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[Lilypond-auto] [LilyIssues-auto] [testlilyissues:issues] #4779 Accept i


From: Auto mailings of changes to Lily Issues
Subject: [Lilypond-auto] [LilyIssues-auto] [testlilyissues:issues] #4779 Accept isolated durations as music function arguments
Date: Fri, 26 Feb 2016 12:02:34 +0000

Issue 4779: Accept isolated durations as music function arguments

Also contains commits:

Use new arguments of make_duration

Let make_duration accept preexisting durations and factor

Let make_music_from_simple accept numbers/durations

parser.yy: factor out "multipliers" from "multiplied_duration"

parser.yy: Remove redundant duration_length

http://codereview.appspot.com/288380043


[issues:#4779] Accept isolated durations as music function arguments

Status: Started
Created: Sun Feb 21, 2016 08:59 PM UTC by pkx166h
Last Updated: Fri Feb 26, 2016 12:02 PM UTC
Owner: David Kastrup

On 19/02/16 03:11, Peter Crighton wrote:

% As discussed on the User mailing list, isolated durations are currently not
% accepted as expressions of type ly:music?, thus making it impossible to
% create functions expecting either music or isolated durations with an
% arbitrary number of post events.
% http://lists.gnu.org/archive/html/lilypond-user/2016-02/msg00478.html

Example code not quoted: it demonstrated a limitedly useful circumvention rather than the problem. One straightforward fix would be to provide for supporting an event-list? predicate that would then deliver an arbitrary-length (including zero) list of post-events. Another somewhat more cumbersome way would be to allow the PostEvents container music type (used in some restricted manners inside of the parser) to package multiple events also for post-event function arguments. However, that would likely complicate matters for the user since it might make that music event pop up in a number of places where it's never seen before.

For better or worse, this issue here is only about allowing bare rhythmic durations, previously allowed only inside of music sequences, as proper function arguments.


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