scm/define-music-display-methods.scm

   1 ;;; define-music-display-methods.scm -- data for displaying music
   2 ;;; expressions using LilyPond notation.
   3 ;;;
   4 ;;; (c) 2005--2006 Nicolas Sceaux  <nicolas.sceaux@free.fr>
   5 ;;;
   6
   7 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
   8 ;;;
   9 ;;; Display method implementation
  10 ;;;
  11
  12 (define-module (scm display-lily))
  13
  14 ;;;
  15 ;;; Scheme forms
  16 ;;;
  17 (define (scheme-expr->lily-string scm-arg)
  18   (cond ((or (number? scm-arg)
  19              (string? scm-arg))
  20          (format #f "~s" scm-arg))
  21         ((or (symbol? scm-arg)
  22              (list? scm-arg))
  23          (format #f "'~s" scm-arg))
  24         ((procedure? scm-arg)
  25          (format #f "~a"
  26                  (or (procedure-name scm-arg)
  27                      (with-output-to-string
  28                        (lambda ()
  29                          (pretty-print (procedure-source scm-arg)))))))
  30         (else
  31          (format #f "~a"
  32                  (with-output-to-string
  33                    (lambda ()
  34                      (display-scheme-music scm-arg)))))))
  35 ;;;
  36 ;;; Markups
  37 ;;;
  38
  39 (define-public (markup->lily-string markup-expr)
  40   "Return a string describing, in LilyPond syntax, the given markup expression."
  41   (define (proc->command proc)
  42     (let ((cmd-markup (symbol->string (procedure-name proc))))
  43       (substring cmd-markup 0 (- (string-length cmd-markup)
  44                                  (string-length "-markup")))))
  45   (define (arg->string arg)
  46     (cond ((string? arg)
  47            (format #f "~s" arg))
  48           ((markup? arg) ;; a markup
  49            (markup->lily-string-aux arg))
  50           ((and (pair? arg) (every markup? arg)) ;; a markup list
  51            (format #f "{~{ ~a~}}" (map-in-order markup->lily-string-aux arg)))
  52           (else          ;; a scheme argument
  53            (format #f "#~a" (scheme-expr->lily-string arg)))))
  54   (define (markup->lily-string-aux expr)
  55     (if (string? expr)
  56         (format #f "~s" expr)
  57         (let ((cmd (car expr))
  58               (args (cdr expr)))
  59           (if (eqv? cmd simple-markup) ;; a simple markup
  60               (format #f "~s" (car args))
  61               (format #f "\\~a~{ ~a~}"
  62                       (proc->command cmd)
  63                       (map-in-order arg->string args))))))
  64   (cond ((string? markup-expr)
  65          (format #f "~s" markup-expr))
  66         ((eqv? (car markup-expr) simple-markup)
  67          (format #f "~s" (second markup-expr)))
  68         (else
  69          (format #f "\\markup ~a"
  70                  (markup->lily-string-aux markup-expr)))))
  71
  72 ;;;
  73 ;;; pitch names
  74 ;;;
  75
  76 ;; It is a pity that there is no rassoc in Scheme.
  77 (define* (rassoc item alist #:optional (test equal?))
  78   (do ((alist alist (cdr alist))
  79        (result #f result))
  80       ((or result (null? alist)) result)
  81     (if (and (car alist) (test item (cdar alist)))
  82         (set! result (car alist)))))
  83
  84 (define (note-name->lily-string ly-pitch parser)
  85   ;; here we define a custom pitch= function, since we do not want to
  86   ;; test whether octaves are also equal. (otherwise, we would be using equal?)
  87   (define (pitch= pitch1 pitch2)
  88     (and (= (ly:pitch-notename pitch1) (ly:pitch-notename pitch2))
  89          (= (ly:pitch-alteration pitch1) (ly:pitch-alteration pitch2))))
  90   (let ((result (rassoc ly-pitch (ly:parser-lookup parser 'pitchnames) pitch=)))
  91     (if result
  92         (car result)
  93         #f)))
  94
  95 (define (octave->lily-string pitch)
  96   (let ((octave (ly:pitch-octave pitch)))
  97     (cond ((>= octave 0)
  98            (make-string (1+ octave) #\'))
  99           ((< octave -1)
 100            (make-string (1- (* -1 octave)) #\,))
 101           (else ""))))
 102
 103 ;;;
 104 ;;; durations
 105 ;;;
 106 (define* (duration->lily-string ly-duration #:key (prev-duration (*previous-duration*))
 107                         (force-duration (*force-duration*))
 108                         (time-factor-numerator (*time-factor-numerator*))
 109                         (time-factor-denominator (*time-factor-denominator*)))
 110   (let ((log2    (ly:duration-log ly-duration))
 111         (dots    (ly:duration-dot-count ly-duration))
 112         (num+den (ly:duration-factor ly-duration)))
 113     (if (or force-duration (not prev-duration) (not (equal? ly-duration prev-duration)))
 114         (string-append (case log2
 115                          ((-1) "\\breve")
 116                          ((-2) "\\longa")
 117                          ((-3) "\\maxima")
 118                          (else (number->string (expt 2 log2))))
 119                        (make-string dots #\.)
 120                        (let ((num? (not (or (= 1 (car num+den))
 121                                             (and time-factor-numerator
 122                                                  (= (car num+den) time-factor-numerator)))))
 123                              (den? (not (or (= 1 (cdr num+den))
 124                                             (and time-factor-denominator
 125                                                  (= (cdr num+den) time-factor-denominator))))))
 126                          (cond (den?
 127                                 (format #f "*~a/~a" (car num+den) (cdr num+den)))
 128                                (num?
