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pae2abc.py
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pae2abc.py
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#!/usr/bin/python3
# -*- coding: utf-8 -*-
# A Plaine and Easie Code to ABC music notation converter
# References:
# PAE: http://www.iaml.info/en/activities/projects/plain_and_easy_code
# ABC: http://abcnotation.com/wiki/abc:standard:v2.1
# pae2abc: https://github.com/fjorba/pae2abc
# Released under GPLv3 or later
from __future__ import print_function, division
import os
import sys
import argparse
# Valid characters for each pae element
valid_pae_chars = {
'bar': ':/',
'octaves': "',",
'notes': 'CDEFGAB',
'clef': 'GgCcFf+-12345',
'timesig': '12346789/co.',
'notelength': '0123456789.',
'accidentals': 'xbnCDEFGAB[]',
'tune': "CDEFGAB ',0123456789.xbngqr-=/:t+^();{}!fi",
}
# Valid characters for a few abc elements
valid_abc_chars = {
'fields': 'XTtBCDFGHIKLMmNOPQRrSsUVWwZ',
# L, M and K fields do not appear in the next header_fields
# list because they are created from the original pae value.
'header_fields': 'XTABCDFGHImNOPRrSUZ',
# Next body_fields list is somewhat more restricted than the
# standard one; for simplicity, we only consider those fields
# not allowed in file header. As they are hardly conceivable
# as pae values, this restriction should not be a problem.
'body_fields': 'NQsVWw',
'notes': 'CDEFGABcdefgab',
'accidentals': '^_=',
}
def clef2abc(pae):
'''Translate pae clef to abc'''
pae2abc = {
# List is short enough, it is easier to be explicit.
'C1': 'alto1',
'C2': 'alto2',
'C3': 'alto3',
'C4': 'alto4',
'C5': 'alto5',
'F1': 'bass1',
'F2': 'bass2',
'F3': 'bass3',
'F4': 'bass4',
'F5': 'bass5',
'G1': 'treble1',
'G2': 'treble2',
'G3': 'treble3',
'G4': 'treble4',
'G5': 'treble5',
'c2': 'alto-8',
'f2': 'bass-8',
'g2': 'treble-8',
}
if len(pae) == 3:
# Either has the correct length, or it is invalid
shape = pae[0]
notation = pae[1]
position = pae[2]
else:
# Default values
shape = 'G'
notation = '-'
position = '2'
clef = shape + position
if clef in pae2abc:
abc = pae2abc[clef]
else:
abc = pae2abc['G2'] # Default
if notation == '+':
abc += ' stafflines=4' # Old notation
return abc
def accidentals2abc(pae):
'''Translate pae accidentals to abc'''
# TODO: check notes order and maybe choose old modes or explicit notes
pae2abc = {
'': 'C',
'x1': 'G',
'x2': 'D',
'x3': 'A',
'x4': 'E',
'x5': 'B',
'x6': 'F#',
'x7': 'C#',
'b1': 'F',
'b2': 'Bb',
'b3': 'Eb',
'b4': 'Ab',
'b5': 'Db',
'b6': 'Gb',
'b7': 'Cb',
}
if pae:
pae = pae.replace('[', '').replace(']', '')
accidental = pae[0]
notes = pae[1:]
key = '%s%s' % (accidental, len(notes))
if key in pae2abc:
abc = pae2abc[key]
else:
abc = pae2abc['']
else:
abc = pae2abc['']
return abc
def timesig2abc(pae):
'''Translate pae time signature to abc'''
abc = pae.replace('c', 'C').replace('C/', 'C|')
return abc
def bar2abc(pae):
'''Translate pae bars to abc'''
pae2abc = {
'/': '|',
'//': '||',
'//:': '[|:',
'://': ':|]',
'://:': '::',
}
if pae in pae2abc:
abc = pae2abc[pae]
else:
abc = pae2abc['/']
return abc
def notelength2abc(pae):
'''Translate note lengths bars to abc, using abc 1/4 as base'''
