2 (define (engraver-description name description created-elts properties)
3 (list name description created-elts properties)
7 (define engraver-description-alist
13 "Create stems and single-stem tremolos. It also works together with
14 the beam engraver for overriding beaming."
25 "Create lyric hyphens"
34 "Create lyric extenders"
41 'Separating_line_group_engraver
43 "Separating_line_group_engraver"
44 "Generates objects for computing spacing parameters."
45 '(SeparationItem SeparatingGroupSpanner)
53 "Group all objects created in this context in a VerticalAxisGroup spanner."
55 '(CONTEXTNAMEVerticalExtent CONTEXTNAMEMinimumVerticalExtent CONTEXTNAMExtraVerticalExtent)
62 "Like Axis_group_engraver, but make a hara kiri spanner, and add
63 interesting items (ie. note heads, lyric syllables and normal rests)"
64 '(HaraKiriVerticalGroup)
73 "Make accidentals. Catches note heads, ties and notices key-change
74 events. Due to interaction with ties (which don't come together
75 with note heads), this needs to be in a context higher than Tie_engraver.
92 '(repeatCommands voltaSpannerDuration)
99 "Determine and set reference point for pitches"
100 '(Clef OctavateEight)
106 explicitClefVisibility
113 (engraver-description
115 "Part combine engraver for orchestral scores."
131 'Align_note_column_engraver
132 (engraver-description
133 "Align_note_column_engraver"
134 "Generate object to put grace notes from left to right."
144 (engraver-description
146 "Generate an Arpeggio from a Arpeggio_req"
153 (engraver-description
155 "Generate beams based on measure characteristics and observed
156 Stems. Uses beatLength, measureLength and measurePosition to decide
157 when to start and stop a beam. Overriding beaming is done through
158 @ref{Stem_engraver} properties stemLeftBeamCount and
169 (engraver-description
171 "Create barlines. This engraver is controlled through the
172 @code{whichBar} property. If it has no bar line to create, it will forbid a linebreak at this point"
182 (engraver-description
183 "Bar_number_engraver"
184 "A bar number is created whenever measurePosition is zero. It is
185 put on top of all staffs, and appears only at left side of the staff."
194 (engraver-description
196 "Handles Beam_requests by engraving Beams. If omitted, then notes will be
197 printed with flags instead of beams."
204 'Break_align_engraver
205 (engraver-description
206 "Break_align_engraver"
207 "Align grobs with corresponding break-align-symbols into groups, and order the groups according to breakAlignOrder"
208 '(BreakAlignment BreakAlignGroup LeftEdge)
216 'Breathing_sign_engraver
217 (engraver-description
218 "Breathing_sign_engraver"
227 (engraver-description
228 "Chord_name_engraver"
229 "Catch Note_req's, Tonic_reqs, Inversion_reqs, Bass_req
230 and generate the appropriate chordname."
238 'Chord_tremolo_engraver
239 (engraver-description
240 "Chord_tremolo_engraver"
241 "Generates beams for the \repeat X tremolo ... construct"
250 (engraver-description
260 (engraver-description
270 (engraver-description
271 "Dot_column_engraver"
272 " Engraves dots on dotted notes shifted to the right of the note.
273 If omitted, then dots appear on top of the notes.
283 (engraver-description
296 'Grace_position_engraver
297 (engraver-description
298 "Grace_position_engraver"
299 "Attach a grace note alignment to a note-column "
305 'Grace_engraver_group
306 (engraver-description
307 "Grace_engraver_group"
308 "An engraver that creates a `shielded' context-tree with separate notion of time"
315 'Instrument_name_engraver
316 (engraver-description
317 "Instrument_name_engraver"
318 " Prints the name of the instrument (specified by
319 @code{Staff.instrument} and @code{Staff.instr}) at the left of the
328 'Engraver_group_engraver
329 (engraver-description
330 "Engraver_group_engraver"
331 "A group of engravers taken together"
338 (engraver-description
347 explicitKeySignatureVisibility
348 createKeyOnClefChange
353 (cons 'Lyric_engraver
354 (engraver-description
362 (cons 'Lyric_phrasing_engraver
363 (engraver-description
364 "Lyric_phrasing_engraver"
377 (engraver-description
390 (engraver-description
404 'Multi_measure_rest_engraver
405 (engraver-description
406 "Multi_measure_rest_engraver"
407 "Engraves multi-measure rests that are produced with @code{R}. Reads
408 measurePosition and currentBarNumber to determine what number to print over the MultiMeasureRest
416 (engraver-description
417 "Note_heads_engraver"
418 "Generate one or more noteheads from Music of type Note_req."
