1 ;;;; This file is part of LilyPond, the GNU music typesetter.
3 ;;;; Copyright (C) 1998--2015 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 ;; for define-safe-public when byte-compiling using Guile V2
23 (use-modules (scm safe-utility-defs))
25 (use-modules (ice-9 pretty-print))
27 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
32 (define-safe-public START -1)
33 (define-safe-public STOP 1)
34 (define-public LEFT -1)
35 (define-public RIGHT 1)
37 (define-public DOWN -1)
38 (define-public CENTER 0)
40 (define-safe-public DOUBLE-FLAT -1)
41 (define-safe-public THREE-Q-FLAT -3/4)
42 (define-safe-public FLAT -1/2)
43 (define-safe-public SEMI-FLAT -1/4)
44 (define-safe-public NATURAL 0)
45 (define-safe-public SEMI-SHARP 1/4)
46 (define-safe-public SHARP 1/2)
47 (define-safe-public THREE-Q-SHARP 3/4)
48 (define-safe-public DOUBLE-SHARP 1)
49 (define-safe-public SEMI-TONE 1/2)
51 (define-safe-public INFINITY-INT 1000000)
53 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
56 (define-public ZERO-MOMENT (ly:make-moment 0 1))
58 (define-public (moment-min a b)
59 (if (ly:moment<? a b) a b))
61 (define-public (moment<=? a b)
65 (define-public (fraction->moment fraction)
68 (ly:make-moment (car fraction) (cdr fraction))))
70 (define-public (moment->fraction moment)
71 (cons (ly:moment-main-numerator moment)
72 (ly:moment-main-denominator moment)))
74 (define-public (seconds->moment s context)
75 "Return a moment equivalent to s seconds at the current tempo."
76 (ly:moment-mul (ly:context-property context 'tempoWholesPerMinute)
77 (ly:make-moment (/ s 60))))
79 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
82 (define-public (duration-log-factor lognum)
83 "Given a logarithmic duration number, return the length of the duration,
84 as a number of whole notes."
85 (or (and (exact? lognum) (integer? lognum))
86 (scm-error 'wrong-type-arg "duration-log-factor" "Not an integer: ~S" (list lognum) #f))
91 (define-public (duration-dot-factor dotcount)
92 "Given a count of the dots used to extend a musical duration, return
93 the numeric factor by which they increase the duration."
94 (or (and (exact? dotcount) (integer? dotcount) (>= dotcount 0))
95 (scm-error 'wrong-type-arg "duration-dot-factor" "Not a count: ~S" (list dotcount) #f))
96 (- 2 (/ (ash 1 dotcount))))
98 (define-public (duration-length dur)
99 "Return the overall length of a duration, as a number of whole
100 notes. (Not to be confused with ly:duration-length, which returns a
101 less-useful moment object.)"
102 (ly:moment-main (ly:duration-length dur)))
104 (define-public (duration-visual dur)
105 "Given a duration object, return the visual part of the duration (base
106 note length and dot count), in the form of a duration object with
107 non-visual scale factor 1."
108 (ly:make-duration (ly:duration-log dur) (ly:duration-dot-count dur) 1))
110 (define-public (duration-visual-length dur)
111 "Given a duration object, return the length of the visual part of the
112 duration (base note length and dot count), as a number of whole notes."
113 (duration-length (duration-visual dur)))
115 (define-public (unity-if-multimeasure context dur)
116 "Given a context and a duration, return @code{1} if the duration is
117 longer than the @code{measureLength} in that context, and @code{#f} otherwise.
118 This supports historic use of @code{Completion_heads_engraver} to split
119 @code{c1*3} into three whole notes."
120 (if (ly:moment<? (ly:context-property context 'measureLength)
121 (ly:duration-length dur))
125 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
127 (define-public (average x . lst)
128 (/ (+ x (apply + lst)) (1+ (length lst))))
130 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
131 ;; parser <-> output hooks.
133 (define-public (collect-bookpart-for-book book-part)
134 "Toplevel book-part handler."
