Source code for openlp.plugins.songs.lib

# -*- coding: utf-8 -*-
# vim: autoindent shiftwidth=4 expandtab textwidth=120 tabstop=4 softtabstop=4

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# OpenLP - Open Source Lyrics Projection                                      #
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# Copyright (c) 2008-2017 OpenLP Developers                                   #
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"""
The :mod:`~openlp.plugins.songs.lib` module contains a number of library functions and classes used in the Songs plugin.
"""

import logging
import os
import re

from PyQt5 import QtWidgets

from openlp.core.common import AppLocation, CONTROL_CHARS, Settings
from openlp.core.lib import translate, clean_tags
from openlp.plugins.songs.lib.db import Author, MediaFile, Song, Topic
from openlp.plugins.songs.lib.ui import SongStrings

log = logging.getLogger(__name__)

WHITESPACE = re.compile(r'[\W_]+', re.UNICODE)
APOSTROPHE = re.compile('[\'`’ʻ′]', re.UNICODE)
# PATTERN will look for the next occurence of one of these symbols:
#   \controlword - optionally preceded by \*, optionally followed by a number
#   \'## - where ## is a pair of hex digits, representing a single character
#   \# - where # is a single non-alpha character, representing a special symbol
#   { or } - marking the beginning/end of a group
#   a run of characters without any \ { } or end-of-line
PATTERN = re.compile(
    r"(\\\*)?\\([a-z]{1,32})(-?\d{1,10})?[ ]?|\\'([0-9a-f]{2})|\\([^a-z*])|([{}])|[\r\n]+|([^\\{}\r\n]+)", re.I)
# RTF control words which specify a "destination" to be ignored.
DESTINATIONS = frozenset((
    'aftncn', 'aftnsep', 'aftnsepc', 'annotation', 'atnauthor', 'atndate', 'atnicn', 'atnid', 'atnparent', 'atnref',
    'atntime', 'atrfend', 'atrfstart', 'author', 'background', 'bkmkend', 'bkmkstart', 'blipuid', 'buptim', 'category',
    'colorschememapping', 'colortbl', 'comment', 'company', 'creatim', 'datafield', 'datastore', 'defchp', 'defpap',
    'do', 'doccomm', 'docvar', 'dptxbxtext', 'ebcend', 'ebcstart', 'factoidname', 'falt', 'fchars', 'ffdeftext',
    'ffentrymcr', 'ffexitmcr', 'ffformat', 'ffhelptext', 'ffl', 'ffname', 'ffstattext', 'file', 'filetbl', 'fldinst',
    'fldtype', 'fname', 'fontemb', 'fontfile', 'footer', 'footerf', 'footerl', 'footerr', 'footnote', 'formfield',
    'ftncn', 'ftnsep', 'ftnsepc', 'g', 'generator', 'gridtbl', 'header', 'headerf', 'headerl', 'headerr', 'hl', 'hlfr',
