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Subject: Re: [geda-user] why I parse sch: gnetlist, writing backends (Back annotation)
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On Sat, Jul 11, 2015 at 7:34 AM, Roland Lutz <rlutz AT hedmen DOT org> wrote:

> On Fri, 10 Jul 2015, gedau AT igor2 DOT repo DOT hu wrote:
>
>> So next time I have something similar to solve, I will first ask you for
>> the scheme code and only if that fails I do the dirty sch-parsing awk
>> fewliner.
>>
>
> You could use Xorn.  Since this uses the actual gEDA parsing code, the
> result is exactly what gEDA would see when reading the file.  Taking the
> "outputting coords of line segments" task as an example, this would be:
>
>     import xorn.storage
>     from xorn.geda.read import read
>
>     sch = read('some-schematic.sch')
>
>     for ob in sch.toplevel_objects():
>         data = ob.data()
>         if isinstance(data, xorn.storage.Line):
>             print 'X1: %d Y1: %d X2: %d Y2: %d' % (
>                 data.x, data.y, data.x + data.width, data.y + data.height)
>

I don't know why everyone is complaining about Scheme.  I can read this
just fine, the first time I ever saw it.

M.

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<div class=3D"gmail_quote">On Sat, Jul 11, 2015 at 7:34 AM, Roland Lutz <sp=
an dir=3D"ltr">&lt;<a href=3D"mailto:rlutz AT hedmen DOT org" target=3D"_blank">rl=
utz AT hedmen DOT org</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" s=
tyle=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><spa=
n class=3D"">On Fri, 10 Jul 2015, <a href=3D"mailto:gedau AT igor2 DOT repo DOT hu" ta=
rget=3D"_blank">gedau AT igor2 DOT repo DOT hu</a> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
So next time I have something similar to solve, I will first ask you for th=
e scheme code and only if that fails I do the dirty sch-parsing awk fewline=
r.<br>
</blockquote>
<br></span>
You could use Xorn.=C2=A0 Since this uses the actual gEDA parsing code, the=
 result is exactly what gEDA would see when reading the file.=C2=A0 Taking =
the &quot;outputting coords of line segments&quot; task as an example, this=
 would be:<br>
<br>
=C2=A0 =C2=A0 import xorn.storage<br>
=C2=A0 =C2=A0 from xorn.geda.read import read<br>
<br>
=C2=A0 =C2=A0 sch =3D read(&#39;some-schematic.sch&#39;)<br>
<br>
=C2=A0 =C2=A0 for ob in sch.toplevel_objects():<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 data =3D ob.data()<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 if isinstance(data, xorn.storage.Line):<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 print &#39;X1: %d Y1: %d X2: %d Y=
2: %d&#39; % (<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 data.x, data.y, dat=
a.x + data.width, data.y + data.height)<br></blockquote><div><br>I don&#39;=
t know why everyone is complaining about Scheme.=C2=A0 I can read this just=
 fine, the first time I ever saw it.<br><br>M.<br></div></div>

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