135 (define (add-bookpart book-part)
136 (ly:parser-define! 'toplevel-bookparts
137 (cons book-part (ly:parser-lookup 'toplevel-bookparts))))
138 ;; If toplevel scores have been found before this \bookpart,
139 ;; add them first to a dedicated bookpart
140 (if (pair? (ly:parser-lookup 'toplevel-scores))
142 (add-bookpart (ly:make-book-part
143 (ly:parser-lookup 'toplevel-scores)))
144 (ly:parser-define! 'toplevel-scores (list))))
145 (add-bookpart book-part))
147 (define-public (collect-scores-for-book score)
148 (ly:parser-define! 'toplevel-scores
149 (cons score (ly:parser-lookup 'toplevel-scores))))
151 (define-public (collect-music-aux score-handler music)
152 (define (music-property symbol)
153 (ly:music-property music symbol #f))
154 (cond ((music-property 'page-marker)
155 ;; a page marker: set page break/turn permissions or label
156 (let ((label (music-property 'page-label)))
158 (score-handler (ly:make-page-label-marker label))))
159 (for-each (lambda (symbol)
160 (let ((permission (music-property symbol)))
161 (if (symbol? permission)
163 (ly:make-page-permission-marker symbol
164 (if (eq? 'forbid permission)
167 '(line-break-permission page-break-permission
168 page-turn-permission)))
169 ((not (music-property 'void))
170 ;; a regular music expression: make a score with this music
171 ;; void music is discarded
172 (score-handler (scorify-music music)))))
174 (define-public (collect-music-for-book music)
175 "Top-level music handler."
176 (collect-music-aux (lambda (score)
177 (collect-scores-for-book score))
180 (define-public (collect-book-music-for-book book music)
181 "Book music handler."
182 (collect-music-aux (lambda (score)
183 (ly:book-add-score! book score))
186 (define-public (scorify-music music)
187 "Preprocess @var{music}."
189 (fold (lambda (f m) (f m))
191 toplevel-music-functions)))
193 (define (get-current-filename book)
194 "return any suffix value for output filename allowing for settings by
195 calls to bookOutputName function"
196 (or (paper-variable book 'output-filename)
197 (ly:parser-output-name)))
199 (define (get-current-suffix book)
200 "return any suffix value for output filename allowing for settings by calls to
202 (let ((book-output-suffix (paper-variable book 'output-suffix)))
203 (if (not (string? book-output-suffix))
204 (ly:parser-lookup 'output-suffix)
205 book-output-suffix)))
207 (define-public current-outfile-name #f) ; for use by regression tests
209 (define (get-outfile-name book)
210 "return current filename for generating backend output files"
211 ;; user can now override the base file name, so we have to use
212 ;; the file-name concatenated with any potential output-suffix value
213 ;; as the key to out internal a-list
214 (let* ((base-name (get-current-filename book))
215 (output-suffix (get-current-suffix book))
216 (alist-key (format #f "~a~a" base-name output-suffix))
217 (counter-alist (ly:parser-lookup 'counter-alist))
218 (output-count (assoc-get alist-key counter-alist 0))
220 ;; Allow all ASCII alphanumerics, including accents
221 (if (string? output-suffix)
225 (string-regexp-substitute
230 ;; assoc-get call will always have returned a number
231 (if (> output-count 0)
232 (set! result (format #f "~a-~a" result output-count)))
234 (ly:parser-define! 'counter-alist
235 (assoc-set! counter-alist alist-key (1+ output-count)))
236 (set! current-outfile-name result)
239 (define (print-book-with book process-procedure)
240 (let* ((paper (ly:parser-lookup '$defaultpaper))
241 (layout (ly:parser-lookup '$defaultlayout))
242 (outfile-name (get-outfile-name book)))
243 (process-procedure book paper layout outfile-name)))
245 (define-public (print-book-with-defaults book)
246 (print-book-with book ly:book-process))
248 (define-public (print-book-with-defaults-as-systems book)
249 (print-book-with book ly:book-process-to-systems))
251 ;; Add a score to the current bookpart, book or toplevel
252 (define-public (add-score score)
254 ((ly:parser-lookup '$current-bookpart)
255 ((ly:parser-lookup 'bookpart-score-handler)
256 (ly:parser-lookup '$current-bookpart) score))
257 ((ly:parser-lookup '$current-book)
258 ((ly:parser-lookup 'book-score-handler)
259 (ly:parser-lookup '$current-book) score))
261 ((ly:parser-lookup 'toplevel-score-handler) score))))
263 (define-public paper-variable
267 (append (if (and book (ly:output-def? (ly:book-paper book)))
268 (list (ly:book-paper book))
270 (ly:parser-lookup '$papers)
271 (list (ly:parser-lookup '$defaultpaper))))))
272 (make-procedure-with-setter
273 (lambda (book symbol)
274 (any (lambda (p) (ly:output-def-lookup p symbol #f))
276 (lambda (book symbol value)
277 (ly:output-def-set-variable!
