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chords.py
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chords.py
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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Created on Sat May 16 16:32:58 2020
@author: dennisbrookner
"""
from Music.notes import Note
from Music.triads import Triad
from Music.triads import trparser
sev_types = dict(M = ['F', 11],
m = ['D', 10])
class Chord(Triad):
def __init__(self, string):
kind = parser(string)
super(Chord, self).__init__(f'{kind[0]}{kind[1]}')
self._sev_type = kind[2], kind[3]
if self._sev_type[0]:
seventh = self.root().transpose(sev_types[self._sev_type[0]][1]).name()
self.seventh(seventh)
self.spell()
def seventh(self, seventh=None):
if seventh:
self._seventh = Note(seventh)
return self._seventh
def spell(self):
self.trspell()
if self._sev_type[0]:
base = sev_types[self._sev_type[0]][0]
d = Note(base).distance(self.root())
if d in range(1,6):
respell = self._triad_type != self._sev_type[0] and self.root().acc() == 'f'
if d in range(3,6) and respell:
self.root().to_sharp()
self.spell()
else:
self.seventh().to_sharp()
elif d in range(9,12):
self.seventh().to_flat()
elif d in range(6,9):
if self.root().acc() == 'f':
self.seventh().to_flat()
else:
self.seventh().to_sharp()
elif d == 0:
if base == 'F':
self.seventh().to_sharp()
else:
self.seventh().to_flat()
else:
raise ValueError(f'Unexpected transposition error with d = {d}')
return
def transpose(self, number):
new_root_name = self.root().transpose(number).name()
if self._sev_type[1]:
kind = self._sev_type[1]
else:
kind = self._triad_type
return Chord(f'{new_root_name}{kind}')
def __str__(self):
if self._sev_type[0]:
return (f'{self.root()}{self._sev_type[1]} chord: ' +
f'{self.root()} {self.third()} {self.fifth()} {self.seventh()}')
else:
return (f'{self.root()}{self._triad_type} chord: ' +
f'{self.root()} {self.third()} {self.fifth()}')
def __repr__(self):
if self._sev_type[0]:
return f'{self.root()} {self.third()} {self.fifth()} {self.seventh()}'
else:
return f'{self.root()} {self.third()} {self.fifth()}'
def parser(string):
if string[-1] != '7':
trstring = string
sevstring = None
sevkind = None
elif 'M' in string:
trstring = string[:-1]
sevstring = 'M'
sevkind = 'M7'
elif 'm' in string:
trstring = string[:-1]
sevstring = 'm'
sevkind = 'm7'
elif 'hd' in string:
trstring = f'{string[:-3]}d'
sevstring = 'm'
sevkind = 'hd7'
else:
trstring = f'{string[:-1]}M'
sevstring = 'm'
sevkind = '7'
name, triad_type = trparser(trstring)
return name, triad_type, sevstring, sevkind
def main():
# notes = ['C', 'G', 'D', 'A', 'E', 'Cb', 'B', 'F#', 'Gb', 'C#', 'Db', 'Ab',
# 'G#', 'Eb', 'D#', 'Bb', 'A#', 'F']
notes = ['C','Db', 'Gb', 'Cb']
suffixes = ['M', 'm', 'M7', 'm7', '7']
for i in notes:
for j in suffixes:
print(Chord(f'{i}{j}'))
print('')
# print(Chord('CM7'))
# print(Chord('Cm7'))
# print(Chord('C7'))
# print(Chord('CM'))
# print(Chord('Cm'))
# 'make everything run' workaround
if __name__ == '__main__': main()