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How should I write an Xtext rule that refers to itself? [message #1828679]

Tue, 16 June 2020 13:25

Vinicius Costa e Silva

Messages: 1
Registered: June 2020

Junior Member

Hello! I'm a beginner with Xtext and I've been tasked with writing a DSL that accepts rules in the following format (that I call events):

instance: def(parameter);
gen: key = def(parameter);

I've written a simple grammar that accepts events like this:

eventType:
	event=ID (":" | "=") method = ID"("object=ID")"  ";"
;

This rule accepts both instance: def(parameter); or key = def(parameter); . But I'm unable to write a rule for this event type that refers back to itself, so I could write something like:

gen: key = def(parameter);

The way I imagine it, I would need to assign an eventType back to the method field, kind like a recursion.

Any tips on how could I accomplish that?

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Re: How should I write an Xtext rule that refers to itself? [message #1828746 is a reply to message #1828679]

Thu, 18 June 2020 04:56

Ed Willink

Messages: 7655
Registered: July 2009

Senior Member

Hi

The standard example is expressions. See the Xtext Arithmetics example.

Regards

Ed Willink

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