 129                                 (format #f "*~a" (car num+den)))
 130                                (else ""))))
 131         "")))
 132
 133 ;;;
 134 ;;; post events
 135 ;;;
 136
 137 (define post-event? (make-music-type-predicate
 138                      'StringNumberEvent
 139                      'ArticulationEvent
 140                      'FingeringEvent
 141                      'TextScriptEvent
 142                      'MultiMeasureTextEvent
 143                      'HyphenEvent
 144                      'ExtenderEvent
 145                      'BeamEvent
 146                      'SlurEvent
 147                      'TieEvent
 148                      'CrescendoEvent
 149                      'DecrescendoEvent
 150                      'PhrasingSlurEvent
 151                      'TremoloEvent
 152                      'SustainEvent
 153                      'SostenutoEvent
 154                      'TextSpanEvent
 155                      'HarmonicEvent
 156                      'BeamForbidEvent
 157                      'AbsoluteDynamicEvent
 158                      'TrillSpanEvent
 159                      'GlissandoEvent
 160                      'ArpeggioEvent
 161                      'NoteGroupingEvent
 162                      'UnaCordaEvent))
 163
 164 (define* (event-direction->lily-string event #:optional (required #t))
 165   (let ((direction (ly:music-property event 'direction)))
 166     (cond ((or (not direction) (null? direction) (= CENTER direction))
 167            (if required "-" ""))
 168           ((= UP direction) "^")
 169           ((= DOWN direction) "_")
 170           (else ""))))
 171
 172 (define-macro (define-post-event-display-method type vars direction-required str)
 173   `(define-display-method ,type ,vars
 174      (format #f "~a~a"
 175              (event-direction->lily-string ,(car vars) ,direction-required)
 176              ,str)))
 177
 178 (define-macro (define-span-event-display-method type vars direction-required str-start str-stop)
 179   `(define-display-method ,type ,vars
 180      (format #f "~a~a"
 181              (event-direction->lily-string ,(car vars) ,direction-required)
 182              (if (= START (ly:music-property ,(car vars) 'span-direction))
 183                  ,str-start
 184                  ,str-stop))))
 185
 186 (define-display-method HyphenEvent (event parser)
 187   " --")
 188 (define-display-method ExtenderEvent (event parser)
 189   " __")
 190 (define-display-method TieEvent (event parser)
 191   " ~")
 192 (define-display-method BeamForbidEvent (event parser)
 193   "\\noBeam")
 194 (define-display-method StringNumberEvent (event parser)
 195   (format #f "\\~a" (ly:music-property event 'string-number)))
 196
 197
 198 (define-display-method TremoloEvent (event parser)
 199   (let ((tremolo-type (ly:music-property event 'tremolo-type)))
 200     (format #f ":~a" (if (= 0 tremolo-type)
 201                          ""
 202                          tremolo-type))))
 203
 204 (define-post-event-display-method ArticulationEvent (event parser) #t
 205   (let ((articulation  (ly:music-property event 'articulation-type)))
 206     (case (string->symbol articulation)
 207       ((marcato) "^")
 208       ((stopped) "+")
 209       ((tenuto)  "-")
 210       ((staccatissimo) "|")
 211       ((accent) ">")
 212       ((staccato) ".")
 213       ((portato) "_")
 214       (else (format #f "\\~a" articulation)))))
 215
 216 (define-post-event-display-method FingeringEvent (event parser) #t
 217   (ly:music-property event 'digit))
 218
 219 (define-post-event-display-method TextScriptEvent (event parser) #t
 220   (markup->lily-string (ly:music-property event 'text)))
 221
 222 (define-post-event-display-method MultiMeasureTextEvent (event parser) #t
 223   (markup->lily-string (ly:music-property event 'text)))
 224
 225 (define-post-event-display-method HarmonicEvent (event parser) #t "\\harmonic")
 226 (define-post-event-display-method GlissandoEvent (event parser) #t "\\glissando")
 227 (define-post-event-display-method ArpeggioEvent (event parser) #t "\\arpeggio")
 228 (define-post-event-display-method AbsoluteDynamicEvent (event parser) #f
 229   (format #f "\\~a" (ly:music-property event 'text)))
 230
 231 (define-span-event-display-method BeamEvent (event parser) #f "[" "]")
 232 (define-span-event-display-method SlurEvent (event parser) #f "(" ")")
 233 (define-span-event-display-method CrescendoEvent (event parser) #f "\\<" "\\!")
 234 (define-span-event-display-method DecrescendoEvent (event parser) #f "\\>" "\\!")
 235 (define-span-event-display-method PhrasingSlurEvent (event parser) #f "\\(" "\\)")
 236 (define-span-event-display-method SustainEvent (event parser) #f "\\sustainDown" "\\sustainUp")
 237 (define-span-event-display-method SostenutoEvent (event parser) #f "\\sostenutoDown" "\\sostenutoUp")
 238 (define-span-event-display-method TextSpanEvent (event parser) #f "\\startTextSpan" "\\stopTextSpan")
 239 (define-span-event-display-method TrillSpanEvent (event parser) #f "\\startTrillSpan" "\\stopTrillSpan")
 240 (define-span-event-display-method StaffSpanEvent (event parser) #f "\\startStaff" "\\stopStaff")
 241 (define-span-event-display-method NoteGroupingEvent (event parser) #f "\\startGroup" "\\stopGroup")
 242 (define-span-event-display-method UnaCordaEvent (event parser) #f "\\unaCorda" "\\treCorde")
 243
 244 ;;;
 245 ;;; Graces
 246 ;;;
 247
 248 (define-display-method GraceMusic (expr parser)
 249   (format #f "\\grace ~a"
 250           (music->lily-string (ly:music-property expr 'element) parser)))
 251
 252 ;; \acciaccatura \appoggiatura \grace
 253 ;; TODO: it would be better to compare ?start and ?stop
 254 ;; with startAppoggiaturaMusic and stopAppoggiaturaMusic,
 255 ;; using a custom music equality predicate.
 256 (define-extra-display-method GraceMusic (expr parser)
 257   "Display method for appoggiatura."
 258   (with-music-match (expr (music
 259                            'GraceMusic
 260                            element (music
 261                                     'SequentialMusic
 262                                     elements (?start
 263                                               ?music
 264                                               ?stop))))
 265     ;; we check whether ?start and ?stop look like
 266     ;; startAppoggiaturaMusic stopAppoggiaturaMusic
 267     (and (with-music-match (?start (music
 268                                     'SequentialMusic
 269                                     elements ((music
 270                                                'EventChord
 271                                                elements ((music
 272                                                           'SkipEvent
 273                                                           duration (ly:make-duration 0 0 0 1))
 274                                                          (music
 275                                                           'SlurEvent
 276                                                           span-direction START))))))
 277                            #t)
 278           (with-music-match (?stop (music
 279                                     'SequentialMusic
 280                                     elements ((music
 281                                                'EventChord
 282                                                elements ((music
 283                                                           'SkipEvent
 284                                                           duration (ly:make-duration 0 0 0 1))
 285                                                          (music
 286                                                           'SlurEvent
 287                                                           span-direction STOP))))))
 288             (format #f "\\appoggiatura ~a" (music->lily-string ?music parser))))))
 289
 290
 291 (define-extra-display-method GraceMusic (expr parser)
 292   "Display method for acciaccatura."
