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Subject: Re: [geda-user] A fileformat library
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From: John Doty <jpd AT noqsi DOT com>
In-Reply-To: <20160103173859.ce123a8957899e5c3e496d9b@gmail.com>
Date: Sun, 3 Jan 2016 12:25:20 -0700
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On Jan 3, 2016, at 9:38 AM, Nicklas Karlsson =
(nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com] =
<geda-user AT delorie DOT com> wrote:

>> As I've mentioned previously I'm talking pcb, which is a more painful
>> format to parse (such that so far as I'm aware the parser in pcb is =
the
>> only one).  Personally I find formats like this:
>>=20
>>  device=3DRESISTOR
>>  T 44400 49300 5 10 1 1 90 0 1
>>=20
>> substantially less readable than ones with field names, but they are =
indeed
>> easy to parse.  The pcb format is quite a bit more elaborate and the
>> savings from not rolling your own parser are more significant.
>=20
> Yes this is simple to parse, use little file space but do not have =
field name. To use little file space and be simple to parse is actually =
two good properties of a file format.
>=20
> Lack of field names may be worked around by having a list of field =
names in the beginning.

Except that we haven=92t changed the format in 12 years. Any changes we =
might want may be handled with attributes. So, the list of field names =
is constant and may be defined in a separate file for full backward =
compatibility.

> If this list of field names is sorted according to how often they are =
used and each row only have to list used values it would probably be a =
file format with rather good properties.
>=20
> To enumerate the field names at the beginning of the file may also be =
a solution. Or maybe to use representation of data structures from a =
programming language.
>=20
>=20
>=20
> Nicklas Karlsson
>=20

John Doty              Noqsi Aerospace, Ltd.
http://www.noqsi.com/
jpd AT noqsi DOT com



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