def set_note(self, name='C', octave=4, dynamics={}):
"""Set the note to name in octave with dynamics.
Return the objects if it succeeded, raise an NoteFormatError
otherwise.
"""
dash_index = name.split('-')
if len(dash_index) == 1:
if notes.is_valid_note(name):
self.name = name
self.octave = octave
self.dynamics = dynamics
return self
else:
raise NoteFormatError("The string '%s' is not a valid "
"representation of a note in mingus" %
name)
elif len(dash_index) == 2:
if notes.is_valid_note(dash_index[0]):
self.name = dash_index[0]
self.octave = int(dash_index[1])
self.dynamics = dynamics
return self
else:
raise NoteFormatError("The string '%s' is not a valid "
"representation of a note in mingus" %
name)
return False
def get_notes(key='C'):
"""Return an ordered list of the notes in this natural key.
Examples:
>>> get_notes('F')
['F', 'G', 'A', 'Bb', 'C', 'D', 'E']
>>> get_notes('c')
['C', 'D', 'Eb', 'F', 'G', 'Ab', 'Bb']
"""
if _key_cache.has_key(key):
return _key_cache[key]
if not is_valid_key(key):
raise NoteFormatError("unrecognized format for key '%s'" % key)
result = []
# Calculate notes
altered_notes = map(operator.itemgetter(0),
get_key_signature_accidentals(key))
if get_key_signature(key) < 0:
symbol = 'b'
elif get_key_signature(key) > 0:
symbol = '#'
raw_tonic_index = base_scale.index(key.upper()[0])
for note in islice(cycle(base_scale), raw_tonic_index, raw_tonic_index+7):
if note in altered_notes:
result.append('%s%s' % (note, symbol))
else:
result.append(note)
# Save result to cache
_key_cache[key] = result
return result
def relative_minor(key):
"""Return the relative minor of a major key.
Example:
>>> relative_minor('C')
'a'
"""
for couple in keys:
if key == couple[0]:
return couple[1]
raise NoteFormatError("'%s' is not a major key" % key)
def get_key_signature(key='C'):
"""Return the key signature.
0 for C or a, negative numbers for flat key signatures, positive numbers
for sharp key signatures.
"""
if not is_valid_key(key):
raise NoteFormatError("unrecognized format for key '%s'" % key)
for couple in keys:
if key in couple:
accidentals = keys.index(couple) - 7
return accidentals
def __init__(self, name='C', octave=4, dynamics={}):
if type(name) == str:
self.set_note(name, octave, dynamics)
elif hasattr(name, 'name'):
# Hardcopy Note object
self.set_note(name.name, name.octave, name.dynamics)
if hasattr(name, 'channel'):
self.channel = name.channel
if hasattr(name, 'velocity'):
self.velocity = name.velocity
elif type(name) == int:
self.from_int(name)
else:
raise NoteFormatError("Don't know what to do with name object: "
"'%s'" % name)
def note_to_int(note):
"""Convert notes in the form of C, C#, Cb, C##, etc. to an integer in the
range of 0-11.
Throw a NoteFormatError exception if the note format is not recognised.
"""
if is_valid_note(note):
val = _note_dict[note[0]]
else:
raise NoteFormatError("Unknown note format '%s'" % note)
# Check for '#' and 'b' postfixes
for post in note[1:]:
if post == 'b':
val -= 1
elif post == '#':
val += 1
return val % 12
def reduce_accidentals(note):
"""Reduce any extra accidentals to proper notes.
Example:
>>> reduce_accidentals('C####')
'E'
"""
val = note_to_int(note[0])
for token in note[1:]:
if token == 'b':
val -= 1
elif token == '#':
val += 1
else:
raise NoteFormatError("Unknown note format '%s'" % note)
if val >= note_to_int(note[0]):
return int_to_note(val % 12)
else:
return int_to_note(val % 12, 'b')
def from_shorthand(shorthand_string, slash=None):
"""Take a chord written in shorthand and return the notes in the chord.
The function can recognize triads, sevenths, sixths, ninths, elevenths,
thirteenths, slashed chords and a number of altered chords.
