1 ;;;; This file is part of LilyPond, the GNU music typesetter.
3 ;;;; Copyright (C) 1998--2010 Jan Nieuwenhuizen <janneke@gnu.org>
4 ;;;; Han-Wen Nienhuys <hanwen@xs4all.nl>
6 ;;;; LilyPond is free software: you can redistribute it and/or modify
7 ;;;; it under the terms of the GNU General Public License as published by
8 ;;;; the Free Software Foundation, either version 3 of the License, or
9 ;;;; (at your option) any later version.
11 ;;;; LilyPond is distributed in the hope that it will be useful,
12 ;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
13 ;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 ;;;; GNU General Public License for more details.
16 ;;;; You should have received a copy of the GNU General Public License
17 ;;;; along with LilyPond. If not, see <http://www.gnu.org/licenses/>.
19 ; for take, drop, take-while, list-index, and find-tail:
20 (use-modules (srfi srfi-1))
22 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
27 (define-safe-public START -1)
28 (define-safe-public STOP 1)
29 (define-public LEFT -1)
30 (define-public RIGHT 1)
32 (define-public DOWN -1)
33 (define-public CENTER 0)
35 (define-safe-public DOUBLE-FLAT-QTS -4)
36 (define-safe-public THREE-Q-FLAT-QTS -3)
37 (define-safe-public FLAT-QTS -2)
38 (define-safe-public SEMI-FLAT-QTS -1)
39 (define-safe-public NATURAL-QTS 0)
40 (define-safe-public SEMI-SHARP-QTS 1)
41 (define-safe-public SHARP-QTS 2)
42 (define-safe-public THREE-Q-SHARP-QTS 3)
43 (define-safe-public DOUBLE-SHARP-QTS 4)
44 (define-safe-public SEMI-TONE-QTS 2)
46 (define-safe-public DOUBLE-FLAT -1)
47 (define-safe-public THREE-Q-FLAT -3/4)
48 (define-safe-public FLAT -1/2)
49 (define-safe-public SEMI-FLAT -1/4)
50 (define-safe-public NATURAL 0)
51 (define-safe-public SEMI-SHARP 1/4)
52 (define-safe-public SHARP 1/2)
53 (define-safe-public THREE-Q-SHARP 3/4)
54 (define-safe-public DOUBLE-SHARP 1)
55 (define-safe-public SEMI-TONE 1/2)
57 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
60 (define-public ZERO-MOMENT (ly:make-moment 0 1))
62 (define-public (moment-min a b)
63 (if (ly:moment<? a b) a b))
65 (define-public (moment<=? a b)
69 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
71 (define-public (average x . lst)
72 (/ (+ x (apply + lst)) (1+ (length lst))))
74 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
75 ;; parser <-> output hooks.
77 (define-public (collect-bookpart-for-book parser book-part)
78 "Toplevel book-part handler"
79 (define (add-bookpart book-part)
81 parser 'toplevel-bookparts
82 (cons book-part (ly:parser-lookup parser 'toplevel-bookparts))))
83 ;; If toplevel scores have been found before this \bookpart,
84 ;; add them first to a dedicated bookpart
85 (if (pair? (ly:parser-lookup parser 'toplevel-scores))
87 (add-bookpart (ly:make-book-part
88 (ly:parser-lookup parser 'toplevel-scores)))
89 (ly:parser-define! parser 'toplevel-scores (list))))
90 (add-bookpart book-part))
92 (define-public (collect-scores-for-book parser score)
94 parser 'toplevel-scores
95 (cons score (ly:parser-lookup parser 'toplevel-scores))))
97 (define-public (collect-music-aux score-handler parser music)
98 (define (music-property symbol)
99 (let ((value (ly:music-property music symbol)))
100 (if (not (null? value))
103 (cond ((music-property 'page-marker)
104 ;; a page marker: set page break/turn permissions or label
106 (let ((label (music-property 'page-label)))
108 (score-handler (ly:make-page-label-marker label))))
109 (for-each (lambda (symbol)
110 (let ((permission (music-property symbol)))
111 (if (symbol? permission)
113 (ly:make-page-permission-marker symbol
114 (if (eqv? 'forbid permission)
117 (list 'line-break-permission 'page-break-permission
118 'page-turn-permission))))
119 ((not (music-property 'void))
120 ;; a regular music expression: make a score with this music
121 ;; void music is discarded
