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Date: Wed, 6 Jan 2016 14:11:06 -0900
Message-ID: <CAC4O8c_NRWWWnNLkgDDYCGonM=gw3=NBB72dhC0D8whdu3w8Ng@mail.gmail.com>
Subject: Re: [geda-user] A fileformat library
From: "Britton Kerin (britton DOT kerin AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
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On Tue, Jan 5, 2016 at 11:53 PM, Nicklas Karlsson (
nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com] <
geda-user AT delorie DOT com> wrote:

> > I recently did a tiny bit of work on the parser in pcb.  Of course we
> > should continue to support it, but it's going to be tough to extend it
> > much.  It's already overloaded in weird ways (e.g. thermals are parsed as
> > flags, with their own non-flex sub-syntax, even though they don't set any
> > actual flags).  If you do extend it you do hard work and still only pcb
> can
> > read it.  Of course you still have to teach the innards of pcb about your
> > extensions in order for them to do anything useful.
>
> A good start might be to write down what need to be stored even though
> they are not implemented right now and maybe never will be:
>   1. Padstack, probably as collection of ordinary drawing primitives.
>   2. Local copy and reference so update is possible.
>   3. Net and possible segment attribute for route style, width.
>   4. Net clerances between any net.
>   5. Net clerance classes although (4.) could be extended before entering
> pcb.
>   6. Trace impedance.
>   7. Differential impedance?
>   8. Pin swapping!
>   9. Slot swapping.
>

Lev did something very like this last time this got discussed as sql
schema.  I don't think it had all the above but some of it.

Britton

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<div dir=3D"ltr"><br><div class=3D"gmail_extra"><br><div class=3D"gmail_quo=
te">On Tue, Jan 5, 2016 at 11:53 PM, Nicklas Karlsson (<a href=3D"mailto:ni=
cklas DOT karlsson17 AT gmail DOT com">nicklas DOT karlsson17 AT gmail DOT com</a>) [via <a href=
=3D"mailto:geda-user AT delorie DOT com">geda-user AT delorie DOT com</a>] <span dir=3D"l=
tr">&lt;<a href=3D"mailto:geda-user AT delorie DOT com" target=3D"_blank">geda-use=
r AT delorie DOT com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" st=
yle=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span=
 class=3D"">&gt; I recently did a tiny bit of work on the parser in pcb.=C2=
=A0 Of course we<br>
&gt; should continue to support it, but it&#39;s going to be tough to exten=
d it<br>
&gt; much.=C2=A0 It&#39;s already overloaded in weird ways (e.g. thermals a=
re parsed as<br>
&gt; flags, with their own non-flex sub-syntax, even though they don&#39;t =
set any<br>
&gt; actual flags).=C2=A0 If you do extend it you do hard work and still on=
ly pcb can<br>
&gt; read it.=C2=A0 Of course you still have to teach the innards of pcb ab=
out your<br>
&gt; extensions in order for them to do anything useful.<br>
<br>
</span>A good start might be to write down what need to be stored even thou=
gh they are not implemented right now and maybe never will be:<br>
=C2=A0 1. Padstack, probably as collection of ordinary drawing primitives.<=
br>
=C2=A0 2. Local copy and reference so update is possible.<br>
=C2=A0 3. Net and possible segment attribute for route style, width.<br>
=C2=A0 4. Net clerances between any net.<br>
=C2=A0 5. Net clerance classes although (4.) could be extended before enter=
ing pcb.<br>
=C2=A0 6. Trace impedance.<br>
=C2=A0 7. Differential impedance?<br>
=C2=A0 8. Pin swapping!<br>
=C2=A0 9. Slot swapping.<br></blockquote><div><br></div><div style=3D"">Lev=
 did something very like this last time this got discussed as sql schema.=
=C2=A0 I don&#39;t think it had all the above but some of it.</div><div>=C2=
=A0</div><div style=3D"">Britton</div><div><br></div></div></div></div>

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