LilyPond Internals Reference: 3.4 Internal backend properties

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3.4 Internal backend properties

accidental-grob (graphical (layout) object): The accidental for this note.
accidental-grobs (list): An alist with (notename . groblist) entries.
add-cauda (boolean): Does this flexa require an additional cauda on the left side?
add-join (boolean): Is this ligature head-joined with the next one by a vertical line?
add-stem (boolean): Is this ligature head a virga and therefore needs an additional stem on the right side?
adjacent-pure-heights (pair): A pair of vectors. Used by a VerticalAxisGroup to cache the Y-extents of different column ranges.
adjacent-spanners (array of grobs): An array of directly neighboring dynamic spanners.
all-elements (array of grobs): An array of all grobs in this line. Its function is to protect objects from being garbage collected.
arpeggio (graphical (layout) object): A pointer to an Arpeggio object.
ascendens (boolean): Is this neume of ascending type?
auctum (boolean): Is this neume liquescentically augmented?
axis-group-parent-X (graphical (layout) object): Containing X axis group.
axis-group-parent-Y (graphical (layout) object): Containing Y axis group.
bars (array of grobs): An array of bar line pointers.
beam (graphical (layout) object): A pointer to the beam, if applicable.
beam-segments (list): Internal representation of beam segments.
begin-of-line-visible (boolean): Set to make ChordName or FretBoard be visible only at beginning of line or at chord changes.
bound-alignment-interfaces (list): Interfaces to be used for positioning elements that align with a column.
bounded-by-me (array of grobs): An array of spanners that have this column as start/begin point. Only columns that have grobs or act as bounds are spaced.
bracket (graphical (layout) object): The bracket for a number.
cause (any type): Any kind of causation objects (i.e., music, or perhaps translator) that was the cause for this grob.
cavum (boolean): Is this neume outlined?
columns (array of grobs): An array of grobs, typically containing PaperColumn or NoteColumn objects.
concurrent-hairpins (array of grobs): All concurrent hairpins.
conditional-elements (array of grobs): Internal use only.
context-info (integer): Within a ligature, the final glyph or shape of a head may be affected by the left and/or right neighbour head. context-info holds for each head such information about the left and right neighbour, encoded as a bit mask.
covered-grobs (array of grobs): Grobs that could potentially collide with a beam.
cross-staff (boolean): For a beam or a stem, this is true if we depend on inter-staff spacing.
delta-position (number): The vertical position difference.
deminutum (boolean): Is this neume deminished?
descendens (boolean): Is this neume of descendent type?
direction-source (graphical (layout) object): In case side-relative-direction is set, which grob to get the direction from.
display-cautionary (boolean): Should the grob be displayed as a cautionary grob?
dot (graphical (layout) object): A reference to a Dots object.
dots (array of grobs): Multiple Dots objects.
elements (array of grobs): An array of grobs; the type is depending on the grob where this is set in.
encompass-objects (array of grobs): Objects that a slur should avoid in addition to notes and stems.
figures (array of grobs): Figured bass objects for continuation line.
flag (graphical (layout) object): A pointer to a Flag object.
flexa-height (dimension, in staff space): The height of a flexa shape in a ligature grob (in staff-space units).
flexa-interval (integer): The interval spanned by the two notes of a flexa shape (1 is a second, 7 is an octave).
flexa-width (dimension, in staff space): The width of a flexa shape in a ligature grob in (in staff-space units).
font (font metric): A cached font metric object.
footnote-stencil (stencil): The stencil of a system’s footnotes.
footnotes-after-line-breaking (array of grobs): Footnote grobs of a broken system.
footnotes-before-line-breaking (array of grobs): Footnote grobs of a whole system.
forced (boolean): Manually forced accidental.
full-score-pure-minimum-translations (list): A list of translations for a full score’s worth of grobs.
glissando-index (integer): The index of a glissando in its note column.
grace-spacing (graphical (layout) object): A run of grace notes.
has-span-bar (pair): A pair of grobs containing the span bars to be drawn below and above the staff. If no span bar is in a position, the respective element is set to #f.
head-width (dimension, in staff space): The width of this ligature head.
heads (array of grobs): An array of note heads.
ideal-distances (list): (obj . (dist . strength)) pairs.
important-column-ranks (vector): A cache of columns that contain items-worth-living data.
in-note-direction (direction): Direction to place in-notes above a system.
in-note-padding (number): Padding between in-notes.
in-note-stencil (stencil): The stencil of a system’s in-notes.
inclinatum (boolean): Is this neume an inclinatum?
interfaces (list): A list of symbols indicating the interfaces supported by this object. It is initialized from the meta field.
items-worth-living (array of grobs): An array of interesting items. If empty in a particular staff, then that staff is erased.
keep-alive-with (array of grobs): An array of other VerticalAxisGroups. If any of them are alive, then we will stay alive.
least-squares-dy (number): The ideal beam slope, without damping.
left-items (array of grobs): DOCME