122 (score-handler (scorify-music music parser)))))
124 (define-public (collect-music-for-book parser music)
125 "Top-level music handler"
126 (collect-music-aux (lambda (score)
127 (collect-scores-for-book parser score))
131 (define-public (collect-book-music-for-book parser book music)
133 (collect-music-aux (lambda (score)
134 (ly:book-add-score! book score))
138 (define-public (scorify-music music parser)
141 (for-each (lambda (func)
142 (set! music (func music parser)))
143 toplevel-music-functions)
145 (ly:make-score music))
148 (define (get-current-filename parser)
149 "return any suffix value for output filename allowing for settings by
150 calls to bookOutputName function"
151 (let ((book-filename (ly:parser-lookup parser 'book-filename)))
152 (if (not book-filename)
153 (ly:parser-output-name parser)
156 (define (get-current-suffix parser)
157 "return any suffix value for output filename allowing for settings by calls to
159 (let ((book-output-suffix (ly:parser-lookup parser 'book-output-suffix)))
160 (if (not (string? book-output-suffix))
161 (ly:parser-lookup parser 'output-suffix)
162 book-output-suffix)))
164 (define-public current-outfile-name #f) ; for use by regression tests
166 (define (get-outfile-name parser)
167 "return current filename for generating backend output files"
168 ;; user can now override the base file name, so we have to use
169 ;; the file-name concatenated with any potential output-suffix value
170 ;; as the key to out internal a-list
171 (let* ((base-name (get-current-filename parser))
172 (output-suffix (get-current-suffix parser))
173 (alist-key (format "~a~a" base-name output-suffix))
174 (counter-alist (ly:parser-lookup parser 'counter-alist))
175 (output-count (assoc-get alist-key counter-alist 0))
177 ;; Allow all ASCII alphanumerics, including accents
178 (if (string? output-suffix)
182 (string-regexp-substitute
187 ;; assoc-get call will always have returned a number
188 (if (> output-count 0)
189 (set! result (format #f "~a-~a" result output-count)))
192 parser 'counter-alist
193 (assoc-set! counter-alist alist-key (1+ output-count)))
194 (set! current-outfile-name result)
197 (define (print-book-with parser book process-procedure)
198 (let* ((paper (ly:parser-lookup parser '$defaultpaper))
199 (layout (ly:parser-lookup parser '$defaultlayout))
200 (outfile-name (get-outfile-name parser)))
201 (process-procedure book paper layout outfile-name)))
203 (define-public (print-book-with-defaults parser book)
204 (print-book-with parser book ly:book-process))
206 (define-public (print-book-with-defaults-as-systems parser book)
207 (print-book-with parser book ly:book-process-to-systems))
209 ;; Add a score to the current bookpart, book or toplevel
210 (define-public (add-score parser score)
212 ((ly:parser-lookup parser '$current-bookpart)
213 ((ly:parser-lookup parser 'bookpart-score-handler)
214 (ly:parser-lookup parser '$current-bookpart) score))
215 ((ly:parser-lookup parser '$current-book)
216 ((ly:parser-lookup parser 'book-score-handler)
217 (ly:parser-lookup parser '$current-book) score))
219 ((ly:parser-lookup parser 'toplevel-score-handler) parser score))))
221 (define-public (add-text parser text)
222 (add-score parser (list text)))
224 (define-public (add-music parser music)
225 (collect-music-aux (lambda (score)
226 (add-score parser score))
234 (define-public assoc-get ly:assoc-get)
236 (define-public chain-assoc-get ly:chain-assoc-get)
238 (define-public (uniqued-alist alist acc)
239 (if (null? alist) acc
240 (if (assoc (caar alist) acc)
241 (uniqued-alist (cdr alist) acc)
242 (uniqued-alist (cdr alist) (cons (car alist) acc)))))
244 (define-public (alist<? x y)
245 (string<? (symbol->string (car x))
246 (symbol->string (car y))))
248 (define (map-alist-vals func list)
249 "map FUNC over the vals of LIST, leaving the keys."
