annotate Syncopation models/rhythm_parser.py @ 20:b959c2acb927

Refactored all models except for KTH, all past testing except for SG.

'''
Author: Chunyang Song
Institution: Centre for Digital Music, Queen Mary University of London
'''

# Parse the rhythm file and return a list of Bar objects
Piece = []

from parameter_setter import timeSignatureBase


comment_sign = '#'
def discardComments(line):
	if comment_sign in line:
		line = line[0:line.find(comment_sign)]
	return line

def discardSpaces(line):
	line = line.replace(" ", '').replace("\t", '')
	return line

def extractInfo(line):
	try:
		if '{' not in line and '}' not in line:
			raise RhythmSyntaxError(line)
		else:
			return line[line.find('{')+1 : line.find('}')]
	except RhythmSyntaxError:
		print 'Rhythmic information needs to be enclosed by "{" and "}"'


current_timesig = ''
current_timesigValue = []
def process(line):
	try:
		if 't' in line:
			current_timesig = extractInfo(line)
			if current_timesig in timesigBase:
				current_timesigValue = timesigBase[current_timesig]
			else:
				raise NoTimesigError(current_timesig)
		
		elif 'v' in line:
			if current_timesig == '':
				raise InitialTimesigError(line)
			else:
				rhythmString = extractInfo(line)
				rhythm_seq = map(int,rhythmString.split(','))
				Piece.append(Bar(rhythm_seq, current_timesigValue[0], current_timesigValue[1]))
		
		else:
			raise SymbolError(line)
	
	except InitialTimesigError:
		print 'The initial time-signature is not given.'
	except NoTimesigError:
		print 'The time-signature is not recognised.'
	except SymbolError:
		print 'Unrecognised symbol.'


def readRhythm(fileName):
	try:
		f = file(fileName)
		
		# Clean up each line by discarding comments and spaces; extract time-signature or sequence information
		isfinished = False
		while(not isfinished):
			line = f.readline()
			if len(line) == 0:
				isfinished = True
			else:
				cleanline = discardSpaces(discardComments(line))
				process(cleanline)

		# Extract time-signature and rhythm sequence information

	except IOError as e:
		print "I/O error({0}): {1}".format(e.errno, e.strerror)
	except:
		print 'Unexpected error.'#, sys.exc_info()[0]

# To check the 
def isInfoValid(info):
	# If two parts of information is not seperated by ;
	# if 't' in info and 'q' in info:
	# 	print 'Error: time-signature and rhythm sequence needs ";" to seperate. Please check this rhythm file: %s.' %fileName
	# 	Piece = None
	# 	break
	# elif '{' not in info and '}' not in info:
	# 	print 'Error: information needs to be enclosed by "{ }". Please check this rhythm file: %s.' %fileName
	# 	Piece = None
	# 	break				
	# else:
	return True			

# To check whether the given time-signature is existed; if not then requires user to add in the new time-signature
#def checkTimesig(input):


# # TESTING
# line = 't{4/4}	q{1,0,0,1,0,0,1,0,0,0,1,0,0.8,0,0,0} t{2/4} # This is a comment'
# # print discardSpaces(discardComments(line))
# print line[line.find('{')+1:line.find('}')]
# #print readRhythm("rhythmbase/testrhythm.txt")