278 (car (get-papers book))
281 (define-public (add-text text)
282 (add-score (list text)))
284 (define-public (add-music music)
285 (collect-music-aux (lambda (score)
289 (define-public (context-mod-from-music music)
290 (let ((warn #t) (mods (ly:make-context-mod)))
291 (let loop ((m music))
292 (if (music-is-of-type? m 'layout-instruction-event)
293 (let ((symbol (ly:music-property m 'symbol)))
296 (case (ly:music-property m 'name)
300 (ly:music-property m 'value)))
302 (list 'unset symbol))
306 (ly:music-property m 'grob-value)
308 ((ly:music-property m 'grob-property #f) => list)
310 (ly:music-property m 'grob-property-path)))))
315 ((ly:music-property m 'grob-property #f) => list)
317 (ly:music-property m 'grob-property-path))))))))
318 (case (ly:music-property m 'name)
320 (ly:add-context-mod mods
322 (ly:music-property m 'procedure))))
323 ((ContextSpeccedMusic)
324 (loop (ly:music-property m 'element)))
326 (let ((callback (ly:music-property m 'elements-callback)))
327 (if (procedure? callback)
328 (for-each loop (callback m))
329 (if (and warn (ly:duration? (ly:music-property m 'duration)))
333 (_ "Music unsuitable for context-mod"))
334 (set! warn #f)))))))))
337 (define-public (context-defs-from-music output-def music)
339 (let loop ((m music) (mods #f))
340 ;; The parser turns all sets, overrides etc into something
341 ;; wrapped in ContextSpeccedMusic. If we ever get a set,
342 ;; override etc that is not wrapped in ContextSpeccedMusic, the
343 ;; user has created it in Scheme himself without providing the
344 ;; required wrapping. In that case, using #f in the place of a
345 ;; context modification results in a reasonably recognizable
347 (if (music-is-of-type? m 'layout-instruction-event)
350 (case (ly:music-property m 'name)
353 (ly:music-property m 'symbol)
354 (ly:music-property m 'value)))
357 (ly:music-property m 'symbol)))
360 (ly:music-property m 'symbol)
361 (ly:music-property m 'grob-value)
363 ((ly:music-property m 'grob-property #f) => list)
365 (ly:music-property m 'grob-property-path)))))
368 (ly:music-property m 'symbol)
370 ((ly:music-property m 'grob-property #f) => list)
372 (ly:music-property m 'grob-property-path)))))))
373 (case (ly:music-property m 'name)
375 (ly:add-context-mod mods
377 (ly:music-property m 'procedure))))
378 ((ContextSpeccedMusic)
379 ;; Use let* here to let defs catch up with modifications
380 ;; to the context defs made in the recursion
381 (let* ((mods (loop (ly:music-property m 'element)
382 (ly:make-context-mod)))
383 (defs (ly:output-find-context-def
384 output-def (ly:music-property m 'context-type))))
388 (ly:format (_ "Cannot find context-def \\~a")
389 (ly:music-property m 'context-type)))
392 (ly:output-def-set-variable!
393 output-def (car entry)
394 (ly:context-def-modify (cdr entry) mods)))
397 (let ((callback (ly:music-property m 'elements-callback)))
398 (if (procedure? callback)
399 (fold loop mods (callback m))
400 (if (and warn (ly:duration? (ly:music-property m 'duration)))
404 (_ "Music unsuitable for output-def"))
405 (set! warn #f))))))))
412 (define-public assoc-get ly:assoc-get)
414 (define-public chain-assoc-get ly:chain-assoc-get)
416 (define-public (uniqued-alist alist acc)
417 (if (null? alist) acc
418 (if (assoc (caar alist) acc)
419 (uniqued-alist (cdr alist) acc)
420 (uniqued-alist (cdr alist) (cons (car alist) acc)))))
422 (define-public (alist<? x y)
423 (string<? (symbol->string (car x))
424 (symbol->string (car y))))
426 (define (map-alist-vals func list)
427 "map FUNC over the vals of LIST, leaving the keys."
