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Xtext with other AST generators [message #1786831]

Sun, 13 May 2018 16:32

Chester John

Messages: 1
Registered: May 2018

Junior Member

Is it possible to use other generators of AST's than Antlr?
If so what is the Java interface for those AST's?
I have a requirement to machine generate them and use the results in XText.
Is this even reasonable?

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Re: Xtext with other AST generators [message #1786876 is a reply to message #1786831]

Mon, 14 May 2018 16:46

Christian Dietrich

Messages: 12360
Registered: July 2009

Senior Member

What do you mean by „use"

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Re: Xtext with other AST generators [message #1786877 is a reply to message #1786876]

Mon, 14 May 2018 17:10

Ed Willink

Messages: 6109
Registered: July 2009

Senior Member

Hi

Your terminology is confusing. ANTLR uses a grammar not an AST. The unique contribution of Xtext is to link the maintenance of the AST to the grammar production rules and also do serialization and editing. The AST is a fairly standard Ecore model; I'm not clear why you would want something else.

There are grammar alternatives, but if you want an editor, Xtext has comprehensive facilities.

If you only want a parser, or want a smaller/faster parser then other options may be better. I have done some preliminary work on Xtext2LPG which you may find at http://git.eclipse.org/c/ocl/org.eclipse.ocl.git/tree/examples/org.eclipse.ocl.examples.xtext2lpg with the original intention of getting proper shift/reduce diagnostics of backtracking hazards; and one day getting better performance. See http://www.eclipse.org/modeling/mdt/ocl/docs/publications/MODELS2010OCLWorkshop/oclxtext.pdf

Regards

Ed Willink

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