Re: gEDA-user: blue sky ideas - written down finally

[DJ Delorie <dj@xxxxxxxxxxx>]

Right, [] is "grouping" and how you map groups to each other
determines the functionality.  The syntax is based on "what should be
obvious"...

[a b c] = [x y z] maps all of a group of signals to a group of pins, 1:1

a = [x y z] maps one signal to a group of pins, one-to-many

[a b c] = x doesn't make sense (or at least isn't obvious), so is not allowed.


[a b] = [x y z] is not allowed, because it's not obvious what you mean, but...
[a b] = [[x y] z] is allowed.  a-> both x and y, and b->z, as is...
[a b] = [(x y) z] is allowed.  a-> either x or y, and b->z.

a = (x y z) maps a signal to one of a group of pins, one-to-one

[a b y] = ([1 2 3] [4 5 6] [7 8 9]) maps all of a group of signals to
	all of one group of pins, chosen from a list of groups.

a = ([1 2 3] [4 5 6] [7 8 9]) maps one signals to all of one group of
	pins, chosen from a list of groups.

So () means "use one of" and [] means "use all of"


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