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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
"""
All kinds of tools needed to manipulate strings with LilyPond input.
"""
import ly.pitch
import ly.tokenize
class Pitch(ly.pitch.Pitch):
@classmethod
def fromToken(cls, token, tokenizer):
result = tokenizer.readStep(token)
if result:
p = cls()
p.note, p.alter = result
p.octave = ly.pitch.octaveToNum(token.octave)
p.cautionary = token.cautionary
if token.octcheck:
p.octaveCheck = ly.pitch.octaveToNum(token.octcheck)
return p
def relativeToAbsolute(text, start = 0, changes = None):
"""
Convert \relative { } music to absolute pitches.
Returns a ChangeList instance that contains the changes.
"""
tokenizer = ly.tokenize.MusicTokenizer()
tokens = tokenizer.tokens(text)
# Walk through not-selected text, to track the state and the
# current pitch language.
if start:
for token in tokens:
if token.end >= start:
break
if changes is None:
changes = ly.tokenize.ChangeList(text)
def newPitch(token, pitch, lastPitch):
"""
Writes a new pitch with all parts except the octave taken from the
token. The octave is set using lastPitch.
"""
pitch.absolute(lastPitch)
changes.replaceToken(token,
token.step + ly.pitch.octaveToString(pitch.octave) + token.cautionary)
class gen(object):
"""
Advanced generator of tokens, discarding whitespace and comments,
and automatically detecting \relative blocks and places where a new
LilyPond parsing context is started, like \score inside \markup.
"""
def __iter__(self):
return self
def next(self):
token = next(tokens)
while isinstance(token, (tokenizer.Space, tokenizer.Comment)):
token = next(tokens)
if token == "\\relative":
relative(token.pos)
token = next(tokens)
elif isinstance(token, tokenizer.MarkupScore):
absolute()
token = next(tokens)
return token
source = gen()
def consume():
""" Consume tokens till the level drops (we exit a construct). """
depth = tokenizer.depth()
for token in source:
yield token
if tokenizer.depth() < depth:
return
def absolute():
""" Consume tokens while not doing anything. """
for token in consume():
pass
def relative(start):
"""
Called when a \\relative command is encountered.
start is the position of the \\relative token, to remove it later.
"""
# find the pitch after the \relative command
lastPitch = None
token = next(source)
if isinstance(token, tokenizer.Pitch):
lastPitch = Pitch.fromToken(token, tokenizer)
token = next(source)
if not lastPitch:
lastPitch = Pitch.c1()
# remove the \relative <pitch> tokens
changes.remove(start, token.pos)
# eat stuff like \new Staff == "bla" \new Voice \notes etc.
while True:
if token in ('\\new', '\\context'):
next(source) # skip context type
token = next(source)
if token == '=':
next(source) # skip context name
token = next(source)
elif isinstance(token, (tokenizer.ChordMode, tokenizer.NoteMode)):
token = next(source)
else:
break
# now convert the relative expression to absolute
if isinstance(token, tokenizer.OpenDelimiter):
# Handle full music expression { ... } or << ... >>
for token in consume():
# skip commands with pitches that do not count
if token in ('\\key', '\\transposition'):
next(source)
elif token == '\\transpose':
next(source)
next(source)
elif token == '\\octaveCheck':
start = token.pos
token = next(source)
if isinstance(token, tokenizer.Pitch):
p = Pitch.fromToken(token, tokenizer)
if p:
lastPitch = p
changes.remove(start, token.end)
elif isinstance(token, tokenizer.OpenChord):
# handle chord
chord = [lastPitch]
for token in source:
if isinstance(token, tokenizer.CloseChord):
lastPitch = chord[:2][-1] # same or first
break
elif isinstance(token, tokenizer.Pitch):
p = Pitch.fromToken(token, tokenizer)
if p:
newPitch(token, p, chord[-1])
chord.append(p)
elif isinstance(token, tokenizer.Pitch):
p = Pitch.fromToken(token, tokenizer)
if p:
newPitch(token, p, lastPitch)
lastPitch = p
elif isinstance(token, tokenizer.OpenChord):
# Handle just one chord
for token in source:
if isinstance(token, tokenizer.CloseChord):
break
elif isinstance(token, tokenizer.Pitch):
p = Pitch.fromToken(token, tokenizer)
if p:
newPitch(token, p, lastPitch)
lastPitch = p
elif isinstance(token, tokenizer.Pitch):
# Handle just one pitch
p = Pitch.fromToken(token, tokenizer)
if p:
newPitch(token, p, lastPitch)
# Do it!
for token in source:
pass
return changes
def absoluteToRelative(text, start = 0, changes = None):
"""
Converts the selected music expression or all toplevel expressions to \relative ones.
"""
tokenizer = ly.tokenize.MusicTokenizer()
tokens = tokenizer.tokens(text)
# Walk through not-selected text, to track the state and the
# current pitch language.
if start:
for token in tokens:
if token.end >= start:
break
if changes is None:
changes = ly.tokenize.ChangeList(text)
def newPitch(token, pitch):
"""
Writes a new pitch with all parts except the octave taken from the
token.
