On 11 March 2018 at 10:58, David Kastrup <d...@gnu.org> wrote:
> Gianmaria Lari <gianmarial...@gmail.com> writes:
>
> > Just to understand how does it work the relation between scheme and
> > lilypond. Why this does not work?
> >
> > \version "2.19.81"
> > { c#(+6 2) }
> >
> > I would expect this compile to
> >
> > \version "2.19.81"
> > { c8 }
>
> So much wrong with this...
First, (+6 2) calls 6 as function on 2.
> That doesn't work. You need (+ 6 2) here.
>
yes, this was just a typo.
> Then Scheme expressions written using # in the middle of music are
> expected to be music expressions.
If you want to insert an actual
> duration, you need to write it preceded with $ so that it can have
> different type (and trigger different syntactic rules).
>
> But $8 is not a duration. $(ly:make-duration 3 0) would be a duration.
How does it work ?
Originary I thought that before source compilation, there was a step where
to replace scheme expressions with their evaluation, like a preprocessor;
that's why I tried c#(+ 6 2). But ok, it's clear it doesn't work in this
way.
Is this handled by the lilypond parser that create a parse tree and then
according position in the tree and # or $ it expects different types?
Thank you, g.
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