def testJoinPartStaffsAgain(self):
'''
Regression test for side effects on the stream passed to ScoreExporter
preventing it from being written out again.
'''
from music21 import corpus
from music21.musicxml.m21ToXml import ScoreExporter
b = corpus.parse('cpebach')
SX = ScoreExporter(b)
SX.parse()
SX.parse()
def testMultipleInstrumentsPiano(self):
ps1 = stream.PartStaff([
stream.Measure(
[instrument.ElectricPiano(),
note.Note(type='whole')]),
stream.Measure(
[instrument.ElectricOrgan(),
note.Note(type='whole')]),
stream.Measure([instrument.Piano(),
note.Note(type='whole')]),
])
ps2 = stream.PartStaff([
stream.Measure([instrument.Vocalist(),
note.Note(type='whole')]),
stream.Measure([note.Note(type='whole')]),
stream.Measure([note.Note(type='whole')]),
])
sg = layout.StaffGroup([ps1, ps2])
s = stream.Score([ps1, ps2, sg])
scEx = ScoreExporter(s)
tree = scEx.parse()
self.assertEqual(
[el.text for el in tree.findall('.//instrument-name')],
['Electric Piano', 'Voice', 'Electric Organ', 'Piano'])
self.assertEqual(len(tree.findall('.//measure/note/instrument')), 6)
def testFromScoreNoMeasures(self):
s = stream.Score()
s.append(note.Note())
scExporter = ScoreExporter(s)
tree = scExporter.parse()
# Measures should have been made
self.assertIsNotNone(tree.find('.//measure'))
def getET(self, obj):
from music21.musicxml.m21ToXml import ScoreExporter
SX = ScoreExporter(obj)
mxScore = SX.parse()
helpers.indent(mxScore)
return mxScore
def getET(self, obj):
'''
Return a <score-partwise> ElementTree.
Does NOT call makeNotation() like most calls to show() and write().
'''
SX = ScoreExporter(obj)
mxScore = SX.parse()
helpers.indent(mxScore)
return mxScore
def testMidiInstrumentNoName(self):
i = instrument.Instrument()
i.midiProgram = 42
s = converter.parse('tinyNotation: c1')
s.measure(1).insert(i)
sc = stream.Score(s)
scExporter = ScoreExporter(sc)
tree = scExporter.parse()
mxScoreInstrument = tree.findall('.//score-instrument')[0]
mxMidiInstrument = tree.findall('.//midi-instrument')[0]
self.assertEqual(mxScoreInstrument.get('id'),
mxMidiInstrument.get('id'))
def testSimple(self):
# b = converter.parse(corpus.corpora.CoreCorpus().getWorkList('cpebach')[0],
# format='musicxml', forceSource=True)
b = corpus.parse('cpebach')
# b.show('text')
# n = b[note.NotRest].first()
# print(n.expressions)
# return
SX = ScoreExporter(b)
mxScore = SX.parse()
helpers.indent(mxScore)
sio = io.BytesIO()
sio.write(SX.xmlHeader())
et = ElementTree(mxScore)
et.write(sio, encoding='utf-8', xml_declaration=False)
v = sio.getvalue()
sio.close()
v = v.decode('utf-8')
# v = v.replace(' />', '/>') # normalize
# b2 = converter.parse(v)
fp = b.write('musicxml')
if self.show:
print(fp)
with io.open(fp, encoding='utf-8') as f:
v2 = f.read()
differ = list(difflib.ndiff(v.splitlines(), v2.splitlines()))
for i, l in enumerate(differ):
if l.startswith('-') or l.startswith('?') or l.startswith('+'):
if 'id=' in l:
continue
if self.show:
print(l)
# for j in range(i - 1,i + 1):
# print(differ[j])
# print('------------------')
import os
os.remove(fp)
def testMultipleInstruments(self):
'''
This is a score for two woodwind players both doubling on
flute and oboe. They both switch to flute and then back to oboe.
There are six m21 instruments to represent this, but the
<score-instrument> tags need just four, since no
musicXML <part> needs two oboes in it, etc., unless
there is a patch change/MIDI instrument change.
'''
p1 = stream.Part([
stream.Measure([instrument.Oboe(),
note.Note(type='whole')]),
stream.Measure([instrument.Flute(),
note.Note(type='whole')]),
stream.Measure([instrument.Oboe(),
note.Note(type='whole')]),
])
p2 = stream.Part([
stream.Measure([instrument.Oboe(),
note.Note(type='whole')]),
stream.Measure([instrument.Flute(),
note.Note(type='whole')]),
stream.Measure([instrument.Oboe(),
note.Note(type='whole')]),
])
s = stream.Score([p1, p2])
scEx = ScoreExporter(s)
tree = scEx.parse()
self.assertEqual(len(tree.findall('.//score-instrument')), 4)
self.assertEqual(len(tree.findall('.//measure/note/instrument')), 6)
self.assertEqual(
tree.find('.//score-instrument').get('id'),
tree.find('.//measure/note/instrument').get('id'))
self.assertNotEqual(
tree.find('.//score-instrument').get('id'),
tree.findall('.//measure/note/instrument')[-1].get('id'))