252 (cons (cons (caar list) (func (cdar list)))
253 (map-alist-vals func (cdr list)))))
255 (define (map-alist-keys func list)
256 "map FUNC over the keys of an alist LIST, leaving the vals. "
259 (cons (cons (func (caar list)) (cdar list))
260 (map-alist-keys func (cdr list)))))
262 (define-public (first-member members lst)
263 "Return first successful MEMBER of member from MEMBERS in LST."
266 (let ((m (member (car members) lst)))
267 (if m m (first-member (cdr members) lst)))))
269 (define-public (first-assoc keys lst)
270 "Return first successful ASSOC of key from KEYS in LST."
273 (let ((k (assoc (car keys) lst)))
274 (if k k (first-assoc (cdr keys) lst)))))
276 (define-public (flatten-alist alist)
281 (flatten-alist (cdr alist))))))
283 (define (assoc-remove key alist)
284 "Remove key (and its corresponding value) from an alist.
285 Different than assoc-remove! because it is non-destructive."
286 (define (assoc-crawler key l r)
289 (if (equal? (caar r) key)
291 (assoc-crawler key (append l `(,(car r))) (cdr r)))))
292 (assoc-crawler key '() alist))
294 (define-public (map-selected-alist-keys function keys alist)
295 "Returns alist with function applied to all of the values in list keys.
297 @code{guile> (map-selected-alist-keys - '(a b) '((a . 1) (b . -2) (c . 3) (d . 4)))}
298 @code{((a . -1) (b . 2) (c . 3) (d . 4))}"
299 (define (map-selected-alist-keys-helper function key alist)
302 (if (equal? key (car pair))
303 (cons key (function (cdr pair)))
308 (map-selected-alist-keys
311 (map-selected-alist-keys-helper function (car keys) alist))))
316 (define-public (vector-for-each proc vec)
319 ((>= i (vector-length vec)) vec)
320 (vector-set! vec i (proc (vector-ref vec i)))))
325 (define-public (hash-table->alist t)
326 (hash-fold (lambda (k v acc) (acons k v acc))
329 ;; todo: code dup with C++.
330 (define-safe-public (alist->hash-table lst)
331 "Convert alist to table"
332 (let ((m (make-hash-table (length lst))))
333 (map (lambda (k-v) (hashq-set! m (car k-v) (cdr k-v))) lst)
339 (define (functional-or . rest)
342 (apply functional-or (cdr rest)))
345 (define (functional-and . rest)
348 (apply functional-and (cdr rest)))
351 (define (split-list lst n)
352 "Split LST in N equal sized parts"
354 (define (helper todo acc-vector k)
361 (vector-set! acc-vector k (cons (car todo) (vector-ref acc-vector k)))
362 (helper (cdr todo) acc-vector (1- k)))))
364 (helper lst (make-vector n '()) (1- n)))
366 (define (list-element-index lst x)
367 (define (helper todo k)
370 ((equal? (car todo) x) k)
372 (helper (cdr todo) (1+ k)))))
376 (define-public (count-list lst)
377 "Given lst (E1 E2 .. ) return ((E1 . 1) (E2 . 2) ... ) "
379 (define (helper l acc count)
381 (helper (cdr l) (cons (cons (car l) count) acc) (1+ count))
385 (reverse (helper lst '() 1)))
387 (define-public (list-join lst intermediate)
388 "put INTERMEDIATE between all elts of LST."
393 (cons elem (cons intermediate prev))
397 (define-public (filtered-map proc lst)
402 (define-public (flatten-list x)
404 (cond ((null? x) '())
405 ((not (pair? x)) (list x))
406 (else (append (flatten-list (car x))
407 (flatten-list (cdr x))))))
409 (define (list-minus a b)
410 "Return list of elements in A that are not in B."
