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From: "Nicklas Karlsson (nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
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Subject: Re: [geda-user] A fileformat library (C, dimensions, directions)
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> > Writing a parser for geda-gaf files is simpler than penetrating an API
> > wrapping such a parser. That doesn’t mean you can do either in an instant.
> >
> 
> Highly unlikely for .sch, no chance whatsoever for pcb.  We're talking
> about one function call in each direction form YAML/JSON. ...

One function call in each direction: refdes, net, layer, footprint, ... There is a need to access objects in different directions or dimensions, there may also be a need for a notification to gui or possible dbus then data have changed.

C or C++ is probably the first choice since it is very common although I like Ada more.

Nicklas Karlsson