1 ;;;; grob-description.scm -- part of generated backend documentation
3 ;;;; source file of the GNU LilyPond music typesetter
5 ;;;; (c) 1998--20.301 Han-Wen Nienhuys <hanwen@cs.uu.nl>
6 ;;;; Jan Nieuwenhuizen <janneke@gnu.org>
8 ; distances are given in stafflinethickness (thicknesses) and
9 ; staffspace (distances)
11 (define default-alteration-alist
13 (0 . ((raise . 0.5) (music "accidentals-0")))
14 (-1 . ((raise . 0.5) (music "accidentals--1")))
15 (-2 . ((raise . 0.5) (music "accidentals--2")))
16 (1 . ((raise . 0.5) (music "accidentals-1")))
17 (2 . ((raise . 0.5) (music "accidentals-2")))
21 ;;; WARNING: the meta field should be the last one.
23 ;; TODO: junk the meta field in favor of something more compact?
24 (define all-grob-descriptions
27 (molecule-callback . ,Local_key_item::brew_molecule)
28 (X-offset-callbacks . (,Side_position_interface::aligned_side))
29 (after-line-breaking-callback . ,Local_key_item::after_line_breaking)
33 (paren-cautionaries . #t)
35 (meta . ,(grob-description accidentals-interface font-interface side-position-interface))
39 (X-extent-callback . ,Arpeggio::width_callback)
40 (Y-extent-callback . #f)
41 (molecule-callback . ,Arpeggio::brew_molecule)
42 (Y-offset-callbacks . (,Staff_symbol_referencer::callback))
43 (X-offset-callbacks . (,Side_position_interface::aligned_side))
45 (staff-position . 0.0)
46 (meta . ,(grob-description arpeggio-interface side-position-interface font-interface))
50 (break-align-symbol . Staff_bar)
52 (break-glyph-function . ,default-break-barline)
53 (bar-size-procedure . ,Bar::get_staff_bar_size)
54 (molecule-callback . ,Bar::brew_molecule)
55 (visibility-lambda . ,all-visible)
57 (before-line-breaking-callback . ,Bar::before_line_breaking)
59 ;; Ross. page 151 lists other values, we opt for a leaner look
63 (hair-thickness . 1.6)
64 (thick-thickness . 6.0)
65 (meta . ,(grob-description bar-line-interface font-interface))
69 (molecule-callback . ,Text_item::brew_molecule)
71 (visibility-lambda . ,begin-of-line-visible)
75 (font-relative-size . -1)
76 (Y-offset-callbacks . (,Side_position_interface::aligned_side))
77 (meta . ,(grob-description
78 side-position-interface
79 text-interface font-interface break-aligned-interface))
83 (molecule-callback . ,Text_item::brew_molecule)
84 (Y-offset-callbacks . (,Side_position_interface::aligned_on_self))
86 (accidental-alist . ,default-alteration-alist)
87 (font-family . number)
88 (font-relative-size . -1)
89 (meta . ,(grob-description text-interface font-interface ))
92 ;; todo: clean this up a bit: the list is getting
94 (molecule-callback . ,Beam::brew_molecule)
95 (y-dy-callbacks . (,Beam::least_squares
96 ,Beam::cancel_suspect_slope
100 ,Beam::do_quantise_y))
102 (thickness . 0.48) ; in staff-space
103 (before-line-breaking-callback . ,Beam::before_line_breaking)
104 (after-line-breaking-callback . ,Beam::after_line_breaking)
105 (neutral-direction . -1)
106 (dir-function . ,beam-dir-majority)
107 (height-quants . ,default-beam-dy-quants)
108 (vertical-position-quant-function . ,default-beam-y-quants)
109 (beamed-stem-shorten . (0.5))
110 (outer-stem-length-limit . 0.2)
112 (flag-width-function . ,default-beam-flag-width-function)
113 (space-function . ,default-beam-space-function)
116 (meta . ,(grob-description beam-interface))
123 (space-alist . ,default-break-align-space-alist)
