One fix in m21ToXML.py:parseFlatElements()

music21/_version.py

@@ -50,7 +50,7 @@
 '''
 from __future__ import annotations
 
-__version__ = '9.7.1'
+__version__ = '9.7.2a4'
 
 def get_version_tuple(vv):
     v = vv.split('.')

music21/base.py

@@ -27,7 +27,7 @@
 <class 'music21.base.Music21Object'>
 
 >>> music21.VERSION_STR
-'9.7.1'
+'9.7.2a4'
 
 Alternatively, after doing a complete import, these classes are available
 under the module "base":

music21/musicxml/m21ToXml.py

@@ -38,6 +38,7 @@
 from music21 import chord
 from music21 import common
 from music21.common.enums import AppendSpanners
+from music21.common.numberTools import opFrac
 from music21 import defaults
 from music21 import duration
 from music21 import dynamics
@@ -3277,7 +3278,9 @@ def parseFlatElements(
                         self.parseOneElement(obj, AppendSpanners.NORMAL)
 
             for n in notesForLater:
-                if n.isRest and n.style.hideObjectOnPrint and n.duration.type == 'inexpressible':
+                if (n.isRest
+                        and n.style.hideObjectOnPrint
+                        and n.duration.type in ('inexpressible', 'complex')):
                     # Prefer a gap in stream, to be filled with a <forward> tag by
                     # fill_gap_with_forward_tag() rather than raising exceptions
                     continue
@@ -3322,7 +3325,7 @@ def parseFlatElements(
         else:
             # if necessary, jump to end of the measure.
             if self.offsetInMeasure < firstPassEndOffsetInMeasure:
-                self.moveForward(firstPassEndOffsetInMeasure)
+                self.moveForward(opFrac(firstPassEndOffsetInMeasure - self.offsetInMeasure))
 
         self.currentVoiceId = None
 

music21/musicxml/test_m21ToXml.py

@@ -695,6 +695,27 @@ def test_instrumentDoesNotCreateForward(self):
         self.assertTrue(tree.findall('.//note'))
         self.assertFalse(tree.findall('.//forward'))
 
+    def test_complexHiddenRestDoesNotCrashButInsteadCreatesForward(self):
+        '''
+        Complex hidden rests were raising an exception.  Now they create a forward tag instead.
+        '''
+        complexRest = note.Rest()
+        complexRest.quarterLength = 5.0
+        complexRest.style.hideObjectOnPrint = True
+        n = note.Note()
+        n.quarterLength = 1.0
+        m = stream.Measure()
+        m.append(complexRest)
+        m.append(n)
+        p = stream.Part()
+        p.append(m)
+        s = stream.Score()
+        s.append(p)
+        tree = self.getET(s, makeNotation=False)
+        self.assertEqual(len(tree.findall('.//forward')), 1)
+        self.assertEqual(len(tree.findall('.//note')), 1)
+        self.assertEqual(len(tree.findall('.//rest')), 0)
+
     def testOutOfBoundsExpressionDoesNotCreateForward(self):
         '''
         A metronome mark at an offset exceeding the bar duration was causing