424 'Note_head_line_engraver
425 (engraver-description
426 "Note_head_line_engraver"
427 "Engrave a line between two note heads, for example a glissando.
428 If followThread is set, staff switches also generate a line."
434 (engraver-description
443 'Output_property_engraver
444 (engraver-description
445 "Output_property_engraver"
446 "Interpret Music of Output_property type, and apply a function
447 to any Graphic objects that satisfies the predicate."
454 'Piano_pedal_engraver
455 (engraver-description
456 "Piano_pedal_engraver"
457 "Engrave piano pedal symbols."
458 '(SostenutoPedal SustainPedal UnaChordaPedal)
459 '(pedalSostenutoStrings pedalSustainStrings pedalUnaChordaStrings
463 'Pitch_squash_engraver
464 (engraver-description
465 "Pitch_squash_engraver"
466 "Treat all pitches as middle C. Note that the notes move, but
467 the locations of accidentals stay the same.
468 Set the position field of all note heads to zero. This useful for
469 making a single line staff that demonstrates the rhythm of a melody."
477 (engraver-description
479 "This is a engraver that converts \property settings into
480 back-end grob-property settings. Example: Voice.stemLength will set
481 #'length in all Stem objects.
483 Due to CPU and memory requirements, the use of this engraver is deprecated."
485 '(Generic_property_list)
490 'Repeat_acknowledge_engraver
491 (engraver-description
492 "Repeat_acknowledge_engraver"
494 "Acknowledge repeated music, and convert the contents of
495 repeatCommands ainto an appropriate setting for whichBar"
505 'Rest_collision_engraver
506 (engraver-description
507 "Rest_collision_engraver"
508 "Handles collisions of rests."
516 (engraver-description
525 'Rhythmic_column_engraver
526 (engraver-description
527 "Rhythmic_column_engraver"
528 "Generates NoteColumn, an objects that groups stems, noteheads and rests."
535 'Script_column_engraver
536 (engraver-description
537 "Script_column_engraver"
546 (engraver-description
548 " Handles note ornaments generated by @code{\script}.
558 (engraver-description
560 "Top level engraver. Takes care of generating columns and the complete system (ie. LineOfScore)
562 This engraver decides whether a column is breakable. The default is
563 that a column is always breakable. However, when every Bar_engraver
564 that does not have a barline at a certain point will call
565 Score_engraver::forbid_breaks to stop linebreaks. In practice, this
566 means that you can make a breakpoint by creating a barline (assuming
567 that there are no beams or notes that prevent a breakpoint.)
570 '(LineOfScore PaperColumn NonMusicalPaperColumn)
576 (cons 'Skip_req_swallow_translator
577 (engraver-description
578 "Skip_req_swallow_translator"
587 (engraver-description
589 "Build slurs from Slur_reqs"
601 (engraver-description
603 "make a SpacingSpanner and do bookkeeping of shortest starting and playing notes "
610 'Span_arpeggio_engraver
611 (engraver-description
612 "Span_arpeggio_engraver"
622 (engraver-description
624 "This engraver makes cross-staff barlines: It catches all normal
625 bar lines, and draws a single span-bar across them."
633 'Staff_symbol_engraver
634 (engraver-description
635 "Staff_symbol_engraver"
636 "create the constellation of five (default) staff lines."
