-;;;; define-syntax.scm -- Defines functions for syntax expressions
+;;;; This file is part of LilyPond, the GNU music typesetter.
;;;;
-;;;; source file of the GNU LilyPond music typesetter
-;;;;
-;;;; (c) 2006 Erik Sandberg <mandolaerik@gmail.com>
+;;;; Copyright (C) 2006--2011 Erik Sandberg <mandolaerik@gmail.com>
+;;;;
+;;;; LilyPond is free software: you can redistribute it and/or modify
+;;;; it under the terms of the GNU General Public License as published by
+;;;; the Free Software Foundation, either version 3 of the License, or
+;;;; (at your option) any later version.
+;;;;
+;;;; LilyPond is distributed in the hope that it will be useful,
+;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+;;;; GNU General Public License for more details.
+;;;;
+;;;; You should have received a copy of the GNU General Public License
+;;;; along with LilyPond. If not, see <http://www.gnu.org/licenses/>.
-;; TODO: use separate module for parser.
-(define define-ly-syntax define-public)
+;; TODO: use separate module for syntax
+;; constructors. Also create wrapper around the constructor?
+(defmacro define-ly-syntax (args . body)
+ `(define-public ,args ,(cons 'begin body)))
-;; This shorthand adds a location parameter, and uses it to set the
-;; origin. It can be used for most music functions.
+;; A ly-syntax constructor takes two extra parameters, parser and
+;; location. These are mainly used for reporting errors and
+;; warnings. This function is a syntactic sugar which uses the
+;; location arg to set the origin of the returned music object; this
+;; behaviour is usually desired
(defmacro define-ly-syntax-loc (args . body)
- (primitive-eval `(define-ly-syntax ,(cons* (car args) 'location (cdr args))
- (let ((m ((lambda ,(cdr args) . ,body) . ,(cdr args))))
- (set! (ly:music-property m 'origin) location)
- m))))
+ `(define-public ,args
+ (let ((m ,(cons 'begin body)))
+ (set! (ly:music-property m 'origin) ,(third args))
+ m)))
+;; Like define-ly-syntax-loc, but adds parser and location
+;; parameters. Useful for simple constructors that don't need to
+;; report errors.
+(defmacro define-ly-syntax-simple (args . body)
+ `(define-public ,(cons* (car args)
+ 'parser
+ 'location
+ (cdr args))
+ (let ((m ,(cons 'begin body)))
+ (set! (ly:music-property m 'origin) location)
+ m)))
+
+;; Music function: Apply function and check return value.
+(define-ly-syntax-loc (music-function parser loc fun args)
+ (let ((m (apply fun (cons* parser loc args))))
+ (if (ly:music? m)
+ m
+ (begin
+ (ly:parser-error parser (_ "Music head function must return Music object") loc)
+ (make-music 'Music)))))
-(define-ly-syntax-loc (sequential-music mlist)
+(define-ly-syntax-simple (void-music)
+ (make-music 'Music))
+
+(define-ly-syntax-simple (sequential-music mlist)
(make-sequential-music mlist))
-(define-ly-syntax-loc (simultaneous-music mlist)
+(define-ly-syntax-simple (simultaneous-music mlist)
(make-simultaneous-music mlist))
-(define-ly-syntax-loc (repeat type num body alts)
+(define-ly-syntax-simple (event-chord mlist)
+ (make-music 'EventChord
+ 'elements mlist))
+
+(define-ly-syntax-simple (unrelativable-music mus)
+ (make-music 'UnrelativableMusic
+ 'element mus))
+
+(define-ly-syntax-simple (context-change type id)
+ (make-music 'ContextChange
+ 'change-to-type type
+ 'change-to-id id))
+
+(define-ly-syntax-simple (voice-separator)
+ (make-music 'VoiceSeparator))
+
+(define-ly-syntax-simple (bar-check)
+ (make-music 'BarCheck))
+
+(define-ly-syntax-simple (time-scaled-music fraction music)
+ (make-music 'TimeScaledMusic
+ 'element (ly:music-compress music (ly:make-moment (car fraction) (cdr fraction)))
+ 'numerator (car fraction)
+ 'denominator (cdr fraction)))
+
+(define-ly-syntax-simple (transpose-music pitch music)
+ (make-music 'TransposedMusic
+ 'element (ly:music-transpose music pitch)))
+
+(define-ly-syntax (tempo parser location text . rest)
+ (let* ((unit (and (pair? rest)
+ (car rest)))
+ (count (and unit
+ (cadr rest)))
+ (range-tempo? (pair? count))
+ (tempo-change (make-music 'TempoChangeEvent
+ 'origin location
+ 'text text
+ 'tempo-unit unit
+ 'metronome-count count))
+ (tempo-set
+ (and unit
+ (context-spec-music
+ (make-property-set 'tempoWholesPerMinute
+ (ly:moment-mul
+ (ly:make-moment
+ (if range-tempo?
+ (round (/ (+ (car count) (cdr count))
+ 2))
+ count)
+ 1)
+ (ly:duration-length unit)))
+ 'Score))))
+
+ (if tempo-set
+ (make-sequential-music (list tempo-change tempo-set))
+ tempo-change)))
+
+(define-ly-syntax-simple (skip-music dur)
+ (make-music 'SkipMusic
+ 'duration dur))
+
+(define-ly-syntax-simple (repeat type num body alts)
(make-repeat type num body alts))
+
+(define (script-to-mmrest-text music)
+ "Extract @code{'direction} and @code{'text} from @var{music}, and transform
+into a @code{MultiMeasureTextEvent}."
