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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
""" LilyPond information and logic concerning durations """
import ly.rx
durations = ['\\maxima', '\\longa', '\\breve',
'1', '2', '4', '8', '16', '32', '64', '128', '256', '512', '1024', '2048']
def editRhythm(func):
"""
Decorator to handle functions that are the callback for the regexp.
"""
def decorator(text):
def repl(m):
return m.group('duration') and func(m) or m.group()
return ly.rx.chord_rest.sub(repl, text)
return decorator
@editRhythm
def doubleDurations(m):
chord, dur, dots, scale = m.group('chord', 'dur', 'dots', 'scale')
if dur in durations:
i = durations.index(dur)
if i > 0:
dur = durations[i - 1]
return ''.join(i or '' for i in (chord, dur, dots, scale))
@editRhythm
def halveDurations(m):
chord, dur, dots, scale = m.group('chord', 'dur', 'dots', 'scale')
if dur in durations:
i = durations.index(dur)
if i < len(durations) - 1:
dur = durations[i + 1]
return ''.join(i or '' for i in (chord, dur, dots, scale))
@editRhythm
def dotDurations(m):
chord, dur, dots, scale = m.group('chord', 'dur', 'dots', 'scale')
dots = (dots or '') + '.'
return ''.join(i or '' for i in (chord, dur, dots, scale))
@editRhythm
def undotDurations(m):
chord, dur, dots, scale = m.group('chord', 'dur', 'dots', 'scale')
if dots:
dots = dots[1:]
return ''.join(i or '' for i in (chord, dur, dots, scale))
@editRhythm
def removeScaling(m):
return ''.join(i or '' for i in m.group('chord', 'dur', 'dots'))
@editRhythm
def removeDurations(m):
return m.group('chord')
def makeImplicit(text):
old = ['']
def repl(m):
chord, duration = m.group('chord', 'duration')
if chord:
if not duration or duration == old[0]:
return chord
else:
old[0] = duration
return chord + duration
return m.group()
return ly.rx.chord_rest.sub(repl, text)
def makeExplicit(text):
old = ['']
def repl(m):
chord, duration = m.group('chord', 'duration')
if chord:
if not duration:
return chord + old[0]
else:
old[0] = duration
return chord + duration
return m.group()
return ly.rx.chord_rest.sub(repl, text)
def applyRhythm(text, rhythm):
""" Adds the entered rhythm to the selected music."""
durs = [m.group() for m in ly.rx.finddurs.finditer(rhythm)]
if not durs:
return text
def durgen():
old = ''
while True:
for i in durs:
yield i != old and i or ''
old = i
durations = durgen()
def repl(m):
if m.group('chord'):
return m.group('chord') + next(durations)
return m.group()
return ly.rx.chord_rest.sub(repl, text)
def extractRhythm(text):
""" Iterate over a rhythm from text, returning only the durations """
duration = ''
for m in ly.rx.chord_rest.finditer(text):
if m.group('chord'):
if m.group('duration'):
duration = m.group('duration')
yield duration
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