/usr/share/lilypond/2.14.2/scm/chord-entry.scm is in lilypond-data 2.14.2-4.
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) 2004--2011 Han-Wen Nienhuys <hanwen@xs4all.nl>
;;;;
;;;; 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-public (construct-chord-elements root duration modifications)
"Build a chord on root using modifiers in @var{modifications}.
@code{NoteEvents} have duration @var{duration}.
Notes: Natural 11 is left from chord if not explicitly specified.
Entry point for the parser."
(let* ((flat-mods (flatten-list modifications))
(base-chord (stack-thirds (ly:make-pitch 0 4 0) the-canonical-chord))
(complete-chord '())
(bass #f)
(inversion #f)
(lead-mod #f)
(explicit-11 #f)
(start-additions #t))
(define (interpret-inversion chord mods)
"Read /FOO part. Side effect: INVERSION is set."
(if (and (> (length mods) 1) (eq? (car mods) 'chord-slash))
(begin
(set! inversion (cadr mods))
(set! mods (cddr mods))))
(interpret-bass chord mods))
(define (interpret-bass chord mods)
"Read /+FOO part. Side effect: BASS is set."
(if (and (> (length mods) 1) (eq? (car mods) 'chord-bass))
(begin
(set! bass (cadr mods))
(set! mods (cddr mods))))
(if (pair? mods)
(ly:warning (_ "Spurious garbage following chord: ~A") mods))
chord)
(define (interpret-removals chord mods)
(define (inner-interpret chord mods)
(if (and (pair? mods) (ly:pitch? (car mods)))
(inner-interpret (remove-step (+ 1 (ly:pitch-steps (car mods))) chord)
(cdr mods))
(interpret-inversion chord mods)))
(if (and (pair? mods) (eq? (car mods) 'chord-caret))
(inner-interpret chord (cdr mods))
(interpret-inversion chord mods)))
(define (interpret-additions chord mods)
"Interpret additions. TODO: should restrict modifier use?"
(cond ((null? mods) chord)
((ly:pitch? (car mods))
(if (= (pitch-step (car mods)) 11)
(set! explicit-11 #t))
(interpret-additions (cons (car mods) (remove-step (pitch-step (car mods)) chord))
(cdr mods)))
((procedure? (car mods))
(interpret-additions ((car mods) chord)
(cdr mods)))
(else (interpret-removals chord mods))))
(define (pitch-octavated-strictly-below p root)
"return P, but octavated, so it is below ROOT"
(ly:make-pitch (+ (ly:pitch-octave root)
(if (> (ly:pitch-notename root)
(ly:pitch-notename p))
0 -1))
(ly:pitch-notename p)
(ly:pitch-alteration p)))
(define (process-inversion complete-chord)
"Take out inversion from COMPLETE-CHORD, and put it at the bottom.
Return (INVERSION . REST-OF-CHORD).
Side effect: put original pitch in INVERSION.
If INVERSION is not in COMPLETE-CHORD, it will be set as a BASS, overriding
the bass specified.
"
(let* ((root (car complete-chord))
(inv? (lambda (y)
(and (= (ly:pitch-notename y)
(ly:pitch-notename inversion))
(= (ly:pitch-alteration y)
(ly:pitch-alteration inversion)))))
(rest-of-chord (remove inv? complete-chord))
(inversion-candidates (filter inv? complete-chord))
(down-inversion (pitch-octavated-strictly-below inversion root)))
(if (pair? inversion-candidates)
(set! inversion (car inversion-candidates))
(begin
(set! bass inversion)
(set! inversion #f)))
(if inversion
(cons down-inversion rest-of-chord)
rest-of-chord)))
;; root is always one octave too low.
;; something weird happens when this is removed,
;; every other chord is octavated. --hwn... hmmm.
(set! root (ly:pitch-transpose root (ly:make-pitch 1 0 0)))
;; skip the leading : , we need some of the stuff following it.
(if (pair? flat-mods)
(if (eq? (car flat-mods) 'chord-colon)
(set! flat-mods (cdr flat-mods))
(set! start-additions #f)))
;; remember modifier
(if (and (pair? flat-mods) (procedure? (car flat-mods)))
(begin
(set! lead-mod (car flat-mods))
(set! flat-mods (cdr flat-mods))))
;; extract first number if present, and build pitch list.
