Subject:
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Re: Prefix character on meta commands?
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Newsgroups:
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lugnet.cad.dev.org.ldraw
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Date:
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Wed, 28 Mar 2007 12:51:46 GMT
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Viewed:
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2564 times
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In lugnet.cad, Willy Tschager wrote:
> guys,
>
> flicking through the specs I got a bit confused and seek clarification
> (preferably from the LSC)
>
> we have the list of Official META Commands:
> http://www.ldraw.org/Article401.html
>
> the list of currently known META Commands:
> http://www.ldraw.org/Article342.html
>
> the LDraw File Format 1.0.0 proposal (oddly there is no link to Article401):
> http://www.ldraw.org/Article218.html
>
> and this post in the LSC archive introducing the ! as prefix
> http://five.pairlist.net/pipermail/lsc/2003-December/000063.html
>
> summarizing the info we get:
>
> *************Article218*************
>
> META Commands
>
> A META command is a statement used to tell an LDraw compatible program to do
> something. There are currently many official META commands and almost as many
> unofficial META commands. In a META command, a keyword follows the line type in
> the line. The keyword must be in all caps. The generic META line format is:
>
> 0 !<META command> <additional parameters>
>
> Where:
>
> * <META command> is any string in all caps
> * <additional parameters> is any string. Note that if a META command does
> not require any additional parameter, none should be given.
>
> *************Article218*************
>
> Adding New META Commands
>
> Here are some guidelines LDraw.org compatible program developers should consider
> when add new META command functionality to their programs:
>
> * All the new META commands should be based on a program name where this
> META command is defined/used first. For example: if your program is called
> LDParser and you want to add a META command called EXAMPLE then your command
> should appear in DAT code as 0 LDPARSER EXAMPLE.
> * Avoid defining META commands which are similar in name but not equal in
> function to already existing META command. Doing this will avoid user confusion
> and possible erroneous output.
>
> *************Article401*************
>
> The following is a list of META commands that have been formally adopted into
> the LDraw.org File Format and links to the applicable specifications. Note that
> all new official META commands will have a "!" as the prefix character
>
> ************************************
>
>
> my question is:
>
> have/shall old/new meta commands get the "!" as the prefix character when a
> program gets updated?
>
> has for example LPUB PAGE SIZE to be changed to !LPUB PAGE SIZE or ROTATION
> CENTER <x> <y> <z> "<name>" to !MLCAD ROTATION CENTER <x> <y> <z> "<name>" when
> a new version is released. what is the difference between official and
> unofficial? will an unofficial meta become official when it follows the
> guidelines?
>
> w.
I am no longer on the LSC, but I'll give my opinion.
Given that the LPUB, SYNTH and MLCad's ROTATION meta's were defined before
there was ever an LSC, before the LDraw file format 1.0.0.0 was officially
ratified, or before the discussion in article 401 (four years ago), I don't
think that they can be consdered new.
Just because I release a new version of LPub, or LSynth (which is what really
motivated your post), does not somehow magically mean the meta's are new.
It is my belief that the meta-commands specified in the LDraw file format
1.0.0.0 are the only official meta commands.
I consider changing the LPUB meta command to !LPUB, or SYNTH to !SYNTH busy
work, and that such changes provide no value to the programs' functionality.
Furthermore I think it would confuse the average user, and only provide
satisfaction to a tiny percentage of the total LDraw users.
Given that four years have passed since the article 401 was written, and that
most (if not all) the major LDraw programs have not changed over to the !
format, I'd say that article 401 was not very well embraced by the community nor
encourages, or enforced by the LSC.
Kevin
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Message has 2 Replies:
 | | Re: Prefix character on meta commands?
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| (...) As the author of the meta command section of the 1.0.0.0 spec, my intention wasn't to twist the arms of developers into adopting the "!" prefix or the program name requirement. For non-official LDraw.org programs, I meant for these rules to be (...) (18 years ago, 28-Mar-07, to lugnet.cad.dev.org.ldraw)
| | | Re: Prefix character on meta commands?
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| (...) While I am a current member of the LSC, this hasn't been discussed there. It has always been my understanding that this format for meta commands was never intended to require existing meta commands (official or otherwise) to be changed. (...) (18 years ago, 28-Mar-07, to lugnet.cad.dev.org.ldraw)
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Message is in Reply To:
| | Prefix character on meta commands?
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| guys, flicking through the specs I got a bit confused and seek clarification (preferably from the LSC) we have the list of Official META Commands: (URL) list of currently known META Commands: (URL) LDraw File Format 1.0.0 proposal (oddly there is no (...) (18 years ago, 27-Mar-07, to lugnet.cad, lugnet.cad.dev.org.ldraw)
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