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Date:	Sun, 10 Jan 2016 21:58:51 +0000
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Subject:	Re: [geda-user] A new PCB file format - modular system
From:	"Peter Clifton (petercjclifton AT googlemail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
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Hi Milan,

That is a surprisingly small patch!

Did you have some of your example format readers / writers to share too?


Peter

On 10 January 2016 at 21:23, Milan Prochac (milan AT prochac DOT sk) [via
geda-user AT delorie DOT com] <geda-user AT delorie DOT com> wrote:

> After reading long discussions about the new PCB file format I tried to
> implement support for multiple file  formats.
>
> You can download it here:
> http://static.bastl.sk/pcb/Modular-file-formats.gz It is also available
> on launchpad: https://bugs.launchpad.net/pcb/+bug/1532611
>
> The patch implements modular system to support multiple PCB file formats.
> Attached is also the template of the file-format plugin with instructions.
>
> The patch is not too big, but it touches various parts of PCB, so it is
> possible that some corner cases are not handled properly. Comments and bug
> reports are welcome.
>
> The modular system utilizes existing plugin system; new type of plugin is
> added to support various file formats. This approach allows implementation
> of additional file formats as independent shared library with minimal
> effort. The whole implementation of new file format is reduced to
> serialization and de-serialization of PCBType data structure, no PCB
> tweaking is necessary. The template with instructions is provided, as
> mentioned above.
>
> - modular system is available for all layout operations (Load, Save, Save
> As, Load to buffer, Revert, auto-backup); the element operations will be
> added later.
> - action "SaveTo(LayoutAs..." was extended by 3rd argument, specifying
> file format; if omitted, current (or default) format is used
> - GUI (GTK only at the moment) was adjusted to allow select file format;
> for "save" operations it specifies desired format, for "open" operations it
> is used as filter
> - file format is detected automatically by modular framework
> - the versioning system (based on PCB file version #defines) is available
> - each plugin should confirm it's capability to save data of required
> version (like 20110603); if not, the file format cannot be used
> - load-only and save-only formats are supported. If save-only format is
> used, the layout is not marked as "saved".
> - the current PCB format is converted to built-in plugin.
>
> With this enhancement it should be very easy to implement new file
> formats. If more of them will be available, the most successful can become
> new standard PCB format and - hopefully -  the data model modifications
> will be not blocked by hard-to-extend file format anymore...
>
> Regards
> Milan
>

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<div dir=3D"ltr"><div><div><div>Hi Milan,<br><br></div>That is a surprising=
ly small patch!<br><br></div>Did you have some of your example format reade=
rs / writers to share too?<br><br><br></div>Peter<br></div><div class=3D"gm=
ail_extra"><br><div class=3D"gmail_quote">On 10 January 2016 at 21:23, Mila=
n Prochac (<a href=3D"mailto:milan AT prochac DOT sk">milan AT prochac DOT sk</a>) [via <=
a href=3D"mailto:geda-user AT delorie DOT com">geda-user AT delorie DOT com</a>] <span di=
r=3D"ltr">&lt;<a href=3D"mailto:geda-user AT delorie DOT com" target=3D"_blank">ge=
da-user AT delorie DOT com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quo=
te" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"=
>After reading long discussions about the new PCB file format I tried to im=
plement support for multiple file=C2=A0 formats.<br>
<br>
You can download it here: <a href=3D"http://static.bastl.sk/pcb/Modular-fil=
e-formats.gz" rel=3D"noreferrer" target=3D"_blank">http://static.bastl.sk/p=
cb/Modular-file-formats.gz</a> It is also available on launchpad: <a href=
=3D"https://bugs.launchpad.net/pcb/+bug/1532611" rel=3D"noreferrer" target=
=3D"_blank">https://bugs.launchpad.net/pcb/+bug/1532611</a><br>
<br>
The patch implements modular system to support multiple PCB file formats. A=
ttached is also the template of the file-format plugin with instructions.<b=
r>
<br>
The patch is not too big, but it touches various parts of PCB, so it is pos=
sible that some corner cases are not handled properly. Comments and bug rep=
orts are welcome.<br>
<br>
The modular system utilizes existing plugin system; new type of plugin is a=
dded to support various file formats. This approach allows implementation o=
f additional file formats as independent shared library with minimal effort=
. The whole implementation of new file format is reduced to serialization a=
nd de-serialization of PCBType data structure, no PCB tweaking is necessary=
. The template with instructions is provided, as mentioned above.<br>
<br>
- modular system is available for all layout operations (Load, Save, Save A=
s, Load to buffer, Revert, auto-backup); the element operations will be add=
ed later.<br>
- action &quot;SaveTo(LayoutAs...&quot; was extended by 3rd argument, speci=
fying file format; if omitted, current (or default) format is used<br>
- GUI (GTK only at the moment) was adjusted to allow select file format; fo=
r &quot;save&quot; operations it specifies desired format, for &quot;open&q=
uot; operations it is used as filter<br>
- file format is detected automatically by modular framework<br>
- the versioning system (based on PCB file version #defines) is available -=
 each plugin should confirm it&#39;s capability to save data of required ve=
rsion (like 20110603); if not, the file format cannot be used<br>
- load-only and save-only formats are supported. If save-only format is use=
d, the layout is not marked as &quot;saved&quot;.<br>
- the current PCB format is converted to built-in plugin.<br>
<br>
With this enhancement it should be very easy to implement new file formats.=
 If more of them will be available, the most successful can become new stan=
dard PCB format and - hopefully -=C2=A0 the data model modifications will b=
e not blocked by hard-to-extend file format anymore...<br>
<br>
Regards<span class=3D"HOEnZb"><font color=3D"#888888"><br>
Milan<br>
</font></span></blockquote></div><br></div>

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