Re: Another recognizer discussion

From	Lars Brinkhoff <lars.spam@nocrew.org>
Newsgroups	comp.lang.forth
Subject	Re: Another recognizer discussion
Organization	nocrew
References	(6 earlier) <2017Jun1.075057@mips.complang.tuwien.ac.at> <592fd139.668296177@news.eternal-september.org> <ogp6oc$fbd$1@dont-email.me> <hKydnVY_4s3asK3EnZ2dnUU7-WWdnZ2d@supernews.com> <2017Jun2.095932@mips.complang.tuwien.ac.at>
Date	2017-06-02 11:48 +0200
Message-ID	<86zidqk9dr.fsf@molnjunk.nocrew.org> (permalink)

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Anton Ertl writes:
> the FIND-based interpreter loop (as presented by Mitch Bradley
> in an email) is:
>
> |    ( c-addr )
> |    FIND  ?DUP  IF          ( xt +-1 )
> |       STATE @  IF            ( xt +-1 )
> |          0>  IF  EXECUTE  ELSE  COMPILE,  THEN  ( ??? )
> |       ELSE                        ( xt +-1 )
> |          DROP EXECUTE   ( ??? )
> |       THEN
> |    ELSE                        ( c-addr )
> |       ( whatever you do for an undefined word )
> |    THEN
>
> You can also try to combine some of the IFs, as attempted by Stephen Pelc
>
>>      find dup if
>>        state @ 0< and if
>>          compile,
>>      else
>>        execute
>>      then
>>    else
>>      drop  count undefined
>>    then
>
> But the complexity rears its ugly head, as demonstrated by the fact
> that this code is buggy.

In my (biased and subjective) opinition, it's possible to do better than
both of these.  My version has no IFs at all.  It's quite simple.

But really, the implementation details of the interpreter aren't that
important, are they?

