-;;;
-;;; auto-beam.scm -- Auto-beam-engraver settings
-;;;
-;;; source file of the GNU LilyPond music typesetter
-;;;
-;;; (c) 2000 Jan Nieuwenhuizen <janneke@gnu.org>
-;;;
+;;;; auto-beam.scm -- Auto-beam-engraver settings
+;;;;
+;;;; source file of the GNU LilyPond music typesetter
+;;;;
+;;;; (c) 2000--2008 Jan Nieuwenhuizen <janneke@gnu.org>
;;; specify generic beam begin and end times
;;; where
;;;
;;; function = begin or end
-;;; shortest-duration-in-beam = numerator denominator; eg: 1 16
-;;; time-signature = numerator denominator, eg: 4 4
+;;; shortest-duration-in-beam = numerator denominator; e.g.: 1 16
+;;; time-signature = numerator denominator, e.g.: 4 4
;;;
;;; unspecified or wildcard entries for duration or time-signature
;;; are given by * *
;;; maybe do: '(end shortest-1 16 time-3 4) ?
-;;; in 3 2 time:
-;;; end beams each 1 2 note
-;;; end beams with 16th notes each 1 4 note
-;;; end beams with 32th notes each 1 8 note
+(define-public default-auto-beam-settings
+ `(
+ ;; in 3 2 time:
+ ;; end beams each 1 2 note
+ ;; end beams with 16th notes each 1 4 note
+ ;; end beams with 32nd notes each 1 8 note
-(define auto-beam-settings
- `(
- ((end * * 3 2) . ,(make-moment 1 2))
- ((end 1 16 3 2) . ,(make-moment 1 4))
- ((end 1 32 3 2) . ,(make-moment 1 8))
+ ((end * * 3 2) . ,(ly:make-moment 1 2))
+ ((end * * 3 2) . ,(ly:make-moment 2 2))
- ((begin 1 8 3 4) . ,(make-moment 1 4))
+ ((end 1 16 3 2) . ,(ly:make-moment 1 4))
+ ((end 1 16 3 2) . ,(ly:make-moment 1 2))
+ ((end 1 16 3 2) . ,(ly:make-moment 3 4))
+ ((end 1 16 3 2) . ,(ly:make-moment 5 4))
- ((end * * 3 4) . ,(make-moment 3 4))
- ((begin 1 16 3 4) . ,(make-moment 1 16))
- ((end 1 16 3 4) . ,(make-moment 1 4))
- ;;((begin 1 32 3 4) . ,(make-moment 1 8))
- ((end 1 32 3 4) . ,(make-moment 1 8))
+ ((end 1 32 3 2) . ,(ly:make-moment 1 8))
+ ((end 1 32 3 2) . ,(ly:make-moment 1 4))
+ ((end 1 32 3 2) . ,(ly:make-moment 3 8))
+ ((end 1 32 3 2) . ,(ly:make-moment 1 2))
+ ((end 1 32 3 2) . ,(ly:make-moment 5 8))
+ ((end 1 32 3 2) . ,(ly:make-moment 3 4))
+ ((end 1 32 3 2) . ,(ly:make-moment 7 8))
+ ((end 1 32 3 2) . ,(ly:make-moment 9 8))
+ ((end 1 32 3 2) . ,(ly:make-moment 5 4))
+ ((end 1 32 3 2) . ,(ly:make-moment 11 8))
- ((begin 1 16 3 8) . ,(make-moment 1 8))
- ((end * * 3 8) . ,(make-moment 3 8))
+ ((end * * 3 4) . ,(ly:make-moment 3 4))
- ;; in common time:
- ;; end beams each 1 2 note
- ;; end beams with 32th notes each 1 8 note
- ;; end beams with 1 8 triplets each 1 4 note
+ ((end 1 16 3 4) . ,(ly:make-moment 1 4))
+ ((end 1 16 3 4) . ,(ly:make-moment 1 2))
- ((end * * 4 4) . ,(make-moment 1 2))
- ((end 1 12 4 4) . ,(make-moment 1 4))
- ((end 1 16 4 4) . ,(make-moment 1 4))
- ((end 1 32 4 4) . ,(make-moment 1 8))
+ ((end 1 32 3 4) . ,(ly:make-moment 1 8))