 293   (with-music-match (expr (music
 294                            'GraceMusic
 295                            element (music
 296                                     'SequentialMusic
 297                                     elements (?start
 298                                               ?music
 299                                               ?stop))))
 300     ;; we check whether ?start and ?stop look like
 301     ;; startAcciaccaturaMusic stopAcciaccaturaMusic
 302     (and (with-music-match (?start (music
 303                                     'SequentialMusic
 304                                     elements ((music
 305                                                'EventChord
 306                                                elements ((music
 307                                                           'SkipEvent
 308                                                           duration (ly:make-duration 0 0 0 1))
 309                                                          (music
 310                                                           'SlurEvent
 311                                                           span-direction START)))
 312                                               (music
 313                                                'ContextSpeccedMusic
 314                                                element (music
 315                                                         'OverrideProperty
 316                                                         grob-property-path '(stroke-style)
 317                                                         grob-value "grace"
 318                                                         symbol 'Stem)))))
 319                            #t)
 320          (with-music-match (?stop (music
 321                                    'SequentialMusic
 322                                    elements ((music
 323                                               'ContextSpeccedMusic
 324                                               element (music
 325                                                        'RevertProperty
 326                                                        grob-property-path '(stroke-style)
 327                                                        symbol 'Stem))
 328                                              (music
 329                                               'EventChord
 330                                               elements ((music
 331                                                          'SkipEvent
 332                                                          duration (ly:make-duration 0 0 0 1))
 333                                                         (music
 334                                                          'SlurEvent
 335                                                          span-direction STOP))))))
 336            (format #f "\\acciaccatura ~a" (music->lily-string ?music parser))))))
 337
 338 (define-extra-display-method GraceMusic (expr parser)
 339   "Display method for grace."
 340   (with-music-match (expr (music
 341                            'GraceMusic
 342                            element (music
 343                                     'SequentialMusic
 344                                     elements (?start
 345                                               ?music
 346                                               ?stop))))
 347     ;; we check whether ?start and ?stop look like
 348     ;; startGraceMusic stopGraceMusic
 349     (and (null? (ly:music-property ?start 'elements))
 350          (null? (ly:music-property ?stop 'elements))
 351          (format #f "\\grace ~a" (music->lily-string ?music parser)))))
 352
 353 ;;;
 354 ;;; Music sequences
 355 ;;;
 356
 357 (define-display-method SequentialMusic (seq parser)
 358   (let ((force-line-break (and (*force-line-break*)
 359                                ;; hm
 360                                (> (length (ly:music-property seq 'elements))
 361                                   (*max-element-number-before-break*))))
 362         (elements (ly:music-property seq 'elements))
 363         (chord? (make-music-type-predicate 'EventChord))
 364         (cluster? (make-music-type-predicate 'ClusterNoteEvent))
 365         (note? (make-music-type-predicate 'NoteEvent)))
 366     (format #f "~a~a{~v%~v_~{~a ~}~v%~v_}"
 367             (if (any (lambda (e)
 368                        (and (chord? e)
 369                             (any cluster? (ly:music-property e 'elements))))
 370                      elements)
 371                 "\\makeClusters "
 372                 "")
 373             (if (*explicit-mode*)
 374                 ;; if the sequence contains EventChord which contains figures ==> figuremode
 375                 ;; if the sequence contains EventChord which contains lyrics ==> lyricmode
 376                 ;; if the sequence contains EventChord which contains drum notes ==> drummode
 377                 (cond ((any (lambda (chord)
 378                               (any (make-music-type-predicate 'BassFigureEvent)
 379                                    (ly:music-property chord 'elements)))
 380                             (filter chord? elements))
 381                        "\\figuremode ")
 382                       ((any (lambda (chord)
 383                               (any (make-music-type-predicate 'LyricEvent)
 384                                    (ly:music-property chord 'elements)))
 385                             (filter chord? elements))
 386                        "\\lyricmode ")
 387                       ((any (lambda (chord)
 388                               (any (lambda (event)
 389                                      (and (note? event)
 390                                           (not (null? (ly:music-property event 'drum-type)))))
 391                                    (ly:music-property chord 'elements)))
 392                             (filter chord? elements))
 393                        "\\drummode ")
 394                       (else ;; TODO: other modes?
 395                        ""))
 396                 "")
 397             (if force-line-break 1 0)
 398             (if force-line-break (+ 2 (*indent*)) 1)
 399             (parameterize ((*indent* (+ 2 (*indent*))))
 400                           (map-in-order (lambda (music)
 401                                           (music->lily-string music parser))
 402                                         elements))
 403             (if force-line-break 1 0)
 404             (if force-line-break (*indent*) 0))))
 405
 406 (define-display-method SimultaneousMusic (sim parser)
 407   (parameterize ((*indent* (+ 3 (*indent*))))
 408     (format #f "<< ~{~a ~}>>"
 409             (map-in-order (lambda (music)
 410                             (music->lily-string music parser))
 411                           (ly:music-property sim 'elements)))))
 412
 413 (define-extra-display-method SimultaneousMusic (expr parser)
 414   "If `sim' is an \afterGrace expression, return \"\\afterGrace ...\".
 415 Otherwise, return #f."
 416   ;; TODO: do something with afterGraceFraction?
