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Groups > comp.compilers > #2571

Re: implementation languages, was Supporting multiple input syntaxes

Followups directed to: alt.folklore.computers

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On Monday, August 24, 2020 at 2:12:13 PM UTC-5, Thomas Koenig wrote:
> luser droog <mijoryx@yahoo.com.dmarc.email.dmarc.email.dmarc.email> schrieb:
>
> [PostScript]
>
> > But the language itself I just really enjoy. It's my "Lego blocks"
> > language. The RPN syntax removes all ambiguity about precedence and
> > sequencing.
>
> I recently had the doubtful pleasure of evaluating the formula
>
> x = ((a-b)*c^2+(-d^2+e^2-a^2+b^2)*c+a^2*b+(f^2-e^2-b^2)*a
>     +(-f^2+d^2)*b)/((-2*d+2*e)*c+(2*f-2*e)*a-2*b*(f-d))
>
> in Postscript.  (Yes, really.  Don't ask.)
>

In case you need it, I've got a PostScript debugger that can single
step into loops and procedures.

https://github.com/luser-dr00g/debug.ps

$ gsnd db5.ps
GPL Ghostscript 9.52 (2020-03-19)
Copyright (C) 2020 Artifex Software, Inc.  All rights reserved.
This software is supplied under the GNU AGPLv3 and comes with NO WARRANTY:
see the file COPYING for details.
GS>{ 0 0 1 5 { add } for } stepon traceon debug
 %|-
0  %|- 0
0  %|- 0 0
1  %|- 0 0 1
5  %|- 0 0 1 5
{add}  %|- 0 0 1 5 {add}
for nametype object for step: (continue|next|bypass|step|prompt|quit)?s
 %|- 0 0
add nametype object add step: (continue|next|bypass|step|prompt|quit)?
 %|- 0
1  %|- 0 1
1  %|- 0 1 1
5  %|- 0 1 1 5
{add}  %|- 0 1 1 5 {add}
for nametype object for step: (continue|next|bypass|step|prompt|quit)?
 %|- 0 1
add nametype object add step: (continue|next|bypass|step|prompt|quit)?
 %|- 1
2  %|- 1 2
1  %|- 1 2 1
5  %|- 1 2 1 5
{add}  %|- 1 2 1 5 {add}
for nametype object for step: (continue|next|bypass|step|prompt|quit)?
 %|- 1 2
add nametype object add step: (continue|next|bypass|step|prompt|quit)?
 %|- 3
3  %|- 3 3
1  %|- 3 3 1
5  %|- 3 3 1 5
{add}  %|- 3 3 1 5 {add}
for nametype object for step: (continue|next|bypass|step|prompt|quit)?
 %|- 3 3
add nametype object add step: (continue|next|bypass|step|prompt|quit)?
 %|- 6
4  %|- 6 4
1  %|- 6 4 1
5  %|- 6 4 1 5
{add}  %|- 6 4 1 5 {add}
for nametype object for step: (continue|next|bypass|step|prompt|quit)?
 %|- 6 4
add nametype object add step: (continue|next|bypass|step|prompt|quit)?
 %|- 10
5  %|- 10 5
1  %|- 10 5 1
5  %|- 10 5 1 5
{add}  %|- 10 5 1 5 {add}
for nametype object for step: (continue|next|bypass|step|prompt|quit)?
 %|- 10 5
add nametype object add step: (continue|next|bypass|step|prompt|quit)?
 %|- 15
6  %|- 15 6
1  %|- 15 6 1
5  %|- 15 6 1 5
{add}  %|- 15 6 1 5 {add}
for nametype object for step: (continue|next|bypass|step|prompt|quit)?
GS<1>==
15
GS>quit

[This is drifting rather far from compilers now. -John]

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Thread

Supporting multiple input syntaxes luser droog <mijoryx@yahoo.com.dmarc.email> - 2020-08-12 15:20 -0700
  Re: Supporting multiple input syntaxes Kaz Kylheku <793-849-0957@kylheku.com> - 2020-08-13 00:43 +0000
  Re: Supporting multiple input syntaxes Hans-Peter Diettrich <DrDiettrich1@netscape.net> - 2020-08-13 10:27 +0200
    Re: Supporting multiple input syntaxes luser droog <mijoryx@yahoo.com.dmarc.email> - 2020-08-13 21:36 -0700
    Re: Supporting multiple input syntaxes luser droog <mijoryx@yahoo.com.dmarc.email> - 2020-08-23 22:16 -0700
  Re: Supporting multiple input syntaxes minforth@arcor.de - 2020-08-13 14:15 -0700
    Re: Supporting multiple input syntaxes luser droog <mijoryx@yahoo.com.dmarc.email> - 2020-08-13 21:37 -0700
    RE: Supporting mulitple input syntaxes Christopher F Clark <christopher.f.clark@compiler-resources.com> - 2020-08-14 12:44 +0300
  Supporting multiple input syntaxes David Lovemore <davidlovemore@gmail.com> - 2020-08-15 06:42 -0700
    Re: Supporting multiple input syntaxes luser droog <mijoryx@yahoo.com.dmarc.email> - 2020-08-15 15:20 -0700
      Re: Supporting multiple input syntaxes David Lovemore <davidlovemore@gmail.com> - 2020-08-16 02:21 -0700
        Re: Supporting multiple input syntaxes luser droog <mijoryx@yahoo.com.dmarc.email> - 2020-08-20 14:45 -0700
          Re: Supporting multiple input syntaxes luser droog <mijoryx@yahoo.com.dmarc.email> - 2020-08-23 19:35 -0700
            Re: implementation languages, was Supporting multiple input syntaxes luser droog <mijoryx@yahoo.com.dmarc.email> - 2020-08-23 20:39 -0700
              Re: implementation languages, was Supporting multiple input syntaxes Thomas Koenig <tkoenig@netcologne.de> - 2020-08-24 17:01 +0000
                Re: implementation languages, was Supporting multiple input syntaxes luser droog <mijoryx@yahoo.com.dmarc.email> - 2020-08-28 10:56 -0700
              Re: stack languages, was Supporting multiple input syntaxes luser droog <mijoryx@yahoo.com.dmarc.email> - 2020-08-24 12:14 -0700
  Re: Supporting multiple input syntaxes gah4 <gah4@u.washington.edu> - 2020-08-23 14:26 -0700
  Re: Supporting multiple input syntaxes antispam@math.uni.wroc.pl - 2021-02-11 23:27 +0000
    Re: Supporting multiple input syntaxes Elijah Stone <elronnd@elronnd.net> - 2021-02-17 01:44 -0800
      Re: Supporting multiple input syntaxes antispam@math.uni.wroc.pl - 2021-02-23 23:28 +0000
        Re: Supporting multiple input syntaxes "ltc...@gmail.com" <ltcmelo@gmail.com> - 2021-03-14 21:08 -0400
  Re: Supporting multiple input syntaxes Rock Brentwood <rockbrentwood@gmail.com> - 2021-03-14 17:36 -0700

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