+ ((end 1 32 3 4) . ,(ly:make-moment 1 4))
+ ((end 1 32 3 4) . ,(ly:make-moment 3 8))
+ ((end 1 32 3 4) . ,(ly:make-moment 1 2))
+ ((end 1 32 3 4) . ,(ly:make-moment 5 8))
- ((end * * 2 4) . ,(make-moment 1 4))
- ((end 1 12 2 4) . ,(make-moment 1 4))
- ((end 1 16 2 4) . ,(make-moment 1 4))
- ((end 1 32 2 4) . ,(make-moment 1 8))
+ ((end * * 3 8) . ,(ly:make-moment 3 8))
+ ;; in common time:
+ ;; end beams each 1 2 note
+ ;; end beams with 32nd notes each 1 8 note
+ ;; end beams with 1 8 triplets each 1 4 note
- ((end * * 4 8) . ,(make-moment 1 4))
- ((end 1 16 4 8) . ,(make-moment 1 4))
- ((end 1 32 4 8) . ,(make-moment 1 8))
+ ((end * * 4 4) . ,(ly:make-moment 1 2))
+ ((end 1 12 4 4) . ,(ly:make-moment 1 4))
+ ((end 1 12 4 4) . ,(ly:make-moment 3 4))
- ((end * * 4 16) . ,(make-moment 1 8))
+ ((end 1 16 4 4) . ,(ly:make-moment 1 4))
+ ((end 1 16 4 4) . ,(ly:make-moment 3 4))
- ((end * * 6 8) . ,(make-moment 3 8))
- ((end 1 16 6 8) . ,(make-moment 3 8))
- ((end 1 32 6 8) . ,(make-moment 1 8))
+ ((end 1 32 4 4) . ,(ly:make-moment 1 8))
+ ((end 1 32 4 4) . ,(ly:make-moment 1 4))
+ ((end 1 32 4 4) . ,(ly:make-moment 3 8))
+ ((end 1 32 4 4) . ,(ly:make-moment 5 8))
+ ((end 1 32 4 4) . ,(ly:make-moment 3 4))
+ ((end 1 32 4 4) . ,(ly:make-moment 7 8))
- ((end * * 9 8) . ,(make-moment 3 8))
- ((end 1 16 9 8) . ,(make-moment 3 8))
- ((end 1 32 9 8) . ,(make-moment 1 8))
+ ((end * * 2 4) . ,(ly:make-moment 1 4))
+ ((end 1 32 2 4) . ,(ly:make-moment 1 8))
+ ((end 1 32 2 4) . ,(ly:make-moment 3 8))
- ((end * * 12 8) . ,(make-moment 3 8))
- ((end 1 16 12 8) . ,(make-moment 3 8))
- ((end 1 32 12 8) . ,(make-moment 1 8))
- (meta . ,(element-description "AutoBeam"))
- ))
+ ((end * * 4 8) . ,(ly:make-moment 1 4))
+ ((end 1 32 4 8) . ,(ly:make-moment 1 8))
+ ((end 1 32 4 8) . ,(ly:make-moment 3 8))
-;;; Users may override in most cases, simply by issuing
-;;;
-;;; % from here on consider ending beam every 1 4 note
-;;; \property Voice.AutoBeam \push #'(end * * * *) = #(make-moment 1 4)
-;;;
-;;; % no autobeaming
-;;; \property Voice.beamAuto = ##f
-;;;
-;;; or, more globally, by doing:
-;;;
-;;; \paper{
-;;; \translator{
-;;; \VoiceContext
-;;; % consider ending beam at every 1 2 note
-;;; AutoBeam \push #'(end * * * *) = #(make-moment 1 2)
-;;; }
-;;; }
-;;;
-;;; see also input test auto-beam-override.ly
+ ((end * * 4 16) . ,(ly:make-moment 1 8))
+
+ ;; in 6 8, 9 8 and 12 8 time:
+ ;; use beatGrouping for all except 1 32nd notes
+ ;; end beams with 32nd notes every 1 8 note
+
+ ((end 1 32 6 8) . ,(ly:make-moment 1 8))
+ ((end 1 32 6 8) . ,(ly:make-moment 2 8))
+ ((end 1 32 6 8) . ,(ly:make-moment 3 8))
+ ((end 1 32 6 8) . ,(ly:make-moment 4 8))
+ ((end 1 32 6 8) . ,(ly:make-moment 5 8))
+
+ ((end 1 32 9 8) . ,(ly:make-moment 1 8))
+ ((end 1 32 9 8) . ,(ly:make-moment 2 8))
