# mdefine.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 <bvdp@xplornet.com>

This class is used to parse lines of MDEFINE and stores
the sequences for later recall.

"""

import gbl
from   MMA.common import *
import MMA.midiC
class Mdefine:

	def __init__(self):
		self.defs = {}

	def get(self, name):
		""" Return a predefine MIDI pattern."""

		try:
			return self.defs[name]
		except:
			error("The MDEFINE pattern %s has not been defined." % name)


	def set(self, name, ln):
		""" Parse a MDEFINE line.

			The line must be in the form:

				NAME <beat> <ctrl> <dat> [; ...]

		"""

		name = name.upper()

		ln=ln.rstrip('; ')	 # dump trailing ';' and whitespace
		ln = ln.split(';')
		evs = []
		for l in ln:
			l=l.split()

			if len(l) == 1:
				evs.extend( self.get(l[0].upper() ))
				continue

			if len(l) != 3:
				error("MDEFINE sequence must have 3 values: Beat, Ctrl, Datum")

			off=stof(l[0], "Value for offset must be integer/float")

			c=MMA.midiC.ctrlToValue(l[1])
			if c < 0:
				c=stoi(l[1])
				if c < 0 or c > 0x7f:
					error("Controller values must be 0x00 to 0x7f.")

			d=stoi(l[2])
			if d < 0 or d > 0x7f:
				error("MIDI Control Datum value must be 0x00 to 0x7f.")


			evs.append( [off, chr(c) + chr(d)])

		self.defs[name]=evs

mdef = Mdefine()