(if (and (pair? flat-mods)
(ly:pitch? (car flat-mods))
(not (eq? lead-mod sus-modifier)))
(begin
(if (= (pitch-step (car flat-mods)) 11)
(set! explicit-11 #t))
(set! base-chord
(stack-thirds (car flat-mods) the-canonical-chord))
(set! flat-mods (cdr flat-mods))))
;; apply modifier
(if (procedure? lead-mod)
(set! base-chord (lead-mod base-chord)))
(set! complete-chord
(if start-additions
(interpret-additions base-chord flat-mods)
(interpret-removals base-chord flat-mods)))
(set! complete-chord (sort complete-chord ly:pitch<?))
;; If natural 11 + natural 3 is present, but not given explicitly,
;; we remove the 11.
(if (and (not explicit-11)
(get-step 11 complete-chord)
(get-step 3 complete-chord)
(= 0 (ly:pitch-alteration (get-step 11 complete-chord)))
(= 0 (ly:pitch-alteration (get-step 3 complete-chord))))
(set! complete-chord (remove-step 11 complete-chord)))
;; must do before processing inversion/bass, since they are
;; not relative to the root.
(set! complete-chord (map (lambda (x) (ly:pitch-transpose x root))
complete-chord))
(if inversion
(set! complete-chord (process-inversion complete-chord)))
(if bass
(set! bass (pitch-octavated-strictly-below bass root)))
(if #f
(begin
(write-me "\n*******\n" flat-mods)
(write-me "root: " root)
(write-me "base chord: " base-chord)
(write-me "complete chord: " complete-chord)
(write-me "inversion: " inversion)
(write-me "bass: " bass)))
(if inversion
(make-chord-elements (cdr complete-chord) bass duration (car complete-chord)
inversion)
(make-chord-elements complete-chord bass duration #f #f))))
(define (make-chord-elements pitches bass duration inversion original-inv-pitch)
"Make EventChord with notes corresponding to PITCHES, BASS and
DURATION, and INVERSION."
(define (make-note-ev pitch)
(make-music 'NoteEvent
'duration duration
'pitch pitch))
(let ((nots (map make-note-ev pitches))
(bass-note (if bass (make-note-ev bass) #f))
(inv-note (if inversion (make-note-ev inversion) #f)))
(if bass-note
(begin
(set! (ly:music-property bass-note 'bass) #t)
(set! nots (cons bass-note nots))))
(if inv-note
(begin
(set! (ly:music-property inv-note 'inversion) #t)
(set! (ly:music-property inv-note 'octavation)
(- (ly:pitch-octave inversion)
(ly:pitch-octave original-inv-pitch)))
(set! nots (cons inv-note nots))))
nots))
;;;;;;;;;;;;;;;;
; chord modifiers change the pitch list.
(define (aug-modifier pitches)
(set! pitches (replace-step (ly:make-pitch 0 4 SHARP) pitches))
(replace-step (ly:make-pitch 0 2 0) pitches))
(define (minor-modifier pitches)
(replace-step (ly:make-pitch 0 2 FLAT) pitches))
(define (maj7-modifier pitches)
(set! pitches (remove-step 7 pitches))
(cons (ly:make-pitch 0 6 0) pitches))
(define (dim-modifier pitches)
(set! pitches (replace-step (ly:make-pitch 0 2 FLAT) pitches))
(set! pitches (replace-step (ly:make-pitch 0 4 FLAT) pitches))
(set! pitches (replace-step (ly:make-pitch 0 6 DOUBLE-FLAT) pitches))
pitches)
(define (sus-modifier pitches)
(remove-step (pitch-step (ly:make-pitch 0 2 0)) pitches))
(define-safe-public default-chord-modifier-list
`((m . ,minor-modifier)
(min . ,minor-modifier)
(aug . , aug-modifier)
(dim . , dim-modifier)
(maj . , maj7-modifier)
(sus . , sus-modifier)))
;; canonical 13 chord.
(define the-canonical-chord
(map (lambda (n)
(define (nca x)
(if (= x 7) FLAT 0))
(if (>= n 8)
(ly:make-pitch 1 (- n 8) (nca n))
(ly:make-pitch 0 (- n 1) (nca n))))
'(1 3 5 7 9 11 13)))
(define (stack-thirds upper-step base)
"Stack thirds listed in BASE until we reach UPPER-STEP. Add
UPPER-STEP separately."
(cond ((null? base) '())
((> (ly:pitch-steps upper-step) (ly:pitch-steps (car base)))
(cons (car base) (stack-thirds upper-step (cdr base))))
((<= (ly:pitch-steps upper-step) (ly:pitch-steps (car base)))
(list upper-step))
(else '())))
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