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Scoping and content assist relation [message #690803]

Thu, 30 June 2011 04:56

Eclipse User

I have a simple grammar below, but the content assist displays possibilities like 'include' under 'package'. Should I customize content assist or change the scoping? My impression was that scoping only applies to references a given context?

Model:
	package=PackageDeclaration;

PackageDeclaration:
	'package' name=QualifiedName '{'
	elements+=AbstractPackageElement*
	'}';

AbstractPackageElement:
	ModuleDeclaration | TestDeclaration;

ModuleDeclaration:
	'module' name=QualifiedName '{'
	properties+=Property* &
	elements+=AbstractModuleElement*
	'}';

AbstractModuleElement:
	Include | PreCompileOption | Type;

Include:
	'include' name=STRING;

Feeding this sample input, gives an error "missing '}' at 'module'". Naturally, it should complain about 'include' being in the wrong place.

package myPackge{
	include "inc"
	module myModule {
	}
}

Thanks for helping!

Re: Scoping and content assist relation [message #690918 is a reply to message #690803]

Thu, 30 June 2011 08:20

Eclipse User

Hi Balazs,

please be careful with the precedencies of &, | and sequential lists of
grammar elements. Your rule

ModuleDeclaration:
'module' name=QualifiedName '{'
properties+=Property* &
elements+=AbstractModuleElement*
'}';

should probably read like:

ModuleDeclaration:
'module' name=QualifiedName '{'
( properties+=Property* & elements+=AbstractModuleElement* )
'}';

Hope that helps,
Sebastian
--
Need professional support for Eclipse Modeling?
Go visit: http://xtext.itemis.com

On 30.06.11 10:56, Balazs Varnai wrote:
> I have a simple grammar below, but the content assist displays
> possibilities like 'include' under 'package'. Should I customize content
> assist or change the scoping? My impression was that scoping only
> applies to references a given context?
>
>
> Model:
> package=PackageDeclaration;
>
> PackageDeclaration:
> 'package' name=QualifiedName '{'
> elements+=AbstractPackageElement*
> '}';
>
> AbstractPackageElement:
> ModuleDeclaration | TestDeclaration;
>
> ModuleDeclaration:
> 'module' name=QualifiedName '{'
> properties+=Property* &
> elements+=AbstractModuleElement*
> '}';
>
> AbstractModuleElement:
> Include | PreCompileOption | Type;
>
> Include:
> 'include' name=STRING;
>
>
> Feeding this sample input, gives an error "missing '}' at 'module'".
> Naturally, it should complain about 'include' being in the wrong place.
>
>
> package myPackge{
> include "inc"
> module myModule {
> }
> }
>
>
> Thanks for helping!
>

Re: Scoping and content assist relation [message #690925 is a reply to message #690803]

Thu, 30 June 2011 08:33

Eclipse User

Hi Sebastian,

Thanks again! Now I get a lot of warnings like below. I guess my grammar smells bad.

Decision can match input such as "'property' RULE_ID RULE_ID" using multiple alternatives: 1, 2
As a result, alternative(s) 2 were disabled for that input
Semantic predicates were present but were hidden by actions.

Re: Scoping and content assist relation [message #690949 is a reply to message #690925]

Thu, 30 June 2011 08:53

Eclipse User

It's hard to tell what's wrong without your complete grammar. However,
AntlrWorks may help to spot the errors.

Regards,
Sebastian
--
Need professional support for Eclipse Modeling?
Go visit: http://xtext.itemis.com

On 30.06.11 14:33, Balazs Varnai wrote:
> Hi Sebastian,
>
> Thanks again! Now I get a lot of warnings like below. I guess my grammar
> smells bad.
>
> Decision can match input such as "'property' RULE_ID RULE_ID" using
> multiple alternatives: 1, 2
> As a result, alternative(s) 2 were disabled for that input
> Semantic predicates were present but were hidden by actions.
>

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