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Adding checks if music21 is installed

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Music21 is optional dependency
This commit is contained in:
Miika Alonen
2023-03-18 00:01:48 +02:00
parent 5d122a90e0
commit f0b9de0118
1 changed files with 45 additions and 33 deletions
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78
ziffers/converters.py
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@ -1,10 +1,18 @@
"""Collection of converters"""
from music21 import converter, note, stream, meter, chord, environment
from ziffers import zparse, Ziffers, Pitch, Rest, Chord
try:
from music21 import converter, note, stream, meter, chord, environment
music21_imported: bool = True
except ImportError:
music21_imported: bool = False
def to_music21(expression: str | Ziffers, **options):
"""Helper for passing options to the parser"""
if not music21_imported:
raise ImportError("Install Music21 library")
converter.registerSubconverter(ZiffersMusic21)
if isinstance(expression, Ziffers):
@ -32,40 +40,44 @@ def set_musescore_path(path: str):
settings["musescoreDirectPNGPath"] = path
class ZiffersMusic21(converter.subConverters.SubConverter):
"""Ziffers converter to Music21"""
if music21_imported:
registerFormats = ("ziffers",)
registerInputExtensions = ("zf",)
# pylint: disable=locally-disabled, invalid-name, unused-argument, attribute-defined-outside-init
class ZiffersMusic21(converter.subConverters.SubConverter):
"""Ziffers converter to Music21"""
def parseData(self, dataString, number=None):
"""Parses Ziffers string to Music21 object"""
# Look for options in keywords object
keywords = self.keywords["keywords"]
if "ziffers" in keywords:
options = keywords["ziffers"]
if "preparsed" in options:
parsed = options["preparsed"]
registerFormats = ("ziffers",)
registerInputExtensions = ("zf",)
def parseData(self, dataString, number=None):
"""Parses Ziffers string to Music21 object"""
# Look for options in keywords object
keywords = self.keywords["keywords"]
if "ziffers" in keywords:
options = keywords["ziffers"]
if "preparsed" in options:
parsed = options["preparsed"]
else:
parsed = zparse(dataString, **options)
else:
parsed = zparse(dataString, **options)
else:
parsed = zparse(dataString)
parsed = zparse(dataString)
note_stream = stream.Part()
if "time" in options:
m_item = meter.TimeSignature(options["time"]) # Common time
else:
m_item = meter.TimeSignature("c") # Common time
note_stream = stream.Part()
if "time" in options:
m_item = meter.TimeSignature(options["time"]) # Common time
else:
m_item = meter.TimeSignature("c") # Common time
note_stream.insert(0, m_item)
for item in parsed:
if isinstance(item, Pitch):
m_item = note.Note(item.note)
m_item.duration.quarterLength = item.duration * 4
elif isinstance(item, Rest):
m_item = note.Rest(item.duration * 4)
elif isinstance(item, Chord):
m_item = chord.Chord(item.notes)
m_item.duration.quarterLength = item.duration * 4
note_stream.append(m_item)
self.stream = note_stream.makeMeasures()
note_stream.insert(0, m_item)
for item in parsed:
if isinstance(item, Pitch):
m_item = note.Note(item.note)
m_item.duration.quarterLength = item.duration * 4
elif isinstance(item, Rest):
m_item = note.Rest(item.duration * 4)
elif isinstance(item, Chord):
m_item = chord.Chord(item.notes)
m_item.duration.quarterLength = item.duration * 4
note_stream.append(m_item)
# TODO: Is this ok?
self.stream = note_stream.makeMeasures()