411 (lset-difference eq? a b))
413 (define-public (uniq-list lst)
414 "Uniq LST, assuming that it is sorted. Uses equal? for comparisons."
417 (fold (lambda (x acc)
420 (if (equal? x (car acc))
425 (define (split-at-predicate pred lst)
426 "Split LST into two lists at the first element that returns #f for
427 (PRED previous_element element). Return the two parts as a pair.
428 Example: (split-at-predicate < '(1 2 3 2 1)) ==> ((1 2 3) . (2 1))"
431 (let ((i (list-index (lambda (x y) (not (pred x y)))
435 (cons (take lst (1+ i)) (drop lst (1+ i)))
438 (define-public (split-list-by-separator lst pred)
439 "Split LST at each element that satisfies PRED, and return the parts
440 (with the separators removed) as a list of lists. Example:
441 (split-list-by-separator '(a 0 b c 1 d) number?) ==> ((a) (b c) (d))"
442 (let loop ((result '()) (lst lst))
443 (if (and lst (not (null? lst)))
446 (list (take-while (lambda (x) (not (pred x))) lst)))
447 (let ((tail (find-tail pred lst)))
448 (if tail (cdr tail) #f)))
451 (define-public (offset-add a b)
452 (cons (+ (car a) (car b))
453 (+ (cdr a) (cdr b))))
455 (define-public (offset-flip-y o)
456 (cons (car o) (- (cdr o))))
458 (define-public (offset-scale o scale)
459 (cons (* (car o) scale)
462 (define-public (ly:list->offsets accum coords)
465 (cons (cons (car coords) (cadr coords))
466 (ly:list->offsets accum (cddr coords)))))
468 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
471 (define-public empty-interval '(+inf.0 . -inf.0))
473 (define-public (symmetric-interval expr)
474 (cons (- expr) expr))
476 (define-public (interval-length x)
477 "Length of the number-pair X, when an interval"
478 (max 0 (- (cdr x) (car x))))
480 (define-public (ordered-cons a b)
484 (define-public (interval-bound interval dir)
485 ((if (= dir RIGHT) cdr car) interval))
487 (define-public (interval-index interval dir)
488 "Interpolate INTERVAL between between left (DIR=-1) and right (DIR=+1)"
490 (* (+ (interval-start interval) (interval-end interval)
491 (* dir (- (interval-end interval) (interval-start interval))))
494 (define-public (interval-center x)
495 "Center the number-pair X, when an interval"
496 (if (interval-empty? x)
498 (/ (+ (car x) (cdr x)) 2)))
500 (define-public interval-start car)
502 (define-public interval-end cdr)
504 (define (other-axis a)
505 (remainder (+ a 1) 2))
507 (define-public (interval-widen iv amount)
508 (cons (- (car iv) amount)
509 (+ (cdr iv) amount)))
511 (define-public (interval-empty? iv)
512 (> (car iv) (cdr iv)))
514 (define-public (interval-union i1 i2)
516 (min (car i1) (car i2))
517 (max (cdr i1) (cdr i2))))
519 (define-public (interval-intersection i1 i2)
521 (max (car i1) (car i2))
522 (min (cdr i1) (cdr i2))))
524 (define-public (interval-sane? i)
525 (not (or (nan? (car i))
529 (> (car i) (cdr i)))))
531 (define-public (add-point interval p)
532 (cons (min (interval-start interval) p)
533 (max (interval-end interval) p)))
535 (define-public (reverse-interval iv)
536 (cons (cdr iv) (car iv)))
538 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
544 (define (coord-operation operator operand coordinate)
546 (cons (operator (coord-x operand) (coord-x coordinate))
547 (operator (coord-y operand) (coord-y coordinate)))
548 (cons (operator operand (coord-x coordinate))
549 (operator operand (coord-y coordinate)))))
551 (define (coord-apply function coordinate)
554 ((coord-x function) (coord-x coordinate))
555 ((coord-y function) (coord-y coordinate)))
557 (function (coord-x coordinate))
558 (function (coord-y coordinate)))))
560 (define-public (coord-translate coordinate amount)
561 (coord-operation + amount coordinate))
563 (define-public (coord-scale coordinate amount)
564 (coord-operation * amount coordinate))
566 (define-public (coord-rotate coordinate degrees-in-radians)
570 (exact->inexact (coord-x coordinate))
571 (exact->inexact (coord-y coordinate))))
574 (+ (* (coord-x coordinate) (coord-x coordinate))
575 (* (coord-y coordinate) (coord-y coordinate)))))
576 (angle (angle-0-2pi (atan (coord-y coordinate) (coord-x coordinate)))))
578 (* radius (cos (+ angle degrees-in-radians)))
579 (* radius (sin (+ angle degrees-in-radians))))))
581 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
584 (define-public PI (* 4 (atan 1)))
586 (define-public TWO-PI (* 2 PI))
588 (define-public PI-OVER-TWO (/ PI 2))
590 (define-public THREE-PI-OVER-TWO (* 3 PI-OVER-TWO))
592 (define-public (cyclic-base-value value cycle)
593 "Takes a value and modulo-maps it between 0 and base."
