Re: implementation languages, was Supporting multiple input syntaxes

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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