    'hlinkbase', 'hlloc', 'hlsrc', 'hsv', 'htmltag', 'info', 'keycode', 'keywords', 'latentstyles', 'lchars',
    'levelnumbers', 'leveltext', 'lfolevel', 'linkval', 'list', 'listlevel', 'listname', 'listoverride',
    'listoverridetable', 'listpicture', 'liststylename', 'listtable', 'listtext', 'lsdlockedexcept', 'macc', 'maccPr',
    'mailmerge', 'maln', 'malnScr', 'manager', 'margPr', 'mbar', 'mbarPr', 'mbaseJc', 'mbegChr', 'mborderBox',
    'mborderBoxPr', 'mbox', 'mboxPr', 'mchr', 'mcount', 'mctrlPr', 'md', 'mdeg', 'mdegHide', 'mden', 'mdiff', 'mdPr',
    'me', 'mendChr', 'meqArr', 'meqArrPr', 'mf', 'mfName', 'mfPr', 'mfunc', 'mfuncPr', 'mgroupChr', 'mgroupChrPr',
    'mgrow', 'mhideBot', 'mhideLeft', 'mhideRight', 'mhideTop', 'mhtmltag', 'mlim', 'mlimloc', 'mlimlow', 'mlimlowPr',
    'mlimupp', 'mlimuppPr', 'mm', 'mmaddfieldname', 'mmath', 'mmathPict', 'mmathPr', 'mmaxdist', 'mmc', 'mmcJc',
    'mmconnectstr', 'mmconnectstrdata', 'mmcPr', 'mmcs', 'mmdatasource', 'mmheadersource', 'mmmailsubject', 'mmodso',
    'mmodsofilter', 'mmodsofldmpdata', 'mmodsomappedname', 'mmodsoname', 'mmodsorecipdata', 'mmodsosort', 'mmodsosrc',
    'mmodsotable', 'mmodsoudl', 'mmodsoudldata', 'mmodsouniquetag', 'mmPr', 'mmquery', 'mmr', 'mnary', 'mnaryPr',
    'mnoBreak', 'mnum', 'mobjDist', 'moMath', 'moMathPara', 'moMathParaPr', 'mopEmu', 'mphant', 'mphantPr', 'mplcHide',
    'mpos', 'mr', 'mrad', 'mradPr', 'mrPr', 'msepChr', 'mshow', 'mshp', 'msPre', 'msPrePr', 'msSub', 'msSubPr',
    'msSubSup', 'msSubSupPr', 'msSup', 'msSupPr', 'mstrikeBLTR', 'mstrikeH', 'mstrikeTLBR', 'mstrikeV', 'msub',
    'msubHide', 'msup', 'msupHide', 'mtransp', 'mtype', 'mvertJc', 'mvfmf', 'mvfml', 'mvtof', 'mvtol', 'mzeroAsc',
    'mzFrodesc', 'mzeroWid', 'nesttableprops', 'nextfile', 'nonesttables', 'objalias', 'objclass', 'objdata', 'object',
    'objname', 'objsect', 'objtime', 'oldcprops', 'oldpprops', 'oldsprops', 'oldtprops', 'oleclsid', 'operator',
    'panose', 'password', 'passwordhash', 'pgp', 'pgptbl', 'picprop', 'pict', 'pn', 'pnseclvl', 'pntext', 'pntxta',
    'pntxtb', 'printim', 'private', 'propname', 'protend', 'protstart', 'protusertbl', 'pxe', 'result', 'revtbl',
    'revtim', 'rsidtbl', 'rxe', 'shp', 'shpgrp', 'shpinst', 'shppict', 'shprslt', 'shptxt', 'sn', 'sp', 'staticval',
    'stylesheet', 'subject', 'sv', 'svb', 'tc', 'template', 'themedata', 'title', 'txe', 'ud', 'upr', 'userprops',
    'wgrffmtfilter', 'windowcaption', 'writereservation', 'writereservhash', 'xe', 'xform', 'xmlattrname',
    'xmlattrvalue', 'xmlclose', 'xmlname', 'xmlnstbl', 'xmlopen'
))
