/usr/share/lilypond/2.18.2/scm/clip-region.scm is in lilypond-data 2.18.2-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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;;;;
;;;; Copyright (C) 2006--2012 Han-Wen Nienhuys <hanwen@lilypond.org>
;;;;
;;;; LilyPond is free software: you can redistribute it and/or modify
;;;; it under the terms of the GNU General Public License as published by
;;;; the Free Software Foundation, either version 3 of the License, or
;;;; (at your option) any later version.
;;;;
;;;; LilyPond is distributed in the hope that it will be useful,
;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;;; GNU General Public License for more details.
;;;;
;;;; You should have received a copy of the GNU General Public License
;;;; along with LilyPond. If not, see <http://www.gnu.org/licenses/>.
(define-module (scm clip-region))
(use-modules (lily))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;; The procedures shown in this list have been moved to
;; scm/output-lib.scm
;;
;;
;; (define-public (make-rhythmic-location bar-num num den)
;; (define-public (rhythmic-location? a)
;; (define-public (make-graceless-rhythmic-location loc)
;; (define-public rhythmic-location-measure-position cdr)
;; (define-public rhythmic-location-bar-number car)
;; (define-public (rhythmic-location<? a b)
;; (define-public (rhythmic-location<=? a b)
;; (define-public (rhythmic-location>=? a b)
;; (define-public (rhythmic-location>? a b)
;; (define-public (rhythmic-location=? a b)
;; (define-public (rhythmic-location->file-string a)
;; (define-public (rhythmic-location->string a)
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Actual clipping logic.
;;
;; the total of this will be
;; O(#systems * #regions)
;;
;; we can actually do better by sorting the regions as well,
;; but let's leave that for future extensions.
;;
(define-public (system-clipped-x-extent system-grob clip-region)
"Return the X-extent of @var{system-grob} when clipped with
@var{clip-region}. Return @code{#f} if not appropriate."
(let*
((region-start (car clip-region))
(columns (ly:grob-object system-grob 'columns))
(region-end (cdr clip-region))
(found-grace-end #f)
(candidate-columns
(filter
(lambda (j)
(let*
((column (ly:grob-array-ref columns j))
(loc (ly:grob-property column 'rhythmic-location))
(grace-less (make-graceless-rhythmic-location loc))
)
(and (rhythmic-location? loc)
(rhythmic-location<=? region-start loc)
(or (rhythmic-location<? grace-less region-end)
(and (rhythmic-location=? grace-less region-end)
(eq? #t (ly:grob-property column 'non-musical))
)))
))
(iota (ly:grob-array-length columns))))
(column-range
(if (>= 1 (length candidate-columns))
#f
(cons (car candidate-columns)
(car (last-pair candidate-columns)))))
(clipped-x-interval
(if column-range
(cons
(interval-start
(ly:grob-robust-relative-extent
(if (= 0 (car column-range))
system-grob
(ly:grob-array-ref columns (car column-range)))
system-grob X))
(interval-end
(ly:grob-robust-relative-extent
(if (= (1- (ly:grob-array-length columns)) (cdr column-range))
system-grob
(ly:grob-array-ref columns (cdr column-range)))
system-grob X)))
#f
)))
clipped-x-interval))
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