A proposal of organize music paragraph layout by a new DSL

[K.L.]

Hi all.

For a multiple voices music score, all voices share the same repeat
positions. Such as:

<<
>   {
>     \repeat volta 2 { g1 g g g }
>     \repeat volta 2 { g g g g }
>   }
>   {
>     \repeat volta 2 { c1 c c c }
>     \repeat volta 2  { c c c c }
>   }
> >>


The repeat layout information occurred 2 times, that is waste and
error-leading.

Considering change it like this:

\repeat layout "2*[1..4], 2*[5..8]" <<
>         {
>               g1 g g g g g g g
>         }
>         {
>               c1 c c c c c c c
>         }
> >>


We can define a new DSL to express all kinds of repeat types, including
volta, volta-alternative and *D.C. al Fine* and so on. For some examples:

[image: image.png]
code: *1, 2, 3, 4*
or:     *1..4*

[image: image.png]
code: *2*[1, 2], 3*

[image: image.png]

code: *2*[1, 2]{3, 4}*

[image: image.png]
code: *<[1, 2], 3, 4>*

Via this, exact MIDI performing for D.C. & D.S. can also be done.

I have implemented a basic grammar parser in my project to facilitate score
edition. See the demo video <https://www.youtube.com/watch?v=uUOV-Kjrt4M>.
And my blog <http://I have implemented a basic grammar parser in my project
to facilitate score edition. See the demo video. My blog to illustrate
this.> to descript details.

>
Beside measure indices, we can consider adding some grammar to express
partial measure, like '1 + 1/4'. But the upbeat beginning music's measure
index rule seems a little ambiguous. We should clarify how the measure
index works in any situation first.

Glad to hear any ideas.