# Thanks to http://www.asafraction.co.uk/
pae2abc = {
'0': '16', # longa
'9...': '15',
'9..': '14',
'9.': '12',
'9': '8', # breve
'1...': '15/2',
'1..': '7',
'1.': '6',
'1': '4', # whole note / semibreve (rodona)
'2...': '15/4',
'2..': '7/2',
'2.': '3',
'2': '2', # half-note / minim (blanca)
'4...': '15/8',
'4..': '7/4',
'4.': '3/2',
'4': '', # quarter-note / crochet / semminim (negra)
'8...': '15/16',
'8..': '7/8',
'8.': '3/4',
'8': '/2', # eighth-note / quaver / fusa /
'6...': '15/32',
'6..': '7/16',
'6.': '3/8',
'6': '/4', # 16th-note / semiquaver / semifusa /
'3...': '15/64',
'3..': '7/32',
'3.': '3/16',
'3': '/8', # 32nd-note / demisemiquaver
'5...': '15/128',
'5..': '7/64',
'5.': '3/32',
'5': '/16', # 64th- note / hemidemisemiquaver
'7...': '15/256',
'7..': '7/128',
'7.': '3/64',
'7': '/32', # 128th-note
}
if pae in pae2abc:
abc = pae2abc[pae]
else:
abc = pae
return abc
def tune2abc(pae, number=''):
'''Translate pae tune to abc'''
# Set some defaults
note = ''
octave = "'"
slur = False
trill = False
chord = False
beaming = False
acciaccatura = False
appoggiatura = False
rhythmic_model = False
rhythmic_backup = False
irregular_group = False
# Input and output structures are lists.
pae_list = list(pae)
abc_list = []
while pae_list:
# Main loop parser. Get next pae character and convert it to abc
c = pae_list.pop(0)
if c == 'b':
# flatten
note = '_'
elif c == 'x':
# sharpen
note = '^'
elif c == 'n':
# naturalise
note = '='
elif c == 't':
# trill
trill = c
elif c == '+':
# slur
slur = c
elif c == 'g':
# acciacciatura
acciaccatura = c
if pae_list and pae_list[0] == c:
acciaccatura += pae_list.pop(0)
beaming = True
elif c == 'q':
# appoggiatura
appoggiatura = c
if pae_list and pae_list[0] == c:
appoggiatura += pae_list.pop(0)
beaming = True
elif c == '(':
# This can be either a fermata (includes only one note or
# rest; accidentals or octave symbols must be outside the
# parentheses) or an irregular rhythmic group.
i = 0
notes = ''
while pae_list and pae_list[i] != ')' and i < len(pae_list)-1:
if pae_list[i] in valid_pae_chars['notes'] + '-':
notes += pae_list[i]
i += 1
if len(notes) == 1:
# Single note or silence: fermata
abc_list.append('H')
else:
if not number:
number = '8'
irregular_group = number
abc_list.append('(') # Remember the position where it starts
elif c == ';':
# Second number of irregular group
if pae_list and pae_list[0].isdigit():
number = pae_list.pop(0)
# In ABC the order of the numbers is reversed
irregular_group = '%s:%s' % (number, irregular_group)
elif c == ')':
if irregular_group:
# close irregular group
if len(irregular_group) == 1:
irregular_group = '3'
# Look for ( to add the pair of p:q numbers
found = [i for i in range(len(abc_list)) if '(' in abc_list[i]]
if found:
i = found[-1]
abc_list[i] = '(%s' % (irregular_group)
if not beaming:
abc_list[i] += ' '
irregular_group = ''
number = '' # Needed?
elif c == 'i':
# Repeat last measure
# Fist, find where bar signs are
found = [i for i in range(len(abc_list)) if '|' in abc_list[i]]
if len(found) == 1:
# If there was a single bar sign, add a -2 (that will
# become a zero later) as first position.
found.insert(0, -2)
