kicad-developers team mailing list archive

[Dick Hollenbeck <dick@...>]

Werner Almesberger wrote:
> Lorenzo wrote:
>
> > Actually zsh because I was lazy and zsh has floating point
>
> Aah, zsh ! How could I forget ... I guess Dick's choice would be
> Java. Awk, anyone ? :)
On footprints:

(footprint footprint_def
(units mil)
(resolution 10)
(const variable_def 30.4)
(padstack pad_def ......)
(pad pin1 pad_def 0 0 (expr 0 + variable_def * 0))
(pad pin2 pad_def 0 0 (expr 0 + variable_def * 1))
(pad pin3 pad_def 0 0 (expr 0 + variable_def * 2))
(pad pin4 pad_def 180 250 (expr 0 + variable_def * 0))
(pad pin5 pad_def 180 250 (expr 0 + variable_def * 1))
(pad pin6 pad_def 180 250 (expr 0 + variable_def * 2))
(pad pin7 pad_def 180 250 (expr 0 + variable_def * 3))
(outline....)

# we should probably support comments, and teach the
# lexer to pass them up to the parser so they can be preserved.
)

We really don't need much in terms of expression support. Simple mx+b 
support is about all for positioning a pad with given shape. In the 
above example, the keyword choices are negotiable. The tokens like 
*_def are identifiers and would get more meaningful names than the ones 
presented. 

Using a smart copy and paste routine accessible from within the 
footprint editor, using the STRINGFORMATTER that I presented already, a 
person could copy the footprint to the clipboard, from there paste it 
into a text editor, edit it, and then "smart paste" it back into the 
footprint editor. This is an alternative interactive trial and error 
opportunity for designing a footprint. The smart paste routine would 
have to report line number and offset of any syntax or grammar errors.


If you want another pad, simply copy a line of text in your text editor 
and add another pad row or two.


In the above example the (expr) element replaces the relative Y 
coordinate with an expression of mx+b. The same could be supported with 
X coordinate. In the second half of the pad instantiations, they are 
rotated 180 degrees. Re-use the specctra elements where they make 
sense, add our own when none exists that we need such as (expr).


KISS. 

(When she's attractive only. Walk away if she's ugly.)


Dick