 417   (with-music-match (expr (music 'SimultaneousMusic
 418                                  elements (?before-grace
 419                                            (music 'SequentialMusic
 420                                                   elements ((music 'SkipMusic)
 421                                                             (music 'GraceMusic
 422                                                                    element ?grace))))))
 423     (format #f "\\afterGrace ~a ~a"
 424             (music->lily-string ?before-grace parser)
 425             (music->lily-string ?grace parser))))
 426
 427 ;;;
 428 ;;; Chords
 429 ;;;
 430
 431 (define-display-method EventChord (chord parser)
 432   ;; event_chord : simple_element post_events
 433   ;;               | command_element
 434   ;;               | note_chord_element
 435
 436   ;; TODO : tagged post_events
 437   ;; post_events : ( post_event | tagged_post_event )*
 438   ;; tagged_post_event: '-' \tag embedded_scm post_event
 439
 440   (let* ((elements (ly:music-property chord 'elements))
 441          (simple-elements (filter (make-music-type-predicate
 442                                    'NoteEvent 'ClusterNoteEvent 'RestEvent
 443                                    'MultiMeasureRestEvent 'SkipEvent 'LyricEvent)
 444                                   elements)))
 445     (if ((make-music-type-predicate 'StaffSpanEvent 'BreathingEvent) (car elements))
 446         ;; first, a special case: StaffSpanEvent (\startStaff, \stopStaff)
 447         ;; and BreathingEvent (\breathe)
 448         (music->lily-string (car elements) parser)
 449         (if (and (not (null? simple-elements))
 450                  (null? (cdr simple-elements)))
 451             ;; simple_element : note | figure | rest | mmrest | lyric_element | skip
 452             (let* ((simple-element (car simple-elements))
 453                    (duration (ly:music-property simple-element 'duration))
 454                    (lily-string (format #f "~a~a~a~{~a ~}"
 455                                         (music->lily-string simple-element parser)
 456                                         (duration->lily-string duration)
 457                                         (if (and ((make-music-type-predicate 'RestEvent) simple-element)
 458                                                  (ly:pitch? (ly:music-property simple-element 'pitch)))
 459                                             "\\rest"
 460                                             "")
 461                                         (map-in-order (lambda (music)
 462                                                         (music->lily-string music parser))
 463                                                       (filter post-event? elements)))))
 464               (*previous-duration* duration)
 465               lily-string)
 466             (let ((chord-elements (filter (make-music-type-predicate
 467                                            'NoteEvent 'ClusterNoteEvent 'BassFigureEvent)
 468                                           elements))
 469                   (post-events (filter post-event? elements)))
 470               (if (not (null? chord-elements))
 471                   ;; note_chord_element : '<' (notepitch | drumpitch)* '>" duration post_events
 472                   (let ((lily-string (format #f "< ~{~a ~}>~a~{~a ~}"
 473                                              (map-in-order (lambda (music)
 474                                                              (music->lily-string music parser))
 475                                                            chord-elements)
 476                                              (duration->lily-string (ly:music-property (car chord-elements)
 477                                                                                      'duration))
 478                                              (map-in-order (lambda (music)
 479                                                              (music->lily-string music parser))
 480                                                            post-events))))
 481                     (*previous-duration* (ly:music-property (car chord-elements) 'duration))
 482                     lily-string)
 483                   ;; command_element
 484                   (format #f "~{~a ~}" (map-in-order (lambda (music)
 485                                                        (music->lily-string music parser))
 486                                                      elements))))))))
 487
 488 (define-display-method MultiMeasureRestMusic (mmrest parser)
 489   (let* ((dur (ly:music-property mmrest 'duration))
 490          (ly (format #f "R~a~{~a ~}"
 491                      (duration->lily-string dur)
 492                      (map-in-order (lambda (music)
 493                                      (music->lily-string music parser))
 494                                    (ly:music-property mmrest 'articulations)))))
 495     (*previous-duration* dur)
 496     ly))
 497
 498 (define-display-method SkipMusic (skip parser)
 499   (format #f "\\skip ~a" (duration->lily-string (ly:music-property skip 'duration) #:force-duration #t)))
 500
 501 ;;;
 502 ;;; Notes, rests, skips...
 503 ;;;
 504
 505 (define (simple-note->lily-string event parser)
 506   (format #f "~a~a~a~a~{~a~}" ; pitchname octave !? octave-check articulations
 507           (note-name->lily-string (ly:music-property event 'pitch) parser)
 508           (octave->lily-string (ly:music-property event 'pitch))
 509           (let ((forced (ly:music-property event 'force-accidental))
 510                 (cautionary (ly:music-property event 'cautionary)))
 511             (cond ((and (not (null? forced))
 512                         forced
 513                         (not (null? cautionary))
 514                         cautionary)
 515                    "?")
 516                   ((and (not (null? forced)) forced) "!")
 517                   (else "")))
 518           (let ((octave-check (ly:music-property event 'absolute-octave)))
 519             (if (not (null? octave-check))
 520                 (format #f "=~a" (cond ((>= octave-check 0)
 521                                         (make-string (1+ octave-check) #\'))
 522                                        ((< octave-check -1)
 523                                         (make-string (1- (* -1 octave-check)) #\,))
 524                                        (else "")))
 525                 ""))
 526           (map-in-order (lambda (event)
 527                           (music->lily-string event parser))
 528                         (ly:music-property event 'articulations))))
 529
 530 (define-display-method NoteEvent (note parser)
 531   (cond ((not (null? (ly:music-property note 'pitch))) ;; note
 532          (simple-note->lily-string note parser))
 533         ((not (null? (ly:music-property note 'drum-type))) ;; drum
 534          (format #f "~a" (ly:music-property note 'drum-type)))
 535         (else ;; unknown?