left-neighbor (graphical (layout) object): The right-most column that has a spacing-wish for this column.
ligature-flexa (boolean): request joining note to the previous one in a flexa.
linea (boolean): Attach vertical lines to this neume?
maybe-loose (boolean): Used to mark a breakable column that is loose if and only if it is in the middle of a line.
melody-spanner (graphical (layout) object): The MelodyItem object for a stem.
meta (list): Provide meta information. It is an alist with the entries name and interfaces.
minimum-distances (list): A list of rods that have the format (obj . dist).
neighbors (array of grobs): The X-axis neighbors of a grob. Used by the pure-from-neighbor-interface to determine various grob heights.
normal-stems (array of grobs): An array of visible stems.
note-collision (graphical (layout) object): The NoteCollision object of a dot column.
note-columns (array of grobs): An array of NoteColumn grobs.
note-head (graphical (layout) object): A single note head.
note-heads (array of grobs): An array of note head grobs.
numbering-assertion-function (any type): The function used to assert that footnotes are receiving correct automatic numbers.
oriscus (boolean): Is this neume an oriscus?
pedal-text (graphical (layout) object): A pointer to the text of a mixed-style piano pedal.
pes-or-flexa (boolean): Shall this neume be joined with the previous head?
positioning-done (boolean): Used to signal that a positioning element did its job. This ensures that a positioning is only done once.
potential-X-colliding-grobs (array of grobs): Grobs that can potentially collide with a self-aligned grob on the X-axis.
prefix-set (number): A bit mask that holds all Gregorian head prefixes, such as \virga or \quilisma.
primitive (integer): A pointer to a ligature primitive, i.e., an item similar to a note head that is part of a ligature.
pure-relevant-grobs (array of grobs): All the grobs (items and spanners) that are relevant for finding the pure-Y-extent
pure-relevant-items (array of grobs): A subset of elements that are relevant for finding the pure-Y-extent.
pure-relevant-spanners (array of grobs): A subset of elements that are relevant for finding the pure-Y-extent.
pure-Y-common (graphical (layout) object): A cache of the common_refpoint_of_array of the elements grob set.
pure-Y-extent (pair of numbers): The estimated height of a system.
pure-Y-offset-in-progress (boolean): A debugging aid for catching cyclic dependencies.
quantize-position (boolean): If set, a vertical alignment is aligned to be within staff spaces.
quantized-positions (pair of numbers): The beam positions after quanting.
quilisma (boolean): Is this neume a quilisma?
rest (graphical (layout) object): A pointer to a Rest object.
rest-collision (graphical (layout) object): A rest collision that a rest is in.
rests (array of grobs): An array of rest objects.
right-items (array of grobs): DOCME
right-neighbor (graphical (layout) object): See left-neighbor.
script-stencil (pair): A pair (type . arg) which acts as an index for looking up a Stencil object.
shorten (dimension, in staff space): The amount of space that a stem is shortened. Internally used to distribute beam shortening over stems.
side-support-elements (array of grobs): The side support, an array of grobs.
skyline-quantizing (non-negative integer): The number of boxes to break a slur into when calculating its skyline.
slur (graphical (layout) object): A pointer to a Slur object.
spacing (graphical (layout) object): The spacing spanner governing this section.
spacing-wishes (array of grobs): An array of note spacing or staff spacing objects.
span-start (boolean): Is the note head at the start of a spanner?
spanner-broken (boolean): Indicates whether spanner alignment should be broken after the current spanner.
spanner-placement (direction): The place of an annotation on a spanner. LEFT is for the first spanner, and RIGHT is for the last. CENTER will place it on the broken spanner that falls closest to the center of the length of the entire spanner, although this behavior is unpredictable in situations with lots of rhythmic diversity. For predictable results, use LEFT and RIGHT.
staff-grouper (graphical (layout) object): The staff grouper we belong to.
staff-symbol (graphical (layout) object): The staff symbol grob that we are in.
stem (graphical (layout) object): A pointer to a Stem object.
stem-info (pair): A cache of stem parameters.
stems (array of grobs): An array of stem objects.
stropha (boolean): Is this neume a stropha?
system-Y-offset (number): The Y-offset (relative to the bottom of the top-margin of the page) of the system to which this staff belongs.
tie (graphical (layout) object): A pointer to a Tie object.
ties (array of grobs): A grob array of Tie objects.
tremolo-flag (graphical (layout) object): The tremolo object on a stem.
tuplet-number (graphical (layout) object): The number for a bracket.
tuplet-start (boolean): Is stem at the start of a tuplet?
tuplets (array of grobs): An array of smaller tuplet brackets.
virga (boolean): Is this neume a virga?
X-colliding-grobs (array of grobs): Grobs that can collide with a self-aligned grob on the X-axis.
X-common (graphical (layout) object): Common reference point for axis group.
x-offset (dimension, in staff space): Extra horizontal offset for ligature heads.
Y-colliding-grobs (array of grobs): Grobs that can collide with a self-aligned grob on the Y-axis.
Y-common (graphical (layout) object): See X-common.

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