+ ((end 1 32 9 8) . ,(ly:make-moment 3 8))
+ ((end 1 32 9 8) . ,(ly:make-moment 4 8))
+ ((end 1 32 9 8) . ,(ly:make-moment 5 8))
+ ((end 1 32 9 8) . ,(ly:make-moment 6 8))
+ ((end 1 32 9 8) . ,(ly:make-moment 7 8))
+ ((end 1 32 9 8) . ,(ly:make-moment 8 8))
+
+ ((end 1 32 12 8) . ,(ly:make-moment 1 8))
+ ((end 1 32 12 8) . ,(ly:make-moment 2 8))
+ ((end 1 32 12 8) . ,(ly:make-moment 3 8))
+ ((end 1 32 12 8) . ,(ly:make-moment 4 8))
+ ((end 1 32 12 8) . ,(ly:make-moment 5 8))
+ ((end 1 32 12 8) . ,(ly:make-moment 6 8))
+ ((end 1 32 12 8) . ,(ly:make-moment 7 8))
+ ((end 1 32 12 8) . ,(ly:make-moment 8 8))
+ ((end 1 32 12 8) . ,(ly:make-moment 9 8))
+ ((end 1 32 12 8) . ,(ly:make-moment 10 8))
+ ((end 1 32 12 8) . ,(ly:make-moment 11 8))
+ ))
+
+(define (override-property-setting context property setting value)
+ "Like the C++ code that executes \\override, but without type
+checking. "
+ (ly:context-set-property!
+ context property
+ (cons (cons setting value) (ly:context-property context property))))
+
+(define (revert-property-setting context property setting)
+ "Like the C++ code that executes \revert, but without type
+checking. "
+
+ (define (revert-member alist entry new)
+ "Return ALIST, with ENTRY removed. ALIST is not modified, instead
+a fresh copy of the list-head is made."
+ (cond
+ ((null? alist) new)
+ ((equal? (car alist) entry) (revert-member (cdr alist) entry new))
+ (else (revert-member (cdr alist) entry (cons (car alist) new)))))
+
+ (ly:context-set-property!
+ context property
+ (revert-member (ly:context-property context property) setting '())))
+
+(define-public (override-auto-beam-setting setting num den . rest)
+ (ly:export
+ (context-spec-music
+ (make-apply-context (lambda (c)
+ (override-property-setting
+ c 'autoBeamSettings
+ setting (ly:make-moment num den))))
+ (if (and (pair? rest) (symbol? (car rest)))
+ (car rest)
+ 'Voice))))
+
+(define-public (score-override-auto-beam-setting setting num den)
+ (override-auto-beam-setting setting num den 'Score))
+
+(define-public (revert-auto-beam-setting setting num den . rest)
+ (ly:export
+ (context-spec-music
+ (make-apply-context (lambda (c)
+ (revert-property-setting
+ c 'autoBeamSettings
+ (cons setting (ly:make-moment num den)))))
+ (if (and (pair? rest) (symbol? (car rest)))
+ (car rest)
+ 'Voice))))
+
+;; Determine end moment for auto beaming (or begin moment, but mostly
+;; 0== anywhere). In order of decreasing priority:
+;;
+;; 1. end <type> * *
+;; 2. end * * *
+;; 3. end <type> <num> <den>
+;; 4. end * <num> <den>
+;; 5. if 1-4 not specified, begin anywhere, end at time determined by
+;; beatGrouping and beatLength:
+;; if beatGrouping and beatLength are consistent with measureLength,
+;; use beatGrouping to determine end of beams.
