Re: [GLISS] turn xxx.yyy into ("xxx" "yyy")

[Han-Wen Nienhuys]

On Wed, Sep 12, 2012 at 12:04 PM, David Kastrup <address@hidden> wrote:
> Han-Wen Nienhuys <address@hidden> writes:
>
>> On Wed, Sep 12, 2012 at 5:38 AM, David Kastrup <address@hidden> wrote:
>>>
>>> Hi,
>>>
>>> if we write xxx in LilyPond, this is considered to be a string.  I want
>>> xxx.yyy.zzz to be a list of strings ("xxx" "yyy" "zzz").  The main
>>> incentive is to be able to have music functions be able to accept both
>>> Stem as well as Staff.TimeSignature as a function argument.
>>
>>> What do you think?
>>
>> doesn't this a different polymorphic annoyances somewhere else, ie.
>>
>>   \set "keySignature" = #(..)
>>   \set "Staff.keySignature" = #(..)
>     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>
> I don't think the second line was ever permitted.

Right, but

\set Staff.keySignature = #(..)

is, and it will be affected by this change?

>> now, \set gets either a string (keySignature) or list of string. Are
>> music function equipped to deal with this type of polymorphism.
>
> A music function that is only able to deal with a string argument should
> declare its argument type as string? and then it will only ever get a
> string argument.
>
> Music functions will not, in general, be prepared to deal with this sort
> of polymorphism, their argument predicates will have stated this, and
> consequently they will not get to see it.
>
> --
> David Kastrup

-- 
Han-Wen Nienhuys - address@hidden - http://www.xs4all.nl/~hanwen