On Mon, Feb 22, 2010 at 9:13 AM, Yoder Stuart-B08248
<b08...@freescale.com> wrote:
>
>> > That still leaves node and property deletion to cover. In keeping
>> > with the above approach, I'd like to do that in the form of
>> "negative
>> > redefinitions" of properties or nodes. A neat syntax for
>> that doesn't
>> > immediately occur to be for that yet, though.
>>
>> hmmm. I'll think more about it too. I agree that a negative
>> redefinition sounds like a reasonable approach. I do want the ability
>> to drop nodes easily. It would make it easy to handle SoC or FPGA
>> design variants.
>
> We had a similar problem in the Freescale Embedded Hypervisor
> to control the generation of guest device trees. We defined
> several 'magic' properties that had special meaning in
> the context of a node update.
heh, so the functionality is definitely needed, but boy is that ugly!
:-) I really do think there needs to be a syntactically distinct
method of deleting nodes and properties. Magic property names that
look like normal properties worry me.
What about something like this: Right now nodes are defined by <name>
{ [<property>|<node>]; ... }; and properties are defined by <name>; or
<name> = <value>; To differentiate a command from either a node or
property definition, perhaps round braces could be used:
so for the definition:
a-node {
property-1;
property-2 = "blah";
child-1 {
...
};
};
you could delete property-2 and node-1 with:
a-node {
delete-node(child-1);
delete-property(property-2);
};
> We also had the need to prepend to a <stringlist> so that
> compatible properties could be updated.
>
> prepend-stringlist <stringlist> The value is a string list that
> specifies on or more property name/value
> pairs.
This is a bit of a harder problem. I've go no ideas on how to handle
this in a syntactically elegant way.
g.
--
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.
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