# Translation of some special characters.
SPECIAL_CHARS = {
    '\n': '\n',
    '\r': '\n',
    '~': '\u00A0',
    '-': '\u00AD',
    '_': '\u2011',
    'par': '\n',
    'sect': '\n\n',
    # Required page and column break.
    # Would be good if we could split verse into subverses here.
    'page': '\n\n',
    'column': '\n\n',
    # Soft breaks.
    'softpage': '[---]',
    'softcol': '[---]',
    'line': '\n',
    'tab': '\t',
    'emdash': '\u2014',
    'endash': '\u2013',
    'emspace': '\u2003',
    'enspace': '\u2002',
    'qmspace': '\u2005',
    'bullet': '\u2022',
    'lquote': '\u2018',
    'rquote': '\u2019',
    'ldblquote': '\u201C',
    'rdblquote': '\u201D',
    'ltrmark': '\u200E',
    'rtlmark': '\u200F',
    'zwj': '\u200D',
    'zwnj': '\u200C'
}
CHARSET_MAPPING = {
    '0': 'cp1252',
    '128': 'cp932',
    '129': 'cp949',
    '134': 'cp936',
    '161': 'cp1253',
    '162': 'cp1254',
    '163': 'cp1258',
    '177': 'cp1255',
    '178': 'cp1256',
    '186': 'cp1257',
    '204': 'cp1251',
    '222': 'cp874',
    '238': 'cp1250'
}


[docs]class VerseType(object): """ VerseType provides an enumeration for the tags that may be associated with verses in songs. """ Verse = 0 Chorus = 1 Bridge = 2 PreChorus = 3 Intro = 4 Ending = 5 Other = 6 names = ['Verse', 'Chorus', 'Bridge', 'Pre-Chorus', 'Intro', 'Ending', 'Other'] tags = [name[0].lower() for name in names] translated_names = [ translate('SongsPlugin.VerseType', 'Verse'), translate('SongsPlugin.VerseType', 'Chorus'), translate('SongsPlugin.VerseType', 'Bridge'), translate('SongsPlugin.VerseType', 'Pre-Chorus'), translate('SongsPlugin.VerseType', 'Intro'), translate('SongsPlugin.VerseType', 'Ending'), translate('SongsPlugin.VerseType', 'Other')] translated_tags = [name[0].lower() for name in translated_names]
[docs] @staticmethod def translated_tag(verse_tag, default=Other): """ Return the translated UPPERCASE tag for a given tag, used to show translated verse tags in UI :param verse_tag: The string to return a VerseType for :param default: Default return value if no matching tag is found :return: A translated UPPERCASE tag """ verse_tag = verse_tag[0].lower() for num, tag in enumerate(VerseType.tags): if verse_tag == tag: return VerseType.translated_tags[num].upper() if len(VerseType.names) > default: return VerseType.translated_tags[default].upper() else: return VerseType.translated_tags[VerseType.Other].upper()
[docs] @staticmethod def translated_name(verse_tag, default=Other): """ Return the translated name for a given tag :param verse_tag: The string to return a VerseType for :param default: Default return value if no matching tag is found :return: Translated name for the given tag """ verse_tag = verse_tag[0].lower() for num, tag in enumerate(VerseType.tags): if verse_tag == tag: return VerseType.translated_names[num] if len(VerseType.names) > default: return VerseType.translated_names[default] else: return VerseType.translated_names[VerseType.Other]
[docs] @staticmethod def from_tag(verse_tag, default=Other): """ Return the VerseType for a given tag :param verse_tag: The string to return a VerseType for :param default: Default return value if no matching tag is found (a valid VerseType or None) :return: A VerseType of the tag """ verse_tag = verse_tag[0].lower() for num, tag in enumerate(VerseType.tags): if verse_tag == tag: return num if default in range(0, len(VerseType.names)) or default is None: return default else: return VerseType.Other
[docs] @staticmethod def from_translated_tag(verse_tag, default=Other): """ Return the VerseType for a given tag :param verse_tag: The string to return a VerseType for :param default: Default return value if no matching tag is found :return: The VerseType of a translated tag """ verse_tag = verse_tag[0].lower() for num, tag in enumerate(VerseType.translated_tags): if verse_tag == tag: return num if default in range(0, len(VerseType.names)) or default is None: return default else: return VerseType.Other
[docs] @staticmethod def from_string(verse_name, default=Other): """ Return the VerseType for a given string :param verse_name: The string to return a VerseType for :param default: Default return value if no matching tag is found :return: The VerseType determined from the string """ verse_name = verse_name.lower() for num, name in enumerate(VerseType.names): if verse_name == name.lower(): return num return default
