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# trigger.py
"""
This module is an integeral part of the program
MMA - Musical Midi Accompaniment.
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Bob van der Poel <bob@mellowood.ca>
All trigger functions.
"""
from MMA.common import *
import MMA.debug
from . import gbl
import MMA.truncate
import random
import copy
# Each track class has a pointer to a unique copy of this object
class Trigger:
def __init__(self):
self.mode = None
self.truncate = False
self.count = 1
self.bars = []
self.beats = []
self.seq = None
self.measures = []
self.cnames = []
self.ctonics = []
self.ctypes = []
self.override = False
def makeTriggerSequence(self, ctable, pattern):
""" Create a new sequence based on a trigger setting.
This is called only from bar().
"""
trigger = self.trigger
if trigger.bars and gbl.seqCount not in trigger.bars:
return []
if trigger.measures and gbl.barLabel not in trigger.measures:
return []
# Use the internal trigger sequence if it's set.
# otherwise, use the pattern(s) from the
# sequence set for the track.
if trigger.seq:
pattern = trigger.seq
# Not redundant!
if not pattern:
return []
tpats = []
# If we have trigger set to "AUTO" then we create a set of offsets
# based on the chord changes in ctable.
if trigger.mode == 'AUTO':
trigs = []
for c in ctable:
if c.name != 'z' and c.name != c.lastchord:
trigs.append(c.chStart)
# This works with 'z' chords only, not 'XXzYY'
elif trigger.mode == 'REST':
trigs = []
for c in ctable:
if c.name == 'z' and c.name != c.lastchord:
trigs.append(c.chStart)
# different 'beat' combinations
elif trigger.mode == 'BEATS':
# If chord names are set set if the beat and the
# chord NAME at that point
if trigger.cnames:
trigs = []
for t in trigger.beats:
for c in ctable:
if t >= c.chStart and t < c.chEnd and \
c.chord.name in trigger.cnames:
trigs.append(t)
break
# Chord tonic names (C, D, E ... G)
elif trigger.ctonics:
trigs = []
for t in trigger.beats:
for c in ctable:
if t >= c.chStart and t < c.chEnd and \
c.chord.tonic in trigger.ctonics:
trigs.append(t)
break
elif trigger.ctypes:
trigs = []
for t in trigger.beats:
for c in ctable:
if t >= c.chStart and t < c.chEnd and \
c.chord.chordType in trigger.ctypes:
trigs.append(t)
break
# use the user defined beat list
else:
trigs = trigger.beats
else:
return []
# make copies of pattern(s) for each beat.
# the number of patterns to copy are determined by the 'count'
# option (default==1).
c = min(len(pattern), trigger.count)
if c < 1: # either no pattern or no count
return []
for t in trigs:
for i in range(c):
base = copy.deepcopy(pattern[i])
base.offset += t
if base.offset >= gbl.barLen:
continue
tpats.append(base)
# normalize the durations of the new patterns so they
# terminate at the next pattern or the end of the bar
if trigger.truncate:
for i in range(len(tpats)):
if i < len(tpats) - 1: # another chord follows, truncate at start of next chord
maxd = tpats[i+1].offset - tpats[i].offset
else: # last chord, truncate at end of bar
# Note to braindead self, the TRUNCATE option is
# used to shorten a bar's duration. So the end of
# bar can be 'gbl.barlen' or 'truncate.length'
if MMA.truncate.length:
barEnd = MMA.truncate.length
else:
barEnd = gbl.barLen
maxd = barEnd - tpats[i].offset
tpats[i].duration = min(tpats[i].duration, maxd)
return tpats
def setTrigger(name, ln):
""" Set a trigger for a track.
A trigger is simply a list of offsets which are processed
by the trackBar() functions for each track.
This is called from the parser. We grab the track class from 'name'.
