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chorale.py
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chorale.py
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import re
from copy import deepcopy
class Chorale:
tabbeddata = 1
columnheadings = "PHRASE\tTAKT\tSOPRAN\tALT\tTENOR\tBASS\tHARMONIK"
columns = 1
columnbreaks = []
notepitches = {
'C': 0,
'C#': 1, 'Db': 1, 'Csharp': 1, 'Dflat': 1,
'D': 2,
'D#': 3, 'Eb': 3, 'Dsharp': 3, 'Eflat': 3,
'E': 4,
'F': 5, 'E#': 5,
'F#': 6, 'Gb': 6, 'Fsharp': 6, 'Gflat': 6,
'G': 7,
'G#': 8, 'Ab': 8, 'Gsharp': 8, 'Aflat': 8,
'A': 9,
'A#': 10, 'B': 10, 'Hb': 10,
'H': 11, 'B#': 11,
'H#': 12,
}
notesymbols = ['C', 'C#', 'D', 'D#', 'E', 'F', 'F#', 'G', 'G#', 'A', 'B', 'H', 'P']
BEFORE = ["0", "0", "P", "P", "P", "P", "0", "P,P,P,P", "0", "P:P:P:P",
"P;P;P;P", "P,P,P,P", "P,P,P,P", "P,P,P,P", "P,P,P,P"]
AFTER = ["0", "0", "END", "END", "END", "END", "0", "P,P,P,P", "0",
"P:P:P:P", "P;P;P;P", "P,P,P,P", "P,P,P,P", "P,P,P,P", "P,P,P,P"]
# write out the header lines of a chorale data file
def writeheaders(self, file, choralname, stimmen, tonart, takt, tempo, message):
file.write("Choralname = " + choralname + "\n")
file.write("Anzahl Stimmen = " + stimmen + "\n")
file.write("Tonart = " + tonart + "\n")
file.write("Takt = " + takt + "\n")
file.write("Tempo = " + tempo + "\n")
file.write(message + "\n")
file.write(self.columnheadings + "\n")
def readheaders(self, file):
choralname = ""
stimmen = ""
tonart = ""
takt = ""
tempo = ""
message = ""
for line in file:
if line == "\n":
break
if "Choralname" in line:
choralname = line.split('=')[1].split("\n")[0][1:]
if "Stimmen" in line:
stimmen = line.split('=')[1].split("\n")[0][1:]
if "Tonart" in line:
tonart = line.split('=')[1].split("\n")[0][1:]
if "Takt" in line:
takt = line.split('=')[1].split("\n")[0][1:]
if "Tempo" in line:
tempo = line.split('=')[1].split("\n")[0][1:]
if "Notentextausgabe" in line:
message = line
headers = file.readline()
self.columnheadings = headers
return [choralname, stimmen, tonart, takt, tempo, message]
# convert a note representation into a numerical value
def notepitch(self, note):
if "P" in note or "END" in note:
return -1
match = re.match('^\-*([ABCDEFGH#b]+)[ _]*([-\d]+)', note)
symbol = match.group(1)
octave = int(match.group(2))
noteval = self.notepitches[symbol]
return noteval + (octave + 4) * 12
def key2pitch(self, tonart):
tone = tonart.split("-")[0]
tone = tone + " -4"
return self.notepitch(tone)
def notesymbol(self, note): # convert a numerical note value to a textual representation
noteval = note % 12
octave = ((note - noteval) / 12) - 4
symbol = self.notesymbols[noteval]
if len(symbol) == 1:
symbol += " "
symbol += str(int(octave))
return symbol
def transposerow(self, keypitch, row):
for i in range(2, 6):
if row[i] != "" and "P" not in row[i]:
if row[i][0] == "-":
row[i] = "-" + self.notesymbol(self.notepitch(row[i]) - keypitch)
else:
row[i] = "" + self.notesymbol(self.notepitch(row[i]) - keypitch)
return row
def readchorale(self, filename, notranspose=False):
f = open(filename, 'r')
headers = self.readheaders(f)
[choralname, stimmen, tonart, takt, tempo, message] = headers
keypitch = self.key2pitch(tonart)
# event we're 'in' (so nothing to start with)
within = deepcopy(self.BEFORE)
lines = []
f.readline()
cont = 0
for line in f:
line = line.split("\n")[0]
row = line.split("\t")
if row == ['']:
row = ['', '', '', '', '', '', '']
elif not notranspose:
# transpose to C major/C minor
self.transposerow(keypitch, row)
for i in range(0, 7):
if row[i] == '':
if within[i][0] != "-":
row[i] = "-" + within[i]
else:
row[i] = within[i]
else:
