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| Re: Assertion failed for unordered group [message #1712153 is a reply to message #1712135] |
Wed, 21 October 2015 14:46   |
 Sebastian Zarnekow
Messages: 3118
Registered: July 2009 |
Senior Member |
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On 21.10.15 15:24, Anakreontas Mentis wrote:
> I have one or more comma separated attributes where each one occurs at
> most once. The following rule encodes my requirements:
>
> EqPanel : (',' 'HEIGHT' '=' NUM)
> & (',' 'NAME' '=' tag = idstring)
> & (',' 'TITLE' '=' title = idlike)
> & (',' 'WIDTH' '=' width = NUM)
> & (',' 'XPOS' '=' NUM)
> & (',' 'YPOS' '=' NUM)
> ;
>
>
> XText does not produce any warnings during compilation but at runtime I
> get the error message:
> Rule ruleEqPanel failed predicate getUnorderedGroupHelper.canLeave(.....)
>
> I don't understand what causes the error. The grammar is not ambiguous
> as far as I can tell.
Your grammar does not specify that each attribute occurs at most once
but exactly once. You have to mark the optional parts as optional ;)
EqPanel : (',' 'HEIGHT' '=' NUM)?
& (',' 'NAME' '=' tag = idstring)?
& (',' 'TITLE' '=' title = idlike)?
& (',' 'WIDTH' '=' width = NUM)?
& (',' 'XPOS' '=' NUM)?
& (',' 'YPOS' '=' NUM)?
;
Best,
Sebastian
--
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