Postgres Pro
Downloads
Home   >   mailing lists

Thread: GRAM.Y help..............

GRAM.Y help..............

From
Chris Bitmead
Date:
Can anyone help me remove the shift/reduce conflicts from the syntax? It
works perfectly, but since you guys won't accept shift/reduce
conflicts....

-------- Original Message --------
Subject: [HACKERS] gram.y help, ONLY syntax
Date: Sat, 27 May 2000 14:13:00 +1000
From: Chris Bitmead <chris@bitmead.com>
To: Postgres Hackers List <hackers@postgreSQL.org>


I've made changes to gram.y to reduce the conflicts down to a couple of
harmless shift/reduce conflicts, but I don't seem to have the right
black-magic incantations to remove these last ones. They seem to be
related to ONLY syntax. Can anybody help?


ftp://ftp.tech.com.au/pub/gram.y.gz
ftp://ftp.tech.com.au/pub/y.output.gz
ftp://ftp.tech.com.au/pub/patch.only.gz

Re: GRAM.Y help..............

From
Fredrik Estreen
Date:
Hi,

does your patch still work if you make ONLY a ColLabel and not a
TokenId, this would lead to ONLY not being a ColId and by that
removing all unresolvable conflicts in the grammar? This patch
against your gram.y does this. I have tested it with bison 1.27,
and verified that the conflicts are gone, but I have not tested
it for correct behavior in postgres. I did not have the time to
understand the whole grammar so I might have missed something
obvious.

Regards,
Fredrik Estreen

Chris Bitmead wrote:
>
> Can anyone help me remove the shift/reduce conflicts from the syntax? It
> works perfectly, but since you guys won't accept shift/reduce
> conflicts....
>
> -------- Original Message --------
> Subject: [HACKERS] gram.y help, ONLY syntax
> Date: Sat, 27 May 2000 14:13:00 +1000
> From: Chris Bitmead <chris@bitmead.com>
> To: Postgres Hackers List <hackers@postgreSQL.org>
>
> I've made changes to gram.y to reduce the conflicts down to a couple of
> harmless shift/reduce conflicts, but I don't seem to have the right
> black-magic incantations to remove these last ones. They seem to be
> related to ONLY syntax. Can anybody help?
>
> ftp://ftp.tech.com.au/pub/gram.y.gz
> ftp://ftp.tech.com.au/pub/y.output.gz
> ftp://ftp.tech.com.au/pub/patch.only.gz*** gram.y.orig    Tue Jun  6 20:32:27 2000
--- gram.y    Tue Jun  6 20:38:14 2000
***************
*** 5446,5452 ****
          | NOTIFY                        { $$ = "notify"; }
          | OF                            { $$ = "of"; }
          | OIDS                            { $$ = "oids"; }
-         | ONLY                            { $$ = "only"; }
          | OPERATOR                        { $$ = "operator"; }
          | OPTION                        { $$ = "option"; }
          | PARTIAL                        { $$ = "partial"; }
--- 5446,5451 ----
***************
*** 5584,5589 ****
--- 5583,5589 ----
          | NUMERIC                        { $$ = "numeric"; }
          | OFFSET                        { $$ = "offset"; }
          | ON                            { $$ = "on"; }
+         | ONLY                            { $$ = "only"; }
          | OR                            { $$ = "or"; }
          | ORDER                            { $$ = "order"; }
          | OUTER_P                        { $$ = "outer"; }

Re: GRAM.Y help..............

From
Chris Bitmead
Date:
Fredrik Estreen wrote:

> does your patch still work if you make ONLY a ColLabel and not a
> TokenId,

You're a genius!

I'm re-submitting this OO patch... Did the 7.1 tree start yet?

ftp://ftp.tech.com.au/pub/patch.only.gz

--
Chris Bitmead
mailto:chris@bitmead.com

Re: [PATCHES] Re: GRAM.Y help..............

From
Bruce Momjian
Date:
> Fredrik Estreen wrote:
>
> > does your patch still work if you make ONLY a ColLabel and not a
> > TokenId,
>
> You're a genius!
>
> I'm re-submitting this OO patch... Did the 7.1 tree start yet?

Yes.

--
  Bruce Momjian                        |  http://www.op.net/~candle
  pgman@candle.pha.pa.us               |  (610) 853-3000
  +  If your life is a hard drive,     |  830 Blythe Avenue
  +  Christ can be your backup.        |  Drexel Hill, Pennsylvania 19026