+;; if beatGrouping and beatLength are inconsistent with measureLength,
+;; use beatLength to determine end of beams.
+;;
+;; Rationale:
+;;
+;; [user override]
+;; 1. override for specific duration type
+;; 2. generic override
+;;
+;; [to be defined in config file]
+;; 3. exceptions for specific time signature, for specific duration type
+;; 4. exceptions for specific time signature
+;; 5. easy catch-all rule for non-specified measure types
+
+
+(define-public (default-auto-beam-check context dir test)
+ (define (get name default)
+ (let ((value (ly:context-property context name)))
+ (if (not (null? value)) value default)))
+
+ (define (ending-moments group-list start-beat beat-length)
+ (if (null? group-list)
+ '()
+ (let ((new-start (+ start-beat (car group-list))))
+ (cons (ly:moment-mul (ly:make-moment new-start 1) beat-length)
+ (ending-moments (cdr group-list) new-start beat-length)))))
+ (define (make-end-settings time ending-list moment-den)
+ (if (null? ending-list)
+ '()
+ (cons (cons (append '(end * *) time)
+ (ly:make-moment (car ending-list) moment-den))
+ (make-end-settings time (cdr ending-list) moment-den))))
+
+ ;; Don't start auto beams on grace notes
+ (if (and (!= (ly:moment-grace-numerator (ly:context-now context)) 0)
+ (= dir START))
+ #f
+ (let* ((beat-length (get 'beatLength (ly:make-moment 1 4)))
+ (measure-length (get 'measureLength (ly:make-moment 1 1)))
+ (measure-pos (get 'measurePosition ZERO-MOMENT))
+ (beat-grouping (get 'beatGrouping '()))
+ (settings (get 'autoBeamSettings '()))
+ (function (list (if (= dir START) 'begin 'end)))
+ ;; Calculate implied time signature based on measureLength
+ ;; and beatLength for default value in get
+ (num-mom (ly:moment-div measure-length beat-length))
+ (num (inexact->exact
+ (round (/ (ly:moment-main-numerator num-mom)
+ (ly:moment-main-denominator num-mom)))))
+ (den (ly:moment-main-denominator beat-length))
+ (time-signature-fraction
+ (get 'timeSignatureFraction (cons num den)))
+ (time (list (car time-signature-fraction)
+ (cdr time-signature-fraction)))
+ (type (list (ly:moment-main-numerator test)
+ (ly:moment-main-denominator test)))
+ (pos (if (>= (ly:moment-main-numerator measure-pos) 0)
+ measure-pos
+ (ly:moment-add measure-length measure-pos)))
+ (grouping-moments (ending-moments beat-grouping 0 beat-length))
+ ;; Calculate implied measure length from beatGrouping
+ ;; and beatLength
+ (grouping-length (if (null? grouping-moments)
+ ZERO-MOMENT
+ (list-ref grouping-moments
+ (1- (length grouping-moments)))))
+ (lst (list
+ ;; Hmm, should junk user-override feature,
+ ;; or split this in user-override and config section?
+ (append function type '(* *))
+ (append function '(* * * *))
+ (append function type time)
+ (append function '(* *) time)))
+ (predefined-setting (first-assoc lst settings)))
+ (if (or
+ ;; always begin or end beams at beginning/ending of measure
+ (= (ly:moment-main-numerator pos) 0)
+ (first-member (map (lambda (x) (cons x pos)) lst) settings))
+ #t
+ (if (= dir START)
+ ;; if no entry matches our function + time or type,
+ ;; start anywhere
+ (not predefined-setting)
+ ;; if entry matches our function + time or type, check moment
+ (if predefined-setting
+ (equal? measure-pos (cdr predefined-setting))
+ ;; if measure-length matches grouping-length, use
+ ;; grouping moments, else use beat-length
+ (if (equal? measure-length grouping-length)
+ (member measure-pos grouping-moments)
+ (= (ly:moment-main-denominator
+ (ly:moment-div pos beat-length)) 1))))))))
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