124 (meta . ,(grob-description
125 axis-group-interface align-interface
132 (X-offset-callbacks . (,Break_align_interface::alignment_callback))
134 (meta . ,(grob-description axis-group-interface))
138 (break-align-symbol . Breathing_sign)
140 (molecule-callback . ,Text_item::brew_molecule)
142 (font-family . music)
143 (text . "scripts-rcomma")
144 (Y-offset-callbacks . (,Breathing_sign::offset_callback))
145 (visibility-lambda . ,begin-of-line-invisible)
146 (meta . ,(grob-description break-aligned-interface text-interface font-interface))
150 (molecule-callback . ,Clef::brew_molecule)
151 (before-line-breaking-callback . ,Clef::before_line_breaking)
153 (font-family . music)
154 (break-align-symbol . Clef_item)
155 (visibility-lambda . ,begin-of-line-visible)
156 (Y-offset-callbacks . (,Staff_symbol_referencer::callback))
157 (meta . ,(grob-description clef-interface font-interface break-aligned-interface ))
161 (molecule-callback . ,Chord_name::brew_molecule)
162 (after-line-breaking-callback . ,Chord_name::after_line_breaking)
163 (chord-name-function . ,default-chord-name-function)
164 (font-family . roman)
165 (meta . ,(grob-description font-interface text-interface chord-name-interface))
169 (break-align-symbol . Custos)
171 (molecule-callback . ,Custos::brew_molecule)
172 (visibility-lambda . ,end-of-line-visible)
174 (neutral-position . 0)
175 (neutral-direction . -1)
176 (adjust-if-on-staffline . #t)
177 (Y-offset-callbacks . (,Staff_symbol_referencer::callback))
178 (font-family . music)
179 (meta . ,(grob-description custos-interface staff-symbol-referencer-interface break-aligned-interface) )
186 (X-extent-callback . ,Axis_group_interface::group_extent_callback)
188 (X-offset-callbacks . (,Dot_column::side_position))
189 (meta . ,(grob-description dot-column-interface axis-group-interface))
193 (molecule-callback . ,Dots::brew_molecule)
195 (staff-position . 0.0)
196 (Y-offset-callbacks . (,Dots::quantised_position_callback ,Staff_symbol_referencer::callback))
197 (meta . ,(grob-description font-interface dots-interface ))
200 . ((molecule-callback . ,Percent_repeat_item_interface::double_percent)
203 (font-family . music)
206 (break-align-symbol . Staff_bar)
207 (visibility-lambda . ,begin-of-line-invisible)
208 (meta . ,(grob-description font-interface percent-repeat-interface))
212 (Y-offset-callbacks . (,Side_position_interface::aligned_on_self))
213 (molecule-callback . ,Text_item::brew_molecule)
214 (X-offset-callbacks . (,Side_position_interface::aligned_on_self))
215 (self-alignment-X . 0)
217 (no-spacing-rods . #t)
218 (script-priority . 100)
220 (font-family . dynamic)
221 (font-shape . italic)
222 (self-alignment-Y . 0)
223 (meta . ,(grob-description font-interface text-interface dynamic-interface))
226 (DynamicLineSpanner . (
229 (minimum-space . 1.2)
231 (meta . ,(grob-description dynamic-interface axis-group-interface side-position-interface))
235 (break-align-symbol . Left_edge_item)
236 (X-offset-callbacks . (,Break_align_interface::alignment_callback))
238 (meta . ,(grob-description break-aligned-interface))
242 (molecule-callback . ,Text_item::brew_molecule)
243 (X-offset-callbacks . (,Side_position_interface::centered_on_parent ,Side_position_interface::aligned_on_self))
246 (self-alignment-X . 0)
247 (self-alignment-Y . 0)
248 (font-family . number)