Thread

Another recognizer discussion Alex <alex@rivadpm.com> - 2017-05-29 20:47 +0100
  Re: Another recognizer discussion Alex <alex@rivadpm.com> - 2017-05-29 20:57 +0100
    Re: Another recognizer discussion peter.m.falth@gmail.com - 2017-05-29 13:18 -0700
      Re: Another recognizer discussion Alex <alex@rivadpm.com> - 2017-05-29 22:47 +0100
      Re: Another recognizer discussion anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2017-05-30 07:43 +0000
    Re: Another recognizer discussion anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2017-05-30 07:30 +0000
    Re: Another recognizer discussion albert@cherry.spenarnc.xs4all.nl (Albert van der Horst) - 2017-05-30 09:53 +0200
    Re: Another recognizer discussion Alex <alex@rivadpm.com> - 2017-05-30 22:02 +0100
      Re: Another recognizer discussion peter.m.falth@gmail.com - 2017-05-31 01:27 -0700
        Re: Another recognizer discussion Alex <alex@rivadpm.com> - 2017-05-31 15:12 +0100
      Re: Another recognizer discussion minforth@arcor.de - 2017-05-31 03:43 -0700
        Re: Another recognizer discussion Alex <alex@rivadpm.com> - 2017-05-31 15:03 +0100
        Re: Another recognizer discussion anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2017-05-31 16:46 +0000
      Re: Another recognizer discussion anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2017-05-31 11:28 +0000
        Re: Another recognizer discussion anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2017-05-31 12:17 +0000
        Re: Another recognizer discussion Alex <alex@rivadpm.com> - 2017-05-31 15:10 +0100
          Re: Another recognizer discussion mhx@iae.nl - 2017-05-31 11:01 -0700
          Re: Another recognizer discussion stephen@mpeforth.com (Stephen Pelc) - 2017-05-31 22:55 +0000
            Re: Another recognizer discussion anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2017-06-01 05:50 +0000
              Re: Another recognizer discussion minforth@arcor.de - 2017-05-31 23:57 -0700
                Re: Another recognizer discussion anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2017-06-01 09:08 +0000
                Re: Another recognizer discussion minforth@arcor.de - 2017-06-01 03:33 -0700
              Re: Another recognizer discussion stephen@mpeforth.com (Stephen Pelc) - 2017-06-01 09:05 +0000
                Re: Another recognizer discussion Alex <alex@rivadpm.com> - 2017-06-01 15:05 +0100
                Re: Another recognizer discussion Andrew Haley <andrew29@littlepinkcloud.invalid> - 2017-06-01 10:05 -0500
                Re: Another recognizer discussion Alex <alex@rivadpm.com> - 2017-06-01 16:32 +0100
                Re: Another recognizer discussion Brad Eckert <hwfwguy@gmail.com> - 2017-06-01 09:31 -0700
                Re: Another recognizer discussion Alex <alex@rivadpm.com> - 2017-06-01 19:00 +0100
                Re: Another recognizer discussion stephen@mpeforth.com (Stephen Pelc) - 2017-06-04 22:56 +0000
                Re: Another recognizer discussion Alex <alex@rivadpm.com> - 2017-06-05 14:41 +0100
                Re: Another recognizer discussion Andrew Haley <andrew29@littlepinkcloud.invalid> - 2017-06-02 03:07 -0500
                Re: Another recognizer discussion anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2017-06-10 16:28 +0000
                Re: Another recognizer discussion Andrew Haley <andrew29@littlepinkcloud.invalid> - 2017-06-11 02:14 -0500
                Re: Another recognizer discussion anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2017-06-11 10:55 +0000
                Re: Another recognizer discussion Andrew Haley <andrew29@littlepinkcloud.invalid> - 2017-06-12 03:22 -0500
                Re: Another recognizer discussion anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2017-06-13 15:21 +0000
                Re: Another recognizer discussion Andrew Haley <andrew29@littlepinkcloud.invalid> - 2017-06-14 04:10 -0500
                Re: Another recognizer discussion anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2017-06-15 10:43 +0000
                Re: Another recognizer discussion Andrew Haley <andrew29@littlepinkcloud.invalid> - 2017-06-15 09:11 -0500
                Re: Another recognizer discussion minforth@arcor.de - 2017-06-14 02:55 -0700
                Re: Another recognizer discussion anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2017-06-14 10:19 +0000
                Re: Another recognizer discussion minforth@arcor.de - 2017-06-14 05:44 -0700
                Re: Another recognizer discussion stephen@mpeforth.com (Stephen Pelc) - 2017-06-14 14:27 +0000
                Re: Another recognizer discussion minforth@arcor.de - 2017-06-14 08:06 -0700
                Re: Another recognizer discussion stephen@mpeforth.com (Stephen Pelc) - 2017-06-14 16:36 +0000
                Re: Another recognizer discussion Brad Eckert <hwfwguy@gmail.com> - 2017-06-15 09:48 -0700
                Re: Another recognizer discussion stephen@mpeforth.com (Stephen Pelc) - 2017-06-15 17:18 +0000
                Re: Another recognizer discussion Alex <alex@rivadpm.com> - 2017-06-15 18:50 +0100
                Re: Another recognizer discussion stephen@mpeforth.com (Stephen Pelc) - 2017-06-15 19:22 +0000
                Re: Another recognizer discussion minforth@arcor.de - 2017-06-15 13:09 -0700
                Re: Another recognizer discussion Brad Eckert <hwfwguy@gmail.com> - 2017-06-15 13:43 -0700