430 (cons (cons (caar list) (func (cdar list)))
431 (map-alist-vals func (cdr list)))))
433 (define (map-alist-keys func list)
434 "map FUNC over the keys of an alist LIST, leaving the vals."
437 (cons (cons (func (caar list)) (cdar list))
438 (map-alist-keys func (cdr list)))))
440 (define-public (first-member members lst)
441 "Return first successful member (of member) from @var{members} in
443 (any (lambda (m) (member m lst)) members))
445 (define-public (first-assoc keys lst)
446 "Return first successful assoc of key from @var{keys} in @var{lst}."
447 (any (lambda (k) (assoc k lst)) keys))
449 (define-public (flatten-alist alist)
454 (flatten-alist (cdr alist))))))
456 (define-public (map-selected-alist-keys function keys alist)
457 "Return @var{alist} with @var{function} applied to all of the values
462 @code{guile> (map-selected-alist-keys - '(a b) '((a . 1) (b . -2) (c . 3) (d . 4)))}
463 @code{((a . -1) (b . 2) (c . 3) (d . 4)}
465 (define (map-selected-alist-keys-helper key alist)
468 (if (equal? key (car pair))
469 (cons key (function (cdr pair)))
472 (fold map-selected-alist-keys-helper alist keys))
477 (define-public (vector-for-each proc vec)
480 ((>= i (vector-length vec)) vec)
481 (vector-set! vec i (proc (vector-ref vec i)))))
486 (define-public (hash-table->alist t)
487 (hash-fold acons '() t))
489 ;; todo: code dup with C++.
490 (define-safe-public (alist->hash-table lst)
491 "Convert alist to table"
492 (let ((m (make-hash-table (length lst))))
493 (for-each (lambda (k-v) (hashq-set! m (car k-v) (cdr k-v))) lst)
499 (define (functional-or . rest)
502 (define (functional-and . rest)
503 (every identity rest))
505 (define (split-list lst n)
506 "Split LST in N equal sized parts"
508 (define (helper todo acc-vector k)
515 (vector-set! acc-vector k (cons (car todo) (vector-ref acc-vector k)))
516 (helper (cdr todo) acc-vector (1- k)))))
518 (helper lst (make-vector n '()) (1- n)))
520 (define (list-element-index lst x)
521 (list-index (lambda (m) (equal? m x)) lst))
523 (define-public (count-list lst)
524 "Given @var{lst} as @code{(E1 E2 .. )}, return
525 @code{((E1 . 1) (E2 . 2) ... )}."
526 (map cons lst (iota (length lst) 1)))
528 (define-public (list-join lst intermediate)
529 "Put @var{intermediate} between all elts of @var{lst}."
534 (cons elem (cons intermediate prev))
538 (define-public filtered-map filter-map)
540 (define-public (flatten-list x)
542 (let loop ((x x) (tail '()))
543 (cond ((list? x) (fold-right loop tail x))
544 ((not (pair? x)) (cons x tail))
545 (else (loop (car x) (loop (cdr x) tail))))))
547 (define (list-minus a b)
548 "Return list of elements in A that are not in B."
549 (lset-difference eq? a b))
551 (define-public (uniq-list lst)
552 "Uniq @var{lst}, assuming that it is sorted. Uses @code{equal?}
556 (fold (lambda (x acc)
559 (if (equal? x (car acc))
564 (define (split-at-predicate pred lst)
565 "Split LST into two lists at the first element that returns #f for
566 (PRED previous_element element). Return the two parts as a pair.
567 Example: (split-at-predicate < '(1 2 3 2 1)) ==> ((1 2 3) . (2 1))"
568 (let ((i (and (pair? lst)
569 (list-index (lambda (x y) (not (pred x y)))
574 (lambda () (split-at lst (1+ i)))
578 (define-public (split-list-by-separator lst pred)
579 "Split @var{lst} at each element that satisfies @var{pred}, and return
580 the parts (with the separators removed) as a list of lists. For example,
581 executing @samp{(split-list-by-separator '(a 0 b c 1 d) number?)} returns
582 @samp{((a) (b c) (d))}."
