X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=scm%2Fpart-combiner.scm;fp=scm%2Fpart-combiner.scm;h=0e72ebe2a057eef1f4284e9c4d69fa3c4e20ee94;hb=941dff9d2a67080e0dd8474f1e70f0c72ace6424;hp=81beaf6ae7d83c6dab583c1297dcd061fe775f3c;hpb=5a22d6233a39d3164e1ca043244794c268be4ad0;p=lilypond.git

diff --git a/scm/part-combiner.scm b/scm/part-combiner.scm
index 81beaf6ae7..0e72ebe2a0 100644
--- a/scm/part-combiner.scm
+++ b/scm/part-combiner.scm
@@ -1,8 +1,19 @@
-;;;; part-combiner.scm -- Part combining, staff changes.
+;;;; This file is part of LilyPond, the GNU music typesetter.
 ;;;;
-;;;;  source file of the GNU LilyPond music typesetter
-;;;; 
-;;;; (c) 2004--2009	Han-Wen Nienhuys <hanwen@xs4all.nl>
+;;;; 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/>.
 
 ;; todo: figure out how to make module,
 ;; without breaking nested ly scopes
@@ -19,7 +30,7 @@
   ;; of (SYMBOL . RESULT-INDEX), which indicates where
   ;; said spanner was started.
   (spanner-state #:init-value '() #:accessor span-state))
-  
+
 (define-method (write (x <Voice-state> ) file)
   (display (when x) file)
   (display " evs = " file)
@@ -43,13 +54,16 @@
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 
 (define-class <Split-state> ()
+  ;; The automatically determined split configuration
   (configuration #:init-value '() #:accessor configuration)
+  ;; Allow overriding split configuration, takes precedence over configuration
+  (forced-configuration #:init-value #f #:accessor forced-configuration)
   (when-moment #:accessor when #:init-keyword #:when)
   ;; voice-states are states starting with the Split-state or later
   ;;
   (is #:init-keyword #:voice-states #:accessor voice-states)
   (synced  #:init-keyword #:synced #:init-value	 #f #:getter synced?))
-			     
+
 
 (define-method (write (x <Split-state> ) f)
   (display (when x) f)
@@ -82,7 +96,7 @@
   "Merge lists VS1 and VS2, containing Voice-state objects into vector
 of Split-state objects, crosslinking the Split-state vector and
 Voice-state objects
-"  
+"
   (define (helper ss-idx ss-list idx1 idx2)
     (let* ((state1 (if (< idx1 (vector-length vs1)) (vector-ref vs1 idx1) #f))
 	   (state2 (if (< idx2 (vector-length vs2)) (vector-ref vs2 idx2) #f))
@@ -114,13 +128,13 @@ Voice-state objects
 
   (define (helper index active)
     "Analyse EVS at INDEX, given state ACTIVE."
-    
+
     (define (analyse-tie-start active ev)
       (if (equal? (ly:event-property ev 'class) 'tie-event)
 	  (acons 'tie (split-index (vector-ref voice-state-vec index))
 		 active)
 	  active))
-    
+
     (define (analyse-tie-end active ev)
       (if (equal? (ly:event-property ev 'class) 'note-event)
 	  (assoc-remove! active 'tie)
@@ -132,12 +146,12 @@ Voice-state objects
 		   (equal? STOP (ly:event-property ev 'span-direction))))
 	  (assoc-remove! (assoc-remove! active 'cresc) 'decr)
 	  active))
-    
+
     (define (active<? a b)
       (cond ((symbol<? (car a) (car b)) #t)
 	    ((symbol<? (car b) (car b)) #f)
 	    (else (< (cdr a) (cdr b)))))
-    
+
     (define (analyse-span-event active ev)
       (let* ((name (ly:event-property ev 'class))
 	     (key (cond ((equal? name 'slur-event) 'slur)
@@ -181,41 +195,50 @@ Voice-state objects
 	  (set! (span-state (vector-ref voice-state-vec index))
 		(list-copy active))
 	  (helper (1+ index) active))))
-  
+
   (helper 0 '()))
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-(define-public (recording-group-emulate music odef) 
-  "Interprets music according to odef, but stores all events in a chronological list, similar to the Recording_group_engraver in 2.8 and earlier"
+(define-public (recording-group-emulate music odef)
+  "Interpret @var{music} according to @var{odef}, but store all events
+in a chronological list, similar to the @code{Recording_group_engraver} in
+LilyPond version 2.8 and earlier."