249 (font-relative-size . -3)
250 (font-shape . upright)
251 (meta . ,(grob-description finger-interface font-interface text-script-interface text-interface side-position-interface))
255 (HaraKiriVerticalGroup . (
256 (Y-offset-callbacks . (,Hara_kiri_group_spanner::force_hara_kiri_callback))
257 (Y-extent-callback . ,Hara_kiri_group_spanner::y_extent)
259 (meta . ,(grob-description axis-group-interface hara-kiri-group-interface))
262 (molecule-callback . ,Hairpin::brew_molecule)
265 (spacing-procedure . ,Spanner::set_spacing_rods)
266 (minimum-length . 2.0)
267 (if-text-padding . 1.0)
268 (width-correct . -1.0)
270 (dash-thickness . 1.2)
272 (self-alignment-Y . 0)
273 (Y-offset-callbacks . (,Side_position_interface::aligned_on_self))
274 (meta . ,(grob-description hairpin-interface dynamic-interface))
279 (Y-offset-callbacks . (,Side_position_interface::aligned_on_self
280 ,Side_position_interface::aligned_on_support_refpoints
283 (self-alignment-Y . 0)
284 (molecule-callback . ,Text_item::brew_molecule)
285 (break-align-symbol . Instrument_name)
286 (visibility-lambda . ,begin-of-line-visible)
288 (font-family . roman)
289 (meta . ,(grob-description font-interface text-interface break-aligned-interface))
293 (molecule-callback . ,Key_item::brew_molecule)
294 (break-align-symbol . Key_item)
295 (visibility-lambda . ,begin-of-line-visible)
297 (meta . ,(grob-description key-signature-interface font-interface break-aligned-interface))
304 (minimum-length . 0.5)
305 (maximum-length . 100)
306 (molecule-callback . ,Hyphen_spanner::brew_molecule)
307 (Y-extent-callback . ,Grob::point_dimension_callback)
308 (meta . ,(grob-description lyric-hyphen-interface ))
313 (meta . ,(grob-description line-of-score-interface axis-group-interface))
317 (molecule-callback . ,Lyric_extender::brew_molecule)
318 (height . 0.8) ; stafflinethickness;
319 (right-trim-amount . 0.5)
320 (Y-extent-callback . ,Grob::point_dimension_callback)
321 (meta . ,(grob-description lyric-extender-interface))
325 (molecule-callback . ,Text_item::brew_molecule)
326 (X-offset-callbacks . (,Side_position_interface::aligned_on_self))
327 (self-alignment-X . 0)
330 (ignore-length-mismatch . #f)
331 (begin-alignment . 4)
333 (font-family . roman)
334 (font-shape . upright)
335 (meta . ,(grob-description lyric-syllable-interface text-interface font-interface ))
340 (auto-properties . #f)
342 (porrectus-width . 2.4)
343 (line-thickness . 1.0)
346 (molecule-callback . ,Porrectus::brew_molecule)
347 (meta . ,(grob-description porrectus-interface))
351 (molecule-callback . ,Text_item::brew_molecule)
352 (X-offset-callbacks . (,Side_position_interface::aligned_on_self))
353 (self-alignment-X . 0)
357 (font-family . roman)
358 (font-shape . upright)
359 (font-relative-size . 1)
360 (visibility-lambda . ,end-of-line-invisible)
362 (meta . ,(grob-description mark-interface side-position-interface))
365 (MultiMeasureRest . (
366 (spacing-procedure . ,Multi_measure_rest::set_spacing_rods)
367 (molecule-callback . ,Multi_measure_rest::brew_molecule)
368 (Y-offset-callbacks . (,Staff_symbol_referencer::callback))
371 (padding . 2.0) ; staffspace
372 (minimum-width . 12.5) ; staffspace
373 (font-family . number)
374 (font-relative-size . 1)
375 (meta . ,(grob-description multi-measure-rest-interface rest-interface font-interface ))
379 ;; Ugh, should not be hard-coded.
