Re: [HACKERS] shift/reduce problem with ecpg

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От Michael Meskes
Тема Re: [HACKERS] shift/reduce problem with ecpg
Дата
Msg-id 199804211034.MAA11806@gauss.topsystem.de
обсуждение исходный текст
Ответ на Re: [HACKERS] shift/reduce problem with ecpg  ("Thomas G. Lockhart" <lockhart@alumni.caltech.edu>)
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Thomas G. Lockhart writes:
> Yes. If you really want to allow zero, one, or two colons, and only that
> number, then you can explicitly define those cases and separate them out
> from the a_expr syntax except as an argument. Look in gram.y for
> "b_expr" which accomplishes a similar thing for the BETWEEN operator.
> For that case, the AND usage was ambiguous since it can be used for
> boolean expressions and is also used with the BETWEEN operator.

Thanks Thomas. I've created a c_expr to be used in opt_indirection. Since
indicators don't make sense in this position only variables may be entered
here.

Michael

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