583 (call-with-values (lambda () (break pred lst))
588 (split-list-by-separator (cdr tail) pred))))))
590 (define-public (offset-add a b)
591 (cons (+ (car a) (car b))
592 (+ (cdr a) (cdr b))))
594 (define-public (offset-flip-y o)
595 (cons (car o) (- (cdr o))))
597 (define-public (offset-scale o scale)
598 (cons (* (car o) scale)
601 (define-public (ly:list->offsets accum coords)
604 (cons (cons (car coords) (cadr coords))
605 (ly:list->offsets accum (cddr coords)))))
607 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
610 (define-public empty-interval '(+inf.0 . -inf.0))
612 (define-public (symmetric-interval expr)
613 (cons (- expr) expr))
615 (define-public (interval-length x)
616 "Length of the number-pair @var{x}, if an interval."
617 (max 0 (- (cdr x) (car x))))
619 (define-public (ordered-cons a b)
623 (define-public (interval-bound interval dir)
624 ((if (= dir RIGHT) cdr car) interval))
626 (define-public (interval-index interval dir)
627 "Interpolate @var{interval} between between left (@var{dir}=-1) and
628 right (@var{dir}=+1)."
630 (* (+ (interval-start interval) (interval-end interval)
631 (* dir (- (interval-end interval) (interval-start interval))))
634 (define-public (interval-center x)
635 "Center the number-pair @var{x}, if an interval."
636 (if (interval-empty? x)
638 (/ (+ (car x) (cdr x)) 2)))
640 (define-public interval-start car)
642 (define-public interval-end cdr)
644 (define (other-axis a)
645 (remainder (+ a 1) 2))
647 (define-public (interval-scale iv factor)
648 (cons (* (car iv) factor)
649 (* (cdr iv) factor)))
651 (define-public (interval-widen iv amount)
652 (cons (- (car iv) amount)
653 (+ (cdr iv) amount)))
655 (define-public (interval-empty? iv)
656 (> (car iv) (cdr iv)))
658 (define-public (interval-union i1 i2)
660 (min (car i1) (car i2))
661 (max (cdr i1) (cdr i2))))
663 (define-public (interval-intersection i1 i2)
665 (max (car i1) (car i2))
666 (min (cdr i1) (cdr i2))))
668 (define-public (interval-sane? i)
669 (not (or (nan? (car i))
673 (> (car i) (cdr i)))))
675 (define-public (add-point interval p)
676 (cons (min (interval-start interval) p)
677 (max (interval-end interval) p)))
679 (define-public (reverse-interval iv)
680 (cons (cdr iv) (car iv)))
682 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
688 (define (coord-operation operator operand coordinate)
690 (cons (operator (coord-x operand) (coord-x coordinate))
691 (operator (coord-y operand) (coord-y coordinate)))
692 (cons (operator operand (coord-x coordinate))
693 (operator operand (coord-y coordinate)))))
695 (define (coord-apply function coordinate)
698 ((coord-x function) (coord-x coordinate))
699 ((coord-y function) (coord-y coordinate)))
701 (function (coord-x coordinate))
702 (function (coord-y coordinate)))))
704 (define-public (coord-translate coordinate amount)
705 (coord-operation + amount coordinate))
707 (define-public (coord-scale coordinate amount)
708 (coord-operation * amount coordinate))
710 (define-public (coord-rotate coordinate degrees-in-radians)
714 (exact->inexact (coord-x coordinate))
715 (exact->inexact (coord-y coordinate))))
718 (+ (* (coord-x coordinate) (coord-x coordinate))
719 (* (coord-y coordinate) (coord-y coordinate)))))
720 (angle (angle-0-2pi (atan (coord-y coordinate) (coord-x coordinate)))))
722 (* radius (cos (+ angle degrees-in-radians)))
723 (* radius (sin (+ angle degrees-in-radians))))))
725 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
728 (define-public PI (* 4 (atan 1)))
730 (define-public TWO-PI (* 2 PI))
732 (define-public PI-OVER-TWO (/ PI 2))
734 (define-public THREE-PI-OVER-TWO (* 3 PI-OVER-TWO))
736 (define-public (cyclic-base-value value cycle)
737 "Take @var{value} and modulo-maps it between 0 and base @var{cycle}."