 536          "")))
 537
 538 (define-display-method ClusterNoteEvent (note parser)
 539   (simple-note->lily-string note parser))
 540
 541 (define-display-method RestEvent (rest parser)
 542   (if (not (null? (ly:music-property rest 'pitch)))
 543       (simple-note->lily-string rest parser)
 544       "r"))
 545
 546 (define-display-method MultiMeasureRestEvent (rest parser)
 547   "R")
 548
 549 (define-display-method SkipEvent (rest parser)
 550   "s")
 551
 552 (define-display-method MarkEvent (mark parser)
 553   (let ((label (ly:music-property mark 'label)))
 554     (if (null? label)
 555         "\\mark \\default"
 556         (format #f "\\mark ~a" (markup->lily-string label)))))
 557
 558 (define-display-method KeyChangeEvent (key parser)
 559   (let ((pitch-alist (ly:music-property key 'pitch-alist))
 560         (tonic (ly:music-property key 'tonic)))
 561     (if (or (null? pitch-alist)
 562             (null? tonic))
 563         "\\key \\default"
 564         (let ((c-pitch-alist (ly:transpose-key-alist pitch-alist
 565                                                      (ly:pitch-diff (ly:make-pitch 0 0 0) tonic))))
 566           (format #f "\\key ~a \\~a~a"
 567                   (note-name->lily-string (ly:music-property key 'tonic) parser)
 568                   (any (lambda (mode)
 569                          (if (and parser
 570                                   (equal? (ly:parser-lookup parser mode) c-pitch-alist))
 571                              (symbol->string mode)
 572                              #f))
 573                        '(major minor ionian locrian aeolian mixolydian lydian phrygian dorian))
 574                   (new-line->lily-string))))))
 575
 576 (define-display-method RelativeOctaveCheck (octave parser)
 577   (let ((pitch (ly:music-property octave 'pitch)))
 578     (format #f "\\octave ~a~a"
 579             (note-name->lily-string pitch parser)
 580             (octave->lily-string pitch))))
 581
 582 (define-display-method VoiceSeparator (sep parser)
 583   "\\\\")
 584
 585 (define-display-method LigatureEvent (ligature parser)
 586   (if (= START (ly:music-property ligature 'span-direction))
 587       "\\["
 588       "\\]"))
 589
 590 (define-display-method BarCheck (check parser)
 591   (format #f "|~a" (new-line->lily-string)))
 592
 593 (define-display-method PesOrFlexaEvent (expr parser)
 594   "\\~")
 595
 596 (define-display-method BassFigureEvent (figure parser)
 597   (let ((alteration (ly:music-property figure 'alteration))
 598         (fig (ly:music-property figure 'figure))
 599         (bracket-start (ly:music-property figure 'bracket-start))
 600         (bracket-stop (ly:music-property figure 'bracket-stop)))
 601     (format #f "~a~a~a~a"
 602             (if (null? bracket-start) "" "[")
 603             (cond ((null? fig) "_")
 604                   ((markup? fig) (second fig)) ;; fig: (<number-markup> "number")
 605                   (else fig))
 606             (if (null? alteration)
 607                 ""
 608                 (case alteration
 609                   ((-4) "--")
 610                   ((-2) "-")
 611                   ((0) "!")
 612                   ((2) "+")
 613                   ((4) "++")
 614                   (else "")))
 615             (if (null? bracket-stop) "" "]"))))
 616
 617 (define-display-method LyricEvent (lyric parser)
 618   (let ((text (ly:music-property lyric 'text)))
 619     (if (or (string? text)
 620             (eqv? (first text) simple-markup))
 621         ;; a string or a simple markup
 622         (let ((string (if (string? text)
 623                           text
 624                           (second text))))
 625           (if (string-match "(\"| |[0-9])" string)
 626               ;; TODO check exactly in which cases double quotes should be used
 627               (format #f "~s" string)
 628               string))
 629         (markup->lily-string text))))
 630
 631 (define-display-method BreathingEvent (event parser)
 632   "\\breathe")
 633
 634 ;;;
 635 ;;; Staff switches
 636 ;;;
 637
 638 (define-display-method AutoChangeMusic (m parser)
 639   (format #f "\\autochange ~a"
 640           (music->lily-string (ly:music-property m 'element) parser)))
 641
 642 (define-display-method ContextChange (m parser)
 643   (format #f "\\change ~a = \"~a\""
 644           (ly:music-property m 'change-to-type)
 645           (ly:music-property m 'change-to-id)))
 646
 647 ;;;
 648
 649 (define-display-method TimeScaledMusic (times parser)
 650   (let* ((num (ly:music-property times 'numerator))
 651          (den (ly:music-property times 'denominator))
 652          (nd-gcd (gcd num den)))
 653     (parameterize ((*force-line-break* #f)
 654                    (*time-factor-numerator* (/ num nd-gcd))
 655                    (*time-factor-denominator* (/ den nd-gcd)))
 656       (format #f "\\times ~a/~a ~a"
 657               num
 658               den
 659               (music->lily-string (ly:music-property times 'element) parser)))))
 660
 661 (define-display-method RelativeOctaveMusic (m parser)
 662   (music->lily-string (ly:music-property m 'element) parser))
 663
 664 (define-display-method TransposedMusic (m parser)
 665   (music->lily-string (ly:music-property m 'element) parser))
 666
 667 ;;;
 668 ;;; Repeats
 669 ;;;
 670
 671 (define (repeat->lily-string expr repeat-type parser)
 672   (format #f "\\repeat ~a ~a ~a ~a"
 673           repeat-type
 674           (ly:music-property expr 'repeat-count)
 675           (music->lily-string (ly:music-property expr 'element) parser)
 676           (let ((alternatives (ly:music-property expr 'elements)))
 677             (if (null? alternatives)
 678                 ""
 679                 (format #f "\\alternative { ~{~a ~}}"
 680                         (map-in-order (lambda (music)
 681                                         (music->lily-string music parser))
 682                                       alternatives))))))
 683
 684 (define-display-method VoltaRepeatedMusic (expr parser)
 685   (repeat->lily-string expr "volta" parser))
 686
 687 (define-display-method UnfoldedRepeatedMusic (expr parser)
 688   (repeat->lily-string expr "unfold" parser))
 689
 690 (define-display-method FoldedRepeatedMusic (expr parser)
 691   (repeat->lily-string expr "fold" parser))
 692
 693 (define-display-method PercentRepeatedMusic (expr parser)
 694   (repeat->lily-string expr "percent" parser))
 695
 696 (define-display-method TremoloRepeatedMusic (expr parser)
 697   (let* ((count (ly:music-property expr 'repeat-count))
 698          (dots (if (= 0 (modulo count 3)) 0 1))
 699          (shift (- (log2 (if (= 0 dots)
 700                              (/ (* count 2) 3)
 701                              count))))
 702          (element (ly:music-property expr 'element))
 703          (den-mult 1))
 704     (if (eqv? (ly:music-property element 'name) 'SequentialMusic)
 705         (begin
 706           (set! shift (1- shift))
 707           (set! den-mult (length (ly:music-property element 'elements)))))
 708     (music-map (lambda (m)
 709                  (let ((duration (ly:music-property m 'duration)))
 710                    (if (ly:duration? duration)
 711                        (let* ((dlog (ly:duration-log duration))
 712                               (ddots (ly:duration-dot-count duration))
 713                               (dfactor (ly:duration-factor duration))
 714                               (dnum (car dfactor))
 715                               (dden (cdr dfactor)))
 716                          (set! (ly:music-property m 'duration)
 717                                (ly:make-duration (- dlog shift)
 718                                                  ddots ;;(- ddots dots) ; ????