"""
changes.replaceToken(token,
token.step + ly.pitch.octaveToString(pitch.octave) + token.cautionary)
class gen(object):
"""
Advanced generator of tokens, discarding whitespace and comments,
and automatically detecting \relative blocks and places where a new
LilyPond parsing context is started, like \score inside \markup.
"""
def __iter__(self):
return self
def next(self):
token = next(tokens)
while isinstance(token, (tokenizer.Space, tokenizer.Comment)):
token = next(tokens)
if token == "\\relative":
relative()
token = next(tokens)
elif isinstance(token, tokenizer.ChordMode):
absolute() # do not change chords
elif isinstance(token, tokenizer.MarkupScore):
absolute()
token = next(tokens)
return token
source = gen()
def consume():
""" Consume tokens till the level drops (we exit a construct). """
depth = tokenizer.depth()
for token in source:
yield token
if tokenizer.depth() < depth:
return
def absolute():
""" Consume tokens while not doing anything. """
for token in consume():
pass
def relative():
""" Consume the whole \relative expression without doing anything. """
# skip pitch argument
token = next(source)
if isinstance(token, tokenizer.Pitch):
token = next(source)
if isinstance(token, tokenizer.OpenDelimiter):
for token in consume():
pass
elif isinstance(token, tokenizer.OpenChord):
while not isinstance(token, tokenizer.CloseChord):
token = next(source)
# Do it!
startToken = None
for token in source:
if isinstance(token, tokenizer.OpenDelimiter):
# Ok, parse current expression.
startToken = token # before which to insert the \relative command
lastPitch = None
chord = None
try:
for token in consume():
# skip commands with pitches that do not count
if token in ('\\key', '\\transposition'):
next(source)
elif token == '\\transpose':
next(source)
next(source)
elif isinstance(token, tokenizer.OpenChord):
# Handle chord
chord = []
elif isinstance(token, tokenizer.CloseChord):
if chord:
lastPitch = chord[0]
chord = None
elif isinstance(token, tokenizer.Pitch):
# Handle pitch
p = Pitch.fromToken(token, tokenizer)
if p:
if lastPitch is None:
lastPitch = Pitch.c1()
lastPitch.octave = p.octave
if p.note > 3:
lastPitch.octave += 1
changes.insert(startToken.pos,
"\\relative {0} ".format(
lastPitch.output(tokenizer.language)))
newPitch(token, p.relative(lastPitch))
lastPitch = p
# remember the first pitch of a chord
chord == [] and chord.append(p)
except StopIteration:
pass # because of the next(source) statements
if startToken is None: # no single expression converted?
raise ly.NoMusicExpressionFound
return changes
def languageAndKey(text):
"""
Return language and key signature pitch (as Pitch) of text.
"""
tokenizer = ly.tokenize.MusicTokenizer()
tokens = iter(tokenizer.tokens(text))
keyPitch = Pitch.c0()
for token in tokens:
if token == "\\key":
for token in tokens:
if not isinstance(token, (tokenizer.Space, tokenizer.Comment)):
break
if isinstance(token, tokenizer.Pitch):
p = Pitch.fromToken(token, tokenizer)
if p:
keyPitch = p
keyPitch.octave = 0
return tokenizer.language, keyPitch
def transpose(text, transposer, start = 0, changes = None):
"""
Transpose all or selected pitches.
Raises ly.QuarterToneAlterationNotAvailable if quarter tones are
requested but not available in the current language.
"""
tokenizer = ly.tokenize.MusicTokenizer()
tokens = tokenizer.tokens(text)
if changes is None:
changes = ly.tokenize.ChangeList(text)
class gen(object):
"""
Advanced generator of tokens, discarding whitespace and comments,
and automatically detecting \relative blocks and places where a new
LilyPond parsing context is started, like \score inside \markup.
It also handles transposition tasks that are the same in relative
and absolute environments.
"""
def __init__(self):
self.inSelection = not start
def __iter__(self):
return self
def next(self):
while True:
token = next(tokens)
if isinstance(token, (tokenizer.Space, tokenizer.Comment)):
continue
elif not self.inSelection and token.pos >= start:
self.inSelection = True
# Handle stuff that's the same in relative and absolute here
if token == "\\relative":
relative()
elif isinstance(token, tokenizer.MarkupScore):
absolute(consume())
elif isinstance(token, tokenizer.ChordMode):
chordmode()
elif token == "\\transposition":
next(source) # skip pitch
elif token == "\\transpose":
if self.inSelection:
for token in next(source), next(source):
if isinstance(token, tokenizer.Pitch):
transpose(token)
else:
next(source), next(source)
elif token == "\\key":
token = next(source)
if self.inSelection and isinstance(token, tokenizer.Pitch):
transpose(token, 0)
else:
return token
source = gen()
def consume():
""" Consume tokens till the level drops (we exit a construct). """
depth = tokenizer.depth()
for token in source:
yield token
if tokenizer.depth() < depth:
return
def transpose(token, resetOctave = None):
""" Transpose absolute pitch in token, must be tokenizer.Pitch """
p = Pitch.fromToken(token, tokenizer)
if p:
transposer.transpose(p)
if resetOctave is not None:
p.octave = resetOctave
changes.replaceToken(token, p.output(tokenizer.language))
def relative():
""" Called when \\relative is encountered. """
def transposeRelative(token, lastPitch):
"""
Make a new relative pitch from token, if possible.
