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 graphic elements 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."
239 'Chord_tremolo_engraver
240 (engraver-description
241 "Chord_tremolo_engraver"
242 "Generates beams for the \repeat X tremolo ... construct"
251 (engraver-description
261 (engraver-description
271 (engraver-description
272 "Dot_column_engraver"
273 " Engraves dots on dotted notes shifted to the right of the note.
274 If omitted, then dots appear on top of the notes.
284 (engraver-description
288 DynamicText Crescendo
297 'Grace_position_engraver
298 (engraver-description
299 "Grace_position_engraver"
300 "Attach a grace note alignment to a note-column "
306 'Grace_engraver_group
307 (engraver-description
308 "Grace_engraver_group"
309 "An engraver that creates a `shielded' context-tree with separate notion of time"
316 'Instrument_name_engraver
317 (engraver-description
318 "Instrument_name_engraver"
319 " Prints the name of the instrument (specified by
320 @code{Staff.instrument} and @code{Staff.instr}) at the left of the
329 'Engraver_group_engraver
330 (engraver-description
331 "Engraver_group_engraver"
332 "A group of engravers taken together"
339 (engraver-description
348 explicitKeySignatureVisibility
349 createKeyOnClefChange
354 (cons 'Lyric_engraver
355 (engraver-description
363 (cons 'Lyric_phrasing_engraver
364 (engraver-description
365 "Lyric_phrasing_engraver"
378 (engraver-description
391 (engraver-description
405 'Multi_measure_rest_engraver
406 (engraver-description
407 "Multi_measure_rest_engraver"
408 "Engraves multi-measure rests that are produced with @code{R}. Reads
409 measurePosition and currentBarNumber to determine what number to print over the MultiMeasureRest
417 (engraver-description
418 "Note_heads_engraver"
419 "Generate one or more noteheads from Music of type Note_req."
425 'Note_head_line_engraver
426 (engraver-description
427 "Note_head_line_engraver"
428 "Engrave a line between two note heads."
429 '(Glissando FollowThread)
435 (engraver-description
444 'Output_property_engraver
445 (engraver-description
446 "Output_property_engraver"
447 "Interpret Music of Output_property type, and apply a function
448 to any Graphic objects that satisfies the predicate."
455 'Piano_pedal_engraver
456 (engraver-description
457 "Piano_pedal_engraver"
458 "engrave Piano pedals symbols."
459 '(SostenutoPedal SustainPedal UnaChordaPedal)
470 'Pitch_squash_engraver
471 (engraver-description
472 "Pitch_squash_engraver"
473 "Treat all pitches as middle C. Note that the notes move, but
474 the locations of accidentals stay the same.
475 Set the position field of all note heads to zero. This useful for
476 making a single line staff that demonstrates the rhythm of a melody."
484 (engraver-description
486 "This is a engraver that converts \property settings into
487 back-end element-property settings. Example: Voice.stemLength will set
488 #'length in all Stem objects.
490 Due to CPU and memory requirements, the use of this engraver is deprecated."
492 '(Generic_property_list)
497 'Repeat_acknowledge_engraver
498 (engraver-description
499 "Repeat_acknowledge_engraver"
501 "Acknowledge repeated music, and convert the contents of
502 repeatCommands ainto an appropriate setting for whichBar"
512 'Rest_collision_engraver
513 (engraver-description
514 "Rest_collision_engraver"
515 "Handles collisions of rests."
523 (engraver-description
532 'Rhythmic_column_engraver
533 (engraver-description
534 "Rhythmic_column_engraver"
535 "Generates NoteColumn, an objects that groups stems, noteheads and rests."
542 'Script_column_engraver
543 (engraver-description
544 "Script_column_engraver"
553 (engraver-description
555 " Handles note ornaments generated by @code{\script}.
565 (engraver-description
567 "Top level engraver. Takes care of generating columns and the complete system (ie. LineOfScore)
569 This engraver decides whether a column is breakable. The default is
570 that a column is always breakable. However, when every Bar_engraver
571 that does not have a barline at a certain point will call
572 Score_engraver::forbid_breaks to stop linebreaks. In practice, this
573 means that you can make a breakpoint by creating a barline (assuming
574 that there are no beams or notes that prevent a breakpoint.)
577 '(LineOfScore PaperColumn NonMusicalPaperColumn)
583 (cons 'Skip_req_swallow_translator
584 (engraver-description
585 "Skip_req_swallow_translator"
594 (engraver-description
596 "Build slurs from Slur_reqs"
608 (engraver-description
610 "make a SpacingSpanner and do bookkeeping of shortest starting and playing notes "
617 'Span_arpeggio_engraver
618 (engraver-description
619 "Span_arpeggio_engraver"
629 (engraver-description
631 "This engraver makes cross-staff barlines: It catches all normal
632 bar lines, and draws a single span-bar across them."