   (let*
-      ((context-list '())
-       (now-mom (ly:make-moment 0 0))
-       (global (ly:make-global-context odef))
-       (mom-listener (ly:make-listener 
-		      (lambda (tev)
-			(set! now-mom (ly:event-property tev 'moment)))))
-       (new-context-listener
-	(ly:make-listener
-	 (lambda (sev)
-	     (let*
-		 ((child (ly:event-property sev 'context))
-		  (this-moment-list
-		   (cons (ly:context-id child) '()))
-		  (dummy
-		   (set! context-list (cons this-moment-list context-list)))
-		  (acc '())
-		  (accumulate-event-listener
-		   (ly:make-listener (lambda (ev)
-				       (set! acc (cons (cons ev #t) acc)))))
-		  (save-acc-listener (ly:make-listener (lambda (tev)
-							 (if (pair? acc)
-							     (let ((this-moment (cons (cons now-mom (ly:context-property child 'instrumentTransposition))
-										      acc)))
-							       (set-cdr! this-moment-list (cons this-moment (cdr this-moment-list)))
-							       (set! acc '())))))))
-	       (ly:add-listener accumulate-event-listener (ly:context-event-source child) 'music-event)
-	       (ly:add-listener save-acc-listener (ly:context-event-source global) 'OneTimeStep))))))
-    (ly:add-listener new-context-listener (ly:context-events-below global) 'AnnounceNewContext)
+     ((context-list '())
+      (now-mom (ly:make-moment 0 0))
+      (global (ly:make-global-context odef))
+      (mom-listener (ly:make-listener
+             (lambda (tev) (set! now-mom (ly:event-property tev 'moment)))))
+      (new-context-listener
+       (ly:make-listener
+        (lambda (sev)
+          (let*
+             ((child (ly:event-property sev 'context))
+              (this-moment-list (cons (ly:context-id child) '()))
+              (dummy (set! context-list (cons this-moment-list context-list)))
+              (acc '())
+              (accumulate-event-listener
+                  (ly:make-listener (lambda (ev)
+                                       (set! acc (cons (cons ev #t) acc)))))
+              (save-acc-listener
+                  (ly:make-listener (lambda (tev)
+                      (if (pair? acc)
+                        (let ((this-moment
+                              (cons (cons now-mom
+                                (ly:context-property child 'instrumentTransposition))
+                                ;; The accumulate-event-listener above creates
+                                ;; the list of events in reverse order, so we
+                                ;; have to revert it to the original order again
+                                (reverse acc))))
+                          (set-cdr! this-moment-list
+                                (cons this-moment (cdr this-moment-list)))
+                          (set! acc '())))))))
+            (ly:add-listener accumulate-event-listener
+                (ly:context-event-source child) 'StreamEvent)
+            (ly:add-listener save-acc-listener
+                (ly:context-event-source global) 'OneTimeStep))))))
+    (ly:add-listener new-context-listener
+        (ly:context-events-below global) 'AnnounceNewContext)
     (ly:add-listener mom-listener (ly:context-event-source global) 'Prepare)
     (ly:interpret-music-expression (make-non-relative-music music) global)
     context-list))
@@ -227,23 +250,73 @@ Voice-state objects
 	 (listener (ly:parser-lookup parser 'partCombineListener))
 	 (evs2 (recording-group-emulate m2 listener))
 	 (evs1 (recording-group-emulate m1 listener)))
-    
+
     (set! (ly:music-property m 'elements) (list m1 m2))
     (set! (ly:music-property m 'split-list)
-      (if (and (assoc "one" evs1) (assoc "two" evs2))
-  	  (determine-split-list (reverse! (cdr (assoc "one" evs1)) '())
-	  			(reverse! (cdr (assoc "two" evs2)) '()))
-	  '() ))
+	  (if (and (assoc "one" evs1) (assoc "two" evs2))
+	      (determine-split-list (reverse! (assoc-get "one" evs1) '())
+				    (reverse! (assoc-get "two" evs2) '()))
+	      '()))
     m))
 
 (define-public (determine-split-list evl1 evl2)
-  "EVL1 and EVL2 should be ascending"
+  "@var{evl1} and @var{evl2} should be ascending."
