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Date:	Tue, 12 Aug 2014 15:20:17 -0700
From:	Cirilo Bernardo <cirilo_bernardo AT yahoo DOT com>
Subject:	Re: [geda-user] rs-274x nits
To:	"geda-user AT delorie DOT com" <geda-user AT delorie DOT com>
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----- Original Message -----
> From: Dave Curtis <davecurtis AT sonic DOT net>
> To: geda-user AT delorie DOT com
> Cc: 
> Sent: Wednesday, August 13, 2014 7:26 AM
> Subject: Re: [geda-user] rs-274x nits
> 
> On 08/12/2014 01:49 PM, Cirilo Bernardo wrote:
>>  ----- Original Message -----
>> 
>>>  From: Dave Curtis <davecurtis AT sonic DOT net>
>>>  To: geda-user AT delorie DOT com
>>>  Cc:
>>>  Sent: Wednesday, August 13, 2014 3:51 AM
>>>  Subject: [geda-user] rs-274x nits
>>> 
>>>  I'm trying to interpret the gerber format specification document
>>>  authored by Ucamco.
>>> 
>>>  1. On page 35 it says:
>>>  The line separators CR and LF have no effect; they can be ignored when
>>>  processing the file. It
>>>  is recommended to use line separators to improve human readability.
>>> 
>>>  2. On page 36 it says:
>>>  It is recommended to add line separators between data blocks for
>>>  readability. Do not
>>>  put a line separator within a data block, except after a comma 
> separator
>>>  in long data blocks.
>>>  The line separators have no effect on the image.
>>> 
>>> 
>>>  3. on page 40, talking about closing parameter blocks it says:
>>>  The ‘%’ must immediately follow the ‘*’ of the last data block without
>>>  intervening line separators.
>>>  This is an exception to the general rule that a data block can be
>>>  followed by a line separator.
>>> 
>>>  #3 is clear enough.
>>> 
>>>  #1 and #2 seem to be in conflict.  A strict reading of #1 would say 
> that
>>>  CR and LF should simply be expunged, and that CR/LF could even split
>>>  G-coded, numbers, etc., like this:
>>>  G
>>>  03
>>>  X
>>>  123
>>>  *
>>>  Which seems odd, but is a result of strict reading of #1.   But is in
>>>  conflict with the advice of #2.
>>> 
>>>  It's easy enough to comply with the advice of #2 while writing.  
> But if
>>>  reading RS-274X, should CR/LF's that split lexical units be 
> ignored?
>>>  Although I realize that even if legal, I doubt if anyone writes gerber
>>>  that way.
>>> 
>>>  -dave
>>> 
>> 
>>  There is no conflict at all:
>> 
>>  1. The CR/LF are optional; you do not need them but they are recommended
>>  to make the file look better to humans.
>> 
>>  2. If you use CR/LF to make a data block look prettier, you can only use
>>  CR/LF after a comma.
> 
> NO!  That directly conflicts with #1 "CR and LF no effect."  Which is 
> it?
> 


Well, as 2 of us have already said, it's both. If you look at #2 the
specification does state that data blocks are an exception and that
CR/LF are only allowed after a ',' within a data block. The specification
is very clear that this is an exception, so why do you insist that it
violates the other general rule?

- Cirilo

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