[docs] @staticmethod def from_translated_string(verse_name): """ Return the VerseType for a given string :param verse_name: The string to return a VerseType for :return: A VerseType """ verse_name = verse_name.lower() for num, translation in enumerate(VerseType.translated_names): if verse_name == translation.lower(): return num return None
[docs] @staticmethod def from_loose_input(verse_name, default=Other): """ Return the VerseType for a given string :param verse_name: The string to return a VerseType for :param default: Default return value if no matching tag is found :return: A VerseType """ if len(verse_name) > 1: verse_index = VerseType.from_translated_string(verse_name) if verse_index is None: verse_index = VerseType.from_string(verse_name, default) elif len(verse_name) == 1: verse_index = VerseType.from_translated_tag(verse_name, None) if verse_index is None: verse_index = VerseType.from_tag(verse_name, default) else: return default return verse_index
[docs]def retrieve_windows_encoding(recommendation=None): """ Determines which encoding to use on an information source. The process uses both automated detection, which is passed to this method as a recommendation, and user confirmation to return an encoding. :param recommendation: A recommended encoding discovered programmatically for the user to confirm. :return: A list of recommended encodings, or None """ # map chardet result to compatible windows standard code page codepage_mapping = {'IBM866': 'cp866', 'TIS-620': 'cp874', 'SHIFT_JIS': 'cp932', 'GB2312': 'cp936', 'HZ-GB-2312': 'cp936', 'EUC-KR': 'cp949', 'Big5': 'cp950', 'ISO-8859-2': 'cp1250', 'windows-1250': 'cp1250', 'windows-1251': 'cp1251', 'windows-1252': 'cp1252', 'ISO-8859-7': 'cp1253', 'windows-1253': 'cp1253', 'ISO-8859-8': 'cp1255', 'windows-1255': 'cp1255'} if recommendation in codepage_mapping: recommendation = codepage_mapping[recommendation] # Show dialog for encoding selection encodings = [ ('cp1256', translate('SongsPlugin', 'Arabic (CP-1256)')), ('cp1257', translate('SongsPlugin', 'Baltic (CP-1257)')), ('cp1250', translate('SongsPlugin', 'Central European (CP-1250)')), ('cp1251', translate('SongsPlugin', 'Cyrillic (CP-1251)')), ('cp1253', translate('SongsPlugin', 'Greek (CP-1253)')), ('cp1255', translate('SongsPlugin', 'Hebrew (CP-1255)')), ('cp932', translate('SongsPlugin', 'Japanese (CP-932)')), ('cp949', translate('SongsPlugin', 'Korean (CP-949)')), ('cp936', translate('SongsPlugin', 'Simplified Chinese (CP-936)')), ('cp874', translate('SongsPlugin', 'Thai (CP-874)')), ('cp950', translate('SongsPlugin', 'Traditional Chinese (CP-950)')), ('cp1254', translate('SongsPlugin', 'Turkish (CP-1254)')), ('cp1258', translate('SongsPlugin', 'Vietnam (CP-1258)')), ('cp1252', translate('SongsPlugin', 'Western European (CP-1252)')) ] recommended_index = -1 if recommendation: for index, encoding in enumerate(encodings): if recommendation == encoding[0]: recommended_index = index break if recommended_index > -1: choice = QtWidgets.QInputDialog.getItem( None, translate('SongsPlugin', 'Character Encoding'), translate('SongsPlugin', 'The codepage setting is responsible\n' 'for the correct character representation.\n' 'Usually you are fine with the preselected choice.'), [pair[1] for pair in encodings], recommended_index, False) else: choice = QtWidgets.QInputDialog.getItem( None, translate('SongsPlugin', 'Character Encoding'), translate('SongsPlugin', 'Please choose the character encoding.\n' 'The encoding is responsible for the correct character representation.'), [pair[1] for pair in encodings], 0, False) if not choice[1]: return None return next(filter(lambda item: item[1] == choice[0], encodings))[0]
[docs]def clean_string(string): """ Strips punctuation from the passed string to assist searching. :param string: The string to clean :return: A clean string """ return WHITESPACE.sub(' ', APOSTROPHE.sub('', string)).lower()
[docs]def clean_title(title): """ Cleans the song title by removing Unicode control chars groups C0 & C1, as well as any trailing spaces. :param title: The song title to clean :return: A clean title """ return CONTROL_CHARS.sub('', title).rstrip()