739 (cyclic-base-value (+ value cycle) cycle)
741 (cyclic-base-value (- value cycle) cycle)
744 (define-public (angle-0-2pi angle)
745 "Take @var{angle} (in radians) and maps it between 0 and 2pi."
746 (cyclic-base-value angle TWO-PI))
748 (define-public (angle-0-360 angle)
749 "Take @var{angle} (in degrees) and maps it between 0 and 360 degrees."
750 (cyclic-base-value angle 360.0))
752 (define-public PI-OVER-180 (/ PI 180))
754 (define-public (degrees->radians angle-degrees)
755 "Convert the given angle from degrees to radians."
756 (* angle-degrees PI-OVER-180))
758 (define-public (ellipse-radius x-radius y-radius angle)
760 (* x-radius y-radius)
762 (+ (* (expt y-radius 2)
763 (* (cos angle) (cos angle)))
765 (* (sin angle) (sin angle)))))))
767 (define-public (polar->rectangular radius angle-in-degrees)
768 "Return polar coordinates (@var{radius}, @var{angle-in-degrees})
769 as rectangular coordinates @ode{(x-length . y-length)}."
771 (let ((complex (make-polar
773 (degrees->radians angle-in-degrees))))
776 (imag-part complex))))
778 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
781 (define-public (string-endswith s suffix)
782 (equal? suffix (substring s
783 (max 0 (- (string-length s) (string-length suffix)))
786 (define-public (string-startswith s prefix)
787 (equal? prefix (substring s 0 (min (string-length s) (string-length prefix)))))
789 (define-public (string-encode-integer i)
792 ((< i 0) (string-append "n" (string-encode-integer (- i))))
794 (make-string 1 (integer->char (+ 65 (modulo i 26))))
795 (string-encode-integer (quotient i 26))))))
797 (define (number->octal-string x)
798 (let* ((n (inexact->exact x))
799 (n64 (quotient n 64))
800 (n8 (quotient (- n (* n64 64)) 8)))
804 (number->string (remainder (- n (+ (* n64 64) (* n8 8))) 8)))))
806 (define-public (ly:inexact->string x radix)
807 (let ((n (inexact->exact x)))
808 (number->string n radix)))
810 (define-public (ly:number-pair->string c)
811 (string-append (ly:number->string (car c)) " "
812 (ly:number->string (cdr c))))
814 (define-public (dir-basename file . rest)
815 "Strip suffixes in @var{rest}, but leave directory component for
817 (define (inverse-basename x y) (basename y x))
818 (simple-format #f "~a/~a" (dirname file)
819 (fold inverse-basename file rest)))
821 (define-public (write-me message x)
822 "Return @var{x}. Display @var{message} and write @var{x}.
823 Handy for debugging, possibly turned off."
824 (display message) (write x) (newline) x)
827 (define-public (stderr string . rest)
828 (apply format (current-error-port) string rest)
829 (force-output (current-error-port)))
831 (define-public (debugf string . rest)
833 (apply stderr string rest)))
835 (define (index-cell cell dir)
840 (define (cons-map f x)
841 "map F to contents of X"
842 (cons (f (car x)) (f (cdr x))))
844 (define-public (list-insert-separator lst between)
845 "Create new list, inserting @var{between} between elements of @var{lst}."
849 (cons x (cons between y))))
850 (fold-right conc #f lst))
852 (define-public (string-regexp-substitute a b str)
853 (regexp-substitute/global #f a str 'pre b 'post))
855 (define (regexp-split str regex)
857 (define end-of-prev-match 0)
858 (define (notice match)
860 (set! matches (cons (substring (match:string match)
864 (set! end-of-prev-match (match:end match)))
866 (regexp-substitute/global #f regex str notice 'post)
868 (if (< end-of-prev-match (string-length str))
871 (cons (substring str end-of-prev-match (string-length str)) matches)))
875 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
878 (define-public (number-format number-type num . custom-format)
879 "Print NUM accordingly to the requested NUMBER-TYPE.
880 Choices include @code{roman-lower} (by default),
881 @code{roman-upper}, @code{arabic} and @code{custom}.
882 In the latter case, CUSTOM-FORMAT must be supplied
883 and will be applied to NUM."