381 (meta . ,(grob-description
382 note-collision-interface axis-group-interface
388 (meta . ,(grob-description axis-group-interface note-column-interface))
393 (molecule-callback . ,Note_head::brew_molecule)
394 (Y-offset-callbacks . (,Staff_symbol_referencer::callback))
395 (stem-attachment-function . ,note-head-style->attachment-coordinates)
396 (meta . ,(grob-description rhythmic-head-interface font-interface note-head-interface))
402 (X-extent-callback . #f)
403 (Y-extent-callback . #f)
404 (molecule-callback . ,Line_spanner::brew_molecule)
405 (meta . ,(grob-description line-spanner-interface))
411 (X-extent-callback . #f)
412 (Y-extent-callback . #f)
413 (molecule-callback . ,Line_spanner::brew_molecule)
414 (meta . ,(grob-description line-spanner-interface))
418 (molecule-callback . ,Text_item::brew_molecule)
419 (font-family . roman)
420 (meta . ,(grob-description note-name-interface font-interface))
424 (self-alignment-X . 0)
426 (visibility-lambda . ,begin-of-line-visible)
427 (X-offset-callbacks . (,Side_position_interface::centered_on_parent ,Side_position_interface::aligned_on_self))
428 (Y-offset-callbacks . (,Side_position_interface::aligned_side))
429 (molecule-callback . ,Text_item::brew_molecule)
430 (font-shape . italic)
431 (font-family . roman)
432 (meta . ,(grob-description text-interface font-interface ))
437 ; (molecule-callback . ,Paper_column::brew_molecule) (font-name . "cmr8")
438 (meta . ,(grob-description paper-column-interface axis-group-interface spaceable-element-interface))
441 (molecule-callback . ,Slur::brew_molecule)
443 (spacing-procedure . ,Spanner::set_spacing_rods)
444 (minimum-length . 1.5)
445 (after-line-breaking-callback . ,Slur::after_line_breaking)
446 (extremity-rules . ,default-slur-extremity-rules)
447 (extremity-offset-alist . ,default-phrasing-slur-extremity-offset-alist)
448 (de-uglify-parameters . ( 1.5 0.8 -2.0))
449 (Y-extent-callback . ,Slur::height)
450 (details . ((height-limit . 2.0) (ratio . 0.333) (force-blowfit . 0.5)
451 (bezier-pct-c0 . -0.2) (bezier-pct-c3 . 0.000006)
452 (bezier-pct-out-max . 0.8) (bezier-pct-in-max . 1.2)
453 (bezier-area-steps . 1.0)))
456 (attachment . (#f . #f))
457 (attachment-offset . ((0 . 0) . (0 . 0)))
459 (meta . ,(grob-description slur-interface))
462 (NonMusicalPaperColumn . (
464 ; (molecule-callback . ,Paper_column::brew_molecule) (font-name . "cmr8")
465 (meta . ,(grob-description paper-column-interface axis-group-interface spaceable-element-interface))
469 (spacing-procedure . ,Multi_measure_rest::set_spacing_rods)
470 (molecule-callback . ,Multi_measure_rest::percent)
473 (minimum-width . 12.5) ; staffspace
474 (font-family . music)
475 (meta . ,(grob-description multi-measure-rest-interface font-interface percent-repeat-interface))
480 (molecule-callback . , Percent_repeat_item_interface::beat_slash)
483 (meta . ,(grob-description percent-repeat-interface))
486 (after-line-breaking-callback . ,Rest::after_line_breaking)
487 (X-extent-callback . ,Rest::extent_callback)
488 (Y-extent-callback . ,Rest::extent_callback)
489 (molecule-callback . ,Rest::brew_molecule)
490 (Y-offset-callbacks . (,Staff_symbol_referencer::callback))
491 (minimum-beam-collision-distance . 1.5)
492 (meta . ,(grob-description
493 rhythmic-head-interface
494 staff-symbol-referencer-interface
498 (minimum-distance . 0.75)
499 (meta . ,(grob-description rest-collision-interface ))
503 ;; don't set direction here: it breaks staccato.
504 (molecule-callback . ,Script::brew_molecule)
506 (X-offset-callbacks . (,Side_position_interface::centered_on_parent))
507 (before-line-breaking-callback . ,Script::before_line_breaking)
508 (meta . ,(grob-description script-interface side-position-interface font-interface))
512 (before-line-breaking-callback . ,Script_column::before_line_breaking)
513 (meta . ,(grob-description script-column-interface))
517 (molecule-callback . ,Slur::brew_molecule)
519 (spacing-procedure . ,Spanner::set_spacing_rods)
520 (minimum-length . 1.5)
521 (after-line-breaking-callback . ,Slur::after_line_breaking)
522 (extremity-rules . ,default-slur-extremity-rules)
523 (extremity-offset-alist . ,default-slur-extremity-offset-alist)
524 (de-uglify-parameters . ( 1.5 0.8 -2.0))
525 (Y-extent-callback . ,Slur::height)
526 (details . ((height-limit . 2.0) (ratio . 0.333) (force-blowfit . 0.5)
527 (bezier-pct-c0 . -0.2) (bezier-pct-c3 . 0.000006)
528 (bezier-pct-out-max . 0.8) (bezier-pct-in-max . 1.2)
529 (bezier-area-steps . 1.0)))
532 (attachment . (#f . #f))
533 (attachment-offset . ((0 . 0) . (0 . 0)))
535 (meta . ,(grob-description slur-interface))
539 (spacing-procedure . ,Third_spacing_spanner::set_springs)
540 (grace-space-factor . 0.8)
542 ;; TODO: change naming -- unintuitive
543 (arithmetic-basicspace . 2.0)
544 (arithmetic-multiplier . ,(* 0.9 1.32))
546 ;; assume that notes at least this long are present.