   (let* ((pc-debug #f)
 	 (chord-threshold 8)
 	 (voice-state-vec1 (make-voice-states evl1))
 	 (voice-state-vec2 (make-voice-states evl2))
 	 (result (make-split-state voice-state-vec1 voice-state-vec2)))
-    
+
+    ;; Go through all moments recursively and check if the events of that
+    ;; moment contain a part-combine-force-event override. If so, store its
+    ;; value in the forced-configuration field, which will override. The
+    ;; previous configuration is used to determine non-terminated settings.
+    (define (analyse-forced-combine result-idx prev-res)
+
+      (define (get-forced-event x)
+	(if (ly:in-event-class? x 'part-combine-force-event)
+	    (cons (ly:event-property x 'forced-type) (ly:event-property x 'once))
+	    #f))
+      (define (part-combine-events vs)
+	(if (not vs)
+	    '()
+	    (filter-map get-forced-event (events vs))))
+      ;; end part-combine-events
+
+      ;; forced-result: Take the previous config and analyse whether
+      ;; any change happened.... Return new once and permanent config
+      (define (forced-result evt state)
+	;; sanity check, evt should always be (new-state . once)
+	(if (not (and (pair? evt) (pair? state)))
+	    state
+	    (if (cdr evt)
+		;; Once-event, leave permanent state unchanged
+		(cons (car evt) (cdr state))
+		;; permanent change, leave once state unchanged
+		(cons (car state) (car evt)))))
+      ;; end forced-combine-result
+
+      ;; body of analyse-forced-combine:
+      (if (< result-idx (vector-length result))
+	  (let* ((now-state (vector-ref result result-idx)) ; current result
+		 ;; Extract all part-combine force events
+		 (ev1 (part-combine-events (car (voice-states now-state))))
+		 (ev2 (part-combine-events (cdr (voice-states now-state))))
+		 (evts (append ev1 ev2))
+		 ;; result is (once-state permament-state):
+		 (state (fold forced-result (cons 'automatic prev-res) evts))
+		 ;; Now let once override permanent changes:
+		 (force-state (if (equal? (car state) 'automatic)
+				  (cdr state)
+				  (car state))))
+	    (set! (forced-configuration (vector-ref result result-idx))
+		  force-state)
+	    ;; For the next moment, ignore the once override (car stat)
+	    ;; and pass on the permanent override, stored as (cdr state)
+	    (analyse-forced-combine (1+ result-idx) (cdr state)))))
+    ;; end analyse-forced-combine
+
+
     (define (analyse-time-step result-idx)
       (define (put x . index)
 	"Put the result to X, starting from INDEX backwards.
@@ -256,7 +329,7 @@ Only set if not set previously.
 	      (begin
 		(set! (configuration (vector-ref result i)) x)
 		(put x (1- i))))))
-      
+
       (define (copy-state-from state-vec vs)
 	(define (copy-one-state key-idx)
 	  (let* ((idx (cdr key-idx))
@@ -314,12 +387,12 @@ Only set if not set previously.
 						(previous-voice-state vs2)))
 			   (if (and (null? (span-state vs1)) (null? (span-state vs2)))
 			       (put 'chords)))))))))
-      
+
       (if (< result-idx (vector-length result))
 	  (let* ((now-state (vector-ref result result-idx))
 		 (vs1 (car (voice-states now-state)))
 		 (vs2 (cdr (voice-states now-state))))
-	    
+
 	    (cond ((not vs1) (put 'apart))
 		  ((not vs2) (put 'apart))
 		  (else
@@ -336,13 +409,13 @@ Only set if not set previously.
 			      (equal? active1 active2)
 			      (equal? new-active1 new-active2))
 			 (analyse-notes now-state)
-			 
+
 			 ;; active states different:
 			 (put 'apart)))
-		   
+
 		   ;; go to the next one, if it exists.
 		   (analyse-time-step (1+ result-idx)))))))
-    
+
     (define (analyse-a2 result-idx)
       (if (< result-idx (vector-length result))
 	  (let* ((now-state (vector-ref result result-idx))
@@ -350,7 +423,7 @@ Only set if not set previously.
 		 (vs2 (cdr (voice-states now-state))))
 	    (if (and (equal? (configuration now-state) 'chords)
 		     vs1 vs2)
-		(let ((notes1 (note-events vs1)) 
+		(let ((notes1 (note-events vs1))
 		      (notes2 (note-events vs2)))
 		  (cond ((and (= 1 (length notes1))
 			      (= 1 (length notes2))
@@ -361,9 +434,9 @@ Only set if not set previously.
