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In lugnet.cad.dat.models, John VanZwieten writes:
> In lugnet.cad.dat.models, Kevin Loch writes:
> > For some reason, the lines with exponents don't render in ldlite when
> > I use the dat hyperlink in web mode. ldlite,ldraw and l3p/povray
> > render them fine locally. I made it in MLcad. Is this a bug?
> > There is no need for e-15 exponents anyway so I substituted 0 for all
> > exponents. let's try it again.
>
> If not a bug, at least a nit. I think if you open the file in LDAO's
> editor, select the whole text and MoveExact by 1, then move it all back,
> LDAO will get rid of the exponents.
My bad. 'Twas a bug in the code in the ldraw.cgi script on the server which
recognized DAT content. It wasn't expecting 'e' exponents in numbers.
The old regex (just the non-type-0 portion):
/^ \s*
[1-5]
(?: \s+ [0-9]+ )
(?: \s+ \-? [0-9]* \.? [0-9]* ){6,12}
(?: \s+ \S+ \. [Dd][Aa][Tt] )?
\s* $
/x
The new regex (just the non-type-0 portion):
/^ \s*
[1-5]
(?: \s+ [0-9]+ )
(?: \s+ \-? [0-9]* (?: \. [0-9]* )? (?: [Ee] [\-\+]? [0-9]+ )? ){6,12}
(?: \s+ \S+ \. [Dd][Aa][Tt] )?
\s* $
/x
This is better in that it now accepts 'e' exponents, but it still gives
false positives on any malformed lines which it might encounter, for example
a type-2 line ending in ".DAT" or containing 13 arguments rather than 7, etc.
If anyone has a Perl5 regex which handles all styles of DAT-content lines
with no false positivies and which isn't non-understandably complex[1] and
doesn't do excessive backtracking, please send it my way!
Also, if anyone knows of any other "funny stuff" that Turbo Pascal might
embed on a line, I'd like to know that too. (Exponents aren't really "funny
stuff," but I was very surprised to see them output because so many DAT files
have the numbers chopped 2 or 3 places after the decimal point.)
--Todd
[1] for example, the 6598-byte long e-mail address regex in Appendix B of the
wise-owls book is something I'd call "non-understandably complex." :)
(followups to lugnet.cad.dev)
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Message has 1 Reply:
Message is in Reply To:
 | | Re: Datsville: crane2 (exponents?)
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| (...) If not a bug, at least a nit. I think if you open the file in LDAO's editor, select the whole text and MoveExact by 1, then move it all back, LDAO will get rid of the exponents. -John Van (25 years ago, 13-Sep-99, to lugnet.cad.dat.models)
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