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## Re: Auto-beaming infrastructure redo

 From: Hans Aberg Subject: Re: Auto-beaming infrastructure redo Date: Sat, 3 Jul 2010 15:21:21 +0200

```On 3 Jul 2010, at 12:37, Carl Sorensen wrote:

```
```If I throw in tuplets in this AST, setting them to 1:1, I get:
+
|
(1:1, [(2, 1/8), (3, 1/8), +, (3, 1/8)])
|
(1:1, [(2, 1/8), ((3, 1/8), (2, 1/8)])

```
That is, the tuplet p:q just appears as a pair (p, q) attached to the
```list.
```
```
```
But we don't need to introduce the tuplets in the LilyPond structure,
```because the p:q for tuplets is already handled by LilyPond, as far
as I can
tell.  At least for right now, I think we can use a single
fundamental unit.
```
```
I think you may need to have the tuplets as a part of this structure
in order to compute the correct beaming. Then the current flexible
approach of LilyPond where they can be broken up in pieces might be a
complication.
```
```
```
Can you give me a specific example of beaming where the tuplets would be
```necessary?
```
```
```
If one has say a triplet, then I think LilyPond admits breaking it up into to separate parts with some non-triplet notes between - LilyPond just checks that the timing is correct.
```
```
When one wants to beam correctly, a complete triplet group, as above, is also a specification that the first not should have the stem top the right only and the last one to the left only.
```
```
So I suspect that for proper beaming, one has to first make complete tuplet groups. LilyPond might need some new syntax to ensure that this information is provided or structure enforced.
```
Hans

```