 719                                                  dnum
 720                                                  (/ dden den-mult))))))
 721                  m)
 722                element)
 723     (format #f "\\repeat tremolo ~a ~a"
 724             count
 725             (music->lily-string element parser))))
 726
 727 ;;;
 728 ;;; Contexts
 729 ;;;
 730
 731 (define-display-method ContextSpeccedMusic (expr parser)
 732   (let ((id    (ly:music-property expr 'context-id))
 733         (create-new (ly:music-property expr 'create-new))
 734         (music (ly:music-property expr 'element))
 735         (operations (ly:music-property expr 'property-operations))
 736         (ctype (ly:music-property expr 'context-type)))
 737     (format #f "~a ~a~a~a ~a"
 738             (if (and (not (null? create-new)) create-new)
 739                 "\\new"
 740                 "\\context")
 741             ctype
 742             (if (null? id)
 743                 ""
 744                 (format #f " = ~s" id))
 745             (if (null? operations)
 746                 ""
 747                 (format #f " \\with {~{~a~}~%~v_}"
 748                         (parameterize ((*indent* (+ (*indent*) 2)))
 749                           (map (lambda (op)
 750                                  (format #f "~%~v_\\~a ~s"
 751                                          (*indent*)
 752                                          (first op)
 753                                          (second op)))
 754                                (reverse operations)))
 755                         (*indent*)))
 756             (parameterize ((*current-context* ctype))
 757               (music->lily-string music parser)))))
 758
 759 ;; special cases: \figures \lyrics \drums
 760 (define-extra-display-method ContextSpeccedMusic (expr parser)
 761   (with-music-match (expr (music 'ContextSpeccedMusic
 762                                  create-new #t
 763                                  property-operations ?op
 764                                  context-type ?context-type
 765                                  element ?sequence))
 766     (if (null? ?op)
 767         (parameterize ((*explicit-mode* #f))
 768           (case ?context-type
 769             ((FiguredBass)
 770              (format #f "\\figures ~a" (music->lily-string ?sequence parser)))
 771             ((Lyrics)
 772              (format #f "\\lyrics ~a" (music->lily-string ?sequence parser)))
 773             ((DrumStaff)
 774              (format #f "\\drums ~a" (music->lily-string ?sequence parser)))
 775             (else
 776              #f)))
 777         #f)))
 778
 779 ;;; Context properties
 780
 781 (define-extra-display-method ContextSpeccedMusic (expr parser)
 782   (let ((element (ly:music-property expr 'element))
 783         (property-tuning? (make-music-type-predicate 'PropertySet
 784                                                      'PropertyUnset
 785                                                      'OverrideProperty
 786                                                      'RevertProperty))
 787         (sequence? (make-music-type-predicate 'SequentialMusic)))
 788     (if (and (ly:music? element)
 789              (or (property-tuning? element)
 790                  (and (sequence? element)
 791                       (every property-tuning? (ly:music-property element 'elements)))))
 792         (parameterize ((*current-context* (ly:music-property expr 'context-type)))
 793           (music->lily-string element parser))
 794         #f)))
 795
 796 (define (property-value->lily-string arg parser)
 797   (cond ((ly:music? arg)
 798          (music->lily-string arg parser))
 799         ((string? arg)
 800          (format #f "#~s" arg))
 801         ((markup? arg)
 802          (markup->lily-string arg))
 803         (else
 804          (format #f "#~a" (scheme-expr->lily-string arg)))))
 805
 806 (define-display-method PropertySet (expr parser)
 807   (let ((property (ly:music-property expr 'symbol))
 808         (value (ly:music-property expr 'value))
 809         (once (ly:music-property expr 'once)))
 810     (format #f "~a\\set ~a~a = ~a~a"
 811             (if (and (not (null? once)))
 812                 "\\once "
 813                 "")
 814             (if (eqv? (*current-context*) 'Bottom)
 815                 ""
 816                 (format #f "~a . " (*current-context*)))
 817             property
 818             (property-value->lily-string value parser)
 819             (new-line->lily-string))))
 820
 821 (define-display-method PropertyUnset (expr parser)
 822   (format #f "\\unset ~a~a~a"
 823           (if (eqv? (*current-context*) 'Bottom)
 824               ""
 825               (format #f "~a . " (*current-context*)))
 826           (ly:music-property expr 'symbol)
 827           (new-line->lily-string)))
 828
 829 ;;; Layout properties
 830
 831 (define-display-method OverrideProperty (expr parser)
 832   (let ((symbol   (ly:music-property expr 'symbol))
 833         (properties (ly:music-property expr 'grob-property-path))
 834         (value    (ly:music-property expr 'grob-value))
 835         (once     (ly:music-property expr 'once)))
 836     (format #f "~a\\override ~a~a #'~a = ~a~a"
 837             (if (or (null? once)
 838                     (not once))
 839                 ""
 840                 "\\once ")
 841             (if (eqv? (*current-context*) 'Bottom)
 842                 ""
 843                 (format #f "~a . " (*current-context*)))
 844             symbol
 845             (if (null? (cdr properties))
 846                 (car properties)
 847                 properties)
 848             (property-value->lily-string value parser)
 849             (new-line->lily-string))))
 850
 851 (define-display-method RevertProperty (expr parser)
 852   (let ((symbol (ly:music-property expr 'symbol))
 853         (properties (ly:music-property expr 'grob-property-path)))
 854     (format #f "\\revert ~a~a #'~a~a"
 855             (if (eqv? (*current-context*) 'Bottom)
 856                 ""
 857                 (format #f "~a . " (*current-context*)))
 858             symbol
 859             (if (null? (cdr properties))
 860                 (car properties)
 861                 properties)
 862             (new-line->lily-string))))
 863
 864 ;;; \melisma and \melismaEnd
 865 (define-extra-display-method ContextSpeccedMusic (expr parser)
 866   "If expr is a melisma, return \"\\melisma\", otherwise, return #f."