[docs]def clean_song(manager, song): """ Cleans the search title, rebuilds the search lyrics, adds a default author if the song does not have one and other clean ups. This should always called when a new song is added or changed. :param manager: The song database manager object. :param song: The song object. """ from .openlyricsxml import SongXML if song.title: song.title = clean_title(song.title) else: song.title = '' if song.alternate_title: song.alternate_title = clean_title(song.alternate_title) else: song.alternate_title = '' song.search_title = clean_string(song.title) + '@' + clean_string(song.alternate_title) if isinstance(song.lyrics, bytes): song.lyrics = str(song.lyrics, encoding='utf8') verses = SongXML().get_verses(song.lyrics) song.search_lyrics = ' '.join([clean_string(clean_tags(verse[1], True)) for verse in verses]) # The song does not have any author, add one. if not song.authors_songs: name = SongStrings.AuthorUnknown author = manager.get_object_filtered(Author, Author.display_name == name) if author is None: author = Author.populate(display_name=name, last_name='', first_name='') song.add_author(author) if song.copyright: song.copyright = CONTROL_CHARS.sub('', song.copyright).strip()
[docs]def get_encoding(font, font_table, default_encoding, failed=False): """ Finds an encoding to use. Asks user, if necessary. :param font: The number of currently active font. :param font_table: Dictionary of fonts and respective encodings. :param default_encoding: The default encoding to use when font_table is empty or no font is used. :param failed: A boolean indicating whether the previous encoding didn't work. """ encoding = None if font in font_table: encoding = font_table[font] if not encoding and default_encoding: encoding = default_encoding if not encoding or failed: encoding = retrieve_windows_encoding() default_encoding = encoding font_table[font] = encoding return encoding, default_encoding
[docs]def strip_rtf(text, default_encoding=None): """ This function strips RTF control structures and returns an unicode string. Thanks to Markus Jarderot (MizardX) for this code, used by permission. http://stackoverflow.com/questions/188545 :param text: RTF-encoded text, a string. :param default_encoding: Default encoding to use when no encoding is specified. :return: A tuple ``(text, encoding)`` where ``text`` is the clean text and ``encoding`` is the detected encoding """ # Current font is the font tag we last met. font = '' # Character encoding is defined inside fonttable. # font_table could contain eg '0': u'cp1252' font_table = {'': ''} # Stack of things to keep track of when entering/leaving groups. stack = [] # Whether this group (and all inside it) are "ignorable". ignorable = False # Number of ASCII characters to skip after an unicode character. ucskip = 1 # Number of ASCII characters left to skip. curskip = 0 # Output buffer. out = [] # Encoded buffer. ebytes = bytearray() for match in PATTERN.finditer(text): iinu, word, arg, hex_, char, brace, tchar = match.groups() # \x (non-alpha character) if char: if char in '\\{}': tchar = char else: word = char # Flush encoded buffer to output buffer if ebytes and not hex_ and not tchar: failed = False while True: try: encoding, default_encoding = get_encoding(font, font_table, default_encoding, failed=failed) if not encoding: return None dbytes = ebytes.decode(encoding) # Code 5C is a peculiar case with Windows Codepage 932 if encoding == 'cp932' and '\\' in dbytes: dbytes = dbytes.replace('\\', '\u00A5') out.append(dbytes) ebytes.clear() except UnicodeDecodeError: failed = True else: break # {} if brace: curskip = 0 if brace == '{': # Push state stack.append((ucskip, ignorable, font)) elif brace == '}' and len(stack) > 0: # Pop state ucskip, ignorable, font = stack.pop() # \command elif word: curskip = 0 if word in DESTINATIONS: ignorable = True elif word in SPECIAL_CHARS: if not ignorable: out.append(SPECIAL_CHARS[word]) elif word == 'uc': ucskip = int(arg) elif word == 'u': c = int(arg) if c < 0: c += 0x10000 if not ignorable: out.append(chr(c)) curskip = ucskip elif word == 'fonttbl': ignorable = True elif word == 'f': font = arg elif word == 'ansicpg': font_table[font] = 'cp' + arg elif word == 'fcharset' and font not in font_table and arg in CHARSET_MAPPING: font_table[font] = CHARSET_MAPPING[arg] elif word == 'fldrslt': pass # \* 'Ignore if not understood' marker elif iinu: ignorable = True # \'xx elif hex_: if curskip > 0: curskip -= 1 elif not ignorable: ebytes.append(int(hex_, 16)) elif tchar: if not ignorable: ebytes += tchar.encode() if len(ebytes) >= curskip: ebytes = ebytes[curskip:] else: curskip -= len(ebytes) ebytes = "" text = ''.join(out) return text, default_encoding