+
+ (if (memq 'script-event (ly:music-property music 'types))
+ (let* ((location (ly:music-property music 'origin))
+ (dir (ly:music-property music 'direction))
+ (tags (ly:music-property music 'tags))
+ (p (make-music 'MultiMeasureTextEvent
+ 'origin location
+ 'tags tags
+ 'text (ly:music-property music 'text))))
+ (if (ly:dir? dir)
+ (set! (ly:music-property p 'direction) dir))
+ p)
+ music))
+
+(define-ly-syntax (multi-measure-rest parser location duration articulations)
+ (make-music 'MultiMeasureRestMusic
+ 'articulations (map script-to-mmrest-text articulations)
+ 'duration duration
+ 'origin location))
+
+(define-ly-syntax (repetition-chord parser location previous-chord repetition-function duration articulations)
+ (make-music 'RepeatedChord
+ 'original-chord previous-chord
+ 'element (repetition-function previous-chord location duration articulations)
+ 'origin location))
+
+(define-ly-syntax-simple (context-specification type id mus ops create-new)
+ (let* ((type-sym (if (symbol? type) type (string->symbol type)))
+ (csm (context-spec-music mus type-sym id)))
+ (set! (ly:music-property csm 'property-operations) ops)
+ (if create-new (set! (ly:music-property csm 'create-new) #t))
+ csm))
+
+(define-ly-syntax (property-operation parser location once ctx music-type symbol . args)
+ (let* ((props (case music-type
+ ((PropertySet) (list 'value (car args)))
+ ((PropertyUnset) '())
+ ((OverrideProperty) (list 'grob-value (car args)
+ 'grob-property-path (if (list? (cadr args))
+ (cadr args)
+ (cdr args))
+ 'pop-first #t))
+ ((RevertProperty)
+ (if (list? (car args))
+ (list 'grob-property-path (car args))
+ (list 'grob-property-path args)))
+ (else (ly:error (_ "Invalid property operation ~a") music-type))))
+ (oprops (if once (cons* 'once once props) props))
+ (m (apply make-music music-type
+ 'symbol symbol
+ 'origin location
+ oprops)))
+ (make-music 'ContextSpeccedMusic
+ 'element m
+ 'context-type ctx
+ 'origin location)))
+
+;; TODO: It seems that this function rarely returns anything useful.
+(define (get-first-context-id type mus)
+ "Find the name of a ContextSpeccedMusic with given type"
+ (let ((id (ly:music-property mus 'context-id)))
+ (if (and (eq? (ly:music-property mus 'type) 'ContextSpeccedMusic)
+ (eq? (ly:music-property mus 'context-type) type)
+ (string? id)
+ (not (string-null? id)))
+ id
+ '())))
+
+(define unique-counter -1)
+(define (get-next-unique-voice-name)
+ (set! unique-counter (1+ unique-counter))
+ (call-with-output-string (lambda (p) (format p "uniqueContext~s" unique-counter))))
+
+(define (lyric-combine-music sync music loc)
+ ;; CompletizeExtenderEvent is added following the last lyric in MUSIC
+ ;; to signal to the Extender_engraver that any pending extender should
+ ;; be completed if the lyrics end before the associated voice.
+ (append! (ly:music-property music 'elements)
+ (list (make-music 'CompletizeExtenderEvent)))
+ (make-music 'LyricCombineMusic
+ 'element music
+ 'associated-context sync
+ 'origin loc))
+
+(define-ly-syntax (lyric-combine parser location voice music)
+ (lyric-combine-music voice music location))
+
+(define-ly-syntax (add-lyrics parser location music addlyrics-list)
+ (let* ((existing-voice-name (get-first-context-id 'Voice music))
+ (voice-name (if (string? existing-voice-name)
+ existing-voice-name
+ (get-next-unique-voice-name)))
+ (voice (if (string? existing-voice-name)
+ (music)
+ (make-music 'ContextSpeccedMusic
+ 'element music
+ 'context-type 'Voice
+ 'context-id voice-name
+ 'origin (ly:music-property music 'origin))))
+ (lyricstos (map (lambda (mus)
+ (let* ((loc (ly:music-property mus 'origin))
+ (lyr (lyric-combine-music voice-name mus loc)))
+ (make-music 'ContextSpeccedMusic
+ 'create-new #t
+ 'context-type 'Lyrics
+ 'element lyr
+ 'origin loc)))
+ addlyrics-list)))
+ (make-simultaneous-music (cons voice lyricstos))))
+
+(define-ly-syntax (make-mark-set parser location label)
+ "Make the music for the \\mark command."
+ (let* ((set (and (integer? label)
+ (context-spec-music (make-property-set 'rehearsalMark label)
+ 'Score)))
+ (ev (make-music 'MarkEvent))
+ (ch (make-event-chord (list ev))))
+
+ (set! (ly:music-property ev 'origin) location)
+ (if set
+ (make-sequential-music (list set ch))
+ (begin
+ (set! (ly:music-property ev 'label) label)
+ ch))))
+
+(define-ly-syntax (partial parser location dur)
+ "Make a partial measure."
+
+ ;; We use `descend-to-context' here instead of `context-spec-music' to
+ ;; ensure \partial still works if the Timing_translator is moved
+ (descend-to-context
+ (context-spec-music (make-music 'PartialSet
+ 'origin location
+ 'partial-duration dur)
+ 'Timing)
+ 'Score))
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