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# This file is part of the Frescobaldi project, http://www.frescobaldi.org/
#
# Copyright (c) 2008, 2009, 2010 by Wilbert Berendsen
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
# See http://www.gnu.org/licenses/ for more information.
from __future__ import unicode_literals
import re
from fractions import Fraction
import ly
class Pitch(object):
"""
A pitch with note, alter, octave and cautionary and octaveCheck
(for relative pitches)
"""
def __init__(self):
self.note = 0 # base note (c, d, e, f, g, a, b)
self.alter = 0 # # = 2; b = -2; natural = 0
self.octave = 0 # '' = 2; ,, = -2
self.cautionary = '' # '!' or '?' or ''
self.octaveCheck = None
@classmethod
def c1(cls):
""" Return a pitch c' """
p = cls()
p.octave = 1
return p
@classmethod
def c0(cls):
""" Return a pitch c """
return cls()
def copy(self):
""" Return a new instance with our attributes. """
p = self.__class__()
p.note = self.note
p.alter = self.alter
p.octave = self.octave
p.cautionary = self.cautionary
p.octaveCheck = self.octaveCheck
return p
def absolute(self, lastPitch):
"""
Set our octave height from lastPitch (which is absolute), as if
we are a relative pitch. If the octaveCheck attribute is set to an
octave number, that is used instead.
"""
if self.octaveCheck is not None:
self.octave = self.octaveCheck
self.octaveCheck = None
else:
dist = self.note - lastPitch.note
if dist > 3:
dist -= 7
elif dist < -3:
dist += 7
self.octave += lastPitch.octave + (lastPitch.note + dist) // 7
def relative(self, lastPitch):
"""
Returns a new Pitch instance with the current pitch relative to
the absolute pitch in lastPitch.
"""
p = self.copy()
dist = self.note - lastPitch.note
p.octave = self.octave - lastPitch.octave + (dist + 3) // 7
return p
def output(self, language):
"""
Return the pitch as a string in the given pitch name language.
Raises ly.QuarterToneAlterationNotAvailable is an alteration is
requested that is not available in that language.
"""
output = [pitchWriter[language](self.note, self.alter),
octaveToString(self.octave),
self.cautionary]
if self.octaveCheck is not None:
output.append('=' + octaveToString(self.octaveCheck))
return ''.join(output)
class Transposer(object):
"""
Transpose pitches.
Instantiate with a from- and to-Pitch, and optionally a scale.
The scale is a list with the pitch height of the unaltered step (0 .. 6).
The default scale is the normal scale: C, D, E, F, G, A, B.
"""
scale = (0, 1, 2, Fraction(5, 2), Fraction(7, 2), Fraction(9, 2), Fraction(11, 2))
def __init__(self, fromPitch, toPitch, scale = None):
if scale is not None:
self.scale = scale
# the number of octaves we need to transpose
self.octave = toPitch.octave - fromPitch.octave
# the number of base note steps (c->d == 1, e->f == 1, etc.)
self.steps = toPitch.note - fromPitch.note
# the number (fraction) of real whole steps
self.alter = (self.scale[toPitch.note] + toPitch.alter -
self.scale[fromPitch.note] - fromPitch.alter)
def transpose(self, pitch):
doct, note = divmod(pitch.note + self.steps, 7)
pitch.alter += self.alter - doct * 6 - self.scale[note] + self.scale[pitch.note]
pitch.octave += self.octave + doct
pitch.note = note
class PitchWriter(object):
def __init__(self, names, accs, replacements=()):
self.names = names
self.accs = accs
self.replacements = replacements
def __call__(self, note, alter = 0):
"""
Returns a string representing the pitch in our language.
Raises ly.QuarterToneAlterationNotAvailable if the requested pitch
has an alteration that is not available in the current language.
"""
pitch = self.names[note]
if alter:
acc = self.accs[int(alter * 4 + 4)]
if not acc:
raise ly.QuarterToneAlterationNotAvailable
pitch += acc
for s, r in self.replacements:
if pitch.startswith(s):
pitch = r + pitch[len(s):]
break
return pitch
class PitchReader(object):
def __init__(self, names, accs, replacements=()):
self.names = list(names)
self.accs = list(accs)
self.replacements = replacements
self.rx = re.compile("({0})({1})?$".format("|".join(names),
"|".join(acc for acc in accs if acc)))
def __call__(self, text):
for s, r in self.replacements:
if text.startswith(r):
text = s + text[len(r):]
for dummy in 1, 2:
m = self.rx.match(text)
if m:
note = self.names.index(m.group(1))
if m.group(2):
alter = Fraction(self.accs.index(m.group(2)) - 4, 4)
else:
alter = 0
return note, alter
# HACK: were we using (rarely used) long english syntax?
text = text.replace('flat', 'f').replace('sharp', 's')
return False
def octaveToString(octave):
"""
Convert numeric octave to a string with apostrophes or commas.
0 -> "" ; 1 -> "'" ; -1 -> "," ; etc.
"""
return octave < 0 and ',' * -octave or "'" * octave
def octaveToNum(octave):
"""
Convert string octave to an integer:
"" -> 0 ; "," -> -1 ; "'''" -> 3 ; etc.
"""
return octave.count("'") - octave.count(",")
pitchInfo = {
'nederlands': (
('c','d','e','f','g','a','b'),
('eses', 'eseh', 'es', 'eh', '', 'ih','is','isih','isis'),
(('ees', 'es'), ('aes', 'as'))
),
'english': (
('c','d','e','f','g','a','b'),
('ff', 'tqf', 'f', 'qf', '', 'qs', 's', 'tqs', 'ss'),
),
'deutsch': (
('c','d','e','f','g','a','h'),
('eses', 'eseh', 'es', 'eh', '', 'ih','is','isih','isis'),
(('ees', 'es'), ('aes', 'as'), ('hes', 'b'))
),
'svenska': (
('c','d','e','f','g','a','h'),
('essess', '', 'ess', '', '', '','iss','','ississ'),
(('ees', 'es'), ('aes', 'as'), ('hess', 'b'))
),
'italiano': (
('do', 're', 'mi', 'fa', 'sol', 'la', 'si'),
('bb', 'bsb', 'b', 'sb', '', 'sd', 'd', 'dsd', 'dd')
),
'espanol': (
('do', 're', 'mi', 'fa', 'sol', 'la', 'si'),
('bb', '', 'b', '', '', '', 's', '', 'ss')
),
'portugues': (
('do', 're', 'mi', 'fa', 'sol', 'la', 'si'),
('bb', 'btqt', 'b', 'bqt', '', 'sqt', 's', 'stqt', 'ss')
),
'vlaams': (
('do', 're', 'mi', 'fa', 'sol', 'la', 'si'),
('bb', '', 'b', '', '', '', 'k', '', 'kk')
),
}
pitchInfo['norsk'] = pitchInfo['deutsch']
pitchInfo['suomi'] = pitchInfo['deutsch']
pitchInfo['catalan'] = pitchInfo['italiano']
pitchWriter = dict(
(lang, PitchWriter(*data)) for lang, data in pitchInfo.iteritems())
pitchReader = dict(
(lang, PitchReader(*data)) for lang, data in pitchInfo.iteritems())
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