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Subject:	"Well-Formed" LDraw (Was: regular expressions for DAT file subpart lines)
Newsgroups:	lugnet.off-topic.geek, lugnet.cad.dev
Date:	Wed, 23 Jun 1999 22:09:53 GMT
Reply-To:	JSPROAT@GEOCITIESnospam.COM
Viewed:	649 times

Steve Bliss wrote: > Oops, I forgot a few other odd things. I *think* your expression allows > these, but I'm not sure: > .1 Nope, won't take a fraction w/o the integer part; gotta fix that > -.1 Nope, same reason as above > 0. Nope, won't take a fraction w/o the fraction part, gotta fix that > -0. Nope, same reason as above > 001 Yep! Woo-Hoo!!! :-, > 1E Nope, I can't even figure out what this is supposed to be without the mantissa! Is it just 1? The hard part about using a single regular expression to detect scientific notation is that it might allow things like "+.E." to represent a number, which any respectable atoi() would choke on. I gotta think about this some more, see if it's even worth my time at the moment... > BTW, the color-code can be in scientific notation. The line-type can't, at > least, it can't in LDLite. I'm betting LDraw would recognize 1E0 as a > valid line-type. Hmmm... But LEdit doesn't output scientific notation in these areas. I'm inclined to be more liberal than restrictive, but some of these cases don't make any sense; i.e. fractional colors. > What about line-breaks? LDraw allows those in the middle of the line. And > anything extra after the filename is ignored, I think. At least, on > line-types 2 through 5, anything after the last parameter and before a line > break is ignored. Arg. Broken lines would obviate a line-based parser. Pascal parsers tend to be character-based, while Perl makes it much easier to write line-based parsers. I wonder if we should start to differentiate between "valid" and "well-formed" LDraw files, a la XML...? Cheers, - jsproat -- Jeremy H. Sproat <jsproat@geocities.com> http://www.geocities.com/SiliconValley/Horizon/5249/ Darth Sideous the wicked ruled his world -- Sidious spoke in class today

Message has 1 Reply:

		Re: "Well-Formed" LDraw (Was: regular expressions for DAT file subpart lines)
(...) Both of the above are common output from LDAO code. (...) Well, I was just throwing stuff out. I don't know if LDraw would take that one, or not. (...) Darned context-sensitive constructions. (...) I didn't say they made sense. Just that they (...) (25 years ago, 24-Jun-99, to lugnet.off-topic.geek, lugnet.cad.dev)

Message is in Reply To:

		Re: regular expressions for DAT file subpart lines
Oops, I forgot a few other odd things. I think your expression allows these, but I'm not sure: .1 -.1 0. -0. 001 1E BTW, the color-code can be in scientific notation. The line-type can't, at least, it can't in LDLite. I'm betting LDraw would (...) (25 years ago, 23-Jun-99, to lugnet.off-topic.geek)

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