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Date:	Sun, 8 Feb 2015 15:15:00 -0900
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Subject:	Re: [geda-user] Using Lua to safely read configuration and layout
	files (program attached)
From:	Britton Kerin <britton DOT kerin AT gmail DOT com>
To:	geda-user AT delorie DOT com
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On Sun, Feb 8, 2015 at 8:09 AM, John Doty <jpd AT noqsi DOT com> wrote:
>
> On Feb 8, 2015, at 9:41 AM, Chris Smith <space DOT dandy AT icloud DOT com> wrote:
>
>>
>>> 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.
>
> In Lua’s representation. Not as a Scheme data structure. You have exactly the same problem the C implementation has: you must expose the data through a Scheme API. You’re not really solving any problems, just torquing the design to fit your Lua prejudice.

+1+1+1.  In advocating the use of a less-known language that you personally
happen to know, you're essentially saying that your prospective contributions
are larger than the prospective contributions of a much larger community.
You might be right but the odds are against it.  The languages themselves
aren't different enough for the differences to matter.

Britton

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