595 (cyclic-base-value (+ value cycle) cycle)
597 (cyclic-base-value (- value cycle) cycle)
600 (define-public (angle-0-2pi angle)
601 "Takes an angle in radians and maps it between 0 and 2pi."
602 (cyclic-base-value angle TWO-PI))
604 (define-public (angle-0-360 angle)
605 "Takes an angle in radians and maps it between 0 and 2pi."
606 (cyclic-base-value angle 360.0))
608 (define-public PI-OVER-180 (/ PI 180))
610 (define-public (degrees->radians angle-degrees)
611 "Convert the given angle from degrees to radians"
612 (* angle-degrees PI-OVER-180))
614 (define-public (ellipse-radius x-radius y-radius angle)
616 (* x-radius y-radius)
618 (+ (* (expt y-radius 2)
619 (* (cos angle) (cos angle)))
621 (* (sin angle) (sin angle)))))))
623 (define-public (polar->rectangular radius angle-in-degrees)
624 "Convert polar coordinate @code{radius} and @code{angle-in-degrees}
625 to (x-length . y-length)"
626 (let ((complex (make-polar
628 (degrees->radians angle-in-degrees))))
631 (imag-part complex))))
633 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
636 (define-public (string-endswith s suffix)
637 (equal? suffix (substring s
638 (max 0 (- (string-length s) (string-length suffix)))
641 (define-public (string-startswith s prefix)
642 (equal? prefix (substring s 0 (min (string-length s) (string-length prefix)))))
644 (define-public (string-encode-integer i)
647 ((< i 0) (string-append "n" (string-encode-integer (- i))))
649 (make-string 1 (integer->char (+ 65 (modulo i 26))))
650 (string-encode-integer (quotient i 26))))))
652 (define (number->octal-string x)
653 (let* ((n (inexact->exact x))
654 (n64 (quotient n 64))
655 (n8 (quotient (- n (* n64 64)) 8)))
659 (number->string (remainder (- n (+ (* n64 64) (* n8 8))) 8)))))
661 (define-public (ly:inexact->string x radix)
662 (let ((n (inexact->exact x)))
663 (number->string n radix)))
665 (define-public (ly:number-pair->string c)
666 (string-append (ly:number->string (car c)) " "
667 (ly:number->string (cdr c))))
669 (define-public (dir-basename file . rest)
670 "Strip suffixes in REST, but leave directory component for FILE."
671 (define (inverse-basename x y) (basename y x))
672 (simple-format #f "~a/~a" (dirname file)
673 (fold inverse-basename file rest)))
675 (define-public (write-me message x)
676 "Return X. Display MESSAGE and write X. Handy for debugging,
677 possibly turned off."