 867   (with-music-match (expr (music 'ContextSpeccedMusic
 868                                  element (music 'PropertySet
 869                                                 value #t
 870                                                 symbol 'melismaBusy)))
 871     "\\melisma"))
 872
 873 (define-extra-display-method ContextSpeccedMusic (expr parser)
 874   "If expr is a melisma end, return \"\\melismaEnd\", otherwise, return #f."
 875   (with-music-match (expr (music 'ContextSpeccedMusic
 876                                  element (music 'PropertyUnset
 877                                                 symbol 'melismaBusy)))
 878     "\\melismaEnd"))
 879
 880 ;;; \tempo
 881 (define-extra-display-method ContextSpeccedMusic (expr parser)
 882   "If expr is a tempo, return \"\\tempo x = nnn\", otherwise return #f."
 883   (with-music-match (expr (music 'ContextSpeccedMusic
 884                             element (music 'SequentialMusic
 885                                       elements ((music 'PropertySet
 886                                                   symbol 'tempoWholesPerMinute)
 887                                                 (music 'PropertySet
 888                                                   value ?unit-duration
 889                                                   symbol 'tempoUnitDuration)
 890                                                 (music 'PropertySet
 891                                                   value ?unit-count
 892                                                   symbol 'tempoUnitCount)))))
 893     (format #f "\\tempo ~a = ~a"
 894             (duration->lily-string ?unit-duration #:force-duration #t)
 895             ?unit-count)))
 896
 897 ;;; \clef
 898 (define clef-name-alist (map (lambda (name+vals)
 899                                (cons (cdr name+vals)
 900                                      (car name+vals)))
 901                              supported-clefs))
 902
 903 (define-extra-display-method ContextSpeccedMusic (expr parser)
 904   "If `expr' is a clef change, return \"\\clef ...\"
 905 Otherwise, return #f."
 906   (with-music-match (expr (music 'ContextSpeccedMusic
 907                                  context-type 'Staff
 908                                  element (music 'SequentialMusic
 909                                                 elements ((music 'PropertySet
 910                                                                  value ?clef-glyph
 911                                                                  symbol 'clefGlyph)
 912                                                           (music 'PropertySet
 913                                                                  symbol 'middleCPosition)
 914                                                           (music 'PropertySet
 915                                                                  value ?clef-position
 916                                                                  symbol 'clefPosition)
 917                                                           (music 'PropertySet
 918                                                                  value ?clef-octavation
 919                                                                  symbol 'clefOctavation)))))
 920     (let ((clef-prop+name (assoc (list ?clef-glyph ?clef-position 0)
 921                                  clef-name-alist)))
 922       (if clef-prop+name
 923           (format #f "\\clef \"~a~{~a~a~}\"~a"
 924                   (cdr clef-prop+name)
 925                   (cond ((= 0 ?clef-octavation)
 926                          (list "" ""))
 927                         ((> ?clef-octavation 0)
 928                          (list "^" (1+ ?clef-octavation)))
 929                         (else
 930                          (list "_" (- 1 ?clef-octavation))))
 931                   (new-line->lily-string))
 932           #f))))
 933
 934 ;;; \time
 935 (define-extra-display-method ContextSpeccedMusic (expr parser)
 936   "If `expr' is a time signature set, return \"\\time ...\".
 937 Otherwise, return #f."
 938   (with-music-match (expr (music
 939                            'ContextSpeccedMusic
 940                            element (music
 941                                     'ContextSpeccedMusic
 942                                     context-type 'Timing
 943                                     element (music
 944                                              'SequentialMusic
 945                                              elements ((music
 946                                                         'PropertySet
 947                                                         value ?num+den
 948                                                         symbol 'timeSignatureFraction)
 949                                                        (music
 950                                                         'PropertySet
 951                                                         symbol 'beatLength)
 952                                                        (music
 953                                                         'PropertySet
 954                                                         symbol 'measureLength)
 955                                                        (music
 956                                                         'PropertySet
 957                                                         value ?grouping
 958                                                         symbol 'beatGrouping))))))
 959     (if (null? ?grouping)
 960         (format #f "\\time ~a/~a~a" (car ?num+den) (cdr ?num+den) (new-line->lily-string))
 961         (format #f "#(set-time-signature ~a ~a '~s)~a"
 962                 (car ?num+den) (cdr ?num+den) ?grouping (new-line->lily-string)))))
 963
 964 ;;; \bar
 965 (define-extra-display-method ContextSpeccedMusic (expr parser)
 966   "If `expr' is a bar, return \"\\bar ...\".
 967 Otherwise, return #f."
 968   (with-music-match (expr (music 'ContextSpeccedMusic
 969                                  context-type 'Timing
 970                                  element (music 'PropertySet
 971                                                 value ?bar-type
 972                                                 symbol 'whichBar)))
 973      (format #f "\\bar \"~a\"~a" ?bar-type (new-line->lily-string))))
 974
 975 ;;; \partial
 976 (define (duration->moment ly-duration)
 977   (let ((log2    (ly:duration-log ly-duration))
 978         (dots    (ly:duration-dot-count ly-duration))
 979         (num+den (ly:duration-factor ly-duration)))
 980     (let* ((m (expt 2 (- log2)))
 981            (factor (/ (car num+den) (cdr num+den))))
 982       (/ (do ((i 0 (1+ i))
 983               (delta (/ m 2) (/ delta 2)))
 984              ((= i dots) m)
 985            (set! m (+ m delta)))
 986          factor))))
 987 (define moment-duration-alist (map (lambda (duration)
 988                                      (cons (duration->moment duration)
 989                                            duration))
 990                                    (append-map (lambda (log2)
 991                                                  (map (lambda (dots)
 992                                                         (ly:make-duration log2 dots 1 1))
 993                                                       (list 0 1 2 3)))
 994                                                (list 0 1 2 3 4))))
 995
 996 (define (moment->duration moment)
 997   (let ((result (assoc (- moment) moment-duration-alist =)))
 998     (and result
 999          (cdr result))))
1000
1001 (define-extra-display-method ContextSpeccedMusic (expr parser)
1002   "If `expr' is a partial measure, return \"\\partial ...\".