row[i] = row[i].replace(" ", "_") # replace any spaces in tokens with underscores
within[i] = row[i]
intervals = ["0", "0", "0", "0"]
bass = None
for i in range(5, 1, -1):
if "P" in row[i] or row[i] == "END":
intervals[i - 2] = row[i]
else:
if bass is None:
bass = self.notepitch(row[i])
intervals[i - 2] = str(self.notepitch(row[i]) - bass)
if row[i][0] == "-":
intervals[i - 2] = "-" + intervals[i - 2]
row.append(":".join(intervals))
lines.append(row)
cont += 1
# print(row)
f.close()
if "/" not in lines[0][1]:
maxbeat = 0
beat = -1
for i in range(0, len(lines)):
row = deepcopy(lines[i])
if i % 4 == 0:
beat += 1
if "-" not in row[1] and row[1] != "0":
beat = 1
if i % 4 != 0:
row[1] = "-" + str(beat)
else:
row[1] = str(beat)
if beat > maxbeat:
maxbeat = beat
lines[i] = deepcopy(row)
for i in range(0, len(lines)):
lines[i][1] = lines[i][1] + "/" + str(maxbeat)
return [headers, lines]
def beatrows(self, lines):
linesB = []
for i in range(0, len(lines), +4):
row = lines[i]
ornamentation = []
tornamentation = [] # transposed relative to initial notes
for j in range(0, 4):
sequence = []
tsequence = []
sequence = [row[j + 2], lines[i + 1][j + 2], lines[i + 2][j + 2], lines[i + 3][j + 2]]
ornamentation.append(",".join(sequence))
firstnote = None
for note in sequence:
firstnote = self.notepitch(note)
if "-" not in note and "P" not in note and note != "" and note != "END":
tsequence.append(str(self.notepitch(note) - firstnote))
else:
tsequence.append("-")
tornamentation.append(",".join(tsequence))
row = row[0:7] + ["/".join(ornamentation)] + [row[7]]
row.append(";".join(tornamentation))
row.append(ornamentation[0])
row.append(tornamentation[1])
row.append(tornamentation[2])
row.append(tornamentation[3])
if i + 4 > len(lines) - 1:
row = row[0:7] + ["END,END,END,END"] + row[7:len(row)]
else:
nextbeatrow = lines[i + 4]
intervals = [] # to next notes
for j in range(0, 4):
# / - * P /
if "P" not in nextbeatrow[j + 2] and "P" not in row[j + 2]:
intervals.append(str(self.notepitch(nextbeatrow[j + 2]) - self.notepitch(row[j + 2])) + ">" +
str(self.notepitch(row[j + 2]) % 12))
else:
intervals.append("P")
row = row[0:7] + [",".join(intervals)] + row[7:len(row)] # intervals to next beat's notes
linesB.append(row)
return linesB
def unpackchordsymbols(self, lines):
for i in range(0, len(lines)):
row = deepcopy(lines[i])
if len(row) == 7 and ":" in row[6] and "/" in row[6]:
[soprano, row[3], row[4], row[5]] = "/".split(row[6])
elif len(row) == 7 and ":" in row[6]:
if row[2] != "":
intervals = row[6].split(":")
soprano = self.notepitch(row[2])
intervals[0] = intervals[0].lstrip("-")
for j in range(3, 6):
if not intervals[j - 2].lstrip("-").isdigit():
row[j] = intervals[j - 2]
else:
prefix = ""
if "-" in intervals[j - 2]:
prefix = "-"
intervals[j - 2] = intervals[j - 2].replace("-", "")
row[j] = prefix + self.notesymbol(soprano - (int(intervals[0]) - int(intervals[j - 2])))
lines[i] = deepcopy(row)
return lines
def tidychorale(self, lines):
for i in range(0, len(lines)):
row = ["", "", "", "", "", "", "", ""]
ev = deepcopy(row)
for k in range(0, len(lines[i])):
row[k] = lines[i][k]
# for j in range(len(row), 7, -1):
# print(j)
# row[j] = ""
for j in range(0, 7):
if row[j] != "" and row[j][0] == "-":
row[j] = ""
else:
ev[j] = row[j]
row[j] = row[j].replace("_", " ")
lines[i] = deepcopy(row)
return lines
def writechorale(self, filename, headers, lines):
f = open(filename, 'w+')
[choralname, stimmen, tonart, takt, tempo, message] = headers
self.writeheaders(f, choralname, stimmen, tonart, takt, tempo, message)
f.write("\n")
for i in range(0, len(lines)):
f.write("\t".join(lines[i]) + "\t\t\n")
f.close()