547 (maximum-duration-for-spacing . ,(make-moment 1 8))
548 (meta . ,(grob-description spacing-spanner-interface))
551 (break-align-symbol . Staff_bar)
552 (bar-size-procedure . ,Span_bar::get_bar_size)
553 (molecule-callback . ,Span_bar::brew_molecule)
554 (visibility-lambda . ,begin-of-line-invisible)
555 (X-extent-callback . ,Span_bar::width_callback)
558 (before-line-breaking-callback . ,Span_bar::before_line_breaking)
562 ;; Ross. page 151 lists other values, we opt for a leaner look
566 (hair-thickness . 1.6)
567 (thick-thickness . 6.0)
568 (meta . ,(grob-description span-bar-interface bar-line-interface ))
573 (molecule-callback . ,Text_item::brew_molecule)
574 (break-align-symbol . Clef_item)
575 (visibility-lambda . ,begin-of-line-visible)
576 (font-family . roman)
577 (meta . ,(grob-description break-aligned-interface text-interface font-interface))
582 (X-extent-callback . #f)
583 (Y-extent-callback . #f)
585 (meta . ,(grob-description staff-spacing-interface))
588 (X-extent-callback . #f)
589 (Y-extent-callback . #f)
590 (stem-spacing-correction . 0.)
592 (meta . ,(grob-description note-spacing-interface))
596 (molecule-callback . ,Staff_symbol::brew_molecule)
600 (meta . ,(grob-description staff-symbol-interface ))
603 (molecule-callback . ,Text_item::brew_molecule)
605 (X-offset-callbacks . (,Side_position_interface::aligned_on_self))
606 (Y-offset-callbacks .
607 (,Side_position_interface::aligned_side
608 ,Side_position_interface::centered_on_parent))
609 (no-spacing-rods . #t)
610 (font-shape . italic)
611 (self-alignment-X . 0)
612 (meta . ,(grob-description text-interface font-interface))
616 (before-line-breaking-callback . ,Stem::before_line_breaking)
617 (molecule-callback . ,Stem::brew_molecule)
619 (beamed-lengths . (0.0 2.5 2.0 1.5))
620 (beamed-minimum-lengths . (0.0 1.5 1.25 1.0))
622 ;; Stems in unnatural (forced) direction should be shortened,
623 ;; according to [Roush & Gourlay]. Their suggestion to knock off
624 ;; a whole staffspace seems a bit drastical: we'll do half.
626 (lengths . (3.5 3.5 3.5 4.5 5.0))
627 (stem-shorten . (0.5))
628 ; if stem is on middle line, choose this direction.
629 (neutral-direction . -1)
630 (X-offset-callbacks . (,Stem::off_callback))
631 (X-extent-callback . ,Stem::dim_callback)
632 (Y-extent-callback . ,Stem::height)
633 (adjust-if-on-staffline . #t)
634 (font-family . music)
635 (meta . ,(grob-description stem-interface font-interface))
639 (molecule-callback . ,Stem_tremolo::brew_molecule)
640 (Y-extent-callback . ,Stem_tremolo::height)
641 (X-extent-callback . #f)
643 (beam-width . 2.0) ; staff-space
644 (beam-thickness . 0.42) ; staff-space
645 (beam-space-function . ,default-beam-space-function)
646 (meta . ,(grob-description stem-tremolo-interface ))
650 (meta . ,(grob-description separation-item-interface ))
652 (SeparatingGroupSpanner . (
653 (spacing-procedure . ,Separating_group_spanner::set_spacing_rods)
654 (meta . ,(grob-description separation-spanner-interface))
658 (no-spacing-rods . #t)
659 (molecule-callback . ,Sustain_pedal::brew_molecule)
660 (self-alignment-X . 0)
662 (X-offset-callbacks . (,Side_position_interface::aligned_on_self))
663 (Y-offset-callbacks .
