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Re: Antwort: [HACKERS] ecpg parser

From: Michael Meskes <meskes(at)usa(dot)net>
To: "Thomas G(dot) Lockhart" <lockhart(at)alumni(dot)caltech(dot)edu>, Michael Meskes <Michael(dot)Meskes(at)usa(dot)net>
Cc: Postgres Hackers List <hackers(at)postgresql(dot)org>
Subject: Re: Antwort: [HACKERS] ecpg parser
Date: 1998-09-30 05:47:44
Message-ID: 19980930074744.A630@usa.net (view raw or flat)
Thread:
Lists: pgsql-hackers
On Tue, Sep 29, 1998 at 12:55:57PM +0000, Thomas G. Lockhart wrote:
> I haven't yet committed the changes to the source tree, but may have a
> chance to regression test and commit today. I'll send patches to you at
> the same time. btw, there was a missing comma between ADD and AS in the
> token list (I see the problem also in preproc.y) and I found one or two
> omissions in parser/keywords.c. Most of my changes were to fix omissions
> and to allow tokens to be column identifiers or column labels as much as
> possible.

I see. I will add your changes as soon as I find time.

> The other thing I'm doing is documenting the reserved and unreserved
> keywords (I'm most of the way there, and will commit a new file
> syntax.sgml to the docs tree soon). The only thing I've been looking at
> so far is gram.y. Are there any other keywords added to preproc.y? I see

Yes, there are some special embedded sql keywords like break, call,
whenever, etc. See ecpg/preproc/ecpg_keywords.c for details.

> that you did things so that EXEC and SQL are not required to be reserved
> words (I hadn't thought of how to do that; nice trick!), but perhaps

Thanks. :-)

> there are others which are. Shall we put all of the keywords used by
> either gram.y or preproc.y into gram.y and keywords.c to make it more
> consistant and to enforce consistancy in database design? SQL92 doesn't

At first I thought why making it a keyword when it doesn't have to. But the
more I think about it the more I like it. It just doesn't make sense to use
these keywords because that would force you to not use ecpg.

> OK, sorry. I'd put your address into my mailer, and hadn't notice the
> change.

No problem. But that way it will reach me no matter if I'm at home or in the
office.

Michael
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Subject: Patches for gram.y and keywords.c
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Subject: Re: [HACKERS] SQL92

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