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Yacc to Xtext [message #1818192]

Tue, 10 December 2019 06:13

Virag Purnam

Messages: 130
Registered: June 2014

Senior Member

Hi,

I have a Yacc file, where grammar rules are written.
I want to create a Xtext file with similar rules.
Is there any conversion tool / Script available ? I want to reduce the manual effort writing rules again in Xtext format.

Please guide me.

Thanks and regards,
Virag

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Re: Yacc to Xtext [message #1818193 is a reply to message #1818192]

Tue, 10 December 2019 06:31

Christian Dietrich

Messages: 13643
Registered: July 2009

Senior Member

I don't know any tool
And LL vs LALR as internals of antlr vs yacc
Nay give you some trouble

Need professional support for Xtext, Xpand, EMF?
Go to: https://www.itemis.com/en/it-services/methods-and-tools/xtext
Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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Re: Yacc to Xtext [message #1818194 is a reply to message #1818193]

Tue, 10 December 2019 06:33

Tamas Miklossy

Messages: 114
Registered: February 2016

Senior Member

See also previous discussion in https://www.eclipse.org/forums/index.php/t/1068674/

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Re: Yacc to Xtext [message #1818203 is a reply to message #1818194]

Tue, 10 December 2019 08:29

Ed Willink

Messages: 6880
Registered: July 2009

Senior Member

Hi

Xtext is much much more than yacc [1]. The ability to integrate with an EMF model and so autogenerate an editor is very very powerful. Unless you have a 100 yacc grammars to migrate to Xtext and so can justify the effort of developing an analyzer for yacc actions, I recommend just cutting and pasting, probably starting with the smallest subset of the grammar that can be useful to gain confidence before expanding to more and more and rewriting the left recursions as * repeats.

Regards

Ed Willink

[1] Although for grammar checking I prefer 'yacc' or rather LPG and sometimes use GIT\org.eclipse.ocl\examples\org.eclipse.ocl.examples.xtext2lpg to check my Xtext grammars.

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