting someone else's grammar style [message #650812 is a reply to message #650783]

Wed, 26 January 2011 16:44

David Wynter

Messages: 4624
Registered: July 2009

Senior Member

On 26/01/11 14:16, Sebastian Zarnekow wrote:
> Hi David,
>
> please have a look at the documentation section on cross references.
> Something like
> attribute=[ModelElementName] or attribute+=[ModelElementName]* should do
> the trick.
>
> Regards,
> Sebastian
That is not what I read it as. I read it that the prefix was qualifying
the term to indicate that it is of a particular type, a collection or an
attribute or an element. So figured I needed to create specific terms
that include type information. Like so.

ValidationFragmentApplication : FragmentNameId OperatorParameterList;
CollectionIndex : OrdinalNumber ("of")? ModelCollectionReference;
ModelReference : (PackageReference)?
ModelElementOrAttributeName ((("." | "of" )
ModelAttributeName)*)*;

In other words introduce specific terms for the different types of data
construct (Element, Attribute, Identifier collection and Collection).

Sound reasonable?

Thx.

David

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