# Extract last measure values, excluding bar signs,
# because they are handled by the /i/ syntax anyway.
last_measure = abc_list[found[-2]+2:found[-1]]
abc_list.extend(last_measure)
elif c == '!':
# Repetition of notes
if c in abc_list:
# A previous ! marks the start position of the group
# to repeat
found = abc_list.index(c)
abc_list.remove(c)
# Count how many times (how many f) has to be repeated
n = 0
while pae_list and pae_list[0] == 'f':
pae_list.pop(0)
n += 1
repeat = abc_list[found:] * n
abc_list.extend(repeat)
else:
abc_list.append(c)
elif c == '{':
beaming = True
elif c == '}':
abc_list.append(' ')
beaming = False
elif c == 'r':
abc_list.append('}')
beaming = False
elif c in valid_pae_chars['octaves']:
# octave
octave = c
while pae_list and pae_list[0] in valid_pae_chars['octaves']:
octave += pae_list.pop(0)
elif c in valid_pae_chars['notelength']:
# note length
number = c
while pae_list and pae_list[0] in valid_pae_chars['notelength']:
number += pae_list.pop(0)
if pae_list and '(' in pae_list[0]:
irregular_group = number
elif c == '=':
# measure rest
number = ''
while pae_list and pae_list[0].isdigit():
number += pae_list.pop(0)
if number == '1':
number = ''
abc_list.append('Z' + number)
abc_list.append(' ')
number = ''
elif c == '-':
# note rest
abc_list.append('z' + notelength2abc(number))
abc_list.append(' ')
elif c == '^':
# Chord
chord = c
elif c in valid_pae_chars['bar']:
# bar
bar = c
while pae_list and pae_list[0] in valid_pae_chars['bar']:
bar += pae_list.pop(0)
abc_list.append(bar2abc(bar))
abc_list.append(' ')
elif c in valid_pae_chars['notes']:
# notes
if octave == "'":
note += c
elif octave == "''":
note += c.lower()
elif octave == "'''":
note += c.lower() + "'"
elif octave == "''''":
note += c.lower() + "'''"
elif octave in [',', ',,', ',,,']:
note += c + octave
if number:
if number.startswith('.'):
# That's a syntax error, ignore
number = number[1:]
if rhythmic_model:
# A new number signals the end of previous rhythmic model
rhythmic_model = None
rhythmic_backup = None
if len(number) > 1:
# Start a new rhythmic model pattern
rhythmic_model = []
for c in number:
if c == '.':
# Group dot with its preceding value
rhythmic_model[-1] += c
else:
rhythmic_model.append(c)
# We need a full [:] backup of the rhythmic model
# as we will consume the working copy as we use it.
rhythmic_backup = rhythmic_model[:]
number = ''
note += notelength2abc(rhythmic_model.pop(0))
else:
note += notelength2abc(number)
elif rhythmic_model or rhythmic_backup:
if not rhythmic_model:
# Model exhausted; start anew
rhythmic_model = rhythmic_backup[:]
note += notelength2abc(rhythmic_model.pop(0))
if appoggiatura:
if len(appoggiatura) == 1:
note = '{%s}' % (note)
else:
# closed by the next r
note = '{%s' % (note)
appoggiatura = False
elif acciaccatura:
if len(acciaccatura) == 1:
note = '{/%s}' % (note)
else:
# closed by the next r
note = '{/%s' % (note)
acciaccatura = False
elif slur or trill or chord:
# All share the same logic; handle them together.
# Look for most recent note or silence (for slur only)
valid_chars = valid_abc_chars['notes']
if slur:
valid_chars += 'z'
i = len(abc_list) - 1
while i >= 0:
found = [True for c in abc_list[i]
if c in valid_chars]
if found:
break
else:
i -= 1
if i >= 0:
if trill:
abc_list[i] = 'T%s' % (abc_list[i])
trill = False
if slur:
abc_list[i] = '(%s' % (abc_list[i])
note += ')'
slur = False
if chord:
# Leave notes only, remove spaces
while abc_list and abc_list[-1] == ' ':
abc_list.pop()
# Check whether the chord is already opened
open_chord = True
j = i
while j >= 0:
if abc_list[j] == '[':
# Found a 2 or more notes chord
open_chord = False
break
elif abc_list[j] == ']':
break
j -= 1
if open_chord:
abc_list.insert(i, '[')
if pae_list:
if pae_list[0] == '^':
chord = ''
else:
chord = ']'
else:
chord = ']'
abc_list.append(note)
note = ''
if chord == ']':
abc_list.append(chord)
chord = ''
if not beaming:
abc_list.append(' ')
abc = ''.join(abc_list)
return (abc, number)
def pae2abc(pae, fields={}):
'''Main converter funcion; split the pae string into header and
body, and convert them'''
# Destination structure
abc = {
'header': {
'clef': '',
'accidentals': '',
'timesig': '',
},
'body': {
'tune': '',
}
}
# Add pseudo-abc fields
if not 'X' in fields:
abc['header']['X'] = 1
for field in fields:
abc['header'][field] = fields[field]
number = ''