643 'Stanza_number_engraver
644 (engraver-description
645 "Stanza_number_engraver"
657 'System_start_delimiter_engraver
658 (engraver-description
659 "System_start_delimiter_engraver"
660 "creates a SystemStartDelimiter spanner"
661 '(SystemStartDelimiter)
668 (engraver-description
670 "Create text-scripts"
679 'Text_spanner_engraver
680 (engraver-description
681 "Text_spanner_engraver"
682 "Create text spanner from a Span_req "
689 'Thread_devnull_engraver
690 (engraver-description
691 "Thread_devnull_engraver"
692 "Kill elements whenever we are Voice called `two' and
693 either unison, unisilence or soloADue is set"
700 (engraver-description
702 "Generate ties between noteheads of equal pitch."
710 'Time_signature_engraver
711 (engraver-description
712 "Time_signature_engraver"
713 "Create a TimeSignature whenever @code{timeSignatureFraction} changes"
721 (engraver-description
723 " Responsible for synchronizing timing information from staffs.
724 Normally in @code{Score}. In order to create polyrhythmic music,
725 this engraver should be removed from @code{Score} and placed in
729 timeSignatureFraction
730 barCheckNoSynchronize
746 (engraver-description
748 "Catch Time_scaled_music and generate appropriate bracket "
752 tupletSpannerDuration
758 'Vertical_align_engraver
759 (engraver-description
760 "Vertical_align_engraver"
761 "Catch Vertical axis groups and stack them."
768 'Voice_devnull_engraver
769 (engraver-description
770 "Voice_devnull_engraver"
771 "Kill off certain items and spanners if we're Voice `two' and unison or unisilence is set."
778 (set! engraver-description-alist
779 (sort engraver-description-alist alist<?))
781 (define context-description-alist
784 The context for handling grace notes. It is instantiated
785 automatically when you use @code{\grace}. Basically, it is an
786 `embedded' miniature of the Score context. Since this context
787 needs special interaction with the rest of LilyPond, you should
788 not explicitly instantiate it.
791 Corresponds to a voice with lyrics. Handles the printing of a
792 single line of lyrics.
795 Handles note heads, and is contained in the Voice context. You
796 have to instantiate this explicitly if you want to adjust the
797 style of individual note heads.
800 Corresponds to a voice on a staff. This context handles the
801 conversion of dynamic signs, stems, beams, super- and subscripts,
802 slurs, ties, and rests.
804 You have to instantiate this explicitly if you want to have
805 multiple voices on the same staff.")
808 A voice with chord names. Handles printing of a line of chord
812 Typesets chord names. Can contain @code{ChordNamesVoice}
816 Typesets lyrics. It can contain @code{LyricsVoice} contexts.
819 Handles clefs, bar lines, keys, accidentals. It can contain
820 @code{Voice} contexts.
823 A context like @code{Staff} but for printing rhythms. Pitches are
824 ignored; the notes are printed on one line. It can contain
825 @code{Voice} contexts.
828 Contains @code{Staff} or @code{RhythmicStaff} contexts. It adds a
829 brace on the left side, grouping the staffs together. The bar
830 lines of the contained staffs are connected vertically. It can
831 contain @code{Staff} contexts.")
834 Just like @code{GrandStaff} but with @code{minVerticalAlign} set
835 equal to @code{maxVerticalAlign} so that interstaff beaming and
836 slurring can be used.")
839 Contains @code{Staff} or @code{RhythmicStaff} contexts. Adds a
840 bracket on the left side, grouping the staffs together. The bar
841 lines of the contained staffs are connected vertically. It can
842 contain @code{Staff}, @code{RhythmicStaff}, @code{GrandStaff}, or
843 @code{Lyrics} contexts.
846 Identical to @code{StaffGroup} except that the contained staffs
847 are not connected vertically.
850 This is the top level notation context. No other context can
851 contain a @code{Score} context. This context handles the
852 administration of time signatures. It also makes sure that items
853 such as clefs, time signatures, and key-signatures are aligned
854 across staffs. It can contain @code{Lyrics}, @code{Staff},
855 @code{RhythmicStaff}, @code{GrandStaff}, @code{StaffGroup}, and
856 @code{ChoirStaff} contexts.
858 You cannot explicitly instantiate a Score context (since it is
859 not contained in any other context). It is instantiated
860 automatically when an output definition (a @code{\score} or
861 @code{\paper} block) is processed.
866 (set! context-description-alist
867 (sort context-description-alist alist<?))