640 'Staff_symbol_engraver
641 (engraver-description
642 "Staff_symbol_engraver"
643 "create the constellation of five (default) staff lines."
650 'Stanza_number_engraver
651 (engraver-description
652 "Stanza_number_engraver"
664 'System_start_delimiter_engraver
665 (engraver-description
666 "System_start_delimiter_engraver"
667 "creates a SystemStartDelimiter spanner"
668 '(SystemStartDelimiter)
675 (engraver-description
677 "Create text-scripts"
686 'Text_spanner_engraver
687 (engraver-description
688 "Text_spanner_engraver"
689 "Create text spanner from a Span_req "
696 'Thread_devnull_engraver
697 (engraver-description
698 "Thread_devnull_engraver"
699 "Kill elements whenever we are Voice called `two' and
700 either unison, unisilence or soloADue is set"
707 (engraver-description
709 "Generate ties between noteheads of equal pitch."
717 'Time_signature_engraver
718 (engraver-description
719 "Time_signature_engraver"
720 "Create a TimeSignature whenever @code{timeSignatureFraction} changes"
728 (engraver-description
730 " Responsible for synchronizing timing information from staffs.
731 Normally in @code{Score}. In order to create polyrhythmic music,
732 this engraver should be removed from @code{Score} and placed in
736 timeSignatureFraction
737 barCheckNoSynchronize
753 (engraver-description
755 "Catch Time_scaled_music and generate appropriate bracket "
759 tupletSpannerDuration
765 'Vertical_align_engraver
766 (engraver-description
767 "Vertical_align_engraver"
768 "Catch Vertical axis groups and stack them."
775 'Voice_devnull_engraver
776 (engraver-description
777 "Voice_devnull_engraver"
778 "Kill off certain items and spanners if we're Voice `two' and unison or unisilence is set."
785 (set! engraver-description-alist
786 (sort engraver-description-alist alist<?))
788 (define context-description-alist
791 The context for handling grace notes. It is instantiated
792 automatically when you use @code{\grace}. Basically, it is an
793 `embedded' miniature of the Score context. Since this context
794 needs special interaction with the rest of LilyPond, you should
795 not explicitly instantiate it.
798 Corresponds to a voice with lyrics. Handles the printing of a
799 single line of lyrics.
802 Handles note heads, and is contained in the Voice context. You
803 have to instantiate this explicitly if you want to adjust the
804 style of individual note heads.
807 Corresponds to a voice on a staff. This context handles the
808 conversion of dynamic signs, stems, beams, super- and subscripts,
809 slurs, ties, and rests.
811 You have to instantiate this explicitly if you want to have
812 multiple voices on the same staff.")
815 A voice with chord names. Handles printing of a line of chord
819 Typesets chord names. Can contain @code{ChordNamesVoice}
823 Typesets lyrics. It can contain @code{LyricsVoice} contexts.
826 Handles clefs, bar lines, keys, accidentals. It can contain
827 @code{Voice} contexts.
830 A context like @code{Staff} but for printing rhythms. Pitches are
831 ignored; the notes are printed on one line. It can contain
832 @code{Voice} contexts.
835 Contains @code{Staff} or @code{RhythmicStaff} contexts. It adds a
836 brace on the left side, grouping the staffs together. The bar
837 lines of the contained staffs are connected vertically. It can
838 contain @code{Staff} contexts.")
841 Just like @code{GrandStaff} but with @code{minVerticalAlign} set
842 equal to @code{maxVerticalAlign} so that interstaff beaming and
843 slurring can be used.")
846 Contains @code{Staff} or @code{RhythmicStaff} contexts. Adds a
847 bracket on the left side, grouping the staffs together. The bar
848 lines of the contained staffs are connected vertically. It can
849 contain @code{Staff}, @code{RhythmicStaff}, @code{GrandStaff}, or
850 @code{Lyrics} contexts.
853 Identical to @code{StaffGroup} except that the contained staffs
854 are not connected vertically.
857 This is the top level notation context. No other context can
858 contain a @code{Score} context. This context handles the
859 administration of time signatures. It also makes sure that items
860 such as clefs, time signatures, and key-signatures are aligned
861 across staffs. It can contain @code{Lyrics}, @code{Staff},
862 @code{RhythmicStaff}, @code{GrandStaff}, @code{StaffGroup}, and
863 @code{ChoirStaff} contexts.
865 You cannot explicitly instantiate a Score context (since it is
866 not contained in any other context). It is instantiated
867 automatically when an output definition (a @code{\score} or
868 @code{\paper} block) is processed.
873 (set! context-description-alist
874 (sort context-description-alist alist<?))