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# rangeify.py
"""
The program "MMA - Musical Midi Accompaniment" and the associated
modules distributed with it are protected by copyright.
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>
The following code is borrowed from
https://stackoverflow.com/questions/3429510
It has been modified to account for the MMA special
values of '?' indicating un-numbered lines and the
conversion of string values to integers.
"""
from itertools import count, groupby
def rangeify(l):
for i,v in enumerate(l):
try:
l[i]=int(v)
except ValueError:
l[i]=-987654321
G=(list(x) for _,x in groupby(l, lambda x,c=count(): next(c)-x))
ret = ", ".join("-".join(map(str,(g[0],g[-1])[:len(g)])) for g in G)
ret = ret.replace('-987654321', '?')
return ret
#print( rangeify(['1', '2', '?', '4', '?', '?', '4','5']))
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