[docs]def delete_song(song_id, song_plugin): """ Deletes a song from the database. Media files associated to the song are removed prior to the deletion of the song. :param song_id: The ID of the song to delete. :param song_plugin: The song plugin instance. """ save_path = '' media_files = song_plugin.manager.get_all_objects(MediaFile, MediaFile.song_id == song_id) for media_file in media_files: try: os.remove(media_file.file_name) except OSError: log.exception('Could not remove file: {name}'.format(name=media_file.file_name)) try: save_path = os.path.join(AppLocation.get_section_data_path(song_plugin.name), 'audio', str(song_id)) if os.path.exists(save_path): os.rmdir(save_path) except OSError: log.exception('Could not remove directory: {path}'.format(path=save_path)) song_plugin.manager.delete_object(Song, song_id)
[docs]def transpose_lyrics(lyrics, transepose_value): """ Transepose lyrics :param lyrcs: The lyrics to be transposed :param transepose_value: The value to transpose the lyrics with :return: The transposed lyrics """ # Split text by verse delimiter - both normal and optional verse_list = re.split('(---\[.+?:.+?\]---|\[---\])', lyrics) transposed_lyrics = '' notation = Settings().value('songs/chord notation') for verse in verse_list: if verse.startswith('---[') or verse == '[---]': transposed_lyrics += verse else: transposed_lyrics += transpose_verse(verse, transepose_value, notation) return transposed_lyrics
[docs]def transpose_verse(verse_text, transepose_value, notation): """ Transepose lyrics :param lyrcs: The lyrics to be transposed :param transepose_value: The value to transpose the lyrics with :return: The transposed lyrics """ if '[' not in verse_text: return verse_text # Split the lyrics based on chord tags lyric_list = re.split('(\[|\]|/)', verse_text) transposed_lyrics = '' in_tag = False for word in lyric_list: if not in_tag: transposed_lyrics += word if word == '[': in_tag = True else: if word == ']': in_tag = False transposed_lyrics += word elif word == '/': transposed_lyrics += word else: # This MUST be a chord transposed_lyrics += transpose_chord(word, transepose_value, notation) # If still inside a chord tag something is wrong! if in_tag: return verse_text else: return transposed_lyrics
[docs]def transpose_chord(chord, transpose_value, notation): """ Transpose chord according to the notation used. NOTE: This function has a javascript equivalent in chords.js - make sure to update both! :param chord: The chord to transpose. :param transpose_value: The value the chord should be transposed. :param notation: The notation to use when transposing. :return: The transposed chord. """ # See https://en.wikipedia.org/wiki/Musical_note#12-tone_chromatic_scale notes_sharp_notation = {} notes_flat_notation = {} notes_sharp_notation['german'] = ['C', 'C#', 'D', 'D#', 'E', 'F', 'F#', 'G', 'G#', 'A', 'A#', 'H'] notes_flat_notation['german'] = ['C', 'Db', 'D', 'Eb', 'Fb', 'F', 'Gb', 'G', 'Ab', 'A', 'B', 'H'] notes_sharp_notation['english'] = ['C', 'C#', 'D', 'D#', 'E', 'F', 'F#', 'G', 'G#', 'A', 'A#', 'B'] notes_flat_notation['english'] = ['C', 'Db', 'D', 'Eb', 'Fb', 'F', 'Gb', 'G', 'Ab', 'A', 'Bb', 'B'] notes_sharp_notation['neo-latin'] = ['Do', 'Do#', 'Re', 'Re#', 'Mi', 'Fa', 'Fa#', 'Sol', 'Sol#', 'La', 'La#', 'Si'] notes_flat_notation['neo-latin'] = ['Do', 'Reb', 'Re', 'Mib', 'Fab', 'Fa', 'Solb', 'Sol', 'Lab', 'La', 'Sib', 'Si'] chord_split = chord.replace('♭', 'b').split('/') transposed_chord = '' last_chord = '' notes_sharp = notes_sharp_notation[notation] notes_flat = notes_flat_notation[notation] notes_preferred = ['b', '#', '#', '#', '#', '#', '#', '#', '#', '#', '#', '#'] for i in range(0, len(chord_split)): if i > 0: transposed_chord += '/' currentchord = chord_split[i] if currentchord and currentchord[0] == '(': transposed_chord += '(' if len(currentchord) > 1: currentchord = currentchord[1:] else: currentchord = '' if len(currentchord) > 0: if len(currentchord) > 1: if '#b'.find(currentchord[1]) == -1: note = currentchord[0:1] rest = currentchord[1:] else: note = currentchord[0:2] rest = currentchord[2:] else: note = currentchord rest = '' notenumber = notes_flat.index(note) if note not in notes_sharp else notes_sharp.index(note) notenumber += transpose_value while notenumber > 11: notenumber -= 12 while notenumber < 0: notenumber += 12 if i == 0: current_chord = notes_sharp[notenumber] if notes_preferred[notenumber] == '#' else notes_flat[ notenumber] last_chord = current_chord else: current_chord = notes_flat[notenumber] if last_chord not in notes_sharp else notes_sharp[notenumber] if not (note not in notes_flat and note not in notes_sharp): transposed_chord += current_chord + rest else: transposed_chord += note + rest return transposed_chord