 			      (= 0 (length notes2)))
 			 (set! (configuration now-state) 'unisilence)))))
 	    (analyse-a2 (1+ result-idx)))))
-    
+
     (define (analyse-solo12 result-idx)
-      
+
       (define (previous-config vs)
 	(let* ((pvs (previous-voice-state vs))
 	       (spi (if pvs (split-index pvs) #f))
@@ -371,26 +444,26 @@ Only set if not set previously.
 	  (if prev-split
 	      (configuration prev-split)
 	      'apart)))
-      
+
       (define (put-range x a b)
 	;; (display (list "put range "	x a b "\n"))
 	(do ((i a (1+ i)))
 	    ((> i b) b)
 	  (set! (configuration (vector-ref result i)) x)))
-      
+
       (define (put x)
 	;; (display (list "putting "  x "\n"))
 	(set! (configuration (vector-ref result result-idx)) x))
-      
+
       (define (current-voice-state now-state voice-num)
 	(define vs ((if (= 1 voice-num) car cdr)
 		    (voice-states now-state)))
 	(if (or (not vs) (equal? (when now-state) (when vs)))
 	    vs
 	    (previous-voice-state vs)))
-      
+
       (define (try-solo type start-idx current-idx)
-	"Find a maximum stretch that can be marked as solo. Only set
+	"Find a maximum stretch that can be marked as solo.  Only set
 the mark when there are no spanners active.
 
       return next idx to analyse.
@@ -414,7 +487,7 @@ the mark when there are no spanners active.
 		     ;;
 		     ;; This includes rests. This isn't a problem: long rests
 		     ;; will be shared with the silent voice, and be marked
-		     ;; as unisilence. Therefore, long rests won't 
+		     ;; as unisilence. Therefore, long rests won't
 		     ;;	 accidentally be part of a solo.
 		     ;;
 		     (put-range type start-idx current-idx)
@@ -423,9 +496,9 @@ the mark when there are no spanners active.
 		     (try-solo type start-idx (1+ current-idx)))))
 	    ;; try-solo
 	    start-idx))
-      
+
       (define (analyse-moment result-idx)
-	"Analyse 'apart starting at RESULT-IDX. Return next index. "
+	"Analyse 'apart starting at RESULT-IDX.  Return next index."
 	(let* ((now-state (vector-ref result result-idx))
 	       (vs1 (current-voice-state now-state 1))
 	       (vs2 (current-voice-state now-state 2))
@@ -449,11 +522,11 @@ the mark when there are no spanners active.
 		       (equal? (when vs2) (when now-state))
 		       (null? (previous-span-state vs2)))
 		  (try-solo 'solo2 result-idx result-idx))
-		 
+
 		 (else (1+ result-idx)))
 	   ;; analyse-moment
 	   (1+ result-idx))))
-      
+
       (if (< result-idx (vector-length result))
 	  (if (equal? (configuration (vector-ref result result-idx)) 'apart)
 	      (analyse-solo12 (analyse-moment result-idx))
@@ -469,14 +542,25 @@ the mark when there are no spanners active.
 	  (display "***\n")
 	  (display result)
 	  (display "***\n")))
+
+    ;; Extract all forced combine strategies, i.e. events inserted by
+    ;; \partcombine(Apart|Automatic|SoloI|SoloII|Chords)[Once]
+    ;; They will in the end override the automaically determined ones.
+    ;; Initial state for both voices is no override
+    (analyse-forced-combine 0 #f)
+    ;; Now go through all time steps in a loop and find a combination strategy
+    ;; based only on the events of that one moment (i.e. neglecting longer
+    ;; periods of solo/apart, etc.)
     (analyse-time-step 0)
     ;; (display result)
+    ;; Check for unisono or unisilence moments
     (analyse-a2 0)
     ;;(display result)
     (analyse-solo12 0)
     ;; (display result)
     (set! result (map
-		  (lambda (x) (cons (when x) (configuration x)))
+		  ;; forced-configuration overrides, if it is set
+		  (lambda (x) (cons (when x) (or (forced-configuration x) (configuration x))))
 		  (vector->list result)))
     (if #f ;; pc-debug
 	 (display result))