I really need to do that because other software, think Gerber, would
like to read the same file so that they will operate with the same data.

I can probably get what I want by writing a perl5 script that generates
the entire program file for use by OpenSCAD and it might also help with
those variables that can't be changed. But it would take a bunch of
programming time and it would require a complete restart of OpenSCAD
with no neat sensing of a save executed from an editor.

My perl5 code is creating Gerber files for the circuit boards and they
read a text file of parameters as they start up. The files are easily
changed with any old word processor like gedit. All they contain are
lines of text containing a name, a value, and comments. I can put them
into a mail message.

Perhaps an execution from a shell command line that would allow for a
read from a file name or standard-in when commanded by a read request at
the start of it's almost-C text.

Yeah, I admit I started in the 60's with a card punch and I'd rather use
a shell than try to understand button poking to find a file. Sorry.

So, what are you asking for?  A parser in OpenSCAD to read that file?  I
think someone was saying that they have a rudimentary parser somewhere on
this forum.

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Depending what you want to do with the 'data', you can

include<some_file>

That file could have either a list of assignments;

len=10;
wide=20;

or if it is a list you could top/tail with, eg;

list=[
10,
20,  // you can have comments
30,
];

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