664 (,Side_position_interface::aligned_side
665 ,Side_position_interface::centered_on_parent))
667 (meta . ,(grob-description sustain-pedal-interface side-position-interface font-interface))
670 ;; TODO: should split in 3
671 (SystemStartBrace . (
673 (molecule-callback . ,System_start_delimiter::brew_molecule)
674 (collapse-height . 5.0)
675 (font-family . braces)
676 (Y-extent-callback . #f)
677 (meta . ,(grob-description system-start-delimiter-interface font-interface))
679 (SystemStartBracket . (
680 (Y-extent-callback . #f)
681 (molecule-callback . ,System_start_delimiter::brew_molecule)
687 (bracket-collapse-height . 1)
689 (meta . ,(grob-description system-start-delimiter-interface ))
692 (Y-extent-callback . #f)
693 (molecule-callback . ,System_start_delimiter::brew_molecule)
696 (after-line-breaking-callback . ,System_start_delimiter::after_line_breaking)
697 (meta . ,(grob-description system-start-delimiter-interface ))
701 (molecule-callback . ,Text_item::brew_molecule)
702 (no-spacing-rods . #t)
705 ;; todo: add X self alignment?
707 (font-family . roman)
708 (meta . ,(grob-description text-script-interface text-interface side-position-interface font-interface ))
711 (molecule-callback . ,Text_spanner::brew_molecule)
712 (font-family . roman)
715 ;; urg, only for (de)cresc. text spanners
716 (if-text-padding . 1.0)
720 (meta . ,(grob-description text-spanner-interface font-interface))
723 (molecule-callback . ,Tie::brew_molecule)
724 (spacing-procedure . ,Spanner::set_spacing_rods)
725 (staffline-clearance . 0.35)
726 (details . ((ratio . 0.333) (height-limit . 1.0)))
730 (minimum-length . 2.5)
731 (meta . ,(grob-description tie-interface ))
735 (after-line-breaking-callback . ,Tie_column::after_line_breaking)
736 (meta . ,(grob-description tie-column-interface ))
740 (molecule-callback . ,Time_signature::brew_molecule)
741 (break-align-symbol . Time_signature)
742 (visibility-lambda . ,all-visible)
745 (font-family . number)
746 (meta . ,(grob-description time-signature-interface font-interface))
752 (after-line-breaking-callback . ,Tuplet_bracket::after_line_breaking)
753 (molecule-callback . ,Tuplet_bracket::brew_molecule)
754 (font-family . roman)
755 (font-shape . italic)
756 (font-relative-size . -1)
757 (meta . ,(grob-description text-interface
758 tuplet-bracket-interface font-interface))
762 (molecule-callback . ,Text_item::brew_molecule)
763 (font-family . roman)
764 (font-shape . italic)
765 (no-spacing-rods . #t)
766 (self-alignment-X . 0)
768 (X-offset-callbacks . (,Side_position_interface::aligned_on_self))
769 (Y-offset-callbacks .
770 (,Side_position_interface::aligned_side
771 ,Side_position_interface::centered_on_parent))
772 (meta . ,(grob-description text-interface font-interface))
776 (molecule-callback . ,Volta_spanner::brew_molecule)
781 (Y-offset-callbacks . (,Side_position_interface::aligned_side))
782 (thickness . 1.6) ; stafflinethickness
783 (height . 2.0) ; staffspace;
785 (font-family . number)
786 (font-relative-size . -2)
787 (meta . ,(grob-description volta-bracket-interface side-position-interface font-interface))
789 (VerticalAlignment . (
791 (Y-extent-callback . ,Axis_group_interface::group_extent_callback)
792 (X-extent-callback . #f)
795 (meta . ,(grob-description align-interface axis-group-interface))
797 (VerticalAxisGroup . (
799 (meta . ,(grob-description axis-group-interface))
806 (define (completize-grob-entry x)
807 "transplant assoc key into 'name entry of 'meta of X
809 (let* ((name-sym (car x))
811 (metaentry (cdr (assoc 'meta entry)))
812 (new-metaentry (assoc-set! metaentry 'name name-sym))
815 (cons name-sym (assoc-set! entry 'meta new-metaentry))
818 (set! all-grob-descriptions (map completize-grob-entry all-grob-descriptions))
822 ; (display (map pair? all-grob-descriptions))
825 ;; make sure that \property Foo.Bar =\turnOff doesn't complain
827 (map (lambda (x) (set-object-property! (car x) 'translator-type? list?))
828 all-grob-descriptions)