885 ((equal? number-type 'roman-lower)
886 (fancy-format #f "~(~@r~)" num))
887 ((equal? number-type 'roman-upper)
888 (fancy-format #f "~@r" num))
889 ((equal? number-type 'arabic)
890 (fancy-format #f "~d" num))
891 ((equal? number-type 'custom)
892 (fancy-format #f (car custom-format) num))
893 (else (fancy-format #f "~(~@r~)" num))))
903 (define-public (binary-search start end getter target-val)
904 (_i "Find the index between @var{start} and @var{end} (an integer)
905 which produces the closest match to @var{target-val} if
906 applied to function @var{getter}.")
909 (let* ((compare (quotient (+ start end) 2))
910 (get-val (getter compare)))
912 ((< target-val get-val)
913 (set! end (1- compare)))
914 ((< get-val target-val)
915 (set! start (1+ compare))))
916 (binary-search start end getter target-val))))
918 (define-public (car< a b)
921 (define-public (car<= a b)
922 (<= (car a) (car b)))
924 (define-public (symbol<? lst r)
925 (string<? (symbol->string lst) (symbol->string r)))
927 (define-public (symbol-key<? lst r)
928 (string<? (symbol->string (car lst)) (symbol->string (car r))))
930 (define-public (eval-carefully symbol module . default)
931 "Check whether all symbols in expr @var{symbol} are reachable
932 in module @var{module}. In that case evaluate, otherwise
933 print a warning and set an optional @var{default}."
934 (let* ((unavailable? (lambda (sym)
935 (not (module-defined? module sym))))
939 (filter symbol? (flatten-list symbol)))))
940 (if (null? sym-unavailable)
942 (let* ((def (and (pair? default) (car default))))
943 (ly:programming-error
944 "cannot evaluate ~S in module ~S, setting to ~S"
945 (object->string symbol)
946 (object->string module)
947 (object->string def))
950 (define (self-evaluating? x)
951 (or (number? x) (string? x) (procedure? x) (boolean? x)))
954 (any (lambda (p) ((car p) x)) lilypond-exported-predicates))
956 (define-public (pretty-printable? val)
957 (and (not (self-evaluating? val))
959 (not (hash-table? val))
960 (not (ly-type? val))))
962 (define-public (scm->string val)
963 (let* ((quote-style (if (string? val)
965 (if (or (null? val) ; (ly-type? '()) => #t
966 (and (not (self-evaluating? val))
968 (not (hash-table? val))
969 (not (ly-type? val))))
972 ; don't confuse users with #<procedure ...> syntax
973 (str (if (and (procedure? val)
974 (symbol? (procedure-name val)))
975 (symbol->string (procedure-name val))
976 (call-with-output-string
977 (if (pretty-printable? val)
978 ; property values in PDF hit margin after 64 columns
980 (pretty-print val port #:width (case quote-style
983 (lambda (port) (display val port)))))))
985 ((single) (string-append
987 (string-regexp-substitute "\n " "\n " str)))
988 ((double) (string-append "\"" str "\""))
991 (define-public (!= lst r)
994 (define-public lily-unit->bigpoint-factor
996 ((equal? (ly:unit) "mm") (/ 72.0 25.4))
997 ((equal? (ly:unit) "pt") (/ 72.0 72.27))
998 (else (ly:error (_ "unknown unit: ~S") (ly:unit)))))
1000 (define-public lily-unit->mm-factor
1001 (* 25.4 (/ lily-unit->bigpoint-factor 72)))
1003 ;;; FONT may be font smob, or pango font string...
1004 (define-public (font-name-style font)
1006 (string-downcase font)
1007 (let* ((font-name (ly:font-name font))
1008 (full-name (if font-name font-name (ly:font-file-name font))))
1009 (string-downcase full-name))))
1011 (define-public (modified-font-metric-font-scaling font)
1012 (let* ((designsize (ly:font-design-size font))
1013 (magnification (* (ly:font-magnification font)))
1014 (scaling (* magnification designsize)))
1015 (debugf "scaling:~S\n" scaling)
1016 (debugf "magnification:~S\n" magnification)
1017 (debugf "design:~S\n" designsize)
1020 (define-public (version-not-seen-message input-file-name)
1022 (ly:format "~a:1" input-file-name)
1023 (_ "no \\version statement found, please add~afor future compatibility")
1024 (format #f "\n\n\\version ~s\n\n" (lilypond-version))))