678 (display message) (write x) (newline) x)
681 (define-public (stderr string . rest)
682 (apply format (cons (current-error-port) (cons string rest)))
683 (force-output (current-error-port)))
685 (define-public (debugf string . rest)
687 (apply stderr (cons string rest))))
689 (define (index-cell cell dir)
694 (define (cons-map f x)
695 "map F to contents of X"
696 (cons (f (car x)) (f (cdr x))))
698 (define-public (list-insert-separator lst between)
699 "Create new list, inserting BETWEEN between elements of LIST"
703 (cons x (cons between y))))
704 (fold-right conc #f lst))
706 (define-public (string-regexp-substitute a b str)
707 (regexp-substitute/global #f a str 'pre b 'post))
709 (define (regexp-split str regex)
711 (define end-of-prev-match 0)
712 (define (notice match)
714 (set! matches (cons (substring (match:string match)
718 (set! end-of-prev-match (match:end match)))
720 (regexp-substitute/global #f regex str notice 'post)
722 (if (< end-of-prev-match (string-length str))
725 (cons (substring str end-of-prev-match (string-length str)) matches)))
737 (define-public (binary-search start end getter target-val)
738 (_i "Find the index between @var{start} and @var{end} (an integer)
739 which will produce the closest match to @var{target-val} when
740 applied to function @var{getter}.")
743 (let* ((compare (quotient (+ start end) 2))
744 (get-val (getter compare)))
746 ((< target-val get-val)
747 (set! end (1- compare)))
748 ((< get-val target-val)
749 (set! start (1+ compare))))
750 (binary-search start end getter target-val))))
752 (define-public (car< a b)
755 (define-public (car<= a b)
756 (<= (car a) (car b)))
758 (define-public (symbol<? lst r)
759 (string<? (symbol->string lst) (symbol->string r)))
761 (define-public (symbol-key<? lst r)
762 (string<? (symbol->string (car lst)) (symbol->string (car r))))
764 (define-public (eval-carefully symbol module . default)
765 "Check if all symbols in expr SYMBOL are reachable
766 in module MODULE. In that case evaluate, otherwise
767 print a warning and set an optional DEFAULT."
768 (let* ((unavailable? (lambda (sym)
769 (not (module-defined? module sym))))
770 (sym-unavailable (if (pair? symbol)
773 (filter symbol? (flatten-list symbol)))
774 (if (unavailable? symbol)
777 (if (null? sym-unavailable)
779 (let* ((def (and (pair? default) (car default))))
780 (ly:programming-error
781 "cannot evaluate ~S in module ~S, setting to ~S"
782 (object->string symbol)
783 (object->string module)
784 (object->string def))
788 ;; don't confuse users with #<procedure .. > syntax.
790 (define-public (scm->string val)
791 (if (and (procedure? val)
792 (symbol? (procedure-name val)))
793 (symbol->string (procedure-name val))
795 (if (self-evaluating? val)
800 (call-with-output-string (lambda (port) (display val port)))
805 (define-public (!= lst r)
808 (define-public lily-unit->bigpoint-factor
810 ((equal? (ly:unit) "mm") (/ 72.0 25.4))
811 ((equal? (ly:unit) "pt") (/ 72.0 72.27))
812 (else (ly:error (_ "unknown unit: ~S") (ly:unit)))))
814 (define-public lily-unit->mm-factor
815 (* 25.4 (/ lily-unit->bigpoint-factor 72)))
817 ;;; FONT may be font smob, or pango font string...
818 (define-public (font-name-style font)
820 (string-downcase font)
821 (let* ((font-name (ly:font-name font))
822 (full-name (if font-name font-name (ly:font-file-name font))))
823 (string-downcase full-name))))
825 (define-public (modified-font-metric-font-scaling font)
826 (let* ((designsize (ly:font-design-size font))
827 (magnification (* (ly:font-magnification font)))
828 (scaling (* magnification designsize)))
829 (debugf "scaling:~S\n" scaling)
830 (debugf "magnification:~S\n" magnification)
831 (debugf "design:~S\n" designsize)
834 (define-public (version-not-seen-message input-file-name)
840 (_ "no \\version statement found, please add~afor future compatibility")
841 (format #f "\n\n\\version ~s\n\n" (lilypond-version)))))
843 (define-public (old-relative-not-used-message input-file-name)
848 (_ "old relative compatibility not used")))