"""
self = gbl.tnames[name]
if self.vtype in ('MELODY', 'SOLO'):
error("Trigger is not valid in %s track." % self.vtype)
self.trigger = trigger = Trigger() # always reset to default
sequence = None
if not ln: # empty line is same as singleton 'off'
ln = ['OFF']
argCount = len(ln)
trigger.mode = 'ON'
# extract a possible sequence. Only 1st is extracted and
# saved for use by the 'SEQUENCE = ' command. The stuff in {}
# is replaced by an empty {}.
l = ' '.join(ln)
if '{' in l and '}' in l:
ln, sequence = pextract(l, '{', '}', onlyone=True, insert='{}')
ln = ln.split()
sequence = sequence[0]
ln, opts = opt2pair(ln)
##########################
# do opts with args
for cmd, opt in opts:
cmd = cmd.upper()
if cmd == 'BEATS':
trigger.mode = 'BEATS'
for t in opt.split(','):
trigger.beats.append(self.setBarOffset(t))
trigger.beats.sort()
elif cmd == 'BARS':
for t in opt.split(','):
v = stoi(t)
if v < 1 or v > gbl.seqSize:
warning("%s Trigger Bars: setting of %s may be "
"ignored since SeqSize is %s." %
(self.name, v, gbl.seqSize))
trigger.bars.append(v - 1)
elif cmd == 'CNAMES':
for a in opt.split(','):
trigger.cnames.append(a)
elif cmd == 'CTYPES':
for a in opt.split(','):
trigger.ctypes.append(a)
elif cmd == 'CTONICS':
for a in opt.split(','):
trigger.ctonics.append(a)
elif cmd == 'COUNT':
trigger.count = stoi(opt)
if trigger.count <= 0:
error("%s Trigger Count must be greater than 0, not '%s'." %
(self.name, trigger.count))
elif cmd == 'MEASURES':
for a in opt.split(','):
if not a.isdigit():
warning("%s Trigger: Measures should be bar labels, not '%s'."
"This trigger will be ignored." % (self.name, a))
continue
trigger.measures.append(a.lstrip('0'))
elif cmd == 'OVERRIDE':
trigger.override = getTF(opt, "Trigger 'OverRide'")
elif cmd == 'TRUNCATE':
trigger.truncate = getTF(opt, "Trigger 'Turncate'")
elif cmd == 'SEQUENCE':
if not sequence and opt:
sequence = opt
if sequence:
sequence = sequence.rstrip('; ')
trigger.seq = self.defPatRiff(sequence)
else:
error("%s Trigger Sequence expecting {patterns...}." % self.name)
elif cmd == 'STICKY':
self.sticky = getTF(opt, "Trigger 'Sticky'")
else:
error("%s Trigger '%s' is an unknown command." % (self.name, cmd))
# opts without args
for cmd in ln:
cmd = cmd.upper()
if cmd == 'AUTO':
trigger.mode = 'AUTO'
elif cmd == 'OFF': # It's all been set to default at top, so leave it alone
if argCount > 1:
error("Trigger: 'OFF' argument must be the only arg.")
elif cmd == 'REST':
trigger.mode = 'REST'
else:
error("%s Trigger '%s' is an unknown command." % (self.name, cmd))
if MMA.debug.debug:
MMA.debug.trackSet(self.name, "TRIGGER")
def getTriggerOptions(self):
""" Called from setTrigger() and macro. Returns string with current options. """
trigger = self.trigger
mode = ''
if trigger.mode in ('AUTO', 'REST'):
mode = trigger.mode
if not trigger.beats:
beats = '[]'
else:
beats = ','.join([str(1 + (i / float(gbl.BperQ))) for i in trigger.beats])
if trigger.cnames:
cnames = ','.join([i for i in trigger.cnames])
else:
cnames = '[]'
if trigger.ctypes:
ctypes = ','.join([i for i in trigger.ctypes])
else:
ctypes = '[]'
if trigger.ctonics:
tonics = ','.join([i for i in trigger.ctonics])
else:
tonics = '[]'
if not trigger.bars:
bars = '[]'
else:
bars = ','.join([str(a + 1) for a in trigger.bars])
if trigger.seq:
seq = "Sequence={%s}" % self.formatPattern(trigger.seq)
else:
seq = "Sequence={}"
if trigger.measures:
measures = ','.join([i for i in trigger.measures])
else:
measures = '[]'
return "%s Beats=%s CNames=%s CTypes=%s CTonics=%s Bars=%s " \
"Count=%s Truncate=%s Override=%s Measures=%s %s" % \
( mode, beats, cnames, ctypes, tonics, bars, trigger.count,
trigger.truncate, trigger.override, measures, seq)
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