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From: Chris Smith <space DOT dandy AT icloud DOT com>
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Subject: Re: [geda-user] Using Lua to safely read configuration and layout
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Date: Sun, 08 Feb 2015 16:41:04 +0000
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> On 8 Feb 2015, at 15:53, John Doty <jpd AT noqsi DOT com> wrote:
>> On Feb 8, 2015, at 6:39 AM, Christian Riggenbach <criggenbach AT magahugu DOT ch> wrote:
> 
>> Simple
>> tasks like outputing the filenames of all the referenced symbols should be
>> possible with the netlister,
> 
> Yes. However, that information is hidden by the API. The Scheme configuration code tells the C layer where to look. The C layer finds the files. The C layer does not reveal the file names, or where it found them, through the API to the Scheme layer. This is a problem. Similarly, you can attach attributes to net segments, but the netlister can’t get at them. Having the schematic representation in C structures and only publishing certain views of this data through the Scheme API is a serious limitation. The views are well chosen for flat netlisting and BOM generation, but sometimes you need more.

Yes! And that's the main point to using Lua for the data format. The data file _is_ the internal representation. The netlister has immediate and trivial access to the entire data set, with no abstraction, hiding or anything else.

Chris