The second argument should not be given and is only used for a recursive
call when a slashed chord or polychord is found.
See http://tinyurl.com/3hn6v8u for a nice overview of chord patterns.
Examples:
>>> from_shorthand('Amin')
['A', 'C', 'E']
>>> from_shorthand('Am/M7')
['A', 'C', 'E', 'G#']
>>> from_shorthand('A')
['A', 'C#', 'E']
>>> from_shorthand('A/G')
['G', 'A', 'C#', 'E']
>>> from_shorthand('Dm|G')
['G', 'B', 'D', 'F', 'A']
Recognised abbreviations: the letters "m" and "M" in the following
abbreviations can always be substituted by respectively "min", "mi" or
"-" and "maj" or "ma".
Example:
>>> from_shorthand('Amin7') == from_shorthand('Am7')
True
Triads: 'm', 'M' or '', 'dim'
Sevenths: 'm7', 'M7', '7', 'm7b5', 'dim7', 'm/M7' or 'mM7'
Augmented chords: 'aug' or '+', '7#5' or 'M7+5', 'M7+', 'm7+', '7+'
Suspended chords: 'sus4', 'sus2', 'sus47' or '7sus4', 'sus', '11',
'sus4b9' or 'susb9'
Sixths: '6', 'm6', 'M6', '6/7' or '67', '6/9' or '69'
Ninths: '9' or 'add9', 'M9', 'm9', '7b9', '7#9'
Elevenths: '11' or 'add11', '7#11', 'm11'
Thirteenths: '13' or 'add13', 'M13', 'm13'
Altered chords: '7b5', '7b9', '7#9', '67' or '6/7'
Special: '5', 'NC', 'hendrix'
"""
# warning reduce??
if type(shorthand_string) == list:
res = []
for x in shorthand_string:
res.append(from_shorthand(x))
return res
if shorthand_string in ['NC', 'N.C.']:
return []
# Shrink shorthand_string to a format recognised by chord_shorthand
shorthand_string = shorthand_string.replace('min', 'm')
shorthand_string = shorthand_string.replace('mi', 'm')
shorthand_string = shorthand_string.replace('-', 'm')
shorthand_string = shorthand_string.replace('maj', 'M')
shorthand_string = shorthand_string.replace('ma', 'M')
# Get the note name
if not notes.is_valid_note(shorthand_string[0]):
raise NoteFormatError("Unrecognised note '%s' in chord '%s'"\
% (shorthand_string[0], shorthand_string))
name = shorthand_string[0]
# Look for accidentals
for n in shorthand_string[1:]:
if n == '#':
name += n
elif n == 'b':
name += n
else:
break
# Look for slashes and polychords '|'
slash_index = -1
s = 0
rest_of_string = shorthand_string[len(name):]
for n in rest_of_string:
if n == '/':
slash_index = s
elif n == '|':
# Generate polychord
return from_shorthand(
shorthand_string[:len(name) + s],
from_shorthand(shorthand_string[len(name) + s + 1:]))
s += 1
# Generate slash chord
if slash_index != -1 and rest_of_string not in ['m/M7', '6/9', '6/7']:
res = shorthand_string[:len(name) + slash_index]
return from_shorthand(shorthand_string[:len(name) + slash_index],
shorthand_string[len(name) + slash_index + 1:])
shorthand_start = len(name)
short_chord = shorthand_string[shorthand_start:]
if short_chord in chord_shorthand:
res = chord_shorthand[short_chord](name)
if slash != None:
# Add slashed chords
if type(slash) == str:
if notes.is_valid_note(slash):
res = [slash] + res
else:
raise NoteFormatError(
"Unrecognised note '%s' in slash chord'%s'" %
(slash, slash + shorthand_string))
elif type(slash) == list:
# Add polychords
r = slash
for n in res:
if n != r[-1]:
r.append(n)
return r
return res
else:
raise FormatError('Unknown shorthand: %s' % shorthand_string)
def __init__(self, note, octaves):
if note.islower():
raise NoteFormatError("Unrecognised note '%s'" % note)
self.tonic = note
self.octaves = octaves
