Try the following options.
1.
locationStep: edge condition? (repeat | shortestPath)? ('>' locationStep)?
-> ^(LOCATIONSTEP condition? repeat? shortestPath? locationStep?);
condition: ( filter | subquery ) condition?
-> ^(CONDITION filter? subquery? condition?);
or
2.
locationStep
: edge condition? repeat? ('>' locationStep)? -> ^(LOCATIONSTEP
condition? shortestPath? locationStep?)
| edge condition? shortestPath? ('>' locationStep)? ->
^(LOCATIONSTEP condition? shortestPath? locationStep?)
;
condition
: filter condition? -> ^(CONDITION filter condition?)
| subquery condition? -> ^(CONDITION subquery condition?)
;
Regards
Gary
On Thu, Jul 21, 2011 at 9:16 PM, Claudio Martella
<[email protected]> wrote:
> Hello,
>
> I've this grammar: http://pastebin.com/dNzdGx8R but i get this error
> when I test it with AntlrWorks:
>
> [11:23:59] /Users/hammer/output/RDFPathParser.java:383: incompatible types
> [11:23:59] found : RDFPathParser.repeat_return
> [11:23:59] required: RDFPathParser.shortestPath_return
> [11:23:59] v=repeat();
> [11:23:59] ^
> [11:23:59] /Users/hammer/output/RDFPathParser.java:586: incompatible types
> [11:23:59] found : RDFPathParser.filter_return
> [11:23:59] required: RDFPathParser.subquery_return
> [11:23:59] v=filter();
> [11:23:59] ^
> [11:23:59] 2 errors
>
>
> Basically I think the problem is the assignment in the subrules with ORs
> in two statements:
>
> locationStep: edge condition? (v=repeat | v=shortestPath)? ('>'
> locationStep)?
> -> ^(LOCATIONSTEP condition $v locationStep);
>
> condition: ( v=filter | v=subquery ) condition?
> -> ^(CONDITION $v condition);
>
> How do I handle these situations where I have the two or more options in
> a subrule?
>
>
> Thanks
> Claudio
>
> --
> Claudio Martella
> Free Software & Open Technologies
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>
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