                Re: Another recognizer discussion Lars Brinkhoff <lars.spam@nocrew.org> - 2017-06-15 22:55 +0200
                Re: Another recognizer discussion Alex <alex@rivadpm.com> - 2017-06-15 22:20 +0100
                pre-Rfd for smart word definition mechanism (was: Another ...) anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2017-06-16 17:04 +0000
                Re: pre-Rfd for smart word definition mechanism (was: Another ...) stephen@mpeforth.com (Stephen Pelc) - 2017-06-16 21:58 +0000
                Re: pre-Rfd for smart word definition mechanism (was: Another ...) JennyB <jennybrien@googlemail.com> - 2017-06-17 00:26 -0700
                Re: pre-Rfd for smart word definition mechanism (was: Another ...) minforth@arcor.de - 2017-06-17 01:18 -0700
                Re: pre-Rfd for smart word definition mechanism (was: Another ...) anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2017-06-17 15:24 +0000
                Re: pre-Rfd for smart word definition mechanism (was: Another ...) JennyB <jennybrien@googlemail.com> - 2017-06-17 12:29 -0700
                Re: pre-Rfd for smart word definition mechanism (was: Another ...) anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2017-06-18 12:29 +0000
                Re: pre-Rfd for smart word definition mechanism (was: Another ...) albert@cherry.spenarnc.xs4all.nl (Albert van der Horst) - 2017-06-18 16:47 +0200
                Re: pre-Rfd for smart word definition mechanism (was: Another ...) anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2017-06-17 10:20 +0000
                Re: Another recognizer discussion Brad Eckert <hwfwguy@gmail.com> - 2017-06-15 13:01 -0700
                Re: Another recognizer discussion anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2017-06-16 16:55 +0000
                Re: Another recognizer discussion stephen@mpeforth.com (Stephen Pelc) - 2017-06-16 17:40 +0000
                Re: Another recognizer discussion anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2017-06-16 16:47 +0000
                Re: Another recognizer discussion Brad Eckert <hwfwguy@gmail.com> - 2017-06-15 10:34 -0700
                Re: Another recognizer discussion anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2017-06-17 17:35 +0000
                Re: Another recognizer discussion peter.m.falth@gmail.com - 2017-06-17 15:24 -0700
                Re: Another recognizer discussion anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2017-06-18 12:00 +0000
                Re: Another recognizer discussion anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2017-06-16 12:29 +0000
                Re: Another recognizer discussion anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2017-06-16 07:35 +0000
                Re: Another recognizer discussion stephen@mpeforth.com (Stephen Pelc) - 2017-06-11 10:39 +0000
                Re: Another recognizer discussion Richard Owlett <rowlett@cloud85.net> - 2017-06-11 07:19 -0500
                Re: Another recognizer discussion anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2017-06-13 14:04 +0000
                Re: Another recognizer discussion stephen@mpeforth.com (Stephen Pelc) - 2017-06-14 12:50 +0000
                Re: Another recognizer discussion anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2017-06-15 16:19 +0000
                Re: Another recognizer discussion anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2017-06-02 07:59 +0000
                Re: Another recognizer discussion Lars Brinkhoff <lars.spam@nocrew.org> - 2017-06-02 11:48 +0200
                Re: Another recognizer discussion anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2017-06-02 10:24 +0000
                Re: Another recognizer discussion Lars Brinkhoff <lars.spam@nocrew.org> - 2017-06-02 13:04 +0200
                Re: Another recognizer discussion anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2017-06-02 13:30 +0000
                Re: Another recognizer discussion Lars Brinkhoff <lars.spam@nocrew.org> - 2017-06-02 16:36 +0200
                Re: Another recognizer discussion anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2017-06-02 15:51 +0000
                Re: Another recognizer discussion Lars Brinkhoff <lars.spam@nocrew.org> - 2017-06-02 21:09 +0200
                Re: Another recognizer discussion anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2017-06-01 15:55 +0000
                Re: Another recognizer discussion anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2017-06-01 14:21 +0000
                Re: Another recognizer discussion stephen@mpeforth.com (Stephen Pelc) - 2017-06-04 23:07 +0000
                Re: Another recognizer discussion anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2017-06-10 15:49 +0000
                Re: Another recognizer discussion stephen@mpeforth.com (Stephen Pelc) - 2017-06-11 11:14 +0000
                Re: Another recognizer discussion minforth@arcor.de - 2017-06-11 08:24 -0700
                Re: Another recognizer discussion anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2017-06-13 15:07 +0000
            Re: Another recognizer discussion Alex <alex@rivadpm.com> - 2017-06-01 12:11 +0100
  Re: Another recognizer discussion Matthias Trute <matthias.trute@gmail.com> - 2017-05-30 11:03 -0700

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