[rules-dev] Xtext and the Rete DSL.

[Mark Proctor]

On 08/11/2010 10:59, Wolfgang Laun wrote:
> What precisely do  you mean by "Rete DSL"?
> -W
I wrote a low level testing DSL for rete networks a while back:
http://blog.athico.com/2009/11/rete-dsl-testing-harness.html

Hmm the new blog template needs some work....

You can see the tests here:
http://anonsvn.jboss.org/repos/labs/labs/jbossrules/trunk/drools-core/src/test/resources/org/drools/reteoo/test/

The tests look a little like:

TestCase "Join Node assert/retract test case"

Setup
	ObjectTypeNode:
	    otnLeft1, org.drools.Person;
	LeftInputAdapterNode:
	    lian0, otnLeft1;
	ObjectTypeNode:
	    otnRight1, org.drools.Person;
	ObjectTypeNode:
	    otnRight2, org.drools.Person;
	Binding:
	     p1, 0, org.drools.Person, age;
	JoinNode:
	    join1, lian0, otnRight1;
	    age, !=, p1;
	JoinNode:
	    join2, join1, otnRight2;
	    age, !=, p1;
	Facts:
	    new org.drools.Person('darth', 35), new org.drools.Person('bobba', 36),
	    new org.drools.Person('yoda', 37), new org.drools.Person('luke', 38),
	    new org.drools.Person('dave', 33), new org.drools.Person('bob', 32);
	
Test "Assert/retract test"	
	/**
	 * check single left assertion and retraction
	 */
	assert:
	    otnLeft1, [h0];
	join1:
	    leftMemory, [[h0]];
	join2:
	    leftMemory, [];
	retract:
	    otnLeft1, [h0];
	/**
	 * check single right assertion and retraction
	 */
	assert:
	    otnRight1, [h1];
	join1:
	    rightMemory, [h1];
	join2:
	    leftMemory, [];
	retract:
	    otnRight1, [h1];
	
	/**
	 *  check single left then right assertion
	 */
	assert:
	    otnLeft1, [h0];
	    otnRight1, [h1];
	join1:
	    leftMemory, [[h0]];
	    rightMemory, [h1];
	join2:
	    leftMemory, [[h0, h1]];
	retract:
	    otnLeft1, [h0];
	    otnRight1, [h1];
	
	/**
	 *  check single right then left assertion
	 */
	assert:
	    otnRight1, [h1];
	    otnLeft1, [h0];
	join1:
	    leftMemory, [[h0]];
	    rightMemory, [h1]  ;
	join2:
	    leftMemory, [[h0, h1]];
	retract:
	    otnLeft1, [h0];


	    otnRight1, [h1];


>
> On 8 November 2010 11:33, Leonardo Gomes <leonardo.f.gomes at gmail.com 
> <mailto:leonardo.f.gomes at gmail.com>> wrote:
>
>     I've been using the Rete DSL a lot these days and was thinking
>     that it could be a good idea to provide some Eclipse
>     infra-structure (syntax highlighting, code completion, validation)
>     to it using Xtext (http://www.eclipse.org/Xtext/). It's built on
>     top of antlr, so maybe we could even reuse the grammar that we
>     already have. I know that, by default, you should right you
>     grammar using their simplified version.
>
>     Maybe the guys there would also be interested in providing
>     something to Drools. It could be a showcase for them.
>
>     Not sure if this also applies to the Eclipse DRL things that we have.
>
>     Cheers,
>     Leonardo.
>
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