[antlr-interest] Incompatible type in subrules with OR

[Claudio Martella]

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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Tel. +39 0471 068 123
Fax  +39 0471 068 129
claudio.martella at tis.bz.it http://www.tis.bz.it

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