Subject:
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Re: MPD file loading search order
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Newsgroups:
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lugnet.cad.dev
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Date:
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Tue, 25 Jul 2006 20:28:21 GMT
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Viewed:
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2112 times
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Travis Cobbs wrote:
>
>
> I mentioned in my other (long) post that I don't think that MPD files should be
> required to have a .mpd extension. However, I'd like to add more here in answer
> to your specific question.
>
> I could be wrong, but I'm almost positive that it is impossible to load an MPD
> file in one pass. The reason for this is that files defined inside the MPD are
> guaranteed to come after lines in the file that reference those files.
> Remember, the main model of an MPD is always the first thing in the file. Since
> it's presumably going to reference wrapped files, those wrapped files are
> guaranteed to show up after the lines in the main model that reference the
> wrapped files. I don't see how this can be handled in one pass.
>
> (Oh, and you can't be cute and load the file backwards, because there's nothing
> in the MPD spec that specifies any inherent order in the contained files. So
> references can go either direction.)
>
> Mind you, you don't have to actually read the file twice. LDView stores the
> entire contents of the file in an array of strings (each of which represents one
> line in the file) on its first pass, and then parses those lines on the second
> pass. But I really don't see any way of avoiding two passes through the data.
>
> --Travis
You can do it in one pass (if you don't count the loading of the file to
a stringlist).
Wile walking through the file you build you're objectlist with subparts.
Afterwards you go recursively through the list of subparts. This way all
mpd subparts are loaded before processing the mainpart.
But you could call the processing of the resulting subpart object list
the second pass :)
Roland
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Message has 1 Reply:
 | | Re: MPD file loading search order
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| (...) I actually consider that to be two-pass, and that's essentially what LDView does. The only extra thing it does is that it checks for 0 PART meta-commands in the first pass, and puts the file data for the sub-files into their own separate (...) (18 years ago, 26-Jul-06, to lugnet.cad.dev)
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Message is in Reply To:
| | Re: MPD file loading search order
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| (...) I mentioned in my other (long) post that I don't think that MPD files should be required to have a .mpd extension. However, I'd like to add more here in answer to your specific question. I could be wrong, but I'm almost positive that it is (...) (18 years ago, 25-Jul-06, to lugnet.cad.dev)
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