Return the last pitch used (absolute, untransposed).
"""
p = Pitch.fromToken(token, tokenizer)
if not p:
return lastPitch
# absolute pitch determined from untransposed pitch of lastPitch
octaveCheck = p.octaveCheck is not None
p.absolute(lastPitch)
if source.inSelection:
# we may change this pitch. Make it relative against the
# transposed lastPitch.
try:
last = lastPitch.transposed
except AttributeError:
last = lastPitch
# transpose a copy and store that in the transposed
# attribute of lastPitch. Next time that is used for
# making the next pitch relative correctly.
copy = p.copy()
transposer.transpose(copy)
p.transposed = copy # store transposed copy in new lastPitch
new = copy.relative(last)
if octaveCheck:
new.octaveCheck = copy.octave
if relPitchToken:
# we are allowed to change the pitch after the
# \relative command. lastPitch contains this pitch.
lastPitch.octave += new.octave
new.octave = 0
changes.replaceToken(relPitchToken[0], lastPitch.output(tokenizer.language))
del relPitchToken[:]
changes.replaceToken(token, new.output(tokenizer.language))
return p
lastPitch = None
relPitchToken = [] # we use a list so it can be changed from inside functions
# find the pitch after the \relative command
token = next(source)
if isinstance(token, tokenizer.Pitch):
lastPitch = Pitch.fromToken(token, tokenizer)
if lastPitch and source.inSelection:
relPitchToken.append(token)
token = next(source)
if not lastPitch:
lastPitch = Pitch.c1()
# eat stuff like \new Staff == "bla" \new Voice \notes etc.
while True:
if token in ('\\new', '\\context'):
next(source) # skip context type
token = next(source)
if token == '=':
next(source) # skip context name
token = next(source)
elif isinstance(token, tokenizer.NoteMode):
token = next(source)
else:
break
# now transpose the relative expression
if isinstance(token, tokenizer.OpenDelimiter):
# Handle full music expression { ... } or << ... >>
for token in consume():
if token == '\\octaveCheck':
token = next(source)
if isinstance(token, tokenizer.Pitch):
p = Pitch.fromToken(token, tokenizer)
if p:
if source.inSelection:
copy = p.copy()
transposer.transpose(copy)
p.transposed = copy
changes.replaceToken(token, copy.output(tokenizer.language))
lastPitch = p
del relPitchToken[:]
elif isinstance(token, tokenizer.OpenChord):
chord = [lastPitch]
for token in source:
if isinstance(token, tokenizer.CloseChord):
lastPitch = chord[:2][-1] # same or first
break
elif isinstance(token, tokenizer.Pitch):
chord.append(transposeRelative(token, chord[-1]))
elif isinstance(token, tokenizer.Pitch):
lastPitch = transposeRelative(token, lastPitch)
elif isinstance(token, tokenizer.OpenChord):
# Handle just one chord
for token in source:
if isinstance(token, tokenizer.CloseChord):
break
elif isinstance(token, tokenizer.Pitch):
lastPitch = transposeRelative(token, lastPitch)
elif isinstance(token, tokenizer.Pitch):
# Handle just one pitch
transposeRelative(token, lastPitch)
def chordmode():
""" Called inside \\chordmode or \\chords. """
for token in consume():
if source.inSelection and isinstance(token, tokenizer.Pitch):
transpose(token, 0)
def absolute(tokens):
""" Called when outside a possible \\relative environment. """
for token in tokens:
if source.inSelection and isinstance(token, tokenizer.Pitch):
transpose(token)
# Do it!
absolute(source)
return changes
def translate(text, lang, start = 0, changes = None):
"""
Change the LilyPond pitch name language in our document to lang.
Raises ly.QuarterToneAlterationNotAvailable if quarter tones are
requested but not available in the target language.
"""
tokenizer = ly.tokenize.Tokenizer()
tokens = tokenizer.tokens(text)
# Walk through not-selected text, to track the state and the
# current pitch language.
if start:
for token in tokens:
if token.end >= start:
break
if changes is None:
changes = ly.tokenize.ChangeList(text)
writer = ly.pitch.pitchWriter[lang]
reader = ly.pitch.pitchReader[tokenizer.language]
# Now walk through the part that needs to be translated.
includeCommandChanged = False
for token in tokens:
if isinstance(token, tokenizer.IncludeLanguageFile):
reader = ly.pitch.pitchReader[tokenizer.language]
changes.replaceToken(token, '"{0}.ly"'.format(lang))
includeCommandChanged = True
elif isinstance(token, tokenizer.PitchWord):
result = reader(token)
if result:
note, alter = result
# Write out the translated pitch.
changes.replaceToken(token, writer(note, alter))
return changes, includeCommandChanged
|
