[antlr-interest] Incompatible type in subrules with OR

[Gary Miller]

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
<claudio.martella at tis.bz.it> 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
> Analyst
>
> TIS innovation park
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