Re: Lilypond structure / implicit - explicit / with statement

[Bernard]

On 03-04-16 22:56, David Kastrup wrote:
> Bernard <address@hidden> writes:
>
> > Hi Paul,
> >
> > That does help. I found out \with is a very special statement.
> Not really.  \with can be part of other constructs, just like "else" can
> be part of other constructs in many programming languages (including
> Scheme).  It is not a "statement" at all.
That does help a lot. Now I understand why there can not be anything 
before /with.
> > It influence what happens before the statement, it must be executed
> > just after \new . That is the reason why my examples 4 and 5 did not
> > work.
> > And it influence what happens after the statement. If within the Staff
> > not a additional Staff property can be set.
> >
> > No wonder it confuses me.
> \with introduces "context modifications".  They are basic expressions in
> that they can be stored in variables and passed to functions, but to
> take effect, they need to be applied to an actually created context, and
> there are various syntactic constructs for doing that.
>
> They "influence what happens after the statement" like any modification
> to anything.  Their influence is restricted to contexts they are applied
> to (possibly via layout or context definitions or wrapped into other
> context modifications).

I still do not get it all. By the way, I am my self a Python programmer 
and object orientation in known to me.

The example of Thomas Morly with his house with rooms is all in line 
with object orientation and setting values of properties.

But still I am missing something.

I have attached some more real live code using /with and and example I 
tried to skip the /with section and assign properties directly, which fails.

Thanks very much for all your good work.

With regards,

Bernard

with_context.ly
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