# Split the pae string in header (clef, accidentals and time
# signature) and body, looping one char at a time.
pae_list = list(pae)
while pae_list:
c = pae_list.pop(0)
if c == '%':
value = ''
while pae_list and pae_list[0] in valid_pae_chars['clef']:
value += pae_list.pop(0)
if not abc['header']['clef']:
abc['header']['clef'] = clef2abc(value)
else:
abc['body']['tune'] += '[K: %s] ' % (clef2abc(value))
elif c == '$':
value = ''
while pae_list and pae_list[0] in valid_pae_chars['accidentals']:
value += pae_list.pop(0)
if not abc['header']['accidentals']:
abc['header']['accidentals'] = accidentals2abc(value)
else:
abc['body']['tune'] += '[K: %s] ' % (accidentals2abc(value))
elif c == '@':
value = ''
while pae_list and pae_list[0] in valid_pae_chars['timesig']:
value += pae_list.pop(0)
if not abc['header']['timesig']:
abc['header']['timesig'] = timesig2abc(value)
else:
abc['body']['tune'] += '[M: %s] ' % (timesig2abc(value))
elif c == ' ':
value = ''
while pae_list and pae_list[0] in valid_pae_chars['tune']:
value += pae_list.pop(0)
(tune, number) = tune2abc(value, number)
abc['body']['tune'] += tune
# Build a proper abc stanza, filling only those available fields
out = []
for field in valid_abc_chars['header_fields']:
if field in abc['header']:
out.append('%s: %s' % (field, abc['header'][field]))
out.append('L: 1/4')
out.append('M: %s' % (abc['header']['timesig']))
out.append('K: %s %s' % (abc['header']['accidentals'],
abc['header']['clef']))
out.append('%s' % (abc['body']['tune']))
for field in valid_abc_chars['body_fields']:
if field in abc['header']:
out.append('%s: %s' % (field, abc['header'][field]))
if args.debug:
# TODO: change to new syntax (stylesheet?)
out.append('%%writefields N true')
out.append('%%annotationfont Courier 11')
out.append('N: pae: %s' % (pae.replace('%', '')))
out.append('N: abc: %s' % (abc['body']['tune']))
out.append('')
return '\n'.join(out)
def convert_pae_file(filename):
'''Convert a file with PAE entries, with optional ABC fields'''
print('%abc-2.1\n')
n = 0
pae = ''
fields = {}
with open(filename) as f:
for line in f:
line = line.strip()
if len(line) > 2:
if line[0] in valid_abc_chars['fields'] and line[1] == ':':
key = line[0]
value = line[2:].strip()
fields[key] = value
elif line[0] == '@' and ':' in line:
# Verovio PAE file format
key, value = line.split(':', 1)
if key == '@clef':
pae += '%%%s' % (value)
elif key == '@keysig':
pae += '$%s' % (value)
elif key == '@timesig':
pae += '@%s' % (value)
elif key == '@data':
pae += ' %s' % (value)
abc = pae2abc(pae, {})
print(abc)
fields = {}
pae = ''
elif line[0].startswith('%'):
if not 'X' in fields:
n += 1
fields['X'] = n
abc = pae2abc(line, fields)
print(abc)
fields = {}
return
def main(args):
'''Either convert a file or a supplied string as parameter.'''
if args.file:
if os.path.isfile(args.file):
convert_pae_file(args.file)
else:
print('Error: %s not found' % (args.file), file=sys.stderr)
sys.exit(1)
elif args.pae:
abc = pae2abc(args.pae)
print(abc)
if __name__ == '__main__':
parser = argparse.ArgumentParser(description='A Plaine and Easie Code to ABC music notation converter')
parser.add_argument('-f', '--file',
nargs='?',
default='',
help='input file')
parser.add_argument('-d', '--debug',
action='store_true',
default=False,
help='debug mode')
parser.add_argument('pae',
nargs='?',
default='',
action='store')
args = parser.parse_args()
if not args.file and not args.pae:
parser.error('Either --file or a pae string are required')
main(args)