1003 Otherwise, return #f."
1004   (with-music-match (expr (music
1005                            'ContextSpeccedMusic
1006                            element (music
1007                                     'ContextSpeccedMusic
1008                                     context-type 'Timing
1009                                     element (music
1010                                              'PropertySet
1011                                              value ?moment
1012                                              symbol 'measurePosition))))
1013      (let ((duration (moment->duration (/ (ly:moment-main-numerator ?moment)
1014                                           (ly:moment-main-denominator ?moment)))))
1015        (and duration (format #f "\\partial ~a" (duration->lily-string duration
1016                                                  #:force-duration #t))))))
1017
1018 ;;;
1019 ;;;
1020
1021 (define-display-method ApplyOutputEvent (applyoutput parser)
1022   (let ((proc (ly:music-property applyoutput 'procedure))
1023         (ctx  (ly:music-property applyoutput 'context-type)))
1024     (format #f "\\applyOutput #'~a #~a"
1025             ctx
1026             (or (procedure-name proc)
1027                 (with-output-to-string
1028                   (lambda ()
1029                     (pretty-print (procedure-source proc))))))))
1030
1031 (define-display-method ApplyContext (applycontext parser)
1032   (let ((proc (ly:music-property applycontext 'procedure)))
1033     (format #f "\\applyContext #~a"
1034             (or (procedure-name proc)
1035                 (with-output-to-string
1036                   (lambda ()
1037                     (pretty-print (procedure-source proc))))))))
1038
1039 ;;; \partcombine
1040 (define-display-method PartCombineMusic (expr parser)
1041   (format #f "\\partcombine ~{~a ~}"
1042           (map-in-order (lambda (music)
1043                           (music->lily-string music parser))
1044                         (ly:music-property expr 'elements))))
1045
1046 (define-extra-display-method PartCombineMusic (expr parser)
1047   (with-music-match (expr (music 'PartCombineMusic
1048                                  elements ((music 'UnrelativableMusic
1049                                                   element (music 'ContextSpeccedMusic
1050                                                                  context-id "one"
1051                                                                  context-type 'Voice
1052                                                                  element ?sequence1))
1053                                            (music 'UnrelativableMusic
1054                                                   element (music 'ContextSpeccedMusic
1055                                                                  context-id "two"
1056                                                                  context-type 'Voice
1057                                                                  element ?sequence2)))))
1058     (format #f "\\partcombine ~a~a~a"
1059             (music->lily-string ?sequence1 parser)
1060             (new-line->lily-string)
1061             (music->lily-string ?sequence2 parser))))
1062
1063 (define-display-method UnrelativableMusic (expr parser)
1064   (music->lily-string (ly:music-property expr 'element) parser))
1065
1066 ;;; Cue notes
1067 (define-display-method QuoteMusic (expr parser)
1068   (or (with-music-match (expr (music
1069                                'QuoteMusic
1070                                quoted-voice-direction ?quoted-voice-direction
1071                                quoted-music-name ?quoted-music-name
1072                                quoted-context-id "cue"
1073                                quoted-context-type 'Voice
1074                                element ?music))
1075         (format #f "\\cueDuring #~s #~a ~a"
1076                 ?quoted-music-name
1077                 ?quoted-voice-direction
1078                 (music->lily-string ?music parser)))
1079       (format #f "\\quoteDuring #~s ~a"
1080               (ly:music-property expr 'quoted-music-name)
1081               (music->lily-string (ly:music-property expr 'element) parser))))
1082
1083 ;;;
1084 ;;; Breaks
1085 ;;;
1086 (define-display-method LineBreakEvent (expr parser)
1087   (if (null? (ly:music-property expr 'break-permission))
1088       "\\noBreak"
1089       "\\break"))
1090
1091 (define-display-method PageBreakEvent (expr parser)
1092   (if (null? (ly:music-property expr 'break-permission))
1093       "\\noPageBreak"
1094       "\\pageBreak"))
1095
1096 (define-display-method PageTurnEvent (expr parser)
1097   (if (null? (ly:music-property expr 'break-permission))
1098       "\\noPageTurn"
1099       "\\pageTurn"))
1100
1101 (define-extra-display-method EventChord (expr parser)
1102   (with-music-match (expr (music 'EventChord
1103                             elements ((music 'LineBreakEvent
1104                                              break-permission 'force)
1105                                       (music 'PageBreakEvent
1106                                              break-permission 'force))))
1107     "\\pageBreak"))
1108
1109 (define-extra-display-method EventChord (expr parser)
1110   (with-music-match (expr (music 'EventChord
1111                             elements ((music 'LineBreakEvent
1112                                              break-permission 'force)
1113                                       (music 'PageBreakEvent
1114                                              break-permission 'force)
1115                                       (music 'PageTurnEvent
1116                                              break-permission 'force))))
1117     "\\pageTurn"))
1118
1119 ;;;
1120 ;;; Lyrics
1121 ;;;
1122
1123 ;;; \lyricsto
1124 (define-display-method LyricCombineMusic (expr parser)
1125   (format #f "\\lyricsto ~s ~a"
1126           (ly:music-property expr 'associated-context)
1127           (parameterize ((*explicit-mode* #f))
1128             (music->lily-string (ly:music-property expr 'element) parser))))
1129
1130 ;; \addlyrics
1131 (define-extra-display-method SimultaneousMusic (expr parser)
1132   (with-music-match (expr (music 'SimultaneousMusic
1133                                  elements ((music 'ContextSpeccedMusic
1134                                                   context-id ?id
1135                                                   context-type 'Voice
1136                                                   element ?note-sequence)
1137                                            (music 'ContextSpeccedMusic
1138                                                   context-type 'Lyrics
1139                                                   create-new #t
1140                                                   element (music 'LyricCombineMusic
1141                                                                  associated-context ?associated-id
1142                                                                  element ?lyric-sequence)))))
1143     (if (string=? ?id ?associated-id)
1144         (format #f "~a~a \\addlyrics ~a"
1145                 (music->lily-string ?note-sequence parser)
1146                 (new-line->lily-string)
1147                 (parameterize ((*explicit-mode* #f))
1148                   (music->lily-string ?lyric-sequence parser)))
1149         #f)))
1150
1151