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class License(object):
def __init__(self, name):
self.name = name
def __iter__(self):
yield self
def flatten(self):
yield self.name
def __str__(self, depth=0):
return self.name
def __repr__(self):
return '<%s %s>' % (self.__class__.__name__, self.name)
class Licenses(object):
def __init__(self, xs):
self.xs = xs
def __iter__(self):
for x in self.xs:
yield x
def flatten(self):
for x in self.xs:
for y in x.flatten():
yield y
def __str__(self, depth=0):
j = ' %s ' % (self._join,)
ss = [x.__str__(depth=depth+1) for x in self.xs]
s = j.join(ss)
if depth > 0:
s = '(%s)' % s
return s
def __repr__(self):
return '<%s %r>' % (self.__class__.__name__, self.xs)
class AllLicenses(Licenses):
_join = 'and'
class AnyLicense(Licenses):
_join = 'or'
def parse_licenses(s):
"""
>>> ls = parse_licenses("X")
>>> ls
<License X>
>>> print ls
X
>>> list(ls)
[<License X>]
>>> list(ls.flatten())
['X']
>>> ls = parse_licenses("X or Y or Z")
>>> ls
<AnyLicense [<License X>, <License Y>, <License Z>]>
>>> print ls
X or Y or Z
>>> list(ls)
[<License X>, <License Y>, <License Z>]
>>> list(ls.flatten())
['X', 'Y', 'Z']
>>> ls = parse_licenses("X and Y and Z")
>>> ls
<AllLicenses [<License X>, <License Y>, <License Z>]>
>>> print ls
X and Y and Z
>>> list(ls)
[<License X>, <License Y>, <License Z>]
>>> list(ls.flatten())
['X', 'Y', 'Z']
>>> print parse_licenses("X or Y and Z")
X or (Y and Z)
>>> print parse_licenses("X and Y or Z")
(X and Y) or Z
>>> print parse_licenses("X, and Y or Z")
X and (Y or Z)
>>> print parse_licenses("X | Y")
X or Y
"""
splits = (
(', and ', AllLicenses),
(' or ', AnyLicense),
(' | ', AnyLicense),
(' and ', AllLicenses))
for (split_str, cls) in splits:
if split_str in s:
return cls([parse_licenses(sub) for sub in s.split(split_str)])
return License(s)
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