Re: [rules-dev] RFC: declaration syntax

On 26 July 2011 21:28, Edson Tirelli <ed.tirelli(a)gmail.com&gt; wrote: > QUESTION: > As we can see above, we will need several new constructs in order to > support features in our roadmap. We have the choice of making them all top > level constructs, making the error recovery in the parser a lot more > complicated, or we can re-use our declare construct to define these new > structures as I presented in the pseudo-code above. Any pros/cons you can > see in such approach? > > I doubt the "a lot more complicated". I'd much rather have a "natural language" with a lean syntax than the cobol-ish agglomeration of keywords. Structured/syntax assisted editing should take care of gross errors so that recovery isn't as important as without these aids. I vote for OPTION 2. I'm very much against OPTION 3. Wolfgang > OPTION 1 (more verbose, but simpler and more stable): > <epDeclaration> ::= declare entry-point <epName> [, <epName]* > <windowDeclaration> ::= declare window <windowName> > <restOfTheWindowDeclaration> end > <typeDeclaration> ::= declare [type] <typeName> <restOfTheTypeDeclaration> > end > > OPTION 2 (makes error recovery harder, but it is less verbose): > <epDeclaration> ::= entry-point <epName> [, <epName]* > <windowDeclaration> ::= window <windowName> <restOfTheWindowDeclaration> > end > <typeDeclaration> ::= declare <typeName> <restOfTheTypeDeclaration> end > > OPTION 3: > <epDeclaration> ::= someOtherKeyword entry-point <epName> [, <epName]* > <windowDeclaration> ::= someOtherKeyword window <windowName> > <restOfTheWindowDeclaration> end > <typeDeclaration> ::= declare [type] <typeName> <restOfTheTypeDeclaration> > end > > > Edson > > -- > Edson Tirelli > JBoss Drools Core Development > JBoss by Red Hat @ www.jboss.com > > _______________________________________________ > rules-dev mailing list > rules-dev(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-dev > > _______________________________________________ rules-dev mailing list rules-dev(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-dev