def buildGoal(self, e, pos, relation, restriction):
''' create a goal based on a pair of objects or lists of objects
by adding relations to a new goal'''
ori,dst,q = e
if isinstance(ori, basestring): ori = [ori]
if isinstance(dst, basestring): dst = [dst]
g = Goal()
if restriction and (restriction[0] not in ori + dst):
g.addRestriction(restriction[0],restriction[1])
if q == 'any' and "".join(sorted(ori)) == "".join(sorted(dst)):
dst.pop()
for o in ori:
if q == 'any':
n_dst = copy.deepcopy(dst)
nn_dst = copy.deepcopy(n_dst)
for d in n_dst:
if d == o or not Physics().checkPhysicalLaws(o, d, relation, False):
nn_dst.remove(d)
if len(nn_dst) > 0:
g.addRelation(o,nn_dst,pos)
else:
for d in dst:
if d == o or not Physics().checkPhysicalLaws(o, d, relation, False):
return None
g.addRelation(o,d,pos)
if not len(g.relations):
return None
return g
