#Joe Dorocak's small additions to kahman's :
#pyNWC-a .nwctxt syntax parser (I/O) in python
#Created by NWC forum user kahman.
#Use it however you please.  Feel free to modify it, but please return all modifications to the forum.
#See below for known bugs.
#If you want to "translate" it into another computer language, feel free to do so.  If you want to modify it, feel free to do so.
#Basically, what it does is you can give it a line of code and it will process it by | and :, so |Note|Dur:4th|Pos:0 becomes the line of code ['Note', {'Dur': '4th', 'Pos': '0'}]
#If anyone makes any modifications, post them here.
#At some point, someone should write a converter to/from MXML...sigh.
#Oh, and at some point, I'll work on a program to convert from this back to NWCTXT.
#If you find a bug, please post it here.
#Known bugs:
#   *Cannot import lyrics that have line-breaks in them.
"""
nwcTxtParse.py Translates NWCTextFormat to PythonListDictFormat

Usage:   nwcTxtParse.py infileName    outfileName
Example: nwcTxtParse.py mySong.nwctxt mySong.py
"""


def parsefile(_file):
    "parse one file"
    _file=_file.split('\n') #split the file by line
    for x in range(len(_file)):    #for each remaining line,
        _file[x]=parseline(_file[x])   #parse it seperately
    while 1:    #until error occurs
        try:
            _file.remove(None)  #remove a None from the list
        except ValueError:  #if there is no None,
            break   #break
    return _file

def parseline(line):
    "parse one line"
    output=[]
    if line=='':    #if line is blank,
        return None     #destroy it
    elif line[0]=='#':  #or if it's a comment,
        return None     #destroy it
    elif line[0]=='!':  #or if it's start/end marker,
        return None     #destroy it
    line=line.split('|')    #split the line by |
    output.append(line[1])   #set what object it is
    output.append({})
    for x in line[2:]:  #then for each property/value
        y=(x.split(':')) #split it into property and value
        output[1][y[0]]=y[1]    #and add these to the dictionary
    return output

def writefile(tree):
    "write a file"
    output='!NoteWorthyComposer(2.0)\n'   #start empty output
    for x in tree:  #for each line
        output=output+writeline(x)+'\n' #process it seperately
    output=output+'!NoteWorthyComposer-End'
    return output

def writeline(line):
    "write a line"
    output='|'  #start empty output
    output=output+line[0]
    for x in line[1].keys():
        output=output+'|%s:%s' %(x, line[1][x])
    return output


import sys

N_ARGS = 2  

def main(argv=None):
	if argv == None: argv=sys.argv
	args = argv[1:]  #NOTE: args[0] != argv[0] == <full path to example.py>
	if len(args) != N_ARGS or "-h" in args or "--help" in args:
		print __doc__
		sys.exit(2)
	
	f = open(args[0], 'r'); s = f.read(); f.close()        # get the input file into s
	s2 = parsefile(s)                                      # translate s into s2
	f = open(args[1], 'w'); f.write(str(s2)); f.close()    # write str(s2) into the output file
	print 'Translated ' + str(args[0]) + ' yielding ' + str(args[1])
	

if __name__ == '__main__':
	sys.exit(main())